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Metal complex catalysts broaden bioorthogonal reactions

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Science china chemistry 2024年第2期67卷 428-449页

作者： Hanjie Zhang Xiaoyu Qin Junping Wang Li ma Tianfeng chen Department of chemistry Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou510632China

Bioorthogonal reactions involving transition metals have diversified applications in imaging,drug development,chemical catalysis and other *** metals used to catalyze the bioorthogonal reaction mainly include ruthenium,palladium,copper,and ***,the great potential for translational applications of bioorthogonal reaction needs to be further expanded and their reaction efficiency should be ***,it is an urgent need for the development of this field to find more suitable catalysts to efficiently catalyze existing biological orthogonal reactions and expand the types of biological orthogonal ***,this review not only summarizes those transition metal complexes-based catalysts participating in bioorthogonal reaction and some bioorthogonal reactions involving transition metals inside the cells,but also sheds light into the discovery of new transition metal complexes and their future development in applications.

关键词： transition metal complexes bioorthogonal reactions biological applications

Flag Varieties of Type B/c and Twisted Yangian

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Algebra colloquium 2024年第1期31卷 129-148页

作者： Zhijie Dong Haitao ma Institute for Advanced Study in mathematics of HIT Harbin Institute of Technology Harbin 150001China college of mathematical Science Harbin Engineering University Harbin 150001China

We study the convolution algebra H_(*)^(G×c^(*))(Z)of G×c^(*)-equivariant homology group on the Steinberg variety of type B/c and define an algebra Y that maps to H_(*)^(G×c^(*))(Z).We also study the G-equivariant ... 详细信息

关键词： Yangian fag variety convolution algebra

clean production of lactic acid by selective carbon-carbon bond cleavage of biomass feedstock over a novel carbon-bismuth oxychloride photocatalyst

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Frontiers of chemical Science and Engineering 2024年第2期18卷 69-81页

作者： Zulfiqar Ali Jiliang ma Dongnv Jin Rui cui Runcang Sun Liaoning Key Lab of Lignocellulose chemistry and Biomaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefineryCollege of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

The use of functional materials such as carbon-bismuth oxyhalides in integrated photorefineries for the clean production of fine chemicals requires restructuring.A facile biomass-assisted solvothermal fabrication of carbon/bismuth oxychloride nanocomposites(c/BiOcl)was achieved at various *** with BiOcl and c/BiOcl-120,c/BiOcl-180 exhibited higher crystallinity,wider visible light absorption,and a faster migration/separation rate of photoinduced *** the selective c–c bond cleavage of biomass-based feedstocks photocatalyzed by c/BiOcl-180,the xylose conversion and lactic acid yield were 100%and 92.5%,respectively.c/BiOcl-180 efficiently converted different biomass-based monosaccharides to lactic acid,and the efficiency of pentoses was higher than that of ***,lactic acid synthesis was favored by all active radicals including superoxide ion(·O_(2)^(−)),holes(h^(+)),hydroxyl radical(·OH),and singlet oxygen(^(1)O_(2)),with·O_(2)^(−)playing a key *** fabricated photocatalyst was stable,economical,and *** use of biomass-derived monosaccharides for the clean production of lactic acid via the c/BiOcl-180 photocatalyst has opened new research horizons for the investigation and application of c–c bond cleavage in biomass-based feedstocks.

关键词： carbon-carbon bond cleavage biomass reforming c/BiOcl lactic acid photocatalysis

Solvent-free carbon sphere nanofluids towards intelligent lubrication regulation

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Friction 2024年第1期12卷 95-109页

作者： Sheng ZHANG Wen LI Xiaoliang ma Xiaoqiang FAN Minhao ZHU Tribology Research Institute School of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China Key Laboratory of Advanced Technologies of materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

By simply switching the electrical circuit installed on steel/steel contact,the tribological behaviors of nanofluids(NFs)can be regulated in real time,thereby achieving the desired performance of friction reduction and wear ***,solvent-free carbon spherical nanofluids(c-NFs)were successfully prepared for intelligent lubrication regulation.c-NFs with excellent lubrication performance can immediately reduce the coefficient of friction(cOF)despite applying a weak electric potential(1.5 V).Moreover,polyethylene glycol 400(PEG400)containing 5.0 wt%c-NFs remained responsive to electrical stimulation under the intermittent voltage application with an average coefficient of friction(AcOF)reduction of 20.8%over *** intelligent lubrication regulation of c-NFs under an external electric field(EEF)mainly depends on the orderly arranged double-electric adsorption film of ion canopy-adsorbed carbon spheres(cSs).The intermittent electrical application can continuously reinforce the adsorption film and its durability for real-time controlling the sliding ***-stimulation-responsive intelligent lubricants provide a new technical support for realizing intelligent stepless control of devices.

