Nitrosomonas europaea

**Definition:** The type species of the genus NITROSOMONAS, a gram-negative chemolithotroph that oxidizes ammonia to nitrite. It is found in soil, sewage, freshwater, and on building walls, and especially in polluted areas where air contains high levels of nitrogen compounds.

**Tree numbers:** - B03.440.400.425.562.500.200 - B03.660.075.550.500.200