A Text Book of General Bacteriology

A Text Book of General Bacteriology

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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. 1910 edition. Excerpt: ...The exact way in which assimilation is accomplished is unknown. The requirements of bacteria, so far as their food is concerned, is first that it be soluble, although it is true, as will be pointed out later more specifically, that the bacteria are able to produce substances which dissolve insoluble material and make it possible for them to take up substances that are not soluble. The second requirement is that they have the right kind of food, and the bacteria as a whole can make use of a great many different kinds of food, and may be classified on this basis. Bacteria, with the exception of one group, are unable to make use of the carbon dioxide of the air as a source of carbon. Some bacteria are able to live on dead organic matter; another group require that their food be living organic matter. A classification of bacteria according to their nutritive requirement has been proposed by Fischer, and is as follows: --I. Prototrophic Bacteria. Nitrifying bacteria, bacteria of root nodules, sulphur and iron bacteria; occur only in the open in nature, never parasitic, always monotrophic. II. Metatrophic Bacteria. Zymogenic, saprogenic, and saprophytic bacteria; occur in the open and upon the external and internal surfaces of the body, sometimes parasitic (facultative parasites), monotrophic, or polytrophic. III. Paratrophic Bacteria. Occur only in the tissues and vessels of living organisms, true (obligatory) parasites. Catabolism.--By catabolism is meant all the chemical processes going on in the cell which lead to the formation of simple substances from complex ones (Vines). The cell protoplasm is constantly being broken down and by-products formed. Anabolism and catabolism are constantly going on in the same cell. If organic matter of the cell is..show more

Product details

  • Paperback | 76 pages
  • 189 x 246 x 4mm | 154g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236664523
  • 9781236664525