Estimate of rock mass stability in surface-borehole mining of high-grade iron ore

Under consideration is the estimate of rock mass stability around underground openings generated as a result of hydraulic borehole mining of iron ore. The authors use analytical solutions of two plane elasticity problems on stress state of infinite media with the zone of weakening in the form of one or two circular holes, given initial stresses are set in the study domain

INFLUENCE OF PATIENTS’ PREHOSPITAL ATTENDANCE AT OUTPATIENT CLINICS ON LONG-TERM OUTCOMES OF ACUTE CORONARY SYNDROME: LIS-3 STUDY

Aim. To assess influence of patients’ prehospital attendance at outpatient clinics on long-term outcomes of acute coronary syndrome (ACS).Material and methods. Patients (n=397) hospitalized with ACS (01.11.2013-31.07.2015) were included. 19.4% of patients died in hospital (77/397).-According to their rate of attendance at outpatient clinics all survived patients (n=320) were divided into 3 groups: committed to visiting outpatient-clinics (n=139), partially committed (n=103) and not committed (n=78). Follow-up period was 14-35 months (88.44% follow-up rate). During-follow-up period 12.5% of patients died (40/320). All-cause mortality and recurrent cardiovascular diseases (nonfatal myocardial infarction and stroke,-unstable angina) were defined as the primary endpoint. Prognostic significance of separate factors and their combinations were assessed by their influence on the primary endpoint.Results. Clinical severity of course of the disease was assessed regarding all factors that had influence on the primary endpoint. By their degree of influence on the primary endpoint each factor was given a certain score. According to the sum of all scores patients were divided into 2 groups: patients with less (n=205) and more (n=78) severe clinical course of the disease. Risk of development of primary endpoint was higher in patients with more severe clinical course of the disease (relative risk 3.997; 95% confidence interval 2.199-7.267; p <0.0001) regardless of patients’ attendance at outpatient-clinics (p>0.05).Conclusion. Patients’ prehospital attendance at outpatient clinics did not affect long-term outcomes of acute coronary syndrome. Patients with more-severe clinical course of the disease were more likely to develop adverse outcomes during the follow-up regardless of their prehospital attendance at outpatient clinics

IMPACT OF ATRIAL FIBRILLATION ON THE NEAR AND LONG-TERM PROGNOSIS OF LIFE AFTER ACUTE MYOCARDIAL INFARCTION. THE DATA OF THE LIS-1 STUDY (LYUBERTSY MORTALITY STUDY OF PATIENTS WITH ACUTE MYOCARDIAL INFARCTION)

Aim. To study the effect of atrial fibrillation (AF) that existed before the myocardial infarction (MI), on near and long-term mortality in patients with acute MI.Material and methods. The data of LIS register (Lyubertsy study on mortality rate in patients after MI), that included all patients hospitalized for acute MI (n=1133) during the period from 1 January 2005 to 31 December 2007, were used to solve the aim of the study.Results. AF was recorded in 88 patients (7.8%), and the frequency of AF significantly increased with age. 22 patients with a history of AF (25%) died in hospital, and mortality in this group of patients was significantly higher than this in the whole group of patients (15.2%; p=0.025). However, these differences were not statistically significant when adjusted for age and gender (OR=1.25; 95% CI 0.77-2.04; p=0.37). 66 people from 961 patients, who were discharged from the hospital, had the AF before acute MI. Relative risk of death in patients with AF in this group (adjusted for age and sex) was significantly higher than this in patients without AF (OR=1.91; 95% CI 1.18-3.11; p=0.005). Conclusion. AF diagnosed in patients with acute MI at admission did not influence significantly hospital mortality. However, pre-existing AF increases significantly the risk of death in patients survived acute period of MI

TWO-PHASE DYNAMICS OF BONE MARROW MULTIPOTENT MESENCHYMAL STROMAL CELLS (MMSC) ACTION ON LIVER AT MODELING OF FIBROTIC HEPATITIS

Under the modeling of chronic fibrousing hepatitis in rats (n = 75) the dynamics of fibrolytic effect of bone mar- row MMSC was examined after one or two-time infusion of these cells at the early stage of liver fibrosis. By dynamic measuring of liver fibrotic area and the expression of activated stellate cell markers (desmin, α-SMA) and markers of cell apoptosis (caspase-3 and caspase-9) within 90 days two phases of the development of bone marrow MMSC fibrolytic effect were found. It is shown that the development of fibrolytic effect includes the primary phase of intensification of fibrosis, which is followed by the phase of enhanced fibrolytic process in the liver. It was determined that the two-phase dynamics of liver regeneration was more intensive after two-time infusion of bone marrow MMSC

