1. Central Research Institute of Electric Power Industry, Department of Bioscience, 1646 Abiko, Abiko-city, Chiba Japan 270-11, Sapidyne Instruments Inc., PMB#445, 967 East ParkCenter Boulevard, Boise ID 83706-6700, and Tokyo Denki University, 2-2 Nishiki-machi, Kanda, Chiyoda-ku, Tokyo Japan 101-8457