Carbon IsotopesCarbonOxygenIsotopesOxygen IsotopesIsotope LabelingCarbon DioxideNitrogen IsotopesMethyl ChlorideAtmosphereFossilsGeologic SedimentsOxygen ConsumptionChemical FractionationPaleontologyEthylene DichloridesXanthobacterVolcanic EruptionsPhotosynthesisPinus taedaMethaneReactive Oxygen SpeciesCarbon MonoxidePeptococcaceaePlant LeavesCarbonatesCarbon CycleNanotubes, CarbonCarbon Compounds, InorganicEpitestosteronePlant TranspirationFlaveriaRhamnusEcosystemBiomassHistory, AncientMyrtusHyphomicrobiumDoping in SportsSeawaterBiodegradation, EnvironmentalWaterNitrogenOceans and SeasZinc IsotopesGas Chromatography-Mass SpectrometryPlant StomataSoilPhosphoenolpyruvate CarboxylaseSulfur IsotopesRainFresh WaterExtinction, BiologicalCarbon Monoxide PoisoningRibulose-Bisphosphate CarboxylaseDeuteriumPoaceaeTimeOxygen Inhalation TherapyTreesIron IsotopesChiropteraAcetatesClimateSinglet OxygenAnaerobiosisPlantsSulfatesGeographyCarbon TetrachlorideStrontium IsotopesOxidation-ReductionBacteriaCarbon SequestrationModels, BiologicalRadioisotope Dilution TechniqueKineticsCarbon DisulfideSeasonsDietMass SpectrometryCarbon RadioisotopesPartial PressureBiological EvolutionPhylogenyHyperbaric OxygenationCarbon Tetrachloride PoisoningIndicator Dilution TechniquesHydrogenHydrogen-Ion ConcentrationGlucoseHydrogen PeroxideAnoxiaAerobiosisOxidative StressTime FactorsCarbon FootprintOximetryEvolution, PlanetaryMagnetic Resonance Spectroscopy