Reversed ICu single-atom sites for superior neutral ammonia electrosynthesis with nitrate.

Electrochemical ammonia (NH) synthesis from nitrate reduction (NITRR) offers an appealing solution for addressing environmental concerns and the energy crisis. However, most of the developed electrocatalysts reduce NO to NH via a hydrogen (H*)-mediated reduction mechanism, which suffers from undesired H*-H* dimerization to H, resulting in unsatisfactory NH yields. Herein, we demonstrate that reversed ICu single-atom sites, prepared by anchoring iodine single atoms on the Cu surface, realized superior NITRR with a superior ammonia yield rate of 4.

Spin polarized Fe-Ti pairs for highly efficient electroreduction nitrate to ammonia.

Electrochemical nitrate reduction to ammonia offers an attractive solution to environmental sustainability and clean energy production but suffers from the sluggish *NO hydrogenation with the spin-state transitions. Herein, we report that the manipulation of oxygen vacancies can contrive spin-polarized Fe-Ti pairs on monolithic titanium electrode that exhibits an attractive NH yield rate of 272,000 μg h mg and a high NH Faradic efficiency of 95.2% at -0.

Highly Poison-Resistant Single-Atom Co-N Active Sites with Superior Operational Stability over 460 h for H S Catalytic Oxidation.

Efficient catalytic elimination of hydrogen sulfide (H S) with high activity and durability in nature gas and blast-furnace gas is very critical for both fundamental catalytic research and applied environmental chemistry. Herein, atomically dispersed Co atom catalysts with Co-N sites that can transform H S into S with conversion rate of ≈100% are designed and prepared. The representative 4Co-N/NC achieves a sulfur yield of nearly 100% and TOF of 869 h at 180 °C.

Highly Active and Sulfur-Resistant Fe-N Sites in Porous Carbon Nitride for the Oxidation of H S into Elemental Sulfur.

Iron-based catalysts have been widely studied for the oxidation of H S into elemental S. However, the prevention of iron sites from deactivation remains a big challenge. Herein, a facile copolymerization strategy is proposed for the construction of isolated Fe sites confined in polymeric carbon nitride (CN) (Fe-CNNχ).

Unraveling the mechanisms of S-doped carbon nitride for photocatalytic oxygen reduction to HO.

An in-depth understanding of the microscopic reaction mechanism on a nonmetal-doped catalytic system at the atomic level is one of the critical approaches to developing new efficient catalysts. Herein, the effects of S-doping on melon-based carbon nitride (CN) for the photocatalytic selective oxygen reduction reaction (ORR) have been comprehensively investigated by first-principles calculations. The configurations, electronic properties, optical properties, and the reaction performance of the S-doped melon-based CN have been studied and discussed.

Heteroatom Dopants Promote Two-Electron O Reduction for Photocatalytic Production of H O on Polymeric Carbon Nitride.

Polymeric carbon nitride modified with selected heteroatom dopants was prepared and used as a model photocatalyst to identify and understand the key mechanisms required for efficient photoproduction of H O via selective oxygen reduction reaction (ORR). The photochemical production of H O was achieved at a millimolar level per hour under visible-light irradiation along with 100 % apparent quantum yield (in 360-450 nm region) and 96 % selectivity in an electrochemical system (0.1 V vs.

Fluorescent Se-modified carbon nitride nanosheets as biomimetic catalases for free-radical scavenging.

Efficient biomimetic catalases have been broadly explored for free-radical scavenging and antioxidative stress. Herein, we introduce a non-toxic Se-modified carbon nitride (CN) nanosheet for this bioapplication, and it presents efficient catalase activity, high fluorescence properties, and good biocompatibility. These properties indicate that this material has potential for use as an artificial enzyme against oxidative stress.

The 100 most cited articles in ectopic pregnancy: a bibliometric analysis.

Ectopic pregnancy (EP) remains a major gynecological emergency and is a cause of morbidity or even mortality in women. As a consequence, top citation analysis of EP research in database of the Science Citation Index Expanded is needed to assess the publication trends of leading countries/territories and institutes as well as the research hotspots of EP. A total of 4881 articles relevant to EP were retrieved in the database of the Science Citation Index Expanded from 1965 to present, in which the 100 top-cited articles were selected for further analysis.

Tuning the charge states of CrW2O9 clusters deposited on perfect and defective MgO(001) surfaces with different color centers: A comprehensive DFT study.

The structures and electronic properties of bimetallic oxide CrW2O9 clusters supported on the perfect and defective MgO(001) surfaces with three different color centers, FS (0), FS (+), and FS (2+) centers, respectively, have been investigated by density functional theory calculations. Our results show that the configurations, adsorption energies, charge transfers, and bonding modes of dispersed CrW2O9 clusters are sensitive to the charge states of the FS centers. Compared with the gas-phase configuration, the CrW2O9 clusters supported on the defective surfaces are distorted dramatically, which exhibit different chain structures.

Serum salusin-β levels are associated with the presence and severity of coronary artery disease.

Objectives: We sought to assess whether serum salusin-β levels are correlated with the presence and severity of coronary artery disease (CAD).

Methods: We measured serum salusin-β levels in 278 consecutive patients undergoing coronary angiography (CAG) for the evaluation of CAD and in 126 healthy controls. Serum salusin-β levels were measured by enzyme-linked immunosorbent assay.

Serum S100A12 concentrations are correlated with angiographic coronary lesion complexity in patients with coronary artery disease.

The neutrophil activation marker S100A12 is an important pro-inflammatory cytokine and a potential biomarker for a range of inflammatory diseases. This study aims to investigate whether serum S100A12 concentrations are associated with angiographic coronary lesion complexity in patients with coronary artery disease (CAD). We enrolled 240 CAD and 68 healthy controls.

GABAB receptors resist acute desensitization in both postsynaptic and presynaptic compartments of periaqueductal gray neurons.

The ventrolateral midbrain periaqueductal gray (PAG) neurons have been intensively studied because of their pivotal role in the descending pain modulation system. Activation of GABAB receptors, one type of inhibitory G-protein-coupled receptors (GPCRs), in PAG neurons results in both presynaptic and postsynaptic inhibition. Acute desensitization is defined as rapid attenuation of receptor-mediated signaling.

[Association of ABCG2 gene C421A polymorphism and susceptibility of primary gout in Han Chinese males].

Objective: To assess the association between a C421A single nucleotide polymorphism (SNP) in exon 5 of ATP-binding cassette, sub-family G (WHITE), member 2 (ABCG2) gene and susceptibility of primary gout in Han Chinese males.

Methods: For 200 male patients with primary gout and 235 controls, the genotype of C421A locus was analyzed by PCR and direct sequencing. Blood glucose, uric acid, total cholesterol, triglycerides, creatinine and urea nitrogen was measured by an automatic biochemical analyzer.