Melanins, which widely exist in animals, plants and some
microorganisms, are brown to black pigments. They are not
essential for growth and development in biology but play an
important role in improving survival and competitiveness
(Alois and Michael, 1986). In general, melanins are macro-molecules formed by oxidative polymerization of phenolic
and/or indolic compounds. They are considered an effective
protective screen of organisms, which gradually evolve
and form for resistance to UV and ionizing radiation in the
environment (Sarna, 1984).
Melanins, which widely exist in animals, plants and some microorganisms, are brown to black pigments. They are not essential for growth and development in biology but play an important role in improving survival and competitiveness (Alois and Michael, 1986). In general, melanins are macro-molecules formed by oxidative polymerization of phenolic and/or indolic compounds. They are considered an effective protective screen of organisms, which gradually evolve and form for resistance to UV and ionizing radiation in the environment (Sarna, 1984).
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