检索结果-南通市图书馆

Red wine and green tea reduce H pylori- or VacA-induced gastritis in a mouse model

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第3期13卷 349-354页

作者： Paolo Ruggiero Giacomo Rossi Francesco Tombola Laura Pancotto Laura Lauretti Giuseppe Del Giudice Mario Zoratti Novartis Vaccines & Diagnostics s.r.l. Research Center SienaItaly Department of Veterinary Science University of Camerino Matelica Italy Department of Biomedical Sciences University of PadovaItaly CNR Institute of Neuroscience Section for Biomembranes Padova Italy cnr institute of Neuroscience Section for Biomembranes Padova Italy

AIM： To investigate whether red wine and green tea could exert anti-H pylori or anti-VacA activity in vivo in a mouse model of experimental infection. METHODS： Ethanol-free red wine and green tea concentrates were administered orally as a mixture of the two beverages to H pylori infected mice, or separately to VacA-treated mice. Gastric colonization and gastric inflammation were quantified by microbiological, histopathological, and immunohistochemical analyses.RESULTS： In H pylori-infected mice, the red wine and green tea mixture significantly prevented gastritis and limited the localization of bacteria and VacA to the surface of the gastric epithelium. Similarly, both beverages significantly prevented gastric epithelium damage in VacA-treated mice; green tea, but not red wine, also altered the VacA localization in the gastric epithelium. CONCLUSION： Red wine and green tea are able to prevent H pylori-induced gastric epithelium damage, possibly involving VacA inhibition. This observation supports the possible relevance of diet on the pathological outcome of Hpylori infection.

关键词： VacA H pylori Gastritis Wine Tea Polyphenols

Enhancement of luminescence intensity and spectroscopic analysis of Eu^(3+) activated and Li^+ charge-compensated Bi_2O_3 nanophosphors for solid-state lighting

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

Journal of Rare Earths 2019年第4期37卷 356-364页

作者： S.Ashwini S.C.Prashantha RamachANDra Naik H.Nagabhushana Department of Physics Channabasaveshwara Institute of Technology Research Center Department of Science East West Institute of Technology Department of Physics New Horizon College of Engineering cnr Rao Center for Advanced Materials Tumkur University

The present work reports the synthesis, characterization, photoluminescence and photocatalytic activity of Eu^(3+)(1 mol%-11 mol%) doped and Li^+(0.5 mol%-5 mol%) co-doped Bi_2 O_3 nanophosphors(NPs) by sonochemical method. The average particle size was estimated using powder X-ray diffraction(PXRD)and transmission electron microscopy(TEM) and is found to be in the range of 30-35 nm. The scanning electron microscopy(SEM) images were highly dependent on sonication time and concentration of epigallocatechin gallate(EGCG) bio-surfactant. The energy gap of doped and co-doped Bi_2 O_3 nanophosphors was estimated using Kubelka-Munk(K-M) function and is found to be in the range of2.9-3.08 eV. The effect of Li+ co-doping on luminescence of optimized Bi_2 O_3:Eu^(3+) was studied and is found about more than 3 fold enhancement of emission intensity. Judd-Ofelt parameters(Ω_2, Ω_4 and Ω_6).transition probabilities(A_T), quantum efficiency(η), luminescence lifetime(τ_(rad)), color chromaticity coordinates(CIE) and correlated color temperature(CCT) values were estimated from the emission spectra and are discussed in detail. The estimated CIE chromaticity co-ordinates are very close to the NTSC(National Television Standard Committee) standard value of red emission. The synthesized NPs show excellent photocatalytic activity of acid red-88 under UV-light irradiation, which can degrade 98.1% in60 min. The decreasing electron-hole pair recombination rate with quick electron transfer ability is predominantly ascribed to the balance between crystallite size, morphology, band gap, defects, surface area, etc. These results show a light for the use of sonochemical route of Bi_2 O_3:Eu^(3+):Li^+ in solid state display and photocatalytic applications.

关键词： Bi2O3:Eu3+:Li+ Sonochemical Photoluminescence CIE n CCT Photocatalysis Rare earths

Numerical simulation of the self-propulsive motion of a fishlike swimming foil using the δ^+-SPH model

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2018年第2期8卷 115-125页

作者： Peng-Nan Sun Andrea Colagrossi A-Man Zhang College of Shipbuilding Engineering Harbin Engineering University cnr-INSEAN Marine Technology Research Institute

