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Integrated Pest Management

(Encyclopedia)Integrated Pest Management (IPM), planned program that coordinates economically and environmentally acceptable methods of pest control with the judicious and minimal use of toxic pesticides. IPM progr...

Morgan, Thomas Hunt

(Encyclopedia)Morgan, Thomas Hunt, 1866–1945, American zoologist, b. Lexington, Ky., Ph.D. Johns Hopkins, 1890. He was professor of experimental zoology at Columbia (1904–28) and from 1928 was director of the l...

Kornberg, Arthur

(Encyclopedia)Kornberg, Arthur, 1918–2007, American biochemist, b. Brooklyn, grad. College of the City of New York (B.S., 1937) and Univ. of Rochester (M.D., 1941). In 1942 he joined the U.S. Public Health Servic...

age grade and age set

(Encyclopedia)age grade and age set, differentiation of social role based on age, commonly found in small-scale societies of North America and East Africa. Age sets are a type of sodality (nonresidential groups tha...

Wilhelmshaven

(Encyclopedia)Wilhelmshaven vĭlˌhĕlms-häˈfən [key], city (1994 pop. 91,680), Lower Saxony, NW Germany, on Jade Bay, an inlet of the North Sea. It is a major oil port and an industrial center. Manufactures inc...

trickster

(Encyclopedia)trickster, a mythic figure common among Native North Americans, South Americans, and Africans. Usually male but occasionally female or disguised in female form, he is notorious for exaggerated biologi...

Wood, Robert Williams

(Encyclopedia)Wood, Robert Williams, 1868–1955, American physicist, b. Concord, Mass., grad. Harvard (B.A., 1891). After studying abroad he became associated with Johns Hopkins as professor of experimental physic...

Yalow, Rosalyn Sussman

(Encyclopedia)Yalow, Rosalyn Sussman, 1921–2011, American medical physicist, b. New York City, Ph.D. Univ. of Illinois, 1945. As a researcher at the Bronx Veterans Administration Hospital (from 1947), Yalow and c...

fortification

(Encyclopedia)fortification, system of defense structures for protection from enemy attacks. Fortification developed along two general lines: permanent sites built in peacetime, and emplacements and obstacles hasti...

Chichimec

(Encyclopedia)Chichimec chēchēmĕkˈ [key], general term for the peoples of the Valley of Mexico between the periods of Toltec ascendancy and Aztec ascendancy. Before the 11th cent. the Chichimec were nomadic peo...