检索结果-南通市图书馆

Nano Research 2024年第9期17卷 7967-7974页

作者： Weiruo Liu Yanbin Zhu Jiwei Wang Haisong Feng Yunpu Zhai Wei Li dongyuan Zhao College of Chemistry Zhengzhou University100 Kexue AvenueZhengzhou 450001China department of Chemistry Laboratory of Advanced MaterialsShanghai Key Laboratory of Molecular Catalysis and Innovative Materialsand State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433China State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Highly dispersed Pd/N-doped carbon dots(Pd/NCds)were successfully immobilized in the mesoporous channels of amino-functionalized dendritic mesoporous silica nanospheres(NMS).The synthesized Pd/NCds@NMS catalyst exhibits outstanding performance in the catalytic reduction of 4-nitrophenol(4-NP),achieving a turnover frequency of 1461.8 mol·molPd^(-1)·h^(-1),with the conversion rate remaining above 80%after 11 *** and density functional theory calculations reveal that the NCds significantly affect the electronic structure of Pd nanoparticles,leading to changes in the energy barriers for the adsorption of 4-NP at the Pd sites and the conversion of 4-NP reaction intermediates,which is a key factor contributing to the catalytic *** study offers a new strategy for synthesizing carbon-dot-modified metal-based catalysts.

关键词： palladium nanoparticles nitrogen-doped carbon dots dendritic mesoporous silica catalytic hydrogenation 4-nitrophenol reduction

Kinetics and mechanism of propylene hydro-oxidation to acrolein on Au catalysts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第1期17卷 354-363页

作者： Wei du Zhihua Zhang Nan Song Xuezhi duan Xinggui Zhou State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Propylene epoxidation by H_(2)and O_(2)to propylene oxide(PO)over the Au-Ti bifunctional catalysts,as an ideal reaction for PO production,has attracted great *** the mechanism of acrolein formation is of great importance for understanding the mechanism of molecular oxygen activation and the formation of hydroperoxo species on the Au ***,we investigate the reaction mechanism of propylene oxidation to acrolein on the Au/uncalcined TS-1(Au/TS-1-B)catalyst through a combination of multiple characterization,H_(2)/d_(2)exchange,kinetics experiment,and *** Ti sites are found to be non-essential to acrolein ***,the acrolein formation on the Au/TS-1-B catalyst is confirmed to be promoted by H_(2)through hydroperoxo species formation,which includes two main steps:propylene dehydrogenation to*C_(3)H_(5)with the aid of*OOH species,and*C_(3)H_(5)oxidation by*OOH to *** latter step is determined to be the rate-determining step because the corresponding kinetics model gives the best description for experimental *** work not only provides kinetics insights for the propylene hydro-oxidation to acrolein on the Au-Ti bifunctional catalysts,but also facilitates the rational design of Au catalysts with high activity and selectivity in the direct propylene epoxidation with H_(2)and O_(2).

关键词： kinetics mechanism gold acrolein hydro-oxidation

The regulatory mechanism of rapid lignification for timely anther dehiscence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第8期66卷 1788-1800页

作者： Jing-Shi Xue Yi-Feng Feng Ming-Qi Zhang Qin-Lin Xu Ya-Min Xu Jun-Qin Shi Li-Fang Liu Xiao-Feng Wu Shui Wang Zhong-Nan Yang shanghai Key Laboratory of Plant Molecular Sciences College of Life SciencesShanghai Normal UniversityShanghai 200234China National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China University of the Chinese Academy of Sciences Beijing 100049China development Center of Plant Germplasm Resources College of Life SciencesShanghai Normal UniversityShanghai 200234China

Anther dehiscence is a crucial event in plant reproduction,tightly regulated and dependent on the lignification of the anther *** this study,we investigated the rapid lignification process that ensures timely anther dehiscence in *** findings reveal that endothecium lignification can be divided into two distinct *** phase Ⅰ,lignin precursors are synthesized without polymerization,while phase Ⅱ involves simultaneous synthesis of lignin precursors and *** transcription factors MYB26,NST1/2,and ARF17 specifically regulate the pathway responsible for the synthesis and polymerization of lignin monomers in phase Ⅱ.MYB26-NST1/2 is the key regulatory pathway responsible for endothecium lignification,while ARF17 facilitates this process by interacting with ***,our results demonstrate that the lignification of the endothecium,which occurs within approximately 26 h,is much faster than that of the vascular *** findings provide valuable insights into the regulation mechanism of rapid lignification in the endothecium,which enables timely anther dehiscence and successful pollen release during plant reproduction.

