Download e-book for iPad: A Dictionary of Science (5th Edition) by John Daintith

By John Daintith

ISBN-10: 0192806416

ISBN-13: 9780192806413

This best-selling dictionary comprises over 9,000 entries on all features of technology and gives entire assurance of biology (including human biology), chemistry, physics, the earth sciences, and astronomy. Appendices hide the periodic desk, geological time scale, and animal and plant category. New gains contain digital thumb tags for simple reference, increased parts together with astronomy and earth technology and extra gains on key subject matters corresponding to the sunlight method and Genetically changed Organisms. additionally featured are brief biographies of best scientists and chronologies of particular matters, together with plastics, electronics and mobile 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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Extra info for A Dictionary of Science (5th Edition)

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Salts formed by amines are crystalline substances that are readily soluble in water. g. quinine and atropine) are used medicinally in the form of soluble salts (‘hydrochlorides’). If alkali (sodium hydroxide) is added to solutions of such salts the free amine is liberated. If all four hydrogen atoms of an ammonium salt are replaced by organic groups a quaternary ammonium compound is formed. Such compounds are made by reacting tertiary amines with halogen compounds; for example, trimethylamine ((CH3)3N) with chloromethane (CH3Cl) gives tetramethylammonium chloride, (CH3)4N+Cl–.

Ames test (Salmonella mutagenesis test) A test to determine the effects of a chemical on the rate of mutation in bacterial cells, and hence its likely potential for causing cancer in other organisms, including humans. Devised by US biologist Bruce Ames (1928– ), it is widely used in 32 screening chemicals occurring in the environment for possible carcinogenic activity. The chemical is applied to plates inoculated with a special mutant strain of bacteria, usually Salmonella typhimurium, and cells that mutate back to the wild type are detected by the occurrence of colonies able to grow on the medium.

AND circuit See logic circuits. Anderson, Carl David (1905–91) US physicist who became a professor at the California Institute of Technology, where he worked mainly in particle physics. In 1937 he discovered the *positron in *cosmic radiation, and four years later was awarded the Nobel Prize. In 1939 he discovered the mu-meson (muon). androecium The male sex organs (*stamens) of a Ûower. Compare gynoecium. androgen One of a group of male sex hormones that stimulate development of the testes and of male *secondary sexual characteristics (such as growth of facial and pubic hair in men).

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


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