1. School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, China
2. School of Biology and Environmental Engineering, Xi'an University, Xi'an, China
3. Shaaxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, China
4. Engineering Center for Pollution Control and Ecological Restoration in Mining of Gansu Province, Lanzhou City University, Lanzhou, China