Dual Zn-NiS Sites in a Redox-Active Metal-Organic Framework Enables Efficient Cascade Catalysis for Nitrate-to-Ammonia Conversion.

Electrocatalytic Nitrate Reduction to Ammonia (NORR) offers a promising solution to both environmental pollution and the sustainable energy conversion. Here we propose an efficient cascade catalytic mechanism based on a dual Zn-NiS sites, orderly assembled in a redox-active metal-organic framework structure, which separately promotes the reaction kinetics of nitrate-to-nitrite and nitrite-to-ammonia conversions. Specifically, the Zn clusters adsorb and selectively reduce the NO to NO , whereas [NiS] acts as an analogue to the ferredoxins, subsequently boosts the reduction of NO to produce NH.

Transcriptome-wide mapping of internal mRNA N-methylguanosine in sporulated and unsporulated oocysts of Eimeria tenella reveals stage-specific signatures.

Background: Growing evidence indicates that N-methylguanosine (mG) modification plays critical roles in epigenetic regulation. However, no data regarding mG modification are currently available in Eimeria tenella, a highly virulent species causing coccidiosis in chickens.

Methods: In the present study, we explore the distribution of internal messenger RNA (mRNA) mG modification in sporulated and unsporulated oocysts of E.

A General Metal Ion Recognition Strategy to Mediate Dual-Atomic-Site Catalysts.

Heterogeneous dual-atomic-site catalysts (DACs) hold great potential for diverse applications. However, to date, the synthesis of DACs primarily relies on different atoms freely colliding on the support during synthesis, principally leading to low yields. Herein, we report a general metal ion recognition (MIR) strategy for constructing a series of DACs, including but not limited to FeSn, FeCo, FeNi, FeCu, FeMn, CoNi, CoCu, Co, and Cu.

Self-Referenced Au Nanoparticles-Coated Glass Wafers for In Situ SERS Monitoring of Cell Secretion.

Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for discrimination of bimolecules in complex systems. However, its practical applications face challenges such as complicated manufacturing procedures and limited scalability of SERS substrates, as well as poor reproducibility during detection which compromises the reliability of SERS-based analysis. In this study, we developed a convenient method for simultaneous fabrication of massive SERS substrates with an internal standard to eliminate the substrate-to-substrate differences.

Cu/CuO/Graphdiyne Tandem Catalyst for Efficient Electrocatalytic Nitrate Reduction to Ammonia.

The electrocatalytic reduction reaction of nitrate (NO ) to ammonia (NH) is a feasible way to achieve artificial nitrogen cycle. However, the low yield rate and poor selectivity toward NH product is a technical challenge. Here a graphdiyne (GDY)-based tandem catalyst featuring Cu/CuO nanoparticles anchored to GDY support (termed Cu/CuO/GDY) for efficient electrocatalytic NO reduction is presented.

"Atomic Topping" of MnO on AlO to Create Electron-Rich, Aperiodic, Lattice Oxygens that Resemble Noble Metals for Catalytic Oxidation.

Enhancing the catalytic oxidation activity of traditional transition-metal oxides to rival that of noble metals has been a prominent focus in the field of catalysis. However, existing synthesis strategies that focus on controlling the electronic states of metal centers have not yet fully succeeded in achieving this goal. Our current research reveals that manipulating the electronic states of oxygen centers can yield unexpected results.

Graphdiyne Enabled Nitrogen Vacancy Formation in Copper Nitride for Efficient Ammonia Synthesis.

The electrocatalytic reduction of nitrate is promising for sustainable ammonia synthesis but suffers from slow reduction kinetics and multiple competing reactions. Here, we report a catalyst featuring copper nitride (CuN) anchored on a novel graphdiyne support (termed CuN/GDY), which is used for electrocatalytic reduction of nitrate to produce ammonia. The GDY absorbed hydrogen and enabled nitrogen (N) vacancy formation in CuN for the fast nitrate reduction reaction (NORR).

Lattice Strain and Mott-Schottky Effect of the Charge-Asymmetry PdFe Single-Atom Alloy Catalyst for Semi-Hydrogenation of Alkynes with High Efficiency.

The ideal interface design between the metal and substrate is crucial in determining the overall performance of the alkyne semihydrogenation reaction. Single-atom alloys (SAAs) with isolated dispersed active centers are ideal media for the study of reaction effects. Herein, a charge-asymmetry "armor" SAA (named PdFe SAA@PC), which consists of a PdFe alloy core and a semiconducting P-doped C (PC) shell, is rationally designed as an ideal catalyst for the selective hydrogenation of alkynes with high efficiency.

Clinical application of high-resolution spiral CT scanning in the diagnosis of auriculotemporal and ossicle.

Precision and intelligence in evaluating the complexities of middle ear structures are required to diagnose auriculotemporal and ossicle-related diseases within otolaryngology. Due to the complexity of the anatomical details and the varied etiologies of illnesses such as trauma, chronic otitis media, and congenital anomalies, traditional diagnostic procedures may not yield accurate diagnoses. This research intends to enhance the diagnosis of diseases of the auriculotemporal region and ossicles by combining High-Resolution Spiral Computed Tomography (HRSCT) scanning with Deep Learning Techniques (DLT).

Overcoming Electrostatic Interaction via Pulsed Electroreduction for Boosting the Electrocatalytic Urea Synthesis.

Electrocatalytic urea synthesis under ambient conditions offers a promising alternative strategy to the traditional energy-intensive urea industry protocol. Limited by the electrostatic interaction, the reduction reaction of anions at the cathode in the electrocatalytic system is not easily achievable. Here, we propose a novel strategy to overcome electrostatic interaction via pulsed electroreduction.

