Clinical and morphological features of salmonellosis in cows and calves affected by heat stress

Exposure to abnormally high temperatures in the Middle Urals has ledtochronic heat stress in cattle. Despitethe measures taken toprotect thedairy herdfrom overheating (fans, irrigationwith coolwater, livestocksunshades), the heatstressunderminedtheimmunityofanimals, thus, leadingtoan excessiverisein Salmonella population in the gastrointestinal tract, increasedin test in alpermeability, and could also bethecause of increasedvirulence of such serotypes as – Salmonella choleraesuis, that are not typical for cattle. The simultaneous presenceof twopathogensof Salmonella entericasubsp. entericaspecies: i.e. Salmonella enteritidis and Salmonella choleraesuis – causeda number of clinical and morphological changesin adultcows. In cows, the infection manifested itself by persistent diarrhea with mucus, reduced milkproduction and intoxication. In calves, the disease was accompanied by septic signs, severein toxication, hyperthermia (40.5–41.0 °C), severed ehydration (morethan 7%) and death. Histopathological examination of bovineparenchymal organs revealed changes typical for salmonellos is pathological process: specific salmonella granulomas were foundin parenchymalorgans (liver, spleen). Some pathological processestypical for sepsiswere foundin other parenchymalorgans (kidneys, heart). The nature of pathological changes in dicates that there is as epticprocess that spreads both hematogenically and lymphogenically, and the structure of granulomas most likely indicates that such apathogen as Salmonelacholeraesuis circulates in cattle

The cellular location of proteolytic enzymes of Bacillus intermedius

The activities of proteinases in the culture fluid and cellular fractions of Bacillus intermedius 3-19 grown under various conditions were studied. Thiol-dependent serine proteinase was the prevalent enzyme in the total pool of extracellular proteinases (70%); its catalytically active form was also detected in the cell membrane and, during active enzyme production, in the cell wall. Another enzyme, glutamyl endopeptidase (10% of the total pool), was detected in the cell membrane; it was also found in the cell wall and cytoplasm during active enzyme secretion into the growth medium. The production of these enzymes was maximal on medium containing inorganic phosphate and gelatin and decreased 2- to 4-fold on medium with glucose and lactate. The level of activity of extracellular enzymes correlated with that of corresponding membrane-bound proteins. The addition of CoCl2 (2 mM) into the medium caused an essential increase in extracellular glutamyl endopeptidase activity and promoted the release of the membrane-bound enzyme into the culture fluid. Proteolytic activity towards casein was also detected in the cytoplasm. The proteinases localized in the cytoplasm were shown to differ in their properties from those secreted. © 2000 MAIK "Nauka/Interperiodica"

