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Biomedical subjects

V V Ur'iash

Publications and source records attributed to V V Ur'iash.

9 recordsLinked to original sources
PubMed1985

[Ultrastructure of cells of the lateral field of the hypothalamus of the cat after exposure to electromagnetic radiation].

Under the effect of electromagnetic radiation not any specific changes are revealed in the neural system unequivocally characterizing disturbances in its structure as a result of an excess absorption of electromagnetic energy. The ultrastructural changes revealed in the lateral fields of the cat hypothalamus are suitable for a well known scheme demonstrating the course of the pathological process, where three phases are distinguished: reactive, destructive and restorative. The pathological process develops gradually. The reactive changes in neurons and synapses, observed immediately after withdrawal of the electromagnetic action. increase during the following three months and result in coarse destructive disorders and in death of some neurons and synapses. In 6 months certain signs of restoration of the structures are observed. Under the effect of electromagnetic radiation water redistribution between the structures takes place, the sympathetic terminals loosing their fluid. Thus, certain conditions are produced for sticking together the synaptic vesicles. Possibly that deficiency of Ca++ ions contributes to it.

Animals↗
PubMed1979

[Adaptive modification of neurophysiologic and vegetative processes during positive food and negative taste autoreinforcement].

A certain rhythm in brain activity of the cat was reinforced with milk in one series of feedback experiments, and with KCl solution--in another series. The 1st series feedback augmented the rhythm, particularly in the 12--15 Hz range, in the sensory--motor area. Obvious minimization of the rhyth m occurred in the 2nd series within the range of 4--7 Hz only, and negative reinforcement of the 12--15 Hz rhythm in these series induced neurosis. The vegetative activity estimated by the cardio--interval dynamics, was regarded as the correlate of emotional tension induced by biologically significant effect.

Adaptation, Physiological↗
PubMedDate not supplied

EEG correlation and impulse activity of neuronal populations of individual structures of the cat brain during elaboration and reproduction of motor and alimentary reactions in instrumental conditioned reflexes.

Stable changes in EEG and spike activity of neuronal populations in different brain formations were studied on models of instrumental conditioned reflexes: motor and motor alimentary. A depencence has been established of the EEG amplitude-frequency parameters in the motor and striate cortical zones and the hippocampus on definite changes of unit spike activity in these areas. Simultaneous recording of the EEG and the spike activity of neuronal populations helps to elucidate the neurophysiological nature of individual rhythms of bio-electrical activity. Learned animals exhibit a stable reproduction of the spatial-temporal EEG patterns and motor alimentary reactions when automatic presentation of reinforcement is changed over to an arbitrary one.

Animals↗
PubMedDate not supplied

[Cumulated biological effects of microwaves and their reflection in behavior, work capacity, growth of body mass and state of brain neurons].

Albino rats were exposed to 2375 mHz microwaves of 500 microW/cm2 for 169 h. At the time of exposure, the body mass growth diminished, the efficiency and vertical motor activity decreased in exposed animals in comparison with the controls. Three types of radiation-induced damages were found in the brain: chromatolysis, pyknosis, and ischemia. Different brain parts displayed different sensitivity depending on their location in relation to transverse sutures of the skull.

Animals↗
PubMedDate not supplied

[Systemic effects of the interaction of an organism and microwaves].

A study was made of the dynamics of neurophysiological processes, the autonomic nervous system reactions, and the behaviour of cats during long-term electromagnetic field (EMF) exposure (500 mu W/cm2, 2375 MHz). Revealed were the synchronization of the brain bioelectrical activity at 6-10 Hz and 12-16 Hz, different EMF sensitivity of the brain structures, the heart rate decrease, and the increase in the mobility and aggression of the animals. A complex of interrelated changes occurring virtually in all functional systems of the organism should be considered as a specific EMF effect.

Animals↗