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Laser diagnostics of daphnia oscillations

The method based on the autodyne effect in semiconductor laser has been described to the analysis of dynamical behavior of biological specimen. The advantage of the method has been shown in comparison with tradition photoelectrical methods. The experimental investigations of the effect of external alternating voltage on the amplitude and frequency of fresh water crawfish - daphnia have been implemented. The synchronization effect of daphnia heart beating by the external electric field has been discovered. The investigation results of the dependence of daphnia heart beating frequency on the water toxicity degree.