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Bio-photo-chemistry is the study of chemical reactions of molecules in electronically excited states produced by the absorption of infrared (700–1000nm), visible (400–700nm), ultraviolet (200–400nm), or vacuum ultraviolet (100–200nm) light on biological organism. Bond making and bond breaking as well as electron transfer and ionization are often observed in both organic and inorganic compounds as a consequence of such excitation.
Photochemistry, a sub-discipline of chemistry, is the study of chemical reactions that proceeds with the absorption of light by atoms or molecules Everyday examples include photosynthesis, the degradation of plastics and the formation of vitamin D with sunlight. Photochemical reactions involve electronic reorganization initiated by electromagnetic radiation. The reactions are several orders of magnitude faster than thermal reactions.
Photobiology is the scientific study of the interactions of light (technically, non-ionizing radiation) and living organisms. The field includes the study of photosynthesis, photomorphogenesis, visual processing, circadian rhythms, bioluminescence, and ultraviolet radiation effects.