The present work is dedicated to the application of the recently developed （δ＋ -SPH） scheme to the self-propulsive fishlike swimming hydrodynamics. In the numerical method, a particle shifting technique （PST） is implemented in the framework of δ-SPH, combining with an adaptive particle refinement （APR） which is a numerical technique adopted to refine the particle resolution in the local region and de-refine particles outside that region. This comes into being the so-called δ＋- SPH scheme which contributes to higher numerical accuracy and efficiency. In the fishlike swimming modeling, a NACA0012 profile is controlled to perform a wavy motion mimicking the fish swimming in water. Thanks to the mesh-free characteristic of SPH method, the NACA0012 profile can undergo a wavy motion with large amplitude and move forward freely, avoiding the problem of mesh distortion. A parallel staggered algorithm is adopted to perform the fluidstructure interaction between the foil and the surrounding fluid. Two different approaches are adopted for the fishlike swimming problem. In Approach 1, the foil is fixed and flaps in a free stream and in Approach 2, the wavy foil can move forward under the self-driving force. The numerical results clearly demonstrate the capability of the δ＋ -SPH scheme in modeling such kind of self-propulsive fishlike swimming problems.

关键词： Smoothed particle hydrodynamics δ+-SPH Fishlike swinuning Wavy foil Swinuning propulsion

GALT Protein Database, a Bioinformatics Resource for the Management and Analysis of Structural Features of a Galactosemia-related Protein and Its Mutants

在线全文

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2009年第1期7卷 71-76页

作者： Antonio d’Acierno Angelo Facchiano Anna Marabotti Laboratory of Bioinformatics and Computational Biology Institute of Food Science Italian National Research Council (CNR)

We describe the GALT-Prot database and its related web-based application that have been developed to collect information about the structural and functional effects of mutations on the human enzyme galactose-l-phosphate uridyltransferase （GALT） involved in the genetic disease named galactosemia type I. Besides a list of missense mutations at gene and protein sequence levels, GALT-Prot reports the analysis results of mutant GALT structures. In addition to the structural information about the wild-type enzyme, the database also includes structures of over 100 single point mutants simulated by means of a computational procedure, and the analysis to each mutant was made with several bioinformatics programs in order to investigate the effect of the mutations. The web-based interface allows querying of the database, and several links are also provided in order to guarantee a high integration with other resources already present on the web. Moreover, the architecture of the database and the web application is flexible and can be easily adapted to store data related to other proteins with point mutations. GALT-Prot is freely available at http：//***/GALT/.

关键词： database mutation homology modeling galactosemia GALT enzyme

Recent advances concerning polyurethane in leather applications:an overview of conventional and greener solutions

在线全文

学校读者我要写书评

暂无评论

Collagen and Leather 2023年第1期5卷 1-15页

作者： Jize Liu Federica Recupido Giuseppe Cesare Lama Maria Oliviero Letizia Verdolotti Marino Lavorgna institute for Polymers Composites and Biomaterials(IPCB-CNR)Piazzale Enrico Fermi 180055 Portici(Naples)Italy

Leather is one of the most popular products across globe and holds a significant place in the economy,while the pollution,associated to traditional leather industry,is far away on the"green chemistry"*** this sense,polyurethanes,which exhibit tunable chemical structures by selecting suitable precursors,can fit specific requirements,and the developments of green strategies make them important candidates for leather *** mini review briefly outlines the recent development of conventional(petrol-based)and sustainable polyurethanes in the leather industry,including their design and properties,in applications such as synthetic leather and surface-finishing(coatings/binders).Finally,outlooks of the future tendency,including more environmental-friendly strategies,bio-sourced/recycled materials and development of high-value multifunctional leather materials,are also here proposed.

关键词： Conventional leather Artificial leather polyurethane-synthetic leather polyurethane-based binders polyurethane-based-materials Polyurethane-based-coatings

Surface and transport properties of Cu-Sn-Ti liquid alloys

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

Rare Metals 2006年第5期25卷 457-468页

作者： R.Novakovic E.Ricci1 S.Amore T.Lanata National Research Council (cnr)–institute for Energetics and Interphases (IENI) Via De Marini6-16149-GenoaItaly National Research Council (cnr)–institute for Energetics and Interphases (IENI) Via De Marini6-16149-GenoaItalyDCCI-University of Genoa & Genoa Research Unit of National Consortium of Materials Science & Technology (INSTM)Via Dodecaneso31 - 16146-GenoaItaly National Research Council (cnr)–institute for Energetics and Interphases (IENI) Via De Marini6-16149-GenoaItalyDIAM-University of GenoaVia Opera Pia15 - 16145-GenoaItaly

The lack of experimental data and / or limited experimental information concerning both surface and transport properties of liquid alloys often require the prediction of these quantities. An attempt has been made to link the thermophysical properties of a ternary Cu-Sn-Ti system and its binary Cu-Sn, Cu-Ti and SnoTi subsystems with the bulk through the study of the concentration dependence of various thermodynamic, structural, surface and dynamic properties in the frame of the statistical mechanical theory in conjunction with the quasi-lattice theory （QLT）. This formalism provides valuable qualitative insight into mixing processes that occur in molten alloys.

