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Core-shell heterostructure engineering of CoP nanowires coupled NiFe LDH nanosheets for highly efficient water/seawater oxidation

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Chinese Chemical Letters 2024年第8期35卷 549-553页

作者： Guo-Hong Gao Run-Ze zhao Ya-Jun Wang Xiao Ma yan li Jian Zhang Ji-Sen li School of Chemistry Chemical Engineering and MaterialsJining UniversityQufu 273155China Institute of Physical Education Jining UniversityQufu 273155China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Searching for efficient nonprecious metal-based catalysts toward oxygen evolution reaction(OER)are of significance for seawater ***,a core-shell-structured hybrid of cobalt phosphide nanowires@NiFe layered double hydroxide nanosheets grown on conductive nickel foam(CoP@NiFe LDH/NF)is prepared by a feasible approach at low *** charming structure can provide numerous phosphide/hydroxide heterogenous interfaces,expose abundant active sites,and boost elec-tron/mass transfer,synergistically enhancing catalytic OER *** employed as an electrocatalyst toward the OER,the resultant CoP@NiFe LDH/NF only requires a small overpotential of 287 mV to pro-vide 300 mA/cm^(2)current density as well as long-time durability in 1.0 mol/L KOH *** regula-tion of electronic states and surface reconstruction synergistically contribute to highly efficient seawater *** work provides an opportunity to construct efficient and inexpensive electrocatalysts for hydrogen production.

关键词： Cobalt phosphide NiFe layered double hydroxide Interfacial engineering Oxygen evolution reaction Seawater oxidation

Fully Nonlinear Equations of Krylov Type on Riemannian Manifolds with Totally Geodesic Boundary

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Acta Mathematica Sinica,English Series 2024年第5期40卷 1293-1307页

作者： li CHEN yan HE Faculty of Mathematics and Statistics Hubei Key Laboratory of Applied MathematicsHubei UniversityWuhan 430000P.R.China

In this paper,we study fully nonlinear equations of Krylov type in conformal geometry on compact smooth Riemannian manifolds with totally geodesic *** prove the a priori estimates for solutions to these equations and ... 详细信息

关键词： The modified Schouten tensor k-convex Hessian type equation

Eco-friendly high-throughput screening of cephalosporins impurities: Utilizing 2D-carbon microfiber fractionation system combined with quadrupole time of flight high-resolution mass spectrometer

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Journal of Pharmaceutical Analysis 2024年第5期14卷 772-774页

作者： Lei yang yan Wang zhao Wang Meiyu Cui Ruolan Jin Hai-Bo Shang Donghao li College of Pharmacy Yanbian UniversityYanjiJilin133002China Department of Chemistry Interdisciplinary Program of Biological Functional MoleculesCollege of Integration ScienceYanbian UniversityYanjiJilin133002China

Owing to its high sensitivity,selectivity,and accuracy,liquid chromatography coupled with mass spectrometry(LC-MS)is commonly employed to screen,confirm,and quantify impurities in drugs[1].However,LC-MS has certain drawbacks such as complicated pretreatment steps,long analysis time,large consumption of organic solvents,high maintenance costs,and,most notably,the need for high-pressure pumps and compatible hardware because of the high column backpressure[2].In this study,a two-dimensional(2D)microscale carbon fiber(CF)/active carbon fiber(ACF)system combined with a quadrupole time-of-flight high-resolution mass spectrometry(2DmCFs-QTOF-HRMS)system was developed to rapid screening impurities in the typical three generations of oral cephalosporins,i.e.,cephalexin tablets(CPXTs),cefuroxime axetil tablets(CFATs),and cefixime tablets(CFXTs)(Fig.S1).The“fuzzy chromatographic separation”sample pretreatment method separates complex samples into high-,medium-,and weak-polar fractions for successive detection of MS,achieving effective reduction of the ion suppression effect in electrospray ionization(ESI)-MS and improving the MS detection *** to high performance liquid chromatography(HPLC)-MS,this method has distinct advantages such as less organic solvent consumption(1.5 mL),shorter separation and analysis times(5 min),more information on impurities,and high reproducibility.

