1. Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
2. Department of Physics, Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
3. Department of Food and Nutrition, Faculty of Human Life Sciences, Senri Kinran University, Suita, Osaka 565-0873, Japan