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Mount Vernon, estate, United States

(Encyclopedia)Mount Vernon, NE Va., overlooking the Potomac River near Alexandria, S of Washington, D.C.; home of George Washington from 1747 until his death in 1799. The land was patented in 1674, and the house wa...

molecular orbital theory

(Encyclopedia)molecular orbital theory, detailed explanation of how electrons are distributed in stable molecules. In the simpler valence theory of the chemical bond, each atom in a molecule is assumed to retain it...

mesoderm

(Encyclopedia)mesoderm, in biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a hollow ball. Con...

nitrocellulose

(Encyclopedia)nitrocellulose, nitric acid ester of cellulose (a glucose polymer). It is usually formed by the action of a mixture of nitric and sulfuric acids on purified cotton or wood pulp. The extent of nitratio...

pack rat

(Encyclopedia)pack rat, rodent of the genus Neotoma, of North and Central America, noted for its habit of collecting bright, shiny objects and leaving other objects, such as nuts or pebbles, in their place; also ca...

Krasznahorkai, Lázló

(Encyclopedia)Krasznahorkai, Lázló, 1954–, Hungarian writer known for his strange, bleak, obsessive, and surreal novels, short stories, and film scripts. Usually marked by grim rural settings, and often featuri...

maltose

(Encyclopedia)maltose môlˈtōs [key] or malt sugar, crystalline disaccharide (see carbohydrate). It has the same empirical formula (C12H22O11) as sucrose and lactose but differs from both in structure (see isomer...

Madeleine

(Encyclopedia)Madeleine mădˈəlĭn, Fr. mädlĕnˈ [key] [Fr.,=Magdalen, i.e., Mary Magdalen], large church of Paris, in the Place de la Madeleine. It was originally planned by J. A. Gabriel as a part of his layo...

Kendall, Edward Calvin

(Encyclopedia)Kendall, Edward Calvin, 1886–1972, American biochemist, b. South Norwalk, Conn., grad. Columbia (B.S., 1908; Ph.D., 1910). At St. Luke's Hospital, New York City, he did research on the thyroid gland...

Liu Shaoqi

(Encyclopedia)Liu Shaoqi or Liu Shao-ch'i both: lyo͞o shou-chē [key], 1898?–1969, Chinese Communist political leader. Liu joined (1920) a Comintern organization in Shanghai, where he studied Russian. While in M...