212 



.VDAEXirRES IN RADIOISOTOPE RESEARCH 



the water. The skeleton contained 1/5.3- 10* part of the activity added 

 to the water, thus of the 3.98 mgm P present in the skeleton, 1.4- \()-^y 

 were such which originate from the labelled phosphate added lo 1 Ik^ 

 sea-water. 



The results obtained for different parts of the skeleton are conijni- 

 ted in Table 3. 



/ 



Table 3. — Percentage Ratio of the Activitv of 1 -M(;m 

 Skeleton P and 1 mgm Free Liver P 



From the above figures, the average value for the percentage ratio 

 of the activity of 1 mgm skeleton P and 1 mgm liver P works out to be 2.5 

 per cent in the course of 22 days. To obtain the percentage renewal of 

 the fish skeleton in the course of 22 days, we have to multiply the above 

 figure (cf. p. 209) by a figure which is less than 2. The rate of renewal 

 thus lies between 2.5 and 5 per cent. 



UPTAKE OF LABELLED FHOSPHORLS BY THE EGGS 



In several fish, a large number of eggs was found and in many cases 

 the weight of the eggs constituted a very appreciable percentage of the 

 weight of the fish. In experiment No. 16 B, the eggs' weight was found 

 to be 0.92 gm out of a weight of 2.44 gm of the fish (including eggs), i. e. 

 38 per cent. The percentage ratio of the activity of 1 mgm average fish P 

 (minus eggs) and 1 mgm free liver P was found to be 6.3. For the percen- 

 t age ratio of the activity of 1 mgm egg P and 1 mgm liver P, 90 was obtained . 

 Thus, almost all P of the atoms present in the egg was incorporated 

 into the eggs in the course of the last 23 days. The total P content of the 



