By John Daintith and Elizabeth Martin (Editors)
Hailed as "handy and readable" (Nature) and "well worthy looking" (New Scientist), this best-selling dictionary comprises 9,200 alphabetically prepared entries on all facets of chemistry, physics, biology (including human biology), earth sciences, and astronomy. as well as a wealth of trustworthy, up to date entries, clients will locate precious brief biographies of best scientists, full-page illustrated beneficial properties on topics reminiscent of the sunlight process and Genetically changed Organisms, and chronologies of particular clinical matters together with plastics, electronics, and mobilephone biology. This re-creation comprises accelerated insurance of world warming, forensic technological know-how, astrophysics, quantum idea, and the sunlight process. Supported by means of over 2 hundred diagrams and illustrations, the Dictionary of technological know-how additionally comprises suggested net hyperlinks for lots of entries, accessed and stored brand new through the spouse site. ultimately, it has appendices on SI devices, primary constants, geological time scale, a simplified category of the plant and animal kingdoms, and the periodic desk. either concise and wide-ranging, this quantity is a perfect reference paintings for college kids or for a house library.
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Hailed as "handy and readable" (Nature) and "well worthy shopping" (New Scientist), this best-selling dictionary includes 9,200 alphabetically geared up entries on all elements of chemistry, physics, biology (including human biology), earth sciences, and astronomy. as well as a wealth of trustworthy, up to date entries, clients will locate precious brief biographies of top scientists, full-page illustrated good points on matters corresponding to the sun process and Genetically transformed Organisms, and chronologies of particular clinical topics together with plastics, electronics, and mobilephone biology.
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Extra info for A Dictionary of Science, Sixth Edition (Oxford Paperback Reference)
Amphetamine A drug, 1-phenyl-2-aminopropane (or a derivative of this compound), that stimulates the central nervous system by causing the release of the transmitters noradrenaline and dopamine from nerve endings. It inhibits sleep, suppresses the amplitude 39 appetite, and has variable effects on mood; prolonged use can lead to addiction. Amphibia The class of vertebrate chordates (see C) that contains the frogs, toads, newts, and salamanders. The amphibians evolved in the Devonian period (about 370 million years ago) as the Ürst vertebrates to occupy the land, and many of their characteristics are adaptations to terrestrial life.
Most amphiboles are monoclinic, including: cummingtonite, (Mg,Fe2+)7(Si8O22)(OH)2; tremolite, Ca2Mg5(Si8O22)(OH,F)2; actinolite, Ca2(Mg,Fe2+)5(Si8O22)(OH,F)2; *hornblende, NaCa2(Mg,Fe2+,Fe3+,Al)5((Si,Al)8O22) (OH,F)2; edenite, NaCa2(Mg,Fe2+)5(Si7AlO22)(OH,F)2; riebeckite, Na2,Fe32+(Si8O22)(OH,F)2. The minerals anthophyllite, (Mg,Fe2+)7(Si8O22)(OH,F)2, and gedrite, (Mg,Fe2+)6Al(Si,Al)8O22)(OH,F)2, are orthorhombic amphiboles. amphimixis True sexual reproduction, involving the fusion of male and female gametes and the formation of a zygote.
M. Ampère. Ampère, André Marie (1775–1836) French physicist who from 1809 taught at the Ecole Polytechnique in Paris. He is best known for putting electromagnetism (which 38 he called ‘electrodynamics’) on a mathematical basis. In 1825 he formulated *Ampère’s law. The *ampere is named after him. ampere-hour A practical unit of electric charge equal to the charge Ûowing in one hour through a conductor passing one ampere. It is equal to 3600 coulombs. Ampère’s law A law of the form dB = (µo I sin θ dl)/4πr2, where dB is the inÜnitesimal element of the magnitude of the magnetic Ûux density at a distance r at a point P from the element length dl of a conductor, µo is the magnetic *permeability of free space, I is the current Ûowing through the conductor, and θ is the angle between the direction of the current and the line joining the element of the conductor and P.