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acetylcholine
acetylcholine , a small organic molecule liberated at nerve endings as a neurotransmitter . It is particularly important in the stimulation of muscle tissue. The transmission of an impulse to the end of the nerve causes it to release neurotransmitter molecules onto the surface of the next cell, sti...
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Lassa fever
Lassa fever , a severe viral disease occurring mostly in W Africa, characterized by high fever, muscle aches, mouth ulcers, and bleeding in the skin. The disease was first recognized in Lassa, Nigeria, in 1969. The causative virus belongs to a group called arenaviruses and is harbored by a rat, Mas...
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salicylate
salicylate , any of a group of analgesics , or painkilling drugs, that are derivatives of salicylic acid. The best known is acetylsalicylic acid, or aspirin . Now often made synthetically, they were originally derived from salicin, the active ingredient in willow bark, used for centuries in the ...
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aerobics
aerobics , [Gr.,=with oxygen], system of endurance exercises that promote cardiovascular fitness by producing and sustaining an elevated heart rate for a prolonged period of time, thereby pumping an increased amount of oxygen-rich blood to the muscles being used. Such aerobic activities as running, ...
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Elizabeth Madox Roberts
Elizabeth Madox Roberts 1886-1941, American poet and novelist, b. Perryville, Ky., grad. Univ. of Chicago, 1921. She is best known for her novels and stories of the Kentucky mountain people, whose dialect and customs she carefully represented. All her work is distinguished by the beauty and rhythm ...
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heart attack
heart attack see under infarction .
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Richard Jefferies
Richard Jefferies , 1848-87, English author. A naturalist, he wrote several books about the English countryside. He first achieved recognition with the sketches The Gamekeeper at Home (1878). His novels include Wood Magic (1881) and Bevis (1882).
Bibliography: See his autobiography, Stor...
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Four-H
Four-H or 4-H, organization for boys and girls, generally from 8 to 18 years of age; some states offer programs for younger children, and there are also collegiate programs. 4-H teaches young people leadership, citizenship, and life skills through practical educational programs in animal and pl...
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Kenneth I
Kenneth I (Kenneth mac Alpin), d. 858, traditional founder of the kingdom of Scotland. He succeeded his father, Alpin, as king of Dalriada (the kingdom of the Gaelic Scots in W Scotland) and c.843 obtained the Pictish throne, thus establishing the nucleus of the kingdom of Scotland. Because of cont...
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Four-H clubs
Four-H clubs or 4-H clubs, organizations for boys and girls from 9 to 19 years of age. The group is part of an educational program designed to improve techniques of agriculture and home economics, promote high ideals of civic responsibility, provide training for community leadership, and foster...
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