Diels-Alder/Ene Reactivities of 2-(1'-Cycloalkenyl)thiophenes and 2-(1'-Cycloalkenyl)benzo[]thiophenes with -Phenylmaleimides: Role of Cycloalkene Ring Size on Benzothiophene and Dibenzothiophene Product Distributions.

Scaffolds of thiophene and benzothiophene are the important class of bioactive compounds found abundant in nature. The Diels-Alder reactions of 2-(1'-cycloalkenyl)thiophenes and 2-(1'-cycloalkenyl)benzo[]thiophenes having the alkene groups present in five-, six-, seven-, eight-, and twelve-membered rings with substituted -phenylmaleimides are characterized. The size of the cycloalkene rings plays a critical role in dictating the product distributions of expected and isomerized Diels-Alder adducts.

Analysis of Natural Gas Using a Portable Hollow-Core Photonic Crystal Coupled Raman Spectrometer.

The low accessibility of natural gas fields and transporting pipelines requires portable online analyzers of the composition of natural gas, ensuring nearly chromatographic precision and capable of in situ analysis of a wide range of gases, including infrared-inactive ones (hydrogen, oxygen, nitrogen, chlorine). We have developed an express method of gas analysis meeting all the requirements for analysis of natural gas and its derivative mixtures using a portable 532 nm Raman spectrometer rigidly connected to a hollow-core crystal photonic fiber.

[The analysis of drug abuse situation in the Khanty-Mansi Autonomous Okrug - Yugra].

The article presents the analysis of drug abuse situation in municipalities and districts of the Khanty-Mansi Autonomous Okrug - Yugra (KHMAO-Yugra) in 2017-2018, as well as the dynamics of changes of the drug abuse situation in KHMAO-Yugra as a whole in 2015-2018. By 2018, the drug abuse situation in the KHMAO-Yugra improved as compared with previous years of the study period and corresponded to the "tense" level, which indicates the need to continue systematic and targeted intersectoral work aimed at reducing morbidity and mortality associated with the use of drugs and psychoactive substances in this northern region of Russia.

Ethno-National Attitudes as Intercultural Competence Predictors in University Students: Gender Differences.

The search for predictors of intercultural competence (ICC) development is one of the important challenges of modern psychology in connection with globalization in all the spheres of modern life, including university education. The purpose of the present research is to show that the ethno-national attitudes (ENA), which Khukhlaev et al. consider as an individual's predisposition to assess the nationality/ethnicity can determine the severity of ICC features in male and female university students.

One- and Two-Dimensional Iodine-Rich Iodobismuthate(III) Complexes: Structure, Optical Properties, and Features of Halogen Bonding in the Solid State.

Reactions of BiI, I, and iodide salts of two different pyridinum cations result in the formation of the novel iodine-rich iodobismuthates(III) (1,3-MePy){[BiI](I)} () and (1-MePy){[BiI](I)) (), where the halometalate anions are connected by diiodine linkers into one- or two-dimensional supramolecular structures. Both complexes reveal narrow optical band gaps and fairly high thermal stability, favoring their potential use in photovoltaic devices.

The (Dioximate)Ni/I System: Ligand Oxidation and Binding Modes of Triiodide Species.

Reinvestigation of (-benzoquinonedioximate)Ni/I systems demonstrated that the reaction itself and also the crystallization conditions dramatically affect the identity of generated species. Crystallization (CHCl, 20-25 °C) of the nickel(II) dioximate complex [Ni(bqoxH)] (bqoxH = -benzoquinonedioxime) with I in the 1:(1-10) molar ratios of the reactants led to several (-benzoquinonedioximate)Ni derivatives and/or iodine adducts [Ni(I)(bqoxH)(bqoxH)]·/I, [Ni(I)(bqoxH)(bqoxH)]·[Ni(bqoxH)], and [Ni(I)(bqox)(bqoxH)]·I; the latter one, featuring the anion-radical bqox ligand, is derived from the formal (-2H/1)-oxidation of bqoxH. In these three adducts, various types of noncovalent interactions were identified experimentally and their existence was supported theoretically.

