STUDIES ON THE METABOLISM OF PHOSPHORUS IN ANIMALS 



1f)l 



T.VBI.K 7 



As is seen from the above figures the muscles show a somewhat larger 

 content of rad. P than an equal weight of the bones. The active I^ 

 content of the brain ash is decidedly lower. To ascertain if the phos 

 phorus atoms present are not acid soluble, phophorus compounds are 

 also replaced by active P atoms, and the brain treated with 6 per 

 c(>nt trichloracetic acid solution. By this means all the acid soluble 

 phosphorus was removed. The operation was carried out with great 

 care. After igniting the filtrate and residue, the activity of both 

 Tractions was measured. We found both fractions to be active, the 

 activity of the phosphatide fraction being about i/a of that of Ihc 

 trichloracetic acid extract. We are engaged in following up this point 

 in greater detail, using more trustworthy methods of separation. 



EXCHANGE OF PHOSPHORUS BY GROWING RATS 



The uptake of phosphorus shown by different organs of rats about 

 2 weeks old is seen in Table 8. The rats were killed three days after being 

 fed with radioactive phosphorus added to their normal diet. 



Focusing our attention first on the bones we notice that 100 mgm 

 of ash contain more than ten times as much radioactive phosphorus as 



Table 8 



11 H 



evssy 



