1. National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho, Nagoya, Aichi 467-8603, Japan, and Faculty of Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan