Schiff BasesBacteriorhodopsinsRetinaldehydeHalobacterium salinarumHalobacteriumSensory RhodopsinsRhodopsinHalorhodopsinsPyridoxal PhosphatePhotochemistryProtonsOctopodiformesSpectrum Analysis, RamanBase PairingBorohydridesBase SequenceRetinal PigmentsHydroxylamineSpectrophotometryPyridoxalNatronobacteriumHydrogen-Ion ConcentrationLightProton PumpsAspartic AcidSpectrophotometry, InfraredKineticsCoordination ComplexesPyridoxamineRhodopsins, MicrobialPurple MembranePeriodic Acid-Schiff ReactionSpectrum AnalysisRetinoidsIsomerismAldehydesSpectroscopy, Fourier Transform InfraredProtein ConformationLysineMolecular StructureModels, MolecularAndropogonBinding SitesSpectrophotometry, UltravioletHydrogen BondingCarotenoidsHydroxylaminesAminesModels, ChemicalThermogravimetryMagnetic Resonance SpectroscopyBiophysical PhenomenaPhotolysisBiophysicsEscherichia coli