INCORPORATIOX OF "C IXTO TISSUE 



810 



The results of the investigation of the effect of irradiation on the ^^C 

 uptake by tissue fractions of fuUygrown mice is seen in Table 8. This table 

 does not contain the results obtained in our first experiment carried 

 out with 38 mice in which the ^^C content of dry tissue samples alone 



Brain 



Intesr. 

 Mucosa 



Liver 



i 



I 



y. 



Muscles 



i 



Heart 



^ 



21 



Spleen 



1 



m 



Plasma 



n 



i 



i 



I 



Fig. 13. Uptake of i*C by I mgm dry tissue of irradiated and of 

 control suckling rats 3 hr after intraperitoneal injection of 



NaCHg "COO. 



was compared^i\ In this experiment, the irradiated samplesof all tissues 

 took up appreciably more (13 to 106 per cent) ^^C than the controls. 

 As seen from Table 8 irradiation increases the mean value found for 

 the rate of i*C incorporation in all the investigated tissue fractions of 

 fed mice except that into muscle proteins. The increase is, however, 

 for most fractions not significant as the mean deviations are very appre- 

 ciable. A suggestive increase is observed in the three brain fractions 

 (P = < 0.03; < 0.005 and < 0.05) and also in the protein fraction of 



(^) G. Hevesy, 164, 269 (1949), 



.^2* 



