OHKil.N OF l'll()SJ'JlOia>; CO.Ml'OIMJS J.\ JIK.NS' K(;(;S 



28: 



oxporiniont, wlunc^ the peiconta^o of 

 pUisma nearly icac-hod tliat found i 

 concentration gradient in the flow 

 liver into the plasma is very clearly s 

 led molecules in the ovary phos- 

 phatide is, on the other hand, 

 much smaller than in the j:)lasma 

 phosphatides. From this it follows 

 that the labelled phosphatide mo- 

 lecules present in the ovary were 

 within 5 hours only partly leplaced 

 by ones present in the plasma. 

 We investigated a yolk weighing 

 1.0 gm. The figures obtained are 

 given in Table 12. A second yolk 

 investigated w'eighed 2.7 gm. and 

 its lecithin P had a specific acti- 

 vity of 0.0050. The specific act- 

 vity of the yolk lecithin of the first 

 mentioned yolk was found to be 

 about Vii of that of the plasma 

 lecithin. From these figures it 

 follows that about Vii of the 1.0 

 gm i. e., 0.09 gm of yolk were 

 giown within 5 hours. The actual 

 growth was, however, presumably 

 greater than 0.09 gm, since in 

 the early stages of the experiment 

 the plasma phosphatide was only 

 very shghtly active and so was the 

 yolk tissue formed in this phase 

 of its development. The fact that 



newly formed phosphat i(l(> molecules in the 

 n the liver, in the 5 hours experiment the 

 of labelled phosphatides directed from the 

 liown (comp. Fig. 3). The percentage of label- 



spieen 



— PiQ' mo 



---^3^ Inrestine 



Fig. 3. The heaviness of the sha- 

 ding indicates the specifier activity 

 of the lecithin P and thus the per- 

 centage of the phosphatide mole- 

 cules formed within the last five 

 hours in the total phosphatides of 

 the organ in question. 



Tablp: 12. — Specific Activity of Phosphatide P 



