GroundwaterNebraskaNitratesNitritesNitrogen CompoundsFertilizersNitrate ReductaseWater Pollutants, ChemicalWater SupplySoilMethemoglobinemiaFresh WaterNitrogenAnion Transport ProteinsAgricultureMethemoglobinEnvironmental MonitoringNitric OxidePlant RootsWater Pollution, ChemicalNitric Oxide SynthaseWater MicrobiologyWater PollutantsWater PollutionUraniumBiodegradation, EnvironmentalArsenicWater WellsWater Pollutants, RadioactiveWater MovementsNitrate Reductase (NADH)TrichloroethyleneDrinking WaterSilver NitrateRadioactive WasteWater PurificationSoil PollutantsGeologyEnvironmental RemediationGeologic SedimentsGeological PhenomenaTetrachloroethyleneBangladeshManureArsenic PoisoningHydrologyGeobacterRNA, Ribosomal, 16SWater Pollution, RadioactiveBacteriaChloroflexiRefuse DisposalNitrate Reductase (NAD(P)H)Agricultural IrrigationRivers