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A Comparative and Experimental Study of Bacilli Producing Red Pigment

A Comparative and Experimental Study of Bacilli Producing Red Pigment


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...is a constant character in their biology. Again, a bacterial type, as we assume it, is more or less artificial, developed and maintained by our methods of culture, which are so arranged as to reduce or eliminate variation. And the old simple distinctions between typical varieties are now complicated not only by the natural variability of the organisms, but by the conception of intermediary paratypes, each with its own possibilities of variation. The variability of bacteria, whether manifested spontaneously or under compulsion, seems to find its expression principally in the loss of certain characters or in their return after loss. If, for instance, B. anthracis be exposed to a temperature of 42, B. tetani to a gradual admission of oxygen, orB. prodigiosus to the action of light, the organisms will all live and develop, but one will lose its power of sporulation, another its virulence, the other, its power of pigment production; and unless the abnormal conditions be maintained for many generations, and the process fostered by artificial selection, the organisms will, upon restoration to their usual environment, revert to their original "normal" type. These and many similar observations indicate that bacteria have a certain number of biological characters, without which they may continue to live; that these characters may be lost as a result of environmental modification, but are so far typical that they tend strongly to return. This "tendency to return" finds its nearest explanation quantitatively, that is, in considering as a factor in variation not only the effect of the environment upon the organism, but also the nature of the compound of characters which we term a type. The aberrant or white forms among the red, for...


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Product Details
  • ISBN-13: 9781234376345
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234376342
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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