Endoscopic ultrasound-guided drainage of pancreatic walled-off necrosis using 20-mm versus 15-mm lumen-apposing metal stents: an international, multicenter, case-matched study.

Backgrounds: Endoscopic ultrasound (EUS)-guided placement of lumen-apposing metal stents (LAMSs) has gained popularity for the treatment of pancreatic walled-off necrosis (WON). We compared the 20-mm and 15-mm LAMSs for the treatment of symptomatic WON in terms of clinical success and adverse events.

Methods: We conducted a retrospective, case-matched study of 306 adults at 22 tertiary centers from 04/2014 to 10/2018.

How Strong is Hydrogen Bonding to Amide Nitrogen?

The protonation of the carboxamide nitrogen atom is an essential part of in vivo and in vitro processes (cis-trans isomerization, amides hydrolysis etc). This phenomenon is well studied in geometrically strongly distorted amides, although there is little data concerning the protonation of undistorted amides. In the latter case, the participation of amide nitrogen in hydrogen bonding (which can be regarded as the incipient state of a proton transfer process) is less well-studied.

Creativity and Personality Traits as Foreign Language Acquisition Predictors in University Linguistics Students.

Foreign (second) language (FL/SL) proficiency is one of the most important competencies for a modern person, and is necessary for both professional and personal fulfillment. The purpose of this study is to consider and compare personality traits and creativity as predictors of success in foreign language acquisition (FLA). The sample includes 128 (105 female and 23 male) first- and second-year university linguistics students.

[{AgL}MoO] complexes: a combined experimental and theoretical study.

Self-assembly reactions between AgNO, L (PPh, PPhPy, AsPh, SbPh) and [β-MoO] in DMF led to the formation of [β-{AgL}MoO] anions, which were isolated as BuN salts (1-4) and characterized by XRD, IR and elemental analysis. In the crystal structures Ag can switch the coordination number from 5 (P, As) to 6 (Sb) by uptake of a DMF molecule. High-level QAIM analysis of the coordination sphere around Ag shows critical points even in the case of longer Ag-O distances.

Hexaiododiplatinate(ii) as a useful supramolecular synthon for halogen bond involving crystal engineering.

Hexaiododiplatinates(ii) bearing ammonium and phosphonium cations, [R4N]2[Pt2(μ-I)2I4] {R = Et (1) and n-Bu (2)} and [R3PR1]2[Pt2(μ-I)2I4] {R = n-Bu and R1 = n-Bu (3); R = Ph and R1 = Ph (4); R = Ph and R1 = CH2Ph (5)}, were synthesized and characterized by high resolution ESI-MS, 1H, 13C{1H}, 31P{1H}, and 195Pt NMR spectroscopy, Fourier transform infrared and Raman spectroscopy, X-ray diffraction (XRD), X-ray powder diffraction, and also electrostatic surface potential calculations. Complexes 1-3 were cocrystallized with halogen bond (XB) donors based on organic iodides featuring electron withdrawing groups {REWGIs: 1,3,5-triiodotrifluorobenzene (1,3,5-FIB), iodopentafluorobenzene (IPFB), 1,4-diiodotetrafluorobenzene (1,4-FIB), and tetraiodoethylene (C2I4)} to give crystalline adducts 1·2(1,3,5-FIB), 1·2IPFB, 2·2(1,4-FIB), and 3·C2I4. Inspection of the XRD data of the obtained adducts revealed the presence, in all four structures, of intermolecular REWGII-Pt XBs between the iodine centers of REWGIs and the terminal iodide ligands of [Pt2(μ-I)2I4]2- anions, where the latter act as rectangular XB-accepting synthons forming XBs with two, three, and even four Pt-Iterminal ligands.

[Dual-energy computed tomography in the diagnostics of urolithiasis].

