Botanical Gazette Volume 59

Botanical Gazette Volume 59

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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. 1915 edition. Excerpt: of sea water a mixture of 1ooo cc. NaCI o. 52M + 20 cc. CaCU o. 278M, in which case no precipitate is formed. It should be noted that the addition of lanthanum chloride has the same effect as the addition of lanthanum nitrate. In order to ascertain whether this change in permeability is reversible, the tissue was replaced in sea water. In the course of an hour its resistance returned again to the original condition.8 The experiment was then repeated three times on the same lot of material with practically the same result; it was then allowed to stand over night in sea water. On the following day there was no 1100. OHMS DAY 9 10 11 12 18 14 16 10MIN F1g. 2.--Alterations of permeability shown by curves of the electrical resistance of Laminaria saccharina in NaCl 0.52M (unbroken line) and in sea water (dotted portion of curve); upper dotted line, control in sea water. appearance of injury, and its resistance was the same as that of the control, which had remained in sea water throughout the experiment. The tissue was then placed in the sea water plus lanthanum and left until its resistance had increased 100 ohms; it was then put back into sea water and left until the resistance fell to nearly normal. This was repeated three times, and the tissue 8 If the material is left in sea water plus lanthanum nitrate the increased resistance is maintained for a long time unaltered. was then allowed to stand over night in sea water. On the third, fourth, and fifth days the same experiment was repeated four times. On the fifth day the tissue appeared to be in as good condition as the control, and had a resistance which was slightly higher. There was no reason, therefore, to suspect that the changes in permeability had been attended by any more

Product details

  • Paperback
  • 189 x 246 x 10mm | 327g
  • United States
  • English
  • black & white illustrations
  • 1236821777
  • 9781236821775