By John Daintith
This best-selling dictionary comprises over 9,000 entries on all features of technology and gives accomplished 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 beneficial properties comprise digital thumb tags for simple reference, elevated parts together with astronomy and earth technological know-how and extra beneficial properties on key issues reminiscent of the sun process and Genetically transformed Organisms. additionally featured are brief biographies of best scientists and chronologies of particular topics, together with plastics, electronics and mobile 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
Or current) of an ampliÜer (or stage of an ampliÜer) to the corresponding input amplitude is called the gain of the ampliÜer. amplitude See wave. amplitude modulation (AM) See modulation; radio. ampulla 1. An enlargement at one end of each of the *semicircular canals of the inner ear. Each ampulla contains a group of receptors – sensory hair cells – embedded in a gelatinous cap (cupula), which detects movement in one particular dimension, corresponding to the plane of the canal. Movement of the head causes the cupula (and the hairs within it) to bend in a direction opposite to that of the head movement; this stimulates nerve impulses in the receptors, which are interpreted by the brain as movement in a particular dimension.
Ambient noise is the background noise in relation to a particular sound, such as music. g. of the atmosphere, in relation to a speciÜc object or system. americium Symbol Am. n. 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.
It readily releases ammonia and is the basis of sal volatile. It is also used in dyeing and wool preparation and in baking powders. d. 53; sublimes at 340°C. It is very soluble in water and slightly soluble in ethanol but insoluble in ether. It may be prepared by fractional crystallization from a solution containing ammonium sulphate and sodium chloride or ammonium carbonate and calcium chloride. Pure samples may be made directly by the gas-phase reaction of ammonia and hydrogen chloride. Because of its ease of preparation it can be manufactured industrially alongside any plant that uses or produces ammonia.
A Dictionary of Science, Fifth Edition by John Daintith