Magnetic Order Transition of a Two-Dimensional Square-Lattice Electrocatalyst Assembled by Fe-N Units: Crucial Role on Oxygen Reduction.

Herein, we theoretically investigate the effect of magnetic orders on electrocatalytic oxygen reduction reaction (ORR) properties on the Fe-N site-embedded two-dimensional (2D) covalent organic framework (Fe-N@COF-CN) under realistic environments. The Fe-N@COF-CN shows a 2D square-lattice (sql) topology with three magnetic order states: one ferromagnetic state (FM) and two antiferromagnetic states (AFM1 and AFM2). Specially, the electrocatalyst in the AFM2 state shows a remarkable onset potential of 0.

Correlation of the spin state and catalytic property of M-N single-atom catalysts in oxygen reduction reactions.

The rational design of high-performance catalysts for oxygen reduction reactions (ORRs) is of great importance for large-scale applications in the field of proton-exchange membrane fuel cells and the green synthesis of HO. The effect of spin states of paramagnetic metal ions on the selectivity of ORRs is significant for single-atom catalysts (SACs). In this work, spin-polarization density functional theory (DFT) calculations, we systematically investigated the popular paramagnetic metal-nitrogen graphene (M-N-C, M = Mn, Fe, and Co) SACs to mainly focus on the correlation of spin states and catalytic performance ( activity and selectivity).

Rational design of bimetallic MXene solid solution with High-Performance electrocatalytic N reduction.

Electrocatalytic N reduction reaction (eNRR) was an effective alternative method for green synthesis of NH. By combining the first-principal Density functional theory (DFT) calculations and Monte Carlo (MC) simulation, we systematacially investigated 24 types equal-ratio bimetallic MXene solid solution, involving 88 different catalysts. Our focus was on the catalytic performance of these materials in eNRR.

Elimination-Fusion Self-Assembly of a Nanometer-Scale 72-Nucleus Silver Cluster Caging a Pair of [EuW O ] Polyoxometalates.

The largest known polyoxometalate (POM)-templated silver-alkynyl cluster, [(EuW O ) @Ag (tBuC≡C) Cl ⋅4 BF ] (SD/Ag20), was isolated under solvothermal conditions and structurally characterized. It was confirmed by single-crystal X-ray diffraction (SCXRD) as a {EuW } -in-{Ag } clusters-in-cluster rod-like compound. The high-resolution electrospray ionization mass spectrometry (HR-ESI-MS) shows that such a double anion-templated cluster is assembled from a crucial single anion-templated Ag intermediate in the solution.

The ionothermal synthesis, structure, and magnetism-structure relationship of two biphenyl tetracarboxylic acid-based metal-organic frameworks.

Two new metal-organic frameworks (1-2) were ionothermally obtained by the reaction of a biphenyltetracarboxylic sodium (Na4BPTC) ligand and M(OOCCH3)2 (M = Co(1) and Mn(2)). Crystal structure analysis reveals that 1 is a Co3Na6 unit-based three dimensional heterometallic MOF, while 2 exhibits a {Mn(COO)n} chain-based three-dimensional framework. Furthermore, the magnetic measurement shows that both of them have anti-ferromagnetic properties.

A novel La(III)-based metal-organic framework (MOF) with a new topology: poly[diaquabis(μ5-2,5-dioxopiperazine-1,4-diacetato)(μ2-oxalato)dilanthanum(III)].

In the title metal-organic framework (MOF), [La(C(8)H(8)N(2)O(6))(C(2)O(4))(0.5)(H(2)O)](n), the La(III) cation is coordinated by eight O atoms in a square antiprismatic configuration. Each La(III) cation is connected to adjacent La(III) cations by bridging 2,5-dioxopiperazine-1,4-diacetate (PODC(2-)) and oxalate (lying about an inversion centre) ligands, generating two-dimensional grid layers.

Production of bioactive exopolysaccharides from bitter medicinal mushroom, Antrodia camphorata (M. Zang et C.H. Su) Sh.H. Wu et al. (Aphyllophoromycetideae) in submerged cultivation.

This study examines the effects of various fructose concentrations in media on the production and quality of bioactive exopolysaccharides (EPS) from Bitter medicinal mushroom, Antrodia camphorata in submerged cultures. The fructose in media of submerged cultures of A. camphorata significantly affected the production, average molecular weight (Mn), and antioxidant activity of exopolysaccharides.

Temperature-dependent conductivity of Emim+ (Emim+ = 1-ethyl-3-methyl imidazolium) confined in channels of a metal-organic framework.

A 3D metal-organic framework, featuring three kinds of cation channels, was obtained through an ionothermal reaction. Investigation on its temperature-dependent conductivity indicates the contribution of order and disorder of the Emim(+) (Emim(+) = 1-ethyl-3-methyl imidazolium bromide) in the channel to its conductivity.

Magnetic and thermal properties of three ionothermally synthesized metal-carboxylate frameworks of [M3(ip)4][EMIm]2 (M = Co, Ni, Mn, H2ip = isophthalic acid, EMIm = 1-ethyl-3-methyl imidazolium).

Three metal-organic frameworks, [M(3)(ip)(4)][EMIm](2) (M = Co 1, Ni 2, Mn 3, H(2)ip = isophthalic acid, EMIm = 1-ethyl-3-methyl imidazolium) were prepared from an ionic liquid medium. All the compounds feature the same (4(24))(6(4)) topology based on linear trinuclear clusters as eight-connected nodes. Compounds 1 and 2 are isostructural, while compound 3 exhibits a different structure due to the slight difference in the arrangement of M(3)(OOCR)(8) SBUs.

