Microbiology for Agricultural and Domestic Science Students

Microbiology for Agricultural and Domestic Science Students

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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. 1911 edition. Excerpt: ...do not develop rapidly. Pennington found that certain species of streptococci developed quite rapidly in cream held at refrigerator temperatures. Streptococci were found in fifty-five (80 per cent) of the sixty-eight samples examined. It was found that at refrigerator temperatures the relative growth of these organisms was greater than at higher temperatures, a fact which may account, in part at least, for the frequency with which this organism occurs in ice cream. Frequently ice cream is held for a considerable time in a frozen condition before it is sold. It has generally been supposed that there is no Results of work done under the direction of Dr. G. W. Stiles, t Work done under the direction of Dr. M. E. Pennington. bacterial growth in material which is held below the freezing temperature. This, however, did not seem to be the case in samples examined by the investigators already mentioned. They found in samples held about a month that there was normally a decrease in the bacterial count and also in the amount of gas production for a number of days, after which there was frequently a marked increase in the bacterial counts. These results would seem to indicate that even in the frozen condition there may be some increase in the number of bacteria present. The number of these experiments, however, is not sufficient to justify very general conclusions. The work of Conn and Esten in holding milk at i may throw some light upon this question. If the cream from which the ice cream is made has been produced and handled under sanitary conditions, the bacterial content should consist chiefly of organisms of the Bad. lactis acidi type, in which case the high count in the ice cream might not be objectionable. If, on the other hand, the cream has...show more

Product details

  • Paperback | 272 pages
  • 189 x 246 x 14mm | 490g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236797183
  • 9781236797186