818 



ADVENTURES IN" RADIOISOTOPE RESEARCH 



of 1 mgm of liver proteins is smaller than that of the liver fats, in the 

 suckling rats the "C content of 1 mgm of liver proteins is larger than 

 that of 1 mgm of liver fats. 



The great difference in the distribution of i*C between the various 

 tissues of outgrown and rapidly growing animals is also brought out by 

 the Figs. 8— 13 in which the i^C content of 1 mgm of dry tissue is stated. 

 In these as well as in the previous figures the "C content of the intestinal 

 mucosa is taken to be 100. 



Infest. 

 Mucosa 



Liver 



V: /. 



Kidneys 



Muscles 



///I 



/A 



Brain 



M 



Fig. 12. Uptake of ^^C by 1 mgm of dry tissue of irradiated and of 

 control mice 24 hr after irradiation and 105 min after subcuta- 

 neous injection of NaCHg i^COO 



Table 8. — Percentage Change in the "C Uptake by Tissue Fraction of Fed 

 FrLLY grown Mice Due to Irradiation with 880 r. 



Fraction 



Liver 



% I mean 

 change deviation 



Intestinal 

 mucosa 



/o 

 change 



mean 

 deviation 



Muscles 



0/ 



/o 



change 



mean 

 deviation 



Dry tissue 

 Total fats 

 Proteins . . 



± 8.5 

 ±31.3 

 ± 3.6 



Fraction 



Kidney 



/o 

 change 



mean 

 deviation 



Lungs 



% 

 change 



mean 

 deviation 



Brain 



change 



mean 

 deviation 



Plasma 



% 

 change 



mean 

 deviation 



Dry tissue 

 Total fats 

 Proteins . . 



3.8 



