Abstract
Zusammenfassung Long-lasting Changes in Cell Permeability Induced by X-ray Radiation. — Using the plasmolytic method the authors confirmed their former findings that the cell permeability was considerably changed by ionizing X-ray radiation (1000 r), the irradiated cells of the inner epidermis of the third coat of the onion responding to electrolytic (0.5 M KNO 3 ) and non-electrolytic (1 M sucrose) plasmolyzing agents in different ways. It was further found that the mentioned changes in the cell permeability due to radiation varied for 40 experimental days. On the basis of the course of the changes in permeability, in these experiments, and from the results of as yet unpublished vegetation experiments, the authors maintain that the changes in the permeability caused by ionizing X-ray radiation are of a lasting character and sometimes even be irreversible.
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