1. Dept. of Food and Nutrition; Kookmin Univ; Seoul 136-702 Korea
2. School of Environmental and Biological Sciences; Rutgers, the State Univ. of New Jersey; New Brunswick NJ 08901 U.S.A
3. Dept. of Biotechnology; College of Life Science and Biotechnology; Yonsei Univ; Seoul 120-479 Korea