second , the volume average of the magnitude of intracellular electric field is shown to have an upper bound given by the ratio of the magnitude of the largest extracellular potential difference on the surface of the cell to a generalized length constant lambda = [ sigma ( intra ) v ( cell ) / ( sigma ( memb ) a ( cell ) ) ] ( 1/2 ) , where v ( cell ) and a ( cell ) are the volume and surface area of the cell , sigma ( intra ) is the intracellular conductivity ( reciprocal ohms per centimeter ) , and sigma ( memb ) is the membrane conductivity ( reciprocal ohms per square centimeter ) .
C0007634
cell
C0699040
surface