ОПТИМИЗАЦИЯ СОСТАВА КРЕМНИСТОЙ ЛАТУНИ ЛЦ16К4 С ЦЕЛЬЮ ПОВЫШЕНИЯ ЕЕ ЖИДКОТЕКУЧЕСТИ ПРИ ПОЛУЧЕНИИ ХУДОЖЕСТВЕННОГО ЛИТЬЯ

LC16K4 silicon brass is widely used in ornamental casting because of its good processing characteristics, beautiful golden color and the possibility to apply various decorative coatings. The paper studies the possibility to increase fluidity of LC16K4 silicon brass by varying its chemical composition according to GOST 17711-93. A vacuum suction method used for fluidity measurement revealed that this parameter changes when adding 0,1 wt.% of the alloying element (Zn, Si, Al) and that measurements show high repeatability. The experimental data were subjected to regression analysis. The effect of zinc and silicon on the silicon brass fluidity was quantitatively assessed, and an adequate mathematical model was built with a response surface of the fluidity function. The optimum melt overheating temperature was found that ensures the highest alloy fluidity with a minimum zinc loss. The results of this study may be useful in ornamental and industrial casting of LC16K4 silicon brass, as well as in other metallurgy and foundry areas. Кремнистая латунь марки ЛЦ16К4 нашла широкое применение в художественном литье за счет высоких технологических свойств, красивого золотого цвета и возможности нанесения различных декоративных покрытий. В работе проведено исследование возможности увеличения ее жидкотекучести путем варьирования химического состава в рамках ГОСТ 17711-93. Для измерения жидкотекучести был использован метод вакуумного всасывания, который выявил изменения этого показателя при добавлении от 0,1 мас.% легирующего элемента (Zn, Si, Al), а также показал высокую сходимость результатов. Экспериментальные данные подвергались регрессионному анализу. Была получена количественная оценка степени влияния цинка и кремния на жидкотекучесть кремнистой латуни, построена адекватная математическая модель и поверхность отклика функции жидкотекучести. Определена оптимальная температура перегрева, обеспечивающая максимальное значение жидкотекучести сплава при минимальном угаре цинка. Результаты данной работы могут быть применимы при получении художественного и промышленного литья из кремнистой латуни ЛЦ16К4, а также в других областях металлургии и литейного производства.

Corrigendum: Twenty-year clinical progression of dysferlinopathy in patients from Dagestan [Front Neurol, 8, (2017) (77)] doi: 10.3389/fneur.2017.00077

The "Funding" section should be: This work was funded by Human Stem Cells Institute PJSC and Roman V. Deev. Theoretical part of this work was supported by Russian Scientific Foundation grant (14-15-00916). Ivan A. Yakovlev and Mikhail O. Mavlikeev were supported by the Russian Government Program of Competitive Growth of Kazan Federal University. The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way

Twenty-year clinical progression of dysferlinopathy in patients from Dagestan

© 2017 Umakhanova, Bardakov, Mavlikeev, Chernova, Magomedova, Akhmedova, Yakovlev, Dalgatov, Fedotov, Isaev and Deev.To date, over 30 genes with mutations causing limb-girdle muscle dystrophy have been described. Dysferlinopathies are a form of limb-girdle muscle dystrophy type 2B with an incidence ranging from 1:1,300 to 1:200,000 in different populations. In 1996, Dr. S. N. Illarioshkin described a family from the Botlikhsky district of Dagestan, where limb-girdle muscle dystrophy type 2B and Miyoshi myopathy were diagnosed in 12 members from three generations of a large Avar family. In 2000, a previously undescribed mutation in the DYSF gene (c.TG573/574AT; p. Val67Asp) was detected in the affected members of this family. Twenty years later, in this work, we re-examine five known and seven newly affected family members previously diagnosed with dysferlinopathy. We observed disease progression in family members who were previously diagnosed and noted obvious clinical polymorphism of the disease. A typical clinical case is provided

THE ASSOCIATION OF DEPRESSION WITH C-REACTIVE PROTEIN (THE DATA OF ESSE-RF EPIDEMIOLOGICAL STUDY)

Aim. To study the association of depression with a high-sensitivity C-reactive protein (hsCRP) level, taking into account the main risk factors and noncommunicable diseases in Russia residents.Material and methods. The data of ESSE-RF multicenter study (a representative sample of the unorganized male and female population aged 25-64 years from 8 regions surveyed in 2012-2014) were used in the work. A total 11884 people were involved into the study including 35.9% men. The examination included a survey on the standard questionnaire containing data on disease history, etc. The level of depression was assessed by the validated in Russian Hospital Anxiety and Depression Scale (HADS, 1983). hsCRP level was determined in all patients.Results. The continuing association between elevated levels of depression (HADS-D ≥8+) and high level of hsCRP ≥3.0 mg/l (odds ratio [OR] 1.15; 95% confidence interval [CI] 1.03-1.27; p=0.009) was found in the multivariate model, after adjustment for sex, age, education, and risk factors. Reducing of the relationship of elevated levels of depression with a high level of hsCRP (OR 1.11; 95% CI 1.00-1.24; p=0.048) was found with the additional introduction of diseases in the model. This relationship was reduced to not statistically significant level (OR 1.08; 95% CI 0.98-1.20; p=0.134) in the full model adjusted for regions.Conclusion. The reduced association of depression with hsCRP ajusted for aggregate risk factors was found in the study. This suggests about multifactor affecting on this relationship