General Information: Environment: Fresh water; Isolation: freshwater lake; Temp: Mesophile. Nitrosomonas sp. (strain Is79A3) is an aerobic, chemoautotrophic, Gram-negative bacterium isolated from freshwater lake. It oxidizes ammonia into nitrite. Nitrosomonas sp. are useful in treatment of industrial and sewage waste and in the process of bioremediation.