1. Faculty of Science and Technology, Science University of Tokyo, Yamazaki 2641 Noda, Chiba 278, Japan, Institute of Colloid and Interface Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku, Tokyo 162, Japan, Faculty of Household Sciences, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558, Japan, Department of Chemical Engineering, Nara Technical College, 22 Yada, Yamatokoriyama, Nara 639-11, Japan, and Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand