检索结果-南通市图书馆

ch.nese chemical Letters 2024年第10期35卷 267-269页

作者： Yu Pang min Wang ning-Hua Yang min Xue Yong Yang School of Science Department of Physics Key Laboratory of Optical Field Manipulation of Zhejiang Province Zhejiang Sci-Tech University School of chemistry and chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University

Trifluoroacetic acid （TFA） catalyzed condensation reaction between tetraaminooxacalix[4]arene and n-alkylcarbazole-3,6-dicarbaldehyde in ch2Cl2afforded a single product in 87%–89%***-defined yet undissolvable1H nMR spectra suggested formation of robust and discrete structures in solution.X-ray single crystal analysis further revealed a giant twisted double-layer chiral macrocycle in the solid state,which was formed from[4+8]condensation of the two reactants via 16 imine *** calculations discovered that only the[4+8]twisted product is thermodynamically favorable,which accounts for its highly selective and efficient formation out of a library of many other combinations.

关键词： chiral macrocycle Dynamic covalent chemistry One-pot synthesis Oxacalixarene X-ray single crystal

Physiological and pathological functions of circular RnAs in the nervous system

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

neural Regeneration Research 2024年第2期19卷 342-349页

作者： min Zhou Shi Li chuan Huang School of Life Sciences Chongqing UniversityChongqingChina

Circular RnAs(circRnAs)are a class of covalently closed single-stranded RnAs that are expressed during the development of specific cells and *** play crucial roles in physiological and pathological processes by sponging microRnAs,modulating gene transcription,controlling the activity of certain RnA-binding proteins,and producing functional peptides.A key focus of research at present is the functionality of circRnAs in the nervous system and several advances have emerged over the last 2 ***,the precise role of circRnAs in the nervous system has yet to be comprehensively *** this review,we first summarize the recently described roles of circRnAs in brain development,maturity,and ***,we focus on the involvement of circRnAs in various diseases of the central nervous system,such as brain cancer,chronic neurodegenerative diseases,acute injuries of the nervous system,and neuropathic pain.A better understanding of the functionality of circRnAs will help us to develop potential diagnostic,prognostic,and therapeutic strategies to treat diseases of the nervous system.

关键词： Alzheimer’s disease amyotrophic lateral sclerosis brain development circRnAs neuropathic pain Parkinson’s disease

Floating plants reduced methane fluxes from wetlands by creating a habitat conducive to methane oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第1期135卷 149-160页

作者： Fuwei Wang Songhe Zhang Xiuren Hu Xin Lv min Liu Yu Ma Benjamin Manirakiza Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China ch.na Mach.nery International Engineering Desigh and Research Institute co. Ltd.East China Regional CenterNanjing 210008China

Wetlands are one of the important natural sources of atmospheric methane (ch_4),as an important part of wetlands,floating plants can be expected to affect methane ***,the effects of floating plants on methane release are *** this study,methane fluxes,physiochemical properties of the overlying water,methane oxidation potential and rhizospheric bacterial community were investigated in simulated wetlands with floating plants Eichhornia crassipes,Hydrocharis dubia,and Trapa *** found that ***,***,and *** plants could inhibit 84.31%-97.31%,4.98%-88.91%and 43.62%-92.51%of methane fluxes at interface of water-atmosphere compared to Control,*** fluxes were negatively related to nutrients concentration in water column but positively related to the aerenchyma proportions of roots,stems,and *** the same biomass,root of *** (36.44%) had the highest methane oxidation potential,followed by *** (12.99%) and *** (11.23%).Forty-five bacterial phyla in total were identified on roots of three plants and 7 bacterial genera (2.10%-3.33%) were known *** I methanotrophs accounted for 95.07%of total *** pmoA gene abundances ranged from 1.90×10^(16)to 2.30×10^(18)copies/g fresh weight of root *** of pmoA gene was significantly positively correlated with environmental *** (5.40%) and methanotrophy (3.75%) function were closely related to methane *** study highlights that floating plant restoration can purify water and promote carbon neutrality partially by reducing methane fluxes through methane oxidation in wetlands.

