Abstract
1. 1. T. pyriformis GL was grown in a chemically defined medium. 2. 2. Synchronous division was induced by the temperature flux method. 3. 3. The succinic dehydrogenase activity was tested in both control and irradiated cultures of each stage of division. 4. 4. The enzymatic activity of those control organisms tested immediately after shock treatment and those tested 150 minutes after shock treatment (stages II and VII) was inhibited when compared to the normal control (stage I). 5. 5. In the same two stages (II and VII), radiation caused a significant acceleration of activity. 6. 6. We feel that this acceleration of enzymatic activity may be the result of an attempt on the part of the organisms to recover from the lethal effects of radiation.
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