Isotope LabelingOxygenIsotopesOxygen IsotopesNitrogen IsotopesCarbon IsotopesOxygen ConsumptionReactive Oxygen SpeciesZinc IsotopesSulfur IsotopesDeuteriumOxygen Inhalation TherapyIron IsotopesSinglet OxygenStrontium IsotopesRadioisotope Dilution TechniqueOxidation-ReductionMass SpectrometryKinetics