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1.
In acute experiments on cats the activity of the motor cortex neurons was recorded. The dynamics of interneuronal connections at passive bending and electrostimulation of the limb contralateral to the place of recording was studied by methods of cross-correlation analysis of impulse trains. At passive bending a considerable decrease of the number of common inputs between neighbouring neurons (within 50-100 microns) and an increase in their number between remote (from 100 till 400 microns) cortical neurons. During electro-stimulation a certain increase in the number of direct inhibitory interactions between the neighbouring neurons was observed. 相似文献
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Energy-selective neutron radiography and tomography at FRM. 总被引:1,自引:0,他引:1
Nikolay Kardjilov Burkhard Schillinger Erich Steichele 《Applied radiation and isotopes》2004,61(4):455-460
At the reactor FRM at Technical University of Munich energy-selective neutron radiography and tomography experiments were performed. For an energy separation of the neutrons from the primary beam a mechanical velocity selector was used. The radiography images show a different contrast of the investigated elements for neutron energies below and above their Bragg-cutoff energy. A comparison between the standard and energy-selective neutron tomography is presented. In spite of a reduction of the neutron intensity due to the velocity selector technique a realistic experimental time in order of some hours for the tomography experiment was achieved. 相似文献
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Multineuron activity was recorded from the sensorimotor cortex of the right and left hemispheres during immobilization catatonia in rabbits. The first session of immobilization of the animals was followed by changes in spike frequency in 47% of neurons in the sensorimotor cortex of the right hemisphere. Of these, 30% showed decreases in spike frequency and 17% showed increases. Spike frequency in the sensorimotor cortex of the left hemisphere changed in only 18% of cells, of which 13% showed decreases in spike frequency and 5% showed increases. The spike frequency of neighboring (recorded with the same electrode) neurons could change reciprocally. Differences in neuron activity in the two hemispheres were virtually absent after the second session of immobilization (several days after the first) – spike activity changed in 21% of neurons in the right hemisphere and 24% in the left hemisphere. The ratios of the numbers of neurons with increases and decreases in spike activity in hypnosis also became identical in the cortex of the right and left hemispheres. A hypothesis is proposed for the involvement of cortical neurons in the organization of hypnosis-like states. 相似文献
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A conceptual-logical and mathematical approximation model has been created for the organism's response to external factors.
The mathematical model of the “dose-effect” dependence for the combined effect of several factors is constructed using the
basic equation of the Volterra mathematical theory of the struggle for existence.
Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 117, N
o
3, pp. 328–331, March, 1994
Presented by L. A. Tiunov, Member of the Russian Academy of Medical Sciences 相似文献
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George S. Stoyanov Deyan Dzhenkov Lilyana Petkova Nikolay Sapundzhiev Svetoslav Georgiev 《Head and neck pathology》2021,15(2):402
Frank’s sign is a diagonal crease of the ear lobe, supposedly related to cardiac pathology, and has strongly been associated with coronary artery atherosclerosis. A total of 45 consecutive adult patients referred for autopsy in a one-and-a-half-year period were extensively studied. Samples from both the ear lobes were obtained for histopathology, as well as cardiac samples from all four cardiac compartments. When compared patients with Frank’s sign and those without it had no statistical difference in age (p = 0.0575). There was however a statistically significant increased cardiac weight (p = 0.0005), left ventricular wall thickness (p = 0.0002), and right ventricular wall thickness (p = 0.0043). Histopathology obtained from the ear lobes revealed myoelastofibrosis in an arterial vessel, located at the base of the crease, diffuse fibrosis, and Wallerian-like degeneration, with eosinophilic inclusions in the peripheral nerves. These changes suggest a time-related progression of the crease-associated changes. Our data suggest a significant correlation between the morphological changes of the myocardium and the presence of the ear lobe creases, with arterial myoelastofibrosis, Wallerian-like degeneration in peripheral nerves and deep tissue fibrosis found in the base of the crease. 相似文献