Atomic Pt Sites Anchored in the Interface between Grains on Vacancy-Enriched CeO Nanosheets: One-Step Precursor Combustion Synthesis.

Atomic metal catalysts have unique electronic, structural, and catalytic properties, which are widely used in the field of catalysis. However, designing new simple synthesis methods to fabricate atomic metal catalysts is a challenge in catalytic applications. Herein, a one-step precursor combustion strategy is presented that starts directly from precursors of metal salts, using a spontaneous combustion process convert platinum nitrate to atomic Pt sites.

Effect of Banking Time Intervention on Child-Teacher Relationships and Problem Behaviors in China: A Multiple Baseline Design.

A positive child-teacher relationship is a crucial means of addressing problem behaviors in young children. In recent years, there has been an increase in factors triggering problem behaviors in young children. It is particularly important to employ universally applicable and scientifically effective strategies to improve child behavior.

Current situation and influencing factors of each turnover of kindergarten teachers - a questionnaire survey.

Objective: Frequent teacher turnover may damage the development of teachers and the regular operation of kindergartens. This original research presented kindergarten teachers' first, second, and third turnover rates and occurrence times. This research analyzed the relationship between socio-demographic variables and the varying frequency of kindergarten teacher turnover.

Integrating Host Design and Tailored Electronic Effects of Yolk-Shell Zn-Mn Diatomic Sites for Efficient CO Electroreduction.

Modulating the surface and spatial structure of the host is associated with the reactivity of the active site, and also enhances the mass transfer effect of the CO electroreduction process (CO RR). Herein, we describe the development of two-step ligand etch-pyrolysis to access an asymmetric dual-atomic-site catalyst (DASC) composed of a yolk-shell carbon framework (Zn Mn -SNC) derived from S,N-coordinated Zn-Mn dimers anchored on a metal-organic framework (MOF). In Zn Mn -SNC, the electronic effects of the S/N-Zn-Mn-S/N configuration are tailored by strong interactions between Zn-Mn dual sites and co-coordination with S/N atoms, rendering structural stability and atomic distribution.

Symmetry-Breaking -Block Antimony Single Atoms Trigger N-Bridged Titanium Sites for Electrocatalytic Nitrogen Reduction with High Efficiency.

The electrochemical nitrogen reduction reaction (eNRR) under mild conditions emerges as a promising approach to produce ammonia (NH) compared to the typical Haber-Bosch process. Herein, we design an asymmetrically coordinated -block antimony single-atom catalyst immobilized on nitrogen-doped TiCT (Sb SA/N-TiCT) for eNRR, which exhibits ultrahigh NH yield (108.3 μg h mg) and excellent Faradaic efficiency (41.

Mixed Plastics Wastes Upcycling with High-Stability Single-Atom Ru Catalyst.

Mixed plastic waste treatment has long been a significant challenge due to complex composition and sorting costs. In this study, we have achieved a breakthrough in converting mixed plastic wastes into a single chemical product using our innovative single-atom catalysts for the first time. The single-atom Ru catalyst can convert ∼90% of real mixed plastic wastes into methane products (selectivity >99%).

Four-Color SERS Monitoring of Size-dependent Nanoparticle Delivery in the Same Tumor.

The physicochemical properties of nanoparticles (NPs) significantly influence their deposition at the disease site, ultimately impacting the overall therapeutic efficacy; however, precisely assessing the effects of various factors on NP accumulation within a single cell/tumor tissue is challenging due to the lack of appropriate labeling techniques. Surface-enhanced Raman spectroscopy (SERS) tag is a powerful encoding method that has recently been intensively employed for immunodetection of biomarkers. Herein, we introduce a multiplexed SERS tracking approach for systematic investigation of size-dependent accumulation and distribution of NPs within the same tumor.

Polystyrene Waste Thermochemical Hydrogenation to Ethylbenzene by a N-Bridged Co, Ni Dual-Atom Catalyst.

Recycling waste plastics requires the degradation of plastics into small molecules. However, various products are widely distributed using traditional methods of depolymerizing polystyrene (PS) such as catalytic pyrolysis and hydrogenolysis. Here, we creatively report a N-bridged Co, Ni dual-atom (Co-N-Ni) catalyst for the targeted conversion of waste PS plastics to ethylbenzene via a pressurized tandem fixed-bed reactor where hydropyrolysis is coupled with downstream vapor-phase hydrotreatment.

Enhancing Photocatalytic-Transfer Semi-Hydrogenation of Alkynes Over Pd/C N Through Dual Regulation of Nitrogen Defects and the Mott-Schottky Effect.

The selective hydrogenation of alkynes is an important reaction; however, the catalytic activity and selectivity in this reaction are generally conflicting. In this study, ultrafine Pd nanoparticles (NPs) loaded on a graphite-like C N structure with nitrogen defects (Pd/DCN) are synthesized. The resulting Pd/DCN exhibits excellent photocatalytic performance in the transfer hydrogenation of alkynes with ammonia borane.

Electron-rich Au nanocrystals/CoO interface for enhanced electrochemical nitrate reduction into ammonia.

Solar-driven electrochemical NO reduction reaction (NORR) is a clean and sustainable strategy that can convert pollutant NO in wastewater to value-added NH. In recent years, cobalt oxides-based catalysts have shown their intrinsic catalytic properties toward NORR but still have room for improvement through catalyst design. Coupling metal oxides with noble metal has been demonstrated to improve electrochemical catalytic efficiency.