The Aim: To assess the diagnostic performance of dual-energy computed tomography (DECT) in the evaluation of the composition of urinary stones "in vivo".

Materials And Methods: A total of 91 patients aged from 20 to 70 years old (mean 42.7) with urinary stone disease were examined at Sechenov University, including 68 men (75%) and 23 women (25%).

Study of acoustic and low-pressure exposure on the temperature of the evaporation of a liquid with free interface before it freezes.

On the basis of the first law of thermodynamics, a thermodynamic physical and mathematical model of the process of evaporation and freezing in a partially filled closed volume of a liquid under acoustic exposure (AE) and pressure reduction has been developed. The acoustic effect on the liquid is taken as a component on the heating of the liquid in the closed volume. The experimental studies performed under AE (amplitude 2.

Endoscopic Therapy for Pancreatic Fluid Collections: A Definitive Management Using a Dedicated Algorithm.

Background/aims:  Endoscopic ultrasonography (EUS)-guided drainage is the preferred approach for infected or symptomatic pancreatic fluid collections (PFCs). Here, we developed an algorithm for the management of pancreatitis complicated by PFCs and report on its effcacy and safety.

Methods: Between September 2011 and October 2017, patients were prospectively managed according to the algorithm.

gen. nov., sp. nov., a moderately thermophilic bacterium from a Chukotka hot spring (Arctic, Russia), representing a novel class, , which includes the previously uncultivated lineage OLB14.

A novel aerobic moderately thermophilic bacterium, strain 3753O, was isolated from a Chukotka hot spring (Arctic, Russia) using the newly developed technology of laser engineering of microbial systems. Сells were regular short rods, 0.4×0.

The Nature of P(σλ↔σλ) Dualism: 3a,6a-Diaza-1,4-diphosphapentalene as a Form of Stabilized Singlet Phosphinidene.

The current study provides a clear understanding of the chemical properties of annelated 3a,6a-diaza-1,4-diphosphapentalenes (DDPs), which are best viewed as stabilized singlet phosphinidenes. It was found that DDPs undergo reversible oligomerization in solution, which provides 1,2,3-diazaphosphole-substituted cyclotetraphosphines, isolated and characterized by X-ray crystal structure analysis. Transformation of the 10-π-electron heteropentalene system into a stabilized phosphinidene occurs when the P-N bond is lengthened, which is facilitated by weak Lewis acids and bases.

Pelomicrobium methylotrophicum gen. nov., sp. nov. a moderately thermophilic, facultatively anaerobic, lithoautotrophic and methylotrophic bacterium isolated from a terrestrial mud volcano.

A novel moderately thermophilic, bacterium, strain SM250, was isolated from a terrestrial mud volcano, Taman peninsula, Krasnodar region, Russia. Cells of strain SM250 were Gram-negative non-spore forming motile straight rods. Growth was observed at temperatures 30-63 °C (optimum at 50 °C), pH 6.

Fully covered self-expanding metal stents for refractory pancreatic duct strictures in symptomatic chronic pancreatitis, US experience.

 Fully covered self-expanding metal stents (FCSEMS) have been used to treat refractory pancreatic duct strictures. We aimed to evaluate the feasibility, safety, and efficacy of FCSEMS in chronic pancreatitis with refractory pancreatic duct strictures.  This was a retrospective multicenter cases series of patients who underwent endoscopic retrograde cholangiopancreatography (ERCP) with FCSEMS placement in the main pancreatic duct (MPD) at five tertiary care centers between February 2010 and June 2016.

Structural data of phenanthrene-9,10-dicarbonitriles.

In this data article, we present the single-crystal XRD data of phenanthrene-9,10-dicarbonitriles. Detailed structure analysis and photophysical properties were discussed in our previous study, "Intermolecular interactions-photophysical properties relationships in phenanthrene-9,10-dicarbonitrile assemblies" (Afanasenko et al., 2020).

