Get A Dictionary of Science (5th Edition) PDF
By John Daintith
ISBN-10: 0192806416
ISBN-13: 9780192806413
This best-selling dictionary includes over 9,000 entries on all points of technological know-how and offers finished assurance 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 beneficial properties contain digital thumb tags for simple reference, accelerated components together with astronomy and earth technological know-how and extra good points on key issues resembling the sunlight process and Genetically transformed Organisms. additionally featured are brief biographies of prime scientists and chronologies of particular matters, together with plastics, electronics and telephone 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)
Example text
P. d. 9) transforms to the α-form on heating and is a white microcrystalline solid. The compound occurs naturally as corundum or emery in the α-form with a hexagonalclose-packed structure of oxide ions with aluminium ions in the octahedral interstices. The gemstones ruby and sapphire are aluminium oxide coloured by minute traces of chromium and cobalt respectively. A number of other forms of aluminium oxide have been described (β-, δ-, and ζ-alumina) but these contain alkalimetal ions. There is also a short-lived spectroscopic suboxide AlO.
The conformation of the substrate-binding site becomes altered in the 27 inactive form and interaction with the substrate is not possible. Allosteric enzymes tend to catalyse the initial step in a pathway leading to the synthesis of molecules. The end product of this synthesis can act as a feedback inhibitor (see inhibition) and the enzyme is converted to the inactive form, thereby controlling the amount of product synthesized. allotropy The existence of elements in two or more different forms (allotropes).
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–. When the amine has a common nonsystematic name the sufÜx -ium can be used; for example, phenylamine (aniline) would give [C6H5NH3]+Cl–, known as anilinium chloride.
A Dictionary of Science (5th Edition) by John Daintith
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