关键词： Floating plants Methane fluxes Aerenchyma Methanotrophs

Efficient adsorption separation of methane from C_(2)-C_(3) hydrocarbons in a Co(Ⅱ)-nodes metal-organic framework

在线全文

学校读者我要写书评

暂无评论

ch.nese Journal of chemical Engineering 2024年第5期69卷 192-198页

作者： Jie Zhang Xingzhe Guo Bing Lin Guangzu Xiong Hanshuang Wang min Zhang Liwen Fan Bingwen Li Shuisheng ch.n Department of chemistry and chemical Engineering Taiyuan Institute of TechnologyTaiyuan 030008China Engineering Research Center of Oligosaccharides Fuyang Normal UniversityFuyang 236041China Shandong Key Laboratory of Biophysics Institute of BiophysicsDezhou UniversityDezhou 253023China

Methane(ch_(4))as a substitute for other mineral fuels plays a crucial role in reducing energy consumption and preventing environmental *** present study employs a solvothermal method to fabricate a porous framework Co-metal-organic framework(Co-MOF)containing two distinct secondary building units(SBUs):an anionic[Co_(2)(μ_(2)-OH)(COO)_(4)(H_(2)O)]and a neutral[Con_(2)(COO)_(2)].notably,within the anionic SBUs,the coordinated water molecules induce the generation of divergent unsaturated Co(Ⅱ)centers in the unidirectional porous ch.nnels,thereby creating open metal *** adsorption performance of Co-MOF towards pure component gases was systematically *** results demonstrated that Co-MOF exhibits superior adsorption capacity for C_(2)-C_(3) hydrocarbons compared to ch_(4),which offers the potential for efficient adsorption and separation of ch_(4) from C_(2)-C_(3) *** gas selectivity separation ratios of Co-MOF for C_(2)H_(6)/ch_(4) and C_(3)H_8/ch_(4) were calculated using the ideal adsorbed solution theory method at 273/298 K and 0.1 *** results revealed that Co-MOF achieved remarkable equilibrium separation selectivity for ch_(4) and C_(2)-C_(3) hydrocarbon gases among non-modified MOFs,signifying the potential of the synthesized Co-MOF for efficient recovery and purification of ch_(4) from C_(2)-C_(3) *** experiments further demonstrate the ability of Co-MOF to purify methane from C_(2)-C_(3) hydrocarbons in practical gas separation ***,molecular simulation calculations further substantiate the propensity of anionic SBUs to interact with C_(2)-C_(3) hydrocarbon *** study provides a novel paradigm for the development of porous MOF materials in the application of gas mixture separation.

关键词： Co-MOF Separation hydrocarbons Dynamic breakthrough curves Molecular simulations adsorbent Monte Carlo simulation

Solid-liquid extraction for yttrium recovery using porous polymeric resin(XAD-7) functionalized with D_(2)EHPA

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1764-1773,I0005页

作者： P.A.Martínez-Montoya R.G.Sanchez-Alvarado D.Y.Medina-Velazquez M.L.Carrera-Jota P.Garnica-chávez A.de J.Morales-Ramirez Higher School of chemical Engineering and Extractive Industries ESIQIEIPNDepartment of Metallurgical EngineeringUPALM S/NCol.LindavistaGustavo A.Madero Cd.de MéxicoC.P07738Mexico Metropolitan Autonomous University Department of MaterialsBasic Sciences and EngineeringAv.San Pablo No.180Col.Reynosa TamaulipasCd.de MéxicoC.P02200Mexico Center for Research and Technological Innovation CIITECIPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P02250CDMXMexico

