Achieving Excellent H Evolution Activity of Silver Nanocatalyst by a Simple Electrochemical Treatment Process.

Silver nanoparticles (AgNPs) were synthesized in an aqueous solution via the reduction of AgNO employing citrate reducing agent. The resultant AgNPs were first assayed for the catalytic H evolution in an acidic electrolyte, namely pH 0.3 HSO solution, showing negligible activity.

CuMoS Nanocatalyst-Based Electrochemical Sensor for Ofloxacin Electro-Oxidation: Delineating the Combined Roles of Crystallinity and Morphology on the Analytical Performance.

In this study, we demonstrate the influence of crystallinity and morphology on the analytical performance of various CuMoS (CMS) nanocatalysts-based electrochemical sensors for the high-efficiency detection of Ofloxacin (OFX) antibiotic. The electrochemical kinetics parameters including peak current response (Δ), peak-to-peak separation (Δ), electrochemically active surface area (ECSA), electron-transfer resistance (R), were obtained through the electrochemical analyses, which indicate the single-crystalline nature of CMS nanomaterials (NMs) is beneficial for enhanced electron-transfer kinetics. The morphological features and the electrochemical results for OFX detection substantiate that by tuning the tube-like to plate-like structures of the CMS NMs, it might noticeably enhance multiple adsorption sites and more intrinsic active catalytic sites due to the diffusion of analytes into the interstitial spaces between CMS nanoplates.

A novel method for preparing BiOI nanoplates and their use as precursors to synthesize porous BiVO water oxidation photocatalysts.

In this work, we report an innovative method for synthesizing BiOI nanoplate powder by a slow basification of an aqueous solution constituted of Bi(NO) and KI. The basification was done with NH vapor which was naturally generated on top of an NHOH solution kept in a closed space. The impact of the basification rate on the morphology and crystallinity of the BiOI product was investigated.

[Mo S ] Complex as a Precursor for In-situ Generation of Molybdenum Sulfide Catalyst During the H Evolution.

For decades, the sulfido molybdenum complexes like [MoS ] , [Mo S ] , [Mo S ] have gained great attention because of their chemical versatility as well as their structural similarity to the edge-plan of the molybdenum disulfide (MoS ) which shows promising catalytic ability for the H generation. In this work, we report on the investigation of the dinuclear complex [Mo S ] in both organic and aqueous solution. We demonstrate that [Mo S ] is not intact during the H evolution catalysis when it is assayed as a homogeneous catalyst in an electrolyte solution (e.

Exploring the Sub-nanoscale Structure of Cobalt Molybdenum Sulfide and the Role of a Cobalt Promoter in Catalytic Hydrogen Evolution.

Cobalt-promoted molybdenum sulfide (CoMoS) is known as a promising catalyst for H evolution reaction and hydrogen desulfurization reaction. This material exhibits superior catalytic activity as compared to its pristine molybdenum sulfide counterpart. However, revealing the actual structure of cobalt-promoted molybdenum sulfide as well as the plausible contribution of a cobalt promoter is still challenging, especially when the material has an amorphous nature.

Vietnam Association of Gastroenterology (VNAGE) consensus on the management of infection.

infection is prevalent and has a rapidly increasing antibiotic resistance rate in Vietnam. Reinfection is quite common, and gastric carcinoma remains one of the most common malignancies, which is not uncommon to develop after successful eradication. The purpose of this consensus is to provide updated recommendations on the management of infection in the country.

An External Validation Study of the Oakland and Glasgow-Blatchford Scores for Predicting Adverse Outcomes of Acute Lower Gastrointestinal Bleeding in an Asian Population.

Aims: This study is aimed at (1) validating the performance of Oakland and Glasgow-Blatchford (GBS) scores and (2) comparing these scores with the SALGIB score in predicting adverse outcomes of acute lower gastrointestinal bleeding (ALGIB) in a Vietnamese population.

Methods: A multicenter cohort study was conducted on ALGIB patients admitted to seven hospitals across Vietnam. The adverse outcomes of ALGIB consisted of blood transfusion; endoscopic, radiologic, or surgical interventions; severe bleeding; and in-hospital death.

Investigation on the Growth Mechanism of Cu MoS Nanotube, Nanoplate and its use as a Catalyst for Hydrogen Evolution in Water.

