Abstract
1. The changes in the activity and absorption spectrum of the catalase solution, which was prepared from Porphyra pseudolinearis, caused by the exposure to ultra-violet rays were studied.
2. The activity was rapidly reduced when the solution was exposed to ultraviolet rays. It was reduced by half when exposed for ninety minutes, and by 80% when exposed for one hundred and eighty minutes.
3. In proportion to the reduction of the catalase activity caused by the exposure to ultraviolet rays, the absorption coefficients of the catalase solution at the wave lengths 555mμ, 533mμ and 495mμ, which are attributable to phycoerythrin, diminished by degrees. The absorption, bands vanished completely when exposed to the rays for one hundred and eighty minutes.
4. In the spectrum of the catalase solution prepared from Porphyra pseudolinearis, collected in June, the absorption band attributable to phycocyan could not be observed.
