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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 ...
Health threats from cosmic rays are the dangers posed by cosmic rays to astronauts on interplanetary missions or any missions that venture through the Van-Allen Belts or outside the Earth's magnetosphere. [ 1][ 2] They are one of the greatest barriers standing in the way of plans for interplanetary travel by crewed spacecraft, [ 3][ 4][ 5] but ...
Menkes disease. Menkes disease ( MNK ), also known as Menkes syndrome, [ 1][ 2] is an X-linked recessive disorder caused by mutations in genes coding for the copper-transport protein ATP7A, [ 3] leading to copper deficiency. [ 4][ 5] Characteristic findings include kinky hair, growth failure, and nervous system deterioration.
Human physical appearance is the outward phenotype or look of human beings. Image of a European female (left) and an East Asian male (right) human body seen from front (upper) and back (lower). Adult human bodies photographed whose naturally-occurring pubic, body, facial, but not head hair have been deliberately removed to show anatomy.
The field strength of electromagnetic radiation is measured in volts per meter (V/m). [ 2]: 139. The most common health hazard of radiation is sunburn, which causes between approximately 100,000 and 1 million new skin cancers annually in the United States. [ 3][ 4] In 2011, the World Health Organization (WHO) and the International Agency for ...
D5 is generally considered safe to use. But if you’re concerned, Jung stresses the importance of having proper ventilation when using everyday hair products that may contain D5. “Wherever you ...
The body uses UV light to generate vitamin D so there is a need to balance getting enough sunlight to maintain healthy vitamin D levels and reducing the risk of melanoma; it takes around a half-hour of sunlight for the body to generate its vitamin D for the day and this is about the same amount of time it takes for fair-skinned people to get a ...
Melanocytes are melanin -producing neural crest -derived [ 3] cells located in the bottom layer (the stratum basale) of the skin's epidermis, the middle layer of the eye (the uvea ), [ 4] the inner ear, [ 5] vaginal epithelium, [ 6] meninges, [ 7] bones, [ 8] and heart found in many mammals and birds. [ 9] Melanin is a dark pigment primarily ...