TURNOVER OF LECITHIN, CEPIIALIN AND SPHINGOMYELIN 



327 



Table 11. — Active Phosphatide Content of the 

 Liver anp the Plasma of Rabbits 



Phosphatide turnover in the corpuscles 



Compared with the phosphatide turnover going on in the organs, 

 the phosphatide turnover taking place in the corpuscles is but little. 

 This is also shown by results obtained when investigating the origin 



Table 12. — Extent of Partition of Labelled 



Phosphatides, Originally Present in the Pla.sma, 



between the Phosphatides of the Corpuscles and 



OF THE Plasma in Experiments in vitro 



(Plasma of a rabbit containing labelled phosphatides shaken 

 with corpuscles of another rabbit) 



of the yolk phosphatides(i). In these experiments, 28 hours after admi- 

 nistration of the labelled phosphate, the specific activity of the corpuscle 

 phosphatides w^as found to be only 1/3 of that of the plasma phosphati- 

 des; showing the corpuscles to be, so-to-say, a by-path of the liver and 

 other organ phosphatides on the way through the plasma into the yolk. 

 The labelled phosphatide molecules of the corpuscles have various 

 origins. Some of them were incorporated in the course of the red cell 



(1^ G. Hevesy and L. Hahn, Kgl. Danske Vidensk. Selfkab. Biol. Medd. 14, 

 2 (1938). 



