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Stereoselective Synthesis of a Tetrasaccharide Fragment from RhamnogalacturonanⅡSide Chain A

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Chinese Journal of Chemistry 2022年第15期40卷 1799-1806页

作者： Jin-Cai Lei Yuan-Yuan Jiang Yi-Fei Xia Qing Fang Shi-Chao Duan Yu-xiong Ruan Jin-Song Yang Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of Pharmacyand State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengduSichuan 610041China

Comprehensive Summary An efficient synthesis of a complex tetrasaccharide fragment 1 structurally related to rhamnogalacturonan ll side chain A has been accomplished through a stepwise glycosylation *** involved in the synthesis include the facile construction of the sterically crowded L-fucopyranose core and the stereoselective formation of two 1,2-cis-glycosidic *** 3,4-disubstituted L-fucopyranoside structure was successfully constructed through a'counterclockwise'glycosylation sequence,namely,the less reactive axial 4-OH group of the central fucose unit was glycosylated first,then the ***,a 2-pyridinecarbonyl-assistedα-D-xylosylation was developed to synthesize theα-D-xylopyranosidic linkage and a 3,4-O-benzoyl-controlledα-L-galactosylation reaction was usedforthe stereoselective synthesis of the correspondingα-L-galactopyranosidic linkage.

关键词： RhamnogalacturonanⅡ Glycosylation Synthesis Oligosaccharide Diastereoselectivity

Antimicrobial power of biosynthesized Ag nanoparticles using refined Ginkgo biloba leaf extracts

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Frontiers of Materials Science 2022年第2期16卷 109-118页

作者： Wenbo ZHUANG Dafeng HU Xudong ZHANG Kai xiong Xiao DING Jian LU Yong MAO Peng YANG Chao LIU Yanfen WAN National Center for International Research on Photoelectric and Energy Materials Advanced Computing CenterMaterials Genome InstituteSchool of Materials and EnergyYunnan UniversityKunming 650091China Kunming Institute of Botany Chinese Academy of SciencesKunming 650201China Department of Nuclear Medicine Yunnan Cancer Hospital&The Third Affiliated Hospital of Kunming Medical UniversityKunming 650118China

Silver nanoparticles(Ag NPs),relative to existing antibacterial agents,are more effective,less toxic and more economical,and have shown enormous potential for the nanomedicine *** this work,we report a‘green’method for the rapid and efficient synthesis of Ag NPs using Ginkgo biloba extracts as reducing agent and capping *** properties of Ag NPs against fungi and bacteria were *** results showed that the Ginkgo biloba extracts are crucial for the preparation of uniform and monodispersed Ag *** prepared Ag NPs exhibited remarkable antibacterial *** minimum inhibitory concentrations of Ag NPs for Escherichia coli and Pseudomonas aeruginosa were 0.044 and 0.088μg·mL−1,***,Ag NPs exhibited excellent bactericidal performance against MDR-Pseudomonas *** was found that the effect of the antibacterial activity of Ag NPs on Escherichia coli and Staphylococcus aureus was tightly related to the reactive oxygen species *** research provides guidelines for the efficient green synthesis of Ag NPs and its antibacterial applications.

关键词： Ginkgo biloba extract silver nanoparticle green synthesis antibacterial application

Sox9^(+) cells are required for salivary gland regeneration after radiation damage via the Wnt/β-catenin pathway

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Journal of Genetics and Genomics 2022年第3期49卷 230-239页

作者： Xiuyun Xu Gan xiong Ming Zhang Jiaxiang Xie Shuang Chen Kang Li Jingting Li Yong Bao Cheng Wang Demeng Chen Department of Oral and Maxillofacial Surgery Hospital of StomatologyGuanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat-sen UniversityGuangzhouGuangdong 510030China Center for Translational Medicine Institute of Precision MedicineThe First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510080China Department of Radiation Oncology The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong 510080China

Radiotherapy for head and neck cancer can cause serious side effects, including severe damage to the salivary glands, resulting in symptoms such as xerostomia, dental caries, and oral infection. Because of the lack of long-term treatment for the symptoms of xerostomia, current research has focused on finding endogenous stem cells that can differentiate into various cell lineages to replace lost tissues and restore functions. Here, we report that Sox9^(+)cells can differentiate into various salivary epithelial cell lineages under homeostatic conditions. After ablating Sox9^(+) cells, the salivary glands of irradiated mice showed more severe phenotypes and the reduced proliferative capacity. Analysis of online single-cell RNAsequencing data reveals the enrichment of the Wnt/β-catenin pathway in the Sox9^(+) cell ***, treatment with a Wnt/β-catenin inhibitor in irradiated mice inhibits the regenerative capability of Sox9^(+) cells. Finally, we show that Sox9^(+) cells are capable of forming organoids in vitro and that transplanting these organoids into salivary glands after radiation partially restored salivary gland *** results suggest that regenerative therapy targeting Sox9^(+) cells is a promising approach to treat radiation-induced salivary gland injury.

