Magnetic Resonance SpectroscopySpectrum AnalysisSpectroscopy, Near-InfraredElectron Spin Resonance SpectroscopySpectrum Analysis, RamanSpectrophotometry, InfraredNuclear Magnetic Resonance, BiomolecularSpectrometry, FluorescenceX-Ray Absorption SpectroscopyCircular DichroismCreatinePhotoelectron SpectroscopySpectroscopy, MossbauerModels, MolecularProtonsProtein ConformationProtein Structure, SecondaryAspartic AcidSpectrophotometry, UltravioletCholineSolutionsMolecular StructureMolecular Sequence DataSpectrometry, X-Ray EmissionSpectrophotometryPhosphocreatineMolecular ConformationHydrogen-Ion ConcentrationKineticsWater