Rheological Characteristics of Loam Compositions with Mineral Additives of Different Genesis and Morfology

Structural clay products manufacturing is depends on the potential of local raw materials. Shoddy silty loams are the main component of molding mixtures in view of shortage of the quality clays. Therefore, methods for determining the structural characteristics of molding compounds are becoming important. The objective of study is the influence of mineral additives different genesis and morphology at structural characteristics and molding properties of the compounds based on shoddy silty loams. Photometrical sedimentometer FSH-6K and optical microscopy method were used for the determining of granulometric compositions and morphological properties of the additives. Conical rheometer method was used for the determining plastic strength of the moulding compounds. Shear plastometer method was used to determining values of the low elastic, high elastic and plastic deformations. It had defined the optimal values of molding clay compound’s moisture in which molding compositions had being tested. Optimal values of the molding composition’s moisture in which molding compounds has not subjected to negative influences of the gravitational water are equal to 15-19%. Structural constants were calculated for molding compositions based on different kinds of additives. Values of the percent of low elastic, high elastic and plastic deformation were calculated on the grounds of rheological curves. Optimal values of composition’s structural characteristics were accepted from the condition of three types of deformations

EPR of Pb3+ ion in LiBaF3 crystals

Complex EPR spectra of paramagnetic centers Pb3+ formed in LiBaF3:Pb2+ crystals under X-ray irradiation are studied in the temperature range of 10-150 K. It is shown that lead ions substitute Ba2+ ions in the LiBaF3 crystal and are in the cubic-octahedral 12-fold environment of the fluorine ions. The hyperfine structure constants describing the observed spectrum are determined and parameters of superhyperfine interaction with the nearest fluorine ions are estimated. © Springer-Verlag 2006

Isolated lesions of the sphenoid sinus: features of diagnosis and treatment

Aim – to analyze the cases of isolated lesions of the sphenoid sinuses and to identify the main errors in the differential diagnosis in the prehospital and treatment periods. Material and methods. The study includes the data on the treatment of 58 patients with an isolated lesion of the sphenoid sinus in the period 2015–2018. The patients' age varied from 18 to 68 years. Gender distribution: men – 21 (30.7%), women – 37 (69.3%). Results. The following surgical approaches were used: transnasal access, extended transnasal access, transetmoid access, access according to the Bolger Box technique. In one case, the transpterygoid approach was used. When performing extended access, it was possible to achieve the formation of persistent, epithelized anastomosis in all the cases. In polypous-purulent forms of sphenoiditis, the relapses of the disease were most often observed, however, only anti-inflammatory therapy was required, including a sinus irrigation through the formed anastomosis. Conclusion. Further studies are required, to examine the features/safety and clinical efficacy of the various endosurgical approaches

Efficacy of Angio-Seal Device for Primary And Complicated Haemostasis: a Multicentre Retrospective Assay

Background. Femoral approach in endovascular surgery remains relevant being, however, associated with the risk of fatal and non­fatal complications. Modern techniques for instrumental haemostasis achieved with the Angio­Seal device (Terumo Corporation, Japan) provide an opportunity to reduce the number of fatal and non­fatal complications. Aim. A multicentre assay of the efficacy and safety of instrumental puncture closure using Angio­Seal devices (Terumo Corporation, Japan) in various settings and clinical situations.Materials and methods. A multicentre retrospective analysis of 1088 use cases of the Angio­Seal device  (Terumo Corporation, Japan) for “primary” and “complicated” instrumental haemostasis after femoral access  has been conducted for the years 2018–2020. The mean patient age was 62.3 ± 11.6 years, including 845 men (78.0%) and 243 women (22.0%). Five centres for routine and emergency endovascular radiology participated in the study.Results. The Angio­Seal device (Terumo Corporation, Japan) demonstrated a high method efficiency, with a  97.0% success rate of “primary” instrumental haemostasis (1055 of 1088 total successful haemostatic  procedures) in various clinical settings. Arterial thrombosis at the approach side had a 3.0% complication rate  (5 of 33 observations), all other complication types associated with haemorrhagic events (8 cases) or device malfunction and damage (20 cases).Discussion. The assay conducted suggests that the incidence of “complicated” instrumental haemostasis  relates to technical drawbacks of the device application that required advance planning. The key identified  prerequisites for a successful Angio­Seal application (Terumo Corporation, Japan) are the alignment of anchor tube­delivery through soft tissue into the vessel lumen and its positioning inside the vessel.Conclusion. The constructive features and instrumental haemostatic technique realised in the Angio­Seal  device (Terumo Corporation, Japan) enable an effective and safe primary sealing of arterial puncture site in 97% cases

