native sarcolemma ( sl ) from adult canine cardiac myocytes ( na+-k+-atpase activity 74.2 +/- 3.0 mumol x mg-1 x h-1 ) was preincubated ( 10 min , 37 degrees c , ph 7.2 ) with 1 ) 20-600 microm palmitoyl carnitine , 2 ) 250 nm-2.5 mm propranolol , or 3 ) 20-600 microm palmitoyl carnitine plus propranolol at various concentrations ( 0.0 , 0.025 , 0.25 , 0.5 , 1.0 , and 2.5 mm ) ;
C0030242
palmitoyl carnitine
C0007258
carnitine