ouabain-sensitive atpase ( na-k-atpase ) activity of haemolysate but not that of membranes was decreased in hypertensives whereas ouabain-insensitive atpase ( mg-atpase + some residual ca-atpase ) activity was increased in both enzyme preparations when measurements were preformed in the absence of ca2+-chelating substances .
C0001479
na-k-atpase
C0001473
atpase