[Effect of hindbrain structures on autogenous periodic motor activity in the rat pup].

Experiments were performed in order to investigate whether the capacity of periodic motor excitation in rats during early postnatal life is the intrinsic feature of immature spinal cord or it is caused by supraspinal input. It was shown that after low spinal cord transection, birsts of periodic activity can still be obtained in m. gastrocnemius but their duration and amplitude are significantly reduced.

[Periodicity of corticospinal motor reactions of rat pups].

It has been demonstrated that at early stages of postnatal development of rats, corticospinal effects interact with spinal automatism. Epicortical stimulation at a frequency 0.5-1/s causes the onset of periodic motor activity during the first week of postnatal life; at later stages the same stimulation evokes periodically changing (with respect to their intensity) motor responses which follow the rhythm of stimulation.

[Effect of stimulation of the sensomotor cortex on the activity of the lumbar motor center in rats during ontogenesis].

In rats ageing up to 3 weeks, studies have been made on the reactions of the spinal motor center to long-lasting rhythmic stimulation of sensorimotor cortex. It was found that in 5-day old rats specific periodic pattern of the activity may be recorded similar to the autorhythmic spontaneous activity described in our earlier papers. In older animals periodic pattern of reaction can also be observed, but it may be modulated by stimulation.

[Results of a quantitative study of the interaction of pathogenic enterobacteria with a cell monolayer].

A study was made of the cytopathic effect and dynamics of intracellular reproduction of S. typhimurium and shigellae in the monolayer of HeLa cells, macrophages (monocytes) of the peritoneal exudate of rabbits and rats and microphages (granulocytes) of the pleural exudate of rabbits. The presence of bactericidal mechanism in the host cell to the invaded infectious agent is postulated.