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- W3149659945 abstract "We have used a spectrophotometric method to monitor mean free extracellular calcium concentrations in isolated left atria of guinea pigs via extracellular application of the calcium-sensitive absorption dyes, antipyrylazo III and tetramethylmurexide. Exchange of extracellular free calcium with the bathing medium takes several minutes and closely parallels contractile response in this preparation. Under conditions favoring a rapid positive force staircase response during repetitive stimulation after a long rest period (2-10 minutes), cumulative depletions of extracellular calcium can clearly be differentiated from motion artifact due to muscle movement by multiple-wavelength spectrophotometry. Responses of similar magnitude and characteristics are obtained with both dyes employed. In the presence of 10(-7) M isoproterenol, the mean extracellular calcium concentration falls by at least 5% (0.25-0.8 mM total calcium concentration) in four beats at 0.5 Hz; extracellular calcium replenishes during rest with an..." @default.
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- W3149659945 date "1983-01-01" @default.
- W3149659945 modified "2023-09-24" @default.
- W3149659945 title "Activation-dependent cumulative depletions of extracellular free calcium in guinea pig atrium measured with antipyrylazo III and tetramethylmurexide." @default.
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