关键词： Radiation-induced salivary gland injury Sox9 Wnt/β-catenin pathway Regeneration Organoids

An Analysis of the Eddy Kinetic Energy Budget of a Southwest Vortex during Heavy Rainfall over South China

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Atmospheric and Oceanic Science Letters 2009年第3期2卷 135-141页

作者： FU Shen-Ming SUN Jian-Hua ZHAO Si-xiong LI Wan-Li Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Cold andArid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

Based on the 6-hour-interval reanalysis data with 1°× 1°resolution from the National Center for Environmental Prediction/the National Center for Atmospheric Research （NCEP/NCAR）, the eddy kinetic energy （EKE） budget of a southwest vortex （SWV） that caused heavy rainfall in Guangxi over South China （from 1200 UTC 11 to 0000 UTC 13 June） is calculated. The results are as follows：（a） The SWV is a kind of subtropical vortex, with characteristics of both an extratropical vortex and a tropical vortex. （b） In the case examined, large-scale circulation and other perturbation fields contributed to the formation and development of the SWV. （c） When the SWV moved from weak large-scale circulation EKE areas to strong ones, the EKE of the SWV increased, and vice versa. （d） Sub-grid processes and frictional dissipation were the main sinks of the SWV EKE, which contributed to the decay of the SWV. （e） The residual term （RES） and the Total （composite effect of all right hand side （rhs） terms except the RES in the EKE equation） varied almost in the same tendency, which kept the EKE varying in a moderate way. （f） The EKE between 550 hPa and 850 hPa increased most intensively, corresponding to the vertical stretching of the SWV.

关键词： SWV EKE barotropical transition baroclinic transition

Research on Optical Properties and Micro-processing Characteristics of Collodion Thin Film

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Defence Technology（防务技术） 2013年第3期9卷 167-170页

作者： Chang-long CAI xiong HAN Xiao-ling NIU Wei-guo LIU Micro-Optoelectrical System Laboratory Xi'an Technological University

Colorless and transparent thin films of collodion are prepared on silicon wafers and K9 optical glass substrates by using spin-coating *** visible light transmittance,IR absorption spectra and optical constants of collodion thin film are measured by UV-3501Spectrophotometer,Fourier transform infrared spectrometer(FTIR)and spectroscopic *** measured results show that its average visible light transmittance is 91.9%,and its average infrared absorptivity is better than 0.69/*** the visible light region,the refractive index of collodion thin film changes in the range of 1.5—1.53,which accords with normal *** collodion films are etched using oxygen gas *** surface morphology and thickness of etched thin film are measured by the polarizing microscope and MP-100S thickness measurement system,*** results show that the collodion thin film is etched out in the oxygen gas plasma.

关键词：光学性能火棉胶薄膜加工特性傅里叶变换红外光谱仪可见光透射率厚度测量系统红外吸收光谱

Mooring observed mode-2 internal solitary waves in the northern South China Sea

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Acta Oceanologica Sinica 2020年第11期39卷 44-51页

作者： Liang Chen Xuejun xiong Quanan Zheng Yeli Yuan Long Yu Yanliang Guo Guangbing Yang Xia Ju Jia Sun Zhenli Hui First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Founctional Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Department of Atmospheric and Oceanic Science University of MarylandCollege ParkMaryland 20742USA

The mode-2 internal solitary waves(ISWs)generated by mode-2 internal tide(IT)are identified by mooring observations in the northern South China Sea(SCS)from 2016 to *** mode-2 ISWs with a re-appearance period of 24.9 h observed on 29 and 30 July 2016 are characterized by type-b *** occurred when the isotherms compressed obviously in the vertical *** decomposition of IT horizontal currents shows that the vertical compression of the isotherms is mainly caused by diurnal mode-2 *** analysis of the role of the density stratification reveals that a deeper and thinner pycnocline is favorable for generation of mode-2 ISWs rather than pycnocline *** comparing the mode-2 nonlinear,dispersion coefficients and the Ursell numbers calculated based on the stratification associated with different kinds of ITs with the observation results,it is shown that the diurnal mode-2 IT plays a crucial role in the generation of the mode-2 *** the diurnal mode-2 IT interacts with the semidiurnal IT and causes a deeper and thinner pycnocline,the mode-2 ISWs are easily excited.

