KEMPNER AND POLLARD 



o.) Unirradiated b.) 253,000 r 



127 



760,000 r 



15 5 10 15 



INCUBATION TIME 



10 



I5min 



Fig. 2. The effect of y radiation on methionine incorporation in E. coli. Except where 

 otherwise marked in these figures, solid circles correspond to the label in the intact cell, 

 and crosses refer to the cold-TCA-insoluble fraction. The difference between these two 

 curves, the "pool," is seen to decrease with increasing dose of radiation. Background was 

 20 cpm and has been subtracted. 



o) Unirradiated 



b.) 3 1 7, 000 r 



c.) 950,000 r 



10 



15 5 10 



INCUBATION TIME 



15 



10 



15 min 



Fig. 3. The effect of y radiation on proline incorporation. The cold-TCA-soluble "pool" 

 rises in magnitude and then falls off with dose. 



