Ultraviolet RaysLightPhotosensitizing AgentsPhotochemical ProcessesPhotochemistryPhotochemotherapyRadiation EffectsSpectrophotometry, UltravioletUltraviolet TherapyDose-Response Relationship, RadiationSinglet OxygenMethylene BlueColorRutheniumInfrared RaysFullerenesGamma RaysSunlightAzo CompoundsSemiconductorsPorphyrinsSolar EnergyTolonium ChlorideDeoxyribodipyrimidine Photo-LyaseSkinPhotolysisPyrimidine DimersTitaniumPUVA Therapy