Abstract
Partial cell irradiation of intracellular yeast catalase with low-energy electrons was carried out. The enzyme activity could be increased when the bombarding electrons did not reach the region of the cell containing the enzyme. This region has its outer bound at least 2000 A. deep in the cell, which is 1500 A. deeper than the locus of invertase. The increase in activity caused by ionizing radiation is due to an effect on a structure near the cell surface, which is very probably within the cell wall.
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