By John Daintith
This best-selling dictionary includes over 9,000 entries on all features of technology and gives accomplished 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 type. New positive aspects contain digital thumb tags for simple reference, increased components together with astronomy and earth technological know-how and extra beneficial properties on key subject matters reminiscent of the sun method and Genetically transformed Organisms. additionally featured are brief biographies of top scientists and chronologies of particular topics, together with plastics, electronics and mobilephone biology. either concise and wide-ranging, this dictionary is a perfect convenient reference paintings and nice creation for college kids and non-scientists alike.
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Additional info for A Dictionary of Science, Fifth Edition
Anchor ring See torus. 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).
Amines are produced by the decomposition of organic matter. They can be made by reducing nitro compounds or amides. See also imines. amine salts Salts similar to ammonium salts in which the hydrogen atoms attached to the nitrogen are replaced by one or more organic groups. Amines readily form salts by reaction with acids, gaining a proton to form a positive ammonium ion, They are named as if they were substituted derivatives of ammonium compounds; for example, dimethylamine ((CH3)2NH) will react with hydrogen chloride to give dimethylammonium chloride, which is an ionic compound [(CH3)2NH2]+Cl–.
Allergy A condition in which the body produces an abnormal *immune response to certain *antigens (called allergens), which include dust, pollen, certain foods and drugs, or fur. g. asthma or hay fever). See also anaphylaxis; mast cells. allogamy Cross-fertilization in plants. See fertilization. allograft See graft. allometric growth The regular and systematic pattern of growth such that 26 the mass or size of any organ or part of a body can be expressed in relation to the total mass or size of the entire organism according to the allometric equation: Y = bxα, where Y = mass of the organ, x = mass of the organism, α = growth coefÜcient of the organ, and b = a constant.
A Dictionary of Science, Fifth Edition by John Daintith