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Fig. 7. Influence of external pH on the uptake of 0.1 mmol l1
[14C]oxalate into hepatopancreatic BBMV. Vesicles contained 100
mmol l1 TMA-Cl, 50 mmol l1 K-gluconate, 50
µmol l1 valinomycin and 40 mmol l1
Hepes-Tris at pH 7.0. Incubation media contained 100 mmol l1
TMA-gluconate and 50 mmol l1 K-gluconate, and pH was
adjusted to 7.0 () or 8.0 (
) with Hepes-Tris, or pH 5.0 (
) or
6.0 (
) with Mes-Tris.