Abstract
IN a recent review of the literature of photoreactivation, Jagger1 indicates that photoreactivation of the lethal and mutational effects of ultra-violet radiation occurs only up to the time of the first post-irradiation division. Brandt2 reports a photoreversal of the division-delaying effect of ultra-violet radiation in two protozoa, Didinium nasutum and Paramecium caudatum. This photoreversal occurs after the first post-irradiation division, but not after the second.
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References
Jagger, J., Bact. Revs., 22, 99 (1958).
Brandt, C. L., Ph.D. thesis, Stanford University (1955).
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CALKINS, J. Photoreactivation after Division. Nature 196, 686–687 (1962). https://doi.org/10.1038/196686a0
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DOI: https://doi.org/10.1038/196686a0