By Elizabeth Martin, Robert Hine

Absolutely revised and up-to-date, this new 6th variation is the suitable advisor for these learning biology both in highschool or university. The Dictionary bargains greater than 5,500 transparent and concise entries, together with greater than three hundred entries new to this version. It presents entire assurance of biology, biophysics, and biochemistry, contains biographical entries on key scientists, and lines highlighted entries on very important issues akin to bioinformatics, genomics, molecular evolution, and protein constitution. the hot version additionally good points internet hyperlinks accessed through a significant other site, that includes more information that's on a regular basis up-to-date to make sure that it remains clean. the amount additionally has many appendices, together with a listing of important sites, mass extinctions of species, and SI devices, plus completely new appendices on version organisms and their genomes and on Nobel prizewinners.

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Aluminosilicate The chief rock-forming mineral in, for example, some clays, feldspar, mica, and zeolite. Aluminosilicates are also key constituents of china, glass, and cement. Most have a tetrahedral silicate structure with aluminium atoms replacing some of the silicon. 24H2O, where A is a 31 monovalent metal and B a trivalent metal. 12H2O (aluminium potassium sulphate-12-water). 12H2O (see   ), etc. The alums are isomorphous and can be made by dissolving equivalent amounts of the two salts in water and recrystallizing.

Allopatric Describing or relating to groups of similar organisms that could interbreed but do not because they are geographically separated. Compare . See . allopolyploid A *polyploid organism, usually a plant, that contains multiple sets of chromosomes derived from different species. Hybrids are usually sterile, because they do not have sets of *homologous chromosomes and therefore *pairing cannot take place. However, if doubling of the chromosome number occurs in a hybrid derived from two diploid (2n) species, the resulting tetraploid (4n) is a fertile plant.

The current is passed through a resistor, which heats up as the current passes. This is in contact with a thermocouple, which is connected to a galvanometer. c. In the hot-wire instrument the wire is clamped at its ends and its elongation as it is heated causes a pointer to move over a scale. ammine A coordination *complex in which the ligands are ammonia molecules. An example of an ammine is the tetraamminecopper(II) ion [Cu(NH3)4]2+. d. p. p. 35°C. It is very soluble in water and soluble in alcohol.

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