bioluminescence
bioluminescence Production of light, with very little heat, by some living organisms. Its biological function is varied: in some species, such as fireflies, it is a recognition signal in mating; in others, such as squids, it is a method of warding off predators; and in angler fish it is used to attract prey. The light-emitting substance (luciferin) in most species is an organic molecule that emits light when it is oxidized by molecular oxygen in the presence of an enzyme (luciferase).
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Macedonio Melloni , physics.
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