Studies; Reprints Volume 29

Studies; Reprints Volume 29

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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: ...AND J. H. NORTHROP. (From the Laboratories of The Rockefeller Institute for Medical Research.) (Received for publication, September 4, 1917.) I. Introductory Remarks. In order to find out the nature of the causes which detennine the natural duration of life of metazoa a quantitative method is required, which pennits us to represent the duration of life as the numerical function of one variable. Starting from the idea that chemical conditions in the organism are one of the main variables in this case, one of us raised the question whether there was adefinite-temperature coefiicient for the duration of life and whether this temperature coefiicienlt was of the order of magnitude of that of a chemical reaction.1 The first experiments were made on the unfertilized and fertilized eggs of the sea urchin and could only be carried out at the upper temperature limits of the organism, since at ordinary temperatures this organism lives for years. In the upper temperature region the temperature coeflicient for the duration of life was very high, probably on account of the fact that at this upper zone of temperature death is determined by a change of the nature of acoagulation or some other destructive process. Moore,2 at the suggestion of Loeb, investigated the temperature coefficient for the duration of life for the hydranth of a tubularian at the upper temperature limit and found that it was of the same order of magnitude as that previously found for the sea urchin egg. In order to prove that there is a temperature coeificient for the duration of life throughout the whole scale of temperatures at which an organism can live experiments were required on a form whose duration of life was short enough to measure the duration of life even at the more

Product details

  • Paperback | 196 pages
  • 189 x 246 x 11mm | 358g
  • United States
  • English
  • black & white illustrations
  • 1236936914
  • 9781236936912