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thallium

(Encyclopedia)thallium thălˈēəm [key], metallic chemical element; symbol Tl; at. no. 81; interval in which at. wt. ranges 204.382–204.385; m.p. 303.5℃; b.p. about 1,457℃; sp. gr. 11.85 at 20℃; valence +...

Crick, Francis Harry Compton

(Encyclopedia)Crick, Francis Harry Compton, 1916–2004, English scientist, grad. University College, London, and Caius College, Cambridge. Crick was trained as a physicist, and from 1940 to 1947 he served as a sci...

cryptosporidium

(Encyclopedia)cryptosporidium krĭpˌtōspərĭdˈēəm [key], genus of protozoans having at least four species; they are waterborne parasites that cause the disease cryptosporidiosis. One of the species appears to...

Chandrasekhar, Subrahmanyan

(Encyclopedia)Chandrasekhar, Subrahmanyan so͝obˌrəmänˈyən chŭnˌdrəsāˈkər [key], 1910–95, American astrophysicist, b. Lahore, India (now Pakistan). He became a professor at the Univ. of Chicago in 1938...

polyphony

(Encyclopedia)polyphony pəlĭfˈənē [key], music whose texture is formed by the interweaving of several melodic lines. The lines are independent but sound together harmonically. Contrasting terms are homophony, ...

populism

(Encyclopedia)populism, in politics, a movement or political strategy that purports to endorse the will of the common or ordinary people, especially when distinguished from and opposed to a corrupt political or eco...

paper nautilus

(Encyclopedia)paper nautilus or argonaut, pelagic, surface-dwelling cephalopod mollusk of the genus Argonauta. Like the closely related octopus, the paper nautilus has a rounded body, eight tentacles, and no fins. ...

Hodler, Ferdinand

(Encyclopedia)Hodler, Ferdinand hōdˈlər [key], 1853–1918, Swiss painter and lithographer. Known for his emotion-laden portraits and landscapes, he is particularly beloved in his native country. At first he wor...

hagfish

(Encyclopedia)hagfish, primitive, jawless marine fish of the family Myxinidae, of worldwide distribution in cold and temperate waters. Its rudimentary skeleton, of cartilage rather than bone, has a braincase, but n...

Steitz, Thomas Arthur

(Encyclopedia)Steitz, Thomas Arthur, 1940–2018, American biophysicist and biochemist, b. Milwaukee, Ph.D. Harvard, 1966. Steitz was a professor at Yale from 1970 and a researcher at the Howard Hughes Medical Inst...