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behaviorism

(Encyclopedia)behaviorism, school of psychology which seeks to explain animal and human behavior entirely in terms of observable and measurable responses to environmental stimuli. Behaviorism was introduced (1913) ...

tryptophan

(Encyclopedia)CE5 tryptophan trĭpˈtəfăn [key], organic compound, one of the 20 amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian protein. It is one of several essent...

Thurber, James

(Encyclopedia)Thurber, James, 1894–1961, American humorist, b. Columbus, Ohio, studied at Ohio State Univ. After working on various newspapers he served on the staff of the New Yorker from 1927 to 1933 and was la...

sea urchin

(Encyclopedia)sea urchin, spherical-shaped echinoderm with movable spines covering the body. The body wall is a firm, globose shell, or test, made of fused skeletal plates and marked by regularly arranged tubercles...

Shiller, Robert James

(Encyclopedia)Shiller, Robert James, 1946–, American economist, b. Detroit, grad. Univ. of Michigan (B.A., 1967), Massachusetts Institute of Technology (S.M., 1968; Ph.D., 1972). A professor at Yale since 1982, S...

phalanger

(Encyclopedia)phalanger fəlănˈjər [key], any of the numerous and varied marsupials, or pouched mammals, of the family Phalangeridae, found in Australia, New Guinea, and adjacent islands. Many are somewhat like ...

rhythm, biological

(Encyclopedia)rhythm, biological, or biorhythm, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the env...

virology

(Encyclopedia)virology, study of viruses and their role in disease. Many viruses, such as animal RNA viruses and viruses that infect bacteria, or bacteriophages, have become useful laboratory tools in genetic studi...

diet, in nutrition

(Encyclopedia)diet, food and drink regularly consumed for nourishment. Nutritionists generally recommend eating a wide variety of foods; however, some groups of people survive on a very limited diet. The traditiona...

anatomy

(Encyclopedia)anatomy ənătˈəmē [key], branch of biology concerned with the study of body structure of various organisms, including humans. Comparative anatomy is concerned with the structural differences of pl...