#nitrobacterium  any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates
  supertype:  bacteria__bacterium  single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered plants
  subtype:  nitrate_bacterium__nitratebacterium__nitric_bacterium  any of the nitrobacteria that oxidize nitrites into nitrates
  subtype:  nitrite_bacterium__nitritebacterium__nitrous_bacterium__nitrousbacterium  any of the nitrobacteria that oxidize ammonia into nitrites

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