Elementary Bacteriology by M L Dhingra at Bookstore UAE
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Elementary Bacteriology

Elementary 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: THE GENERAL BIOLOGY OF BACTERIA. According to the generally accepted hypothesis of the origin of the earth, it is obvious that the first formed bacteria must have existed under conditions totally different from those which prevail to-day. The atmosphere must then have been poorer in oxygen and light, but of a higher temperature; and there must also have been a notable lack of organic food-stuffs. It is, therefore, interesting to find certain species which still retain their primitive ancestral characters, and can only grow without light, oxygen or organic matter; and others again which thrive only at the boiling temperature. It is important, then, to bear in mind that although bacteria in general can grow when supplied with suitable food and temperature, yet their precise requirements admit of the greatest variations. A.?Conditions Of Growth. 1. Nutrient Media.?Like all higher plants, bacteria require for their food materials whence they obtain the elements of which they are made up. Carbon is derived from carbohydrates, and nitrogen from albuminoids, or more rarely from inorganic compounds. In addition to these sources of nitrogen and carbon, all media must contain salts and an abundance of water. A neutral or faintlyalkaline reaction is generally indispensable. The media usually employed in the laboratory are bouillon, gelatine, agar, blood serum, etc. Bacteria, however, are exceedingly fastidious in their demands. Thus, while some are easily satisfied with ammonium salts, others refuse to grow unless cultivated in blood serum, and still others refuse to grow at all in any of our artificial media. Again, the range of their requirements is so narrow that trivial differences in the composition of food materials may favour the growth of one organism in preference to the...


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Product Details
  • ISBN-13: 9781459069466
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1459069463
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 113 gr


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