Dark feathers contain the pigment melanin, which protects feathers against the damaging effects of abrasion and UV radiation.
The BMA has been campaigning against sunbed use since 2003, arguing that just one session a month doubled the average individual's annual dose of UV radiation.
One theory is that difference in levels of vitamin D, which is produced when UV radiation hits the skin, could affect the odds of developing the disease.
Thomas also notes that many shallow-water species went extinct during this epoch, lending credence to the idea that GRB-precipitated solar UV radiation could have been the cause.
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"Oxybenzone is one of the few FDA-approved ingredients that provides effective broad spectrum protection from UV radiation, and has been approved for use since 1978, " said Dr. Daniel M.
An article in the Journal of Geophysical Research, published by the American Geophysical Union, says the Arctic damage threatens to "allow the penetration of enhanced UV radiation at northern mid-high latitudes".
It was also a big week for lighting news as we learned that compact fluorescent light bulbs emit potentially harmful UV radiation -- another good reason to make the switch to LEDs.
The result is a material that is not only waterproof but is able to block out UV radiation from the sun to such an extent that it would rate a Ultraviolet Protection Factor (UPF) of 101.15 if the chart went that high.
Some Class 2 lenses beat the standard: Avaira, for example, block at least 75% of UV-A radiation and 99% of UV-B radiation, according to the package insert.
Only a limited number meet Food and Drug Administration standards for "Class 1" protection, in which 90% of UV-A radiation is blocked and 99% of UV-B radiation is blocked.
The microbiological content of the water is eliminated by electroporation, oxidation, ionization, UV and IR radiation and shockwaves.
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But the increased ultra-violet (UV) solar radiation which the damaged ozone allows through to the surface of the earth is a threat to all living things.
Vitamin D is incorporated in the body when skin is exposed to sunlight of a certain wavelength but in the UK, during winter months, UV-B radiation can be insufficient to properly support vitamin D synthesis in the body.
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