X-Ray Absorption SpectroscopyAbsorptionIntestinal AbsorptionSpectrum AnalysisSpectrophotometry, AtomicMagnetic Resonance SpectroscopyX-RaysSpectrometry, X-Ray EmissionSpectrophotometry, InfraredSpectrophotometrySpectrophotometry, UltravioletElectron Spin Resonance SpectroscopySpectrum Analysis, RamanIronZincSulfurCopperSpectroscopy, Near-InfraredSpectrometry, FluorescenceOxidation-ReductionCircular DichroismKineticsWaterHemeModels, MolecularProtein ConformationElectronsNickelSpectroscopy, MossbauerManganeseMetalloproteinsOrganometallic CompoundsManganese CompoundsPhotosynthetic Reaction Center Complex ProteinsHydrogen-Ion ConcentrationMolecular StructureBinding SitesQuantum TheoryPhotochemistryFourier AnalysisSolutionsAluminumSynchrotronsTemperatureLightModels, ChemicalLasers, SemiconductorPhotolysisFerrous CompoundsGraphiteOxygenCarbon MonoxideMetalsEnergy TransferSelenium CompoundsProtein BindingGoldPlastocyaninAdsorptionProtonsSpectroscopy, Fourier Transform InfraredLigandsPhotosystem I Protein ComplexOxidesThermodynamicsMolecular ConformationProtein Structure, SecondaryLasersCobaltMolybdenumPhotosystem II Protein ComplexBacteriorhodopsinsSkin AbsorptionMyoglobinX-Ray DiffractionMetal NanoparticlesOxyhemoglobinsBiological AvailabilityAirFerric CompoundsNuclear Magnetic Resonance, BiomolecularElectron TransportBiophysicsMolecular Sequence DataAmino Acid SequenceTime FactorsCadmium CompoundsRhodobacter sphaeroidesCytochromes c6RetinaldehydeVanadium CompoundsSurface PropertiesNonheme Iron ProteinsScattering, RadiationCattleSpinacia oleraceaSelenic AcidHistidineElectrochemistryElectron Probe Microanalysis