Structural changes in hepatic vessels were studied in pups with experimental aortic coarctation and animals with corrected defect. Reconstruction of vessels was assayed by functional, morphometric, and histological methods. Aortic coarctation in pups was followed by a decrease in circumferential strain of the wall of hepatic arteries. These changes were accompanied by atrophy and sclerosis of the media. The arterial bed had a greater number of vessels with intimal muscles. Muscle bundles in large hepatic veins underwent dystrophy. After correction of experimental defect, the increase in circumferential strain of arteries was accompanied by hypertrophy of the wall. The number of arterial vessels with intimal muscles decreased, while muscle bundles in hepatic veins were thickened. Sclerosis of hepatic vessels was reversible.
Brain and kidneys from 15 control and 70 experimental puppies with hemodynamic model of coarctation of the aorta were examined. The number of regulatory muscle formations was increased in the brain and decreased in the kidneys during modeling of aorta coarctation associated with hyper- and hypotension in the corresponding basins. The location of these structures in cerebral and renal distribution and resistance vessels is analyzed.
Purpose: to characterize oceanographic conditions and their variability at various time scales within the walleye pollock area, including all Far Eastern seas of Russia, the Chukchi Sea, and the South Kuril and East Kamchatka regions.Methods: analysis of literary sources and data of expedition studies conducted by the Far Eastern branches of «VNIRO».Novelty: for the first time, a generalization of current information on the oceanological conditions of walleye pollock habitat in the main areas of its reproduction, feeding and fishing was given.Results: In the Bering Sea, three periods were identified during 1950–2020: cold period (1950–1976), moderate period (1977–2013) and warm period (2014–2020). Strong year-classes of walleye pollock were formed only over the moderate period. During the modern warming of the Bering Sea migrations of walleye pollock from the US EEZ into Russian waters occurs by one month earlier that favors the pollock fishery in the Navarin area and Gulf of Anadyr. The warming of Okhotsk Sea waters, combined with the tendency to reduction of its ice cover, favor expansion of the walleye pollock feeding area northward and westward. The warming of the Sea of Japan results in a depressive trend for all Japan Sea walleye pollock populations. At the same time, against the background of depression in modern (abnormally warm) conditions, the formation of single strong year-classes of any Japan Sea walleye pollock population is still possible.Practical significance: the results of this work can be used to improve the methods of the medium-r ange and long-range forecasts of walleye pollock catch.
The article celebrates the 115th anniversary of the Irkutsk heavy engineering plant (IHEP) and describes its operation experience. During this time, IHEP worked its way up from a workshop supplying the army, an agricultural and mechanical plant to one of the largest Russian machine-building plants with a full production cycle in the Commonwealth of Independent States. The scientific base developed at the enterprise makes it possible to automate the same type tasks, as well as to upgrade equipment in order to improve its technological performance. The article analyzes the operation results of the enterprise. A consideration is given to the line of manufactured equipment, its improvement and modernization methods. A distinctive feature of IHEP is the availability of foundry facilities, which carry out melting, molding and heat treatment of products. A key element contributing to the development of the enterprise is the design office, which is constantly in search of new solutions that best meet the needs of customers in terms of industrial and economic efficiency, safety, reliability and service life of the designed equipment. The IHEP Design Bureau uses modern tools for equipment design and flow processes modeling for subsequent calculation of the technical and design parameters of thickening equipment, which ensures high performance, as well as safe and efficient operation. Today, the enterprise has launched a serial production of mining and processing equipment, as well as mine machinery and metallurgical equipment. IHEP equipment is supplied to more than 20 countries around the world. The plant's customers are the largest companies of the Russian Federation, which operate in the field of mining, metallurgy and oil production.
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