to accomplish this , extracellular potassium ion activity ( k+o ) was recorded by ion-selective microelectrodes while reduction/oxidation ( redox ) ratios of cytochrome oxidase ( cytochrome a , a3 ) were monitored by reflection spectrophotometry in cerebral cortex of rats anesthetized with pentobarbital .
C0030012
reduction/oxidation
C0010798
cytochrome