关键词： mode-2 internal solitary waves South China Sea internal tide mooring observation

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小波滤波中的阈值研究

电力自动化设备 2008年第10期28卷 113-115页

作者：熊科江西工业贸易职业技术学院机电技术系江西南昌330366

小波阈值滤波是利用小波变换,除去小幅度的小波系数,收缩或保留幅度较大的小波系数,抑制信号中的噪声。实验证明,利用半软阈值滤波,若下阈值取得过小,不利除噪,取得过大,又不利保留信号中的细节;若上阈值取得过大,将产生较大的偏差,取... 详细信息

小波阈值滤波是利用小波变换,除去小幅度的小波系数,收缩或保留幅度较大的小波系数,抑制信号中的噪声。实验证明,利用半软阈值滤波,若下阈值取得过小,不利除噪,取得过大,又不利保留信号中的细节;若上阈值取得过大,将产生较大的偏差,取得过小,又将产生较大的方差。滤波阈值的确定是小波阈值滤波的关键问题,直接决定着滤波效果。对小波阈值滤波的上、下阈值选取进行了深入研究,通过实验总结,建立了求解最优上、下阈值的目标函数,利用扫描计算,得出了最优上、下阈值与噪声均方差之间的关系,上阈值系数约为4.3,下阈值系数约为3.7。并进行了仿真验证,滤波效果明显。

关键词：小波变换阈值滤波均方差

Applications of AI in advanced energy storage technologies

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Energy and AI 2023年第3期13卷 1-2页

作者： Rui xiong Hailong Li Quanqing Yu Alessandro Romagnoli Jakub Jurasz Xiao-Guang Yang Department of Vehicle Engineering School of Mechanical EngineeringBeijing Institute of TechnologyNo.5 South Zhongguancun StreetHaidian DistrictBeijing100081China School of Business Society and EngineeringMalardalen UniversityVasteras 72123Sweden School of Automotive Engineering Harbin Institute of TechnologyWeihaiShandong264209China School of Mechanical and Aerospace Engineering Nanyang Technological University639798Singapore Faculty of Environmental Engineering Wrocław University of Science and Technology50-370WrocławPoland

The prompt development of renewable energies necessitates advanced energy storage technologies,which can alleviate the intermittency of renewable *** this regard,artificial intelligence(AI)is a promising tool that provides new opportunities for advancing innovations in advanced energy storage technologies(AEST).Given this,Energy and AI organizes a special issue entitled“Applications of AI in Advanced Energy Storage Technologies(AEST)”.

关键词： prompt energy AI

Annealing-free alcohol-processable MoO_(X) anode interlayer enables efficient light utilization in organic photovoltaics

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Journal of Energy Chemistry 2021年第10期30卷 141-146,I0004页

作者： Ke Yang Shanshan Chen Yongli Zhou George Omololu Odunmbaku Zhenghong xiong Qianguang Yang Ming Wang Zhipeng Kan Zeyun Xiao Shirong Lu Kuan Sun School of Energy&Power Engineering MOE Key Laboratory of Low-Grade Energy Utilization Technologies and SystemsCQU-NUS Renewable Energy Materials&Devices Joint LaboratoryChongqing UniversityChongqing 400044China Thin-film Solar Technology Research Center Chongqing Institute of Green and Intelligent TechnologyChongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400714China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060GuangdongChina

Molybdenum oxide(MoO_(x))is a commonly used hole extraction material in organic *** MoO_(x) interlayer is deposited typically via thermal evaporation in *** meet the need for rollto-roll manufacturing,solution processing of MoO_(x) without post-annealing treatment is ***,we demonstrate an effective approach to produce annealing-free,alcohol-processable MoO_(x) anode interlayers,namely S-MoO_(x),by utilizing the bis(catecholato)diboron(B_(2) Cat_(2))molecule to modify the surface oxygen sites in MoO_(x).The formation of surface diboron-oxygen complex enables the alcohol solubility of S-MoO_(x).An enhanced light utilization is realized in the S-MoO_(x)-based organic *** affords a superior short-circuit current density(Jsc)close to 26 mA cm^(-2) and ultimately a high power-conversion efficiency(PCE)of 15.2%in the representative PM6:Y6 based inverted OPVs,which is one of the highest values in the inverted OPVs using an as-cast S-MoO_(x) anode interlayer.

关键词： Solution processable Annealing free Molybdenum oxide Organic solar cell