The recovery of yttrium is proposed by applying a solid-liquid extraction process using di-2-ethyl hexylphosphoric acid(D2EHPA) as extracting *** extracting agents were supported on a macro porous polymeric resin XAD-7(solid phase).Yttrium ions extraction and discharge tests were performed,firstly from a synthetic aqueous solution of 100 mg/L Y(liquid phase) at 25℃ with *** effects of pH of aqueous solutions bearing yttrium,volume fraction of extracting agents and the solid/liquid(S/L)ratio on the yttrium recovery were *** most favorable conditions for yttrium ions extraction are;20 vol% D_(2)EHPA functionalized resin,pH=1.5 and an S/L ratio of 10 mg/mL The discharge of yttrium ions was done under the same conditions of extraction stage,using a 2 mol/L [H_(2)SO_(4)] as stripping *** to 80% yttrium is extracted,while 75% yttrium is recovered in the striping *** all experiments,the reaction equilibrium is reached after 20 min,and the kinetics for the extraction stage was determined as a second-order ***,experiments were carried out to discharge the yttriumloaded resins,and it has been determined that the best pH value to strip the Y ions is *** tests of extraction and discharge for yttrium ions show that the functionalized resin can work at least five cycles without decreasing its ***,the proposed process was tested in a real solution with Y ions fro m a waste fluorescent la mp powder leached in H_(2)SO_(4),demonstrating the ability to effectively recover yttrium,separating it from various metals from the studied residue.

关键词： Yttrium recovery Rare earth solid-liquid extraction XAD-7 resin Fluorescent lamps recycling Solid-liquid kinetics extraction

Top-quark rare decays with flavor violation

在线全文

学校读者我要写书评

暂无评论

ch.nese Physics C 2024年第9期48卷 68-81页

作者： ming-Yue Liu Shu-min Zhao Song Gao Xing-Yu Han Tai-Fu Feng Department of Physics Hebei UniversityBaoding 071002China Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory Baoding 071002China Hebei Research Center of the Basic Discipline for Computational Physics Baoding 071002China Department of Physics Chongqing UniversityChongqing 401331China

In the present study,we investigated the decays of the top quark:t→cy,t→cg,t→cZ,and t→*** are extremely rare processes in the standard model(SM).As the U(1)extension of the minimal supersymmetric standard model(MSSM),the U(1)_X SSM features new superfields such as the right-handed neutrinos and three Higgs *** analyzed the effects of different sensitive parameters on the results and made reasonable theoretical predictions,thereby providing a useful reference for future experimental *** the constraint set by the updated experimental data,the numerical results show that the branch.ng ratios of the four proccsscs,i.e.,t→cγ,cg,cZ,ch,can reach the same order of magnitude as their experimental upper *** them,tanβhas the most evident effect on these processes and is the main parameter;g_(X),g_(YX),μ,M_(2),λ_(H),M_(U23)^(2),and M_(Q23)^(2) are also important parameters for the processes,and have effects on the numerical results.

关键词： Top quark flavor violation U(1)_(X)SSM new physics

Mech.nistic investigation on Ag-Cu_(2)O in electrocatalytic CO_(2) to ch_(4) by in situ/operando spectroscopic and theoretical analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Energy chemistry 2024年第1期88卷 521-531,I0012页

作者： min Sun Luxiao Zhang Fuli Tian Jiaxin Li Yanqiu Lei Heng Zhang Lifeng Han Zhihua Guo Yonghui Gao Fenrong Liu Yan Wang Luhui Wang Shanghong Zeng School of chemistry and chemical Engineering Inner Mongolia UniversityHohhot 010021Inner MongoliaChina Key Laboratory of Medicinal and Edible Plants Resources of Hainan Province Hainan Vocational University of Science and TechnologyHaikou 571126HainanChina State Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030Inner MongoliaChina Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control Zhejiang Ocean UniversityZhoushan 316022ZhejiangChina

