[Endoscopic diagnosis of tuberculosis and other granulomatous diseases of respiratory organs: advances and prospects].

The paper presents data on the use of various bioptic methods in phthisiatry and pulmonology. Particular attention is given to granulomatous diseases of the lung whose misdiagnosis may be during clinical examinations in 50-70% of cases. Making the methods of transbronchial biopsies, including those of the lung and bronchoalveolar lavage, better, putting them into practice widely, and developing new studies (microbiological, electron microscopic, immunological, morphological) for biopsy specimens may improve the diagnosis of lung diseases.

[Analysis of hippocampal RNA in rats with genetically determined differences in their ability to learn].

Selection for twelve generations, by the speed of elaboration of a food-procuring motor conditioned reflex, produced an increased intensity of the synthesis of n and c fractions of the hippocampal RNA in rapidly learning animals as compared with those slowly learning. Electrophoretic analysis of the two fractions revealed similar series of RNA classes in the initial and the learning animals' groups. With high molecular RNA classes, insertion of the radioactive precursor was higher in the rapidly learning animals than in the slow learning ones.

[The intensity of RNA synthesis in rat hippocampus during learning].

Intensity of hippocampal RNA synthesis was studied in albino rats on days when elementary links of the chain motor conditioned reflex with food reinforcement were formed. A gradual increase in the nuclear RNA synthesis intensity was found in both learned and unlearned rats from the 1st towards the 5th day. This increase was, however, higher in the learned rats.

[Biochemical-genetic mechanisms of learning. II. Selection for high and low rates of acquiring a motor conditioned reflex].

Using the model of feeding motor conditioned reflex, polymorphism for the rate of the formation of this response was found in a population of laboratory animals. Selection for high and low rate of the formation of this reflex resulted in significant differences in this character between two strains already in the second generation. These differences are maintained in subsequent generations.

[Biochemical-genetic mechanisms of learning. II. Selection for a higher and lower rate of motor conditioned reflex acquisition].

Using the model of feeding motor conditioned reflex, polymorphism for the rate of the formation of this response was found in a population of laboratory animals. Selection for high and low rate of the formation of this reflex resulted in significant differences in this character between two strains already in the second generation. These differences are maintained in subsequent generations.

[The biochemical-genetic mechanisms of learning. II. Selection for high and low rate of acquiring a motor conditioned reflex].

Using the model of feeding motor conditioned reflex, polymorphism for the rate of the formation of this response was found in a population of laboratory animals. Selection for high and low rate of the formation of this reflex resulted in significant differences inthis character between two strains already in the second generation. These differences are maintained in subsequent generations.