Type of cancer. Melanoma is a skin cancer that originates in the melanocytes‚ a type of cell that makes up the skin. Skin is formed by three layers: epidermis‚ dermis and subcutaneous tissue. Melanocytes‚ together with keratinocytes‚ are part of the epidermis and are responsible for producing melanin‚ a pigment that protects against the damaging effects of sunlight. The formation of melanin - melanogenesis is a biochemical process carried out by melanocytes and is affected by several hormones: α-melanocyte-stimulating
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You are at increased risk of developing melanoma if there is a family history of melanoma in one or more of your first-degree relatives like a parent‚ child‚ brother or sister. The major environmental risk factor for melanoma is overexposure to ultraviolet (UV) radiation from the sun. People who have fair skin that burns or freckles easily need to be especially careful in the sun as protecting yourself against UV overexposure is an important way you can help reduce your risk of developing melanoma
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and thus allowing the buildup of free oxygen in the air. As oxygen moved into the early atmosphere‚ ultraviolet radiation from the sun split the oxygen molecules (O2)‚ which then recombined‚ producing the Earth’s ozone layer (O3). This‚ in turn‚ reduced the amount of incoming ultraviolet radiation striking the Earth. The impact for life on Earth was enormous. With reduced amounts of ultraviolet radiation‚ organisms moved to shallow water and‚ ultimately‚ onto the land. Materials: Elodea stem
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Recommendation | 8 | References | 9-10 | Appendices | 11-13 | Bibliography | 14 | Abstract Ozone is concentrated in the ozone layer ‚ which is located in the stratosphere. It plays an important role to protect humans and other life from ultraviolet light. Unfortunately‚ Chlorofluorocarbons (CFCs) have been released into the atmosphere and have contributed to the depletion of this important protective layer. This will cause humans suffering like skin cancer and UV radiation may kill plankton
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indication becomes visible to the inspector. Inspection is performed under ultraviolet or white light‚ depending upon the type of dye used - fluorescent or nonfluorescent (visible). [edit] Materials Penetrants are classified into sensitivity levels. Visible penetrants are typically red in color‚ and represent the lowest sensitivity. Fluorescent penetrants contain two or more dyes that fluoresce when excited by ultraviolet (UV-A) radiation (also known as black light). Since Fluorescent penetrant
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Birth control is a widely controversial topic among young teenage girls. While many people may think that a teenager is on birth control for sexual use‚ there are more advantages to it. Birth control can be used to help with a teenage girl’s menstrual cramps‚ acne‚ preventing pregnancy‚ and you are less likely to get ovarian and uterine cancer. Certain birth controls can also help prevent pelvic inflammatory disease‚ ovarian cysts and anemia. While adults see birth control as the worst thing you
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California is in a drought and farmers believe our only option is to take water from under the ground. But‚ groundwater depletion is causing a lot of bad things to happen. It is making the layer of clay above collapse‚ when the clay collapses the dirt above gives way and sinks. This sinking causes sinkholes and is very dangerous. The sinking also damages pipes‚ buckles walls of irrigation canals‚ and cracks homes. Although the sinking is already a big enough threat the water in general could
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released into space by stars such as the Sun. These kinds of energies include some that you will recognize and some that will sound strange. They include: * Radio Waves * TV waves * Radar waves * Heat (infrared radiation) * Light * Ultraviolet Light (This is what causes Sunburns) * X-rays (Just like the kind you get at the doctor’s office) * Short waves * Microwaves‚ like in a microwave oven * Gamma Rays All these waves do different things (for example‚ light waves make things
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The Hubble Space Telescope is a space telescope that was carried into orbit by a Space Shuttle in 1990 and remains in operation. A aperture telescope in low Earth orbit‚ Hubble’s four main instruments observe in the near ultraviolet‚ visible‚ and near infrared. The telescope is named after the astronomer Edwin Hubble. Hubble’s orbit outside the distortion of Earth’s atmosphere allows it to take extremely high-resolution images with almost no background light. Hubble’s Deep Field has recorded some
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visual pigments in these cones‚ and that his means that birds have a very highly developed sense of color recognition. Some species‚ such as the hummingbird‚ are believed to be able to see ultraviolet light because the flowers from which they drink the nectar have patterns that are visible only under the ultraviolet light. To find out what colors birds are attracted to‚ we can look at the colors of flowers and fruits birds tend to consume. Humming birds‚ for example‚ like the color red. Other species
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