PMID: 6971819Jan 1, 1981Paper

Effects of very low doses of ionizing radiation on the clonal life-span in Paramecium tetraurelia

International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine
R TixadorG Tap

Abstract

Effects of very low doses of ionizing radiation were investigated on life-span in Paramecium tetraurelia. After autogamy single cell cultures were place (1) in a control chamber with radiopermeable walls; (2) in a shielded device with 10 cm thick lead walls; (3) in a similar shielding device including a 60Co source giving a dose of 760 mrad per year at the culture level. Life-spans, expressed in days and in mean total number of fissions measured from autogamy to the death of all sublines, were about 200 fissions and 55 days in controls. Life-spans of shielded sublines were increased and lower life-spans were observed in both shielded and irradiated sublines. These findings provide new evidence for a biological effect of very low doses of ionizing radiations and show that fission potential of Paramecium tetraurelia can be affected by variations in the background radiation level.

References

Mar 1, 1976·Mechanisms of Ageing and Development·V Sundararaman, D J Cummings
Jan 1, 1976·Journal of Gerontology·J Smith-Sonneborn, J C Reed
Feb 1, 1972·Experimental Cell Research·L Lima, A Macieira-Coelho
Mar 1, 1965·Experimental Cell Research·L HAYFLICK

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Citations

Apr 1, 1983·International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine·A ConterH Planel
Jan 1, 1992·Mutation Research·S FukushimaS Sasagawa

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