what is the relationship between uv radiation and skin color?
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Relationship between skin response to ultraviolet exposure and skin color type. Sun exposure is responsible for detrimental damage ranging from sunburn to photoaging and skin cancer. This damage is likely to be influenced by constitutive pigmentation.
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There is a direct correlation between the geographic distribution of ultraviolet radiation (UVR) and the distribution of indigenous skin pigmentation around the world. Areas that receive higher amounts of UVR, generally located closer to the equator, tend to have darker-skinned populations.
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The atmosphere does little to shield these rays—most UVA radiation reaches Earth's surface. UVA rays cause skin aging and eye damage, and can lower your body's ability to fight off illness. UVA rays also contribute to the risk of skin cancer.
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UVA rays can penetrate your skin more deeply and cause your skin cells to age prematurely. About 95 percent of the UV rays that reach the ground are UVA rays. The other 5 percent of UV rays are UVB. They have higher energy levels than UVA rays, and typically damage the outermost layers of your skin, causing sunburn.
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Here are some important facts about ultraviolet A (UVA) rays and how they affect your skin. They have higher wavelengths, but lower energy levels than other UV rays. They're more penetrating than UVB rays, which means they can affect cells deeper in the skin.
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UVA radiation is what makes people tan. UVA rays penetrate to the lower layers of the epidermis, where they trigger cells called melanocytes (pronounced: mel-an-oh-sites) to produce melanin. Melanin is the brown pigment that causes tanning.
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What Is Ultraviolet Light? Tanning is the body's natural shield against uv rays. Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible for summer tans — and sunburns. However, too much exposure to UV radiation is damaging to living tissue.
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Sun exposure is responsible for deleterious effects such as sunburn, photoaging, and skin cancer. Ethnic origin and skin color, related to constitutive pigmentation represent major parameters involved in skin responses to solar ultraviolet (UV) exposure.
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Circulating vitamin D concentrations differ by skin color: Individuals with darker skin produce less vitamin D with the same amount of sunlight exposure than individuals with lighter skin color [10,12].
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Ultraviolet (UV) light occupies the spectral range of wavelengths slightly shorter than those visible to humans. Because of its shorter wavelength, it is more energetic (and potentially more photodamaging) than 'visible light', and it is scattered more efficiently in air and water.
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For example, ultraviolet (UV) rays are clearly a major cause of melanoma. UV rays can damage the DNA in skin cells. Sometimes this damage affects certain genes that control how the cells grow and divide. If these genes no longer work properly, the affected cells may become cancer cells.
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Three pigments contribute to skin color: melanin, carotene, and hemoglobin. Of these, only melanin is made in the skin.
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A new study by researchers at NYU School of Medicine found that UVA radiation damages the DNA in human melanocyte cells, causing mutations that can lead to melanoma. ... Sunlight in the form of UVA radiation causes oxygen in melanocytes to damage DNA.
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UV rays can damage the DNA in skin cells. Sometimes this damage affects certain genes that control how the cells grow and divide. If these genes no longer work properly, the affected cells may become cancer cells. Most UV rays come from sunlight, but some can come from man-made sources such as tanning beds.
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UVA rays can penetrate your skin more deeply and cause your skin cells to age prematurely. ... The other 5 percent of UV rays are UVB. They have higher energy levels than UVA rays, and typically damage the outermost layers of your skin, causing sunburn. These rays directly damage DNA and are the cause of most skin cancers.
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Pigmentation refers to coloring, and skin pigmentation disorders affect the color of the skin. ... The skin might have no color (nonpigmented skin), or it may be lighter than the normal colored skin.
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Ultraviolet A (UVA) has a longer wavelength, and is associated with skin aging. Ultraviolet B (UVB) has a shorter wavelength and is associated with skin burning.