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membrane

(Encyclopedia)membrane, structure composed mostly of lipid and protein that forms the external boundary of cells and of major structures within cells. Membrane organization is based on a sheet two molecules thickâ€...

information storage and retrieval

(Encyclopedia)information storage and retrieval, the systematic process of collecting and cataloging data so that they can be located and displayed on request. Computers and data processing techniques have made pos...

perception

(Encyclopedia)perception, in psychology, mental organization and interpretation of sensory information. The Gestalt psychologists studied extensively the ways in which people organize and select from the vast array...

beet

(Encyclopedia)beet, biennial or annual root vegetable of the family Chenopodiaceae (goosefoot family). The beet (Beta vulgaris) has been cultivated since pre-Christian times. Among its numerous varieties are the re...

Axelrod, Julius

(Encyclopedia)Axelrod, Julius ăkˈsəlrŏd [key], 1912–2004, American biochemist whose work was influential in the development of pharmaceuticals, b. New York City, grad. City College, N.Y. (B.S. 1933), New York...

spraying

(Encyclopedia)spraying, horticultural practice of applying fungicides, insecticides, and herbicides, usually in solution, to plants. It may be accomplished by various means, e.g., the watering can, sprinkler attach...

spark chamber

(Encyclopedia)spark chamber, in physics, device for recording the passage of elementary particles produced by reactions in a particle accelerator. Particles pass through a stack of metal plates or wire grids that a...

Carlsson, Arvid

(Encyclopedia)Carlsson, Arvid, 1923–2018, Swedish pharmacologist, grad. Univ. of Lund, Sweden, (M.D., Ph.D., 1951). Carlsson was a professor at the Univ. of Lund (1951–59) and at the Univ. of Gothenburg, Sweden...

Eaton, Dorman Bridgman

(Encyclopedia)Eaton, Dorman Bridgman, 1823–99, American reformer, b. Hardwick, Vt. He was a law partner of William Kent in New York City. His major interests were reform in municipal administration and abolition ...

breeding

(Encyclopedia)breeding, in agriculture and animal husbandry, propagation of plants and animals by sexual reproduction; usually based on selection of parents with desirable traits to produce improved progeny. In con...