1058 



PROTEIN METABOLISM 



[PT. Ill 



acids. As Table 131 shows, Calvery found no change in acid melanin, 

 amide, or cystine fractions, a fall followed by a rise in the arginine 

 fraction and a rise in the lysine fraction. His data, however, differed 

 from those of previous workers by including the shells, so the subject 

 is by no means closed and in spite of the large amount of laborious 

 work that has been done on it we cannot as yet be said to know 

 much about the origin of either the nucleins or the incombustible 

 end products. The change over from amino to non-amino nitrogen 

 in the filtrate from the bases, which appears in all three sets of figures 

 may be due to the accumulation of proline and oxyproline. 



Sznerovna's figures: 



Days Proteins of 



o White 



Yolk 



White and yolk massed 

 14 Embryo 

 18 Embryo 



White and yolk massed 



Table 132. 



% of the total nitrogen 



Ammonia Melanin 



nitrogen 



6-64 

 7-88 



lit 



5-98 



7-14 



nitrogen 



0-73 

 i*6o 

 3-02 

 2-46 

 1-45 



Di-amino Mono-amino 



nitrogen 



64-52 

 66*02 

 65-12 

 58-15 

 64-07 

 64-77 



nitrogen 

 26-66 

 25-37 

 26-14 

 33-25 

 27-49 

 26-64 



Calvery's figures for whole c^gg (including shell) : 



Histidine nitrogen % of total nitrogen 



