[Endoscopic ultrasonography in diagnosis of chemical esophageal burn and prediction of cicatricial stenosis].

Objective: To analyze the role of endoscopic ultrasonography (EUS) in predicting the risk of cicatricial stenosis after chemical esophageal burn.

Material And Methods: A retrospective study included 56 patients with chemical esophageal burn grade III/IV. Primary endoscopy was performed upon admission.

[Endoscopic vacuum therapy in minimally invasive treatment of esophageal perforations].

Objective: To compare the results of endoscopic vacuum therapy (EVT) and open surgery for esophageal perforations.

Material And Methods: The study included 60 patients with esophageal perforations between 2010 and 2022. The main group included 29 patients who underwent minimally invasive treatment with EVT, the control group - 31 patients after open surgical interventions.

[The role of endosonography in the treatment of chemical ulcerative-necrotic burns of the esophagus].

The authors present ultrasonography-assisted endoscopic diagnosis of chemical burn of the esophagus. This method early predicted decompensated cicatricial stenosis of the esophagus that was valuable to determine treatment strategy. Preventive mini-invasive endoscopic percutaneous gastrostomy provided adequate enteral nutrition in a patient with decompensated esophageal stenosis before reconstructive surgery.

True Molecular Composites: Unusual Structure and Properties of PDMS-MQ Resin Blends.

Poly(dimethyl siloxane)-MQ rubber molecular composites are easy to prepare, as it does not require a heterophase mixing of ingredients. They are characterized by perfect homogeneity, so they are very promising as rubber materials with controllable functional characteristics. The manuscript reveals that MQ resin particles can significantly, more than by two orders of magnitude, enhance the mechanical properties of poly(dimethyl siloxane), and, as fillers, they are not inferior to aerosils.

Hybrid Polycarbosilane-Siloxane Dendrimers: Synthesis and Properties.

A series of carbosilane dendrimers of the 4th, 6th, and 7th generations with a terminal trimethylsilylsiloxane layer was synthesized. Theoretical models of these dendrimers were developed, and equilibrium dendrimer conformations obtained via molecular dynamics simulations were in a good agreement with experimental small-angle X-ray scattering (SAXS) data demonstrating molecule monodispersity and an almost spherical shape. It was confirmed that the glass transition temperature is independent of the dendrimer generation, but is greatly affected by the chemical nature of the dendrimer terminal groups.

The self-diffusion of polymethylsilsesquioxane (PMSSO) dendrimers in diluted solutions and melts.

Recently developed non-functional derivatives of polymethylsilsesquioxane (PMSSO) dendrimers of the first to fifth generation were characterized by 1H, 13C and 29Si NMR spectroscopy. The self-diffusion and NMR relaxation of PMSSO dendrimers in dilute solutions of toluene and melts were investigated in a wide temperature range (-50-80 °C). The hydrodynamic radii of dendrimers were determined from the self-diffusion coefficients measured in diluted solutions according to the Stokes-Einstein equation.

[Difficulties of differential diagnosis and treatment of achalasia cardia after previous hiatal hernia repair].

Esophagocardiomyotomy followed by anterior fundoplication is a standard treatment of achalasia cardia, whereas cruroraphy with complete or partial posterior fundoplication is carried out for hiatal hernia and gastroesophageal reflux disease. The most common postoperative complications of hiatal hernia repair are dysphagia due to malformed cuff, phenomenon of 'telescope' and slow gastric emptying syndrome. Recurrent hiatal hernia is observed in 3-15% of cases.

Close-packed polybutylcarbosilane dendrimers of higher generations.

Variation of generation number strongly affects the type of ordering found for polybutylcarbosilane dendrimers: G5 dendrimers are liquid-like, G6 are cubic liquid crystals and G7/G8 are disordered close-packed. It was revealed that G6 dendrimers are highly likely to form Im3[combining macron]m lattice structures with the parameter a = 5.15 nm, and a domain size that exceeds 100 nm.

Synthesis and Properties of MQ Copolymers: Current State of Knowledge.

