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Total Synthesis of a Hyperbranched N-Linked Hexasaccharide Attached to ATCV-1 Major Capsid Protein without Precedent

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Chinese Journal of Chemistry 2019年第1期37卷 42-48页

作者： Yong-Shi wang Yong Wu De-cai Xiong Xin-shan Ye State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityXue Yuan Road No.38Beijing 100191China State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 200031China

Summary of main observation and conclusion The N-glycans attached to some chloroviruses comprise a hyperbranched core structure without *** are interested in the chemical synthesis of the hexasaccharide attached to ATCV-1 (Acanthocystis turfacea Chlorella virus 1)for its distinct *** exploring four routes,the target hexasaccharide 2 was successfully synthesized for the first time in overall 10% yield over 8 steps from thioglycoside building *** synthetic protocol is characterized by the three-component one-pot glycosylation and the regioselective glycosylation *** disclosed synthetic approach to this new type of N-glycans will facilitate the in-depth understanding of their biological functions.

关键词： chemical routes functions

Multi-strategies Boosted Mutative Crow Search Algorithm for Global Tasks:Cases of Continuous and Discrete Optimization

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Journal of Bionic Engineering 2022年第6期19卷 1830-1849页

作者： Weifeng shan Hanyu Hu Zhennao cai Huiling Chen Haijun Liu Maofa wang Yuntian Teng School of Emergency Management Institute of Disaster PreventionLangfang065201China Institute of Geophysics China Earthquake AdministrationBeijing100081China Department of Computer Science and Artificial Intelligence Wenzhou UniversityWenzhou325035China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic TechnologyGuilin541004China

Crow Search Algorithm(CSA)is a swarm-based single-objective optimizer proposed in recent years,which tried to inspire the behavior of crows that hide foods in different locations and retrieve them when *** original version of the CSA has simple parameters and moderate ***,it often tends to converge slowly or get stuck in a locally optimal region due to a missed harmonizing strategy during the exploitation and exploration ***,strategies of mutation and crisscross are combined into CSA(CCMSCSA)in this paper to improve the performance and provide an efficient optimizer for various optimization *** verify the superiority of CCMSCSA,a set of comparisons has been performed reasonably with some well-established metaheuristics and advanced metaheuristics on 15 benchmark *** experimental results expose and verify that the proposed CCMSCSA has meaningfully improved the convergence speed and the ability to jump out of the local *** addition,the scalability of CCMSCSA is analyzed,and the algorithm is applied to several engineering problems in a constrained space and feature selection *** results show that the scalability of CCMSCSA has been significantly improved and can find better solutions than its competitors when dealing with combinatorial optimization *** proposed CCMSCSA performs well in almost all experimental ***,we hope the researchers can see it as an effective method for solving constrained and unconstrained optimization problems.

关键词： Crow search algorithm Feature selection Global optimization Metaheuristic algorithms Engineering problems Bionic algorithm

Synthesis of temperature and salt resistance silicon dots for effective enhanced oil recovery in tight reservoir

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Petroleum Science 2024年第5期21卷 3390-3400页

作者： Cheng Liu Biao Zhou Bing-shan wang Huan wang Qing You Guang Zhao cai-Li Dai Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering China University of GeosciencesBeijing100083China School of Energy Resources China University of GeosciencesBeijing100083China Chengdu Huayang Town Chengdu Natural Gas Chemical General Factory Chengdu610213SichuanChina School of Petroleum Engineering China University of PetroleumQingdao266580ShandongChina

The intensive development of tight reservoirs has positioned them as a strategic alternative to conventional oil and gas resources. Existing enhanced oil recovery(EOR) methods struggle to effectively exploring reservoir oil, resulting in low recovery rates. Novel and effective means of developing tight reservoirs are urgently needed. Nanomaterials have shown promising applications in improving water flooding efficiency, with in-depth research into mechanisms that lower injection pressure and increase water injection volumes. However, the extent of improvement remains limited. In this study, a silicon quantum dots(Si-QDs) material was synthesized via a hydrothermal synthesis method and used to prepare a nanofluid for the efficient recovery of tight reservoir. The Si-QDs, with an approximate diameter of 3 nm and a spherical structure, were surface functionalized with benzenesulfonic acid groups to enhance the performance. The developed nanofluid demonstrated stability without aggregation at 120℃ and a salinity of 60000 mg/L. Core flooding experiments have demonstrated the attractive EOR capabilities of Si-QDs, shedding light of the EOR mechanisms. Si-QDs effectively improve the wettability of rocks, enhancing the sweeping coefficient of injected fluids and expanding sweeping *** this sweeping region, Si-QDs efficiently stripping adsorbed oil from the matrix, thus increasing sweeping efficiency. Furthermore, Si-QDs could modify the state of pore-confined crude oil, breaking it down into smaller particles that are easier to displacement in subsequent stages. Si-QDs exhibit compelling EOR potential, positioning them as a promising approach for effectively developing tight oil reservoirs.

