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precipitation, in chemistry

(Encyclopedia)precipitation, in chemistry, a process in which a solid is separated from a suspension, sol, or solution. In a suspension such as sand in water the solid spontaneously precipitates (settles out) on st...

Ballinger, Richard Achilles

(Encyclopedia)Ballinger, Richard Achilles bălˈĭnjər [key], 1858–1922, U.S. Secretary of the Interior (1909–11), b. Boonesboro (now in Boone), Iowa. He was mayor of Seattle (1904–6) and commissioner of the...

Balbus

(Encyclopedia)Balbus (Lucius Cornelius Balbus) bălˈbəs [key], fl. 1st cent. b.c., Roman statesman, b. Gades (now Cádiz, Spain). He won notice for brilliant service against Sertorius, and Pompey brought him to R...

Olah, George Andrew

(Encyclopedia)Olah, George Andrew, 1927–2017, American chemist, b. Budapest, Ph.D. Budapest Univ. of Technology and Economics, 1949. Olah was a researcher at Dow Chemical from 1957 to 1965 and a professor at West...

Nečas, Petr

(Encyclopedia)Nečas, Petr pĕtˈər nĕˈchäs [key], 1964–, Czech politician. Trained as a physicist, he graduated (1988) from Brno's Uherske Science Univ. and taught (1983–88) at Masaryk Univ., Brno. After w...

Wilson, J. Tuzo

(Encyclopedia)Wilson, J. Tuzo (John Tuzo Wilson), 1908–93, Canadian geologist and geophysicist, b. Ottawa, Ph.D. Princeton (1936), M.A. Cambridge (1940). He worked for the Geological Survey of Canada (1936–39) ...

Carranza de Miranda, Bartolomé de

(Encyclopedia)Carranza de Miranda, Bartolomé de bärtōlōmāˈ dā käränˈthä dā mēränˈdä [key], 1503–76, Spanish churchman. He joined the Dominicans (1520) and taught at Valladolid. He was active in th...

Bradlaugh, Charles

(Encyclopedia)Bradlaugh, Charles brădˈlô [key], 1833–91, British social reformer, a secularist. Editor of the free-thinking weekly National Reformer from 1860 and later associated with Annie Besant, he was an ...

Sutherland, George

(Encyclopedia)Sutherland, George, 1862–1942, associate justice of the U.S. Supreme Court (1922–38), b. Buckinghamshire, England. He was taken by his family to Springville, Utah from England in 1864. After study...

spinal puncture

(Encyclopedia)spinal puncture, surgical penetration of the spinal canal by a hollow needle introduced between two of the lumbar vertebrae. The arrangement permits injection of antibiotics or anesthetics (see anesth...