Determination of zinc complexation with an immobilized reagent for the analysis of environmental objects.

Although significant progress has been made in the effective measurement of Zn(II), Аlizarin red S (ARS) was immobilized on polyethylene polyamine-modified polyacrylonitrile (PPF-1) via a new matrix. This approach allows the detection of low levels of Zn(II) ions in various water samples via preconcentrated atomic absorption spectrometry. The use of PPF-1 in a polymer matrix for zinc preconcentration presents several advantages over traditional sorbtion-spectroscopic methods, including reduced cost, high zinc recovery, increased sensitivity, and selectivity.

Synthesis, crystal structure and Hirshfeld surface analysis of bis-(acetyl-acetonato-κ ,')(2-amino-1-methyl-1-benzimidazole-κ )copper(II).

The title compound, [Cu(CHO)(CHN)], crystallizes in the ortho-rhom-bic space group . In the crystal structure, the Cu ion is coordinated by two acetyl-acetonate ligands and one 2-amino-1-methyl-1-benzimidazole ligand. The crystal structure features intra-molecular N-H⋯O and inter-molecular N-H⋯O hydrogen bonds, which contribute to the overall cohesion of the crystal.

Synthesis, crystal structure, Hirshfeld surface analysis and DFT calculations of the coordination compound tetra-aqua-bis-{2-[(5-methyl-1,3,4-thia-diazol-2-yl)sulfan-yl]acetato-κ}cobalt(II).

A novel coordination compound, [Co()(HO)], was synthesized from aqueous solutions of Co(NO) and the ligand 2-[(5-methyl-1,3,4-thia-diazol-2-yl)sulfan-yl]acetic acid (H, CHNOS). In the monoclinic crystals (space group 2/), the cobalt(II) ion is located about a centre of symmetry and is octa-hedrally coordinated by two anions in a monodentate fashion through carboxyl O atoms and by four water mol-ecules. A relatively strong hydrogen bond between one of the water mol-ecules and the non-coordinating carboxyl-ate O atom consolidates the conformation.

Synthesis, crystal structure and Hirshfeld surface analysis of (2-amino-1-methyl-benzimidazole-κ )aqua-bis-(4-oxopent-2-en-2-olato-κ ,')nickel(II) ethanol monosolvate.

The mol-ecule of the title compound, [Ni(CHO)(CHN)(HO)]·CHOH, has triclinic () symmetry. This compound is of inter-est for its anti-microbial properties. The asymmetric unit comprises two independent complex mol-ecules, which are linked by N-H⋯O and O-H⋯O hydrogen bonds along [111].

Synthesis, crystal structure, and Hirshfeld surface analysis of 1,3-di-hydro-2-benzimidazol-2-iminium 3-carb-oxy-4-hy-droxy-benzene-sulfonate.

The asymmetric unit of the title salt, CHN ·CHOS, comprises two 1,3-di-hydro-2-benzimidazol-2-iminium cations and two 2-hy-droxy-5-sulfobenzoate anions (' = 2). In the crystal, the mol-ecules inter-act through N-H⋯O, O-H⋯O hydrogen bonds and C-O⋯π contacts. The hydrogen-bonding inter-actions lead to the formation of layers parallel to (01).

Norfloxacinium nitrate.

In the title salt [systematic name: 4-(3-carb-oxy-1-ethyl-6-fluoro-4-oxo-1,4-di-hydro-quin-olin-7-yl)piperazin-1-ium nitrate], CHFNO ·NO , proton transfer from nitric acid to the N atom of the piperazine ring of norfloxacin has occurred to form a mol-ecular salt. In the extended structure, N-H⋯O hydrogen bonds link alternating cations and anions into [100] chains, which are reinforced by aromatic π-π stacking inter-actions between the quinoline moieties of the norfloxacinium cations.

Highly sensitive two-dimensional profiling of N-linked glycans by hydrophilic interaction liquid chromatography and dual stacking capillary gel electrophoresis.

Background: N-Glycosylation is one of the most important post-translational modifications in proteins. As the N-glycan profiles in biological samples are diverse and change according to the pathological condition, various profiling methods have been developed, such as liquid chromatography (LC), capillary electrophoresis (CE), and mass spectrometry. However, conventional analytical methods have limitations in sensitivity and/or resolution, hindering the discovery of minor but specific N-glycans that are important both in the basic glycobiology research and in the medical application as biomarkers.

Synthesis and crystal structure of bis-(2-aminobenzimidazolium) -[metavanadate(V)].

The structure of polymeric -poly[2-amino-benzimidazolium [[dioxidovanadium(V)]-μ-oxido]], {(CHN)[VO]} , has monoclinic symmetry. The title compound is of inter-est with respect to anti-cancer activity. In the crystal structure, infinite linear zigzag vanadate (VO) chains, constructed from corner-sharing VO tetra-hedra and that run parallel to the axis, are present.

