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cork, in botany

(Encyclopedia)cork, protective, waterproof outer covering of the stems and roots of woody plants. Cork is a specialized secondary tissue produced by the cork cambium of the plant (see meristem, bark). The regularly...

Lewis, Sir Arthur

(Encyclopedia)Lewis, Sir Arthur (Sir William Arthur Lewis), 1915–91, British economist, b. St. Lucia. A graduate (1940) of the London School of Economics, he was later a professor of economics at the Univ. of Man...

Viner, Jacob

(Encyclopedia)Viner, Jacob, 1892–1970, American economist, b. Montreal. He taught at the Univ. of Chicago (1919–46) and Princeton (1946–60). A specialist on the subject of international trade, Viner was an ad...

Haber process

(Encyclopedia)Haber process häˈbər [key], commercial process for the synthesis of ammonia, NH3. Pure hydrogen and nitrogen gases are mixed in the appropriate proportion, heated to between 450℃ and 600℃, comp...

excretion

(Encyclopedia)excretion, process of eliminating from an organism waste products of metabolism and other materials that are of no use. It is an essential process in all forms of life. In one-celled organisms wastes ...

Crenshaw, Kimberlé Williams

(Encyclopedia)Crenshaw, Kimberlé, 1959–, American legal scholar and critical race theorist, b. Canton, Ohio, J.D. Harvard University, 1984. An influential writer o...

valve

(Encyclopedia)valve, device for controlling the flow of fluids (liquids and gases). Valves vary in construction and size depending upon their function. Some are classified according to their method of operation or ...

Kekulé von Stradonitz, Friedrich August

(Encyclopedia)Kekulé von Stradonitz, Friedrich August frēˈdrĭkh ouˈgo͝ost kāˈko͞olā fən shträˈdōnĭts [key], 1829–96, German organic chemist. He was professor at Ghent (1858–65) and at Bonn from 1...

Hurwicz, Leonid

(Encyclopedia)Hurwicz, Leonid hûrˈwĭch [key], 1917–2008, Polish-American economist and statistician, b. Russia., grad. Univ. of Warsaw, 1938. Educated in the law, he subsequently studied economics in London, G...

Haas, Arthur Erich

(Encyclopedia)Haas, Arthur Erich häs [key], 1884–1941, American physicist and educator, b. Bohemia. He was professor of physics at Vienna, Leipzig, London, and, from 1936, the Univ. of Notre Dame, South Bend, In...