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A Manual of Determinative Bacteriology

A Manual of Determinative Bacteriology


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER II THE STUDY OF THE CULTURAL CHAEACTERS AND BIOCHEMICAL FUNCTIONS OF BACTERIA It is important that students shall study any new or old bacterial forms over a sufficiently long period to fully establish their characters. To publish a description of a bacterium after a study of one or two generations is the height of superficiality. An organism should be observed over a considerable period of time, at least until its characters become fixed and constant. Forms freshly isolated from a natural habitat, as soil or water, frequently show certain modifications of their characters after successive cultivation on artificial media; so much so, that a description of a species in its early generations may differ rather widely from those of far later periods. Eventually the organism, conforming to its new environment, will establish characters which are reasonably constant. These variations, should they occur, need to be embodied in a description, or such a sufficient range given to the descriptive characters as to include said cultural variations. It is a familiar fact that slight differences in the condition of the medium will modify the macroscopic characters of a growth. Thus, in milk cultures, it may take very little to disturb the balance between an unchanged appearance of the medium and the formation of a coagulum. Indol formation may also become an uncertain factor in the biochemistry of an organism. Gelatin colonies in their microscopic characters are open to wide variations, so much so that it is a question whether they have any great value in species differentiation. In fact, even the macroscopic appearance of a gelatin colony may be modified by rapidity of growth, a slowly growing organism forming a convex growth of small diameter, which becomes flatter and more s...


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Product Details
  • ISBN-13: 9780217431606
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 120
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 0217431607
  • Publisher Date: 12 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 227 gr


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