1. Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Japan;
2. The United Graduate School of Agricultural Sciences, Ehime University, Matsuyama, Japan;
3. Department of Chemistry, Faculty of Science and Technology, Keio University, Kohoku, Japan;
4. Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Japan;
5. Faculty of Education, University of the Ryukyus, Nishihara, Japan