1. Faculty of Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278, Japan, Institute of Colloid and Interface Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku, Tokyo 162, Japan, Faculty of Engineering, Science University of Tokyo, 1-3, Kagurazaka, Shinjuku, Tokyo 162, Japan, and Elementary & Secondary Education Bureau, The Ministry of Education, Sports and Culture, Kasumigaseki 3-2-2, Chiyoda, Tokyo 100, Japan