Melanin

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  • Skin Color Evolution

    These gene mutations come in the form of a skin pigment called melanin. Skin color is fundamentally based on the amount of melanin in the epidermis. [Roy] Melanin is produced by cells in the epidermis called melanocytes, which are specialized cells with photosensitive receptors that can detect the ultraviolet radiation from the sun. [Bindon] Melanocytes respond to the ultraviolet radiation by producing melanin, which can take two different forms: pheomelanin, which is a red to yellow color and eumelanin, which is dark brown to black in color. [O’Neil] Along with the variation in type, the number and size of melanin molecules plays into the determination of skin color. [Bindon] Eumelanin is found in dark skin and when it is produced by the melanocytes it persists through the epidermis as single particles. [O’Neil] However, pheomelanin is more commonly found in light skin, and when it is synthesized by the melanocytes, instead of remaining as individual particles, they bunch together into membranous organelles. [Roy] These clumps are the cause freckles on the surface of the skin, which why they are most commonly found on people with very fair skin. [Bindon] Essentially, melanin acts as sponge directly under the surface of the skin and absorbs most harmful ultraviolet radiation. This prevents the radiation from traveling any deeper into the skin and damaging the DNA and denature the cells below it. [Crampton] When melanin soaks up the ultraviolet radiation, it darkens in the…

    Words: 1489 - Pages: 6
  • Albinism Essay

    There are many variances in albinism, the two main types are ocular albinism and oculocutaneous albinism. The first mainly affects a person’s eyes, and the latter also affects the eyes but will make also make an individual’s skin and hair white. Oculocutaneous albinism type 1, one of the subtypes of albinism is caused by a mutation in the tyrosinase gene which is due to hypopigmentation due to the lack of melanin production. Currently, there are no known cures for albinism, but there are certain…

    Words: 1299 - Pages: 6
  • Essay On Melanoma

    UVC. These waves are all classified by wavelengths, describing the distance between peaks in a sequence of rays. UVA has the longest wavelength and when exposed to human skin, it penetrates all the way to the dermis. UVB rays have short wavelengths and only penetrate the epidermis. UVC rays have the shortest wavelength, too short to penetrate the human skin. They are, however, absorbed by the ozone layer. When exposed to too much UVA rays, the dominant ray found in tanning beds, the melanocytes,…

    Words: 1040 - Pages: 5
  • Causes Of Age Spots Essay

    Fortunately, age spots are usually harmless. However, nobody actually wants to have them, but many people do. Luckily there are ways to prevent, fade, and even remove those annoying age spots. What are age spots and who can get them? Age spots, also known as "liver spots," are identically colored, but randomly occurring dark spots, typically more common as you age. Age spots are caused by prolonged sun exposure, which is why they are more prevalent the older you get. They appear in areas more…

    Words: 616 - Pages: 3
  • The Consequences Of Skin Cancer

    Each day that passes by, the number of cases related to skin cancer increases all over the world. This illness can cost your life, so people should be aware of the consequences. It is important to know about types, risky factors, and how to prevent it, because we must have a healthy lifestyle. Melanoma is the worst kind of skin cancer. It appears when human cells called melanocytes become malicious and start growing faster than the usual. These cells develop a pigment called Malanin that is in…

    Words: 407 - Pages: 2
  • Adriana Varejeo

    imposing the question “What is your colour?”, the 135 personal color identity surpassed the five colors given by the census. The tubes of custom oil paint were designed by Varejão from the detailing of the cap to the way it was laid within an enclosed glass box on a wooden board. The exhibition set-up was simple and consistent from the layout of the paintings evenly spaced and laid side by side in a horizontal manner. “Polvo: mixed media”, the oil tubes, were set up on a podium in the center of…

    Words: 1082 - Pages: 4
  • Wrinkles Pestle Analysis

    5 Ways To Erase Fine Lines And Wrinkles Naturally Overview Wrinkles are one of the signs of aging and most people always like looking young. There is no specific age when the wrinkles start appearing; it all depends on how an individual maintains his/her skin. There is a belief that the light skin people are more vulnerable to wrinkles than those with dark skin. This is because people with light skin have less melanin that shields them from the UV rays which breaks down the collagen that is…

    Words: 800 - Pages: 4
  • Purple Eye Colors

    Are purple eyes just legends? Research show that eye color is determined by the amount of melanin in the iris and the scattering light in someone's eyes. Research also shows that there are different counts of people developing purple eyes after birth. A study on Alexandria's Genesis shows that it is a very rare color in the eye's of almost all women only. So is it true? Many people do not believe that it is real because of all the outrageous effects that it has on some people who have…

    Words: 1659 - Pages: 7
  • Sunburned Research Paper

    Why we get sunburned A suntan is the result of the body’s defense mechanism against harmful ultra violet light emitted by the sun. All bands of UV radiation damage collagen fibers and accelerate aging of the skin. Both UVA and UVB destroy vitamin A in skin, which may cause further damage. UVB light can cause direct DNA damage. In defense, our body releases a pigment called melanin, which is produced by cells in our skin called melanocytes. Melanin absorbs ultraviolet light and dissipates it as…

    Words: 467 - Pages: 2
  • Essay On Tanning

    In Miyamuera’s (et al., 2010) study, the effects of various wavelengths of ultraviolet was compared through repeated exposure of human skin to suberythemal doses of ultraviolet A and/or ultraviolet B for two weeks. The study showed that in the ultraviolet B tanned skin; there was a higher melanin content and ultraviolet-protective effects against DNA damage as there was in the ultraviolet A tanned skin. The tanning from ultraviolet A was caused by the photooxidation of existing melanin and…

    Words: 710 - Pages: 3
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