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Unformatted text preview: e of Antarctica . Hence, melanins are
ancient pigments that have probably been selected because they
enhance the survival of melanized fungi in diverse environments
and, perhaps incidentally, in various hosts. The emergence of
melanin as a non-specific bioprotective material may be a result of
the relative ease with which these complicated aromatic structures
can be synthesized from a great variety of precursors [2,4,5,16–23].
Despite the high prevalence of melanotic microorganisms in
radioactive environments, it is unlikely that melanin is synthesized
solely for the purposes of protection (shielding) from ionizing
radiation. For example, in high elevation regions inhabited by
melanotic fungi the background radiation levels are approximately
500–1,000 higher than at sea level, which amounts to a dose of
0.50–1.0 Gy/year. Since the overwhelming majority of fungi, INTRODUCTION
The term ‘‘melanin’’ originates from melanos - a Greek word for
black. Melanin is a high molecular weight pigment, ubiquitous in
nature, with a variety of biological functions . Many fu...
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This note was uploaded on 03/20/2014 for the course PSYC 101 taught by Professor Catone during the Spring '07 term at CSU Fullerton.
- Spring '07