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Røros

(Encyclopedia)Røros röˈrōs [key], town (1995 est. pop. 5,400), Sør-Trøndelag co., E Norway, near the Swedish border. It is a tourist spot and a winter sports center. The copper mines in the vicinity, opened i...

Zewail, Ahmed Hassan

(Encyclopedia)Zewail, Ahmed Hassan, 1946–2016, Egyptian-American chemist, b. Damanhur, Egypt, Ph.D. Univ. of Pennsylvania, 1974. He became a U.S. citizen in 1982. A professor at the California Institute of Techno...

nucleus, in physics

(Encyclopedia)nucleus, in physics, the extremely dense central core of an atom. Following the discovery of radioactivity by A. H. Becquerel in 1896, Ernest Rutherford identified two types of radiation given off b...

phosphorus

(Encyclopedia)phosphorus fŏsˈfərəs [key] [Gr.,=light-bearing], nonmetallic chemical element; symbol P; at. no. 15; at. wt. 30.97376; m.p. 44.1℃; b.p. about 280℃; sp. gr. 1.82 at 20℃; valence −3, +3, or ...

Mufulira

(Encyclopedia)Mufulira mo͞ofo͞olēˈrä [key], city (1990 pop. 152,944), N central Zambia, on the border with the Congo. It is a copper-mining center, located in the Copperbelt. ...

electrode

(Encyclopedia)electrode, terminal through which electric current passes between metallic and nonmetallic parts of an electric circuit. In most familiar circuits current is carried by metallic conductors, but in som...

Erzgebirge

(Encyclopedia)Erzgebirge ĕrtsˈgəbĭrˌgə [key] [Ger.,=ore mountains], Czech Krušné Hory, mountain range, along the Czech–German border, extending c.95 mi (150 km) from the Fichtelgebirge in the southwest to...

protein

(Encyclopedia)protein, any of the group of highly complex organic compounds found in all living cells and comprising the most abundant class of all biological molecules. Protein comprises approximately 50% of cellu...

Chain, Ernst Boris

(Encyclopedia)Chain, Ernst Boris, 1906–79, English biochemist, b. Berlin, Germany. In 1933 he left Germany and went to England, where he conducted research at Cambridge from 1933 to 1935 and at Oxford from 1935; ...

Onsager, Lars

(Encyclopedia)Onsager, Lars, 1903–76, American physical chemist, b. Oslo, Ph.D. Yale, 1935. Onsager taught at Brown Univ. from 1928 to 1933 and was on the faculty at Yale from 1933 until his retirement in 1972. H...