INCORPORATION OF "C INTO TISSUE 



815 



diation. In this experiment no significant increase in the ^^0 incorporation 

 into liver proteins of the irradiated rats was observed. 



When comparing the figures obtained for suckling rats with those of 

 fully grown mice great differences are observed. 



Intest. 

 Mucosa 



V^ 



Liver 



Z 



% 



Control Irrod. 



D 



Plasmo 



i 



^ 



Lungs 



^m 



Muscles 



Brain 



Fig. 6. Uptake of ^*C by 1 mgm of tissue protein of irradiated 

 and of control mice 90 min after intraperitoneal injection of 



NaCHa "cOO. 



Intest. 

 Mucosa 



Liver 



Muscles 



Kidneys 



r 



Brain 



Fig. 7. Uptake of "C by 1 mgm of tissue proteins of irradiated and of 

 control mice 24 hr after irradiation and 105 min after subcutaneous 



injection of NaCHg i^COO. 



As similar differences were observed when comparing the i'*C uptake 

 by young and by adult mice in experiments carried out by Fokssberg 

 and one of us, the results of which will be soon published, these first 

 mentioned differences are not mainly due to differences in the metabolic 

 rate of rats and mice, but to a large extent to the fact that in one case 



