Two-dimensional (2D)/2D Interface Engineering of a MoS/CN Heterostructure for Promoted Electrocatalytic Nitrogen Fixation.

The electrochemical nitrogen reduction reaction (NRR) is a very efficient method for sustainable NH production, but it requires effective catalysts to expedite the NRR kinetics and inhibit the concomitant hydrogen evolution reaction (HER). Two-dimensional (2D)/2D interface engineering is an effective method to design powerful catalysts due to intimate face-to-face contact of two 2D materials that facilitates the strong interfacial electronic interactions. Herein, we explored a 2D/2D MoS/CN heterostructure as an active and stable NRR catalyst.

Electronically Coupled SnO Quantum Dots and Graphene for Efficient Nitrogen Reduction Reaction.

Electrocatalytic N reduction reaction (NRR) provides an effective and renewable approach for artificial NH production, but still remains a grand challenge because of the low NH yield and Faradaic efficiency (FE). Herein, we reported that the SnO quantum dots (QDs) supported on reduced graphene oxide (RGO) could efficiently and stably catalyze NRR at ambient conditions. The NRR performance of resulting SnO/RGO was studied by both experimental techniques and density functional theory calculations.

Boosted Electrocatalytic N Reduction on Fluorine-Doped SnO Mesoporous Nanosheets.

The development of highly active and durable electrocatalysts toward the N reduction reaction (NRR) holds a key to ambient electrocatalytic NH synthesis. Herein, fluorine (F)-doped SnO mesoporous nanosheets on carbon cloth (F-SnO/CC) were developed as an efficient NRR electrocatalyst. Benefiting from the combined structural advantages of mesoporous nanosheet structure and F-doping, the F-SnO/CC exhibited high NRR activity with an NH yield of 19.

ZnO Quantum Dots Coupled with Graphene toward Electrocatalytic N Reduction: Experimental and DFT Investigations.

Electrochemical reduction of N to NH is a promising method for artificial N fixation, but it requires efficient and robust electrocatalysts to boost the N reduction reaction (NRR). Herein, a combination of experimental measurements and theoretical calculations revealed that a hybrid material in which ZnO quantum dots (QDs) are supported on reduced graphene oxide (ZnO/RGO) is a highly active and stable catalyst for NRR under ambient conditions. Experimentally, ZnO/RGO was confirmed to favor N adsorption due to the largely exposed active sites of ultrafine ZnO QDs.

[Open-wedge high tibial osteotomy and unicomartmental knee arthroplasty in treating medial compartment osteoarthritis of the knee: a Meta analysis].

Objective: To systematic evaluate the outcome of open-wedge high tibial osteotomy(OWHTO) and unicomartmental knee arthroplasty (UKA) in treating medial compartment osteoarthritis of the knee.

Methods: According to the retrieval strategy made by the Cochrane collaboration, a computer-base research of Medline, Pubmed, EMbase, Cochrane Library, CBM, CNKI, and Wanfang databases was performed and search deadline was March 2018. Related Chinese and English orthopedic journals and conference papers were manually searched.

Using 2003-2014 U.S. NHANES data to determine the associations between per- and polyfluoroalkyl substances and cholesterol: Trend and implications.

Exposure to per- and polyfluoroalkyl substances (PFASs) is a major concern due to their widespread occurrence and adverse health outcomes. The possible binding of PFASs to peroxisome proliferator-activated receptors (PPARs) and nuclear receptors raises concerns that PFASs may impact cholesterol levels in human. In this study, the U.

Benchmark dose for cadmium exposure and elevated N-acetyl-β-D-glucosaminidase: a meta-analysis.

Cadmium (Cd) is a well-known nephrotoxic contaminant, and N-acetyl-β-D-glucosaminidase (NAG) is considered to be an early and sensitive marker of tubular dysfunction. The link between Cd exposure and NAG level enables us to derive the benchmark dose (BMD) of Cd. Although several reports have already documented urinary Cd (UCd)-NAG relationships and BMD estimations, high heterogeneities arise due to the sub-populations (age, gender, and ethnicity) and BMD methodologies being employed.

[Ectopic osteogenesis of tissue engineered bone with slow-released bioactive factors].

Objective: To study the ectopic osteogenesis of tissue engineered bone with recombinant human bone morphogenetic protein/transforming growth factor-beta (rhBMP/TGF-beta) or WO-1 slow-released factors.

Methods: Partial demineralized freeze-dried bone (PDFDB) of pig was used as scaffold material. rhBMP/TGF-beta or WO-1 were pre-coated on the surface of material by means of vacuum negative pressure absorption, and then coated with polylactic acid (PLA) to make slow-released material.

[Experimental study of periosteal osteoblasts coculture with freeze-dried demineralized bone matrix].

Objective: To investigate the feasibility of freeze-dried demineralized bone matrix (FDBM) as scaffold material in bone tissue engineering.

Methods: Osteoblasts which were isolated from cranial periosteum of New Zealand rabbits were cultured as the seeding cells, then the cells were cocultured with heterogenous FDBM in vitro. The cell-material complex was observed under phase microscope, light microscope and electronic scanning microscope in order to evaluate the interaction between cells and FDBM.