学习记忆的分子神经机制（徐林）知识库

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	Both stress experience and age determine the impairment or enhancement effect of stress on spatial memory retrieval
	Yang Y1; Cao J1; Yang S1; Xu L*1; Wei H2; Deng J3; Li T3; Xiong W1; Zhang J1; Zhou Q1; lxu@vip.163.com
	2003
发表期刊	JOURNAL OF ENDOCRINOLOGY
卷号	178期号:1页码:45-54
摘要	It has been documented that stress or glucocorticoids have conflicting effects on memory under different conditions. However, it is not fully understood why stress can either impair or enhance memory. Here, we have examined the performance of six age groups of Wistar rats in a water maze spatial task to evaluate the effects of stress under different conditions. We found that the impairment or enhancement effect of an 'elevated platform' (EP) stress on memory was dependent on previous stress experience and on age. EP stress impaired memory retrieval in water maze naive animals. but enhanced rather than impaired memory retrieval in young water maze stress-experienced animals. Furthermore, exogenously applied corticosterone or foot shock stress before water maze training prevented the impairment of memory retrieval that should be induced by treatment with corticosterone or foot shock before the 'probe trial'. Again, memory retrieval was enhanced in young animals under these conditions, and this enhancement can be prevented by the glucocorticoid receptor antagonist RU 38486. Thus, glucocorticoid receptor activation not only induced impairment of memory but also increased the capacity of young animals to overcome a later stress. The present findings suggest that the effect of stress on memory can be switched from impairment to enhancement dependent on both stress experience and age.
资助者	National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work.
收录类别	SCI
语种	英语
资助者	National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work. ; National Basic Research Program G1999054000, National Natural Science grants 39870280, 39925011, 39930080 and Yunnan Science Foundation grant 98C111 M of China to L X supported this work.
文献类型	期刊论文
条目标识符	http://ir.kiz.ac.cn/handle/152453/10906
专题	科研部门_学习记忆的分子神经机制（徐林）
通讯作者	lxu@vip.163.com
作者单位	1.Laboratory of Learning and Memory, Kunming Institute of Zoology, The Chinese Academy of Science, Kunming, 650223, Republic of China 2.Kunming General Hospital, ChengDu area, Kunming, Republic of China 3.Yunnan Institute of Agriculture, Kunming, Republic of China
推荐引用方式 GB/T 7714	Yang Y,Cao J,Yang S,et al. Both stress experience and age determine the impairment or enhancement effect of stress on spatial memory retrieval[J]. JOURNAL OF ENDOCRINOLOGY,2003,178(1):45-54.
APA	Yang Y.,Cao J.,Yang S.,Xu L*.,Wei H.,...&lxu@vip.163.com.(2003).Both stress experience and age determine the impairment or enhancement effect of stress on spatial memory retrieval.JOURNAL OF ENDOCRINOLOGY,178(1),45-54.
MLA	Yang Y,et al."Both stress experience and age determine the impairment or enhancement effect of stress on spatial memory retrieval".JOURNAL OF ENDOCRINOLOGY 178.1(2003):45-54.

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