Micro-Organisms with Special Reference to the Etiology of the Infective Diseases

Micro-Organisms with Special Reference to the Etiology of the Infective Diseases

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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. 1890 edition. Excerpt: ...are also very easily injured by the Destruction of second factor, namely, the overgrowth by saprophytes, bacilli by When mixed with other bacteria they can, if they are 8prophytes, present at first in considerable excess, and if the conditions as regards nutrition, temperature, reaction, and presence of oxygen, are especially favourable, gain the upper hand in the first instance, and thus form those pure cultivations which have been observed on the clothes of cholera patients, on moist soil impregnated with dejecta, and in the culture vessels prepared by Schottelius' method; but after two or three days a complete alteration in the character of the cultivation occurs in these cases; the comma bacilli die, and other bacteria gradually occupy the whole of the nutrient substrata. If the saprophytes are in excess in the first instance, or if the sum total of the conditions of life are not very favourable to the comma bacilli, the latter do not multiply at all, but the saprophytic bacteria lead rapidly to the death of the comma bacilli present, either by using up the nutrient material, or by producing poisonous products. According to Koch's experiments, comma bacilli when added to sewage could no longer be demonstrated after 24 hours; in the water in the Berlin Canal they died at the latest after 6 to 7 days. In impure water also they do not retain their vitality as a rule for a longer time, except when they are introduced in very large quantities. Length of life If the two hurtful influences above mentioned are bLmi re absent the vitality of the comma bacilli may be of cultivations. iong duration. They can be kept alive for months in fluid, or, at any rate, moist, pure cultivations; in gelatine cultivations they have been found living after 8...show more

Product details

  • Paperback | 284 pages
  • 189 x 246 x 15mm | 513g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236951816
  • 9781236951816