关键词： anther dehiscence ARF17 endothecium lignin MYB26 NST

Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd_(2)As_(2)

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2024年第4期67卷 119-125页

作者： Yuxiang Wang Jianwen Ma Jian Yuan Wenbin Wu Yong Zhang Yicheng Mou Jiaming Gu Peihong Cheng Wu Shi Xiang Yuan Jinglei Zhang Yanfeng Guo Cheng Zhang State Key Laboratory of Surface physics and Institute for Nanoelectronic devices and Quantum Computing Fudan UniversityShanghai 200433China School of physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Anhui Province Key Laboratory of Condensed Matter physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of SciencesHefei 230031China School of physics and Electronic Science East China Normal UniversityShanghai 200241China Zhangjiang Fudan International Innovation Center Fudan UniversityShanghai 201210China shanghaiTech Laboratory for Topological physics Shanghai 201210China

EuCd_(2)As_(2)was theoretically predicted to be a minimal model of Weyl semimetals with a single pair of Weyl points in the ferromagnet ***,the heavily p-doped Eu Cd_(2)As_(2)crystals in previous experiments prevent direct identification of the semimetal ***,we present a comprehensive magneto-transport study of high-quality Eu Cd_(2)As_(2)crystals with ultralow bulk carrier density(10^(13)cm^(-3)).In contrast to the general expectation of a Weyl semimetal phase,Eu Cd_(2)As_(2)shows insulating behavior in both antiferromagnetic and ferromagnetic states as well as surface-dominated conduction from band ***,the application of a dc bias current can dramatically modulate the resistance by over one order of magnitude,and induce a periodic resistance oscillation due to the geometric *** nonlinear transport results from the high nonequilibrium state induced by an electrical field near the band *** results suggest an insulating phase in Eu Cd_(2)As_(2)and put a strong constraint on the underlying mechanism of anomalous transport properties in this system.

关键词： magnetic Weyl semimetal quantum transport Hall effect nonlinear resistivity

The spectrum and stability of travelling pulses in a coupled FitzHugh-Nagumo equation

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2024年第5期67卷 975-1010页

作者： Qi Qiao Xiang Zhang School of Mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Scientific and Engineering Computing(Ministry of education) and Shanghai Frontier Science Center of Modern Analysis(CMA-Shanghai)Shanghai Jiao Tong UniversityShanghai 200240China

For a coupled slow-fast FitzHugh-Nagumo(FHN)equation derived from a reaction-diffusionmechanics(RdM)model,Holzer et al.(2013)studied the existence and stability of the travelling pulse,which consists of two fast orbit arcs and two slow ones,where one fast segment passes the unique fold point with algebraic decreasing and two slow ones follow normally hyperbolic critical curve *** and Zhang(2021)obtained the existence of the travelling pulse,whose two fast orbit arcs both exponentially decrease,and one of the slow orbit arcs could be normally hyperbolic or not at the ***,we characterize both the nonlinear and spectral stability of this travelling pulse.

关键词： coupled FitzHugh-Nagumo equation singular perturbation travelling pulse spectrum nonlinear stability spectral stability

Polymer-supported chiral palladium-based complexes as efficient heterogeneous catalysts for asymmetric reductive Heck reaction

在线全文

学校读者我要写书评

暂无评论

Green Synthesis and Catalysis

Green Synthesis and Catalysis 2024年第2期5卷 102-107页

作者： Hui Zhang Bing Xu Liejin Zhou Zhan-Ming Zhang Junliang Zhang College of Marine Ecology and Environment Shanghai Ocean University999 Hucheng Ring RoadShanghai 201306China department of Chemistry Fudan University2005 Songhu RoadShanghai 200438China Graduate School of pharmaceutical Sciences Tohoku UniversitySendai 980-8578Japan Fudan Zhangjiang Institute Shanghai 201203China

Heterogeneous asymmetric catalysis is an important strategy for the industrial production of chiral ***,we reported a polymer-bound Xu-phos-derived palladium catalyst that shows good performance in heterogeneous asymmetric reductive Heck reaction of allyl aryl *** heterogeneous catalyst was easily prepared by efficient immobilization of the sulfonamide phosphine ligand(Xu-phos)in the cross-linked polystyrene via copolymerization,and exhibits similar catalytic activity and enantioselectivity to that of the homogeneous ***,the heterogeneous catalyst system is proved to be easily recovered and reused several times without losing catalytic activity obviously.

