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centrifuge
centrifuge , device using centrifugal force to separate two or more substances of different density, e.g., two liquids or a liquid and a solid. The centrifuge consists of a fixed base or frame and a rotating part in which the mixture is placed and then spun at high speed. One type is used for the... Read more |
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cantilever
cantilever , beam supported rigidly at one end to carry a load along the free arm or at the free end. A slanting beam fixed at the base is often used to support the free end, as in a common bracket. The springboard is a simple cantilever beam, and the cantilever design is often used for canopies,... Read more |
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ratchet and pawl
ratchet and pawl mechanical device that permits motion in one direction only. The ratchet is usually a wheel with slanting teeth. The pawl is a lever tangential to the wheel with one end resting on the teeth. When the wheel rotates one way, the pawl slides over the teeth; when the wheel rotates the... Read more |
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Aurora (newspaper)
AURORA AURORA. Founded in 1790 as the General Advertiser by Benjamin Franklin's grandson, Benjamin Franklin Bache, this Philadelphia newspaper was the most important political journal of its era. After Philip Freneau's National Gazette folded in 1793, Bache's journal became the nation's leading... Read more |
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Palenque
Palenque , ancient city of the Maya in Chiapas, S Mexico, in the Usumacinta Valley. Its architectural elegance, adapted to tropical and topographical conditions, was a high point in the art of the Classic period. Stucco sculpturing and low-relief paneling reached their highest expression at... Read more |
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Formulas for Various Areas
Formulas for Various Areas Formulas for Various Areas The abbreviations used are: b = base (length of any side of a plane figure); a = altitude (perpendicular distance from the farthest point of the figure to the extended base); s = side; r... Read more |
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Plagioclases
Plagioclase Plagioclase is a form of the mineral feldspar . All feldspars are crystals of aluminum, oxygen , and silicon , plus a major additive. In the case of plagioclase, the additive is calcium, sodium, or a blend of both. Miscellaneous impurities may also be present. Like other... Read more |
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Downs syndrome
Down's syndrome (downz) n. a condition resulting from a chromosomal abnormality, most commonly the presence of three no. 21 chromosomes (instead of the usual two), which is more likely to occur with advanced maternal age. Affected individuals share certain clinical features, including a... Read more |
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Down syndrome
Down syndrome congenital disorder characterized by mild to severe mental retardation , slow physical development, and characteristic physical features. Down syndrome affects about 1 in every 730 live births and occurs in all populations equally. It was first described in 1866 by an English... Read more |
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Anatole France
Anatole France , pseud. of Jacques Anatole Thibault , 1844-1924, French writer. He was probably the most prominent French man of letters of his time. Among his best-remembered works is L'Île des pingouins (1908, tr. Penguin Island, 1909), an allegorical novel satirizing French history.... Read more |
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