Lecture 6 



— 133 



Biochemical Problems 



In the tissue, the proportion of organic acid to base 

 is decreased and possibly by selective oxidation the 

 relations of acids of different dissociation constants 



0.0005m 

 Ca SQ4 



0.C03M 

 Ca SO4 



0.005 M 

 RBr 



0005 M 

 KNOj 



0.002 5 m 

 CaB'2 



0.002 5M 

 CalNOjlj 



0.005M 

 KHCOj 



O.00I67M 

 K CITRATE 



0.002 5M 

 (NH^J^SO, 



8 120 160 200 



RESPIRATION IN C.C. PER 100 

 GM. FRESH WT. OF ROOTS 



Textfigure 37. — Respiratory quotients (CO2 

 produced/O: absorbed) of young barley roots as 

 influenced by selective ion absorption. From K 

 salts the K ions are often absorbed in greater 

 equivalent amounts than the anion. Organic a^id is 

 synthesized and O2 absorbed exceeds CO- produced. 

 A very large disproportion is found when absorp- 

 tion occurs from a KHCO3 solution. The bicarbonate 

 ion does not accumulate appreciably in the roots. 

 From some calcium salts the CO2 produced exceeds 

 the O2 consumed, with a tendency for organic acid 

 to decrease. (From Ulrich, 1941). 



are altered. Excess absorption of anions is in general 

 characteristic of roots absorbing from solutions of 

 calcium salts with mobile anions like calcium bromide. 



