Contributions from the Biological Laboratories in Princeton University Volume 6

Contributions from the Biological Laboratories in Princeton University Volume 6

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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. 1918 edition. Excerpt: ...of the dried tissues, must certainly be higher than that of seeds. The Mechanism of Metabolism in the Dried Rotifer. Admitting that the desiccation of Philodina is complete and admitting further that metabolism takes place though much retarded, in the dried condition, the mechanics of the metabolic activity is the next point to demand explanation. Flt will be remembered that Jacobs ('09) showed by means of intra vitam staining with chemical indicators and subsequent tests with various gases, that the integument of the dried rotifer is at all times freely permeable to gases. Attention was called, in another paragraph of this paper, to the fact that many animals when deprived of their normal supply of moisture could still exist for a time by means of the direct action of oxygen from the air upon the complex materials of the tissues or upon inclusions of complex food materials within the latter. This action would of course not be sufiicient to prolong life indefinitely for the time would come when all the available reserve food material would be exhausted or the accumulation of poisonous waste products might end life. That such a state of affairs might be realized in the case of a dried Philodina in the air is not impossible. Certain it is that this animal can live a long time; many years in fact, in a dried condition without food from external sources. Its lease of life, however, under these conditions, is not indefinite as is evidenced by the fact that under the most careful conditions of drying some of the rotifers always die. To explain these fatal cases it would seem that the store of reserve material became exhausted or the metabolic products accumulated in too great a quantity and death was the result. It seems reasonable to assume...show more

Product details

  • Paperback | 230 pages
  • 189 x 246 x 12mm | 417g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236785878
  • 9781236785879