LECTURE 20 - Lecture #20: Soaking Up the Sun & Skin...

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Biology of Cancer and AIDS
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Skin Cancer Each Year over 1.3 million people in the United States find out that they have skin cancer Skin cancer is almost 100% curable if found and treated right away
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Skin Cancer Risk Factors http://www.bendweekly.com/news/3022.html
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http://www.tancanada.org/info.php Tanning and Cancer Risk
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What are risk factors for skin cancer? Heredity - people with a family history of skin cancer are generally at a higher risk of developing the disease. People with fair skin, and a northern European heritage, appear to be most susceptible Environment - level of UV light today is higher than it was 50 or 100 years ago. Ozone serves as a filter to screen out and reduce the amount of UV light that we are exposed to. With less atmospheric ozone, a higher level of UV light reaches the earth's surface. Multiple nevi (moles) or atypical nevi. Occupational exposure to coal tar, pitch, creosote, arsenic compounds, or radium. Elevation - UV is stronger as elevation increases (because the thinner atmosphere at higher altitudes cannot filter UV as effectively as it does at sea level). Latitude - the rays of the sun are strongest near the equator. Cloud cover - places with regular cloud cover may actually reduce UV -- resulting in a 50 percent lower level of UV light. http://www.umm.edu/skincancer/index.htm
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Sunburned http://www.robd.com/images/museum s/09.03.I02_sunburn.jpg http://www.msnbc.msn.com/id/13360246/
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UVA with wavelength 315-400 nm UVB with wavelength 280-315 nm UVC with wavelength 100-280 nm
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LECTURE 20 - Lecture #20: Soaking Up the Sun & Skin...

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