Carbon IsotopesOxygenCarbonIsotopesOxygen IsotopesIsotope LabelingCarbon DioxideOxygen ConsumptionNitrogen IsotopesReactive Oxygen SpeciesMethyl ChlorideAtmosphereFossilsGeologic SedimentsChemical FractionationPaleontologyCarbon MonoxidePhotosynthesisEthylene DichloridesXanthobacterMethaneVolcanic EruptionsPinus taedaPeptococcaceaePlant LeavesOxygen Inhalation TherapyCarbonatesCarbon CycleNanotubes, CarbonCarbon Compounds, InorganicSinglet OxygenEpitestosteronePlant TranspirationFlaveriaRhamnusBiomassEcosystemHistory, AncientMyrtusHyphomicrobiumWaterDoping in SportsNitrogenBiodegradation, EnvironmentalSeawaterOceans and SeasGas Chromatography-Mass SpectrometryZinc IsotopesPlant StomataSoilPhosphoenolpyruvate CarboxylaseSulfur IsotopesFresh WaterRainCarbon Monoxide PoisoningAnaerobiosisExtinction, BiologicalRibulose-Bisphosphate CarboxylaseDeuteriumOxidation-ReductionTimePoaceaeTreesAcetatesIron IsotopesChiropteraPartial PressureClimateHyperbaric OxygenationPlantsSulfatesModels, BiologicalKineticsHydrogen PeroxideAnoxiaGeographyCarbon TetrachlorideStrontium IsotopesOxidative StressBacteriaOximetryCarbon SequestrationRadioisotope Dilution TechniqueAerobiosisSeasonsMass SpectrometryCarbon DisulfideDietCarbon RadioisotopesHydrogen-Ion ConcentrationHemoglobinsBiological EvolutionTime FactorsAntioxidantsFree RadicalsPhylogenyOxyhemoglobinsGlucoseMitochondriaBlood Gas Analysis