1. a Department of Industrial Chemistry, Seikei University, Musashino, Tokyo 180-8633, Japan
2. b Department of Industrial Chemistry, Seikei University, Musashino, Tokyo 180-8633, Japan
3. c Department of Industrial Chemistry, Seikei University, Musashino, Tokyo 180-8633, Japan
4. d Department of Industrial Chemistry, Seikei University, Musashino, Tokyo 180-8633, Japan
5. e Department of Polymer Engineering, Chonnam National University, Kwangju 500-757, Korea
6. f Department of Biomolecular Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa 227, Japan
7. g Department of Industrial Chemistry, Seikei University, Musashino, Tokyo 180-8633, Japan