1. Environmental Toxicology Division, Toxicological Research Center, Hoseo University, 165 Sechul, Baebang, Asan, Chungnam 336-795, Korea
2. Department of Molecular Biotechnology, College of Life and Environmental Sciences, Konkuk University, 1 Hwayang-dong, Gwanjin-gu, Seoul 143-701, Korea
3. Agrochemical Research Center, LG Chem Investment, Daejeon 305-380, Korea
4. Department of Agricultural Biotechnology, Seoul National University, Seoul 151-952, Korea
5. Environmental Toxicology Division, Analytical Research Center, Korea Institute of Toxicology, 100 Jang-dong, Yuseong, Daejeon 305-343, Korea