An apparatus designed to compare small differences between the impedance modulus of two identical cells when the measurement frequency is varied from 0.1 to 500 Hz is described. The resolution is typically about 105. The electrode polarization errors are eliminated by using two four-electrode cells. This apparatus is used to determine the very-low-frequency dielectric relaxation spectrum of DNA solutions.
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Bernengo et al. (1976) studied this question.
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