Carbon IsotopesCarbonIsotopesIsotope LabelingOxygen IsotopesChemical FractionationNitrogen IsotopesCarbon DioxideMethyl ChlorideAtmosphereGeologic SedimentsFossilsEthylene DichloridesXanthobacterPaleontologyVolcanic EruptionsMethanePinus taedaPhotosynthesisPeptococcaceaePlant LeavesCell FractionationCarbonatesCarbon MonoxideCarbon CycleCarbon Compounds, InorganicNanotubes, CarbonEpitestosteronePlant TranspirationFlaveriaRhamnusBiomassEcosystemHyphomicrobiumHistory, AncientMyrtusDoping in SportsSulfur IsotopesBiodegradation, EnvironmentalSeawaterGas Chromatography-Mass SpectrometryZinc IsotopesNitrogenWaterOceans and SeasPhosphoenolpyruvate CarboxylaseSoilPlant StomataRainDeuteriumFresh WaterExtinction, BiologicalRibulose-Bisphosphate CarboxylaseIron IsotopesCarbon Monoxide PoisoningPoaceaeTreesTimeChiropteraAcetatesClimateFractionation, Field FlowPlantsSulfatesSubcellular FractionsBacteriaGeographyAnaerobiosisStrontium IsotopesCarbon TetrachlorideKineticsMass SpectrometryCarbon SequestrationRadioisotope Dilution TechniqueCarbon DisulfideCarbon RadioisotopesModels, BiologicalSeasonsDietMolecular Sequence DataHydrogen-Ion ConcentrationBiological EvolutionPhylogenyMolecular WeightIndicator Dilution TechniquesCarbon Tetrachloride PoisoningOxidation-ReductionHydrogenAmino AcidsAmino Acid SequenceElectrophoresis, Polyacrylamide GelChromatography, LiquidChromatography, GelChromatographyChemistry Techniques, AnalyticalChromatography, Ion ExchangeTemperatureLiverProteomicsMagnetic Resonance Spectroscopy