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S V Andreev

Publications and source records attributed to S V Andreev.

At least 55 records · Page 3Linked to original sources
PubMedDate not supplied

[Deterministic chaos in the dynamics of biomembrane ion channel current].

Within the framework of the theory of deterministic chaos, a nonlinear first-order differential equation with delay and relaxation with periodic influence on channel current for the parameter of order (deviation of channel current from the equilibrium value) was obtained. The numerical solutions of the equation indicate a chaotic dynamics of the order parameter and conformation potential of the channel protein with positive Lyapunov indices. By integration in the time interval between the "jumps" of ions through energy barriers of the channel protein, a mapping was obtained that also results in chaotic solutions realized in experiments. Basic kinetic characteristics of ionic channels for the mapping were obtained: the probability for the channel to be in the open state, P0, and the mean duration of a pack of current pulses depending on controlling parameters. Algorithms for constructing bifurcation diagrams with the transition to chaos and for determining Lyapunov indices and Kholmogorov entropy, pulsation spectra, and other parameters of chaotic dymanics were developed.

Cell Membrane↗
PubMedDate not supplied

[Ecological protection against volley discharges of radon from the installations of radon laboratories].

The authors analyzed the amount of radon waste and decay products discharged into atmosphere from radon laboratory units. Underlying principles of the design of radon escape monitoring and protection devices are considered. Relevant rating and the parameters of the apparatus developed to considerably limit the isotopes escape are presented. The apparatus is adjusted for current devices making radon concentrates.

Absorption↗