Ice CoverGeologic SedimentsIceArctic RegionsRNA, Ribosomal, 16SDNA, RibosomalSaxifragaceaeMummiesGreenlandPhylogenyRiversAntarctic RegionsSnowBacteriaPlanococcaceaeSeawaterCold ClimateFresh WaterDNA, BacterialWater MicrobiologyPoaBiodiversitySequence Analysis, DNAEcosystemSoil MicrobiologyHydrologyGlobal WarmingMolecular Sequence DataWater Pollutants, ChemicalFlavobacteriumGenes, rRNAClimate ChangeAltitudeMarsBase CompositionAlaskaBacterial Typing TechniquesAustriaSoilMethaneHistory, AncientSulfatesFatty AcidsDenaturing Gradient Gel ElectrophoresisBiodegradation, EnvironmentalExtraterrestrial EnvironmentChinaCold TemperatureDeltaproteobacteriaSulfur-Reducing BacteriaArchaeaEstuariesOceans and SeasRNA, BacterialActinomycetalesDNA, ArchaealLakesWater Pollution, ChemicalPacific OceanRhizophoraceaeClimateCluster AnalysisGeographyAnaerobiosisWater PollutantsSeasonsWetlandsUraniumWater PollutionEnvironmental MonitoringTemperatureGeologyEutrophicationBacteria, AnaerobicWater Pollutants, RadioactiveGammaproteobacteriaAroclorsSoil PollutantsWater MovementsPolycyclic Hydrocarbons, AromaticOxidation-ReductionBiotaPetroleumGroundwaterBaysSulfidesPolymorphism, Restriction Fragment LengthHumic SubstancesMarine BiologyCarbonPaleontologyMetals, HeavyCrenarchaeotaForaminiferaProteobacteriaThiotrichaceaePhenotypeGenetic VariationHydrocarbonsChlorophenols