CIRCULATION- OF I'lrOSPHORUS IX THE FllO(; 



397 



Table 16. — Specific Activity of thk Phosphortts Fractions of thk Musclks 

 OF A Frog Kept at 20° for 4 Hours and Subseqentta- at 0° for 1 ITot:r 



Fniction 



r content 

 ill nitrin 



Counts 

 por min. 



Specific 

 nctivitv 



Relative 

 specitic 

 iictivitv 



Inorganic P 

 Creatine P . 

 Hexose P . 



Left gastrocnemius 



0.055 

 0.240 

 0.143 



427 



290 



98 



7770 



1210 



()8ti 



100 

 15.() 



8.7 



Inorganic P 



Creatine P 



Ilesidne after 17 hours livdrolysis 



Right gastrocnemius -{- .sartoriu.s 

 0.350 j 2500 7150 | 100 



0.908 I 1010 I 1110 ].-..() 



0.372 i 45 I 120 1.(58 



of the resting frog is, thus, quite appreciable even at 0° though not as 

 high as stated in a preHminary note'^^ At 20° the lowest figure found 

 after 4 hours is 16 per cent. 



Rate of interaction of the plasma phosphate and the cellular phosphate 

 of the muscle tissue 



In the preceding section, we calculated the rate of renewal, of the 

 organic P compounds present in the muscle tissue by comparing the 

 ^-P content of the tissue inorganic P with the ^^P content of the phos- 



Taule 17. — Specific Activity of the Phosphorus Fractions of the MtrscuEs 



of 2 Frogs Kept .^.t 0° for 17.5 Hours 



Frosj 



Friictiou 



P content 



Specific 

 activity 



Gastrocnemius 



Sartorius 



II 



Inorganic P 



Creatine P 



Product of 100 min hydrolysis . . . 

 Residue after 120 hours hvdrolvsis 



Inorganic P 



Product of 7 mill liydrolysis . . 

 Product of 17 hours hyth'olysis 

 Residue 



j Inorganic P 



Gastrocnemius i Creatine P 



II ( Inorganic P 



Sartorius |: Creatine P . 



0.330 

 0.474 

 0.220 

 0.070 



0.71)'.t 

 I.05(i 

 0.75S 

 0.24() 



0.39S 

 0.452 



0.475 

 0.r)!t4 



100 



29. S 



27.0 



2.0 



100 

 25.1 

 19.5 

 (5.8 



100 

 II.O 



100 

 10.1 



^i^G. IIevesy and O. Rebbe, Xalure 141, 1097 (1938) 



