1. School of Environmental Science and Engineering; Kochi University of Technology; Kami, Kochi 782-8502 Japan,
2. Research Center for Material Science and Engineering; Kochi University of Technology; Kami, Kochi 782-8502 Japan
3. Marketing & Development Department; Ihara Chemical Industry Co., Ltd.; Fujikawa-cho, Ihara-gun, Shizuoka 421-3306 Japan