Technical Mycology; The Utilization of Micro-Organisms in the Arts and Manufactures Volume 1

Technical Mycology; The Utilization of Micro-Organisms in the Arts and Manufactures Volume 1

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...atom C, with which are combined the four (different) atoms or radicals a, b, c, d. By employing the tetrahedron scheme, the arrangement of these latter can be effected in two different ways: --a C These two formulas are not identical, but stand in the mutual relation of an image and its reflection. In order to get from b over c to d, it is necessary (looking from a) in the one instance to move in the same direction as the hands of a clock; but in the other case the movement is reversed. The compound Cabcd is thus obtained in two modifications, which have the same structural formula, and behave similarly from a chemical point of view, but differ in a physical sense (crystalline habit, solubility, behaviour towards polarised light). Such compounds, whose different behaviour can only be explained by the assumption of a difference of grouping in the molecule, are designated stereo-isomers. Of the compound Cabcd there may exist one modification capable of deviating polarised light towards the right hand, and a second producing a left-handed rotation; and one part by weight of the dextro-rotatory modification gives rise to just as great a deviation towards the right hand as one part by weight of the levo-moditication does towards the left hand. If now a compound containing such an asymmetric carbon atom be artificially prepared from substances devoid of asymmetric atoms, the probability is that just as many levo-rotatory as dextrorotatory molcules will be produced; and assuming that each molecule of the one kind coalesces with a molecule of the other class to form a double molecule, then an optically inactive compound will result. There may therefore be presumably obtained from one combination, Cabcd, containing a single asymmetric carbon atom, three..show more

Product details

  • Paperback | 196 pages
  • 189 x 246 x 11mm | 358g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236509587
  • 9781236509581