Analysis of the transmembrane potential of embryos exposed to action of nickel, cobalt, tin and zinc


  • G. V. Galyk Danylo Halytsky Lviv National Medical University
  • Z. Y. Fedorovych Danylo Halytsky Lviv National Medical University
  • E. I. Lychkovsky Danylo Halytsky Lviv National Medical University
  • D. I. Sanagursky Ivan Franko National University of Lviv
Keywords: autocorrelation; cross-correlation; lag; time series; heavy metals

Abstract

Germ cells of aquatic organisms are complex systems whose growth and development depends on many factors, one of which is the composition of the aquatic environment. We used parameters in our analysis from aggregate data available from published literature. They are data of the transmembrane potential of the germinal cells of Misgurnus fossilis (Linnaeus, 1758) at the development stage from 180th to 360th minutes. Embryos were incubated in an environment with nickel, cobalt, tin, and zinc ions and without them. Plotted lines of the transmembrane potential were digitized and calibrated at intervals of 10 minutes. Rows of numerical values of the transmembrane potentials were obtained. These rows were used for calculation of autocorrelation and cross-cross-correlation functions. It was established that the transmembrane potential describes nonperiodic and quasi-periodic oscillations. The higher statistically significant values of the autocorrelation coefficients were observed in the first lags. Autocorrelation analysis indicates that the periods of oscillations of the transmembrane potential increase with the action of nickel, cobalt, tin and zinc on the germ. The phenomena and processes that occur in the germ cell are well reflected at the initial stages of the auto-correction and are lost when the magnitude of the lag increases. The degree of similarity of transmembrane potentials with the help of cross-correlation analysis is quantitatively characterized. The distribution of fluctuations of cross-correlation functions with complex dynamics, which arise with time shifts both in the forward and reverse directions, were established. It is established that for large values of time shifts, the cross-correlation coefficient is a low-informative indicator, since information about the influence of the factor on the living system is lost. A graph for a given time shift was constructed. The connection between the nodes is the magnitude of the cross-correlation coefficients between the vapor of the transmembrane potentials, which indicate the degree of similarity of the bioelectric processes. Graphs will be used for qualitative and quantitative study of system dynamics. The obtained results confirm the existence of a close relationship between environmental nickel, cobalt, tin, and zinc and the oscillation of transmembrane potential during early embryogenesis.

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Published
2018-04-10
How to Cite
Galyk, G. V., Fedorovych, Z. Y., Lychkovsky, E. I., & Sanagursky, D. I. (2018). Analysis of the transmembrane potential of embryos exposed to action of nickel, cobalt, tin and zinc. Regulatory Mechanisms in Biosystems, 9(2), 216-222. https://doi.org/https://doi.org/10.15421/021832

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