关键词： Silicon quantum dots Tight reservoir Microfluidic Micro-CT Enhanced oil recovery Temperature and salt resistance

Effect of Cr on Characteristic of Rust Layer Formed on Low Alloy Steel in Flow-accelerated Corrosion Environment

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Journal of Iron and Steel Research International 2016年第6期23卷 602-607页

作者： Feng CHAI shan JIANG cai-fu YANG Department of Engineering Steels Central Iron and Steel Research Insititute

The flow-accelerated corrosion experiments were carried out to research the effect of Cr on the rust layers formed on the carbon steel and Cr-containing steel,as well as the structure of rust layer of the two experimental *** influence of Cr on the flow-accelerated corrosion resistance and the corrosion morphology of inner rust layer formed on the Cr-containing steel were studied by the methods of polarization curves,scanning electron microscope,transmission electron microscope,and X-ray photoelectron *** distribution of Cr and its form of existence in the inner rust layer were *** results show that corroded mass loss of Cr-containing steel is lower than that of carbon steel and its inner rust layer is *** exists in the form of Fe2CrO4 and is enriched in the inner rust *** concentration could make the inner rust layer exhibit the tendency of *** phenomenon is related to fine *** inner rust layer becomes more compact because of the formation of fine Fe2CrO4,and the protectiveness of inner rust layer could be improved remarkably.

关键词： accelerated photoelectron amorphous remarkably steels finer enriched cathodic hence attributed

Meta-analysis of QTL for Fusarium head blight resistance in Chinese wheat landraces

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The Crop Journal 2019年第6期7卷 784-798页

作者： Jin cai shan wang Zhenqi Su Tao Li Xianghui Zhang Guihua Bai Institute of Germplasm Resources and Biotechnology and Jiangsu Provincial Key Laboratory of Agrobiology Jiangsu Academy of Agricultural SciencesNanjing 210014JiangsuChina Department of Agronomy Kansas State UniversityManhattanKS 66506USA Institute of Cereal and Oil Crops Hebei Academy of Agricultural and Forestry SciencesShijiazhuang 050035HebeiChina Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology Yangzhou UniversityYangzhou 225009JiangsuChina College of Plant Science Jilin UniversityChangchun 130062JilinChina United State Department of Agriculture-Agricultural Research Service Hard Winter Wheat Genetics Research UnitManhattanKS 66506USA

Epidemics of Fusarium head blight(FHB), incited by Fusarium graminearum Schwabe, in wheat cause significant reductions in grain yield and quality. Numerous quantitative trait loci(QTL) for FHB resistance have been reported from Chinese sources. However, the relationships among QTL from different landraces have not been characterized. We earlier mapped QTL for FHB resistance using low-density maps developed from five recombinant inbred line(RIL) populations involving Chinese landraces ‘Haiyanzhong’(HYZ),‘wangshuibai’(WSB), ‘Baishanyuehuang’(BSYH), ‘Huangfangzhu’(HFZ), and‘Huangcandou’(HCD) as FHB resistant parents. In this study, we used maps of single nucleotide polymorphisms(SNP) developed from the five populations and identified 31 QTL on 16 chromosomes;10 QTL were new. We constructed a consensus map and identified six meta-QTL(MQTL) and SNP within the MQTL regions using meta-analysis. Two of the MQTL were on chromosome 3 BS(3 BSd and 3 BSc), and one on each of chromosomes 3A, 2D, 3D,and 4D. Twenty-two SNP closely linked to MQTL were converted into breeder friendly Kompetitive Allele Specific Polymerase Chain Reaction(KASP) assays, which should be useful for marker-assisted selection in breeding programs.

关键词： Genotyping-by-sequencing FHB resistance KASP Meta-analysis of QTL Single nucleotide polymorphism Triticum aestivum

Surface micro-arrays enhancing electromagnetic interference shielding of polydimethylsiloxane/multiwalled carbon nanotubes nanocomposites

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Nano Research 2025年第1期18卷 508-519页

作者： Ke Jiang Zhi Chen Ji Yu Chen Zheng shan Huang Ming wang Chongqing Key Laboratory of Soft-Matter Material Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China School of Mechanics Civil Engineering and ArchitecturesNorthwestern Polytechnical UniversityXi’an 710072China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang 515200China

Herein,the electromagnetic shielding performance of surface concave-convex(SC)and zig-zag micro-arrays was studied by using a simulation prediction and a three-dimensional(3D)printing custom ***,surface stripe concaveconvex(SSC)and surface cylindrical concave-convex(SCC)micro-arrays with or without zig-zag micro-arrays are designed,and their shielding performance is simulated in multi-bands(C-,X-band).The multiwalled carbon nanotubes/polydimethylsiloxane composites(MWCNT/PDMS)with different SC structures and different electrical conductivity are molded in acrylonitrile-butadiene-styrene copolymer(ABS)molds which are printed by a 3D *** results show that the electromagnetic interference shielding effectiveness(EMI SE)of the samples can be enhanced by constructing the SC micro-arrays with zig-zag micro-arrays,and improving with the increase of conductivity and *** addition,the shielding mechanism of the SC-MWCNT/PDMS composites is investigated and discussed by an electromagnetic simulation.