Detection and identification of nitrogen centers in nanodiamond: EPR studies

Electron paramagnetic resonance (EPR) and electron spin echo (ESE) at X-band and at high-frequency W-band (95 GHz) have been used to study natural diamond nanocrystals, detonation nanodiamond (ND) with a size of ∼ 4.5 nm and detonation ND after high-temperature, high-pressure sintering with a size of ∼ 8.5 nm. Isolated nitrogen centers N 0 and nitrogen pairs N2+ have been detected and identified, and their structure has been unambiguously determined by means of the high frequency EPR and ESE in natural diamond nanocrystals. In detonation ND and detonation ND after sintering, isolated nitrogen centers N 0 have been discovered in nanodiamond core. In addition EPR signals of multivacancy centers with spin 3/2 seem to be observed in nanodiamond core of detonation ND. Copyright © Taylor & Francis Group, LLC

Detection and identification of nitrogen defects in nanodiamond as studied by EPR

Electron paramagnetic resonance (EPR) and electron spin echo (ESE) at X-band and at high-frequency W-band (95 GHz) have been used to study defects in natural diamond nanocrystals, detonation nanodiamond (ND) with a size of ∼4.5 nm and detonation ND after high-temperature, high-pressure sintering with a size of ∼8.5 nm. Atomic nitrogen centers N0 and nitrogen pairs N2 + have been detected and identified and their structure has been unambiguously determined by means of the high frequency EPR and ESE in natural diamond nanocrystals. In detonation ND and detonation ND after sintering atomic nitrogen centers N0 have been discovered in nanodiamond core. In addition EPR signal of multi-vacancy centers with spin 3/2 seems to be observed in diamond core of detonation ND. © 2009 Elsevier B.V. All rights reserved

Nitrogen centers in nanodiamonds: EPR studies

Electron paramagnetic resonance (EPR) and electron spin echo (ESE) at X-band (9.4 GHz) and W-band (94 GHz) have been used to study defects in natural diamond nanocrystals, detonation nanodiamond (ND) with a size of ∼ 4.5 nm and detonation ND after high-pressure hightemperature (HTHP) sintering with a size of ∼ 8.5 nm. Based on identification of atomic nitrogen centers N0 and nitrogen pairs N2 + detected by means of the high frequency EPR and ESE in natural diamond nanocrystals, atomic nitrogen centers N0 have been discovered in nanodiamond core in detonation ND and detonation ND after sintering. In addition EPR signal of multi-vacancy centers with spin 3/2 seems to be observed in diamond core of detonation ND. © (2010) Trans Tech Publications

Влияние препарата «Граноцит» на мезенхимальные стволовые клетки костного мозга при моделировании вторичного иммунодефицита с помощью циклофосфана в эксперименте

Experiments with 60 male and female mice of Balb/c line with mass of 18—21 g have been carried out. All manipulations, including ether euthanasia, were performed within the framework of approved rules for experiments with experimental animals. The mice were divided into four groups each of 15 animals. The groups were injected with physiological salt solution (first group), cycliphosphan (second group), Granotsit preparation (recombinant granulocytic colony-stimulating factor) (third group), and cycliphosphan in Granotsit preparation (fourth group). We have studied the total number of leucocytes in blood, bone marrow cellularity, content of granulocytic- macrophage colony-forming cells and mesenchyma l precursors with the aid of tissue culture in vitro. It has been found that the Granotsit preparation can stimulate myelopoiesis (direct specific action) and mesenchymopo iesis (indirect action) in norm. When a cytostatic agent, the studied cytokine has a protective action on both myeloid and mesenchyma l precursors of bone marrow.Проведены опыты на 60 мышах линии Balb/c обоего пола массой 18-21 г. Все манипуляции, эвтаназия (эфиром) осуществлялись в рамках утвержденных правил проведения работ с использованием экспериментальных животных. Мышей распределили на четыре группы по 15 животных. В первой серии осуществляли введение физиологического раствора, во второй - циклофосфана, в третьей - препарата «Граноцит» (рекомбинантный гранулоцитарный колониестимулирующий фактор), в четвертой - циклофосфана и препарата «Граноцит». Исследовали общее количество лейкоцитов в крови, клеточность костного мозга, содержания гранулоцитарно-макрофагальных колониеобразующих клеток и мезенхимальных прекурсоров с помощью культуры ткани in vitro. Установлено, что препарат «Граноцит» обладает способностью стимулировать миелопоэз (прямое специфическое действие) и мезенхимопоэз (непрямое, опосредованное действие) в норме. При введении цитостатика исследуемый цитокин оказывает протекторное действие по отношению как к миелоидным, так и мезенхимальным прекурсорам костного мозга