Nitrogen CycleSoilNitrogenFertilizersBiomassSoil MicrobiologyCarbonEcosystemNitrogen CompoundsNitrogen FixationNitrificationDenitrificationSoil PollutantsCell CyclePlanctomycetalesQuaternary Ammonium CompoundsNitrogen IsotopesCrenarchaeotaArchaeaCarbon DioxideAmmoniaBacteriaNitrite ReductasesNitratesCarbon MonoxideTreesNitritesSeawaterPhylogenyNanotubes, CarbonAgricultureGeologic SedimentsOceans and SeasGenes, ArchaealNitrous OxideDNA, ArchaealOxidation-ReductionClimate ChangeRNA, Ribosomal, 16SBiodiversityMolecular Sequence DataNitrogen DioxideBlood Urea NitrogenCarbon IsotopesOxidoreductasesMenstrual CycleSequence Analysis, DNACarbon Monoxide PoisoningReactive Nitrogen SpeciesBiodegradation, EnvironmentalCarbon SequestrationPlant RootsSoil Pollutants, RadioactiveGenome, BacterialCell Cycle ProteinsNitrogen OxidesPII Nitrogen Regulatory ProteinsCarbon TetrachlorideCitric Acid Cycle