Insight into the Mechanism of CO Chemical Fixation into Epoxides by Windmill-Shaped Polyoxovanadate and -BuNX (X = Br, I).

Carbon dioxide (CO) coupled with epoxide to generate cyclic carbonate stands out in carbon neutrality due to its 100% atom utilization. In this work, the mechanism of CO cycloaddition with propylene oxide (PO) cocatalyzed by windmill-shaped polyoxovanadate, [(CNH)(CHO)VVO]·4CHOH (V-1), and -BuNX (X = Br, I) was thoroughly investigated using density functional theory (DFT) calculations. The ring-opening, CO-insertion, and ring-closing steps of the process were extensively studied.

Insights into the Mechanism of Nitrobenzene Reduction to Aniline by Phosphomolybdic Acid Supported TM Single-Atom Catalysts.

Catalytic hydrogenation of nitrobenzene (Ph-NO) to aniline (Ph-NH) is a model reaction in the field of catalysis, in which the development of efficient catalysts remains a great challenge due to the lack of strategies to solve activity and selectivity problems. In this work, the mechanism of Ph-NO hydrogenation over Pt supported on phosphomolybdic acid (α-PMA) was proposed by density functional theory (DFT) calculations. The results show that the dissociation of the first and second N-O bonds is triggered by single H-induced and double H-induced mechanisms, respectively.

Release of dissolved organic matter from wetland plants and its interaction with polycyclic aromatic hydrocarbons.

Dissolved organic matter (DOM) derived from wetland plants played a critical role in CWs pollutant migration. This study investigated the character and release pattern of DOM derived from two wetland plants, Phragmites australis and Cladophora sp., and the interaction between DOM with phenanthrene (PHE), benzo(a)pyrene (Bap), and benzo [k]fluoranthene (BkF) under different physical conditions were also studied using spectroscopic techniques.

Regulating Efficient and Selective Single-atom Catalysts for Electrocatalytic CO Reduction.

Anchoring transition metal (TM) atoms on suitable substrates to form single-atom catalysts (SACs) is a novel approach to constructing electrocatalysts. Graphdiyne with sp-sp hybridized carbon atoms and uniformly distributed pores have been considered as a potential carbon material for supporting metal atoms in a variety of catalytic processes. Herein, density functional theory (DFT) calculations were performed to study the single TM atom anchoring on graphdiyne (TM -GDY, TM=Sc, Ti, V, Cr, Mn, Co and Cu) as the catalysts for CO reduction.

Efficacy and safety of methylene blue in patients with vasodilatory shock: A systematic review and meta-analysis.

Background: The role of methylene blue (MB) in patients with vasodilatory shock is unclear. The purpose of this systematic review and meta-analysis was to evaluate the efficacy and safety of MB in patients with vasodilatory shock.

Methods: We searched MEDLINE at PubMed, Embase, Web of Science, Cochrane, CNKI, CBM and Wanfang Medical databases for all observational and intervention studies comparing the effect of MB vs.

Vancomycin dosing in an obese patient with acute renal failure: A case report and review of literature.

Background: Vancomycin is the most commonly used drug for methicillin-resistant . The empirical clinical doses of vancomycin based on non-obese patients may not be optimal for obese ones.

Case Summary: This study reports a case of vancomycin dosing adjustment in an obese patient (body mass index 78.

Effect of goal-directed fluid therapy on renal function in critically ill patients: a systematic review and meta-analysis.

Objective: To evaluate whether goal-directed fluid therapy (GDFT) reduces the risk of renal injury in critical illness.

Methods: MEDLINE PubMed, EMBASE, CENTRAL and CBM was searched from inception to 13 March 2022, for studies comparing the effect of GDFT with usual care on renal function in critically ill patients. GDFT was defined as a protocolized intervention based on hemodynamic and/or oxygen delivery parameters.

Afterload-related cardiac performance predicts prognosis in critical ill patients with sepsis: A prospective observational pilot study.

To investigate the usefulness of afterload-related cardiac performance (ACP) for assessing cardiac impairment and predicting prognosis in septic patients.Adult patients with sepsis in the intensive care unit were included. Cardiac output, cardiac index, cardiac power index, and ACP were calculated at the time of admission (D0) and 48-72 h after admission (D3).

Influence of Powder Bed Temperature on the Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated via Laser Powder Bed Fusion.

Laser powder bed fusion (LPBF) is being increasingly used in the fabrication of complex-shaped structure parts with high precision. It is easy to form martensitic microstructure in Ti-6Al-4V alloy during manufacturing. Pre-heating the powder bed can enhance the thermal field produced by cyclic laser heating during LPBF, which can tailor the microstructure and further improve the mechanical properties.

Transition-Metal-Modified Vanadoborate Clusters as Stable and Efficient Photocatalysts for CO Reduction.

Photocatalytic carbon dioxide reduction (CORR) is considered to be a promising sustainable and clean approach to solve environmental issues. Polyoxometalates (POMs), with advantages in fast, reversible, and stepwise multiple-electron transfer without changing their structures, have been promising catalysts in various redox reactions. However, their performance is often restricted by poor thermal or chemical stability.

Safety evaluation and ibuprofen removal via an Alternanthera philoxeroides-based biochar.

Pharmaceutical and personal care products (PPCPs) are a representative class of emerging contaminants. This study aimed to investigate the PPCP removal performance and application safety of a biochar fabricated using the invasive plant Alternanthera philoxeroides (APBC). According to scanning electron microscopy and pore size analyses, APBC exhibited a porous structure with a specific surface area of 857.

Changes in electricity production and microbial community evolution in constructed wetland-microbial fuel cell exposed to wastewater containing Pb(II).

Two constructed wetland microbial fuel cell (CW-MFC) devices, experimental group (EG, with 5 mg/L Pb(II) addition) and control group (CG) were built to explore the changes in power generation, wastewater purification and microbial community structure under Pb(II) stress. The voltage of EG (343.16 ± 12.

Peroxisome proliferator-activated receptor gamma participates in the acquisition of brain ischemic tolerance induced by ischemic preconditioning via glial glutamate transporter 1 in vivo and in vitro.

Glial glutamate transporter 1 (GLT-1) plays a vital role in the induction of brain ischemic tolerance (BIT) by ischemic preconditioning (IPC). However, the mechanism still needs to be further explained. The aim of this study was to investigate whether peroxisome proliferator-activated receptor gamma (PPARγ) participates in regulating GLT-1 during the acquisition of BIT induced by IPC.

The mechanism of GLT-1 mediating cerebral ischemic injury depends on the activation of p38 MAPK.

The previous studies have shown that glial glutamate transporter-1 (GLT-1) participates in cerebral ischemic injury in rats. However, the mechanism involved remains to be elucidated. This study was undertaken to investigate whether p38 MAPK was involved in regulating GLT-1 in the process.

[Influence of time of initiation of continuous renal replacement therapy on prognosis of critically ill patients with acute kidney injury].

Objective: To investigate the influence of the time of initiation of continuous renal replacement therapy (CRRT) on the survival and recovery of renal function in survivors of critically ill patients with acute kidney injury (AKI).

Methods: A retrospective analysis was performed on the data of critically ill patients with AKI, who were treated with CRRT from January 1, 2009 to June 30, 2011 in the Fourth Hospital of Hebei Medical University. According to Acute Kidney Injury Net (AKIN) classification at the beginning of CRRT, patients were stratified into AKIN 1, 2, 3 stages.