1. Department of Pharmacology, School of Medicine and Institute of Health Sciences, Gyeongsang National University, Jinju, Korea
2. Department of Agronomy, Research Institute of Life Science, Gyeongsang National University, Jinju, Korea
3. Department of Chemistry, Research Institute of Life Science, Gyeongsang National University, Jinju, Korea
4. Department of Biotechnology, Dong-A University, Busan 604-714, South Korea