Influence of high-intensity CO2 laser irradiation on collagen matrix composition of normotrophic skin scars (experimental study)

The experiment was carried out in 25 laboratory rats. After modeling of normotrophic cutaneous scars, the procedure of laser dermabrasion with 50 Watt carbon dioxide laser was performed in superpulse mode with impulse-pause ratio of 0,5:100 ms and 500 µm spot diameter. Morphological, immunohistochemical and morphometric examination of skin histological sections were performed. A single exposure to CO2 laser radiation in this mode resulted in the early formation of mainly type III collagen and then type I collagen in ratios approaching to the intact skin.Проведено экспериментальное исследование на 25-ти лабораторных крысах, которым после моделирования нормотрофических кожных рубцов выполняли процедуру лазерной дермабразии излучением углекислого лазера мощностью 50 Вт в суперимпульсном режиме с соотношением импульс – пауза 0,5:100 мс и диаметром пятна 0,5 мм. Проводили морфологическое, иммуногистохимическое морфометрическое исследование гистологических срезов кожи. Установлено, что однократное воздействие излучением Со2 лазера в указанных режимах приводит к образованию в ранние сроки преимущественно коллагена III типа, а затем и коллагена I типа в соотношениях, приближающихся к показателям интактной кожи

Correlation between actual nutrition and lipid peroxidation and antioxidant defense parameters in aged 14–17 years adolescents living in rural area

The aim of the study was to reveal the relationship between the parameters of actual nutrition and the lipid peroxidation and antioxidant defense system in adolescents aged 14–17 in a rural area. Material and methods. 76 adolescents aged 14–17 of the Irkutsk region were examined by the cross-sectional study method. Actual nutrition was studied by the 24-hour nutrition reproduction method. The content of substrates with unsaturated double bonds (DB), diene conjugates (DC), ketodienes and conjugated trienes (KD and CT), thiobarbituric acid reacting species (TBARS), α-tocopherol, retinol, reduced (GSH) and oxidized glutathione (GSSG), total blood antioxidant activity (TAA), superoxide dismutase (SOD) activity in blood by spectrophotometry and fluorometry methods were analyzed. Results. The adolescents’ diet did not meet the principles of a balanced diet – there was reduced protein intake, an imbalance of unsaturated fatty acids, A, C, D, B vitamins deficiency. An excessive element in the diet was sodium. The content of substrates with DB, KD and CT and TBARS increased significantly in the studied group of adolescents, the concentration of DC decreased. Parameters of antioxidant defense both decreased (TAA, retinol content) and increased (α-tocopherol, GSH concentration). Correlation analysis showed relationships between DB and vitamin B1, B2 content; DC level and calories, carbohydrate and vitamin B1 content; concentration of KD and CT and fats, TAA and vitamin A and β-carotene level; level of α-tocopherol in blood and vitamin E in food; GSH and vitamin K; SOD activity and vitamin H content. Multiple negative correlations were between GSSG and fat, vitamins B1, B9, C, K food concentration were found.Conclusions. The calculated vitamin consumption indicators allow to reveal nutritional deviations in adolescents and to connect them with the real provision of the body with these metabolites

Clinical and epidemiological characteristics and effectiveness of antiviral therapy for COVID-19 in children: The experience of the first year of the pandemic

Background. The use of antiviral agents can shorten the duration of the viral infection. The aim: to study the clinical and epidemiological features and the effectiveness of antiviral therapy for new coronavirus infection (COVID-19) in outpatient children.Materials and methods. From April 2020 to March 2021, 9334 outpatient children aged from 0 months to 17 years were randomly tested for new coronavirus infection. SARS-CoV-2 RNA was detected in oropharyngeal and nasal material by PCR. Patients with confirmed new coronavirus infection were prescribed interferon-alpha (IFN-α) intranasally, antiviral agents of systemic action. The control group consisted of children with COVID-19 who did not receive treatment.Results. When examining clinically healthy contact children, SARS-CoV-2 RNA was detected in 7.4 % of cases. In the structure of ARI, the specific weight of COVID-19 was 12.3 % with the peak incidence in April-May (up to 22.8 %) and NovemberDecember (up to 30.0 %). In half of the cases, children became infected in the family, and usually adults were the index patient. In 47.7 % of cases, an asymptomatic form of COVID-19 was registered without significant differences in patients of different ages. In one third of children with concomitant pathology, the disease was asymptomatic, in half it was mild, in other cases moderate severity was diagnosed. The clinical picture of COVID-19 did not differ from other ARIs. Anosmia (9.4 %) in half of the cases was combined with ageusia (4.4 %) and was significantly more common in boys. The duration of clinical manifestations in children of the control group and those who received antiviral therapy did not statistically significantly differ in mild and severity of the disease. Also, various antiviral therapy options did not significantly affect the duration of SARS-CoV-2 detection in children with various forms of COVID-19.Conclusion. In the first year of the pandemic, the novel coronavirus infection did not dominate the pattern of respiratory diseases in outpatient children. Further research is required to develop pediatric guidelines for the treatment of COVID-19 at the outpatient stage

