1. School of Bioscience and Biotechnology; Tokyo Univ. of Technology; 1404, Katakura-machi Hachioji Tokyo 192-0982 Japan
2. Dept. of Materials Science and Chemical Engineering, Faculty of Engineering; Shizuoka Univ; 3-5-1, Johoku, Naka-ku Hamamatsu Shizuoka 432-8561 Japan