Prokaryotic CellsArchaeaBacteriaEscherichia coliBacterial ProteinsMolecular Sequence DataEukaryotic CellsAmino Acid SequenceEscherichia coli ProteinsDNA, BacterialGenome, ArchaealGenes, ArchaealBase SequenceArchaeal ProteinsPhylogenyCytoskeletal ProteinsDNA, ArchaealGram-Negative BacteriaRNA, ArchaealGram-Positive BacteriaRNA, Ribosomal, 16SCell MembraneCell DivisionBacteria, AnaerobicGenome, BacterialCrenarchaeotaSequence Analysis, DNADNA, RibosomalGene Expression Regulation, ArchaealMethaneHaloferax volcaniiSeawaterGenes, BacterialSequence AlignmentSequence Homology, Amino AcidWater MicrobiologyBacterial Physiological PhenomenaEvolution, MolecularMethanococcusBacteria, AerobicRNA, BacterialGeologic SedimentsSulfolobusGene Transfer, HorizontalSoil MicrobiologyEuryarchaeotaCloning, MolecularSpecies SpecificityEukaryotaGene Expression Regulation, BacterialGenes, rRNAProkaryotic Initiation FactorsMethanobacteriaceaeBase CompositionMethanosarcinaModels, MolecularAnaerobiosisNitrificationSulfur-Reducing BacteriaProteobacteriaGram-Negative Anaerobic BacteriaSymbiosisBiodiversityChromosomes, ArchaealProtein Structure, TertiaryAnti-Bacterial AgentsPyrococcusPlasmidsColony Count, MicrobialGram-Negative Aerobic BacteriaMethanobacteriumCulture MediaFresh WaterSulfolobus acidocaldariusGenomicsMethanosarcinalesDesulfurococcaceaeAmmoniaHalobacterialesOxidation-ReductionConserved SequenceSulfolobus solfataricusEcosystemHaloferaxPyrococcus furiosusTemperatureOxidoreductasesOperonCrystallography, X-RayMutationMethanosarcinaceaeBinding SitesArchaeoglobus fulgidusOpen Reading FramesPyrococcus abyssiGammaproteobacteriaRecombinant ProteinsSubstrate SpecificityArchaeal VirusesHeterotrophic Processes