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Olitski, Jules

(Encyclopedia)Olitski, Jules ŏlĭtˈskē [key], 1922–2006, American painter, b. Russia as Jevel Demikovsky. While considered a color-field painter (see color-field painting), Olitski produced works that are free...

photochemistry

(Encyclopedia)photochemistry, study of chemical processes that are accompanied by or catalyzed by the emission or absorption of visible light or ultraviolet radiation. A molecule in its ground (unexcited) state can...

Hearn, Lafcadio

(Encyclopedia)Hearn, Lafcadio lăfkäˈdēō hûrn [key], 1850–1904, American-Japanese author, b. Lefkás, Ionian Islands, of Irish-Greek parentage. After a difficult childhood, he was educated in Ireland, Englan...

gonorrhea

(Encyclopedia)gonorrhea gŏnərēˈə [key], common infectious disease caused by a bacterium (Neisseria gonorrhoeae), involving chiefly the mucous membranes of the genitourinary tract. It may occasionally spread to...

black fly

(Encyclopedia)black fly, name for any of the flies of the family Simuliidae. The black fly is about 1⁄8 in. (3.2 mm) long and has large eyes, short legs, a stout, humped back, broad gauzy wings, and piercing-suck...

Lippman, Gabriel Jonas

(Encyclopedia)Lippman, Gabriel Jonas, 1845–1921, French physicist, Ph.D. Sorbonne, 1875. He was a professor at the Sorbonne from 1883 until his death in 1921. Lippman received the 1908 Nobel Prize in Physics for ...

bead test

(Encyclopedia)bead test, test used in the identification of certain metals. Some metallic ions that cannot be identified by a flame test are identified by a bead test. The test can also be used to confirm the resul...

olivine

(Encyclopedia)olivine ŏlĭvˈēn [key], an iron-magnesium silicate mineral, (Mg,Fe)2SiO4, crystallizing in the orthorhombic system. It is a common constituent of magnesium-rich, silica-poor igneous rocks; metamorp...

Tibetan terrier

(Encyclopedia)Tibetan terrier, breed of medium-sized dog originating in Tibet probably several thousand years ago. It stands from 14 to 16 in. (35.6–40.6 cm) high at the shoulder and weighs from 15 to 30 lb (6.8�...

Diebenkorn, Richard

(Encyclopedia)Diebenkorn, Richard, 1922–93, American painter, b. Portland, Oreg. Raised in California, he studied at Stanford and at a collector's home encountered (1943) the work of Matisse, whose bold use of co...