Advanced Analysis of Clay Microporosity Using High-Resolution N-Ar Adsorption Isotherms Coupled with the Derivative Isotherm Summation Method.

The textural properties of synthetic and natural clays in the sodium form and exchanged with tetramethylammonium cations (TMA) were characterized using N and Ar physisorption isotherms at cryogenic temperatures. Specific surface areas and micro/mesoporous volumes were determined using the BET and the models. The analysis requires the use of reference isotherms measured at the same temperature on the surface of non-porous materials with an identical chemical composition.

[Modern approaches in endovascular and endoscopic treatment of isolated splenic injury].

Objective: To analyze treatment outcomes in patients with traumatic spleen injury and improve their management through introduction of modern approaches.

Material And Methods: We retrospectively analyzed treatment outcomes in 126 patients with spleen injury who underwent surgery between 2018 and 2023. Analysis was performed using Excel and Statistica software, as well as Spearman correlation and χ tests.

Poland's syndrome and breast cancer: coincidence or not?

Poland's syndrome is an uncommon congenital anomaly of unknown etiology, the main characteristic of which is the absence of the major pectoral muscle. Thorax and upper limb malformations also may be present. Poland's syndrome has been observed in clinical cases connected to a variety of neoplasia, primarily hematological disorders.

[Endovascular technologies in the treatment of patients with blunt abdominal trauma].

Trauma is one of the leading causes of disability and mortality in working-age population. Abdominal injuries comprise 20-30% of traumas. Uncontrolled bleeding is the main cause of death in 30-40% of patients.

Integral scales in assessing the risk of postoperative morbidity and mortality.

Annual number of surgeries exceeds 10 million In Russia, and this number is increasing every year. Searching for a scale or index determining the risk of postoperative complications and mortality is an important issue all over the world. The authors analyzed all available risk assessment scales for postoperative morbidity and mortality.

On the use of O NMR for understanding molecular and silica-grafted tungsten oxo siloxide complexes.

O-labelled tungsten siloxide complexes [WOCl(OSiBu)] (1-Cl) and [WOMe(OSiBu)] (1-Me) were prepared and characterized by O MAS NMR, with input from theoretical calculations of NMR parameters. Guidelines linking O NMR parameters and the coordination sphere of molecular and silica-grafted tungsten oxo species are proposed. The grafting of 1-Me on SiO afforded material 2, with surface species [(SiO)WOMe(OSiBu)] as shown by elemental analysis, IR and H and C MAS NMR.

Giant inflammatory pseudotumor of the lung: a case report.

The inflammatory myofibroblastic tumor, which was first described in 1939, is a rare neoplasm that accounts for 0.04%-0.7% of all lung neoplasms.

[EVOLUTION OF APPROACHES IN THE TREATMENT OF CLOSED INJURY OF THE LIVER AND SPLEEN].

The article analyzes the main aspects of the development of various approaches and methods in the provision of medical care to patients with closed abdominal trauma with damage to the liver and spleen. The most important stages of improving approaches, the impact of scientific and technological progress on the introduction of modern technologies in this area of surgery are described. The modern views of various authors on the existing problem are considered.

A rare case of primary adrenal lymphoma.

Adrenal gland incidentaloma (incidental - sudden, accidental) is a mass of the adrenal gland(s), accidentally detected by an instru-mental examination conducted for other reasons. The frequency of detection of this pathology based on computer tomography of the abdominal organs is 0.5%-2%.

[Preoperative biliary drainage for malignant biliary obstruction: to drain or not to drain? And if drain, in what way?].

On the basis of the conducted literary search, a number of conclusions can be drawn. When performing preoperative biliary drainage (PBD), it is necessary to have a clear understanding: why is this procedure performed (severe liver failure, cholangitis, long preoperative preparation is required due to comorbid status, neoadjuvant chemotherapy is necessary, etc.)? Routine use of PBD is impractical.

[Anaplastic thyroid carcinoma: a case report].

Anaplastic thyroid carcinoma is a high-grade aggressive tumor with a tendency for early metastasis. The paper describes a rare case of Stage IVB anaplastic thyroid carcinoma, including its clinical, instrumental, morphological, and autopsy findings, in a 66-year-old woman.

