检索结果-南通市图书馆

Precision Chemistry 2024年第2期2卷 81-87页

作者： Xiushang Xu Amogh Kinikar Marco Di Giovannantonio Carlo A.Pignedoli Pascal Ruffieux Klaus Müllen Roman Fasel Akimitsu Narita Max Planck Institute for Polymer Research 55128 MainzGermany Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate UniversityKunigami-gunOkinawa 904-0495Japan Empa Swiss Federal Laboratories for Materials Science and Technologynanotech@surfaces Laboratory8600 DübendorfSwitzerland Institute of Structure of Matter-CNR(ISM-CNR) 00133 RomaItaly Institute of Physical Chemistry Johannes Gutenberg University Mainz55128 MainzGermany Department of Chemistry Biochemistry and Pharmaceutical SciencesUniversity of Bern3012 BernSwitzerland

On-surface synthesis has emerged as a powerful strategy to fabricate unprecedented forms of atomically precise graphene nanoribbons(GNRs).However,the on-surface synthesis of zigzag GNRs(ZGNR)has met with only limited ***,we report the synthesis and on-surface reactions of 2,7-dibromo-9,9′-bianthryl as the precursor towardπ-extended *** by scanning tunneling microscopy and high-resolution noncontact atomic force microscopy clearly demonstrated the formation of anthracene-fused *** skeletal rearrangements were also observed,which could be explained by intramolecular Diels-Alder *** calculations of the electronic properties of the anthracene-fused ZGNRs revealed spin-polarized edge-states and a narrow bandgap of 0.20 eV.

关键词： On-surface synthesis Graphene nanoribbon On-surface reaction Rearrangement Edge state

Non-adiabatic approximations in time-dependent density functional theory: progress and prospects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 1105-1119页

作者： Lionel Lacombe Neepa T.Maitra Laboratoire des Solides Irradiés École PolytechniqueInstitut Polytechnique de ParisF-91128 PalaiseauFrance Department of Physics Rutgers UniversityNewarkNJ 07102USA

Time-dependent density functional theory continues to draw a large number of users in a wide range of fields exploring myriad applications involving electronic spectra and *** in principle exact,the predictivity of the calculations is limited by the available approximations for the exchange-correlation *** particular,it is known that the exact exchange-correlation functional has memory-dependence,but in practise adiabatic approximations are used which ignore *** we review the development of non-adiabatic functional approximations,their impact on calculations,and challenges in developing practical and accurate memory-dependent functionals for general purposes.

关键词： dynamics adiabatic functional

Interaction of Haematopoietic Tissue Cultures of the Dublin Bay Prawn,Nephrops Norvegicus(L.),with the Causal Agent of Luminous Vibriosis Vibrio Harveyi

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 Ocean University of Qingdao 2002年第1期1卷 66-70页

作者： Mulford A.L. ZHANG X.H. XU H.S. Austin B. Department of Biological Sciences Heriot-Watt UniversityRiccartonEdinburghEH144ASScotlandUK Department of Marine Biology Ocean University of QingdaoQingdao 266003P.R.China

Vibrio harveyi cells(dose>103 cells mL-1)and extracellular products(ECP;>25μg mL-1 of total protein concentration)destroyed haematopoietic cultures of Nephrops norvegicus within 24 h of *** effects(CPE)started after 4 h of exposure to the bacterial cells,with some granularity in the cytoplasm,mostly in cells in the outer periphe-ry of the explant *** the end of the infection,a considerable number of nuclei remained attached to the substrate,apparently *** exposure to ECP,initial deterioration was observed at 2 h with the presence of granularity in the cytoplasm of<20%cells,and few cells displayed small vacuoles around the *** results were obtained using whole animal experiments,with *** cells being lethal to nephrops within 24 h.