Dihalomethanes as Bent Bifunctional XB/XB-Donating Building Blocks for Construction of Metal-involving Halogen Bonded Hexagons.

The dihalomethanes CH X (X=Cl, Br, I) were co-crystallized with the isocyanide complexes trans-[MX (CNC H -4-X ) ] (M=Pd, Pt; X =Br, I; X =F, Cl, Br) to give an extended series comprising 15 X-ray structures of isostructural adducts featuring 1D metal-involving hexagon-like arrays. In these structures, CH X behave as bent bifunctional XB/XB-donating building blocks, whereas trans-[MX (CNC H -4-X ) ] act as a linear XB/XB acceptors. Results of DFT calculations indicate that all XCH -X⋅⋅⋅X -M contacts are typical noncovalent interactions with estimated strengths in the range of 1.

Generic Nature of Interfacial Phenomena in Solutions of Nonionic Hydrotropes.

Nonionic hydrotropes (low-molecular-weight amphiphiles) demonstrate striking dual actions in bulk solutions and interfaces, exhibiting both surfactant-like and co-solvent properties. We report on peculiar, strongly affected by this duality, liquid-liquid and air-liquid-liquid interfacial behavior in aqueous ternary systems, containing hydrotropes and hydrocarbons, in a broad range of compositions and at various temperatures. Phase diagrams of the studied systems, containing tertiary butanol (TBA), as a hydrotrope, are of Type 1: the hydrotrope, at the experimental conditions, is completely miscible with water and with all investigated hydrocarbons [cyclohexane (CHX), toluene (TOL), and -decane (DEC)], whereas the ternary mixtures exhibit liquid-liquid phase separation terminated at corresponding critical points.

Regulation of by PhoB during P Starvation Promotes Biofilm Formation by Escherichia coli O157:H7.

In open environments such as water, enterohemorrhagic O157:H7 responds to inorganic phosphate (P) starvation by inducing the Pho regulon controlled by PhoB. This activates the phosphate-specific transport (Pst) system that contains a high-affinity P transporter. In the Δ mutant, PhoB is constitutively activated and regulates the expression of genes in the Pho regulon.

Four-Center Nodes: Supramolecular Synthons Based on Cyclic Halogen Bonding.

The isocyanide trans-[PdBr (CNC H -4-X') ] (X'=Br, I) and nitrile trans-[PtX (NCC H -4-X') ] (X/X'=Cl/Cl, Cl/Br, Br/Cl, Br/Br) complexes exhibit similar structural motif in the solid state, which is determined by hitherto unreported four-center nodes formed by cyclic halogen bonding. Each node is built up by four Type II C-X'⋅⋅⋅X-M halogen-bonding contacts and include one Type I M-X⋅⋅⋅X-M interaction, thus giving the rhombic-like structure. These nodes serve as supramolecular synthons to form 2D layers or double chains of molecules linked by a halogen bond.

[LUTS/BPH who treats?. The results of the epidemiologic study].

Introduction: In this study an attempt was made to determine some reasons that prompted the urologist to make a choice in favor of particular drug or combination from a wide variety of available drugs. The prescribing habits and subjective evaluation of efficiency and safety of the drugs for the treatment of lower urinary tract symptoms/benign prostatic hyperplasia by the urologists in Russia was analyzed.

Materials And Methods: a prospective multicenter epidemiological study "LUTS/BPH - who treats?" was carried out in 12 centers using data obtained from May 1 to July 31, 2018 with anonymous survey of 500 urologists living in 9 cities of the Russian Federation.

Cellulose Nanofibrils and Tubular Halloysite as Enhanced Strength Gelation Agents.

Silica gels are widely employed in water shutoff services, making them an essential tool in oil well management. Silica nanoparticles may serve as a strengthening additive for polymer hydrogels. In this study, we look at this statement from a different angle: What additives could be used to increase the strength of silica gels? Colloidal silica gels were prepared with various additives, and gel strength was measured by a Veiler-Rebinder apparatus.