melanin


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melanin

 [mel´ah-nin]
any of several closely related dark, sulfur-containing pigments normally found in the hair, skin, ciliary body, choroid of the eye, pigment layer of the retina, and certain nerve cells. They occur abnormally in the tumors known as melanomas and may be excreted in the urine when such tumors are present (melanuria).

mel·a·nin

(mel'ă-nin),
Any of the dark brown to black polymers of indole-5,6-quinone and/or 5,6-dihydroxyindole 2-carboxylic acid that normally occur in the skin, hair, pigmented coat of the retina, and inconstantly in the medulla and zona reticularis of the adrenal gland. Melanin may be formed in vitro or biologically by oxidation of l-tyrosine or l-tryptophan, the usual mechanism being the enzymatic oxidation of l-tyrosine to 3,4-dihydroxy-l-phenylalanine (dopa) and dopaquinone by monophenol monooxygenase, and the further oxidation (probably spontaneous) of this intermediate to melanin. Compare: eumelanin, pheomelanin.
Synonym(s): melanotic pigment
[G. melas (melan-), black]

melanin

(mĕl′ə-nĭn)
n.
Any of a group of naturally occurring dark pigments, especially the pigment found in skin, hair, fur, and feathers.

melanin

A dark natural pigment found in the epidermis or skin adnexal structures. It is a complex polymer of oxidised tyrosine synthesised from DOPA and dopaquinone in response to actinic stimulation and bound to a carrier protein by melanocytes—in the skin, mucous membrane, pia arachnoid, retina, inner ear and mesentery. Melanin is detected in tissue sections by the Fontana-Masson stain.

melanin

 Physiology A dark natural body pigment found in the epidermis or skin adnexal structures. See Albinism, DOPA, Melanoma.

mel·a·nin

(mel'ă-nin)
Any of the dark brown to black pigments that occur in the skin, hair, pigmented coat of the retina, and medulla and zona reticularis of the suprarenal gland.
[G. melas (melan-), black]

melanin

The body's natural colouring (pigment) found in the skin, hair, eyes, inner ears and other parts. In body cells, melanin is bound to protein. It is a complex POLYMER formed from the amino acid TYROSINE (4-hydroxphenylalanine) by oxidation via dopa and dopaquinone.

melanin

a dark brown or black pigment found in skin or hair and in the iris and choroid layer of the EYE. Melanin is found in special cells called MELANOPHORES. See ALBINISM, DOPA.

Melanin

A dark insoluble pigment found in humans in the skin, hair, choroid layer of the eye, and a part of the brain called the substantia nigra.

melanin

Dark brown to black pigment normally present in the skin, the hair, the choroid, the iris, the retina, the ciliary body, the cardiac tissue, the pia mater and the substantia nigra of the brain. It is absent in albinos. See albinism; fuscin; melanocyte; melanosis; choroidal naevus; retinal pigment epithelium.

mel·a·nin

(mel'ă-nin)
Any of the dark brown to black pigments that occur in the skin, hair, pigmented coat of the retina, and medulla and zona reticularis of the suprarenal gland.
[G. melas (melan-), black]
References in periodicals archive ?
(1.) Kaidbey et al (1979) Potoprotection by melanin - a comparison of black and Caucasian skin.
Indeed, when they measured melanin, the melanocytes made more pigment in the absence of opsin 3.
The scientists initially had to overcome a problem specific to melanin: It is not very water-soluble and therefore difficult to administer.
As we age, the pigmentproducing melanocytes in our hair follicles gradually lose their ability to create melanin. When there are fewer pigment cells in a hair follicle, a strand of hair will appear more transparent as it grows, appearing grey or silver.
"Kasi yung melanin parang defense niya yon for the sun.
Although melanin provides some sun protection, even olive or darker toned skins can burn after a long day in the sun or show signs of skin damage over time (wrinkles, sunspots and blotchiness).
The detection of melanin content was carried out with the slightly modified method (21).
The study presented here was initiated to assess the influence of the melanin content in pigmented reconstructed human epidermis on the capacity of the tissue to resist UV-irradiation.
By inhibiting melanin, one prevents darkness and dullness.
Speaking during the first ever albino photography exhibition tagged 'Angels Among Men' put together by a documentary photographer, Damilola Onafuwa, in Lagos, displaying the shots of over 20 albinos,She said that 'stigmatisation dehumanises albinos more than melanin absence' adding that it cripples their creative geniuses, forcing them to recoil into their shells instead of reaching their 'maximum potential'
It's very likely that Remy Ma will have Chris Brown as one of her guests since the two recently collaborated for a song titled "Melanin Magic." The music video for the track was released on Valentine's Day via iTunes, and it is part of the list of songs appearing on Remy Ma's upcoming album "7 Winters & 6 Summers," which also includes "Wake Me Up" - her collaboration with Lil' Kim.
16 (ANI): Entrepreneur Rachael Roff, who is referred to as a "Melanin expert," has credited her success to the traditional know-how.