[Hypothalamic regulation of retinal function].

Unlabelled: Studying compensatory capacity of the brain is a pressing issue. To resolve it, diversified experiments should be conducted providing an idea of the underlying mechanisms and possibilities of functional restoration.

Aim: To determine the effect of unilateral electrocoagulation of supraoptic (SO) and suprachiasmatic (SCH) hypothalamic nuclei on the appearance of the electroretinogram (ERG).

[Visual cortex and its participation in retinal function regulation].

The study of visual cortex local changes caused by strychnine and potassium chloride revealed significant changes (relief or depression) not of evoked potentials in the cortex only, but of unidirectional changes of the total electroretinogram (ERG) amplitude and its components as well (early receptor and oscillator retinal potentials). Cortex excitability decrease or increase resulted in inhibition or facilitation of early receptor potential development respectively due to weakening or strengthening of the inhibitory neurotransmitter GABA effect in photoreceptor synapses. Changes of ERG components and retinal oscillator potential corresponded to the changes of visual evoked potentials that reflected upon cortex inhibition or facilitation.

[Evaluation of endoscopic changes in pationts with sarcoidosis of respiratory organs].

The aim of the study was to reveal endoscopic changes of a bronchial tree in patients with sarcoidosis of respiratory organs with apply endobronchial microsurgical biopsy interventions. Under our supervision there were 57 patients with various forms intrathoracic sarcoidosis. The character of endobronchial displays of disease and changes of mucous bronchial tubes are depicted.

[Study of visual perception under conditions of extreme light exposures].

Neurophysiological processes of transduction and analysis of information concerning brightness of photostimuli and peculiarities of functioning of visual system under exposure to extra-bright light effects or extreme contrasting of visual objects are studied poorly and present significant interest for unraveling actual mechanisms of visual perception under extreme conditions. Conducting analysis of visual system in maximal broad range both in terms of adequate perception and reflection of light stimulus intensity and adaptive mechanisms to extra-strong illumination regimes is as well very important. The to-date obtained data indicate that under the extreme light effects pathology of the peripheral portion of visual analysator can be induced.

[Epidemiologic peculiarities of infections caused by the hepatitis B and C viruses among lung tuberculosis patients].

The article presents the results of serological investigation for presence of specific markers of hepatitis B (HBV) and hepatitis C (HCV) infections in serum samples obtained from 600 patients with acute and chronic forms of lung tuberculosis (LT) and in control group I - 600 healthy adults and in control group II - 796 patients with somatic pathology from multiprofile hospital. It has been established that among LT patients frequency of revealing HBsAg and anti-HCV is statistically steady; similar indicators are among persons from both control groups. The frequency of revealing of these markers among patients with chronic forms of LT is considerably higher than frequency of their revealing in patients with acute forms of LT.