Carbon IsotopesCarbonIsotopesIsotope LabelingOxygen IsotopesCarbon DioxideNitrogen IsotopesMethyl ChlorideAtmosphereFossilsGeologic SedimentsChemical FractionationEthylene DichloridesPaleontologyXanthobacterVolcanic EruptionsPinus taedaPhotosynthesisMethanePeptococcaceaeCarbon MonoxidePlant LeavesCarbonatesCarbon CycleNanotubes, CarbonPlant TranspirationCarbon Compounds, InorganicEpitestosteroneFlaveriaRhamnusEcosystemBiomassHistory, AncientMyrtusHyphomicrobiumWaterDoping in SportsDeuteriumSeawaterBiodegradation, EnvironmentalNitrogenOceans and SeasZinc IsotopesPlant StomataGas Chromatography-Mass SpectrometrySoilPhosphoenolpyruvate CarboxylaseRainSulfur IsotopesExtinction, BiologicalFresh WaterRibulose-Bisphosphate CarboxylaseCarbon Monoxide PoisoningPoaceaeTreesTimeDeuterium Exchange MeasurementIron IsotopesChiropteraAcetatesClimatePulmonary Gas ExchangeKineticsPlantsSulfatesHydrogenExchange Transfusion, Whole BloodGeographyStrontium IsotopesBacteriaSister Chromatid ExchangeCarbon TetrachlorideAnaerobiosisModels, BiologicalRadioisotope Dilution TechniqueCarbon SequestrationMass SpectrometryHydrogen-Ion ConcentrationCarbon DisulfideSeasonsCarbon RadioisotopesDietBiological EvolutionPhylogenyMolecular Sequence DataMagnetic Resonance SpectroscopyIndicator Dilution TechniquesCarbon Tetrachloride PoisoningOxidation-ReductionOxygenChromatography, Ion ExchangeSodium-Hydrogen AntiporterTemperatureAmino Acid SequenceProtonsCatalysisSodiumIon Exchange ResinsCarbon FootprintRho Guanine Nucleotide Exchange Factors