concentrations of catecholamines required to increase tension and rate of contraction 50 % of the maximum obtainable with isoproterenol were 1.5 x 10 ( -7 ) m and 1.7 x 10 ( -8 ) m for trimetoquinol and isoproterenol , respectively .
C0007412
catecholamines
C0022245
isoproterenol