the results indicate that the inner and outer protoplasmic surfaces differ , for when both surfaces are in contact with the same solution ( cell sap ) there is an electromotive force of about 15.9 millivolts , the inner surface being positive to the outer ( i.e . the positive current tends to flow from the inner surface through the electrometer to the outer surface ) .
C0175996
protoplasmic
C0007634
cell