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Discovery and demonstration of small circular DNA molecules derived from Chinese tomato yellow leaf curl virus

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Chinese Science Bulletin 2000年第15期45卷 1417-1421页

作者： YIN Qinyan ZHANG Ying ZHANG Yuman LIU Yule ZHANG Zhongze TIAN Po Departmenl of Molecular Virology and Bioengineering Institute of MicrobiologyChinese Academy of SciencesBeijing 100080China Department of Microbiology Institute of Applied EcologyChinese Academy of SciencesShenyang 110015China

Tomato yellow leaf curl viruses belong to Begomoviruses of geminiviruses. In this work, we first found and demonstrated that the small circular DNA molecules were derived from Chinese tomato yellow leaf curl viruses (TYLCV-CHI). These small circular DNA molecules are about 1.3 kb, which are half the full-length of TYLCV-CHI DNA A. It was shown by sequence determination and analysis that there was unknown-origin sequence insertion in the middle of the small molecules. These sequences of unknown-origin were neither homologous to DNA A nor to DNA B, and were formed by recombination of virus DNA and plant DNA. Although various defective molecules contained different unknown-origin sequence insertion, all the molecules contained the intergenic region and part of the AC1 (Rep) gene. But they did not contain full ORF.

关键词： geminiviruses tomato yellow leaf curl viruses genome subgene.

Effect of cationic groups in organic sulfide electrolyte on the performance of CdS quantum dot sensitized solar cells

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Chinese Science Bulletin 2014年第25期59卷 3209-3215页

作者： Xin Li Heping Shen Wenli Wang Jianbao Li Hong Lin State Key Laboratory of New Ceramics & Fine Processing School of Material Science and Engineering TsinghuaUniversity National Engineering Laboratory for Modern Silk (Suzhou) College of Textile and Clothing Engineering of Soochow University Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources College of Materials Science and Chemical Engineering Hainan University

Two organic sulfide redox couples derived from2-mercapto-5-methyl-1,3,4-thiadiazole(McMT):tetrabutylammonium thiolate(McMT-TBA?)/disulfide dimer(BMT)and tetramethylammonium thiolate(McMTTMA?)/BMT were incorporated into quantum dots sensitized solar cells(QDSCs)as alternatives to the inorganic polysulfide electrolyte(Na2S/S).It was found in symmetrical cells test that the interfaces of the organic sulfide electrolytes/platinum counter-electrode have much lower charge transfer resistances as well as higher interface reaction rates compared with that for the inorganic ***,QDSCs based on organic sulfide electrolytes exhibited obviouslyhigher fill factors,open circuit photovoltages,and therefore higher conversion efficiency,thanks to the prohibited recombination and lower redox *** addition,by comparing and analyzing the performance of devices based on organic sulfide electrolytes with different cationic groups,it is found that cationic group TMA?with smaller size was favorable for the mass transport in the electrolyte,which explains the better photovoltaic performance of McMT-TMA?/BMT based solar cell than that of McMT-TBA?/BMT based ***,a power conversion efficiency(PCE)of 0.63%was achieved for QDSCs using McMT-(TMA?)/BMT redox couple as electrolyte,which was till now the highest for CdS QDSC based on organic sulfide electrolyte.

关键词：有机硫化物太阳能电池离子基团电解质量子点敏化影响点硫化镉

Targeting multiple epitopes on the spike protein:a new hope for COVID-19 antibody therapy

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Signal Transduction and Targeted Therapy 2020年第1期5卷 778-779页

作者： Yeping Sun Bostjan Kobe Jianxun Qi CAS Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyChinese Academy of Sciences100101 BeijingChina School of Chemistry and Molecular Biosciences University of QueenslandBrisbaneQLD 4072Australia Savaid Medical School University of the Chinese Academy of Sciences100049 BeijingChina

Lihong Liu et al.1 from Columbia University recently reported in Nature the isolation of a collection of 19 SARS-CoV-2-neutralizing monoclonal antibodies(mAbs)from five infected patients with high plasma virus-neutralizing *** antibodies can neutralize SARS-CoV-2 in vitro,and nine of them exhibited exquisite potency,with 50%virus-inhibitory concentrations of 9 ng/mL or *** strategy for isolation of these antibodies included sorting SARS-CoV-2 spike protein(S)-specific memory B cells by flow cytometry and single-cell sequencing.