Developing named entity recognition algorithms for Uzbek: Dataset insights and implementation.

This paper presents a dataset and approaches to named entity recognition (NLP) in Uzbek language, in a resource-constrained language environment. Despite the increase in NLP applications, the Uzbek language is still underrepresented, which underscores the importance of our work. Our dataset includes 1,160 sentences with nearly 19,000 word forms annotated for parts of speech and named entities, making it a valuable resource for linguistic research and machine learning applications in Uzbek.

Synthesis, crystal structure and Hirshfeld surface analysis of bromido-tetra-kis-[5-(prop-2-en-1-yl-sulf-an-yl)-1,3,4-thia-diazol-2-amine-κ]copper(II) bromide.

A novel cationic complex, bromido-tetra-kis-[5-(prop-2-en-1-ylsulfan-yl)-1,3,4-thia-diazol-2-amine-κ ]copper(II) bromide, [CuBr](CHNS)Br, was synthesized. The complex crystallizes with fourfold mol-ecular symmetry in the tetra-gonal space group 4/. The Cu atom exhibits a square-pyramidal coord-ination geometry.

Parallel texts dataset for Uzbek-Kazakh machine translation.

This paper presents a parallel corpus of raw texts between the Uzbek and Kazakh languages as a dataset for machine translation applications, focusing on the data collection process, dataset description, and its potential for reuse. The dataset-building process includes three separate stages, starting with a tiny portion of already available parallel data, then some more compiled from openly available resources like literature books, and web news texts, which were aligned using the sentence alignment method, encompassing a wide range of topics and genres. Finally, the majority of the dataset was taken from a raw text corpus in Uzbek and manually translated into Kazakh by a group of experts who are fluent in both languages.

2-Amino-benzoxazole-oxalic acid (2/1).

In the title compound, 2CHNO·CO , proton transfer from oxalic acid to the N atom of the heterocycle has occurred to form a 2:1 molecular salt. In the extended structure, N-H⋯O hydrogen bonds link the components into [100] chains, which feature (8) and (14) loops.

Synthesis, crystal structure and Hirshfeld surface analysis of a cadmium complex of naphthalene-1,5-di-sulfonate and -phenyl-enedi-amine.

A novel -phenyl-enedi-amine (opda)-based cadmium complex, bis-(benzene-1,2-di-amine-κ ,')bis-(benzene-1,2-di-amine-κ)cadmium(II) naphthalene-1,5-di-sulfonate, [Cd(CHN)](CHOS), was synthesized. The complex salt crystallizes in the monoclinic space group 2/. The Cd atom occupies a special position and coordinates six nitro-gen atoms from four -phenyl-enedi-amine mol-ecules, two as chelating ligands and two as monodentate ligands.

Molecular-genetic and cytogenetic analyses of cotton chromosome introgression from Gossypium barbadense L. into the genome of G. hirsutum L. in BC2F1 hybrids.

Substitution lines of the cotton Gossypium hirsutum L. involving chromosomes of the tetraploid species G. barbadense L.

Effects of Synthetic Tetronamides and Methylated Denigrins on Bacterial Quorum Sensing and Biofilm Formation.

Detrimental biofilms of bacterial pathogens cause chronic infections with a high-level tolerance to antibiotics. To identify new control agents, we synthesized and tested a total of 14 tetronamides (including 5 new compounds) and 6 denigrin intermediates on the model species . At a concentration of 50 μg/mL, two tetronamides and two methylated denigrins exhibited significant inhibitory effects against biofilm formation of RP437, e.

Synthesis, structure and Hirshfeld surface analysis of a coordination compound of cadmium acetate with 2-amino-benzoxazole.

A first coordination compound of 2-amino-benzoxazole (), namely, bis-(2-amino-benzoxazole-κ )bis-(acetato-κ ,')cadmium(II), [Cd(CHCOO)()], has been synthesized from ethanol solutions of Cd(CH(COO) and . In the monoclinic crystals with the space group 2/, the cadmium ions coordinate two neutral mol-ecules in a monodentate fashion through the oxazole N atom, while two acetate ligands are coordinated through the O atoms in a bidentate manner. The coordination polyhedron of the central ion is substanti-ally distorted octa-hedral.

Syntheses, crystal structures and Hirshfeld surface analysis of 2-(benzyl-sulfan-yl)-5-[4-(di-methyl-amino)-phen-yl]-1,3,4-oxa-diazole and 2-[(2-chloro-6-fluoro-benz-yl)sulfan-yl]-5-[4-(di-methyl-amino)-phen-yl]-1,3,4-oxa-diazole.

