1. Department of Applied Chemistry, Muroran Institute of Technology, Mizumoto, Muroran 050-8585
2. Fisheries Research Agency, Fukuura, Kanazawa, Yokohama 236-8648
3. Department of Science and Technology, Keio University, Hiyoshi, Kohoku, Yokohama 223-8522
4. National Institute of Advanced Industrial Science and Technology, Tsukizamu, Toyohira, Sapporo 062-8517, Japan