In this review, we discuss currently available studies on the synthesis and properties of MQ copolymers. The data on methods of producing hydrolytic and heterofunctional polycondensation of functional organosilanes as well as the obtaining MQ copolymers based on silicic acids and nature silicates are considered. The ratio of M and Q monomers and the production method determine the structure of MQ copolymers and, accordingly, their physicochemical characteristics.

Investigation of Melts of Polybutylcarbosilane Dendrimers by H NMR Spectroscopy.

Melts of polybutylcarbosilane (PBC) dendrimers from third (G3) up to sixth (G6) generations are investigated by H NMR spectroscopy in a wide temperature range up to 493 K. At room temperature, NMR spectra of G3-G5 dendrimers exhibit resolved, solution-like spectra ("liquid" phase). In contrast, the spectrum of the G6 dendrimer is characterized by a single unresolved broad line at whole temperature range, which supports the presence of an anomalous phase state of G6 at temperatures higher than glass transition temperature.

Thermodynamic Properties of Carbosilane Dendrimers of the Sixth Generation with Ethylene Oxide Terminal Groups.

The temperature dependences of heat capacities of carbosilane dendrimers of the sixth generation with ethyleneoxide terminal groups, denoted as G6[(OCH2CH2)1OCH3]256 and G6[(OCH2CH2)3OCH3]256, were measured in the temperature range from T = (6 to 520) K by precision adiabatic calorimetry and differential scanning calorimetry (DSC). In the above temperature range the physical transformations, such as glass transition and high-temperature relaxation transition, were detected. The standard thermodynamic characteristics of the revealed transformations were determined and analyzed.

[Risk factors of suppurative complications in case of thoracic injury].

It was performed retrospective analysis of 463 cases of suppurative thoracic complications after injury (232) and closed thoracic trauma (231) for 20-year period. Incidence of purulent complications was 3.2% and 1.

[Postoperative complications in patients with cervicothoracic injuries].

The results of the diagnosis and treatment of 117 patients with cervicothoracic injuries were analyzed. Different complications were observed in 51 (43.6%) cases.

[Diagnosis and treatment of cervicothoracic injuries].

It analyzed the diagnosis and treatment results of 123 patients with cervicothoracic injuries for 21 years. The frequency of cervicothoracic injuries among all patients with cervical injuries was 5.7%.

A Solid-State NMR Investigation of MQ Silicone Copolymers.

The structure of MQ copolymers of the general chemical formula [(CH)SiO] [SiO] was characterized by means of solid-state magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. The MQ copolymers are highly branched polycyclic compounds (densely cross-linked nanosized networks). MQ copolymers were prepared by hydrolytic polycondensation in active medium.

FTIR spectroscopy and DFT studies of carbosilane dendrimers.

The FTIR spectra of G(3), G(4), and G(9) generations of polybutylcarbosilane dendrimers have been recorded and analyzed. The structural optimization and normal mode analysis were performed for G(1) generation on the basis of density functional theory (DFT). This calculation gave vibrational frequencies and infrared intensities for the t,t- and g,-g-conformers of the butyl terminal groups, attached to the same silicon atom.

[Reactive depressions on psychotic and non-psychotic levels in the remote period of craniocerebral injuries].

This is a report of a staged comparative study of 120 patients with neurotic (n = 60) and psychotic (n = 60) depressions secondary to a traumatic brain disease. Variants of depressive disturbances were identified. Neurotic disorders included neurasthenic, hysterical, and hypochondriac; psychotic ones--paranoid, hysterical, and adynamic.

[Clinico-dynamic features of neurotic and psychotic hysterical depressions in the late period of craniocerebral injuries].

Twenty patients with neurotic and twenty patients with psychotic hysterical depressions developing in the presence of long-term consequences of craniocerebral injuries were subjected to a comparative examination. Differences and transitions between these two conditions are not a uniform intensification of a definite set of symptoms but present a qualitative transformation of the status with extension of disorders to all spheres of mental activity.