[Comparative characteristics of 2 morphometric methods of assessing the degree of liver fatty distrophy]. / Sravnitel'naia kharakteristika dvukh morfometricheskikh metodov otsenki stepeni zhirovoi distrofii pecheni.

The fat content in the liver of white male Wistar rats was measured over time (1, 2, 4, 8 and 14 days) after a single exposure to CCl4 within a wide concentration range (from 30 to 25700 mg/m3) by the two morphometric techniques: subjective-graduation and semi-automatic evaluation of the volumetric fat fraction, using a TAS unit (Leitz-Wetzlar). The results obtained with both the methods indicate that the CCl4 concentration equal to 260 mg/m3 is the threshold one as shown by the morphological signs of liver fatty dystrophy. The semi-automatic method offered enables an objective evaluation of the findings, making the research time shorter. To obtain adequate results with the method, it is necessary to observe the rules of the morphological material treatment (contrast selective color, uniform and sufficient thickness of the sections).

[Quantitative characteristics of ultrastructural changes in axo-dendritic synapses under the influence of tetanus toxin]. / Kolichestvennaia kharakteristika ul'trastrukturnykh izmenenii akso-dendriticheskikh sinapsov pod vliianiem stolbniachnogo toksina.

Changes in synaptic ultrastructure of the external geniculate body (EGB) were investigated in rats when a generator of pathologically intensified excitation (GPIE) was produced in this nucleus under the influence of tetanus toxin (TT). At the period of pronounced convulsive activity (24 h after TT injection), synaptic changes were estimated electronmicroscopically and with quantitative comparison of the materials from three groups. The first group included EGB synapses where TT was injected, the second group included contralateral EGB synapses and the third included EGB from the rats injected with inactivated toxin. By means of electron optic computer "Klassimat" average amount of round, flat, anomalous and adjacent to the presynaptic membrane vesicles was measured, average relative length of the active zone, average area of the presynaptic terminal, average relative section areas of pre- and postsynaptic cytoplasm condensation were estimated. In the area of GPIE formation, under the influence of TT, the increased amount of the vesicles related to the presynaptic membrane and that of flat vesicles were statistically significant. At the same time, the synaptic terminals, by the number of vesicles, have bimodal, while the control groups have unimodal distribution.