some physicochemical properties of partially purified hypothalamic material from the spontaneously hypertensive rat , and of plasma from man and the rat , have been characterized using a validated cytochemical bioassay which measures the ability of biological fluids to stimulate fresh guinea-pig kidney glucose-6-phosphate dehydrogenase ( g6pd ) after 2 min of exposure to the test substance , as an indication of their ability to inhibit na+/k+ adenosine triphosphatase ( na+/k+-atpase ) after 4-6 min of exposure .
C0005889
fluids
C0439861
substance