The title compounds were synthesized by alkyl-ation of 5-[(4-di-methyl-amino)-phen-yl]-1,3,4-oxa-diazole-2-thiol with benzyl chloride or 2-chloro-6-fluoro-benzyl chloride in the presence of potassium carbonate. The yields of 2-(benzyl-sulfan-yl)-5-[4-(di-methyl-amino)-phen-yl]-1,3,4-oxa-diazole, CHNOS (I), and 2-[(2-chloro-6-fluoro-benz-yl)sulfan-yl]-5-[4-(di-methyl-amino)-phen-yl]-1,3,4-oxa-diazole, CHClFNOS (II), were 96 and 92%, respectively. In the crystal structures of (I) and (II), C-H⋯π inter-actions are observed between neighboring mol-ecules.

Water-Soluble Ionic Metal-Organic Polyhedra as a Versatile Platform for Enzyme Bio-immobilization.

Metal-organic polyhedra (MOPs) can act as elementary structural units for the design of modular porous materials; however, their association with biological systems remains greatly restricted by their typically low stabilities and solubilities in water. Herein, we describe the preparation of novel MOPs bearing either anionic or cationic groups and exhibiting a high affinity for proteins. Simple mixing of the protein bovine serum albumin () and ionic MOP aqueous solutions resulted in the spontaneous formation of MOP-protein assemblies, in a colloidal state or as solid precipitates depending on the initial mixing ratio.

Nano-enabled Quenching of Bacterial Communications for the Prevention of Biofilm Formation.

Biofilm formation is a major threat to industry, the environment and human health. While killing of embedded microbes in biofilms may inevitably lead to the evolution of antimicrobial resistance (AMR), catalytic quenching of bacterial communications by lactonase is a promising antifouling approach. Given the shortcomings of protein enzymes, it is attractive to engineer synthetic materials to mimic the activity of lactonase.

Syntheses, crystal structures and Hirshfeld surface analyses of -aryl-sulfonyl derivatives of cytisine.

By aryl-sulfonyl-ation of cytisine in the presence of tri-ethyl-amine, three new compounds have been obtained in good yields: (7,9)--[(4-ethyl-phen-yl)sulfon-yl]cytisine, CHNOS () {systematic name: (1,5)-3-[(4-ethyl-phen-yl)sulfon-yl]-1,2,3,4,5,6-hexa-hydro-8-1,5-methano-pyrido[1,2-][1,5]diazo-cin-8-one}, (7,9)--[(4-chloro-phen-yl)sulfon-yl]cytisine, CHClNOS () {systematic name: (1,5)-3-[(4-chloro-phen-yl)sulfon-yl]-1,2,3,4,5,6-hexa-hydro-8-1,5-methano-pyrido[1,2-][1,5]diazo-cin-8-one} and (7,9)--[(3-nitro-phen-yl)sulfon-yl]cytisine, CHNOS () {systematic name: (1,5)-3-[(3-nitro-phen-yl)sulfon-yl]-1,2,3,4,5,6-hexa-hydro-8-1,5-methano-pyrido[1,2-][1,5]diazo-cin-8-one}. The crystal structures of the compounds were determined on the basis of single-crystal X-ray diffraction data. The crystal structures of ()-() are distinguished by the arrangement of two fragments of the mol-ecule around the sulfonyl site.

Rinderidine and oblongifolidine new pyrrolizidine alkaloids from M. Popov and their absolute configurations.

The alkaloid composition of was studied, in which the pyrrolizidine alkaloids echinatine and trachelanthamine N-oxide, as well as two new quaternary salts namely rinderidine and the oblongifolidine were isolated. The structures of the isolated new alkaloids were elucidated by NMR spectroscopy. The absolute configuration of lindelofine, trachelanthamine N-oxide, rinderidine and oblongifolidine was established by single crystal X-ray diffraction as: 1 , 4 , 8 , 2', 3'; 1 , 4, 8, 2', 3'; 4 , 7, 8 , 2', 3'; 4 , 7, 8 , 2', 3' (7'', 8'') respectively.

Crystal structure, Hirshfeld surface analysis and DFT calculations of 7-bromo-2,3-di-hydro-pyrrolo[2,1-]quinazolin-9(1)-one.

The mol-ecular structure of the title compound, CHBrNO, is almost planar. The benzene and pyrimidine rings are essentially coplanar, with r.m.

Crystal structure and void analysis of tris-(2-amino-1-methyl-benzimidazolium) hexa-kis-(nitrato-κ ,')lanthanate(III).

The organic-inorganic complex salt, (CHN)[La(NO)], comprises a network of N-protonated 2-amino-1-methyl-benzimidazolium cations and hexa-kis-(nitrato)lanthanate(III) anions. The La atom is twelve-coordinate within a distorted icosa-hedral environment. In the unit cell, each pair of the La atoms lie nearly on one of the crystallographic glide planes.