关键词： Vibrio haryeyi Dublin Bay prawn haematopoietic tissue interaction

Intracellular Delivery of mRNA in Adherent and Suspension Cells by Vapor Nanobubble Photoporation

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2020年第12期12卷 404-420页

作者： Laurens Raes Stephan Stremersch Juan CFraire Toon Brans Glenn Goetgeluk Stijn De Munter Lien Van Hoecke Rein Verbeke Jelter Van Hoeck Ranhua Xiong Xavier Saelens Bart Vandekerckhove Stefaan De Smedt Koen Raemdonck Kevin Braeckmans Laboratory of General Biochemistry&Physical Pharmacy Ghent University9000 GhentBelgium Cancer Research Institute Ghent(CRIG) 9000 GhentBelgium Department of Diagnostic Sciences Ghent University9000 GhentBelgium VIB-UGent Center for Medical Biotechnology 9052 GhentBelgium Department of Biomedical Molecular Biology Ghent University9000 GhentBelgium Department of Biochemistry and Microbiology Ghent University9000 GhentBelgium

Efficient and safe cell engineering by transfection of nucleic acids remains one of the long-standing hurdles for fundamental biomedical research and many new therapeutic applications,such as CAR T cell-based *** has recently gained increasing attention as a more safe and versatile alternative tool over viral-or DNA transposon-based approaches for the generation of adoptive T ***,limitations associated with existing nonviral mRNA delivery approaches hamper progress on genetic engineering of these hard-to-transfect immune *** this study,we demonstrate that gold nanoparticle-mediated vapor nanobubble(VNB)photoporation is a promising upcoming physical transfection method capable of delivering mRNA in both adherent and suspension *** transfection experiments on HeLa cells showed the importance of transfection buffer and cargo concentration,while the technology was furthermore shown to be effective for mRNA delivery in Jurkat T cells with transfection efficiencies up to 45%.Importantly,compared to electroporation,which is the reference technology for nonviral transfection of T cells,a fivefold increase in the number of transfected viable Jurkat T cells was ***,our results point toward the use of VNB photoporation as a more gentle and efficient technology for intracellular mRNA delivery in adherent and suspension cells,with promising potential for the future engineering of cells in therapeutic and fundamental research applications.

关键词： Transfection mRNA Photoporation Optoporation Gold nanoparticles Vapor nanobubbles

Multifunctional zinc ion doped sol-gel derived mesoporous bioactive glass nanoparticles for biomedical applications

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2019年第1期4卷 312-321页

作者： Zuzana Neščáková Kai Zheng Liliana Liverani Qaisar Nawaz Dagmar Galusková Hana Kaňková Martin Michálek Dušan Galusek Aldo R.Boccaccini Dept.of Biomaterials FunGlass-Centre for Functional and Surface Functionalized GlassAlexander Dubček University of TrenčínSlovakia Central Laboratories FunGlass-Centre for Functional and Surface Functionalized GlassAlexander Dubček University of TrenčínSlovakia Institute of Biomaterials Department of Materials Science and EngineeringUniversity of ErlangenNurembergGermany

Mesoporous bioactive glasses have been widely investigated for applications in bone tissue regeneration and,more recently,in soft tissue repair and wound *** this study we produced mesoporous bioactive glass nanoparticles(MBGNs)based on the SiO2-CaO *** the intention of adding subsidiary biological function,MBGNs were doped with Zn2+***-MBGNs with 8 mol%ZnO content were synthesized via microemulsion assisted sol-gel *** synthesized particles were homogeneous in shape and *** exhibited spherical shape,good dispersity,and a size of 130±10 *** addition of zinc precursors did not affect the morphology of particles,while their specific surface area increased in comparison to *** presence of Zn2+ions inhibited the formation of hydroxycarbonate apatite(HCAp)on the particles after immersion in simulated body fluid(SBF).No formation of HCAp crystals on the surface of Zn-MBGNs could be observed after 14 days of ***,powders containing relatively high amount of zinc released Zn2+ions in low concentration(0.6-1.2 mg L^−1)but in a sustained *** releasing feature enables Zn-MBGNs to avoid potentially toxic levels of Zn2+ions,indeed Zn-MBGNs were seen to improve the differentiation of osteoblast-like cells(MG-63).Additionally,Zn-MBGNs showed higher ability to adsorb proteins in comparison to MBGNs,which could indicate a favourable later attachment of *** to their advantageous morphological and physiochemical properties,Zn-MBGNs show great potential as bioactive fillers or drug delivery systems in a variety of applications including bone regeneration and wound healing.

