1. Department of Physical Chemistry, Kyoto Pharmaceutical University, Yamashina, Kyoto 607, Japan, Faculty of Bioscience and Biotechnology, Department of Life Sciences, Tokyo Institute of Technology, Midori-ku, Yokohama 226, Japan, Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, Tokushima 770, Japan, and Department of Physicochemical Physiology, Medical School, Osaka University, Suita, Osaka 565, Japan