Abstract
1 School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, San 56-1 Shillim-dong, Kwanak-gu, Seoul 151-742, Republic of Korea
2 Safety and Technology Department, Korea Hydro and Nuclear Power Co. Ltd, 167 Samseong-dong, Gangnam-gu, Seoul 135-791, Republic of Korea
3 Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Republic of Korea