关键词： solvent-free carbon spherical nanofluids(c-NFs) intelligent lubrication regulation lubrication performance adsorption film

Exploring the molecular mechanisms and potential therapeutic strategies of ferroptosis in ovarian cancer

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BIOcELL 2024年第3期48卷 379-386页

作者： LISHA ma WANQI SHAO WEILI ZHU Department of Gynecology Jiaxing University Master Degree Cultivation BaseZhejiang Chinese Medical UniversityJiaxingChina Department of Gynecology Jiaxing University Affiliated Women and Children’s HospitalJiaxingChina

The morbidity rate of ovarian cancer,a malignant tumour in gynaecological tumours,is rising,and it is considered to be the most lethal *** majority of patients are typically diagnosed during the advanced stages of the illness due to the elusive characteristics of ovarian cancer and an absence of highly sensitive and speciﬁc diagnostic *** excision of the lesions,along with chemotherapy,is the conventional treatment for ovarian cancer;however,resistance to platinum-based chemotherapeutic drugs and molecular targeted therapies frequently *** the survival rate and prognosis of patients with end-stage or recurring ovarian cancer requires the identiﬁcation of new therapeutic targets due to the absence of efﬁcient medications,and this has emerged as a highly demanding *** have demonstrated that ferroptosis effectively hinders the proliferation of ovarian cancer and induces the demise of malignant *** is composed of the cystine/glutamate antiporter system(the system Xc-)and glutathione peroxidase 4(GPX4).Solute carrier family 7 member 11(SLc7A11)and solute carrier family 3 member 2(SLc3A2)play crucial roles in the regulation of ferroptosis by facilitating the uptake of cystine into cells and the efﬂux of glutamate out of cells,*** cells,GPX4 is the exclusive enzyme employed for reducing liposomal peroxide through glutathione peroxidase *** occurrence of ferroptosis in ovarian cancer is strongly associated with three main pathways,namely,the GPX4-glutathione(GSH)protective pathway,the ferroptosis suppressor protein 1(FSP1)-coenzyme Q10(coQ10)protective pathway,and the guanosine 5'-triphosphate cyclohydrolase I(GcH1)protective *** ovarian cancer cells,the postsynaptic density-95,discs-large,zona occludens 1(PDZ)-binding motif-angiopoietin-like 4-nicotinamide adenine dinucleotide phosphate oxidases 2(TAZ-ANGPTL4-NOX2)pathway can be regulated by Yes-associated protein(YAP)/TAZ,a downstream

关键词： Ovarian cancer Ferroptosis Therapy

Learning Vector Quantization-Based Fuzzy Rules Oversampling Method

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computers, materials & continua 2024年第6期79卷 5067-5082页

作者： Jiqiang chen Ranran Han Dongqing Zhang Litao ma School of mathematics and Physics Hebei University of EngineeringHandan056038China

Imbalanced datasets are common in practical applications,and oversampling methods using fuzzy rules have been shown to enhance the classification performance of imbalanced data by taking into account the relationship between data ***,the creation of fuzzy rules typically depends on expert knowledge,which may not fully leverage the label information in training data and may be *** address this issue,a novel fuzzy rule oversampling approach is developed based on the learning vector quantization(LVQ)*** this method,the label information of the training data is utilized to determine the antecedent part of If-Then fuzzy rules by dynamically dividing attribute intervals using ***,fuzzy rules are generated and adjusted to calculate rule *** number of new samples to be synthesized for each rule is then computed,and samples from the minority class are synthesized based on the newly generated fuzzy *** results in the establishment of a fuzzy rule oversampling method based on *** evaluate the effectiveness of this method,comparative experiments are conducted on 12 publicly available imbalance datasets with five other sampling techniques in combination with the support function *** experimental results demonstrate that the proposed method can significantly enhance the classification algorithm across seven performance indicators,including a boost of 2.15%to 12.34%in Accuracy,6.11%to 27.06%in G-mean,and 4.69%to 18.78%in *** show that the proposed method is capable of more efficiently improving the classification performance of imbalanced data.

关键词： Oversampling fuzzy rules learning vector quantization imbalanced data support function machine

control of aluminum distribution in ZSM-5 zeolite for enhancement of its catalytic performance for propane aromatization

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Frontiers of chemical Science and Engineering 2024年第8期18卷 15-24页

作者： Zhao ma Dezhi Shi Sen Wang Mei Dong Weibin Fan State Key Laboratory of coal conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China University of chinese Academy of Sciences Beijing 100049China

Regulation of aluminum distribution in zeolite framework is an effective method for improving its catalytic performance for propane ***,we found that recrystallization and post-realuminization of ZSM-5 cannot only create hollow structures to enhance the diffusion ability,but also adjust the content and position of paired aluminum species in its *** characterizations results confirmed that increase of paired aluminum content and inducement of more aluminum atoms sited in the intersection cavity are beneficial to the formation of aromatic products in propane *** a result,the hollow-structured ZSM-5 zeolite with more paired aluminum(H-200-hollow)showed higher propane conversion and aromatics selectivity than other samples at the same *** catalytic performance of H-200-hollow can be further improved by ion-exchanging with a small amount of Ga(III)*** propane conversion and aromatics selectivity of Ga-200-hollow reached as high as 95%and 70%,respectively,at 540°c and 1 atm.