关键词： system carbon tablets

Discovery and Asymmetric Total Synthesis of Phlegmine A as a Selective Inhibitor of ASIC1a

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CCS Chemistry 2024年第10期6卷 2529-2536页

作者： Zai-Feng Yuan Fei liu Yu-Fei Ou Wen-yan li li-yan Peng Xiao-Nian li Qin-Shi zhao State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201 School of Pharmacy Chengdu University of Traditional Chinese MedicineChengdu 611137 University of Chinese Academy of Sciences Beijing 10049

Phlegmine A(1),a novel type of Lycopodium alkaloid with a unique skeleton,was isolated from the rare and endangered herbal medicinal plant,Phlegmariurus *** methods and X-ray diffraction analysis were employed to unambiguously elucidate the structure of phlegmine A(1).Furthermore,we realized the asymmetric total synthesis of the natural product phlegmine A(1)in 18 linear steps from commercial ingredients,achieving a 1.3%overall *** intramolecular carbene cyclization,dimethyldioxirane(DMDO)enamine oxidation,and Stevens rearrangement were exploited to establish the sterically congested vicinal quaternary centers,and an epimerization/aldol condensation/deacetylation reaction was utilized for the rapid assembly of enone at the final *** our semisynthesis attempts,a novel transformation was developed to constructα-aminoketone from enamine ***,the synthetic sample obtained from this work enabled the successful verification of phlegmine A(1)as a new type of highly selective acidsensing ion channel 1a(ASIC1a)inhibitor,which also exerted an in vivo analgesic effect,rendering it a promising lead compound.

关键词： Lycopodium alkaloids phlegmine A total synthesis ASIC1a inhibitor analgesic

Effects of microplastic polystyrene,simulated acid rain and arbuscular mycorrhizal fungi on Trifolium repens growth and soil microbial community composition

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Pedosphere 2024年第2期34卷 424-437页

作者： Wanlin li yan XIAO College of Agro-grassland Science Nanjing Agricultural UniversityNanjing 210095China

Microplastic pollution is a global and ubiquitous environmental problem in the oceans as well as in the terrestrial *** examined the fate of microplastic polystyrene(MPS)beads in experimental soil in the presence and absence of symbiotic arbuscular mycorrhizal fungi(AMF)and simulated acid rain(SAR)to determine whether the combinations of these three factors altered the growth of white clover Trifolium *** found that MPS,SAR,or AMF added singly to soil did not alter *** growth or *** contrast,MPS and AMF together significantly reduced shoot biomass,while SAR and MPS together significantly reduced soil available phosphorus independent of AMF *** polystyrene,AMF,and SAR together significantly reduced soil NO_(3)^(-)-*** mycorrhizal fungi added singly also enriched the beneficial soil bacteria(genus Solirubrobacter),while MPS combined with AMF significantly enriched the potential plant pathogenic fungus *** mycorrhizal fungi inoculation with MPS increased the abundance of soil hydrocarbon degraders independent of the presence of *** addition,the abundance of soil nitrate reducers was increased by MPS,especially in the presence of AMF and ***,SAR alone increased the abundance of soil pathogens within the fungal community including antibiotic *** findings indicate that the coexistence of MPS,SAR,and AMF may exacerbate the adverse effects of MPS on soil and plant health.

关键词： acid deposition arbuscular mycorrhizal fungi symbiosis hydrocarbon degradation microbial alpha diversity microplastic pollution pathogen

Climate and topography regulate the spatial pattern of soil salinization and its effects on shrub community structure in Northwest China

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Journal of Arid Land 2024年第7期16卷 925-942页

作者： DU Lan TIAN Shengchuan zhao Nan ZHANG Bin MU Xiaohan TANG lisong ZHENG Xinjun li yan State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Fukang Station of Desert Ecology Chinese Academy of SciencesFukang 831505China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China

Soil salinization may affect biodiversity and species composition,leading to changes in the plant community ***,few studies have explored the spatial pattern of soil salinization and its effects on shrub community structure at the ecosystem ***,we conducted a transect sampling of desert shrublands in Northwest China during the growing season(June–September)in *** salinization(both the degree and type),shrub community structure(e.g.,shrub density and height),and biodiversity parameters(e.g.,Simpson diversity,Margalf abundance,Shannon-Wiener diversity,and Pielou evenness indices)were used to assess the effects of soil salinization on shrub community *** results showed that the primary degree of soil salinization in the study area was light salinization,with the area proportion of 69.8%.Whereas the main type of soil salinization was characterized as sulfate saline soil,also accounting for 69.8%of the total ***,there was a significant reduction in the degree of soil salinization and a shift in the type of soil salinization from chloride saline soil to sulfate saline soil,with an increase in *** mean annual precipitation(MAP),mean annual evapotranspiration(MAE),elevation,and slope significantly contributed to soil salinization and its geochemical *** soil salinization intensified,shrub community structure displayed increased diversity and evenness,as indicated by the increases in the Simpson diversity,Shannon-Wiener diversity,and Pielou evenness ***,the succulent stems and leaves of Chenopodiaceae and Tamaricaceae exhibited clear advantages under these ***,regional climate and topography,such as MAP,MAE,and elevation,had greater effects on the distribution of shrub plants than soil *** results provide a reference for the origin and pattern of soil salinization in drylands and their effects on the community structure of halophyte shrub species.

