The relationship between hydrogen peroxide-treated melanin and its biochemistry and photochemistry is important. |
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In the absence of melanin, the ascorbic acid undergoes metal-catalyzed autoxidation. |
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A few species of hummingbirds and European Starling are known to produce UV hues with coherently scattering melanin arrays in feather barbules. |
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Without melanin in albinos ' eyes, the blood vessels are visible, so the eyes are pink. |
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The majority of studies on melanin ornaments cited in Table 1 measured only the size of discrete patches of melanic feathers. |
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Melanotan works by boosting melanin, the skin pigment that makes us brown and protects us against skin cancer. |
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One theory focuses on the fact that people with red hair have a different type of melanin than people with dark hair. |
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Even in its natural state, the melanin biopolymer contains free electrons in its conjugated structure. |
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The body normally converts the amino acid tyrosine into the pigment melanin. |
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This iatrogenic hyperpigmentation is associated with lipofuscin rather than melanin deposits. |
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When the skin is exposed to sunshine, it produces a brown pigment called melanin. |
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Freckles are spots of increased pigment, produced by cells called melanocytes, which make melanin. |
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Similarly, in patients with chronic renal failure, increased melanin production may cause the distal part of the nail bed to turn brown. |
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The color of a person's hair is determined by the amount and distribution of melanin in the cortex of each hair. |
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The strongly iridescent colors of bird feathers are produced by arrays of melanin granules in the barbules of feathers. |
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The melanosomes convert tyrosine to melanin, giving skin its color. |
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The amount of melanin in the cortex of each hair determines its color. |
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The normal response to solar radiation is an increase in melanin production, which causes uniform tanning in most persons but leads to freckling in some. |
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The same principle is being used in human studies that employ short laser pulses to target pigmented cells containing endogenous melanin particles. |
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Molecular chromophores besides melanin abound in the skin and include keratin, collagen, elastin, proteins, lipids, steroids and urocanic acid to name a few. |
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The leukoderma is based on a decrease of melanin in mclunocytes or disappearance of melanocytes at the dermal-epidermal junction. |
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In a xanthic albino the process of making melanin has been interrupted. |
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Lack of melanin in development of the retina is the primary cause of visual impairment in albinism. |
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Intense micro-exfoliating actions due to the presence of AHA that helps eliminate the accumulations of melanin pigments. |
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Quick thawing using running water is recommend to wash out the water-soluble melanin forming substances. |
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Black discoloration is caused by melanin formation most commonly in the ventral tail segment joints and muscle surrounding the pericardium. |
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Histochemical stains for iron and melanin were also reviewed. |
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Decreased hair growth and numbers with associated graying with the decrease and loss of melanin. |
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The drug had a high affinity to melanin as indicated by a high retention in pigmented skin and uveal tract. |
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Iridescent colours result from the thinly laminated structure of the barbules and are enhanced by underlying melanin deposits. |
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Glutathione's ability to inhibit melanin synthesis makes it an essential component of melasma and depigmentation treatments. |
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The blemishes produced by age and the excessive exposure to sun are characterised by an excessive accumulation of melanin at epidermic level. |
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Each melanocyte, via its dendrites, supplies melanin to neighbouring keratinocytes. |
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The absence of melanocytes, which occurs in vitiligo, results in a loss of melanin pigmentation. |
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A polarizing element comprising a polymeric film having at least one dichroic dye therein and at least one melanin therein. |
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The first role of melanin is to protect skin against sunrays and blue light. |
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The melanin produced by melanocytes is of two kinds: dark brown eumelanin and pale red or yellowish phaeomelanin. |
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Racism is not dead, even when we know that everything is a question of melanosomes, melanocytes and melanin. |
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At the same time, these melanocytes increase their production of melanin which then is oxidized and causes tanning. |
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This is a melanin deficiency that renders African skin pink and vulnerable to cancer, turns hair wispy and leaves eyes pale and impaired. |
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It is due to progressive manufacturing of the skin's natural pigment, melanin. |
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The melanin content in the skin can be determined by measuring the amount of reflected light. |
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All the people who have more melanin are very much less likely to get this problem of stretch marks. |
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The mini ultrasonic scrubber can remove grease on your skin and eliminate aging cutins and melanin. |
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The second, Airwear Melanine, is tinted using melanin pigment to protect the eyes and skin from ultra-violet rays. |
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Spergularia extract: controls the production of melanin for a more even, brighter complexion. |
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By making a spectroscopic assessment, skin pigmentation is no longer a limiting factor since melanin can be accounted for. |
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Hair contains water, lipids, minerals and melanin, keratin is the main constituent. |
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It is believed that the formation of melanin is regulated by aldosterone, which is the most active mineralocorticoid hormone secreted by the adrenal cortex. |
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The most common type of leprosy causes the pallidness of the skin which proves that people had to have melanin first in order for them to become leprous. |
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Medaka P is strongly expressed in the eyeball of embryos and adults, where melanin is produced in the choroid membrane and retinal pigment epithelium. |
