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Ultraviolet (UV) inactivation of green colony-forming ability of several different types of Euglena gracilis var. bacillaris was studied. The observed target numbers are not widely different, while the doses required to produce a single inactivation event (D o ) vary with the type of cell used. In dark-grown cells adapting to the light in resting medium and in an X-ray-induced mutant, D ...
Photoreactivation (PR) of green colony-forming ability in Euglena is pH-insensitive from pH 6.0 to 8.0 and temperature-sensitive with a maximum rate at 35°C. There is no PR at 0°C. The rate of PR varies with the growth stage of the cells; PR of exponential phase cells is slower than that of stationary phase cells. The reciprocity rule holds for PR over a 6-fold range of intensity. The shape of PR...