OXYGEN AND RESPIRATION 



105 



tissue (Usuki and Okamura, 1956). The effect of fluoride, which 

 forms a complex with magnesium and phosphate, may be reduced 

 by the addition of pyruvate or succinate, but not by the addition 

 of glucose. 



Phospholipids 



k 

 14 



Keto pyruvic acid 



15 



Fatty acid cycle ^ r 



16 



'2H to Co I 



CO., 



Fatty acids 



Acetyl Coenzyme A 



17 



Citric acid 



Cis Aconitic acid 



Iso Citric acid 

 20 



i^. 



-►2H to Co II 



Oxalosuccinic acid 



Jk 21 >-CO, 



2H to FP or 



Cytochrome 



Fumaric acid 



Malic acid 

 25- 



->-2H to Co I 



Oxaloacetic acid 



I 



Fig. 27. The citric acid or tricarboxylic acid cycle. The 

 stages shown are referred to in the text by the numbers given 



in this figure. 



(iii) Sodium azide and 2-4-dinitrophenol (DNP) affect phos- 

 phorylation reactions such as stage 4, and treatment with both 

 azide and DNP led to an accumulation of fructose-6-phosphate 



