title: Nitrification in natural streams.
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D005843:Geography; D008433:Mathematics; D008962:Models, Theoretical; D009566:Nitrates / Q000378:metabolism*; D009573:Nitrites / Q000378:metabolism*; D010084:Oxidation-Reduction
chemical_list: D009566:Nitrates; D009573:Nitrites; D000641:Ammonia