关键词： soil salinization halophytes shrubland climate change biodiversity drylands Northwest China

NODULATION TRIO in Medicago truncatula:Unveiling the redundant roles of MtLYK2,MtLYK3,and MtLYK2bis

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Journal of Integrative Plant Biology 2024年第8期66卷 1553-1556页

作者： Yaohua li yanwen zhao Ziang yan Ru Dong Haixiang Yu Hui Zhu yangrong Cao National Key Lab of Agricultural Microbiology Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China

The legume–rhizobial symbiosis is a distinctive model in plant–microbe *** being foreign invaders,rhizobia are acknowledged as“friends”by compatible host plants,leading to mutualistic endosymbiosis(Cao et al.,2017).

关键词： mutual spite redundant

Molecular Epidemiological Study of a Human Brucellosis Outbreak—Weihai City,Shandong Province,China,2022

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China CDC weekly 2024年第12期6卷 230-234页

作者： yan li Yifan Yu Jian zhao Shujun Ding Guoying Zhang Xiaolin Yu Zengqiang Kou Shandong Provincial Center for Disease Control and Prevention Jinan CityShandong ProvinceChina Shandong First Medical University Shandong Academy of Medical SciencesJinan CityShandong ProvinceChina Weihai Municipal Center for Disease Control and Prevention Weihai CityShandong ProvinceChina

What is already known about this topic?Brucellosis,mainly caused by Brucella melitensis(***),is regarded as a significant zoonotic disease in *** Weihai,located at the eastern end of the Shandong Peninsula,brucellosis has been in a low epidemic phase for the past five *** is added by this report?This was the initial report of a brucellosis outbreak in the last five *** of *** bv.3 from Weihai and other cities showed a close genetic relationship,suggesting a potential common *** are the implications for public health practice?Epidemiological investigations depend on standardized and effective molecular typing methods and analysis tools for public health laboratories to identify and trace *** the circulation patterns of livestock in free-range households in heavily affected areas is essential for controlling the spread of brucellosis.

关键词： Shandong China. break

A calibration and compensation method for an industrial robot with high accuracy harmonic reducers

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Science China(Technological Sciences) 2024年第3期67卷 725-739页

作者： zhao Yiyang liU Xun CAO JiaBin liU JinYu XU yan yan WeiXin School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China College of Computer and Control Engineering Northeast Forestry UniversityHarbin 150040China

Industrial serial robots need high stiffness to keep absolute pose accuracy and meet the requirements in practical applications. However, the weak stiffness feature of robot joints and the payloads affected on robot end-effector, which will also increase the pose error of robot. Especially, the existing calibration methods often consider under no-payload condition without discussing the payload state. In this paper, we report a new industrial serial robot composed by a new harmonic reducer: Model-Y, based on high accuracy and high stiffness, and a kinematic parameter calibration algorithm which is based on a harmonic reducer forcedeformation model. To decrease the accuracy effects of payload, an iterative calibration method for kinematic parameters with payload situation was proposed. Simulation and experiments are conducted to verify the effectiveness of the proposed calibration method using the self-developed industrial serial robot. The results show a remarkably improved accuracy in absolute position and orientation with the robot's payload range. The position mean error has 70% decreased to 0.1 mm and the orientation mean error diminished to less than 0.01° after calibration with compensation. Additionally, online linear and circular tests are carried out to evaluate the position error of the robot during large-scale spatial and low-speed continuous movement. The accuracy is consistent with the previous calibration results, indicating the effectiveness and advantages of the proposed strategy in this article.

关键词： industrial serial robot Model-Y harmonic calibration stiffness model online compensation