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Shirakawa, Hideki

(Encyclopedia)Shirakawa, Hideki, 1936–, Japanese chemist, Ph.D. Tokyo Institute of Technology, 1966. Shirakawa was a research assistant at the Tokyo Institute of Technology from 1966 to 1979. He then taught at th...

chelating agents

(Encyclopedia)chelating agents kēˈlātĭng [key]. Certain organic compounds are capable of forming coordinate bonds (see chemical bond) with metals through two or more atoms of the organic compound; such organic ...

Irkutsk

(Encyclopedia)Irkutsk ĭrko͞otskˈ [key], city (1989 pop. 626,000), capital of Irkutsk region, S Siberian Russia, at the confluence of the Angara and Irkut rivers. It is an industrial center, a port, the site of a...

baths

(Encyclopedia)baths, in architecture. Ritual bathing is traceable to ancient Egypt, to prehistoric cities of the Indus River valley, and to the early Aegean civilizations. Remains of bathing apartments dating from ...

Swansea, city and county, Wales

(Encyclopedia)Swansea swŏnˈzē, –sē [key], Welsh Abertawe, city (1981 pop. 172,433) and county, 146 sq mi (378 sq km), S Wales. Located on Swansea Bay at the mouth of the Tawe River, the city of Swansea is a m...

Brest, city, France

(Encyclopedia)Brest brĕst [key], city, Finistère dept., NW France, on an inlet of the Atlantic Ocean. It ...

cobalt, chemical element

(Encyclopedia)cobalt, metallic chemical element; symbol Co; at. no. 27; at. wt. 58.9332; m.p. 1,495℃; b.p. about 2,870℃; sp. gr. 8.9 at 20℃; valence +2 or +3. Cobalt is a silver-white, lustrous, hard, brittle...

lead, chemical element

(Encyclopedia)lead, metallic chemical element; symbol Pb [Lat. plumbum]; at. no. 82; at. wt. 207.2; m.p. 327.502℃; b.p. about 1,740℃; sp. gr. 11.35 at 20℃; valence +2 or +4. One of the oldest metals used by h...

Meaux

(Encyclopedia)Meaux mō [key], city (1990 pop. 49,409), Seine-et-Marne dept., N France, in Brie, on the Marne River. It is an industrial center where metals, flour, chemicals, and foodstuffs are produced. An episco...

rosin

(Encyclopedia)rosin or colophony, hard, brittle, translucent resin, obtained as a solid residue from crude turpentine. Usually pale yellow or amber, its color may vary from brownish-black to transparent depending o...