1. Dep. of Renewable Resources; Univ. of Louisiana; Lafayette LA 70504
2. National Inst. of Agric. Sci. & Technology; 249 Seodun-dong Suwon Korea
3. Div. of Environ. Sci. and Ecological Eng.; College of Life and Environ. Sciences, Korea Univ.; 1,5-Ka, Anam-dong Sungbuk-ku Seoul Korea