NitritesNitrite ReductasesNitratesSodium NitriteNitrite Reductase (NAD(P)H)Oxidation-ReductionNitrate ReductasesNitrosomonas europaeaParacoccus pantotrophusNitric OxideNitrate ReductaseAnaerobiosisVeillonellaNitrous OxideMolybdenumXanthine OxidaseOxygenHemoglobinsQuaternary Ammonium CompoundsHemePseudomonasCytochromesAmyl NitriteElectron TransportElectron Spin Resonance SpectroscopyLuminescent MeasurementsHydrogen-Ion ConcentrationOxidoreductasesElectrochemistryEscherichia coliKineticsMolecular Sequence DataNitrobacterNitric Oxide SynthaseMethemoglobinFerredoxin-Nitrite ReductaseNitroso Compounds