关键词： propane aromatization zeolite aluminum distribution recrystallization and post-realuminization

Layerwise third-order shear deformation theory with transverse shear stress continuity for piezolaminated plates

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cHINESE JOURNAL OF AERONAUTIcS 2024年第9期37卷 490-505页

作者： Gao, Yingshan Zhang, Shunqi Hu, Wei ma, Songyun markert, Bernd Shanghai Univ Sch Mech Engn & Automat Shanghai 200444 Peoples R China Shanghai Univ Key Lab Silicate Cultural Rel Conservat Minist Educ Shanghai 200444 Peoples R China Rhein Westfal TH Aachen Inst Gen Mech D-52062 Aachen Germany

Regarding laminated structures, an electromechanically coupled Finite Element (FE) model based on Layerwise Third-Order Shear Deformation (LW-TOSD) theory is proposed for static and dynamic analysis. LW-TOSD ensures the continuity of in-plane displacements and transverse shear stresses. The current LW-TOSD can be applied to arbitrary multi-layer laminated structures with only seven Degrees of Freedom (DOFs) for each element node and eliminates the use of the shear correction factors. Moreover, a shear penalty stiffness matrix is constructed to satisfy artificial constraints to optimize the structural shear strain. A dynamic finite element model is obtained based on LW-TOSD using the Hamilton's principle. First, the accuracy of the current model is validated by comparing with literature and ABAQUS results. Then, this study carries out numerical investigations of piezolaminated structures for different width-to-thickness ratios, length-to-width ratios, penalty stiffness matrix, boundary conditions, electric fields and dynamics. (c) 2024 Production and hosting by Elsevier Ltd. on behalf of chinese Society of Aeronautics and Astronautics.

关键词： Laminated structures Piezolaminated structures Third-order shear deforma- tion theory Shear stress continuity Electromechanically coupled LAMINATED cOMPOSITE FREE-VIBRATION SANDWIcH PLATES

Achieving exceptionally high strength and rapid degradation rate of Mg-Er-Ni alloy by strengthening with lamellar γ' and bulk LPSO phases

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Journal of materials Science & Technology 2024年第1期168卷 88-102页

作者： chaoneng Dai Jingfeng Wang Yuanlang Pan Kai ma Yinhong Peng Ye Wang Danqian Wang chunhua Ran Jinxing Wang Yanlong ma college of chemistry and chemical Engineering Chongqing UniversityChongqing 401331China college of materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research center for magnesium Alloys Chongqing 400044China college of materials Science and Engineering Chongqing University of TechnologyChongqing 400054China

As-extruded Mg-Er-Ni alloys with different volume fractions of long-period stacking ordered(LPSO)phase and density of lamellar γ' phase were prepared,and the microstructure,mechanical,and degradation properties were *** the bulk LPSO phase and the lamellar γ' phase,and controlling the dynamic recrystallization processes during deformation by adjusting the volume fraction of LPSO and the density of the γ' phase,a synergistic increase in strength and degradation rate can be *** the one hand,the increase in corrosion rate was related to the increased volume fraction of the bulk LPSO phase and the densities of the lamellar γ' phase,which provide more galvanic ***,high densities of the lamellar γ' phase can provide more corrosion interface by inhibiting the recrystallization process to refine dynamic recrystallized(DRXed)grains during the hot *** the other hand,the ultimate tensile strength(UTS)and tensile yield strength(TYS)of the Mg-Er-Ni alloy increased from 345 and 265 MPa to 514 MPa and 358 MPa,respectively,which was mainly attributed to grain boundary and texture strengthening,bulk LPSO phase and lamellar γ' phase ***,Mg^(-1)4Er-4Ni alloy,which contains the highest volume fraction bulk LPSO phase and the densities of lamellar γ' phase,re-alized a synergistic enhancement of strength and degradation *** UTS,TYS,and degradation rate of Mg^(-1)4Er-4Ni were 514 MPa,358 MPa,and 142.5 mg cm^(-2)h^(-1)(3 wt%Kcl solution at 93◦c),*** research provides new insight into developing Mg alloys with high strength and degradation rates for fracturing tool materials in the application of oil and gas exploitation in harsh environments.

关键词： Mg-Er-Ni alloy Lamellarγ'and bulk LPSO phases Rapid degradation rate High strength Mechanical and corrosion mechanism