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Science 23 January 1959:
Vol. 129. no. 3343, pp. 207 - 208
DOI: 10.1126/science.129.3343.207
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Articles

Mutation in the Protozoan Paramecium multimicronucleatum as a Result of X-irradiation

RALPH WICHTERMAN 1

1 Department of Biology, Temple University, and Marine Biological Laboratory, Woods Hole, Massachusetts

Mutations have been produced in the protozoan Paramecium multimicronucleatum by repeatedly exposing clonal cultures of the animals to large dosages of x-irradiation. The descendants of x-rayed survivors showed the following changes, which persisted in culture: destruction and loss of all micronuclei, decrease in vitality and reproductive rate, increase in x-radiation sensitivity, monstrosity, and reduced body size.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)