Abstract
The existence of photoreactivation in the green unicellular algaChlamydomonas reinhardi Dangeard was demonstrated. The dose reduction factor was constant throughout practically the whole of the dose range and was approximately 0.5. Photoreactivation was not found in cells irradiated with X-rays. The maximum photoreactivation after ultraviolet irradiation was reached after about 30 minutes’ illumination with 2,300Lx. No difference was found between the rate of photoreactivation carried out immediately and 30 minutes after ultraviolet irradiation. The rate of photoreactivation, under the given conditions, seems to be limited chiefly by the supply of light energy. The photoreactivation enzyme is probably a stable component of the cell.
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