Exploring the mediating role of self-efficacy beliefs among EFL university language learners: The relationship of social support with academic enthusiasm and academic vitality.

This study explores the intricate relationship between social support, academic enthusiasm, and academic vitality among English language learners (ELLs) in 2023, with a specific emphasis on the intermediary role of self-efficacy beliefs. Despite the existing body of literature, there has been a notable dearth of discussions concerning the influence of social support on academic enthusiasm and vitality. In 2023, the educational landscape is evolving rapidly, demanding a deeper understanding of the factors that drive student motivation and academic engagement.

The effect of ostrich acellular dermal matrix on keratinized gingival width.

Background: Xenogeneic grafts have gained attention due to advantages in compare of autografts. This study aimed to compare Xeno (ostrich) Acellular Dermal Matrix (XADM) with the free gingival graft (FGG) to increase the width of Keratinized gingiva (KGW) in dogs.

Materials And Methods: This split mouth animal study was performed on 10 mixed breed dogs.

Alkoxysulfenylation of alkenes: development and recent advances.

Among the wide variety of synthetic transformations of inexpensive and abundant feedstock alkenes, vicinal difunctionalization of carbon-carbon double bonds represent one of the most powerful and effective strategies for the introduction of two distinct functional groups into target compounds in a one-pot process. In this context, the direct alkoxysulfenylation of alkenes has emerged as an elegant method to construct valuable β-alkoxy sulfides in an atom- and pot-economic manner utilizing readily accessible starting materials. Here, we review the available literature on this appealing research topic by hoping that it will be beneficial for eliciting further research and thinking in this domain.

Direct synthesis of sulfenamides, sulfinamides, and sulfonamides from thiols and amines.

Needless to say that organosulfur compounds with sulfur-nitrogen bonds have found various applications in diverse fields such as pharmaceuticals, agrochemicals, polymers, and so forth. Three major groups of such compounds are sulfenamides, sulfinamides, and sulfonamides which have been widely applied as building blocks in medical chemistry. Owing to their significant role in drug design and discovery programs, the search for and development of efficient, environmentally friendly, and economic processes for the preparation of the title compounds is of great importance in the pharmaceutical industry.

Recent trends in dehydroxylative trifluoro-methylation, -methoxylation, -methylthiolation, and -methylselenylation of alcohols.

Owing to the prevalence of hydroxyl groups on molecules, much attention has been paid to the synthesis of functionalized organic compounds by dehydroxylative functionalization of parent alcohols. In this context, dehydroxylative trifluoromethylation, trifluoromethoxylation, trifluoromethylthiolation, and trifluoromethylselenylation of readily available alcohols have recently emerged as intriguing protocols for the single-step construction of diverse structures bearing C-CF, C-OCF, C-SCF, and C-SeCF bonds, respectively. This Mini-Review aims to summarize the major progress and advances in this appealing research area with special emphasis on the mechanistic features of the reaction pathways.

Optimization of Frizzled-8 Receptor Inhibition Activity of Carbamazepine: Designing New Anti-Cancer Agent.

Background: Frizzled-8 (FZD8) receptor is a therapeutic target for cancer treatment and recent research has shown that carbamazepine (CBZ) can inhibit this receptor.

Objective: In this work, it has been tried to optimize CBZ to enhance its binding capacity to the N6W binding site of FZD8 by using structure-based drug design methods.

Methods: CBZ and its 83 derivatives were docked to the N6W binding site of FZD8.

Development linear and non-linear QSAR models for predicting AXL kinase inhibitory activity of N-[4-(quinolin-4-yloxy)phenyl]benzenesulfonamides.

In this research, we used CoMFA, LSSVM and FFANN for creating QSAR models for predicting AXL Kinase inhibitory activity of N-[4-(Quinolin-4-yloxy)phenyl]benzenesulfonamides. A CoMFA model with three components was developed and CoMFA contour maps were interpreted to extract chemical features that influence the inhibitory activity of these molecules. for train and test set of CoMFA model were 0.

Clinical and Histomorphometric Assessment of Lateral Alveolar Ridge Augmentation Using a Corticocancellous Freeze-Dried Allograft Bone Block.

Horizontal ridge augmentation with allografts has attracted notable attention because of its proper success rate and the lack of disadvantages of autografts. Corticocancellous block allografts have not been adequately studied in humans. Therefore, this study clinically and histomorphometrically evaluated the increase in ridge width after horizontal ridge augmentation using corticocancellous block allografts as well as implant success after 12 to 18 months after implantation.

Comparison of acidic and neutral PH root conditioners prior to a coronally positioned flap to treat gingival recession.

