DeltaproteobacteriaSulfur-Reducing BacteriaSulfatesHydrogensulfite ReductaseDenitrificationDesulfovibrioGeologic SedimentsProteobacteriaRNA, Ribosomal, 16SOxidation-ReductionFerric CompoundsGeobacterChewing GumGroundwaterAnaerobiosisWater MicrobiologySulfidesPhylogenyNitratesArchaeaDesulfovibrio vulgarisSeawaterChromatesMethaneUraniumBacteriaPetroleumArchaeoglobus fulgidusNitrate ReductaseDNA, RibosomalDNA, BacterialSoil MicrobiologyBiodegradation, EnvironmentalSequence Analysis, DNABacterial Physiological PhenomenaAcetatesMolecular Sequence DataBiodiversityBacteria, AnaerobicFresh WaterActinobacteriaHydrogenGenes, rRNAEcosystemRNA, BacterialCulture MediaBacterial ProteinsBase Sequence