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- W1995873934 abstract "Within 7 hr after fertilization, the fucoid egg's membrane potential rises from about −20 mV to −80 mV (Fig. 4) and within 12 hr after fertilization its conductance rises 8-fold (Fig. 7). Its changing responses to rapid individual ion concentration changes (Table 1) imply permeability changes which help explain these electrical ones: Thus the resting potential and conductance of the unfertilized egg seem to be mainly explained by pathways jointly permeable to K+, Mg2+, and to a lesser degree Na+; those of the developing egg by potassium channels in parallel with less conductive chloride channels. In the unfertilized state the egg's membrane is passive; by a few hours after fertilization it responds sharply and within 1 msec to imposed currents sufficient to shift its potential by more than 20 mV; responding to outward current by reducing the resultant voltage change and to inward current by increasing it (Figs. 6 and 7). It is speculated that these responses may respectively serve to start and stop natural transcellular current surges. Finally, the scattered literature on comparable electrical changes in developing eggs, from algae to amphibians, is culled and organized (Table 7); the main features shown by the fucoid egg are remarkably general." @default.
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- W1995873934 date "1972-04-01" @default.
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- W1995873934 title "Membrane potential and impedance of developing fucoid eggs" @default.
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- W1995873934 doi "https://doi.org/10.1016/0012-1606(72)90193-5" @default.
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