Columbia Encyclopedia

Search results

500 results found

Schekman, Randy Wayne

(Encyclopedia)Schekman, Randy Wayne, 1948–, American cell biologist, b. St. Paul, Minn. Ph.D. Stanford, 1974. He is a professor (since 1976) at the Univ. of California, Berkeley, and an investigator of the Howard...

Pinyin

(Encyclopedia)Pinyin pĭnˈyĭnˈ [key] [Chin. Hanyu pinyin = Chinese phonetic alphabet], system of romanization of Chinese written characters, approved in 1958 by the government of the People's Republic of Chi...

Raiffeisen, Friedrich Wilhelm

(Encyclopedia)Raiffeisen, Friedrich Wilhelm frēˈdrĭkh vĭlˈhĕlm rīfˈīˌzən [key], 1818–88, German leader in the cooperative movement. Between 1845 and 1865 he was mayor of several German towns. After the...

Veterans Affairs, United States Department of

(Encyclopedia)Veterans Affairs, United States Department of, federal executive department established to operate programs to benefit veterans and their families. The department was established in 1989; its predeces...

momentum

(Encyclopedia)momentum mōmĕnˈtəm [key], in mechanics, the quantity of motion of a body, specifically the product of the mass of the body and its velocity. Momentum is a vector quantity; i.e., it has both a magn...

Lorentz contraction

(Encyclopedia)Lorentz contraction lôrˈĕnts [key], in physics, contraction or foreshortening of a moving body in the direction of its motion, proposed by H. A. Lorentz on theoretical grounds and based on an earli...

Murchison, Sir Roderick Impey

(Encyclopedia)Murchison, Sir Roderick Impey mûrˈkĭsən [key], 1792–1871, British geologist. He served in the Napoleonic Wars but after the peace turned his attention to science. In the 1830s he undertook the i...

heroin

(Encyclopedia)heroin hĕˈrəwən [key], opiate drug synthesized from morphine (see narcotic). Originally produced in 1874, it was thought to be not only nonaddictive but useful as a cure for respiratory illness an...

barcode

(Encyclopedia)CE5 Barcode barcode, computer coding system that uses a printed pattern of lines and bars to identify such things as products, mail and packages, and customer accounts; the term also is used for s...

epicycle

(Encyclopedia)epicycle: see Ptolemaic system.