1. Department of Chemistry, Faculty of Medicine, Oita University, 1–1 Hasama-machi, Oita 879–5593, Japan
2. Department of Life Science, Faculty of Science, Okayama University of Science, 1–1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
3. Department of Physics, Faculty of Medicine, Oita University, 1–1 Hasama-machi, Oita 879–5593, Japan