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Agglutination of Helicobacter pylori coccoids by lectins

world Journal of Gastroenterology 2000年第2期6卷 202-209页

作者： Mar Mar Khin Jie Song Hua Han cong ng Torkel wadstrm Bow Ho Departments of Microbiology Faculty of MedicineNational University of Singapore5Science Drive 2Singapore 117597Republic of Singapore Department of Medical Microbiology Lund UniversitySolvegatan 23S 223 62 LundSweden

AIM To study the agglutination pattern ofHelicobacter pylori coccoid and spiral *** Assays of agglutination andagglutination inhibition were applied usingfifteen commercial *** Strong agglutination was observedwith mannose-specific Concanavalin A(Con A),fucose-specific Tetragonolobus purpureas(Lotus A)and N-acetyl glucosamine-specificTriticum vulgaris(wGA)*** andfucose specific lectins were reactive with allstrains of *** coccoids as compared to *** carbohydrates,glycoproteinsand mucin were shown to inhibit ***-agglutination ***-treatment ofthe bacterial cells with formalin and sulphuricacid did not alter the agglutination patterns ***,sodium periodate treatment ofbacterial cells were shown to inhibitagglutination reaction with Con A,Lotus A andwGA *** the contrary,enzymatictreatment of coccoids and spirals did not showmarked inhibition of ***,heating of *** cells at 60℃ for 1 hour was shown toaugment the agglutination with all of the *** The considerable differences inlectin agglutination patterns seen among the twodifferentiated forms of *** might beattributable to the structural changes during theevents of morphological transformation,resulting in exposing or masking some of the sugar residues on the cell *** ofvarious sugar residues on the cell wall of thecoccoids may allow them to bind to differentcarbohydrate receptors on gastric mucus andepithelial *** coccoids with adherencecharacteristics like the spirals could aid in thepathogenic process of Helicobacter *** may probably lead to different clinicaloutcome of *** associated gastroduodenaldisease.

关键词： Helicobacter pylori coccoids lectin gastric mucosa

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Single-metal-atom site with high-spin state embedded in defective BN nanosheet promotes electrocatalytic nitrogen reduction

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Nano Research 2021年第11期14卷 4211-4219页

作者： cong Fang wei An College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceShanghai201620China

Single-atom catalysts (SACs) especially supported on two-dimensional nitrogen-doped carbon substrate have been widely reported to be able to effectively promote electrocatalytic N_(2) reduction reaction (eNRR). The precise design of single-metal-atom active site (SMAS) calls for fundamental understanding of its working mechanism for enhanced eNRR performance. Herein, by means of density functional theory calculations, we theoretically investigate the eNRR performance of nine prototypical SMAS, namely, MN_(2)B_(2) (M: transition metals of IIIB, IVB and VB groups) which comprises of asymmetric ligands of N_(2)B_(2) embedded in defective BN nanosheet. Our results reveal the significant role of spin state of SMAS in tuning the potential-determining steps of eNRR, in which MN_(2)B_(2) site with higher spin magnetic moment (μ) is beneficial to reducing limiting potentials (U_(L)) of eNRR. Specially, CrN_(2)B_(2) (μ = 4μB), VN_(2)B_(2) (μ = 3μB) and MoN_(2)B_(2) (μ = 2μB) demonstrate high activity and selectivity to eNRR. The asymmetric ligands of N_(2)B_(2) are deemed to be superior over mono-symmetric ligands. More importantly, our results demonstrate that breaking (or deviating) of the scaling relations between key N-containing intermediates (*N_(2)H/*N_(2) and *NH2/*N_(2)) on MN_(2)B_(2) can be realized by enhancing spin state of SMAS which renders the active site a balanced N-affinity critical for efficient eNRR. This observation is validated by the calculated Sabatier volcano-shape relation between eNRR limiting potentials and N_(2) adsorption energy. Our study develops the guidance for catalyst design to boost eNRR performance by tuning the spin state of an active site.

关键词： electrocatalysis N_(2)reduction BN nanosheet spin state single-atom catalyst jdensity functional theory(DFT)

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Simulation of Cement Hydration and Porous Structures by the Hydration-Pixel Probability Model

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Journal of wuhan University of Technology(Materials Science) 2023年第5期38卷 1044-1055页

作者： TIAN cong wEI Xiaosheng School of Civil Engineering Architecture&The EnvironmentHubei University of TechnologyWuhan 430072China School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan 430072China

This research proposes a new pixel-based model called the hydration-pixel probability model which aims to simplify cement hydration as a probability *** hydration capacity of cement,the solution within pores,and the difiusion of solid particles are represented by three probability functions derived from experimental data obtained through electrical resistivity and hydration heat *** principle of the model is relatively simple,and the parameters have clear physical *** this research,the porous structures of difierent cement pastes with w/c ratios of 0.3,0.4,and 0.5 are *** results indicate that the porosity of the cement paste decreases during the first few hours,followed by a rapid decline,and eventually reaches a steady *** porosity of the paste decreases as w/c ratio decreases,and the rate of decrease is more rapid in the early *** to the porosity curves,the average degree of hydration and depth of hydration can be *** simulation results show that the hydration degree of paste composed of irregular particles is higher than that of the paste composed of round *** trend in the development of the average hydration depth is similar to that of the average hydration *** analyzing the average growth rate of the hydration depth,it is observed that there are two peaks in the curves,which correspond to the three characteristic points in the electrical resistivity test.

