Mingji Li, Junshu Wang, Yanping Geng, Yikui Li, Qian Wang, Quanfeng Liang and Qingsheng Qi*
* Corresponding author: Qingsheng Qi qiqingsheng@sdu.edu.cn
Microbial Cell Factories 2012, 11:19 doi:10.1186/1475-2859-11-19