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Isolated silkgland ribosomes were irradiated with x rays from 570 to 4600 R, and their ability to synthesize fibroin in vitro was examined. A marked decrease in their activities was observed when ribosomes were incubated at 37 deg C following x irradiation. Per cent decrease in the ribosomal activity leveled off at 37 deg C after 30 min incubation. The extent of decrease was dependent on x-ray dose. Treatment of ribosomes with pancreatic ribonuclease showed a decrease in the ribosomal activity. These results suggest that a type of radiation damages on irradiated ribosomes is likely to be revealed during the post-irradiation incubation period through a possible interaction with ribonuclease either activated or released by x irradiations. (auth)

Effects of Post-irradiation Incubation on the Fibroin Synthetic Activity of Silkgland Ribosomes