关键词： Heterogeneous catalysis Recoverability Palladium Hydroarylation Asymmetric catalysis

High-efficiency crystalline carbon nitride photocatalysts:Status and perspectives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 7840-7863页

作者： Wenji Pu Yunqiao Zhou Lingfeng Yang Haifeng Gong Yuhan Li Qingyu Yang dieqing Zhang Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Key Laboratory of Catalysis and New Environmental MaterialsChongqing Technology and Business UniversityChongqing 400067China The education Ministry Key Lab of Resource Chemistry Joint International Research Laboratory of Resource Chemistry of Ministry of EducationShanghai Key Laboratory of Rare Earth Functional Materialsand Shanghai Frontiers Science Center of Biomimetic CatalysisShanghai Normal UniversityShanghai 200234China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Crystallinity and crystal structure greatly influence the photocatalytic behavior of *** g-C3N4 produced by traditional thermal-induced polycondensation reaction bears low crystallinity and thus poor photoactivity,which originates from the incomplete polymerization of the precursor containing amine groups,abundant hydrogen bonds,and unreacted amino,as well as cyanide functional groups in the *** photocatalytic process,these residual functional groups often work as electron trap sites,which may hinder the transfer of electrons on the plane,resulting in low ***,crystalline carbon nitride(CCN)was reported as a promising photocatalyst because its increased crystallinity not only reduces the number of carriers recombination centers,but also increases charge conductivity and improves light utilization due to extendedπ-conjugated systems and delocalizedπ-*** such,we summarize the recent studies on CCN-based photocatalysts for the photoactivity ***,the unique structure and properties of CCN materials are ***,the preparation methods and modification strategies are well *** also sum up the applications of CCN-based materials in the environmental purification and energy ***,this review concerning CNN materials ends with prospects and challenges in the obtainment of high crystallinity by effective techniques,and the deep understanding of photocatalytic mechanism.

关键词： crystalline carbon nitride preparation method modification strategy photocatalytic application

Targeting BCL9/BCL9L enhances antigen presentation by promoting conventional type 1 dendritic cell(cdC1)activation and tumor infiltration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第6期9卷 2804-2818页

作者： Fenglian He Zhongen Wu Chenglong Liu Yuanyuan Zhu Yan Zhou Enming Tian Rina Rosin-Arbesfeld dehua Yang Ming-Wei Wang di Zhu department of pharmacology Minhang Hospitaland Key Laboratory of Smart Drug DeliveryShanghai Engineering Research Center of Immune TherapySchool of PharmacyFudan UniversityShanghai 201203China The National Center for drug Screening and the CAS Key Laboratory of Receptor Research Shanghai Institute of Materia MedicaChinese Academy of Sciences(CAS)Shanghai 201203China department of Microbiology and Immunology Sackler Faculty of MedicineTel Aviv UniversityTel AvivIsrael department of pharmacology School of Basic Medical SciencesFudan UniversityShanghai 200032China Research Center for deepsea Bioresources SanyaChina department of Chemistry School of ScienceThe University of TokyoTokyoJapan Engineering Research Center of Tropical Medicine Innovation and Transformation of Ministry of education School of PharmacyHainan Medical UniversityHaikouChina Shandong Academy of pharmaceutical Science JinanChina

Conventional type 1 dendritic cells(cdC1)are the essential antigen-presenting dC subset in antitumor *** B-cell lymphoma 9 and B-cell lymphoma 9-like(BCL9/BCL9L)inhibits tumor growth and boosts immune responses against ***,whether oncogenic BCL9/BCL9L impairs antigen presentation in tumors is still not completely ***,we show that targeting BCL9/BCL9L enhanced antigen presentation by stimulating cdC1 activation and infiltration into *** inhibition of BCL9/BCL9L with a novel inhibitor hsBCL9z96 or Bcl9/Bcl9l knockout mice markedly delayed tumor growth and promoted antitumor Cd8^(+)T cell ***,targeting BCL9/BCL9L promoted antigen presentation in *** is due to the increase of cdC1 activation and tumor infiltration by the XCL1-XCR1 ***,using single-cell transcriptomics analysis,we found that Bcl9/Bcl9l deficient cdC1 were superior to wild-type(WT)cdC1 at activation and antigen presentation via NF-κB/IRF1 ***,we demonstrate that targeting BCL9/BCL9L plays a crucial role in cdC1-modulated antigen presentation of tumor-derived antigens,as well as Cd8^(+)T cell activation and tumor *** BCL9/BCL9L to regulate cdC1 function and directly orchestrate a positive feedback loop necessary for optimal antitumor immunity could serve as a potential strategy to counter immune suppression and enhance cancer immunotherapy.

