... provides an alternative to the classical concept of animal plasma membrane energization by the Na + -motive force generated by the Na + /K + -ATPase. © 1992 by Company of Biologists 1992 V-ATPase plasma membrane potassium pump Manduca sexta midgut Insect ion-transporting epithelia...

..., and not a concentration-dependence of the pump, that exercises the major role in determining the relationship between extracellular (K +) and net K + transport by the isolated gut. 2 9 1987 © 1988 by Company of Biologists 1988 Manduca sexta midgut K + transport goblet cell membrane potential...

... sexta midgut K + transport membrane potential ion-selective electrode Lucifer Yellow barium short-circuit current The isolated midgut of the tobacco hornworm larva (Manduca sexta) actively transports K + from basal (haemolymphal) to apical (luminal) side. The preponder-ance...