Hog Cholera and Preventive Serum

Hog Cholera and Preventive Serum

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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. 1913 edition. Excerpt: ... of potato heated at 110 C. in autoclave for fifteen minutes. These two series of five plates each were inoculated at the same time and from the same culture. Both series of cultures grew well. Series I at a temperature of 12 to 15 C. This we did not vary for five days from 15 C. Growth was as vigorous as in those at the higher temperature. No fermentation zone was observed during the fourteen days of the experiment. In the incubator at 23 to 26 C. growth began to show after twentyfour hours. In forty-eight hours on December 16, 1908, the growth had increased and was very vigorous and the fermentation zone was just beginning to appear in all of the five cultures as a very faint, whitish line outside the margin of growth. This zone constantly became more evident, and on the fourth day from inoculation was at its best. Further growth was slower and no great change was to be observed during the two weeks of observation. Professor Pierce in his study laid stress upon this characteristic to separate the walnut organism from the closely related species, Pseudomonas campestris. To test this, we secured a culture of the latter organism from Dr. H. A. Harding of the Geneva Experiment Station of New York State. On July 1,1911, potato slices were inoculated in the same way as has already been described. Black rot of cabbage (Pseudomonas campestris) and walnut organisms were used. July 5th, the two series of cultures were examined. Both cultures from the incubator at 26 to 28 C. showed fine fermentation zone formation. In fact, it would be difficult to distinguish one from the other. The culture of the walnut organism grown in the culture room at a temperature of 20 C. showed very good fermentation zone formation, while that of Pseudomonas campestris...show more

Product details

  • Paperback | 292 pages
  • 189 x 246 x 15mm | 526g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236778782
  • 9781236778789