1. a Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda-shi, Chiba 278, Japan
2. b Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda-shi, Chiba 278, Japan
3. c Research Institute for Biosciences, Science University of Tokyo, 2669 Yamazaki, Noda-shi, Chiba 278, Japan