The microstructure of binary Al
100−
x
–Mg
x
(
x
= 10, 15, 18 and 25 wt%) alloys after long anneals (600–4000 h) was studied between 210 and 440 °C. The transition from incomplete to complete ...wetting of Al/Al grain boundaries (GBs) by the second solid phase Al
3
Mg
2
has been observed. The portion of completely wetted GBs increases with increasing temperature beginning from
T
wsmin
= 220 °C. Above
T
wsmax
= 410 °C all Al/Al GBs are completely wetted by the Al
3
Mg
2
phase.
Background
. Reconstructive surgery for iatrogenic injuries of the bile ducts involves the formation of a biliodigestive anastomosis. The development of anastomotic stricture is the most severe ...complication of this operation.
Aim of the study
. To evaluate the immediate and long-term results of treatment and follow-up of patients with iatrogenic injuries of the bile ducts who underwent reconstructive surgery on the bile ducts with additional creation of gastroenteroanastomosis.
Material and methods
. The study included 26 patients operated on according to the original method in the period 2010-2018.
Results
. In the study group, complications in the early postoperative period developed in 3 (11.5%) patients. Endoscopic interventions using the formed gastroenteroanastomosis in the long-term period were performed in 7 patients. The results of treatment were followed in 25 (96%) patients. The median follow-up period was 90 months 81.5;110 (42-129).
Conclusion
. The use of the proposed original technique of reconstructive surgery has demonstrated its effectiveness and safety, with the possibility of dynamic endoscopic control and, if necessary, the treatment of postoperative complications such as cholelithiasis and biliodigestive anastomosis strictures.
Objectives
. To synthesize phosphorus-containing oligoestermethacrylates spatially separated by spacers of aliphatic or aromatic structure and evaluate their effect on photocuring kinetics.
Methods
. ...For determining the qualitative and quantitative composition of the synthesized compounds, the following methods were used: thin layer chromatography; chromatographic and mass spectrometry; infrared spectroscopy; 1H, 13C, 31P nuclear magnetic resonance spectroscopy; differential scanning calorimetry. The dielectric loss tangent was determined on a specially designed optical cell with an ultraviolet (UV) light source to an immittance meter. Elemental analysis was performed on an energy dispersive X-ray fluorescence spectrometer.
Results
. Spatially separated oligoestermethacrylates based on phosphorus trichloride containing aliphatic or aromatic spacers in the structure were synthesized. During the interaction of glycidyl methacrylate with phosphorus trichloride in the mass of the latter, reaction products were shown to be formed both according to the Krasusky rule from the side of the α-carbon atom, as well as against this rule with the formation of isomeric products. Obtaining these compounds in bulk is possible only in the presence of a homopolymerization inhibitor. The influence of the spacer structure on the curing rate of oligoestermethacrylates under the action of UV radiation has been established. It has been shown that the introduction of a spacer into the oligomer structure is accompanied by an increase in the induction period by a factor of 39 compared to a sample without a spacer.
Conclusions
. The results obtained indicate the possibility of obtaining new oligoestermethacrylates with aliphatic and aromatic spacers in the structure. The influence of the structure of the spacer on the kinetics of photocuring is determined.
Photopolymerization of compositions based on poly(vinyl butyral) solutions in a mixture of di-(1-methacryloxy-3-chloropropoxy-2-)methylphosphonate (FOM-II) and 2-hydroxypropylmethacrylate (HPMA) ...monomers is studied. The effectiveness of these compositions as photocurable adhesives for fireproof glass assemblies is evaluated. It is shown that the developed photopolymerizable adhesives can be recommended for fabrication of fireproof glass assemblies for building purposes due to their translucence, high adhesion to silicate glass (up to 30.5 MPa), and accordance with the EIW15 protection class according to the results of firing tests.
Thermochemically initiated radical copolymerization of a mixture of di(1-methacryloxy-3-chloropropoxy-2-)methylphosphonate (FOM-II) and 2-hydroxypropyl methacrylate in the bulk in the presence of ...1–10 wt % dissolved polyvinyl butyral was studied. The process is characterized by two and more self-acceleration periods. This is associated with specific features of FOM-II polymerization transformations and with the presence of polyvinyl butyral macromolecules capable of association with methacrylic monomer molecules in the polymerizing system.
Recent statistics have shown increased rates of morbidity and mortality from Clostridium difficile infection worldwide. This problem is mainly typical for surgical patients and is associated with an ...antibiotic therapy and a prolonged hospital stay. Recipients of solid organs are at a high risk of developing severe forms of C. difficile infection due to immunosupression. Existing recommendations for the treatment of C. difficile infection are based on the severity of the disease and do not consider patients after liver transplantation. The aim of this work is to determine an actual tactics for the diagnosis and treatment of C. difficile in organ recipients in clinical practice.
This paper contains discussion of application of methods of assessment of vascular stiffness in clinical practice, comparison of such parameters as pulse wave velocity, ankle-brachial and ...cardio-ankle vascular index (CAVI), as well as analysis of advantages of cardio-ankle CAVI for diagnosis, evaluation of effectiveness of treatment, and prognosis in various cardiovascular diseases.
Ischemic heart disease and acute myocardial infarction (AMI) in particular remain widely spread and contribute seriously in total mortality of population. This literature review is devoted to the ...right ventricular (RV) AMI as the least studied problem of contemporary cardiology. We present here description of specific characteristics of blood supply to ventricles of the heart, clinical picture, diagnostic criteria and prognosis of RV infarction. We also present current strategy of management of patients with RV AMI including early revascularization with the help of percutaneous coronary intervention.
Primary and secondary prevention of cardiovascular complications (CVC) has been one of the key areas in modern cardiology over the past decades. The article examined the relationship between the risk ...of CVC and the lipid metabolism parameters. The article discussed the major clinical trials the results of which constitute the evidence base for statins use to reduce the risk of acute coronary and cerebrovascular events.
to analyze correspondence between determination of vascular age of patients with cardiovascular diseases by volumetric sphygmography and their chronological age, and to assess the influence of lipid ...factors and atherosclerotic lesions in carotid arteries (CA) on parameters associated with the cardio-ankle vascular index (CAVI).
Clinical, laboratory and instrumental examination which included volumetric sphygmography was carried out in 185 patients with various cardiovascular diseases. Calculated vascular age was determined on the basis of graphic conversion of ratio of CAVI and true age of a patient.
Calculated vascular age exceeded chronological age in 43 patients (23.4%). Analysis of the data obtained in this subgroup, except natural interrelation between such characteristics as age, ankle-brachial index, CAVI and calculated vascular age revealed statistically significant correlations (p < 0.05) between following parameters: R-CAVI and male gender (r = 0.35), calculated vascular age (based on R-CAVI) and TG (r = -0,34), L-CAVI and BMI (r = -0.36), R-ABI and the presence of atherosclerotic plaques in carotid arteries (r = -9.34). Comparison of influence of lipid factors and CA atherosclerotic lesions on CAVI associated parameters revealed no significant differences between groups.
Volumetric sphygmography with calculation of vascular age is an easily reproducible and accessible method of screening of early changes in the vascular wall. Determination of vascular age of patients with cardiovascular diseases by volumetric sphygmography suggests advisability of thorough medical examination at least in a quarter of total number of patients.
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