Photochemical ProcessesLightPhotochemistryQuantum TheoryEnergy TransferSpectrometry, FluorescenceElectronsChlorophyllHalorhodospira halophilaPhotosynthetic Reaction Center Complex ProteinsLight-Harvesting Protein ComplexesPheophytinsPhotoreceptors, MicrobialSpectrum AnalysisBiophysical PhenomenaLuminescence2-NaphthylamineBiophysicsFluorescenceBacteriochlorophyllsSpectrophotometryLauratesProtonsAbsorptionSchiff BasesPhotolysisIsomerismModels, ChemicalSpinacia oleraceaElectron TransportModels, MolecularRetinaldehydePhotonsMolecular StructureRutheniumLasersRhodobacter sphaeroidesPhotosystem II Protein ComplexCarotenoidsFluorescent DyesThermodynamicsKineticsSpectrum Analysis, RamanTemperatureBacteriorhodopsinsPhotosynthesisSolventsPhotosystem I Protein ComplexElectromagnetic PhenomenaMolecular ConformationMyoglobinPorphyrinsMetalloporphyrinsRhodopseudomonasHalobacterium salinarumPyrenesOrganometallic CompoundsSolutionsHydrogen BondingTryptophanProtein ConformationWaterPigments, BiologicalFluorescence PolarizationSpectrophotometry, UltravioletMathematicsLuminescent MeasurementsRhodospirillum rubrumXanthophyllsVibrationOxidation-ReductionChemistry, PhysicalLuminescent ProteinsUltraviolet RaysTime FactorsCyanobacteriaSpectrophotometry, InfraredModels, TheoreticalHydrogen-Ion ConcentrationNuclear Magnetic Resonance, BiomolecularElectrochemistryCytosineElectron Spin Resonance SpectroscopyRhodopsinBase PairingPhysicochemical PhenomenaGuanineComputer SimulationCircular DichroismSpectroscopy, Fourier Transform InfraredCopperBacterial ProteinsBinding Sites