Laboratoire de Nutrition minérale, Faculté des Sciences de Rouen, 76130 Mont-Saint-Aignan, France.
Plant Physiol. 1978 Oct;62(4):477-81. doi: 10.1104/pp.62.4.477.
From our theoretical treatment which is an extension of the classical Donnan theory, we have estimated the rational selectivity coefficients of the carboxylic groups of the walls during exchanges of divalent ions against monovalent ones (i.e. calcium and potassium or calcium and sodium ions). 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 calcium ions. They vary with the experimental conditions, showing a purely physicochemical mechanism of "regulation" of the exchanges in the cells walls of Lemna minor L.
从我们的理论处理,这是经典的唐南理论的扩展,我们估计了二价离子与单价离子(即钙和钾或钙和钠离子)交换时壁上羧酸基团的合理选择性系数。这些系数表示不同离子之间的相互作用,反离子与壁上离子化基团之间的相互作用,以及水的影响。这些定量值与羧酸基团对钙离子的高亲和力一致。它们随实验条件而变化,显示出浮萍细胞壁交换的“调节”的纯物理化学机制。