Silver-copper electrocatalysts have demonstrated effectively catalytic performance in electroreduction CO_(2) toward ch_(4),yet a revealing insight into the reaction pathway and mech.nism has remained ***,we construct chemically bonded Ag-Cu_(2)O boundaries,in which the complete reduction of Cu_(2)O to Cu has been strongly impeded owing to the presence of surface Ag *** interfacial confinement effect helps to maintain Cu^(+)sites at the Ag-Cu_(2)O *** in situ/operando spectroscopy and theoretical simulations,it is revealed that CO_(2) is enriched at the Ag-Cu_(2)O boundaries due to the enhanced physisorption and chemisorption to CO_(2),activating CO_(2) to form the stable intermediate^(*)*** boundaries between Ag shell and the Cu_(2)O mediate local^(*)CO coverage and promote^(*)chO intermediate formation,consequently facilitating CO_(2)-to-ch_(4) *** work not only reveals the structure-activity relationships but also offers insights into the reaction mech.nism on Ag-Cu catalysts for efficient electrocatalytic CO_(2) reduction.

关键词： Ag shell Interfacial confinement effect Cu~+ Local*CO coverage CO_(2)reduction

A study on wildfire impacts on greenhouse gas emissions and regional air quality in South of Orléans,France

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第1期135卷 521-533页

作者： chaoyang Xue Gisèle Krysztofiak Yangang Ren min Cai Patrick Mercier Frédéric Le Fur Corinne Robin Benoit Grosselin Véronique Daele Max RMcGillen Yujing Mu Valéry Catoire Abdelwahid Mellouki Laboratoire de Physique et chimie de l’Environnement et de l’Espace(LPC2E) CNRS–UniversitéOrléans–CNES(UMR 7328)Orléans Cedex 245071France Institut de Combustion AérothermiqueRéactivitéEnvironnement(ICARE)CNRSOrléans Cedex 245071France Research Centre for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Lig’Air-Association de surveillance de la qualitéde l’air en région Centre-Val de Loire Saint-Cyr-en-Val 45590France Mohammed V University RabatMorocco

Wildfire events are increasing globally which may be partly associated with climate ch.nge,resulting in significant adverse impacts on local,regional air quality and global *** September 2020,a small wildfire(burned area:36.3 ha)event occurred in Souesmes(Loiret-cher,Sologne,France),and its plume spread out over 200 km on the following day as observed by the MODIS *** on measurements at a suburban site(~50 km northwest of the fire location)in Orléans and backward trajectory analysis,young wildfire plumes were *** increases in gaseous pollutants(CO,ch_(4),n_(2)O,VOCs,etc.)and particles(including black carbon)were found within the wildfire plumes,leading to a reduced air *** factors,defined as EF(X)=ΔX/ΔCO(where,X represents the target species),of various trace gases and black carbon within the young wildfire plumes were determined accordingly and compared with previous *** in the ambient ions(such as ammonium,sulfate,nitrate,chloride,and nitrite in the particle-and gasphase)and aerosol properties(e.g.,aerosol water content,aerosol p H)were also quantified and ***,we estimated the total carbon and climate-related species(e.g.,CO_(2),ch_(4),n_(2)O,and BC)emissions and compared them with fire emission *** biomass burning emission inventories have uncertainties in estimating small fire burned areas and *** instance,we found that the Global Fire Assimilation System(GFAS)may underestimate emissions(e.g.,CO)of this small wildfire while other inventories(GFED and FInn)showed significant *** that it is the first time to record wildfire plumes in this region,related atmospheric implications are presented and discussed.

