1. Faculty of Pharmaceutical Sciences, Hokuriku University, Ho-3 Kanagawa-machi, Kanazawa 920-1181, Japan, Department of Hospital Pharmacy, Toyama Medical and Pharmaceutical University, Toyama 930-0194, Japan, Institute of Grassland and Environmental Research, Aberystwyth, Cardiganshire SY23 3EB, UK, and National Sericulture and Entomology Research Institute, Rural Development Administration, Suwon 441-100, Korea