Results of posterior lamellar femto-keratoplasty using two different lasers

Purpose. To evaluate the results of treatment of patients with pseudophakic bullous keratopathy (PBK) by the method of posterior lamellar femto-keratoplasty with ultrathin graft (FS-DSEK) harvested using two different lasers.Material and methods. The results of surgical treatment of 82 patients (82 eyes) underwent posterior lamellar femto-keratoplasty for PBK were analyzed. In the 1st group included 43 patients (43 eyes) with PBK underwent FS-DSEK using FS laser Femto-Visum (Optosystems, Russia). In the 2nd group included 39 patients (39 eyes) with PBK underwent FS-DSEK using LDV Z8 (Ziemer, Switzerland). Observation period was 1 year. Before and after surgery following indicators were evaluated: uncorrected visual acuity (UCVA), best spectacle corrected visual acuity (BSCVA), postoperative astigmatism, central corneal thickness (CCT), graft thickness, center-periphery (C:P) ratio, endothelial cell density (ECD), endothelial cell (EC) loss, optical density .Results. Transparent engraftment at 1-year observation period was observed in 88% of cases. In the 1st group UCVA=0.22±0.11, BSCVA=0.32±0.12, in the 2nd group UCVA=0.18±0.08, BSCVA=0.29±0.1 (p>0.05). The maximum BSCVA in both groups was 0.6. Postoperative astigmatism was comparative in 2nd groups – 1.43±1.1 and 1.38±1.0 D, respectively (p>0.05). In the 1st group, CCT=549±31, graft thickness in the central zone – 83±12, C:P ratio – 0.92±0.05; in the 2nd group CCT=546±28, graft thickness – 80±10, C:P ratio – 0.94±0.06 (p>0.05). In the 1st group ECD – 1326±282, EC loss – 55±6%; ECD in the 2nd – 850±230, EC loss – 70±7% (p<0.05). According to the results of densitometry, optical density of the posterior layers of the cornea and «donor–recipient» interface zone was higher in the 2nd group, both in the central and in the paracentral zones: in the 1st group in the posterior layers of the stroma – 16.4±1.2 (0–2 mm) and 15.8±1.0 (2–6 mm), in the interface zone – 14.5±0.9 (0–2) and 13.9±0.8 (2–6), in the 2nd group in the posterior layers – 18.3±1.3 (0–2 mm) and 17.9±1.1 (2–6 mm), and in the interface zone – 17.3±1.2 (0–2 mm) and 17.0±1.0 (2–6 mm, p<0.05).Conclusions. FS-DSEK showed high efficiency for treating patients with PBK. Functional results were comparative in 2nd groups. Statistical analysis showed highest safety of transplanted endothelium in the 1st group at 1-year observation period

SNP-Based Chromosomal Microarray Analysis for Detecting DNA Copy Number Variations in Fetuses with a Thickened Nuchal Fold

The aim of the study was to assess the diagnostic potential of SNP-based chromosomal microarray analysis for detecting pathogenic copies number variations (CNVs) in fetuses with a normal karyotype, in which an increase in the nuchal translucence of >2.5 mm was detected by ultrasound at a gestational age of 11 weeks to 13 weeks 6 days. MATERIALS AND METHODS: The study included 225 pregnant women who underwent invasive prenatal diagnostic procedures following the detection of an isolated thickening of the fetal nuchal fold. The fetal material obtained was examined using a cytogenetic test; if a normal karyotype was confirmed, chromosomal microarray analysis was performed as a second-line test. RESULTS: Pathogenic CNVs were detected in 22 of 225 fetuses (9.8%) with a normal karyotype. Of these 22 fetuses, pathogenic CNVs not classified as syndromes were detected in 14 cases (63.6%), and those previously described as syndromes — in 8 cases (36.4%). In 9 fetuses (41%), CNVs in two non-homologous chromosomes were determined; these findings indicated a high likelihood of carrying balanced translocations in the parents. Indeed, when analyzing the parent’s karyotype, in 8 out of 9 couples, balanced translocations were found in one of the parents. CONCLUSION: Using chromosomal microarray analysis in fetuses with a thickened nuchal fold makes it possible to increase the ability to detect chromosomal imbalances, including those caused by pathological meiotic segregation of parental reciprocal translocation

Проявления туберкулезной инфекции у детей при положительной пробе с аллергеном туберкулезным рекомбинантным

