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aviation medicine

(Encyclopedia)aviation medicine, scientific study of the biological effects of aviation, especially on human beings. Although aviation medicine is concerned with such problems as the spread of diseases by persons t...

Philippines, University of the

(Encyclopedia)Philippines, University of the, main campus at Quezon City, the Philippines; English language; founded 1908. Among its many schools and colleges are those of agriculture, forestry, fisheries, veterina...

corticosteroid drug

(Encyclopedia)corticosteroid drug kôrˌtəkōstârˈoid [key], any one of several synthetic or naturally occurring substances with the general chemical structure of steroids. They are used therapeutically to mimic...

gibberellins

(Encyclopedia)gibberellins jĭbˌərĕlˈĭnz [key], a group of growth-regulating substances of plants, having complex chemical structure, of which the best known, gibberellic acid, is noted for its promotion of st...

nalorphine

(Encyclopedia)nalorphine nălˈərfēn [key], derivative of morphine that acts to reverse the effects of morphine and other narcotics. It counteracts narcotic-induced nervous system and respiratory system depressio...

Head Start

(Encyclopedia)Head Start, U.S. educational program for disadvantaged preschool children, established under the Economic Opportunity Act of 1964. Aimed initially only at poor children, its purpose was to organize pr...

Balaton

(Encyclopedia)Balaton băˈlətŏn, Hung. bŏˈlŏtôn [key], lake, 230 sq mi (596 sq km), W central Hungary, at the foot of the Bakony Forest. The Zala River is its main tributary; the lake is drained by the Sió ...

Kaiser, Henry John

(Encyclopedia)Kaiser, Henry John, 1882–1967, American industrialist, b. Sprout Brook, N.Y. He organized his first construction company in 1913, soon entered the road-paving business, and by 1930 was a leader in t...

sanitary science

(Encyclopedia)sanitary science, principles of health preservation, embracing hygiene, on an individual level, and public health, on a communal level. Those who specialize in sanitary science are sanitary engineers....

defoliant

(Encyclopedia)defoliant, any one of several chemical compounds that, when applied to plants, can alter their metabolism, causing the leaves to drop off. In agriculture defoliants are used to eliminate the leaves of...