Experimental Physiology
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Experimental Physiology 76.2 pp 277-280
© The Physiological Society 1991
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Experimental Physiology, Vol 76, Issue 2, 277-280
Copyright © 1991 by The Physiological Society

Article

Endogenous transmembrane electrical gradients associated with human placental microvillous membrane vesicles

DB Shennan and D Reid

Experiments were designed to test for the presence of an endogenous (i.e. Donnan) electrical potential in human placental microvillous membrane vesicles. Vesicles were capable of passively accumulating K+ (86Rb+) above unity in a manner which was influenced by both pH and ionic strength of the medium. It appears that the transmembrane electrical potential is generated by the presence of fixed negative charges associated with the vesicle interior.




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Copyright © 1991 by the The Physiological Society.