Photochemical ProcessesLightPhotochemistryQuantum TheoryEnergy TransferSpectrometry, FluorescenceElectronsChlorophyllHalorhodospira halophilaPhotosynthetic Reaction Center Complex ProteinsLight-Harvesting Protein ComplexesPheophytinsPhotoreceptors, MicrobialSpectrum AnalysisBiophysical PhenomenaLuminescence2-NaphthylamineBiophysicsFluorescenceBacteriochlorophyllsSpectrophotometryProtonsLauratesAbsorptionSchiff BasesPhotolysisIsomerismModels, ChemicalSpinacia oleraceaModels, MolecularElectron TransportPhotonsRetinaldehydeMolecular StructureRutheniumKineticsPhotosystem II Protein ComplexRhodobacter sphaeroidesLasersFluorescent DyesCarotenoidsThermodynamicsSpectrum Analysis, RamanTemperatureBacteriorhodopsinsPhotosynthesisSolventsPhotosystem I Protein ComplexElectromagnetic PhenomenaMolecular ConformationMyoglobinPorphyrinsMetalloporphyrinsRhodopseudomonasHalobacterium salinarumPyrenesOrganometallic CompoundsSolutionsHydrogen BondingTryptophanProtein ConformationWaterPigments, BiologicalFluorescence PolarizationMathematicsSpectrophotometry, UltravioletLuminescent MeasurementsRhodospirillum rubrumXanthophyllsVibrationTime FactorsOxidation-ReductionChemistry, PhysicalLuminescent ProteinsUltraviolet RaysCyanobacteriaModels, TheoreticalSpectrophotometry, InfraredHydrogen-Ion ConcentrationNuclear Magnetic Resonance, BiomolecularElectrochemistryCytosineElectron Spin Resonance SpectroscopyBase PairingComputer SimulationRhodopsinPhysicochemical PhenomenaGuanineCircular DichroismDNABinding SitesBacterial ProteinsSpectroscopy, Fourier Transform InfraredCopperCrystallography, X-RayMagnetic Resonance SpectroscopyLigandsMutationProtein BindingStructure-Activity Relationship