1. Department of Bioapplied Chemistry, Faculty of Engineering; Osaka City University; Sumiyoshi-ku, Osaka Osaka 558 Japan
2. Department of Biophysical Chemistry, Faculty of Engineering; Yokohama National University; Hodogaya-ku, Yokohama Kanagawa 240 Japan
3. Department of Chemistry and Biotechnology, Faculty of Engineering; The University of Tokyo; Bunkyo-ku Tokyo 113 Japan