supported by the National Natural Science Foundation of China(30572455,30973400,81071718,81000881);Program for New Century Excellent Talents in University,P.R.China(NCET-06-0685);Department of Science and Technology of Hunan Province,P.R.China(2009WK3060)
supported by National Natural Science Foundation of China(No:30572455,30973400);Program for New Century Excellent Talents in University,NCET(No:NCET-06-0685);Traditional Chinese Medicine Foundation of Hunan(No:2008039);Science and Technology Foundation of Hunan(No:08FJ3176);Science Foundation of Central South University(No:08SDF07)