SpectrophotometrySpectrophotometry, UltravioletArsenazo IIIMicrospectrophotometrySpectrum AnalysisKineticsHydrogen-Ion ConcentrationAzo CompoundsSpectrometry, FluorescenceOxidation-ReductionRetinal PigmentsColorimetryChromatography, High Pressure LiquidSpectrophotometry, InfraredAutoanalysisAbsorptionLightIndicators and ReagentsPhotochemistrySpectrophotometry, AtomicPhenolsulfonphthaleinAcoustic Impedance TestsAudiologyColoring AgentsEar CanalTemperatureFlow Injection AnalysisCircular DichroismPhotolysisNaphthalenesulfonatesNephelometry and TurbidimetrySpectroscopy, Fourier Transform InfraredDithioniteBacterial ChromatophoresCalibrationMurexideRod OpsinsHemeRana temporariaElectron TransportChromogenic CompoundsElectron Spin Resonance SpectroscopyProtein ConformationPotentiometryPhotometryCentrifugationRhodopsinBacteriorhodopsinsPhotoreceptors, MicrobialMathematicsCattleBromcresol GreenEnzyme-Linked Immunosorbent AssayBromcresol PurpleTerahertz SpectroscopyBinding SitesBromphenol BlueSulfhemoglobinCytochromesBacteriochlorophyllsBone ConductionCarboxyhemoglobinHearing Loss, ConductiveMethodsProtein BindingMethemoglobinPigments, BiologicalTime FactorsModels, ChemicalPhycocyaninCarbon MonoxideFerricyanidesRhodobacter sphaeroidesPhycobilinsMicroscopy, UltravioletIronDrug StabilityReference StandardsChemistryUrate OxidaseFuraldehydeEscherichia coliOxidoreductasesThermodynamicsChlorophyllRetinaldehydeUltraviolet RaysDiethyl PyrocarbonateHydroxylaminesFluorescenceRhodanineBilirubinInfrared RaysReproducibility of ResultsSensitivity and SpecificitySolventsMolecular Sequence DataSpectroscopy, Near-InfraredChemical PhenomenaHydroxylamine