4) Collins, M.D and Jones, D. (1981) Distribution of isoprenoid quinone structural types in bacteria and their taxonomic implications, Microbiological Review, 45, 316-354.
5) Furumai, H., Kawasaki, T., Futawatari, T. and Kusuda, T. (1988) Effect of salinity on nitrification in atidal river, Water Science and Technology, 20, 165-174.