关键词： Bioactive particles Sol-gel synthesis Zinc Bioactivity Ion release Bioactive glass

Tracing the impact of stack configuration on interface resistances in reverse electrodialysis by in situ electrochemical impedance spectroscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2022年第4期16卷 69-80页

作者： Wenjuan Zhang Bo Han Ramato Ashu Tufa Chuyang Tang Xunuo Liu Ge Zhang Jing Chang Rui Zhang Rong Mu Caihong Liu Dan Song Junjing Li Jun Ma Yufeng Zhang Tianjin Key Laboratory of Aquatic Science and Technology School of Environmental and Municipal EngineeringTianjin Chengjian UniversityTianjin 300384China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China Department of Inorganic Technology University of Chemistry and Technology PragueTechnicka 516628Prague 6Czech Republic Department of Civil Engineering the University of Hong KongHong KongChina Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education) School of Urban Construction and Environmental EngineeringChongqing UniversityChongqing 400044China School of Environmental Science and Engineering Tianjin Polytechnic UniversityTianjin 300387China

Reverse electrodialysis(RED)is an emerging membrane-based technology for the production of renewable energy from mixing waters with different ***,the impact of the stack configuration on the Ohmic and non-Ohmic resistances as well as the performance of RED were systematically studied by using in situ electrochemical impedance spectroscopy(EIS).Three different parameters(membrane type,number of cell pairs and spacer design)were *** Ohmic and non-Ohmic resistances were evaluated for RED stacks equipped with two types of commercial membranes(Type I and Type II)supplied by Fujifilm Manufacturing Europe B.V:Type I Fuji membranes displayed higher Ohmic and non-Ohmic resistances than Type II membranes,which was mainly attributed to the difference in fixed charge *** output power of the stack was observed to decrease with the increasing number of cell pairs mainly due to the increase in ionic shortcut *** the reduction in spacer thickness from 750 to 200μm,the permselectivity of membranes in the stack decreased from 0.86 to 0.79 whereas the energy efificiency losses increased from 31%to 49%.Overall,the output of the present study provides a basis for understanding the impact of stack design on internal losses during the scaling-up of RED.

关键词： Reverse electrodialysis Electrochemical impedance spectroscopy Concentration polarization Spacer shadow effect

Experimental and Data Fitting Guidelines for the Determination of Polymer Crystallization Kinetics

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第6期40卷 658-691页

作者： Ricardo Arpad Perez-Camargo Guo-Ming Liu Du-Jin Wang Alejandro J.Muller Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Engineering PlasticsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China POLYMAT and Department of Polymers and Advanced Materials:Physics Chemistry and TechnologyFaculty of ChemistryUniversity of the Basque Country UPV/EHUDonostia-San Sebastián 20018Spain IKERBASQUE Basque Foundation for ScienceBilbao 48013Spain

The crystallization kinetics of semicrystalline polymers is often studied with isothermal experiments and analyzed by fitting the data with analytical expressions of the Avrami and Lauritzen and Hoffman(LH)*** correctly carry out the analysis,precautions in both experiments and data fitting should be ***,we systematically discussed the factors that influence the validity of the crystallization kinetics *** basic concepts and fundamentals of the Avrami and LH theories were introduced at ***,experimental protocols were discussed in *** clarify the impact of various experimental parameters,selected common polymers,i.e.,polypropylene and polylactide,were studied using various experimental techniques(i.e.,differential scanning calorimetry and polarized light optical microscopy).Common mistakes were simulated under conditions when non-ideal experimental parameters were ***,from a practical point of view,we show how to fit the experimental data to the Avrami and the LH theories,using an Origin■App developed by us.

关键词： Isothermal crystallization Avrami equation Lauritzen and Hoffman theory Thermal analysis Step-crystallization

Laboratory studies on leaching of HBCDD from building insulation foams

在线全文

学校读者我要写书评

暂无评论

Emerging Contaminants 2019年第1期5卷 36-44页

作者： William A.Stubbings Stuart Harrad School of Geography Earth&Environmental SciencesUniversity of BirminghamBirminghamB152TTUK

