Free RadicalsSuperoxidesSuperoxide DismutaseFree Radical ScavengersHydroxyl RadicalElectron Spin Resonance SpectroscopyAntioxidantsOxidative StressCatalaseOxidation-ReductionHydrogen PeroxideReactive Oxygen SpeciesXanthine OxidaseLipid PeroxidationPicratesHydroxidesCyclic N-OxidesNitrogen OxidesSpin LabelsOxygenSpin TrappingMalondialdehydeNADPH OxidaseAscorbic AcidLipid PeroxidesGlutathione PeroxidaseNitric OxideGlutathioneParaquatOxidantsPlant ExtractsXanthineBiphenyl CompoundsCopperIronThiobarbituric Acid Reactive SubstancesNeutrophilsKineticsDeferoxamineDitiocarbVitamin ERats, WistarPeroxynitrous AcidAntipyrineLuminescent MeasurementsMitochondriaPeroxidesRats, Sprague-DawleyProstatectomyNitroblue TetrazoliumPulse RadiolysisCells, CulturedMetalloporphyrinsTioproninNitratesTime FactorsPyrogallolDose-Response Relationship, DrugPeroxidasesHypoxanthineAllopurinolPhenolsManganeseAmidinesNitric Oxide SynthaseNADH, NADPH OxidoreductasesPeroxidaseEndothelium, Vascular1,2-Dihydroxybenzene-3,5-Disulfonic Acid Disodium SaltSulfhydryl CompoundsSulfonic AcidsEnzyme InhibitorsCell SurvivalMolecular StructureTyrosineOxygen ConsumptionModels, ChemicalRibonucleotide ReductasesReactive Nitrogen SpeciesDNA DamageFerrous CompoundsAcetophenonesRespiratory BurstNADPHorseradish PeroxidaseAcetylcysteineReperfusion InjuryChromatography, High Pressure LiquidLiverMethemoglobinFerric Compoundstert-ButylhydroperoxideCattleChelating AgentsSpectrophotometryBenzothiazolesHydrazinesGlutathione ReductaseThioureaThiobarbiturates