Adenine nucleotides of myocardium from rats treated with isoproterenol and-or Mg- or K-deficiency.

The contents of adenine nucleotides of myocardium from rats treated with isoproterenol and/or dietary Mgor K-deficiency were measured. And also, the fatty acid composition of phospholipid fractions of liver from rats fed control diet, a Mgand/or K-deficient diet for 20 days is presented. Both the administration of isoproterenol and the dietary Mgor Kdeficiency produced the significant decrease of ATP. However, the relative ratio among ATP, ADP and AMP did not show any remarkable changes. By feeding a diet containing low K and/or Mg, the fatty acid compositions of phospholipids from rat liver were changed.