Background: Localized gingival recession can be treated successfully via coronally positioned flap (CPF) and additional use of root surface demineralization agents. The purpose of this study was to evaluate the effects of additional use of ethylene diamine tetraacetic acid (EDTA) and citric acid as a root conditioner in association with CPF to cover localized buccal gingival recessions.

Materials And Methods: Twenty-seven patients with 66 Miller class I buccal gingival recession ≥ 2 mm on single-rooted teeth were studied.

Electrochemical detection of the MT-ND6 gene and its enzymatic digestion: application in human genomic sample.

A simple electrochemical biosensor was developed for the detection of the mitochondrial NADH dehydrogenase 6 gene (MT-ND6) and its enzymatic digestion by BamHI enzyme. This biosensor was fabricated by modification of a glassy carbon electrode with gold nanoparticles (AuNPs/GCE) and a probe oligonucleotide (ssDNA/AuNPs/GCE). The probe, which is a thiolated segment of the MT-ND6 gene, was deposited by self-assembling immobilization on AuNPs/GCE.

Urinary endothellin-1 level in children with pyelonephritis and hydronephrosis.

Hydronephrosis is a common finding in patients with urinary tract infection (UTI). Endothellin-1 (ET-1) is a potent vasoactive peptide that has vasoconstrictive effects. It has been shown that urinary ET-1 increases in urinary obstructions.

Dibromido(2,3,5,6-tetra-2-pyridyl-pyrazine-κN,N,N)zinc(II).

In the title compound, [ZnBr(2)(C(24)H(16)N(6))], the Zn(II) ion is coordinated by the N,N',N''-tridentate 2,3,5,6-tetra-2-pyridyl-pyrazine ligand and two bromide ions, generating a distorted ZnN(3)Br(2) trigonal-bipyramidal geometry for the metal ion, with both bromide ions in equatorial sites. The dihedral angles between the pyrazine ring and the coordinated pyridine rings are 13.3 (2) and 24.

Dibromido(6-methyl-2,2'-bipyridine-κN,N')zinc(II).

In the title compound, [ZnBr(2)(C(11)H(10)N(2))], the Zn(II) atom is four-coordinated in a distorted tetra-hedral configuration by two N atoms from a 6-methyl-2,2'-bipyridine ligand and two terminal Br atoms. Weak inter-molecular C-H⋯Br hydrogen bonds and π-π stacking inter-actions between the pyridine rings [centroid-centroid distances = 3.763 (5) and 3.

catena-Poly[[(5,5'-dimethyl-2,2'-bi-pyridine-κN,N')cadmium(II)]-di-μ-iodido].

In the title coordination polymer, [CdI(2)(C(12)H(12)N(2))](n), the Cd(2+) ion lies on a twofold rotation axis: it is six-coordinated in a distorted cis-CdN(2)I(4) octa-hedral geometry by two N atoms from a chelating 5,5'-dimethyl-2,2'-bipyridine ligands and four bridging iodide anions. The bridging function of the iodide ions leads to a chain structure propagating in [001].

(4,4'-Dimethyl-2,2'-bipyridine-κN,N')(dimethyl sulfoxide-κO)diiodidocadmium(II).

In the title compound, [CdI(2)(C(12)H(12)N(2))(C(2)H(6)OS)], the Cd(II) cation is coordinated by two N atoms from a dimethyl-bipyridine ligand, one O atom from a dimethyl sulfoxide mol-ecule and two I(-) anions in a distorted trigonal-bipyramidal geometry. Intra-molecular C-H⋯O hydrogen bonding and inter-molecular π-π stacking between parallel pyridine rings [centroid-centroid distance = 3.658 (3) Å] are present in the crystal structure.

Dibromido(2,9-dimethyl-1,10-phenanthroline-κN,N')mercury(II).

In the mol-ecule of the title compound, [HgBr(2)(C(14)H(12)N(2))], the Hg(II) atom is four-coordinated in a distorted tetra-hedral configuration by two N atoms from a 2,9-dimethyl-1,10-phenanthroline ligand and by two Br atoms. In the crystal structure, weak inter-molecular C-H⋯Br hydrogen bonds link the mol-ecules into chains along the b axis. There are π-π contacts between the phenanthroline rings [centroid-centroid distances = 3.

Dichlorido(2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline-κN,N')mercury(II) acetonitrile hemisolvate.