Dual-polarization single-chord plasma interferometry in stellarators/torsatrons.

The well known ordinary wave based interferometry is of frequent use for plasma diagnostics in fusion facilities. With the probing direction being perpendicular to the magnetic field of the facility, the ordinary wave phase shift is proportional to the average density along the probing path at frequencies much higher than the plasma frequency of electrons. In the case of extraordinary waves, the phase shift depends on both the plasma density and the confining magnetic field.

Thermodynamic data of adsorption reveal the entry of CH and CO in a smectite clay interlayer.

The ability of smectite clays to incorporate gases in their interlayers is shown to be conditioned by interlayer spacing, depending, in turn, on phyllosilicate layer composition and effective size of the charge-balancing cations. As illustrated by earlier in situ X-ray diffraction and spectroscopic characterization of the gas/clay interface, most smectites with small-size charge-balancing cations, such as Na or Ca, accommodate CO and CH in their interlayers only in a partially hydrated state resulting in the opening of the basal spacing, above a certain critical value. In the present study CH and CO adsorption isotherms were measured for Na- and Mg-exchanged montmorillonite up to 9 MPa using a manometric technique.

Optimization of Washing Processes in Solvothermal Synthesis of Nickel-Based MOF-74.

Solvothermal synthesis is the most preferable preparation technique of metal-organic frameworks (MOFs) that consists of reactants mixing, ultrasonication, solvothermal reaction, product washing, and solvent evacuation. Owing to fast reaction kinetics in solvothermal reaction, this technique allows for production of uniform MOF particles with high crystallinity, high phase purity, and small particle sizes. However, it exhibits some difficulties of washing processes that may involve the blockage of pores due to incomplete removal of reactive medium from MOF products.

[Specific complications of liver resection and their prevention].

Aim: To improve the results of treatment of patients with focal liver formations by preventing the development of postoperative complications after liver resections.

Methods: The study included 304 patients with benign and malignant liver lesions. In 196 (64.

Smectite fraction assessment in complex natural clay rocks from interlayer water content determined by thermogravimetric and thermoporometry analysis.

The smectite content is a key parameter to be determined for various applications of clays and clay-rich rocks. The quantity of interlayer water characteristic of swelling domains can be used to assess the smectite content in clays. We propose in this study to use a simple approach to determine water distribution in clays (mainly between pores and interlayers) by means of thermoporometry and thermogravimetric analysis.

Solid-state NMR of quadrupolar nuclei for investigations into supported organometallic catalysts: scope and frontiers.

The rational development of heterogeneous catalysts is a prerequisite for improving current catalytic technologies. One of the most successful approaches to achieve this goal is the grafting of organometallic complexes onto a given support, via surface organometallic chemistry (SOMC). In such cases, the immobilization of (transition) metal centres onto an inorganic support affords single-site catalysts with precise tuning of the coordination sphere and thus target-specific catalytic reactivity.

O MAS NMR studies of oxo-based olefin metathesis catalysts: a critical assessment of signal enhancement methods.

The DFS enhancement method as applied to O MAS NMR was critically assessed, first on NaPO, a simple binary glass system, and in a second step, on a series of catalysis-related organometallic molecules and materials. The robustness of DFS was investigated for the wide range of anisotropic parameters (quadrupolar coupling and chemical shift anisotropy) encountered in these samples. Emphasis has been put on the variation of signal enhancements with respect to the DFS final sweep frequency, pulse amplitude and pulse duration, while line shape distortion issues were also addressed.

[Experimental and clinical grounds for using 30% solution of ethyl alcohol for chemical denervation of the gastric acid-producing zone].

Experiments were performed in 18 male rats followed by a histological investigation of the obtained material. The application of the 30% solution of ethyl alcohol was proved to cause irreversible dystrophic alterations of nerve fibers in the gastric wall when injected subserously and there were no irreversible destructive alterations in other organ tissues. Results of treatment of 82 patients with perforated pyloro-duodenal ulcers after suturing the perforated opening in combination with chemical denervation of the gastric acid-producing zone with 30% solution of ethyl alcohol injected subserously were analyzed.