PhotoBiology is the science of the effect of light on biological processes. This includes photosynthesis, photochemistry, photophysics, photomorphogenesis, vision, bioluminescence, circadian rhythms and photodynamic therapy. Phototoxicity results from non-ionizing radiation (i.e. ultraviolet, visible and infrared radiation). Non-ionizing radiation is any type of electromagnetic radiation that does not carry enough energy per quantum (photon energy below 10 eV) to completely remove an electron from an atom or molecule. When photons interact with molecules, the molecules can absorb the photon energy and become excited, reacting with surrounding molecules and stimulating "photochemical" and "photophysical" changes. Respiration may be affected by light during photosynthesis or in dark respiration, with the transient response of light-enhanced dark respiration.
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