Electronic Resource
Springer
Protoplasma
42 (1953), S. 63-68
ISSN:
1615-6102
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Conclusions In comparing the uptake of Na* byValonia and that byHalicystis, it was found that the greater proportion was taken up by the protoplasm in the former case, and by the sap in the latter case. In former experiments only the sap was tested for penetration and found to contain negligible concentrations of Na inValonia and comparatively larger concentrations inHalicystis. It is therefore of interest to show that Na* does penetrateValonia but is taken up by the protoplasm considerable concentrations; but that it does not pass into the sap under normal conditions, thereby showing that the semi-permeable membrane between the sap and the protoplasm is the region of non-penetration. InHalicystis this is not the case since Na* was found in both the sap and the protoplasm of this cell. Further work on the difference between these two membranes would be of interest in elucidating the movement of K and Na ions through membranes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01248656
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