关键词： equilibrium thermodynamics and statistical mechanics surface segregation surface tension surface thermodynamics (including phase transitions) liquid surfaces copper tin titanium alloys

Enhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic effect

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2023年第12期17卷 1962-1972页

作者： Gianluca Landi Giulia Sorbino Fortunato Migliardini Giovanna Ruoppolo Almerinda Di Benedetto institute of Sciences and Technologies for Sustainable Energy and Mobility-cnr Naples 80125Italy Department of Chemical Materials and Production EngineeringUniversity of Naples Federico ⅡNaples 80125Italy

Within the“hydrogen chain”,the high-temperature water gas shift reaction represents a key step to improve the H2 yield and adjust the H2/COx ratio to fit the constraints of downstream *** the commercial application of the high-temperature water gas shift,novel catalysts characterized by higher intrinsic activity(especially at low temperatures),good thermal stability,and no chromium content are *** this work,we propose bimetallic iron-copper catalysts supported on ceria,characterized by low active phase content(iron oxide+copper oxide<5 wt%).Fresh and used samples were characterized by inductively coupled plasma mass spectrometry,X-ray diffraction,nitrogen physisorption,scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy,and temperature programmed reduction in hydrogen to relate physicochemical features and catalytic *** sample with iron/copper≈1 and 4 wt%active phase content showed the best catalytic properties in terms of turnover frequency,no methane formation,and *** unique properties were due to both strong iron-copper interaction and strong metal-support interaction,leading to outstanding redox behavior.

关键词： water gas shift iron copper bimetallic catalysts ceria hydrogen

Speckle spatial correlations aiding optical transmission matrix retrieval:the smoothed Gerchberg–Saxton single-iteration algorithm

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2022年第10期10卷 2349-2358页

作者： DANIELE ANCORA LORENZO DOMINICI ANTONIO GIANFRATE PAOLO CAZZATO MILENA DE GIORGI DARIO BALLARINI DANIELE SANVITTO LUCA LEUZZI Department of Physics Universitàdi Roma la SapienzaPiazzale Aldo Moro 5I-00185 RomeItaly institute of Nanotechnology Consiglio Nazionale delle Ricerche(CNR-NANOTEC)Via MonteroniI-73100 LecceItaly institute of Nanotechnology Soft and Living Matter LaboratoryConsiglio Nazionale delle Ricerche(CNR-NANOTEC)Piazzale Aldo Moro 5I-00185 RomeItaly

The estimation of the transmission matrix of a disordered medium is a challenging problem in disordered ***,its reconstruction relies on a complex inversion that aims at connecting a fully controlled input to the deterministic interference of the light field scrambled by the *** the moment,iterative phase retrieval protocols provide the fastest reconstructing frameworks,converging in a few tens of *** the knowledge of speckle correlations,we construct a new phase retrieval algorithm that reduces the computational cost to a single *** being faster,our method is practical because it accepts fewer measurements than state-of-the-art *** to reducing computation time by one order of magnitude,our result can be a step forward toward real-time optical imaging that exploits disordered devices.

关键词： optical matrix algorithm

New application of open source data and Rock Engineering System for debris flow susceptibility analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2021年第12期18卷 3200-3217页

作者： Sabrina BONETTO Pietro MOSCA Federico VAGNON Davide VIANELLO Department of Earth Science University of TorinoTorino 10125Italy institute of Geosciences and Earth Resources National Research Council(CNR)Torino 10125Italy

This research describes a quantitative,rapid,and low-cost methodology for debris flow susceptibility evaluation at the basin scale using open-access data and *** proposed approach can aid decision makers in land management and territorial planning,by first screening for areas with a higher debris flow *** environmental predisposing factors,namely,bedrock lithology,fracture network,quaternary deposits,slope inclination,and hydrographic network,were selected as independent parameters and their mutual interactions were described and quantified using the Rock Engineering System(RES)*** each parameter,specific indexes were proposed,aiming to provide a final synthetic and representative index of debris flow susceptibility at the basin *** methodology was tested in four basins located in the Upper Susa Valley(NW Italian Alps)where debris flow events are the predominant natural *** proposed matrix can represent a useful standardized tool,universally applicable,since it is independent of type and characteristic of the basin.

关键词： Debris flow Interaction matrix Rock Engineering System(RES) Susceptibility analysis Open source data Debris flow predisposing factors