关键词： al antibodies neutral

research on the solid particle erosion wear of pipe steel for hydraulic fracturing based on experiments and numerical simulations

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Petroleum Science 2024年第4期21卷 2779-2792页

作者： Si-Qi Yang Jian-Chun Fan Ming-Tao Liu De-Ning Li Jun-Liang Li Li-Hong Han Jian-Jun Wang Shang-Yu Yang Si-Wei Dai Lai-Bin Zhang State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research InstituteXi'an710077ShaanxiChina Key Laboratory of Oil and Gas Safety and Emergency Technology China University of PetroleumBeijing102249China Oil Production Technology research Institute of Liaohe Oilfield Company Panjin124010LiaoningChina Tianjin Gas Storage Branch PetroChina Dagang Oilfield CompanyTianjin300280China Petroleum Production Engineering research Institute Daqing Oilfield CompanyDaqing163712HeilongjiangChina

Erosion wear is a common failure mode in the oil and gas *** the hydraulic fracturing,the fracturing pipes are not only in high-pressure working environment,but also suffer from the impact of the high-speed solid particles in the fracturing *** such complex conditions,the vulnerable components of the pipe system are prone to perforation or even burst accidents,which has become one of the most serious risks at the fracturing ***,it is not yet fully understood the erosion mechanism of pipe steel for hydraulic ***,this article provides a detailed analysis of the erosion behavior of fracturing pipes under complex working conditions based on experiments and numerical ***,we conducted erosion experiments on AISI 4135 steel for fracturing pipes to investigate the erosion characteristics of the *** effects of impact angle,flow velocity and applied stress on erosion wear were comprehensively *** a particle impact dynamic model of erosion wear was developed based on the experimental parameters,and the evolution process of particle erosion under different impact angles,impact velocities and applied stress was *** combining the erosion characteristics,the micro-structure of the eroded area,and the micro-mechanics of erosion damage,the erosion mechanism of pipe steel under fracturing conditions was studied in detail for the first *** high-pressure operating conditions,it was demonstrated through experiments and numerical simulations that the size of the micro-defects in the eroded area increased as the applied stress increased,resulting in more severe erosion wear of fracturing pipes.

关键词： Erosion wear Applied stress Particle impact dynamics Erosion mechanism

Theoretical and experimental study of phase transformation and twinning behavior in metastable high-entropy alloys

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Journal of Materials Science & Technology 2022年第4期99卷 161-168页

作者： Zhibiao Yang Song Lu Yanzhong Tian Zijian Gu Jian Sun Levente Vitos Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Applied Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholm SE-10044Sweden Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Division of Materials Theory Department of Physics and Materials ScienceUppsala UniversityP.O.Box 516Uppsala SE-75120Sweden research Institute for Solid State Physics and Optics Wigner Research Center for PhysicsBudapest H-1525P.O.Box 49Hungary

Combined theoretical and experimental efforts are put forward to study the critical factors influencing deformation mode transitions in face-centered cubic *** revisit the empirical relationship between the stacking fault energy(SFE)and the prevalent deformation *** ab initio calculated SFE,we establish the critical boundaries between various deformation modes in the model Cr-Co-Ni solid solution *** agreement between theoretical predictions and experimental observations are *** findings shield light on applying quantum mechanical calculations in designing transformation-induced plasticity and twinning-induced plasticity mechanisms for achieving advanced mechanical properties.

关键词： Metastable alloys Stacking fault energy Twinning Martensitic transformation Co-Cr-Ni alloys

Rational Design of Biological Crystals with Enhanced Physical Properties by Hydrogen Bonding Interactions

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research 2023年第3期2023卷 659-668页

作者： Hui Yuan Bin Xue Dingyi Yang Sigal Rencus-Lazar Yi Cao Ehud Gazit Dan Tan Rusen Yang School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710126China The Shmunis School of Biomedicine and Cancer research George S.Wise Faculty of Life SciencesDepartment of Materials Science and EngineeringThe Iby and Aladar Fleischman Faculty of EngineeringTel Aviv UniversityTel Aviv 6997801Israel National Laboratory of Solid State Microstructure Department of PhysicsNanjing UniversityNanjing 210093JiangsuChina

Hydrogen bonds are non-covalent interactions and essential for assembling supermolecules into ordered structures in biological systems,endowing crystals with fascinating physical properties,and inspiring the construction of eco-friendly electromechanical ***,the interplay between hydrogen bonding and the physical properties is not fully understood at the molecular ***,we demonstrate that the physical property of biological crystals with double-layer structures could be enhanced by rationally controlling hydrogen bonding interactions between amino and carboxyl *** hydrogen bonding interactions result in various thermal,mechanical,electronic,and piezoelectric *** particular,the weak interaction between O and H atoms contributes to low mechanical strength that permits important ion displacement under stress,giving rise to a strong piezoelectric *** study not only reveals the correlation between the hydrogen bonding and physical properties in double-layer structures of biological crystals but also demonstrates the potential of these crystals as functional biomaterials for high-performance energy-harvesting *** calculations and experimental verifications in this work provide new insights into the rational design of biomaterials with desirable physical properties for bioelectrical devices by modulating intermolecular interactions.

