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Health effects of sunlight exposure. Exposing skin to the ultraviolet radiation in sunlight has both positive and negative health effects. On the positive side, exposure allows for the synthesis of vitamin D 3. Vitamin D has been suggested as having a wide range of positive health effects, which include strengthening bones [ 1] and possibly ...
— April 17, 1947 Atomic Energy Commission memo from Colonel O.G. Haywood, Jr. to Dr. Fidler at the Oak Ridge National Laboratory in Tennessee Between 1946 and 1947, researchers at the University of Rochester injected uranium-234 and uranium-235 in dosages ranging from 6.4 to 70.7 micrograms per kilogram of body weight into six people to study how much uranium their kidneys could tolerate ...
A variety of human hair colors; from top left, clockwise: black, brown, blonde, white, red. Human hair color is the pigmentation of human hair follicles and shafts due to two types of melanin: eumelanin and pheomelanin. Generally, the more melanin present, the darker the hair. Its tone depends on the ratio of black or brown eumelanin to yellow ...
It’s common and normal to experience a little bit of hair loss daily. Most guys shed 50 and 100 hairs per day, even if they aren’t affected by male androgenetic alopecia, or male pattern baldness.
The U.S. Food and Drug Administration is considering a ban on certain hair-straightening chemicals that have been used by Black women for years and that research shows may increase the risk of ...
Radiation burn. A radiation burn is a damage to the skin or other biological tissue and organs as an effect of radiation. The radiation types of greatest concern are thermal radiation, radio frequency energy, ultraviolet light and ionizing radiation . The most common type of radiation burn is a sunburn caused by UV radiation.
Albinism is a genetic abnormality in which little or no pigment is found in human hair, eyes, and skin. The hair is often white or pale blond. However, it can be red, darker blond, light brown, or rarely, even dark brown. Vitiligo is a patchy loss of hair and skin color that may occur as the result of an auto-immune disease.
A woman with dyed pink hair. Hair coloring, or hair dyeing, is the practice of changing the color of the hair on humans' heads.The main reasons for this are cosmetic: to cover gray or white hair, to alter hair to create a specific look, to change a color to suit preference or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching.