Immunocytochemistry and transmission electron microscopy were employed to examine the ultrastructural morphometric parameters of the left ventricular cardiomyocytes and right atrial secretory myocytes in rats during early and delayed postreperfusion periods. The revealed alterations in these cells are stereotypical, but differed by their severity, probably due to specific morphofunctional peculiarities of these heart structures.
The aim of the study was to compare two types of conduits made of either non-resorbable Reperen or resorbable Tissucol for their effects on the regeneration of the rat sciatic nerve under conditions of stump diastasis. Materials and Methods. The experiments were carried out using outbred white male rats of the reproductive age (n=14). The animals were divided into three groups: group 1, intact (n=5), used for studying the morphology of the sciatic nerve; group 2 (n=4) — nerve plastic surgery was performed using a conduit made of non-resorbable Reperen; group 3 (n=5) — surgery was performed using a conduit made of resorbable Tissucol. The animals were anesthetized with isoflurane. After a complete transection of the sciatic nerve in the middle third of the thigh, its stumps were inserted into a conduit of an internal diameter of 2 mm and a length of 10 mm, filled with saline. Diastasis of 5 mm in length was created by spreading the nerve ends and securing the epineurium to the tube edges with 8/0 polypropylene sutures. A total count of myelinated nerve fibers was performed in the area of repair (tubulation) and the distal part of the nerve; the formation of connective tissue sheaths was assessed 14 weeks after the operation. Results. According to the morphological assessment, both types of conduits (resorbable and non-resorbable) caused the similar number of fibers to restore in the distal part of the repaired nerve; clinical characteristics of the animals in both groups were close to each other and to the norm. Conclusion. The results allow us to consider the conduit made of non-resorbable Reperen as a device promising for neuroplasty along with the resorbable conduit made of Tissucol.
In the post-Soviet period, attention is paid to the depopulation problem in the Baltic States, caused by the natural decline and migration outflow. At the same time, there is a change in the amount of certain ethnic groups in the population of these states. The purpose of the study is to assess the prospects for the reproductive potential of ethnic groups in Estonia, Latvia, and Lithuania. The study was carried out within ethnic demography, a scientific discipline that has developed at the intersection of demography, ethnography, and anthropology. The article presents the results of forecasting the number of major ethnic groups in the Baltic States for the long term (until 2061) using original methodological tools. In all three Baltic states, against the background of population decline, the share of titular ethnic groups is expected to grow – the highest in Latvia, the less significant in Estonia, and the minimum in Lithuania. The share of Russians (the most significant is in Latvia) and other ethnic groups will continue to decrease due to their low reproductive potential. In general, the tendency of the Baltic countries to move away from the complex ethnic structure of the population in the Soviet period towards mono-ethnicity will continue.
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