Two three-dimensional 2p-3d-4f heterometallic frameworks featuring a Ln6Cu24Na12 cluster as a node.

Two three-dimensional 2p-3d-4f heterometallic frameworks featuring a nanosized Ln(6)Cu(24)Na(12) (Ln = Gd, Dy) cluster as a node have been obtained under microwave irradiation conditions through the reaction of H(2)ANMA (H(2)ANMA = L-alanine-N-monoacetic acid), Cu(NO(3))(2), and Ln(NO(3))(3) (Ln = Gd for 1, Dy for 2) with NaOH in deionized water. Investigations on the magnetic properties show that 1 exhibits ferrimagnetic behavior. The electrical conductivity measurements reveal that 1 behaves as a proton conductor.

[Historical succour of poverty and medical assistance in rural China.].

There was considerable attention paid to the succour of poverty with widespread practice in China's history. Succour of poverty and medical assistance in rural areas were closely connected with famine relief carried out by the rulers. The mutual assistance of emotional and moral support long-term in rural communities is the most important form of medical assistance.

[A preliminary study on the preparation of perfusion-decellularized laryngeal scaffold and the feasibility of laryngeal muscle reconstruction].

Objective: To prepare a decellularized whole laryngeal scaffold by utilizing a perfusion-decellularized technique, reseed cells on it, and construct decellularized laryngeal muscles.

Methods: Perfusion decellularized larynxes were obtained by common carotid arterious perfusion with detergents. Then they were performed by macroscopic view, histological examination, scanning electron microscopy (SEM) and cartilage viability.

[An eight-year study on maternal and child health service utility in Sichuan province].

Objective: To evaluate the effect of intervention on factors influencing the health service utility regarding Maternal and Child Health (MCH) under the 'Qinba Health Project' in Sichuan province.

Methods: 15 towns in 5 programmed counties were selected, using the method of 'random layer sampling' to be the trial group. With similar MCH status and comparable to the trial group, another 9 towns in 3 non-programmed counties were chosen as the control group, using the same sampling method.

[Experience of diagnosis and treatment for cervical tracheoesophageal fistula complicated with laryngotracheal stenosis].

Objective: To explore the treatment of cervical tracheoesophageal fistula (TEF) with complicated or remnant laryngotracheal stenosis (LTS) and anterior neck defect (AND).

Methods: From 1980 to 2007, 14 patients were diagnosed as TEF. Among them, 9 patients had complicated or remnant LTS, 3 patients had complicated AND, and 2 patients had TEF which were induced by Nickel-Titanium alloy mesh stent for treating benign esophageal stricture.

[An evaluation of the maternal and child health services in Qinba Health Project in Sichuan province].

Objectives: To evaluate the effectiveness of interventions taken by Qinba Health Project on the Maternal and Child Health (MCH) services in Sichuan province.

Methods: Stratified random sampling was undertaken to select participants for the evaluation. Eighty one villages in 27 towns in the nine project counties and 27 villages in nine towns in three non-project counties with similar social economic backgrounds were selected.

[Anteroposterior cricoid split interposition grafting for severe glottic and subglottic stenosis].

Objective: To study the effect of anterior and posterior cricoid splitting interposition grafting for severe glottic and subglottic stenosis.

Methods: This is a retrospective study, from 1991 to 2001 years, 25 patients (male 15, female 10, aged 9 to 46 years) with severe glottic and subglottic stenosis were operated with anterior and posterior cricoid splitting interposition grafting method at Tangdu Hospital. All of 25 patients were tracheostomy dependent before reconstruction.

[Experimental research using human bone marrow mesenchymal stem cells as the seed cells for bone and cartilage tissue engineering].

Aim: To investigate the feasibility of human bone marrow mesenchymal stem cells(hMSCs) as the seed cells for bone and cartilage tissue engineering.

Methods: Purified hMSCs were cultured in-vitro and induced to differentiate into osteoblasts and chondrocytes. Cellular morphologies were observed under inverted and electron microscopes.

[In vivo chondrogenesis of induced human marrow mesenchymal stem cells in nude mice].

Objective: To investigate the feasibility of generating cartilage tissues from human bone marrow mesenchymal stem cells (MSCs) cultured and induced in vitro using tissue engineering technique.

Methods: Human bone marrow MSCs were isolated from the ribs of patients receiving chest surgeries and induced into cartilage cells in serum culture-free medium. The cells were then seeded on perchloroethylene (PCE) as the scaffold material for the formation of cell-PCE composite, which was implanted under the dorsal skin of nude mice.

Therapeutic effects of eustachian tube surfactant in barotitis media in guinea pigs.

Background: Previous research has shown that the eustachian tube (ET) in animals and humans is lined with a substance that lowers surface tension and thus facilitates the opening of the eustachian tube and aeration of the middle ear. The aims of the present study were to observe the role of eustachian tube surfactant (ETS) on the opening of the ET and to explore the therapeutic effect of natural and artificial ETS on barotitis media (BOM).

Methods: BOM was successfully established in 50 guinea pigs by simulated ascent in an altitude chamber.

Long-term results of the sternohyoid myocutaneous rotary door flap for laryngotracheal reconstruction.

In the past 8 years, 45 patients with laryngotracheal stenosis have undergone reconstruction with the sternohyoid myocutaneous rotary door flap (RDF) technique at Tang Du Teaching Hospital in Xi'an, China. All patients were tracheostomy-dependent before reconstruction. Thirty-six patients had previously undergone 2 to 7 surgical procedures.