362 



GEORGE BOSWORTH BROWN AND PAUL M. ROLL 



TABLE IV 

 Incorporations of Various Precursors into the PNA of Intestine and Liver 



(Rat)" 



" Contractions used are explained in Table II, footnote a. 



*" Time interval following administration. Two figures represent the duration of administration and the 

 time interval following last administration. 



' N'^ in hypoxanthine and xanthine derived by deamination. 



"^ 1.9 mM. adenine per kg. per day. 



' 0.2 mM. adenine per kg. per day. 



■^ 0.4 mM. adenine per kg. per day. 



o Of mixed nucleic acids. 



'' Relative to the specific activity of inorganic P of total rat; the values presented as relative to the specific 

 activity of inorganic P of the respective organs have been most frequently quoted, these are 3.45 and 6.1, 

 respectively. 



II, columns 11 and 12). In view of the considerable metabolic (Chapter 26) 

 and compositional (Chapters 11 and 18) differences between nuclear PNA 

 and the several cytoplasmic PNA's it must be recognized that most of the 

 data quoted in Tables II, IV, and V represents averages of the several 



109 P. Reichard, /. Biol. Chem. 179, 773 (1949). 



