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Schrock, Richard Royce

(Encyclopedia)Schrock, Richard Royce, 1945–, American chemist, b. Berne, Ind., Ph.D Harvard, 1971. After working for three years with the Dupont Company, he became (1972) a professor at the Massachusetts Institut...

Chen Duxiu

(Encyclopedia)Chen Duxiu or Ch'en Tu-hsiu both: chŭn do͞o-shyo͞o [key], 1879–1942, Chinese educator and Communist party leader. He was active in the republican revolution of 1911 and was forced to flee to Japa...

Tupinambá

(Encyclopedia)Tupinambá, a people living in the eastern lowland area of South America, related to the Tupí of the Rio São Francisco and the Guaraní of Paraguay and adjacent portions of Brazil and Argentina. Alt...

radical, in chemistry

(Encyclopedia)radical, in chemistry, group of atoms that are joined together in some particular spatial structure and that take part in most chemical reactions as a single unit. Important inorganic radicals include...

distribution

(Encyclopedia)distribution, in economics, the allocation of a society's total wealth among various economic groups. Distribution, in that sense, does not refer to the physical marketing or circulation of goods, whi...

hemophilia

(Encyclopedia)hemophilia hēˌməfĭlˈēə, –fēlˈyə [key], genetic disease in which the clotting ability of the blood is impaired and excessive bleeding results. The disease is transmitted through females but...

Hales, Stephen

(Encyclopedia)Hales, Stephen, 1677–1761, English physiologist and clergyman. From 1709 he was perpetual curate of Teddington. His experimental studies in animal and plant physiology contributed greatly to the pro...

Minot, George Richards

(Encyclopedia)Minot, George Richards mīˈnət [key], 1885–1950, American physician and pathologist, b. Boston, M.D. Harvard, 1912. From 1928 to 1948 he was professor of medicine at Harvard and director of the Th...

sarcoma

(Encyclopedia)sarcoma särkōˈmə [key], highly malignant tumor arising in connective- and muscle-cell tissue. It is the result of oncogenes (the cancer causing genes of some viruses) and proto-oncogenes (cancer c...

ephedrine

(Encyclopedia)ephedrine ĭfĕdˈrĭn, ĕfˈĭdrēnˌ [key], drug derived from plants of the genus Ephedra (see Pinophyta), most commonly used to prevent mild or moderate attacks of bronchial asthma. Unlike epinephr...