1. Graduate School of Engineering, Hokkaido University, Hokkaido 060-8628, Japan
2. Graduate School of Sciences, Hokkaido University, Hokkaido 060-0810, Japan
3. Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
4. Department of Bioresource Engineering, Yamagata University, Yamagata 997-8555, Japan