1. Research Institute of Natural Sciences, Okayama University of Science, Ridai-cho, Kita-ku, Okayama 700-0005
2. Department of Chemistry, Okayama University of Science, Ridai-cho, Kita-ku, Okayama 700-0005
3. Department of Foreign Studies, Kibi International University, Okuda-Nishimachi, Kita-ku, Okayama 700-0931