Spin LabelsElectron Spin Resonance SpectroscopySpin TrappingMicroscopy, ElectronElectronsElectron TransportMicroscopy, Electron, ScanningMicroscopy, Electron, TransmissionCyclic N-OxidesOxidation-ReductionNitrogen OxidesFree RadicalsMicroscopy, Electron, Scanning TransmissionElectron Probe MicroanalysisModels, MolecularElectron Transport Complex IVKineticsProtein ConformationElectron Transport Complex IIIHemeSpectrophotometryTriacetoneamine-N-OxylMagnetic Resonance SpectroscopyHydroxyl RadicalOxygenModels, ChemicalMagneticsTemperatureIronSpectrum AnalysisCytochrome c GroupHydroxidesOxidoreductasesQuantum TheoryCytochromesFerredoxinsCryoelectron MicroscopyPhotosynthetic Reaction Center Complex ProteinsMolecular Sequence DataHydrogen-Ion ConcentrationIron-Sulfur ProteinsElectron Transport Chain Complex ProteinsPhotosynthesisSpectroscopy, MossbauerFerric CompoundsWaterBinding SitesCell MembraneProtonsMolecular StructureHydrogenMolecular ConformationFerricyanidesMicroscopy, ImmunoelectronProtein BindingCattleEscherichia coliAmino Acid SequenceThermodynamicsElectron Transport Complex IBacterial ProteinsCopperMitochondriaUbiquinoneElectrochemistryLightChlorophyllCyanidesPhotosystem II Protein ComplexRhodobacter sphaeroidesMicrowavesPhotosystem I Protein ComplexTime FactorsSpectrum Analysis, RamanRabbitsSuperoxidesMathematicsCytochrome b GroupHydrogen PeroxideMagnetic Resonance ImagingQuinonesFreeze FracturingFreezingCrystallography, X-RayX-Ray DiffractionFlavinsFerrocyanidesImage Processing, Computer-AssistedFerrous CompoundsSulfurMutationStaining and LabelingDithioniteElectron-Transferring FlavoproteinsMethemoglobinHistocytochemistryHorseradish PeroxidaseProtein Structure, SecondaryMetalloproteinsNADP