关键词： Wildfire Air quality Emission factor Emission inventory VOLTAIRE supersite

Match.ng traditional ch.nese medicine and western medicine-based research:Advanced nutraceutical development for proactive gastric cancer prevention

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第9期16卷 3798-3819页

作者： Matteo Micucci Bian-Zhao Xiang ch.n-min Ting Hiu-Yee Kwan Michele Mari Michele Retini Sabrina Burattini Riham Osman Udodinma Jude Okeke Fuad Othman Abdullah Federico Gianfanti Michela Battistelli Department of Biomolecular Sciences University of Urbino Carlo BoUrbino 61029Italy Hong Kong ch.nese Medicine Clinical Study Centre Chinese EQUATOR CentreSchool of Chinese MedicineChinese Clinical Trial Registry(Hong Kong)Hong Kong Baptist UniversityHong Kong 999077China Centre for ch.nese Herbal Medicine Drug Development Hong Kong Baptist UniversityHong Kong 999077China Centre for Cancer and Inflammation Research School of Chinese MedicineHong Kong Baptist UniversityHong Kong 999077China Department of chemistry College of ScienceSalahaddin University-ErbilErbil 44001Iraq Department of Pharmacognosy Faculty PharmacyTishk International UniversityErbil 44001Iraq Institute of Oncology Research Bellinzona CH6500Switzerland Universitàdella Svizzera Italiana Lugano CH6900Switzerland

Gastric cancer(GC),the third leading cause of cancer-related death globally,is complex and *** review explores multidisciplinary investigations of traditional ch.nese medicine(TCM)combined with Western medical practices,emphasizing the development of nutraceuticals for cancer *** advanced analytical chemistry and food chemistry techniques,this study investigated how TCM components may be optimized for nutraceutical *** on molecular interactions with GC pathways,particularly the nF-κB,PI3K/Akt,and Wnt/β-catenin pathways,we examined the effects of TCM polyherbal formulas,extracts,and isolated *** agents modulate apoptosis and cellular proliferation,underscoring their potential in preventive *** convergence of nutraceutical and medicine food homology studies highlights a significant shift towards integrating TCM-derived compounds in a preventive health *** approach aims not only to enhance efficacy and reduce side effects but also to champion a preventive paradigm using personalized medicine to advance proactive health maintenance and disease *** combination of TCM and western medical practices offers promising avenues for future research and practical applications in GC prevention.

关键词： Traditional ch.nese medicine Precision medicine Molecular network Phytochemistry Food chemistry nutraceuticals Gastric cancer

面向科技文献多维语义组织的混合倒排索引构建方法

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代情报 2024年第2期44卷 107-114,129页

作者：张敏李唯范青中国科学院武汉文献情报中心湖北武汉430071 武汉软件工程职业学院(武汉开放大学) 湖北武汉430205 华中师范大学国家文化产业研究中心湖北武汉430079 科技大数据湖北省重点实验室湖北武汉430071

[目的/意义]为满足科研人员对科技文献内部细粒度语义信息进行高效查询的迫切需求,前期研究提出了面向科技文献的多维语义索引体系,然而基于HashMap的常见倒排索引会导致查询效率低下。本文旨在通过面向不同维度语义特征建立混合倒排索... 详细信息

[目的/意义]为满足科研人员对科技文献内部细粒度语义信息进行高效查询的迫切需求,前期研究提出了面向科技文献的多维语义索引体系,然而基于HashMap的常见倒排索引会导致查询效率低下。本文旨在通过面向不同维度语义特征建立混合倒排索引,以改进语义查询性能。[方法/过程]本文以Treap、B+树等多种数据结构探索适合不同语义维度的倒排索引构建方法,并将其组合形成多种适用于科技文献多维语义组织的混合倒排索引构建方法,并通过对比实验,在排序查询和布尔查询条件下分析验证不同类型倒排索引构建方法的查询性能。[结果/结论]实验结果表明,组合形成的8种混合倒排索引构建方法中,表2所示的C3(HHHB)被证明在排序查询条件下具有最高的效率,而C4(TTTB)则在布尔查询条件下被证明最为高效。本文的方法能有效解决单一索引结构导致的查询效率问题。

关键词：科技文献语义组织混合倒排索引 HashMap Treap B+树