Changes in the Structure of Amorphous Alloys under Deformation by High-Pressure Torsion and Multiple Rolling.

X-ray diffraction and scanning electron microscopy were used to study changes in the structure of amorphous alloys under deformation by high-pressure torsion and multiple rolling. The change in mean nearest neighbor distance (the radius of the first coordination sphere) under deformation was determined. During deformation, shear bands are formed in amorphous alloys, which are regions of lower density compared to the surrounding undeformed amorphous matrix.

[The characteristic of diarrheagenic Escherichia separated from children aged under 5 years old in Yaroslavl.].

The diarrheagenic bacteria coli take a significant place among agents of acute intestinal infections in children aged under 5 years. The main danger among these pathogens is represented by both enterotoxigenic E. coli causing enteritis and enterocolitis accompanied by acute dehydration diarrhea and Escherichia producing shiga-toxin being agents of hemorrhagic colitis and hemolytic uremic syndrome.

[The dynamics of the form of the extracellular potentials and of the process of depolarization wave spreading in the intramural layers of the myocardium in dogs with experimental ischemia].

The reversal of directions and local delays or accelerations of the extracellular potentials evolution occurred at arrival of the depolarization wave after coronary occlusion in dogs. General patterns of directions of the activation spread changed relatively little when compared to normal. Apparently, in spite of the ligation of the left anterior descending coronary artery, ischemia was not achieved.

[The process of heart ventricle depolarization and the formation of an electrocardiographic QRS complex in the frog].

Using intramural multipolar electrode technique, the pattern of propagation of the heart ventricle depolarization was studied in the frog Rana temporaria. The depolarization wave from the middle part of subendocardial layers was shown to spread to the apex and base of the heart and, simultaneously, to the epicardium. The ECG complexes are formed by the electrical activity of the endocardial, intramural and epicardial layers.

[Importance of T-lymphocytes in antibody production in experimental typhus infection].

The study of antibody production in cotton rats infected with Rickettsia prowazekii B and TB has revealed that R. prowazekii antigens, inducing the production of antibodies determined in the complement fixation, indirect hemolysis, and passive hemagglutination tests, are T-independent. The study of the nonspecific reactivity of T-lymphocytes in cotton rats infected with R.