The objective: to study manifestations of tuberculous infection in children with a positive result of the test with TRA and determine the tactics for their follow-up.Subjects and methods. In 217 children with a positive result of the test with tuberculosis recombinant allergen (TRA) followed up in a TB dispensary, the results of clinical and radiological (multispiral computed tomography MSCT) examinations were studied and the response to the test with TRA during monitoring (within 3 years) was evaluated to justify terms of dispensary follow-up.Results. It was found that the test with TRA and MSCT allows diagnosing both latent tuberculous infection and detecting minimal post-tuberculous changes (calcifications). Monitoring was performed in 2 groups: Group 1 (n = 112) included patients with newly detected calcifications in the lungs and chest lymph nodes, Group 2 (n = 105) consisted of patients without detected changes in the lungs and chest lymph nodes. The frequency of hyperergic reactions to the test with TRA recorded in patients of both groups was the same (46.7 ± 4.4 and 48.2 ± 4.7%). Results of the test with TRA in children without radiological changes stabilized two years, and in case of calcifications - in three years of follow-up, which allowed predicting the terms of follow-up for such children as belonging to tuberculosis risk group.Цель: изучить проявления туберкулезной инфекции у детей при положительной пробе с АТР и определить тактику их наблюдения.Материалы и методы. У 217 детей при положительной пробе с аллергеном туберкулезным рекомбинантным (АТР), наблюдавшихся в противотуберкулезном диспансере, изучены результаты клинико-рентгенологического (мультиспиральная компьютерная томография ‒ МСКТ) обследования и оценены реакции пробы с АТР при мониторинге (в течение 3 лет) для обоснования сроков диспансерного наблюдения.Результаты. Установлено, что использование пробы с АТР и МСКТ позволяет диагностировать как латентную туберкулезную инфекцию, так и выявить минимальные посттуберкулезные изменения (кальцинаты). Мониторинг проводился в 2 группах наблюдения: 1-я (n = 112) ‒ с впервые выявленными кальцинатами в легких и внутригрудных лимфатических узлах (ВГЛУ), 2-я (n = 105) ‒ без установленных изменений в легких и ВГЛУ. Гиперергические реакции на пробу с АТР с одинаковой частотой регистрировались у пациентов обеих групп (46,7 ± 4,4 и 48,2 ± 4,7%). Стабилизация результатов пробы с АТР у детей без визуализируемых рентгенологически изменений наблюдается уже через два года, а при наличии кальцинатов ‒ к трем годам наблюдения, что позволяет прогнозировать сроки наблюдения таких детей в диспансерной группе риска по туберкулезу

Эпидемиологические аспекты туберкулеза у детей и подростков 0-17 лет в период улучшения общей ситуации по туберкулезу

Between 2008 and 2018, the overall tuberculosis incidence in Novosibirsk Region went down with the moderate annual decrease of 3.9% on average. By the end of 2018, the number of new tuberculosis cases decreased, while the incidence of multiple drug resistant tuberculosis increased. Tuberculosis situation in children from 0 to 17 years old was characterized by stabilization of incidence. In adolescents, these rates moderately decreased (-2.9%), and in children under 14 years old, this rate demonstrated the annual growth of 4.8%. In the context of the large burden of tuberculosis infection (2008), in 61.3% of tuberculosis cases in children aged 0-17 years, the index case of tuberculosis infection (ITBI) was not identified; by 2018, this rate dropped to 30.3%. However, the family exposure to a tuberculosis case was rather a predictor of the disease in children versus adolescents. And among adolescents, the role of casual contacts with ITBI was high (60.6%). Regardless of the epidemic situation, most of the children from 0 to 17 years old who developed tuberculosis were not covered by tuberculosis control activities, one of the reasons was the late detection of the source of tuberculosis infection.В 2008-2018 гг. общая заболеваемость туберкулезом в Новосибирской области характеризовалась ежегодным умеренным снижением в среднем на 3,9%. К концу 2018 г. отмечены уменьшение числа впервые зарегистрированных больных туберкулезом, рост частоты туберкулеза с множественной лекарственной устойчивостью. Эпидемическая ситуация у детей от 0 до 17 лет характеризовалась стабилизацией показателей заболеваемости. У подростков – умеренным снижением их значений (-2,9%), а у детей до 14 лет ‒ ежегодным ростом показателя на 4,8%. В условиях большого «резервуара» туберкулезной инфекции (2008 г.) у 61,3% заболевших туберкулезом детей 0-17 лет источник туберкулезной инфекции (ИТБИ) не определен, к 2018 г. этот показатель снизился до 30,3%. При этом семейный контакт с больным туберкулезом чаще являлся предиктором заболевания у детей, чем у подростков. А у подростков была высока роль случайных контактов в обществе с ИТБИ (60,6%). Независимо от эпидемической ситуации, большая часть заболевших туберкулезом детей 0-17 лет не была охвачена противотуберкулезными мероприятиями, одна из причин ‒ позднее установление источника туберкулезной инфекции

