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Journal of Materials Science & Technology 2021年第7期66卷 128-138页

作者： Changhong Cai Marta M.Alves Renbo Song Yongjin Wang Jingyuan Li School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China centro de qufmica estrutural Instituto Superior TecnicoUniversidade de LisboaAv.Rovisco Pais1049-001LisboaPortugal

AnMg-2Zn-0.6Zr-0.6Nd alloy for biodegradable cardiovascular stent applications was prepared through indirect extrusion. The alloy exhibited a superior combination of tensile yield strength(TYS), ultimate tensile strength(UTS) and elongation(EL) of about 269 MPa, 298 MPa and 25.6 %, respectively. In addition,the non-destructive electrochemical frequency modulation(EFM) technique was used for the first time to investigate the corrosion behavior of Mg alloys combined with electrochemical impedance spectroscopy(EIS) in Dulbecco’s Modified Eagle’s Medium(DMEM) and in Hank’s solution. Compared with the corrosion rate of 0.07 mm/year in Hank’s solution, lower corrosion rate of 0.03 mm/year was achieved in DMEM. The significant differences between the corrosion rate trends were discussed and related with the composition of the corrosion layer formed. depending on the biomimetic fluids tested, different corrosion products were precipitated on the alloy’s surface: a compact and homogeneous layer of Mg_(x)Ca_(y)(PO_(4))_(z) and Zn(OH)_(2) and organic compounds was formed in DMEM, whereas a partial coverage of Mg_(x)Ca_(y)(PO_(4))_(z) and Zn(OH)_(2) was formed in Hank’s solution.

关键词： Mg-Zn-Zr-Nd alloy Mechanical property Corrosion EIS EFM

degradation of duloxetine: Identification of transformation products by UHPLC-ESI(+)-HRMS/MS,in silico toxicity and wastewater analysis

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Journal of Environmental Sciences 2019年第8期31卷 113-123页

作者： Rodrigo A.Osawa Ana P.Carvalho Olinda C.Monteiro M.Conceicao Oliveira M.Helena Florêncio centro de Química e Bioquímica Faculdade de Ciências Universidade de Lisboa Laboratório de FTICR e Espectrometria de Massa estrutural Faculdade de Ciências Universidade de Lisboa centro de Química estrutural Instituto Superior Técnico Universidade de Lisboa

Duloxetine(DUL), an antidepressant drug, has been detected in surface water and wastewater effluents, however, there is little information on the formation of its transformation products(TPs). In this work, hydrolysis, photodegradation(UV irradiation) and chlorination experiments were performed on spiked distillated water, under controlled experimental conditions to simulate abiotic processes that can occur in the environment and wastewater treatment plants(WWTPs). Eleven TPs, nine from reaction with UV light and two from chlorine contact, were formed and detected by ultra-high performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry, and nine of them had their chemical structures elucidated upon analyses of their fragmentation patterns in MS/MS spectra. The formation and degradation of the TPs were observed. The parent compound was completely degraded after30 min in photodegradation and after 24 hr in chlorination. Almost all TPs were completely degraded in the experiments. The ecotoxicity and mutagenicity of the TPs were predicted based on several in silico models and it was found that a few of these products presented more ecotoxicity than DUL itself and six TPs showed positive mutagenicity. Finally, wastewater samples were analyzed and DUL and one TP, possibly formed by chlorination process, were detected in the effluent, which showed that WWTP not only did not remove DUL, but also formed a TP.

关键词： High resolution mass spectrometry Duloxetine degradation processes Transformation products Wastewater analysis In silico toxicity

A comparative study on emergent pollutants photo-assisted degradation using ruthenium modified titanate nanotubes and nanowires as catalysts

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Journal of Environmental Sciences 2020年第6期32卷 38-51页

作者： Beatriz Barrocas M.Conceicao Oliveira Helena I.S.Nogueira Sara Fateixa Olinda C.Monteiro centro de Química estrutural Faculdade de CienciasUniversidade de LisboaLisboa 1749-016Portugal centro Química estrutural Instituto Superior TécnicoUniversidade de LisboaLisboa 1049-001Portugal department of Chemistry CICECO-Aveiro Institute of MaterialsUniversity of AveiroAveiro 3810-193Portugal

