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valence, in chemistry

(Encyclopedia)valence, combining capacity of an atom expressed as the number of single bonds the atom can form or the number of electrons an element gives up or accepts when reacting to form a compound. Atoms are c...

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...

Mudéjar

(Encyclopedia)Mudéjar mo͞oᵺāˈhär [key], name given to the Moors who remained in Spain after the Christian reconquest but were not converted to Christianity, and to the style of Spanish architecture and decor...

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 ...

Ramazzini, Bernardino

(Encyclopedia)Ramazzini, Bernardino bārnärdēˈnō rämät-tsēˈnē [key], 1633–1717, Italian physician. He was professor at Modena (1682–1700) and at Padua until 1714. He is often called the father of indus...

Reggio nell' Emilia

(Encyclopedia)Reggio nell' Emilia nĕlˌāmēˈlyä [key], city (1991 pop. 132,030), capital of Reggio nell' Emilia prov., in Emilia-Romagna, N central Italy, on the Aemilian Way. It is an agricultural and major in...

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 ...

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...