基金*Supported by the National Natural Science Foundation of China under Grant No 10601031, and the Innovation Program of Shanghai Municipal Education Commission under Grant No 09ZZ183.
基金*Supported in part by the National Natural Science Foundation of China under Grant Nos 10547009 and 10965005, and the Scientific Research Foundation (SRF) for the Returned Overseas Chinese Scholars (ROCS), State Education Ministry.
基金Supported in part by the National Natural Science Foundation of China (10575119), the Knowledge Innovation Project(KJCX3-SYW- N2) of Chinese Academy of Sciences, and the Major State Basic Research Developing Program of China (2007CB815004).