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endorphins

(Encyclopedia)endorphins ĕndôrˈfĭnz [key], neurotransmitters found in the brain that have pain-relieving properties similar to morphine. There are three major types of endorphins: beta endorpins, found primaril...

embolus

(Encyclopedia)embolus ĕmˈbələs [key], foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis), a bubble of gas o...

Malpighi, Marcello

(Encyclopedia)Malpighi, Marcello märchĕlˈlō mälpēˈgē [key], 1628–94, Italian anatomist. A pioneer in the use of the microscope, he made many valuable observations on the structure of plants and animals. H...

Lehn, Jean-Marie

(Encyclopedia)Lehn, Jean-Marie zhäNˈ-märēˈ lĕN [key], 1939–, French chemist, Ph.D. Univ. of Strasbourg, 1963. A professor at Louis Pasteur Univ. (1970–78) and the Collège de France (1979–), Lehn did gr...

Tugwell, Rexford Guy

(Encyclopedia)Tugwell, Rexford Guy, 1891–1979, American economist and political scientist, b. Chautauqua co., N.Y., grad. Wharton School, Univ. of Pennsylvania (B.S., 1915; Ph.D., 1922). He taught economics at th...

Steno, Nicolaus

(Encyclopedia)Steno, Nicolaus nēls stānˈsən [key], 1638–86, Danish anatomist, geologist, and Roman Catholic prelate. He lived principally in Copenhagen, Paris, and Florence. He investigated the heart, brain, ...

touch

(Encyclopedia)touch, tactile sensation received by the skin, enabling the organism to detect objects or substances in contact with the body. End organs (nerve endings) in the skin convey the impression to the brain...

Schneiderman, Rose

(Encyclopedia)Schneiderman, Rose shnīˈdərmən [key], 1884–1972, American labor leader, b. Poland. She emigrated to the United States in 1890. After working as a lining stitcher in a cap factory, she was instru...

spastic paralysis

(Encyclopedia)spastic paralysis, form of paralysis in which the part of the nervous system that controls coordinated movement of the voluntary muscles is disabled. In spastic paralysis the nerves controlling muscle...

speech defect

(Encyclopedia)speech defect, any condition that interferes with the mental formation of words or their physical production. Speech defects in children generally become apparent in the early school years. Speech pro...