1. Laboratory of Applied Microbiology, Department of Microbial Biotechnology, Graduate School of Agricultural Science, Tohoku University, Tsutsumi-dori Amamiya-machi 1-1, Aoba-ku, Sendai 981-8555, Japan
2. Research Institute of Environmental and Disaster-Prevention Engineering, Tohoku Gakuin University, 1-13-1, Tagajo 985-0873, Japan