Several methods have been used to tailor nanomaterials structure and ***,slight changes in the structure outcomes expressive improvements in the optical and photocatalytic properties of semiconductor *** this context,the influence of the metal doping and the morphology on a catalyst performance was studied in this ***,ruthenium doped titanate nanotubes(RuTNT)were synthesised for the first time using an amorphous Ru-containing ***,the photocatalytic performance of this sample was compared to the one obtained for ruthenium titanate nanowires(RuTNW),recently *** samples,RuTNW and RuTNT,were produced using the same Ru-containing precursor but distinct hydrothermal *** powders were structural,morphological and optical characterized by X-ray diffraction and fluorescence,transmission electron microscopy,Raman,X-ray photoelectron and photoluminescence *** variations on the structural and optical properties of the RuTNT and RuTNW nanoparticles,due to ruthenium incorporation were *** potential use as photocatalysts was evaluated on the hydroxyl radical photo-assisted *** samples were catalytic for this reaction,presenting better performances than the pristine counterparts,being RuTNT the best ***,the degradation of two emergent pollutants,caffeine and sulfamethazine,was *** demonstrated to be better photocatalyst than RuTNW for caffeine but identical performances were obtained for *** both catalysts,the degradation mechanism of the pollutants was explored through the identification and quantification of the intermediate compounds produced and several differences were *** indicates the importance of the structural and morphological aspects of a material on its catalytic performance.

关键词： Titanate nanotubes and nanowires Ruthenium doping Ru-Ti replacement Emergent pollutants Photocatalytic degradation

Are eavesdroppers multimodal？ Sensory exploitation of floral signals by a non-native cockroach Blatta orientalis

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Current Zoology 2011年第2期57卷 162-174页

作者： Rodrigo C. VERGARA Alejandra TORRES-ARANEDA Diego A. VILLAGRA Robert A. RAGUSO Mary T. K. ARROYO Cristian A. VILLAGRA Instituto de Ecologfa y Biodiversidad IEB Universidad de Chile Santiago Chile centro de Recursos Naturales y Medio Ambiente Departamento de Qufmica Facultad de Ciencias Universidad de Tarapaca Arica Chile department of Neurobiology and Behavior Cornell University Ithaca NY 14853 USA Instituto de Entomologfa Universidad Metropolitana de Ciencias de la Educacion Casilla 147 SantiagoChile

The study of multi-modal communication has only recently been extended to innate and learned interactions between flowers and their animal visitors, and usually only to pollinators. Here we studied the relevance of floral scent and visual display of a night blooming, putatively hawkmoth-pollinated plantOenothera acaulis(Onagraceae) in the attraction of non-native cockroachesBlatta orientalis(Blattodea: Blattidae), which function as facultative floral larcenists in coastal habitats of central Chile. We experimentally decoupled visual (corolla) and olfactory (fragrance) stimuli by presenting paper corollas and green mesh bags, with or without a freshly-picked natural flower inside. We then contrasted the behavioral responses of roaches in these treatments with those to the natural combination of traits in actual flowers and their respective control treatments, measuring the roaches’ frequency of first visits, mean and total residence time spent in each treatment. The roaches primarily used olfactory cues when approachingO. acaulisflowers at two biologically relevant spatial scales. In addition, the presence of conspecific roaches had a strong influence on recruitment to the experimental arena, increasing the statistical differences among treatments. Our results suggest a primacy of floral fragrance over visual stimuli in the foraging responses ofB. orientalis. Olfactory cues were necessary and sufficient to attract the roaches, and the visual cues presented in our manipulations only marginally increased their attraction within a 20 cm diameter of the stimulus. The full spectrum of floral visitation behavior was not elicited by the artificial flowers, suggesting the need for additional tactile or contact chemosensory stimuli not provided by paper. Although the nitrogenous scent compounds that we found inO. acaulisflowers are almost exclusively found in hawkmoth-pollinated flowers, the attractiveness of these compounds to a non-native, facultative flower-visiting insect

关键词：蟑螂花香多式联运信号香味化合物窃听开发感官

Mechanobiology of the cell surface:Probing its remodeling dynamics using membrane tether pulling assays with optical tweezers

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BIOCELL 2022年第9期46卷 2009-2013页

作者： JULIANA SOARES DOUGLAS G.FREITAS PEDRO S.LOURENÇO JEFTE FARIAS BRUNO PONTES centro Nacional de Biologia estrutural e Bioimagem-CENABIO Universidade Federal do Rio de JaneiroRio de Janeiro21941-902Brazil Programa de Pós-graduação em Ciências Biológicas Biofísica Instituto de Biofísica Carlos Chagas FilhoUniversidade Federal do Rio de JaneiroRio de Janeiro21941-902Brazil Programa de Pós-graduação Multidisciplinar em Física Aplicada Instituto de FísicaUniversidade Federal do Rio de JaneiroRio de Janeiro21941-972Brazil Instituto de Ciências Biomédicas Universidade Federal do Rio de JaneiroRio de Janeiro21941-902Brazil Programa de Pós-graduação em Biotecnologia Instituto de Ciências BiológicasUniversidade Federal do AmazonasManaus69067-005Brazil

Mammalian cell surfaces consist of the plasma membrane supported by an underneath cortical ***,these structures can control not only the shape of cells but also a series of cellular functions ranging from migration and division to exocytosis,endocytosis and ***,the cell surface is capable of exerting and reacting to mechanical *** viscoelastic properties,especially membrane tension and bending modulus,are fundamental parameters involved in these *** viewpoint summarizes our current knowledge on how to measure the viscoelastic properties of cell surfaces employing optical tweezers-based tether assays,paving the way for a better understanding of how cells react to external mechanical forces,with a glance on their remodeling dynamics and possible consequences on downstream cellular processes.