A series of laboratory experiments were conducted to study emissions of hexabromocyclododecane(HBCDD)into aqueous leaching fluid under simulated landfill ***(EPS)and extruded(XPS)polystyrene building insulation foam samples containing HBCDD were contacted with deionised Milli-Q water containing 0,100 and 1000 mg L1 dissolved humic matter(DHM)as leaching *** of HBCDD were determined in the resulting fluid and single and serial batch experiments *** impacts on HBCDD concentrations in the leaching fluid temperature and pH were *** from these experiments show that HBCDD concentrations in leaching fluid following contact with EPS and XPS almost all exceeded the aqueous solubilities for each diastereomer and the technical HBCDD *** indicates that agitation and abrasion of EPS and XPS were significant mechanisms of HBCDD emission to leaching ***,under such conditions,HBCDD is likely associated with fine abraded particles of the foam and concentrations in the leaching fluid are therefore not limited by the aqueous solubility of *** with this,the length of contact time had a significant positive effect on concentrations of all diastereomers in the leaching fluid for XPS and for the least soluble diastereomer,g-HBCDD for ***,the presence of DHM in the leaching fluid and elevated leaching fluid temperatures had significant positive effects on HBCDD concentrations in leaching fluid for both EPS and ***,while leaching fluids of pH 8.5 significantly enhanced concentrations of a-HBCDD released from EPS,pH exerts a minor effect on concentrations of HBCDD in leaching fluid.

关键词： Expanded polystyrene Extruded polystyrene Hexabromocyclododecane Landfill Brominated flame retardants

Polarity,intramolecular charge transfer,and hydrogen bond comediated solvent effects on the optical properties of graphene quantum dots

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 2023年第1期16卷 45-52页

作者： Yalei Hu Christof Neumann Lena Scholtz Andrey Turchanin Ute Resch-Genger Siegfried Eigler Institute of Chemistry and Biochemistry Freie Universität BerlinTakustraße 314195 BerlinGermany Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University JenaLessingstraße 1007743 JenaGermany Federal Institute for Materials Research and Testing(BAM) Division BiophotonicsRichard Willstätter Straße 1112489 BerlinGermany

Graphene quantum dots(GQDs)have attracted increasing attention due to their favorable optical properties and have been widely used,e.g.,in the biomedical ***,the properties related to the chemical structure of GQDs,resulting in solventdependent optical properties,still remain ***,we present the synthesis of long-wavelength emitting GQDs with a size of about 3.6 nm via a solvothermal method using oxo-functionalized graphene(oxo-G)and p-phenylenediamine as precursors and their structural and surface chemical analysis by transmission electron and atomic force microscopy(TEM;AFM)as well as Fourier-transform infrared,Raman,and X-ray photoelectron spectroscopy(FTIR;Raman;XPS).Subsequently,the influence of solvent polarity and proticity on the optical properties of the as-prepared GQDs bearing–OH,–NH_(2),–COOH and pyridine surface groups was *** on the results of the absorption and fluorescence(FL)studies,a possible luminescence mechanism is *** observed solvent-induced changes in the spectral position of the FL maximum,FL quantum yield,and FL decay kinetics in protic and aprotic solvents of low and high polarity are ascribed to a combination of polarity effects,intramolecular charge transfer(ICT)processes,and hydrogen ***,the potential of GQDs for the optical sensing of trace amount of water was *** results of our systematic spectroscopic study will promote the rational design of GQDs and shed more light on the FL mechanism of carbon-based fluorescent nanomaterials.

关键词： graphene quantum dots(GQDs) polarity intramolecular charge transfer(ICT) hydrogen bond optical properties

Numerical Simulations of the Ice Load of a Ship Navigating in Level Ice Using Peridynamics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2019年第11期121卷 523-550页

作者： Yanzhuo Xue Renwei Liu Yang Liu Lingdong Zeng Duanfeng Han College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China

In this study,a numerical method was developed based on peridynamics to determine the ice loads for a ship navigating in level *** analysis of threedimensional ice specimen with tensile and compression loading are carried out *** effects of ice thickness,sailing speed,and ice properties on the mean ice loads were also *** is observed that the ice fragments resulting from the icebreaking process will interact with one another as well as with the water and ship *** ice fragments may rotate,collide,or slide along the ship hull,and these ice fragments will eventually drift away from the *** key characteristics of the icebreaking process can be obtained using the peridynamic model such as the dynamic generation of cracks in the ice sheet,propagation and accumulation of ice fragments,as well as collision,rotation,and sliding of the ice fragments along the ship *** simulation results obtained for the ice loads and icebreaking process were validated against those determined from the Lindqvist empirical formula and there is good agreement between the results.

关键词： Peridynamics ice load level ice ship-ice interaction ice properties convergence