国家自然科学基金10674047,10804031,10904037,10974055,11034002,11274114;国家重点基础研究发展计划2006CB921604,2011CB921602;上海市基础重点项目07JC14017;上海市重点学科建设项目批准号:B408资助的课题.* Project supported by the National Natural Science Foundation of ChinaGrant .10674047,10804031,10904037,10974055,11034002,11274114;the National Basic Research Program of ChinaGrant .2006CB921604,2011CB921602;the Basic Key Program of Shanghai Municipality, ChinaGrant 07JC14017;the Shanghai Leading Academic Discipline Project, ChinaGrant B408