The Biological Bulletin Volume 33-34 by Marine Biological Laboratory
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Author: Marine Biological Laboratory
Page Count: 256 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130038156
File size: 10 Mb
File Name: The.Biological.Bulletin.Volume.33-34.pdf
Download Link: The Biological Bulletin Volume 33-34
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...excretion products in the J series. But whatever the cause, the experiment affords an opportunity to study the effect of naturally changed conditions, involving a lowered fission rate, on the periodicity of rhythms and endomixis. Now since the s subcultures divided at a much lower rate than the parent cultures, and since endomixis appeared fairly synchronously in parent and 5 sets, it is obvious that endomixis consistently appeared in the J subcultures within a smaller number of generations. In other words, the treatment of the 5 F1g. 10. series apparently resulted merely in reducing the number of cell divisions in a given time and had practically no effect (except in the first period) on the occurrence of endomixis. On the basis of this set of cultures, then, endomixis is to a certain extent independent of the number of generations and more closely related to a time factor, if such an expression may be employed. The B pair of cultures affords a fairly typical example (Fig. 11). In B endomixis occurred at periods 59, 63 and 70; while in Bs it occurred at periods 59, 64 and 70. Thus the length of time in days between successive reorganizations is 20 and 35 in B, and 25 and 30 in Bs. Therefore in both cultures the same number of days (55) elapsed from one endomixis to its second following occurrence. On the other hand in B the process was in progress at the 335th, 370th and 435th generations, that is at intervals of 35 and 65 generations, while in Bs it took place at the 335th (when Bs was isolated from B), 360th and 380th genera tions, or at intervals of 25 and 20 generations. Therefore in B 100 generations were attained from one endomictic period to the second following occurrence of the process; while in Bs only 45 generations occurred during the same peri...
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