1. CAS Key Laboratory of Environmental and Applied Microbiology and Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, P.R. China
2. School of Basic Medical Science, Chengdu Medical College, Chengdu 610083, P.R. China
3. Department of Biosystems Engineering, Auburn University, Auburn, Alabama, Alabama 36849, USA
4. Faculty of Bioengineering, Sichuan University of Science and Engineering, Xueyuan Street 180#, Huixing Rd. Zigong 643000, P.R. China