1. ; School of Allied Medical Sciences; Shinshu University; Matsumoto 390 Japan
2. ; Suwa Hydrobiological Station; Shinshu University; Suwa 392 Japan
3. Sagami Chemical Research Center; Nishi-Ohnuma 4-4-1 Sagamihara 229 Japan
4. ; Department of Microbiology, School of Medicine; Gifu University; Gifu 500 Japan
5. ; Division of Environmental Biology; National Institute for Environmental Studies; Onogawa 16-2 Tsukuba 305 Japan
6. ; Department of Environmental Engineering; Toyama Prefectural University; Toyama 939-03 Japan
7. ; Department of Marine Science and Technology; Tokyo University of Fisheries; Tokyo 108 Japan
8. ; Botany Department; University of Tokyo; Hongo Tokyo 113 Japan