Anthropourgic Foci of Plague in Vietnam: Past and Present

The review contains the results of ecological-epizootiological and epidemiological investigations of plague in the territory of the Socialist Republic of Vietnam in 1989-2012. Studied has been the structure of epizootic triad - carrier-vector-pathogen. There is a low probability of plague foci occurrence in zones of tropical forests and savanna under the conditions of humid subequatorial climate. Main plague agent carrier on the Thai Nguyen Plateau is the synanthropic little rat, Rattus exulans . Specialized fleas species are absent on wild-living rats Rattus genus, as well as mice, and bandicoots, and the abundance of other species is small. It has been demonstrated that all the elements of the parasitic plague system are classified as introduced species. Thereupon it is inferred that plague foci in Vietnam are anthropourgic and are of anthropogenic origin solely. Plague cases in humans across the territory of the country were registered between 1898 and 2002. The most persistent ones functioned on the Thai Nguyen Plateau. Although epizootic activity of the foci in territory of the former endemic provinces has decreased, it is necessary to continue epizootiological monitoring further on in the modern period

Ингибирование процесса кристаллизации карбонатов кальция и магния полиакрилатом натрия

It is known that when water are used for technological purposes, in circulating water supply systems of enterprises as a coolant during continuous heating and cooling, the formation of insoluble precipitates, most often calcium carbonates, occurs on the walls of heat exchangers, which leads to a large number of problems, even production can be stopped for cleaning equipment. To prevent the formation of salts, it is necessary to use precipitation inhibitors. Sodium polyacrylate was investigated as a precipitation inhibitor. The composition, morphology and IR spectra of calcium carbonate precipitate obtained in the absence and in the presence of sodium polyacrylate were studied. It was established that the effect of sodium polyacrylate on the mechanism of crystallization of carbonate sediment depends on the pH of the initial solution. The results of IR spectroscopy, X-ray diffraction analysis and images obtained by electron microscopy indicate the participation of polymer molecules in the formation of the crystalline structure of the carbonate precipitate.Известно, что при использовании воды в технологических целях, в частности, в системах оборотного водоснабжения предприятий в качестве охлаждающей жидкости в процессе постоянного нагревания и охлаждения происходит образование нерастворимых осадков, чаще всего карбонатов кальция, на стенках теплообменников, что приводит к большому количеству проблем, вплоть до остановок производства для очистки оборудования. Для предотвращения образования отложений необходимо применять ингибиторы осадкообразования. В работе в качестве ингибитора осадкообразования исследовали полиакрилат натрия. Изучен состав, морфология, ИК-спектры осадка карбоната кальция, полученного в отсутствие и в присутствии полиакрилата натрия. Установлено, что влияние полиакрилата натрия на механизм кристаллизации карбонатного осадка зависит от рН исходного раствора. Результаты ИК-спектроскопии, РФА и снимки, полученные электронной микроскопией, свидетельствуют об участии молекул полимера в формировании кристаллической структуры карбонатного осадка

Thyroid cancer risk in Belarus among children and adolescents exposed to radioiodine after the Chornobyl accident

BACKGROUND: Previous studies showed an increased risk of thyroid cancer among children and adolescents exposed to radioactive iodines released after the Chornobyl (Chernobyl) accident, but the effects of screening, iodine deficiency, age at exposure and other factors on the dose-response are poorly understood. METHODS: We screened 11 970 individuals in Belarus aged 18 years or younger at the time of the accident who had estimated (131)I thyroid doses based on individual thyroid activity measurements and dosimetric data from questionnaires. The excess odds ratio per gray (EOR/Gy) was modelled using linear and linear-exponential functions. RESULTS: For thyroid doses \u3c5 \u3eGy, the dose-response was linear (n=85; EOR/Gy=2.15, 95% confidence interval: 0.81-5.47), but at higher doses the excess risk fell. The EOR/Gy was significantly increased among those with prior or screening-detected diffuse goiter, and larger for men than women, and for persons exposed before age 5 than those exposed between 5 and 18 years, although not statistically significant. A somewhat higher EOR/Gy was estimated for validated pre-screening cases. CONCLUSION: 10-15 years after the Chornobyl accident, thyroid cancer risk was significantly increased among individuals exposed to fallout as children or adolescents, but the risk appeared to be lower than in other Chornobyl studies and studies of childhood external irradiation

