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The second contribution is associated with negatively charged hyaluronate polyions. Our results show that the molar conductivity of polyion is  EMBED Equation.DSMT4  and that it slightly decreases with the polyion concentration (c). Standard theories predict that the molar conductivity of polyion is given by  EMBED Equation.DSMT4 , where  EMBED Equation.DSMT4  is the correlation length and f is the proportion of free counterions. In the case of Na-HA which is a weakly charged polyelectrolyte f should be equal to one, i.e. all counterions are free. Our dielectric relaxation data show that the correlation length  EMBED Equation.DSMT4  behaves like  EMBED Equation.DSMT4 , and we get  EMBED Equation.DSMT4 . This means that the concentration dependence of the polyion conductivity is only due to the concentration dependence of the effective proportion of free counterions. 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