The Orbital Order Parameter in La0.95Sr0.05MnO3 probed by Electron Spin Resonance

The temperature dependence of the electron-spin resonance linewidth in La0.95Sr0.05MnO3 has been determined and analyzed in the paramagnetic regime across the orbital ordering transition. From the temperature dependence and the anisotropy of linewidth and $g$-value the orbital order can be unambiguously determined via the mixing angle of the wave functions of the $e_{\rm g}$-doublet. The linewidth shows a similar evolution with temperature as resonant x-ray scattering results

Influence of human peripheral blood samples preprocessing on the quality of Hi-C libraries

The genome-wide variant of the chromatin conformation capture technique (Hi-C) is a powerful tool for revealing patterns of genome spatial organization, as well as for understanding the effects of their disturbance on disease development. In addition, Hi-C can be used to detect chromosomal rearrangements, including balanced translocations and inversions. The use of the Hi-C method for the detection of chromosomal rearrangements is becoming more widespread. Modern high-throughput methods of genome analysis can effectively reveal point mutations and unbalanced chromosomal rearrangements. However, their sensitivity for determining translocations and inversions remains rather low. The storage of whole blood samples can affect the amount and integrity of genomic DNA, and it can distort the results of subsequent analyses if the storage was not under proper conditions. The Hi-C method is extremely demanding on the input material. The necessary condition for successfully applying Hi-C and obtaining high-quality data is the preservation of the spatial chromatin organization within the nucleus. The purpose of this study was to determine the optimal storage conditions of blood samples for subsequent Hi-C analysis. We selected 10 different conditions for blood storage and sample processing. For each condition, we prepared and sequenced Hi-C libraries. The quality of the obtained data was compared. As a result of the work, we formulated the requirements for the storage and processing of samples to obtain high-quality Hi-C data. We have established the minimum volume of blood sufficient for conducting Hi-C analysis. In addition, we have identified the most suitable methods for isolation of peripheral blood mononuclear cells and their long-term storage. The main requirement we have formulated is not to freeze whole blood

Differential effects of nitrate, ammonium, and urea as N sources for microbial communities in the North Pacific Ocean

Nitrogen (N) is the major limiting nutrient for phytoplankton growth and productivity in large parts of the world's oceans. Differential preferences for specific N substrates may be important in controlling phytoplankton community composition. To date, there is limited information on how specific N substrates influence the composition of naturally occurring microbial communities. We investigated the effect of nitrate ( math formula), ammonium ( math formula), and urea on microbial and phytoplankton community composition (cell abundances and 16S rRNA gene profiling) and functioning (photosynthetic activity, carbon fixation rates) in the oligotrophic waters of the North Pacific Ocean. All N substrates tested significantly stimulated phytoplankton growth and productivity. Urea resulted in the greatest (>300%) increases in chlorophyll a (<0.06 μg L−1 and ∼0.19 μg L−1 in the control and urea addition, respectively) and productivity (<0.4 μmol C L−1 d−1 and ∼1.4 μmol C L−1 d−1 in the control and urea addition, respectively) at two experimental stations, largely due to increased abundances of Prochlorococcus (Cyanobacteria). Two abundant clades of Prochlorococcus, High Light I and II, demonstrated similar responses to urea, suggesting this substrate is likely an important N source for natural Prochlorococcus populations. In contrast, the heterotrophic community composition changed most in response to math formula. Finally, the time and magnitude of response to N amendments varied with geographic location, likely due to differences in microbial community composition and their nutrient status. Our results provide support for the hypothesis that changes in N supply would likely favor specific populations of phytoplankton in different oceanic regions and thus, affect both biogeochemical cycles and ecological processes

Туберкулез у детей и подростков последнего десятилетия

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