Studies from the Rockefeller Institute for Medical Research Volume 31

Studies from the Rockefeller Institute for Medical Research Volume 31

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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. 1919 edition. Excerpt: ...It is definitely established that a number of life phenomena have a temperature coefficient characteristic of chemical reactions, namely of about 2 for a difference of temperature of about 10C.; although at the lower and upper temperature limit this coefficient changes more rapidly than it is usually found to change in purely chemical processes. This might be interpreted to mean that the order of magnitude of the rate of such life phenomena and of chemical reactions is the same and that such life phenomena are due to definite chemical reactions, e.g., a reaction resultingin the formation of a hormone. Such a temperature coefficient was first observed by F. Lillie and Knowlton for the development of the egg of the frog and has since been found to exist generally. If we could show that in a species with a definite metamorphosis there exists not only a definite temperature coefficient for the duration of life of the order of that of a chemical reaction, but that this coefficient is approximately identical with the temperature coefficient of the duration of the larval stage or stages, we should not have certainty but at least some probability that the duration of life is determined by causes similar to those which determine the duration of the larval stages. Our experiments were made on the fruit fly which has three definite stages, larval, pupa, and imago. We have already reported on some experiments in this direction2 but our new experiments were made on forms which had been freed from all microorganisms. This was necessary on account of Metchnikoff's suggestion that poisons formed by intestinal microorganisms play an important r61e in limiting the duration of life. Moreover, in our previous experiments only water or sugar solutions more

Product details

  • Paperback | 166 pages
  • 189 x 246 x 9mm | 308g
  • United States
  • English
  • black & white illustrations
  • 1236863836
  • 9781236863836