关键词： immunity Targeting markedly

Inter3d:Capture of TAd Reorganization Endows Variant Patterns of Gene Transcription

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2024年第3期22卷 69-84页

作者： Tianyi ding Shaliu Fu Xiaoyu Zhang Fan Yang Jixing Zhang Haowen Xu Jiaqi Yang Chaoqun Chen Yibing Shi Yiran Bai Wannian Li Xindi Chang Shanjin Wang Chao Zhang Qi Liu He Zhang State Key Laboratory of Cardiology and Medical Innovation Center Institute for Regenerative MedicineShanghai East HospitalFrontier Science Research Center for Stem CellsSchool of Life Science and TechnologyTongji UniversityShanghai 200092China Jiangxi Province Key Laboratory of Organ development and Epigenetics Clinical Medical Research CenterAffiliated Hospital of Jinggangshan UniversityMedical Department of Jinggangshan UniversityJi'an 343009China School of Life Science Jinggangshan UniversityJi'an 343009China

Topologically associating domain(TAd)reorganization commonly occurs in the cell nucleus and contributes to gene activation and inhibition through the separation or fusion of adjacent ***,functional genes impacted by TAd alteration and the underlying mechanism of TAd reorganization regulating gene transcription remain to be fully ***,we first developed a novel approach termed Inter3d to specifically identify genes regulated by TAd *** study revealed that the segregation of TAds led to the disruption of intrachromosomal looping at the myosin light chain 12B(MYL12B)locus,via the meticulous reorganization of TAds mediating epigenomic landscapes within tumor cells,thereby exhibiting a significant correlation with the down-regulation of its transcriptional ***,the fusion of TAds facilitated intrachromosomal interactions,suggesting a potential association with the activation of cytochrome P450 family 27 subfamily B member 1(CYP27B1).Our study provides comprehensive insight into the capture of TAd rearrangement-mediated gene loci and moves toward understanding the functional role of TAd reorganization in gene *** Inter3d pipeline developed in this study is freely available at https://***/bm2-lab/inter3d and https://***/biocode/tool/BT7399.

关键词： Topologically associating domain Inter3d Chromosomal loop Gene transcription Cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高分子囊泡领域面临的挑战和未来研究方向

Science china Materials 2024年第1期67卷 18-30页

作者：石隽秋孙青梅王文立李畅尹海洋李浩澜滕润鑫范震朱云卿杜建忠 department of Gynaecology and Obstetrics Shanghai Key Laboratory of Anesthesiology and Brain Functional ModulationClinical Research Center for Anesthesiology and Perioperative MedicineTranslational Research Institute of Brain and Brain-Like IntelligenceShanghai Fourth People’s HospitalSchool of MedicineTongji UniversityShanghai 200434China department of Polymeric Materials School of Materials Science and EngineeringTongji UniversityShanghai 201804China

作为细胞中的主要运输系统,天然囊泡在物质的定点输运过程中具有至关重要的作用.高分子囊泡是与之结构相似的一种人工囊泡,具有优异的膜稳定性和胶体稳定性、高药物负载率、低膜穿透性、优异的可修饰性和长循环时间等优势,在生物医用领... 详细信息

作为细胞中的主要运输系统,天然囊泡在物质的定点输运过程中具有至关重要的作用.高分子囊泡是与之结构相似的一种人工囊泡,具有优异的膜稳定性和胶体稳定性、高药物负载率、低膜穿透性、优异的可修饰性和长循环时间等优势,在生物医用领域具有广泛的应用前景.然而,目前该领域尚面临一系列重要挑战,如合成和制备方法较为复杂、生物相容性较难预测、功能和递送途径有限等,限制了其临床转化之路.本文从囊泡的构建模块合成、自组装技术和潜在的生物医学应用等角度,提出了设计和制备下一代高分子囊泡需要解决的五个关键科学问题,指出了未来面临的重要挑战和发展方向,例如简化设计和合成过程,优化和规范自组装过程,拓展潜在的应用前景.

关键词：生物医学应用胶体稳定性自组装技术运输系统膜稳定性输运过程穿透性高分子