we observed that a 4-fraction 100-rad dose resulted in a reduced yield of transformants compared to a single dose of 100 rad when plateau phase cultures were utilized for the radiation exposures , but not in low density cultures in which the cells were allowed to proliferate during the radiation exposures , these results suggest that the growth phase of the cells can play a major role in determining the yield of transformants induced by fractionated doses of radiation .
C0007634
cells
C0007595
growth