in order to determine the effect of the k+ ions on enzymic physiological efficiency ( phys . eff . ; i.e. , the ratio vmax/kmapp ) the variation of ( na+ , k+ ) -atpase activities from each brain fraction was measured as a function of mg.atp2- concentration in the presence of 5 and 20 mm k+ ions .
C0006104
brain
C0086045
function