our results are summarized as follows : ( 1 ) cho cells maintained the same relationship between phe and phi in four different media or buffers ( mccoy 's 5a medium buffered with co2 and nahco3 or 4- ( 2-hydroxyethyl ) -1-piperazineethanesulfonic acid ( hepes ) and 2- ( n-morpholino ) ethanesulfonic acid ( mes ) , krebs-ringer bicarbonate solution , and krebs-ringer phosphate solution ) with phi being 0.05 to 0.20 ph units higher than phe as it varied from 7.0 to 6.4 ;
C0074722
nahco3
C0005367
bicarbonate