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Histochemical stains confirmed the presence of melanin, since brown pigment removable by permanganate bleaching was demonstrated by Fontana-Masson stain. |
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This ingredient acts as a melanotropin inhibitor to help prevent the synthesis of melanin. |
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Chloasma, a common skin disease caused by excess melanin, manifests in light born or black patches on the face. |
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Melanin-blocking action «locks» melanin synthesis inside the melanocyte. |
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These darker patches or spots occur when there is an increase of melanin that forms in the skin. |
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Along with the cancer, the manipulated T-cells attacked the normal cells with melanin, causing vitiligo, in which skin loses its pigment, and his hair to turn white. |
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The primary pigment that determines human skin, hair and eye colour is melanin, which is synthesised by melanocytes. |
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The melanin pigments are produced by the melanocytes of the hair follicle. |
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Edema, telangiectases, a moderate polymorphic inflammatory infiltrate, and melanin clumps are noted in the dermis. |
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Melanocytes: cells responsible for producing melanin grains. |
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The colour change is due to increased melanin content in stromal melanocytes on the iris rather than to an increase in the number of melanocytes, although the exact mechanism of action is unknown at this time. |
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Any genetic mutation making tyrosinase less active or absent causes albinism, a condition characterised by the absence of melanin and therefore white hair and a very light skin which is ultra-sensitive to the sun. |
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Decolorization of melanin by lignin peroxidase from Phanerochaete chrysosporium. |
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Our research confirmed that lignin peroxidase uniquely breaks down or depolymerizes melanin in human skin. |
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The propensity for rizatriptan to bind melanin has not been investigated. |
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It participates in the synthesis of melanin, which is a hair pigment. |
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Clinical tests conducted by the certified Dermscan laboratory in France have demonstrated that melanin pigment lenses offer as much protection as a 140-index sun cream. |
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Lacking photoprotection provided by melanin, individuals with OCA are highly susceptible to skin cancers, particularly squamous cell carcinoma. |
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The most common form of biological melanin is eumelanin, a brown-black polymer of dihydroxyindole carboxylic acids. |
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Leucistic individuals usually have functional tyrosinase, a key enzyme for melanin production in vertebrates, and produce melanin. |
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Sliced apples turn brown with exposure to air due to the conversion of natural phenolic substances into melanin upon exposure to oxygen. |
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In some species the pigment melanin may play a role in extracting energy from ionizing radiation, such as gamma radiation. |
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The local structure seen in Figure 3 may in fact be the entire structure of a fundamental melanin protomolecule. |
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The scientists found that the outside layer of each barbule consisted of a two-dimensional crystal structure composed of melanin rods. |
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But the world wants to define me by my mammary glands and melanin. |
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Anagen hair are full of melanin in their base. |
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What the flakes leave behind on this dark-skinned black man are patches of skin missing their requisite melanin, the sallowness that takes its place making me as splotchy as a weather map. |
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Some professional UV lotions are designed to encourage the melanin to rise to the surface of the skin and oxidise, accelerating the tan. |
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The mechanism of action is based on the principle of the selective photo-thermolysis, based on selective absorption of the light by the melanin located in a hair follicle. |
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Melanogenesis is influenced by exogenous and endogenous factors, which may lead to excessive localized melanin production and the consequent appearance of melanic blemishes or marks. |
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The Lanaset and Resloom process, consisting of depositing a thermoset resin on the wool fibre, obtained by the reaction of melanin and formaldehyde in the presence of acid catalysts. |
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This dermatologically tested treatment with active depigmentation ingredients acts directly on the melanin synthesis, reducing the visibility of the spot and preventing excessive pigment synthesis. |
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Melanocytes produce two forms of melanin, black-brown eumelanin and red-yellow pheomelanin. |
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When these wavelengths damage pigment cells, it causes them to produce brown pigment called melanin in an uncontrolled fashion. |
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A melanocyte can supply melanin to 35-40 keratinocytes. |
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This is due to there being too much melanin on the surface of the skin,' explains Victoria Smith, aesthetics practitioner at Absolute Aesthetics. |
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Hesperidin safely reduces the appearance of age spots by reducing the activity of tyrosinase, the enzyme responsible for producing the skin pigment melanin. |
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Citrus bioflavonoids, natural extracts that function similarly to hydroquinone, gently diffuse melanin, resulting in a more natural, brightened appearance. |
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They were stained with hematoxylin and eosin for general tissue morphology as well as Gormori's aldehyde fuchsin for elastic tissue and Lillie's ferrous iron for melanin. |
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It reduces melanogenesis through a mechanism blocking the melanin release by the melanocytes, an alternative to the broadly known inhibition of tyrosinase. |
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Excessive melanin production occurs in melasma, lentigo, nevocellular nevi and malignant melanoma, whereas the loss of melanocyte function leads to vitiligo. |
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Dermatopathic lymphadenopathy represents the reaction of a superficial lymph node to the drainage of skin antigens and melanin from various chronic dermatoses. |
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Another form of melanin is pheomelanin, a cysteine containing red-brown polymer of benzothiazine units largely responsible for red hair and freckles. |
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Two genes that are known to influence melanin production, LYST and AIM1, are both mutated in polar bears, possibly leading to the absence on this pigment in their fur. |
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