The Biological Bulletin Volume 36 by Marine Biological Laboratory
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Author: Marine Biological Laboratory
Page Count: 128 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: Englishhttps://d20eq91zdmkqd.cloudfront.net/assets/images/book/large/9781/1302/9781130202533.jpg
ISBN: 9781130387537
File size: 38 Mb
Download Link: The Biological Bulletin Volume 36
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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. 1919 Excerpt: ... disintegration to the detached animals in cyanide. These experiments with alcohol and ether indicate first that inhibition of excitation and the resulting paralysis occur earliest in the tentacles and hypostome region. In concentrations where paralysis does not occur at once it can be seen that the paralysis progresses basipetally in the tentacles. In the column also the paralysis apparently progresses basipetally, although the fact that the body usually contracts before the stalk in the primary excitation may mask this relation in the higher concentrations. Apparently then the susceptibility as regards the paralyzing action of these anesthetic agents shows a basipetal gradient like the primary gradient. The second conclusion from these experiments is that disintegration and death are retarded in those regions which are paralyzed immediately or very early, as compared with those regions which show marked muscular activity before paralysis, so that disintegration may begin in the body below the tentacles (Fig. 65), and often also in the stalk, while the tentacles are mostly and the hypostome wholly intact. The course of disintegration in methylene blue and Janus green is essentially the same as in alcohol and ether. In these dyes, however, the excitation is more marked and in the lower concentrations (methylene blue, 1/10,000 or less, Janus green 1/50,000 or less) may continue for hours, but is finally followed by paralysis and rigidity in a state of more or less extreme contraction. This paralysis and rigidity, which perhaps resembles muscle rigor, appears first at the tips of the tentacles and progresses basipetally in tentacles, body and stalk. The motor behavior in these dyes consists at first merely of elongation, contraction and other movements of all...
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