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cyclopropane

(Encyclopedia)cyclopropane, C3H6, a gaseous hydrocarbon. It is a cyclic alkane, its three carbon atoms being joined together in a ring. The angle between successive carbon-carbon bonds in the ring is only 60°, muc...

epithelium

(Encyclopedia)epithelium ĕpˌəthēˈlēəm [key], sheet of tissue that covers or lines the external and internal body surfaces. The epithelium is closely packed, has little intercellular material, and is lacking ...

intoxication

(Encyclopedia)intoxication, condition of body tissue affected by a poisonous substance. Poisonous materials, or toxins, are to be found in heavy metals such as lead and mercury, in drugs, in chemicals such as alcoh...

McCarthy, Cormac

(Encyclopedia)McCarthy, Cormac, 1933–2023, American novelist, b. Providence, R.I. He grew up in Knoxville, Tenn., moved to the Southwest in 1974, and since then mai...

kwashiorkor

(Encyclopedia)kwashiorkor kwăshˌēôrˈkôr [key], protein deficiency disorder of children. It is prevalent in overpopulated parts of the world where the diet consists mainly of starchy vegetables, particularly i...

l-dopa

(Encyclopedia)l-dopa ĕl-dōˈpə [key], drug used to alleviate some of the symptoms of Parkinson's disease, particularly trembling, rigidity, and slow movements; the drug is also called levodopa. Parkinson's disea...

Leeuwenhoek, Antony van

(Encyclopedia)Leeuwenhoek, Antony van änˈtōnē vän lāˈvənho͞okˌ [key], 1632–1723, Dutch student of natural history and maker of microscopes, b. Delft. His use of lenses in examining cloth as a draper's a...

Bergström, Sune Karl

(Encyclopedia)Bergström, Sune Karl so͞oˈnə, bĕrˈyəström [key], 1916–2004, Swedish biochemist, grad. Karolinska Institute (Ph.D., M.D., 1944). With his former pupil B. I. Samuelsson and John R. Vane, he wa...

Ratcliffe, Sir Peter John

(Encyclopedia)Ratcliffe, Sir Peter John, 1954–, British cellular and molecular biologist, M.D., Cambridge, 1987. He has been a researcher at Oxford since 1987. Ratcliffe, along with William Kaelin and Gregg Semen...

Steinman, Ralph Marvin

(Encyclopedia)Steinman, Ralph Marvin, 1943–2011, Canadian biologist, M.D. Harvard Medical School, 1968. He was a researcher and professor at Rockefeller Univ., New York City, from 1970 until his death in 2011. St...