The asymmetric unit of the title compound, [HgCl(2)(C(26)H(20)N(2))]·0.5CH(3)CN, contains two crystallographic-ally independent [HgCl(2)(C(26)H(20)N(2))] mol-ecules and one acetonitrile solvent mol-ecule. The Hg(II) atoms are four-coordin-ated in distorted tetra-hedral configurations by two N atoms from 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline ligands and two Cl atoms.

5,5'-Dimethyl-2,2'-bipyridine.

The asymmetric unit of the title compound, C(12)H(12)N(2), contains two half-mol-ecules related by an inversion center, the planes of their pyridine rings being oriented at a dihedral angle of 69.62 (4)°. In the crystal structure, a π-π contact between the pyridine rings [centroid-centroid distance = 3.

Dichloridobis(phenanthridine-κN)zinc(II).

In the mol-ecule of the title compound, [ZnCl(2)(C(13)H(9)N)(2)], the Zn(II) atom is four-coordinated in a distorted tetra-hedral configuration by two N atoms from two phenanthridine ligands and by two terminal Cl atoms. The dihedral angle between the planes of the phenanthridine ring systems is 69.92 (3)°.

(6,6'-Dimethyl-2,2'-bipyridine-κN,N')diiodidozinc(II).

The complete mol-ecule of the title compound, [ZnI(2)(C(12)H(12)N(2))], is generated by crystallograpic twofold symmetry, with the Zn(II) atom lying on the rotation axis. The Zn(II) atom is coordinated by the N,N-bidentate 6,6'-dimethyl-2,2'-bipyridine ligand and two iodide ions, resulting in a distorted ZnN(2)I(2) tetra-hedral geometry for the metal. In the crystal, there are weak π-π contacts between the pyridine rings [centroid-centroid distance = 3.

Dichlorido(6,6'-dimethyl-2,2'-bipyridine-κN,N')zinc(II).

In the title compound, [ZnCl(2)(C(12)H(12)N(2))], the complete mol-ecule is generated by crystallographic mirror symmetry, with the Zn atom and both chloride ions lying on the reflecting plane, yielding a distorted ZnN(2)Cl(2) tetra-hedral coordination for the metal ion. In the crystal, there are π-π contacts between the pyridine rings [centroid-centroid distance = 3.7857 (17) Å].

Tetra-kis(6-methyl-2,2'-bipyridine)-1κN,N';2κN,N';3κN,N';4κN,N'-tetra-μ-nitrato-1:2κO:O';2:3κO:O',O'';2:3κO,O':O'';3:4κO:O'-tetra-nitrato-1κO,O';4κO,O'-tetra-lead(II).

In the tetranuclear centrosymmetric title compound, [Pb(4)(NO(3))(8)(C(11)H(10)N(2))(4)], irregular PbN(2)O(5) and PbN(2)O(4) coordination polyhedra occur. The hepta-coordinated lead(II) ion is bonded to two bidentate and one monodentate nitrate ion and one bidentate 6-methyl-2,2'-bipyridine (mbpy) ligand. The six-coordinate lead(II) ion is bonded to one bidentate and two monodentate nitrate anions and one mbpy ligand.

Dibromido(di-2-pyridylamine-κN,N')mercury(II).

In the mol-ecule of the title compound, [HgBr(2)(C(10)H(9)N(3))], the Hg(II) atom is four-coordinated in a distorted tetra-hedral configuration by two N atoms from the chelating di-2-pyridylamine ligand and by two Br atoms. In the crystal structure, inter-molecular N-H⋯Br hydrogen bonds link the mol-ecules into centrosymmetric dimers. There are π-π contacts between the pyridine rings [centroid-centroid distances = 3.

Dichlorido(6-methyl-2,2'-bipyridine-κN,N')mercury(II).

In the mol-ecule of the title compound, [HgCl(2)(C(11)H(10)N(2))], the Hg(II) atom is four-coordinated in a distorted tetra-hedral configuration by two N atoms from a 6-methyl-2,2'-bipyridine ligand and two Cl atoms. There is a π-π contact between the pyridine rings [centroid-centroid distance = 3.9758 (5) Å].

Di-μ-bromido-bis-[bromido(4,4'-dimethyl-2,2'-bipyridine-κN,N')mercury(II)].

The asymmetric unit of the title compound, [Hg(2)Br(4)(C(12)H(12)N(2))(2)], contains one half-mol-ecule. The Hg(II) atom is five-coordinated in a trigonal-bipyramidal configuration by two N atoms from the chelating 4,4'-dimethyl-2,2'-bipyridine ligand, two bridging Br and one terminal Br atom, leading to a centrosymmetric dimeric mol-ecule. There is a π-π contact between the pyridine rings [centroid-to-centroid distance = 3.