By John Daintith

ISBN-10: 0192806416

ISBN-13: 9780192806413

This best-selling dictionary includes over 9,000 entries on all facets of technological know-how and gives accomplished insurance of biology (including human biology), chemistry, physics, the earth sciences, and astronomy. Appendices conceal the periodic desk, geological time scale, and animal and plant class. New beneficial properties contain digital thumb tags for simple reference, extended components together with astronomy and earth technology and extra gains on key themes akin to the sun procedure and Genetically transformed 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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Extra info for A Dictionary of Science, Fifth Edition

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D. p. p. 2607°C. Ten isotopes are known. The element was discovered by G. T. Seaborg and associates in 1945, who obtained it by bombarding uranium–238 with alpha particles. 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.

Aminotoluene See benzylamine. ammeter An instrument that measures electric current. The main types are the moving-coil ammeter, the moving-iron ammeter, and the thermoammeter. The ammine a moving-coil instrument is a moving-coil *galvanometer Ütted with a *shunt to reduce its sensitivity. c. by using a *rectiÜer. In moving-iron instruments, a piece of soft iron moves in the magnetic Üeld created when the current to be measured Ûows through a Üxed coil. c. c. but are less accurate (though more robust) than the moving-coil instruments.

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, Fifth Edition by John Daintith

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