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mixture

(Encyclopedia)mixture, in chemistry, a physical combination of two or more pure substances (i.e., elements or compounds). A mixture is distinguished from a compound, which is formed by the chemical combination of t...

lipoprotein

(Encyclopedia)lipoprotein lĭpˌəprōˈtēn [key], any organic compound that is composed of both protein and the various fatty substances classed as lipids, including fatty acids and steroids such as cholesterol. ...

complementarity principle

(Encyclopedia)complementarity principle, physical principle enunciated by Niels Bohr in 1928 stating that certain physical concepts are complementary. If two concepts are complementary, an experiment that clearly i...

Evatt, Herbert Vere

(Encyclopedia)Evatt, Herbert Vere vĭr ĕvˈət [key], 1894–1965, Australian statesman. He became (1940) a Labor member of the House of Representatives, before being appointed (1941) attorney general and then min...

Parisi, Giorgio

(Encyclopedia)Parisi, Giorgio, 1948–, Italian physicist, Ph.D. Sapienza University of Rome, 1970. Parisi is Professor of Theoretical Physics at Sapienza University....

Kusch, Polykarp

(Encyclopedia)Kusch, Polykarp, 1911–93, American physicist, b. Blankenburg, Germany, Ph.D. Univ. of Illinois, 1936. Kusch was a researcher, professor, and administrator at Columbia from 1937 to 1972 and a profess...

Born, Max

(Encyclopedia)Born, Max, 1882–1970, British physicist, b. Germany, Ph.D. Univ. of Göttingen, 1907. He was head of the physics department at the Univ. of Göttingen from 1921 to 1933. When Nazi policies forced hi...

Christopher, Saint

(Encyclopedia)Christopher, Saint krĭsˈtəfər [key] [Gr.,=Christ bearer], 3d cent.?, martyr of Asia Minor. His characteristic legend is that one day when he was carrying a little child over a river, he felt the c...

ambergris

(Encyclopedia)ambergris ămˈbərgrēs [key], waxlike substance originating as a morbid concretion in the intestine of the sperm whale. Lighter than water, it is found floating on tropical seas or cast up on the sh...

Achilles' tendon

(Encyclopedia)Achilles' tendon (tendo calcaneus) tĕnˈdō kălkāˈnēəs [key], sinew prominent at the back of the ankle, connecting the tendons of the calf muscles to the heelbone. When the musculature contracts...