1. College of Life Science and Engineering, Northwest Minzu University, Lanzhou, Gansu, P. R. China
2. Hospital of Medicine College, Northwest Minzu University, Lanzhou, Gansu, P. R. China
3. State Engineering Technology Institute for Karst Desertification Control, Guizhou Normal University, Guiyang, Guizhou, P. R. China
4. School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, P. R. China