关键词： surface micro-arrays electrical properties electromagnetic interference(EMI)shielding three-dimensional(3D)printing

Simulations of electron zebra stripes in the inner radiation belt using a composite empirical electric field model

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Science China Earth Sciences 2025年第1期 27-38页

作者： Ziyang wang Ying LIU Qiugang ZONG Hong ZOU Yuguang YE Xuzhi ZHOU Chao YUE shan wang Institute of Space Physics and Applied Technology Peking University State Key Laboratory of Lunar and Planetary Science Macau University of Science and Technology

The phenomenon termed “zebra stripes” manifests as regular patterns in the energy-space(L shell) spectrum of energetic electrons(ranging from tens to hundreds ke V) within the inner radiation belt. These structures exhibit drift-periodic behavior and commonly arise from large-scale electric field perturbations near the substorm onsets. In this study, we introduce a composite electric field model and replicate the formation, structure, and evolution of zebra stripes using a bounce-averaged test particle code under this electric field model. High-resolution measurements of energetic electrons obtained from the Van Allen Probes and the recently launched Macao Science Satellites-1 are used as initial conditions and served to validate our test particle simulations. Comparative analyses between observed data and simulations demonstrate our test particle method's efficacy in capturing zebra stripes' general behavior. Moreover, the composite model proves capable of reproducing realistic variations in the electric field within the inner radiation belt to a certain extent. Nevertheless, subtle differences emerge in the flux strength and the positions of stripes. These disparities primarily stem from limitations inherent in the electric field model and the initial conditions of the simulation. Acknowledging that the model represents an average case, it is conceivable that real-world scenarios may deviate from the average, thereby introducing variations in the observed phenomena.

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Hierarchically 1D CdS decorated on 2D perovskite-type La_(2)Ti_(2)O_(7) nanosheet hybrids with enhanced photocatalytic performance

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Rare Metals 2021年第5期40卷 1067-1076页

作者： Liang Mao Xiao-Yan cai Ming-shan Zhu School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipment China University of Mining and TechnologyXuzhou 221116China School of Environment Jinan UniversityGuangzhou 511443China

In this paper,a heterojunction of hierarchically one-dimensional(1D)cadmium sulfide(CdS)nanowires decorated on the two-dimensional(2D) La_(2)Ti_(2)O_(7) (LTO)has been fabricated by a simple two-step hydrothermal *** structure,morphology and surface chemical composition of CdS/LTO were studied by a variety of characterizations,in which the X-ray photoelectron spectroscopy(XPS)results showed a strong interaction between CdS and LTO through S-O *** typeⅡband alignment of CdS/LTO for favorable electron transfer from CdS to LTO and hole transfer from LTO to CdS was clarified by ultraviolet-visible(UV-Vis)diffuse reflectance spectroscopy and Mott-Schottky(M-S)plot *** the absence of any co-catalyst,H2 production from water splitting and Rhodamine B(RhB)decomposition in aqueous solution were carried out to evaluate the photocatalytic activities,showing that the photocatalytic performance of CdS/LTO was superior to that of pure LTO and CdS under visible light and simulated *** optimal CdS content in the CdS/LTO system was determined to be 7.5 wt%.The present results show an effective pathway to design a 1D/2D heterojunction photocatalyst in the face of overwhelming problems of energy crisis and environmental pollution.

关键词： Cadmium sulfide Lanthanum titanium oxide Heterojunction H_(2)production Dyes degradation

Functionalizable and Recyclable Aliphatic Polycarbonates Derived from Biomass Feedstocks and CO_(2)

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Chemical Research in Chinese Universities 2023年第5期39卷 809-815页

作者： WU Yanchen FAN Huazhong shan Siyi wang Siqi cai Zhongzheng ZHU Jian-Bo National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan) College of ChemistrySichuan UniversityChengdu 610064P.R.China

Two bio-based seven-membered cyclic carbonate monomers M1 and M2 were synthesized in three steps from myrcene,which could produce polycarbonates via ring-opening polymerization using metal or organic *** functionalizable olefin moieties in resulting polycarbonates have driven post-polymerization modifications via radical cross-linking and hydrogenation,enabling the resulting polymers with tunable thermal *** importantly,the chemical recycling of P(M)s was achieved through"monomer→polymer⇄dimer",which presented a platform for the synthesis of chemically recyclable biobased polycarbonates.

关键词： Biomass CO_(2) Polycarbonate Functionalization Chemical recyclability