TRANSFORMATION OF FREQUENCY DISPERSION OF ELECTRICAL PARAMETERS OF LIVER TISSUES DEPENDING ON STORAGE TEMPERATURE

Abstract

Introduction. Presented article discusses the temporal transformation of frequency characteristics of the few of studied electrical parameters of liver tissues during their storage at temperatures ranging from 2 °C to 35 °C.

Methods. The cells for the studies were made from the plastic body of a 2 ml medical syringe. The ends of the cylindrical sample were in contact with a nickel mesh. Nickel conductors welded to the mesh served as a current collector. Cylindrical samples with a height of 1.2 cm, a diameter of 2 cm and a mass of 1–1.5 g were placed in a specially designed, hermetic thermostat 1/120 SPU under the influence of temperatures of 2 °C, 8 °C, 12 °C, 25 °C and 35 °C for 2, 5, 8, 10 and 14 hours.

Results. The study examines and provides the description of changes in direct current conductivity, the frequency dispersion of the real component of conductivity, tangent of the dielectric loss angle within the frequency range of 0.01 Hz to 100 kHz (the beta-dispersion range) and resonance frequency. The functional relationship between the transformation of the thermal-time dependence of electrical parameters and the degree and nature of morphological changes in biological tissues has been established.

Conclutions. Local values and the direction of monotonicity of the polarization relaxation time function in the studied frequency range can be considered as a criterion for determining the degree and type of destructive changes in experimental tissues which were stored in the air at different temperatures and time periods.

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