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- W2018798830 abstract "Abstract Ion substitutions and ion-selective microelectrodes were used to study the steady state potential (Em) between the oocyte and the medium surrounding ovarian follicles in Hyalophora cecropia, a system developing in a high K + low Na + haemolymph. Potassium channels were affected by the osmolarity of the medium, being maximally open at 300 mOsm, the osmolarity of the native haemolymph. In a 300 mOsm medium, Em changed 26 mV/decade change in [K+]0, and was slightly positive to Ek (1.9 mV; P = 0.035). In most follicles, Em did not vary with changes in [Cl−]0. Follicles with small Em (−20 to −30 mV), by contrast, included some that depolarized on removal of external Cl−; after several minutes, these follicles subsequently hyperpolarized spontaneously and at the same time adopted the more common Cl− impermeable state. Under physiological conditions, with K+ channels open and Cl− permeability low, protons also contributed to Em, which changed at a rate of 14 mV/pH unit change; when K+ channels were blocked with tetraethylammonium/Ba2+, this slope increased to >40 mV/pH unit. Since the cytosolic pH of follicles incubated in the standard pH 6.5 incubation medium averaged 7.3, EH is very positive to Em. Calculations from chord conductance theory indicated that the measured Em would be achieved if gk = 49·gH. Together, H+ and K+ accounted for up to 69% of the measured steady state potential; chilling the cells mimicked previously reported treatment with azide or vanadate, and confirmed that one-third to one-half of the steady state potential is metabolically maintained." @default.
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- W2018798830 date "1992-01-01" @default.
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- W2018798830 title "Steady-state potentials in ovarian follicles of a moth, Hyalophora cecropia" @default.
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