Myocardial infarction in the population of some Russian regions and its prognostic value

Aim. To study the prevalence of myocardial infarction (MI) in the population of Russian regions and its contribution to cardiovascular events.Material and methods. The analysis material was representative samples of the population aged 35-64 years from 11 Russian regions,  examined within the multicenter study “Epidemiology of Cardiovascular Diseases and their Risk Factors in Regions  of Russian Federation”. The response rate was about 80%. The study used a community-based  systematic stratified multiply random sample. During the study, information on prior MI was obtained using a standard questionnaire. Anthropometry and measurement of blood pressure (BP) and heart rate (HR) with an automatic BP monitor were performed. Resting electrocardiography (ECG) was performed, followed by Minnesota coding. Major and minor QQS waves and STT segments were considered as ischemic  ECG abnormalities. Biochemical parameters were determined using an Arkhitect 000 Clinical Chemistry Analyzer. The median prospective  follow-up was 6,21 [5,25; 6,75] years. A composite endpoint (CE) was analyzed, including cardiovascular death and non-fatal MI. During the follow-up period, 363 all-cause deaths were detected,  of which 134 were from cardiovascular diseases, while 196 — CEs. Statistical analysis was carried out in R 3.6.1 environment.Results. The MI prevalence among the Russian population was 2,9%; 5,2% for men and 1,5% for women,  increasing  with age. Men with prior MI were  more likely to take statins and beta-blockers  than women as follows: 39,0% vs 25,6% and 29,3% vs 27,1%, respectively. MI newly diagnosed within the follow-up  period was associated with the following risk factors (RFs): smoking, increased BP, HR, triglycerides and glucose.  For individuals with prior MI, a significant relationship was found only with smoking.  Multiple comparison  of the contribution of RFs, ECG abnormalities,  and prior MI showed  that the inclusion of ischemic ECG abnormalities in the analysis significantly increases  the risk of cardiovascular events in individuals without prior MI compared with individuals without both MI and ECG changes.  A high CE risk was noted in patients with prior MI: relative risk (RR), 4,73 (2,92-7,65); the addition of ischemic ECG abnormalities increased the RR to 5,75 (3,76-8,8).Conclusion. The RR of CEs in patients  with prior MI without or with ischemic ECG changes  is 4,73 and 5,75 times higher than in patients without MI and ECG abnormalities. The risk factors  identified  in this case cannot explain such an increase  in CEs. It is obvious  that people  with prior MI need  rehabilitation. The presence of RFs in patients with newly diagnosed  MI indicates insufficient primary prevention, which suggests  that strengthening preventive measures to eliminate conventional risk factors in patients with newly diagnosed  MI will help reduce the risk of recurrent MI or cardiovascular  mortality

Major Factors Affecting Incidence of Childhood Thyroid Cancer in Belarus after the Chernobyl Accident: Do Nitrates in Drinking Water Play a Role?

One of the major health consequences of the Chernobyl Nuclear Power Plant accident in 1986 was a dramatic increase in incidence of thyroid cancer among those who were aged less than 18 years at the time of the accident. This increase has been directly linked in several analytic epidemiological studies to iodine-131 (131I) thyroid doses received from the accident. However, there remains limited understanding of factors that modify the 131Irelated risk. Focusing on post-Chernobyl pediatric thyroid cancer in Belarus, we reviewed evidence of the effects of radiation, thyroid screening, and iodine deficiency on regional differences in incidence rates of thyroid cancer. We also reviewed current evidence on content of nitrate in groundwater and thyroid cancer risk drawing attention to high levels of nitrates in open well water in several contaminated regions of Belarus, i.e. Gomel and Brest, related to the usage of nitrogen fertilizers. In this hypothesis generating study, based on ecological data and biological plausibility, we suggest that nitrate pollution may modify the radiationrelated risk of thyroid cancer contributing to regional differences in rates of pediatric thyroid cancer in Belarus. Analytic epidemiological studies designed to evaluate joint effect of nitrate content in groundwater and radiation present a promising avenue of research and may provide useful insights into etiology of thyroid cancer

Assessment of genetic and mineralogical - technological peculiarities of titanium magnetite ores of the Pudozhgorsky ore deposit with use of mathematical apparatus

In article described results of studying of the Pudozhgorsky titanomagnetite's ores by methods of mathstatistics