Exchange Properties of Isolated Cell Walls of Lemna minor L.

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Abstract
From the theoretical treatment which is an extension of the classical Donnan theory, the rational selectivity coefficients of the carboxylic groups of the walls during exchanges of divalent ions against monovalent ones (i.e., Ca and K or Ca and Na ions) were estimated. These coefficients express the interactions between the different ions, those between the counter-ions and the ionized groups of the wall, and the influence of water. These quantitative values are consistent with the great affinity of the carboxylic groups for the Ca ions. They vary with the experimental conditions, showing a purely physicochemical mechanism of regulation of the exchanges in the cells walls of L. minor L.
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