1. College of Biotechnology, Tianjin University of Science & Technology, Tianjin, P. R. China
2. Key Laboratory of Industrial Fermentation Microbiology, Tianjin University of Science & Technology, Ministry of Education, Tianjin, P. R. China
3. Tianjin Key Laboratory of Industrial Microbiology, Tianjin University of Science & Technology, Tianjin, P. R. China