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melanism

n. 黑变病

黑变病

WordNet (r) 3.0 (2006) (WordNet)

melanism
n 1: a condition characterized by abnormal deposits of melanin
(especially in the skin) [synonym: {melanosis}, {melanism}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Melanism \Mel"a*nism\ (m[e^]l"[.a]*n[i^]z'm), n. [Gr. me`las,
-anos, black.]
[1913 Webster]
1. An undue development of dark-colored pigment in the skin
or its appendages; -- the opposite of {albinism}.
[1913 Webster]

2. (Med.) A disease; black jaundice. See {Melaena}.
[1913 Webster]

Melanism \Mel"a*nism\ (m[e^]l"[.a]*n[i^]z'm), n. (Ethnol.)
The character of having a high degree of pigmentation, as
shown in dark skin, eyes, and hair.
[Webster 1913 Suppl.]

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Melanism - Wikipedia
Melanism is a congenital high level of melanin in an organism resulting in dark pigmentation In contrast with albinism, which is generally caused by a mutation which is harmful to overall survival, melanistic morphs coexist stably with others in many species, such as squirrels and leopards
MELANISM Definition Meaning - Merriam-Webster
The meaning of MELANISM is an increased amount of black or nearly black pigmentation (as of skin, feathers, or hair) of an individual or kind of organism
What Does Melanistic Mean and What Causes It? - Biology Insights
Understand melanism, the condition of excessive dark pigmentation We detail the genetic origins and the evolutionary factors that drive this striking…
Difference Between Albinism, Melanism And Leucism
Albinism, melanism, and leucism are genetic conditions that affect pigmentation in animals and sometimes humans These conditions are related to melanin, the pigment responsible for the color of skin, hair, fur, feathers, and eyes
Melanism - an overview | ScienceDirect Topics
Melanism is the occurrence of individuals that are darker in pigmentation either as polymorphisms within species or as consistent variation between closely related species (True, 2003)
Melanistic Animals Pictures Facts, What Is Melanism In Animals?
Melanism is a genetic mutation that occurs in many different types of animals, including mammals, reptiles and insects Among the best-known melanistic animals are the black leopards and jaguars known as panthers
Biological Pigment, Skin Color, Sun Protection - Britannica
Melanism refers to the deposition of melanin in the tissues of living animals The chemistry of the process depends on the metabolism of the amino acid tyrosine, the absence of which results in albinism, or lack of pigmentation
Industrial melanism - Wikipedia
Industrial melanism is an evolutionary effect prominent in several arthropods, where dark pigmentation (melanism) has evolved in an environment affected by industrial pollution, including sulphur dioxide gas and dark soot deposits
Skin Pigment Disorders - Johns Hopkins Medicine
Detailed information on the most common types of skin pigment disorders, including albinism, melasma, vitiligo, and skin pigment loss following sun damage
melanism - Wiktionary, the free dictionary
melanism (countable and uncountable, plural melanisms) Congenital abundance or excess of melanin pigmentation in the skin, hair, feathers and or eyes, more than is typical for the species

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