It is shown by means of IR. spectroscopic methods that nigericin and monensin have a cyclic conformation similar to that of their silver salts. Complex formation constants with sodium and potassium ions follow the selectivity order determined by EMF. measurements on liquid membranes: nigericin: K + > Rb + > Na + > Cs + > Li + ; monensin: Na + > K + > Li + > Rb + > Cs + . Transport experiments show that nigericin and monensin facilitate the diffusion of potassiumions across model membranes, although in electrolytic transport experiments the permeability is not affected.
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Lutz et al. (1970) studied this question.
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