[Hydrodynamics of disk artificial heart valves with different design characteristics].

Bench tests for 38 models of artificial heart valves (AHV) with different design parameters allowed us to decide in favour of the valves with reduced eccentricity (compared to the serial AHV of the EMAHV type) according to its resistance in the constant flow. Out of the compatibility checks of the design parameters tested it was concluded that the disk did not make the complete calculated angle when rotated. The dependence of AHV resistance on the disk rotation angle showed that there is no necessity to increase that angle more than 70 degrees for the mitral valve and more than 75 degrees for the aortic AHV.

[Clinical characteristics of the Soviet low-profile heart valve prostheses EMIKS and LIKS].

The present work is devoted to the clinical assessment of the Soviet-made cardiac valve prostheses 'EMIKS' and 'LIKS'. From 1983 to May 1, 1988, 632 prostheses were implanted to 508 patients. A group of 348 patients were assessed: 139 after mitral (M) replacement, 130 after aortal (A) replacement, and 79 after mitral-aortal (M+A) replacement.

[A method of determining the kinematic parameters of artificial/disk heart valves].

The described method makes it possible to determine the kinematic parameters of the artificial cardial disk valves in treadmill tests. This method is more convenient and accurate than those proposed earlier. The article presents design formulae and graphs for determining the above parameters.

[Analysis of the causes of potential wear and breakdown of elements of artificial heart valves of the disk type].

The reliability analysis of the artificial cardiac valve and experiments made it possible to establish that the ACV reliability is ensured by the physical and mechanical properties of the material, technology observance and thorough control over each operation during the manufacturing process. The accelerated testing of the new MX disk valve made in the USSR showed a satisfactory degree of the disk wear and the absence of breaks-down after 400 million working cycles which is equivalent to ten-years' work in a human body.

[Study of chicken and mouse interferons by the isoelectric focusing method].

Results of investigation of the chicken and mouse interferons by electrofocussing in sucrose and in polyacrylamide gel are described. The isoelectric points of these interferons were determined. The advantages of the electrofocussing in gel over that in sucrose for the interferon analysis was shown.

[Biochemical and physiocochemical characteristics of a type C virus isolated from spontaneous lymphosarcoma of CC57Br strain mice].

The properties of murine oncornavirus produced by cells of spontaneous lymphosarcroma of CC57Br mice are described. In addition to the properties common for C-type RNA tumor viruses such as 60-70 S high molecular weight RNA, the presence of RNA-directed DNA polymerase and murine gs I (intraspecies) antigen and typical morphology in electron microscope, etc., the virus under study is characterized by instability of virions, unusual features of the DNA polymerase system and by the absence of demonstrable oncogenicity either in laboratory animals or in tissue cultures.