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norepinephrine
(Encyclopedia) norepinephrinenorepinephrinenôrˌĕpīnĕfˈrən [key], a neurotransmitter in the catecholamine family that mediates chemical communication in the sympathetic nervous system, a branch of the…Louvois, François Michel Le Tellier, marquis de
(Encyclopedia) Louvois, François Michel Le Tellier, marquis deLouvois, François Michel Le Tellier, marquis defräNswäˈ mēshĕlˈ lə tĕlyāˈ märkēˈ də l&oomacr;vwäˈ [key], 1641–91, French statesman,…chaparral
(Encyclopedia) chaparralchaparralchăpərălˈ [key], type of plant community in which shrubs are dominant. It occurs usually in regions having from 10 to 20 in. (25–50 cm) of rainfall annually and with…electroscope
(Encyclopedia) electroscope, device for detecting electric charge invented by Nollet in 1748. There are various types of electroscopes. The most common has a cylindrical metal case closed by two…hydrology
(Encyclopedia) hydrology, study of water and its properties, including its distribution and movement in and through the land areas of the earth. The hydrologic cycle consists of the passage of water…harmonic
(Encyclopedia) harmonic. 1 Physical term describing the vibration in segments of a sound-producing body (see sound). A string vibrates simultaneously in its whole length and in segments of halves,…Rothschild, Nathan Meyer
(Encyclopedia) Rothschild, Nathan Meyer, 1777–1836, British banker, b. Frankfurt, Germany; of the famous Rothschild family. He went to England in 1797, was naturalized in 1804, and opened a business…coral snake
(Encyclopedia) coral snake, name for poisonous New World snakes of the same family as the Old World cobras. About 30 species inhabit Mexico, Central America, and N South America; two are found in the…Vasconcelos, José
(Encyclopedia) Vasconcelos, JoséVasconcelos, Joséhōsāˈ väskōnsāˈlōs [key], 1882–1959, Mexican educator and writer. He headed (1920–24) the National Univ. of Mexico and, as minister of education under…vibration
(Encyclopedia) vibration, in physics, commonly an oscillatory motion—a movement first in one direction and then back again in the opposite direction. It is exhibited, for example, by a swinging…Trending
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