Absorptiometry, PhotonBone DensityX-Ray Absorption SpectroscopyFemur NeckBone Diseases, MetabolicLumbar VertebraeAbsorptionIntestinal AbsorptionSpectrum AnalysisSpectrophotometry, AtomicBody CompositionOsteoporosisMagnetic Resonance SpectroscopyX-RaysSpectrometry, X-Ray EmissionEnergy MetabolismSpectrophotometry, InfraredSpectrophotometrySpectrophotometry, UltravioletEnergy TransferElectron Spin Resonance SpectroscopySpectrum Analysis, RamanIronZincSulfurCopperSpectrometry, FluorescenceOxidation-ReductionEnergy IntakeSpectroscopy, Near-InfraredKineticsCircular DichroismWaterModels, MolecularProtein ConformationElectron Probe MicroanalysisElectronsHemeNickelHydrogen-Ion ConcentrationBinding SitesThermodynamicsQuantum TheorySpectroscopy, MossbauerMolecular StructureTemperaturePhotosynthetic Reaction Center Complex ProteinsGamma RaysModels, ChemicalManganeseOrganometallic CompoundsMetalloproteinsManganese CompoundsSolutionsRadiographyPhotochemistryLightSynchrotronsFourier AnalysisAluminumOxygenProtein BindingTime FactorsLasers, SemiconductorPhotolysisFerrous CompoundsX-Ray DiffractionProtonsGraphiteCarbon MonoxideMetalsLigandsMolecular ConformationGoldSelenium CompoundsProtein Structure, SecondaryAdsorptionSpectroscopy, Fourier Transform InfraredLasersPhotosystem I Protein ComplexMolecular Sequence DataPlastocyaninPhotosystem II Protein ComplexOxidesAmino Acid SequenceBacteriorhodopsinsCobaltBiophysicsMolybdenumElectron TransportMyoglobinSkin AbsorptionMetal NanoparticlesCattleOxyhemoglobinsAirBiological AvailabilityNuclear Magnetic Resonance, BiomolecularFerric CompoundsSurface Properties