Nitrogen CycleNitrogen FixationNitrogenNitrogen CompoundsQuaternary Ammonium CompoundsNitrificationDenitrificationAmmoniaArchaeaCell CyclePlanctomycetalesPII Nitrogen Regulatory ProteinsNitrogen IsotopesCrenarchaeotaOxidation-ReductionNitrite ReductasesNitratesNitritesGene Expression Regulation, BacterialSeawaterGenes, ArchaealMolecular Sequence DataOceans and SeasBacteriaCyanobacteriaNitrous OxideEcosystemDNA, ArchaealSoil MicrobiologyGeologic SedimentsBacterial ProteinsSoilClimate ChangePhylogenyAgricultureBlood Urea NitrogenNitrogen Dioxide