BacteriorhodopsinsHalobacterium salinarumHalobacteriumPhotochemistryPurple MembraneSchiff BasesRetinaldehydeLightProtonsCarotenoidsProton PumpsHalorhodopsinsSpectroscopy, Fourier Transform InfraredBiophysical PhenomenaBiophysicsSpectrophotometryPhotoreceptors, MicrobialKineticsSpectrophotometry, InfraredNatronobacteriumHydrogen-Ion ConcentrationAspartic AcidProtein ConformationSensory RhodopsinsHalorhodospira halophilaPhotobiologyThermodynamicsRhodopsins, MicrobialWaterSpectrum AnalysisIsomerismDarknessPhotolysisSpectrum Analysis, RamanChromatiaceaeRhodopsinModels, MolecularElectrochemistryFourier AnalysisIon PumpsArchaeal ProteinsModels, ChemicalProtein Structure, SecondaryCrystallographyAsparagineLasersTemperatureHydrogen BondingThioglucosidesBacillalesMutagenesis, Site-DirectedPhotochemical ProcessesX-Ray DiffractionDeuterium OxideEnergy TransferAmino Acid SequenceNeutronsRetinoidsMotionTime FactorsProteolipidsMutationCrystallography, X-RayElectronsStructure-Activity RelationshipMathematicsDimyristoylphosphatidylcholineDetergentsSpectrophotometry, UltravioletMolecular StructureBacterial ProteinsPhycobiliproteinsPoint MutationBinding Sites