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from article Aging
Rates of death in the United States showing an exponential increase in mortality risk with chronological age. (Copyright © McGraw-Hill Education)
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from article Aging
Hypothetical impact of reduced disability of the aging population in the twentieth, twenty-first, and twenty-second centuries. The goal is to keep the interval of disability prior to death as high (rectangular) as possible at the end of the life…
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from article Behavior genetics
DNA analysis can be used to determine the positions (loci) of genes on chromosomes. Each gene may come in several variations, called alleles, that may produce somewhat different phenotypic outcomes, influencing behavior. Molecular weight markers are…
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from article Behavior genetics
Alcoholism, a very complex behavioral disorder, results from the interplay of genetics, environment, and physiology in the context of development. (Credit: National Institute of Alcohol Abuse and Alcoholism)
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from article Epidemic viral gastroenteritis
A computer-generated representation of the Norwalk virus, the best-known member of the noroviruses. This virus is often associated with epidemic viral gastroenteritis. (Image courtesy of Richard J. Feldmann)
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from article Vitamin
The fat-soluble vitamin group includes vitamins A, D, E, and K. Various foods (and sunlight in the case of vitamin D) can supply these essential compounds. (Copyright © McGraw-Hill Education)
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from article Vitamin
Conversion of vitamin D to its active form in the body. Vitamin D3 can be obtained from the diet, or it can be produced in skin by the ultraviolet irradiation of 7-dehydrocholesterol. 1α,25-Dihydroxyvitamin D3 is believed to be the only active form…
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from article Dead reckoning
Marine magnetic compass.
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from article Dead reckoning
Typical aeronautical deviation card.
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from article Dead reckoning
A plotter in use among air navigators.