关键词： cement hydration model porosity hydration degree simulation

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Venturi-type fluidic sampler for liquid-solid mixtures

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Particuology 2012年第3期10卷 283-291页

作者： cong Xu Binbin Liu Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

Static-type samplers are required for sampling corrosive, toxic, high-temperature, or radioactive liquid-solid fluids. we have designed a compact reverse flow diverter pumping system for transferring liquid-solid mixtures. In accordance with the Venturi principle, an acceptable volume of liquid-solid fluid is automatically collected into a sampling bottle. The effects of sampling needle sizes, sectional area of the T-section, solid concentration, and liquid viscosity on the performance of fluidic samplers were experi- mentally investigated. The sample volume increased upon the reduction of the sampling needle length and the increase of the sectional area of the T-section, but decreased with the increase of solid concentration and liquid viscosity. Unbiased samples of acceptable volume were produced by the proposed fluidic sampler, even at 10.21 mPa s liquid viscosity, 35 wt% solid concentration, and 6.74 m sampling height.

关键词： SamplerLiquid-solid Reverse flow diverterVenturi principle Maintenance free

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Microstructure of a Ti–50wt% Ta alloy produced via laser powder bed fusion

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Acta Metallurgica Sinica(English Letters) 2020年第7期33卷 981-990页

作者： Lei-Lei Xing cong-cong Zhao Hao Chen Zhi-Jian Shen wei Liu School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Jihua Laboratory 13th FloorChengye buildingNanping West Road No.13GuichengNanhai districtFoshan cityGuangdong province 528000China Arrhenius Laboratory Department of Materials and Environmental ChemistryStockholm University10691StockholmSweden

Ti-Ta alloys have been widely studied for biomedical applications due to their high biocompatibility and corrosion *** this work,nearly fully dense and in situ alloyed Ti-50 wt% Ta samples were fabricated by the laser powder bed fusion(LPBF) of mechanically mixed *** increased exposure time,and thereby increased laser energy density,insoluble Ta particles were almost dissolved,and a Ti-50 wt% Ta alloy was *** and dendritic structures were formed due to constitutional undercooling,which was caused by the high cooling rate of LPBF *** retained βphases and α " phases were observed in the LPBFed Ti-50 wt% Ta *** α" phase was found at the boundary of the cellular structures,where the tantalum content was not high enough to suppress the bcc lattice transition completely but could suppress the β phase→α’ phase transition.

关键词： alloy Microstructure corrosion

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Gut microbiota-derived metabolites in the regulation of host immune responses and immune-related inflammatory diseases

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Cellular & Molecular Immunology 2021年第4期18卷 866-877页

作者： wenjing Yang Yingzi cong Department of Microbiology and Immunology University of Texas and 2Department of Pathology University of Texas Medical BranchGalvestonTXUSA

The gut microbiota has a critical role in the maintenance of immune *** in the intestinal microbiota and gut microbiota-derived metabolites have been recognized in many immune-related inflammatory *** metabolites can be produced by gut microbiota from dietaiy components or by the host and can be modified by gut bacteria or synthesized de novo by gut *** microbiota-derived metabolites influence a plethora of immune cell responses,including T cells,B cells,dendritic cells,and *** e of these metabolites are involved in the pathogenesis of immune-related inflammatory diseases,such as inflammatory bowel diseases,diabetes,rheumatoid arthritis,and systemic lupus ***,we review the role of microbiota-derived metabolites in regulating the functions of different immune cells and the pathogenesis of chronic immune-related inflammatory diseases.

关键词： gut microbiota metabolites T cells B cells autoimmune diseases

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The Simultaneous Fractional Dimension of Graph Families

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Acta Mathematica Sinica,English Series 2023年第8期39卷 1425-1441页

作者： cong X.KAng Iztok PETERIN Eunjeong YI Texas A&M University at Galveston GalvestonTX 77553USA University of Maribor FEECS Smetanova 172000 MariborSlovenia

For a connected graph G with vertex set V,let RG{x,y}={z∈V:dG(x,z)≠dG(y,z)}for any distinct x,y∈V,where dG(u,w)denotes the length of a shortest uw-path in *** a real-valued function g defined on V,let g(V)=∑s∈V g(s).Let C={G_(1),G_(2),...,G_(k)}be a family of connected graphs having a common vertex set V,where k≥2 and|V|≥3.A real-valued function h:V→[0,1]is a simultaneous resolving function of C if h(RG{x,y})≥1 for any distinct vertices x,y∈V and for every graph G∈*** simultaneous fractional dimension,Sdf(C),of C is min{h(V):h is a simultaneous resolving function of C}.In this paper,we initiate the study of the simultaneous fractional dimension of a graph *** obtain max1≤i≤k{dimf(Gi)}≤Sd_(f)(C)≤min{∑k i=1 dimf(Gi),|V|/2},where both bounds are *** characterize C satisfying Sdf(C)=1,examine C satisfying Sdf(C)=|V|/2,and determine Sdf(C)when C is a family of vertex-transitive *** also obtain some results on the simultaneous fractional dimension of a graph and its complement.

