Abstract
The change in the catalase activity of Porphyra tenera and coral algae were studied by the iodometric titration method. (1) The catalase activity changes during the course of the day; i.e., the activity of the catalase solution which was prepared from 12 to 16 o'clock shows the lowest value. (2) The activity was reduced when the fronds were exposed to sunlight. It was reduced by about 75% when they were exposed for two hours, and by 60% for four hours in Porphyra tenera. But, in the coral algae, it was reduced by 30% when the exposed for 30 minutes. In each case, the activity was not markedly reduced by the longer exposure. (3) The activity was reduced when phenol and urea were added to the solution which was prepared from Porphyra tenera.
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