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Biomedical subjects

E V Nikolaev

Publications and source records attributed to E V Nikolaev.

5 recordsLinked to original sources
PubMed1996

[Early postoperative acute cholecystitis].

Among the relatively rare complications occurring after various operations acute cholecystitis attracts particular attention. Its genesis is elucidated differently in the literature. In addition to the literature information discussed in the work, the authors, possessing experience in the treatment of 14 patients with such postoperative cholecystitis, give a clinical characteristic of its manifestations and recommendations in respect to its early diagnosis and surgical tactics. The authors claim cholecystectomy to be the method of choice and, in extremely aggravated cases, decompression microcholecystectomy.

Acute Disease↗
PubMed1994

In-phase and antiphase self-oscillations in a model of two electrically coupled pacemakers.

The dynamic behavior of a model of two electrically coupled oscillatory neurons was studied while the external polarizing current was varied. It was found that the system with weak coupling can demonstrate one of five stable oscillatory modes: (1) in-phase oscillations with zero phase shift; (2) antiphase oscillations with half-period phase shift; (3) oscillations with any fixed phase shift depending on the value of the external polarizing current; (4) both in-phase and antiphase oscillations for the same current value, where the oscillation type depends on the initial conditions; (5) both in-phase and quasiperiodic oscillations for the same current value. All of these modes were robust, and they persisted despite small variations of the oscillator parameters. We assume that similar regimes, for example antiphase oscillations, can be detected in neurophysiological experiments. Possible applications to central pattern generator models are discussed.

Animals↗
PubMedDate not supplied

[Static volt-ampere characteristics of biologically active human skin currents].

Results are presented of measuring static voltage characteristics of biologically active sites Xe-gy at various pressure of the measuring electrode on the skin. It has been shown that under other equal conditions conductivity of the active sites is 3 and more times higher than that of inactive sites in the whole range of the applied pressures. The current-voltage characteristics of biologically active sites are non-linear and have a region of reversible break-down on their inverse branch. With the currents higher than 200 divided by 300 muA an irreversible break-down of the site is formed, after which conductivity increases more than by an order.

Electric Conductivity↗