1. Institute of Biotechnology; National Dong-Hwa University; Hualien 97401 Taiwan
2. Institute of Biotechnology & Department of Life Science; National Tsing Hua University; Hsinchu 30013 Taiwan
3. Department of Food Science & Technology; Tajen University; Ping Tung Hsien Taiwan
4. Department of Agrobioscience; Graduate School of Agricultural Science; Kobe University; Nada-ku Kobe 657-8501 Japan