Ultraviolet Inactivation of Chloroplast Formation in Synchronously Dividing Euglena gracilis

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Science  24 Jul 1964:
Vol. 145, Issue 3630, pp. 392-393
DOI: 10.1126/science.145.3630.392


Ultraviolet inactivation of chloroplast formation was studied in synchronously dividing cultures of Euglena gracilis. Sensitivity to sublethal doses given at intervals throughout the cell cycle was greater just before cell division than during division. There was approximately a twofold difference in the doseresponse relationships for the periods of high and low sensitivity.