[The organization of instrumental food-procuring movements in rats].

The roles of the lateral hypothalamus, basolateral nucleus of the amygdalar complex, the second field of the frontal cortex, and ventromedial thalamic nucleus in organization of the fast ballistic food-procuring movements were studied in albino rats. Sequences of uni- and bilateral destruction of the brain structures were assessed by photorecording. Movement-related neuronal activity in these structures was recorded in freely moving animals.

[The role of the basolateral nuclei of the rat amygdala in organizing rapid food-acquisition movements].

The influence of electrolytic destruction of the basolateral nucleus of amygdala (BLA) on rapid food-getting movements was studied in albino rats. After one side destruction of the BLA, contralateral to the working forelimb it was found that the number of movements and their frequency decreased with an increase of their duration. After two side destruction of the BLA the number of movements increased with a decrease of their frequency.

[Role of the ventromedial nucleus of the rats thalamus in food-procuring movements].

The characteristics of ballistic food-procuring movements were studied in albino rats. After electrolytic destruction of ventromedial nucleus of thalamus (VM) of contralaterally preferred extremity the number of attempts and frequency of movements were determined to increase with a decrease of their duration. The restoration of parametres of movements took place during a week.

[Role of the frontal cortex in the organization of rapid ballistic movements of rats].

Rapid ballistic food-getting movement characteristics were studied in albino rats. After ablation of the second area of the frontal cortex contralaterally as to the preferred extremity the number of attempts increased and their duration with reorganization of the phase structure of movements decreased. The habit of food extraction was lost after bilateral ablation of the cortex.

[Laterality of food handling movements in rats].

Lateralization of motor food skills has been investigated on 77 adult white rats. The predominance for the left anterior extremity while carrying out food was found in 53.5% of rats, the right extremity--in 36.

[Comparative physiologic study of the responses of cerebellar cortex neurons to stimulation of the vagus nerve].

The cerebellar cortex neuronal responses (of Purkinje cells--PC, and of unidentified neurons UN) to vagus stimulation in anesthetized pigeons, rats and monkeys were actualized as spikes or as complex discharges in PC. Tonic neuronal responses were mainly excitatory. All the PC and the majority of UN were polymodal.

[Effect of the mineral-ammonia preparations MP-15 and MP-7 on nitrogen metabolism in cows].

It has been studied how MP-15 and MP-7 preparations fed on to lactating cows affect the indices of acid-base equilibrium of their blood, nitrogen metabolism, milk yield and milk quality. It is shown that feeding on MP-15 and MP-7 preparations to cows of test groups has no negative effect on the acid-base equilibrium indices, decreases the ammonia concentration by 38.5 and 54.

[Metabolism of cGMP with K+ concentration increase in the medium causing depolarization of cortical cell membranes in normal and irradiated rats].

An increase in the K+ concentration in the medium to 60 mM which causes depolarization of cell membranes in the rat cerebral cortex is studied for its effect on the cGMP level, guanylate cyclase and cGMP phosphodiesterase activities in norm and one hour after X-ray irradiation. The cGMP content and guanylate cyclase activity in normal rats and 1 min after depolarization are shown to increase with the external K+ concentration. One hour after irradiation the activity of enzymes under examination is three times as high.

[Effect of carbostimulin on the concentration of tricarboxylic cycle metabolites, oxidative processes and antibody biosynthesis in the rat].

Carbostimulin is studied for the effect it exerts on indices of the acid-base equilibrium of blood, content of certain tricarboxylic-cycle metabolites and free amino acids and formation of antibodies in rats. It is established that carbostimulin feeding increases the total carbon dioxide, pyruvate and lactate concentration in blood, the content of ammonium, glutamine and certain free amino acids being decreased. Oxidation processes in the liver mitochondria and biosynthesis of antibodies in experimental animals are shown to be more intensive than in the control ones.

[Interaction of automatic centers].

Evoked responses in the cerebellar cortex during stimulation of posterior hypothalamus in anesthetized cats revealed activating as well as inhibitory influences on the cerebellar cortex. The mamillary med. nucleus seems to have monosynaptic as well as polysynaptic connections.

[Electrical responses of the red nucleus to acoustic stimulation].

Letency of evoked potentials (EPs) recorded in the anesthetized cat's magnocellular part of red nucleus varied from 3.5 to 4.5 msec on binuaural and contralateral stimulations.

[Responses of cat cerebellar cortex neurons to stimulation of the caudate nucleus, globus pallidus and substantia nigra].

Impulsive responses (IR) of the Purkinje cells (PC) and other units of the cerebellar cortex in the paramedian lobules, lobulus simplex and tuber vermis were evoked by stimulation of nucleus caudatus (NC) in cats under chloraloze-nembutal narcosis. The phasic IR as simple discharges (due to mossy fibre activation) were exhibited mainly with a latency of 5-12 and 14-20 ms; a latency of the compound responses ) due to climbing fibre PC activation) was equal to 5-6, 9-22 ms and more. There were differences in rhythmic reproduction of the responses depending on their latency.

[Influence of destruction of the lateral reticular nucleus and nuclei of the inferior olive in cats on electrical responses of the cerebellar cortex evoked by stimulation of the vagus nerve].

The role of the lateral reticular nucleus and inferior olive in production of the cerebellar cortex evoked potentials to stimulation of n. vagus was studied on 28 cats under chloralose-nembutal narcosis. After electrolytical destruction of the lateral reticular nucleus prolongation of the latency and a decrease in the evoked potential amplitude were observed, especially ipsilaterally.