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“ Tolbutamide diminishes the activity of Ca ,Mg-ATPase in native membranes by 25% without causing any appreciable influence on the enzyme activity in dephosphorylated membranes.”
“Addition of tolbutamide to a medium containing 6 mM glucose and calcium increased Rb+ efflux transiently with 20 micrograms/ml and permanently with 100 micrograms/ml.”
“In contrast to an analogue lacking effects on insulin release, tolbutamide stimulated the intracellular net uptake of 45 Ca as well as the efflux of the isotope.”