EFFECTS OF THYROXINE AND RELATED COMPOUNDS ON EIVKR MITOCHONDRIA 



m M 



Fig. 2. Effect of L-thyroxine, DL-triiodothyronine and desaminothyroxine on 

 the ATPase activity of mitochondrial fragments prepared according to Kielley 

 and Kielley [80]. For experimental details see [84]. 



Desaminothyroxine o 

 Thyroxine a 



noMg** Mg'^^^mM 



'0 01 



m M 



Fig. 3. Effect of added Mg " ^ on the sensitivity of the dinitrophenol-induced 

 ATPase activity of rat liver mitochondria to DL-thyroxine and desaminothyroxine. 

 When indicated, Mg + + was added in a final concentration of 4 mM. Other experi- 

 mental conditions as in Fig. i. 