Cu MoS is a ternary transition-metal sulfide that shows great potential in the field of energy conversion and storage, namely catalytic H evolution in water and Li-, Na- or Mg-ion battery. In this work, we report on a growth mechanism of the single-crystalline Cu MoS nanotube from (NH ) MoS salt and Cu O nanoparticle. By probing the nature and morphology of solid products generated in function of reaction conditions we find that the crystalline Cu(NH )MoS nanorod is first generated at ambient conditions.

Gold nanorod/molybdenum sulfide core-shell nanostructures synthesized by a photo-induced reduction process.

Coupling of plasmonic nanostructures and semiconductors gives promising hybrid nanostructures that can be used in different applications such as photosensing and energy conversion. In this report, we describe an approach for fabricating a new hybrid material by coupling a gold nanorod (Au NR) core and amorphous molybdenum sulfide (MoS) shell. The Au NR/MoS core-shell structure is achieved by exploiting the hot electrons generated in the plasmonic excitation of Au NRs to drive the reduction of [MoS], which is pre-adsorbed on the Au NR surface, producing a thin MoS layer.

Development and Validation of a Scoring System to Predict Severe Acute Lower Gastrointestinal Bleeding in Vietnamese.

Background/aims: The prevalence of acute lower gastrointestinal bleeding (ALGIB) has progressively increased worldwide but there are few studies in Asian populations. This study aimed to develop and validate a scoring system to predict severe ALGIB in Vietnamese.

Methods: Risk factors for severe ALGIB were identified by multiple logistic regression analysis using data from a retrospective cohort of 357 patients admitted to a tertiary hospital.

Insights into the Electrochemical Polymerization of [Mo S ] Generating Amorphous Molybdenum Sulfide.

Amorphous molybdenum sulfide is an attractive electrode material for Li/Mg batteries and an efficient Pt-free catalyst for the hydrogen evolution reaction in water. By using the electrochemical quartz crystal microbalance (EQCM) analysis, new insights were gained into the electrochemical polymerization of the [Mo S ] cluster, which generates amorphous molybdenum sulfide thin films. In this work, it is shown that, at the anodic potential, a two-electron oxidative elimination of the terminal disulfide ligand within the [Mo S ] cluster induces the polymerization.

Investigation of the free energy profiles of amantadine and rimantadine in the AM2 binding pocket.

The purpose of this work was to study the mechanism of drug resistance of M2 channel proteins by analyzing the interactions between the drugs amantadine and rimantadine and M2 channel proteins (including the wild type and the three mutants V27A, S31N, and G34A) and the drug binding pathways, by use of a computational approach. Our results showed that multiple drug-binding sites were present in the M2 channel, and the trajectory of the drugs through the M2 channel was determined. A novel method was developed to investigate of free energy profiles of the ligand-protein complexes.

A new piece in the puzzle of the novel avian-origin influenza A (H7N9) virus.

Using phylogenetic analysis on newly available sequences, we characterize A/chicken/Jiangsu/RD5/2013(H10N9) as currently closest precursor strain for the NA segment in the novel avian-origin H7N9 virus responsible for an outbreak in China. We also show that the internal segments of this precursor strain are closely related to those of the presumed precursor for the HA segment, A/duck/Zhejiang/12/2011(H7N3), which indicates that the sources of both HA and NA donors for the reassortant virus are of regional and not migratory-bird origin and highlights the role of chicken already in the early reassortment events.

Discover binding pathways using the sliding binding-box docking approach: application to binding pathways of oseltamivir to avian influenza H5N1 neuraminidase.

Drug binding and unbinding are transient processes which are hardly observed by experiment and difficult to analyze by computational techniques. In this paper, we employed a cost-effective method called "pathway docking" in which molecular docking was used to screen ligand-receptor binding free energy surface to reveal possible paths of ligand approaching protein binding pocket. A case study was applied on oseltamivir, the key drug against influenza a virus.

A computational study of mixed aggregates of chloromethyllithium with lithium dialkylamides.

DFT calculations were performed to examine the possible formation of mixed aggregates between chloromethyllithium carbenoids and lithium dimethylamide (LiDMA). In the gas phase mixed aggregates were readily formed and consisted of mixed dimers, mixed trimers, and mixed tetramers. THF solvation disfavored the formation of mixed tetramers and resulted in less exergonic free energies of mixed dimer and mixed trimer formation.

Structure, bonding, and solvation of lithium vinylcarbenoids.

[reaction: see text] Molecular modeling was used to determine the structure of lithium vinylcarbenoids in the gas phase and in THF solution. Solvent effects were modeled by microsolvation with explicit THF ligands on each of the lithium atoms. The carbenoid geometries are dependent on the heteroatom and on solvation.