Abstract— Dielectric spectroscopy was employed for monitoring biophysical parameters of Euglena gracilis in suspension to assess a possibility of using this method for a new biomonitoring system for detecting and identifying pollutants in aquatic environments. E. gracilis was subjected to different types of membrane-affecting toxic chemicals (1 mM chlorpromazine, 1 mM HgCl2, or 1 mM Triton X-100), and dielectric measurement of the cell suspension was carried out over a wide frequency range between 5 kHz and 3 MHz. All of these chemicals at the designated concentrations induced similar changes in cell motility of Euglena cells; flagellar activity was inhibited and rounding-up movement of the cell body was induced. These chemicals also induced distinct changes in dielectric properties of the cell suspension, but the manner of changes in dielectric behavior was unique to individual chemical species, suggesting a possible use of this technique for quick identification of toxic materials in aquatic environments.
Keywords— Biomonitoring, Dielectric spectroscopy, Impedance.
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