关键词： bonding rational biomaterials

The high catalytic activity and strong stability of 3%Fe/AC catalysts for catalytic wet peroxide oxidation of m-cresol: The role of surface functional groups and FeO_(x) particles

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Chinese Journal of Chemical Engineering 2022年第4期35卷 105-114页

作者： Peiwei Han Chunhua Xu Yamin Wang Chenglin Sun Huangzhao Wei Haibo Jin Ying Zhao Lei Ma Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China

FeO;supported on activated carbon(AC) has been shown to be an ideal catalyst for catalytic wet peroxide oxidation(CWPO) due to its high CWPO reaction activity and stability. Although there have been some studies on the mechanism of Fe/AC catalysis in CWPO, the specific contribution of each component(surface oxygen groups and FeOxon AC) inside an Fe/AC catalyst and their corresponding reaction mechanism remain unclear, and the reaction stability of CWPO catalysts has rarely been discussed. Then the optimal CWPO catalyst in our laboratory, 3%Fe/AC, was selected.(1) By removing certain components on the AC through heat treatment, its contribution to the reaction and the corresponding reaction mechanism were investigated. With the aid of temperature-programmed desorption–mass spectrometry(TPD–MS) and the CWPO reaction, the normalized catalytic contributions of components were shown to be: 37.3%(carboxylic groups), 5.3%(anhydride), 19.3%(ether/hydroxyl),-71.4%(carbonyl groups) and 100%(FeOx),respectively. DFT calculation and EPR analysis confirmed that carboxylic groups and Fe_(2)O_(3) are able to activate the H_(2)O_(2) to generate·OH.(2) The catalysts at were characterized at different reaction times(0 h, 450 h, 900 h, 1350 h, and 1800 h) by TPD–MS and M?ssbauer spectroscopy. Results suggested that the number of carboxylic goups gradually increased and the size of paramagnetic Fe_(2)O_(3) particle crystallites gradually increased as the reactions progressed. The occurrence of strong interactions between metal oxides and AC was also confirmed. Due to these effects, the strong stability of 3%Fe/AC was further improved. Therefore, the reasons for the high activity and strong stability of 3%Fe/AC in CWPO were clearly shown. We believe that this work provides an idea of the removal of cresols from wastewater into the introduction to show the potential applications of CWPO.

关键词： Catalytic wet peroxide oxidation Fe/AC catalyst Surface functional groups Reaction mechanism

Quantum phase transitions in CePdAl probed by ultrasonic and thermoelectric measurements

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Chinese Physics B 2022年第11期31卷 470-473页

作者： Hengcan Zhao Meng Lyu Jiahao Zhang Shuai Zhang Peijie Sun Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

CePdAl has been recently recognized as a frustrated antiferromagnetic heavy-fermion compound with a pressureor field-tuned,extended quantum critical phase at zero *** characteristic signatures of the emerging quantum critical phase,which are expected to be distinct from those near a quantum critical point,remains *** this work,by performing ultrasonic and thermoelectric measurements down to very low temperatures in a^(3)He–^(4)He dilution refrigerator in the presence of magnetic field,we are able to obtain some crucial thermodynamic and thermal transport features of the quantum critical phase,including a frustration-related elastic softening detected by ultrasound and a Fermi-surface change probed by thermoelectric effect.

关键词： quantum phase transition ultrasound elastic constant thermoelectric power

The Mechanism on Cyclization, Debenzylation and Oxidation of 1-[1-(Benzyloxy)-3-methylnaphthalen-4-yloxy]propan-2-one

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Chinese Chemical Letters 2006年第6期17卷 769-772页

作者： Shi Liang HUANG Yi LUO Zhi Shu HUANG Xian Zhang BU Pei Qing LIU Lin MA Yue Ming LI Albert S. C. CHAN Lian Quan GU School of Chemistry and Chemical Engineering Sun Yat-Sen University Guangzhou 510275 School of Pharmaceutical Science Sun Yat-Sen University Guangzhou 510275 Department of Applied Bioiogy ＆ Chemical Technology The Hong Kong Polytechnic University Kowloon Hong Kong

1-[1-（Benzyloxy）-3-methylnaphthalen-4-yloxy]propan-2-one （la） took place a cyclization, debenzylation and oxidation to form 9-substitued benzo[de]chromene-7,8-dione （2a） and 5-benzyl-9-substitued benzo[de]chrome... 详细信息

关键词： Mansonone F cyclization selenium dioxide sigmatropic rearrangement.