关键词： Cell surface architecture Actin cortex Membrane-cytoskeleton complex Optical tweezers Tether extraction

Compositional engineering of HKUST-1/sulfidized NiMn-LDH on functionalized MWCNTs as remarkable bifunctional electrocatalysts for water splitting

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Carbon Energy 2023年第12期5卷 1-20页

作者： Mengshan Chen Reza Abazari Soheila Sanati Jing Chen Mingyuzhi Sun Cunhong Bai Alexander M.Kirillov Yingtang Zhou Guangzhi Hu Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushanChina department of Chemistry Faculty of ScienceUniversity of MaraghehMaraghehIran State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuanChina departamento de Engenharia Química Centro de Química EstruturalInstitue of Molecular SciencesInstituto Superior TécnicoUniversidade de LisboaLisbonPortugal School of Ecology and Environmental Science Institute for Ecological Research and Pollution Control of Plateau LakesYunnan UniversityKunmingChina

Water-splitting reactions such as the hydrogen evolution reaction(HER)and the oxygen evolution reaction(OER)typically require expensive noble metal-based *** has motivated researchers to develop novel,cost-effective electrocatalytic *** this study,a new multicomponent nanocomposite was assembled by combining functionalized multiwalled carbon nanotubes,a Cu-based metal–organic framework(MOF)(HKUST-1 or HK),and a sulfidized NiMn-layered double hydroxide(NiMn-S).The resulting nanocomposite,abbreviated as MW/HK/NiMn-S,features a unique architecture,high porosity,numerous electroactive Cu/Ni/Mn sites,fast charge transfer,excellent structural stability,and *** a current density of 10 mA cm-2,this dual-function electrocatalyst shows remarkable performance,with ultralow overpotential values of 163 mV(OER)or 73 mV(HER),as well as low Tafel slopes(57 and 75 mV dec-1,respectively).Additionally,its high turnover frequency values(4.43 s-1 for OER;3.96 s-1 for HER)are significantly superior to those of standard noble metal-based Pt/C and IrO2 *** synergistic effect of the nanocomposite's different components is responsible for its enhanced electrocatalytic performance.A density functional theory study revealed that the multi-interface and multicomponent heterostructure contribute to increased electrical conductivity and decreased energy barrier,resulting in superior electrocatalytic HER/OER *** study presents a novel vision for designing advanced electrocatalysts with superior performance in water *** composites have been utilized in water-splitting *** study investigates the use of the MW/HK/NiMn-S electrocatalyst for water splitting for the first time to indicate the synergistic effect between carbon-based materials along with layered double hydroxide compounds and porous compounds of *** unique features of each component in this composite can be an interesting topic in the field of water spl

关键词： bifunctional electrocatalyst electroactive sites multicomponent synergic effect water splitting

Imaging resolution of biocatalytic activity using nanoscale scanning electrochemical microscopy

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Nano Research 2018年第8期11卷 4232-4244页

作者： Jase M .Abad Alvaro Y. Tesio EmUiano Martinez-Perinan Felix Pariente Encamacion Lorenzo departamento de qufmica Analftica y Andlisis Instrumental Universidad Aut6noma de Madrid Cantoblanco 28049 Madrid Spain centro de Investigaci6n y desarrollo en Materiales Avanzados y Almacenamiento de Energfa de Jujuy-CIDMEJu (CONICET-UniversidadNacional de Jujuy) Centro de Desarrollo Tecnol6gico General Savio Av. Martijena s/n 4612-Palpald Jujuy Argentina Instituto Madrileno de Estudios Avanzados en Nanociencia (IMdeA-Nanociencia) Campus UAM Cantoblanco 28049 Madrid Spain

Scanning electrochemical microscopy represents a powerful tool for electro（chemical） characterization of surfaces, but its applicability has been limited in most cases at microscale spatial resolution, and the greatest challenge has been the scaling down to the nanoscale for fabrication and the use of nanometer-sized tips. Here, Pt nanoelectrodes with nanometer electroactive area were fabricated and employed for imaging a distribution of gold nanoparticles （AuNPs） and bioelectrocatalytic activity of a redox-active enzyme immobilized on gold surfaces.

