A Dictionary of Science (5th Edition) by John Daintith

By John Daintith

This best-selling dictionary includes over 9,000 entries on all points of technological know-how and gives entire insurance of biology (including human biology), chemistry, physics, the earth sciences, and astronomy. Appendices disguise the periodic desk, geological time scale, and animal and plant category. New positive factors comprise digital thumb tags for simple reference, improved components together with astronomy and earth technology and extra good points on key themes akin to the sun process and Genetically converted Organisms. additionally featured are brief biographies of top scientists and chronologies of particular matters, together with plastics, electronics and mobilephone biology. either concise and wide-ranging, this dictionary is a perfect convenient reference paintings and nice advent for college kids and non-scientists alike.

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In *mitosis the chromatids of each chromosome move apart to opposite ends of the spindle. In the Ürst anaphase of *meiosis, the paired homologous chromosomes separate and move to opposite ends; in the second anaphase the chromatids move apart, as in mitosis. anaphylaxis An abnormal *immune response that occurs when an individual previously exposed to a particular *antigen is re-exposed to the same antigen. Anaphylaxis may follow an insect bite or the injection of a drug (such as penicillin). It is caused by the release of *histamine and similar substances and may produce a localized reaction or a more generalized and severe one, with difÜculty in breathing, pallor, or drop in blood pressure, unconsciousness, and possibly heart failure and death.

C. In the hot-wire instrument the wire is clamped at its ends and its elongation as it is heated causes a pointer to move over a scale. ammine A coordination *complex in which the ligands are ammonia molecules. An example of an ammine is the tetraamminecopper(II) ion [Cu(NH3)4]2+. d. p. p. 35°C. It is very soluble in water and soluble in alcohol. The compound may be prepared in the laboratory by reacting ammonium salts with bases such as calcium hydroxide, or by the hydrolysis of a nitride. Industrially it is made by the *Haber process and over 80 million tonnes per year are used either directly or in combination.

Allowed transitions See selection rules. g. g. steel is an alloy of iron and carbon, sometimes with other metals included). Alloys may be compounds, *solid solutions, or mixtures of the components. alloy steels See steel. alluvial deposits Sediments deposited in a river, which range in particle size from Üne silts to coarse gravels. allyl group See propenyl group. Alnico A trade name for a series of alloys, containing iron, aluminium, nickel, cobalt, and copper, used to make permanent magnets. alternating current alpha-iron See iron.

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