the maximal capacity of total brown adipose tissue for norepinephrine-stimulated respitarion was estimated at 1.5 ml o2/min per rat . beta-adrenergic agonists increased calorigenesis stereospecifically with an order of potency expected for respiratory stimulation via adrenoceptors of the beta 1-subtype : ( - ) -isoproterenol ( 1/2 vmax = 2 nm ) greater than ( - ) -norepinephrine ( 1/2 vmax = 20 nm ) approximately equal to ( - ) -epinephrine ( 1/2 vmax = 40 nm ) greater than corresponding ( + ) -stereoisomers .
C0028351
norepinephrine
C0014563
epinephrine