660 



ADVENTURES IN RADIOISOTOPE RESEARCH 



CIRCULATING HEMOGLOBIN 



For the above-mentioned reason the ratio of the specific activities 

 of the hemoglobin iron of the embryo and the mother, as seen in Fig. 5 

 is larger in the exposed animal than in the control rabbit (mean ratio =: 

 = 1.66). When comparing the percentage of activity present in the 

 maternal organism at the end of experiment with the activity of 1 /^gm 

 hemoglobin iron, the data seen in Fig. 6 are obtained, while Fig. 7 

 shows the corresponding figures for the embryonal organism. Both 

 figures indicate depressed hemopoiesis. 



LIVER NUCLEAR HEMOGLOBIN 



As found by Bonnichsen and Hevesy (1955 b) the nuclear fraction 

 of the liver contains small amounts of hemoglobin inextractable with 

 aqueous solution. The depressed hemopoiesis of this hemoglobin fraction 



2 - 



I - 



0,5- 



foetal 



m a t e r n a 



sA 



R. 



'/ 



\ 

 I 



M 



/ > 



Fig. 9. Ratio of the specific activity of nuclear hemoglobin Fe and 



circulating hemoglobin Fe. 



