By John Daintith
This best-selling dictionary includes over 9,000 entries on all features of technological know-how and gives accomplished assurance 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 gains contain digital thumb tags for simple reference, extended parts together with astronomy and earth technology and extra positive factors on key themes similar to the sunlight process and Genetically transformed Organisms. additionally featured are brief biographies of top scientists and chronologies of particular matters, together with plastics, electronics and phone 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 (5th Edition)
For example, membrane-bound aminopeptidases in the small intestine break down peptides and dipeptides into amino acids. amino sugar Any sugar containing an amino group in place of a hydroxyl group. The hexosamines are amino derivatives of hexose sugars and include glucosamine (based on glucose) and galactosamine (based on galactose). The former is a constituent of *chitin and the latter occurs in cartilage. α-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 anhydrous salt is soluble in water and slightly soluble in ethanol; the hydrate is very soluble in water and insoluble in ethanol. 18H2O). It may be prepared by dissolving aluminium hydroxide or china 31 clays (aluminosilicates) in sulphuric acid. It decomposes on heating to sulphur dioxide, sulphur trioxide, and aluminium oxide. Its solutions are acidic because of hydrolysis. Aluminium sulphate is commercially one of the most important aluminium compounds; it is used in sewage treatment (as a Ûocculating agent) and in the puriÜcation of drinking water, the paper industry, and in the preparation of mordants.
The ammonia molecule (NH3) consists of a pyramid with a nitrogen atom at the apex and one hydrogen atom at each corner of the triangular base. 9 microseconds later it returns to its original position. This vibration back and forth has a frequency of 23 870 hertz and ammonia gas will only absorb excitation energy at exactly this frequency. By using a *crystal oscillator to feed energy to the gas and a suitable feedback mechanism, the oscillator can be locked to exactly this frequency. ammonia–soda process See solvay process.
A Dictionary of Science (5th Edition) by John Daintith