1. State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences 1 North 2nd Street, Zhongguancun, Haidian District Beijing 100190 P. R. China
2. University of Chinese Academy of Sciences 19A Yuquan Road Beijing 10049 P. R. China
3. Institute of PhysicsChinese Academy of Sciences Beijing 100190 P. R. China