MolybdenumNuclear ReactorsAir Pollution, RadioactiveNuclear FissionRadioactive Hazard ReleaseSoil Pollutants, RadioactiveCesium RadioisotopesUkraineIsotopesPteridinesIsotope LabelingCoenzymesBioreactorsMetalloproteinsTungstenOxygen IsotopesNitrogen IsotopesCarbon IsotopesXanthine DehydrogenaseNitrate ReductasesAldehyde OxidaseNitrate ReductaseSulfite OxidasePterinsSulfurtransferasesXanthine OxidaseSewageWaste Disposal, FluidTungsten CompoundsOxidoreductases Acting on Sulfur Group DonorsNitrogenaseSulfurSulfur IsotopesEnzymes, ImmobilizedNitrate Reductase (NADH)Zinc IsotopesAnaerobiosisAldehyde OxidoreductasesWater PurificationDeuteriumMolybdoferredoxinOxidation-ReductionOxidoreductasesElectron Spin Resonance SpectroscopyMethaneRhodobacter capsulatusIndustrial WasteIron IsotopesBiodegradation, EnvironmentalRefuse DisposalWaste WaterMetal Metabolism, Inborn ErrorsFormate DehydrogenasesNitrobacterIron-Sulfur ProteinsChloratesMethanosarcinaceaeKineticsNitrificationAzotobacter vinelandiiXanthineSulfidesNitrogenStrontium IsotopesBacteriaNitratesAzotobacterBiological Oxygen Demand AnalysisMolecular Sequence DataAmmoniaSulfite DehydrogenaseMethanobacteriumRNA, Ribosomal, 16SCatalysisEuryarchaeotaWaste ManagementBiomassEscherichia coliMethanosarcinalesNitrogen FixationBiofuelsRadionuclide GeneratorsAmmonium CompoundsHydrogen-Ion ConcentrationNitrosomonasMass SpectrometryHydrogenOrganometallic CompoundsDesulfovibrio gigasCells, ImmobilizedRadioisotope Dilution TechniqueBacteria, AnaerobicDithioniteCarbonSpectrophotometryFormatesDenitrificationPentachlorophenolMetalloexopeptidasesTracheobionta