关键词： Metric dimension fractional metric dimension resolving function simultaneous(metric)dimension simultaneous fractional(metric)dimension

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Scheduling a Single-Arm Multi-Cluster Tool with a Condition-Based Cleaning Operation

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IEEE/CAA Journal of Automatica Sinica 2023年第10期10卷 1965-1983页

作者： Qinghua Zhu Hongpeng Li cong w.ng Yan Hou School of Computer Science and Technology Guangdong University of TechnologyGuangzhou 510006China Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewarkNJ 07102-1982 USA

As wafer circuit widths shrink less than 10 nm,stringent quality control is imposed on the wafer fabrication processes. Therefore, wafer residency time constraints and chamber cleaning operations are widely required in chemical vapor deposition, coating processes, etc. They increase scheduling complexity in cluster tools. In this paper, we focus on scheduling single-arm multi-cluster tools with chamber cleaning operations subject to wafer residency time constraints. when a chamber is being cleaned, it can be viewed as processing a virtual wafer. In this way, chamber cleaning operations can be performed while wafer residency time constraints for real wafers are not violated. Based on such a method, we present the necessary and sufficient conditions to analytically check whether a single-arm multi-cluster tool can be scheduled with a chamber cleaning operation and wafer residency time constraints. An algorithm is proposed to adjust the cycle time for a cleaning operation that lasts a long cleaning ***, algorithms for a feasible schedule are also *** an algorithm is presented for operating a multi-cluster tool back to a steady state after the cleaning. Illustrative examples are given to show the application and effectiveness of the proposed method.

关键词： Chamber cleaning multi-cluster tools scheduling semiconductor manufacturing

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Efficient nonlocal two-step entanglement concentration protocol for three-level atoms in an arbitrary less-entangled w state using cavity input-output process

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Science China(Physics,Mechanics & Astronomy) 2014年第8期57卷 1511-1518页

作者： ZHAng Ru ZHOU SuHua CAO cong Department of Communications & Information Engineering Century College Beijing University of Posts and Telecommunications School of Science Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

we present an efficient two-step entanglement concentration protocol(ECP)for three-level atoms trapped in one-sided optical micro-cavities in an arbitrary three-particle less-entangled w state,using the coherent state input-output process in low-Q cavity quantum electrodynamics *** each step of the new proposed protocol,one of the three remote users prepares the auxiliary coherent optical pulses to perform cavity input-output process and then utilizes the standard homodyne measurement to discriminate the final outgoing coherent *** both of the two steps are successful,remote parties can deterministically concentrate the less-entangled w state atoms to a standard maximally entangled w *** with previous ECPs for w state,this protocol has some advantages and can be widely used in current quantum repeater and some quantum information processing tasks.

关键词： entanglement concentration protocol w state cavity input-output process

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Study on SGDC Electrolyte Film Prepared by RF Magnetron Sputtering

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稀有金属材料与工程 2006年第A03期35卷 501-503页

作者： cong w.ng Lihai Xu weihua Tang Center of Condensed Matter Physics and Material Physics School of Science Beihang University Beijing 100083 China Department of Physics Center for Optoelectronics Materials and Devices Zhejiang Sci-Tech UniversityXiasha College Park Hangzhou 310018 China

Sm and Gd co-doped Ceria (SGDC:Sm_(0.1)Gd_(0.1)Ce_(0.8)O_(1.90)) films as the electrolytes were investigated for the IT-SOFCs (intermediate-temperature solid oxide fuel cells).SGDC sensing films were successfully prepared on the Al_2O_3 substrates by RF-magnetron *** relationship between sputtering parameters and film microstructure was discussed, and the optimum parameters were *** crystal structure analysis and surface morphologic observation of the SGDC films were carried out through X-ray diffraction (XRD) and scanning electron microscopy (SEM).The oxygen ion conductivity of the SGDC film was evaluated by AC impedance spectroscopy at the different *** XRD analysis shows that the SGDC films grow preferentially along the (111) compact *** crystallinity of the SGDC films is enhanced with the increase of the RF sputtering power from 150 w to 250 *** oxygen ion conductivity of the SGDC was measured at the temperature from 600℃to 800℃in air by AC impedance *** result shows that a high oxygen ion conductivity of 2.44×10^(-2) ***^(-1) was achieved at 800℃.

关键词： solid oxide fuel cell electrolyte film Sm0.1Gd0.1Ce0.8O1.90 RF magnetron sputtering

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