Download A Dictionary of Science, 5th Edition (Oxford Paperback by John Daintith PDF

By John Daintith

This best-selling dictionary includes over 9,000 entries on all points of technology 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 category. New positive aspects comprise digital thumb tags for simple reference, extended parts together with astronomy and earth technological know-how and extra positive aspects on key subject matters resembling the sun process and Genetically changed 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 students and non-scientists alike.

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Extra resources for A Dictionary of Science, 5th Edition (Oxford Paperback Reference)

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The highly protective Ülm of oxide formed on the surface of aluminium metal is yet another structural variation, being a defective rock-salt form (every third Al missing). Pure aluminium oxide is obtained by dissolving the ore bauxite in sodium hydroxide solution; impurities such as iron 30 oxides remain insoluble because they are not amphoteric. The hydrated oxide is precipitated by seeding with material from a previous batch and this is then roasted at 1150–1200°C to give pure α-alumina, or at 500–800°C to give γ-alumina.

Heating the hydrated hydroxide causes loss of water, and produces various activated aluminas, which differ in porosity, number of remaining –OH groups, and particle size. These are used as catalysts (particularly for organic dehydration reactions), as catalyst supports, and in chromatography. Gelatinous freshly precipitated aluminium hydroxide was formerly widely used as a mordant for dyeing and calico printing because of its ability to form insoluble coloured *lakes with vegetable dyes. See also aluminium oxide.

The tiny air sac in the *lung of mammals and reptiles at the end of each *bronchiole. It is lined by a delicate moist membrane, has many blood capillaries, and is the site of exchange of respiratory gases (carbon dioxide and oxygen). 2. The socket in the jawbone in which a tooth is rooted by means of the *periodontal membrane. Alzheimer’s disease A neurological disease characterized by progressive loss of intellectual ability. The disease, which is named after German physician Alois Alzheimer (1864–1915), is associated with general shrinkage of the brain tissue – with deposits of β-amyloid peptide (a glycoprotein) and abnormal Ülaments of tau protein associated with *microtubules – and changes in the neurotransmitter systems within the brain that include a loss in the activity of *cholinergic neurons.

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