关键词： scanning electrochemicalmicroscopy gold nanoparticle redox enzyme nanoelectrode lactate oxidase

New approaches for prevention and treatment of Alzheimer's disease:a fascinating challenge

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Neural Regeneration Research 2017年第3期12卷 405-406页

作者： Luca Piemontese Dipartimento Farmacia-Scienze del Farmaco UniversitàdegliStudi di Bari"Aldo Moro"BariItaly centro de Química estrutural Instituto Superior Técnico-Universidade Técnica de LisboaLisboaPortugal

The prevention and treatment of neurodegenerative diseases is the new challenge for pharmaceutical industry,but also for public institutions,physicians,patients,and their *** spread of these pathologies is,in fact,a real social problem,especially in the Western Countries where the population age is increasing and chronic diseases are more and more common.

关键词： PPARs New approaches for prevention and treatment of Alzheimer’s disease:a fascinating challenge

Syntheses,Crystal Structures and Luminescent Properties of Lead(Ⅱ) and Cadmium(Ⅱ) Coordination Polymers Constructed from Biphenyl-2,5,3′-tricarboxylate

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Chinese Journal of Structural Chemistry 2014年第6期33卷 888-896页

作者：高竹青李红晋 M.Kirillov Alexander 顾金忠 School of Chemical and Biological Engineering Taiyuan University of Science and Technology centro de Química estrutural Complexo I Instituto Superior TécnicoThe University of Lisbon College of Chemistry and Chemical Engineering Lanzhou University

Two coordination polymers, namely [Pb（Hbtc）（phen）]n（1） and {[Cd3（btc）2（H2O）4]·2H2O}n（2, H3btc = biphenyl-2,5,3＇-tricarboxylic acid, phen = 1,10-phenanthroline）, were assembled. Single-crystal X-ray diffraction studies show that compound 1 possesses a zigzag chain 1D coordination network, which is further extended into a 3D supramolecular architecture via O–H···O hydrogen bonds and π-π packing interactions. Compound 2 features a 3D open framework based on a tricadmium（II） subunit, generating a trinodal 4,4,6-connected net with the 4,4,6T24 topology defined by the point symbol of（44·62）3（46·69）2. Thermal stability and luminescent properties of both compounds were studied and discussed.

关键词： coordination polymer crystal structrue luminescent properties

Syntheses, Crystal Structures and Magnetic Properties of Cobalt(Ⅱ) and Manganese(Ⅱ) Coordination Polymers Constructed from 5-(Pyridin-4-yl)Isophthalate Ligands

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Chinese Journal of Structural Chemistry 2014年第4期33卷 626-634页

作者：高竹青李红晋 M.Kirillov Alexander 顾金忠 School of Chemical and Biological Engineering Taiyuan University of Science and Technology centro de Química estrutural Complexo I Instituto Superior TécnicoThe University of Lisbon Av. Rovisco Pais1049-001 Lisbon Portugal College of Chemistry and Chemical Engineering Lanzhou University

Two coordination polymers, namely {[Co（L）（H2O）]·H2O}n （1） and [Mn（L）（phen）]n （2, H2L = 5-（pyridin-4-yl）isophthalic acid, phen = 1,10-phenanthroline）, have been hydrothermally synthesized and characterized by elemental analysis, IR, TG, magnetic properties, and single-crystal X-ray diffraction. 1 belongs to the triclinic system, space group Pī with α = 7.2188（7）, b = 10.0835（8）, c = 10.2069（7）？, α = 113.713（7）, β = 99.490（7）, γ = 104.516（8）o, V = 628.24（9）？3, C13H11NCoO6, Mr = 336.16, Z = 2, Dc = 1.777 Mg/m3, μ（MoKα） = 1.395 mm–1, F（000） = 342, S = 1.041, the final R = 0.0381 and wR = 0.0819 for 3744 observed reflections （I 〉 2σ（I）） and R = 0.0448 and wR = 0.0874 for all data. 2 belongs to the monoclinic system, space group P2/c with α = 12.9185（3）, b = 10.4343（2）, c = 31.7650（6）？, β = 101.282（2）o, V = 4199.08（13）？3, C50H30N6Mn2O8, Mr = 952.68, Z = 4, Dc = 1.507 Mg/m3, μ（MoKα） = 5.447 mm–1, F（000） = 1944, S = 1.128, the final R = 0.1003 and wR = 0.1052 for 8247 observed reflections （I 〉 2σ（I）） and R = 0.2595 and wR = 0.2625 for all data. Single-crystal X-ray diffraction studies show that compound 1 features a 2D sheet structure based on a dicobalt（II） subunit, which is further extended into a 3D metal-organic supramolecular framework by O–H… hydrogen bond. Compound 2 also possesses a 2D sheet, which is held together into a 3D supramolecular architecture via C–H… hydrogen bond and π-π stacking interactions. Magnetic studies for compound 2 show antiferromagnetic coupling between the adjacent metal centers, with J = –11.8 cm–1 and g = 2.12 for 2.

关键词： coordination polymer crystal structrue magnetic properties