By John Daintith
This best-selling dictionary includes over 9,000 entries on all elements of technological know-how and gives entire 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 gains contain digital thumb tags for simple reference, multiplied components together with astronomy and earth technology and extra positive aspects on key issues comparable to the sun approach and Genetically transformed Organisms. additionally featured are brief biographies of prime 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 students and non-scientists alike.
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Additional info for A Dictionary of Science, 5th Edition (Oxford Paperback Reference)
The Ûuid endoplasm slides towards the front of the cell, forming a *pseudopodium and propelling the cell forward. On reaching the tip of the pseudopodium, the endoplasm is converted into ectoplasm; at the same time the ectoplasm at the rear of the cell is converted into endoplasm and streams forward, thus maintaining continuous movement. e. one that has no longrange order in its lattice. Many powders that are described as ‘amorphous’ in fact are composed of microscopic crystals, as can be demonstrated by X-ray diffraction.
In the more recent *transistor, the emitter–collector current is controlled in much the same way by the signal applied to the transistor’s base region. In the most modern devices the complete ampliÜer circuit is manufactured as a single *integrated circuit. d. 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.
The angle between a wavefront and a surface that it strikes. angle of reÛection 1. The angle between a ray leaving a reÛecting surface and the perpendicular (normal) to the surface at the point at which the ray leaves the surface. 2. The angle between a wavefront and a surface that it leaves. angle of refraction 1. The angle between a ray that is refracted at a surface between two different media and the perpendicular (normal) to the surface at the point of refraction. 2. The angle between a wavefront and a surface at which it has been refracted.