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  • Title: Effects of very low doses of ionizing radiation on the clonal life-span in Paramecium tetraurelia.
    Author: Tixador R, Richoilley G, Monrozies E, Planel H, Tap G.
    Journal: Int J Radiat Biol Relat Stud Phys Chem Med; 1981 Jan; 39(1):47-54. PubMed ID: 6971819.
    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.
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