检索结果-南通市图书馆

Antibacterial mechanism of kojic acid and tea polyphenols against Escherichia coli O157:H7 through transcriptomic analysis

引用

Food Science and Human Wellness 2024年第2期13卷 736-747页

作者： Yilin Lin Ruifei Wang Xiaoqing Li Keren Agyekumwaa Addo Meimei Fang yehui zhang Yigang Yu School of Food Sciences and Engineering South China University of TechnologyGuangzhou 510640China Sericulture&Agri-food Research Institute Guangdong Academy of Agricultural Sciences Key Laboratory of Functional FoodsMinistry of Agriculture and Rural AffairsGuangdong Key Laboratory of Agricultural Products ProcessingGuangzhou 510610China Research Center of Food Safety and Detection College of Food Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

Escherichia coli O157:H7 is one of the major foodborne pathogenic bacterial that cause infectious diseases in humans.The previous found that a combination of kojic acid and tea polyphenols exhibited better activity against E.coli O157:H7 than using either alone.This study aimed to explore responses underlying the antibacterial mechanisms of kojic acid and tea polyphenols from the gene level.The functional enrichment analysis by comparing kojic acid and tea polyphenols individually or synergistically against E.coli O157:H7 found that acid resistance systems in kojic acid were activated,and the cell membrane and genomic DNA were destructed in the cells,resulting in“oxygen starvation”.The oxidative stress response triggered by tea polyphenols inhibited both sulfur uptake and the synthesis of ATP,which affected the bacteria's life metabolic process.Interestingly,we found that kojic acid combined with tea polyphenols hindered the uptake of iron that played an essential role in the synthesis of DNA,respiration,tricarboxylic acid cycle.The results suggested that the iron uptake pathways may represent a novel approach for kojic acid and tea polyphenols synergistically against E.coli O157:H7 and provided a theoretical basis for bacterial pathogen control in the food industry.

关键词： Kojic acid Tea polyphenols Antibacterial mechanism Escherichia coli O157:H7 RNA-seq

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Characteristics of atmospheric boundary layer structure and its influencing factors under different sea and land positions in Europe

引用

Earth and Planetary Physics 2023年第2期7卷 257-268页

作者： yehui zhang XinPeng Yong HouFu Zhou HaiYang Gao Na Yang Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources Nanjing University of Information Science and TechnologyNanjing 210044China Anhui Institute of Meteorology Sciences Anhui Key Laboratory of Atmospheric Science and Satellite Remote SensingHefei 230031China School of Atmospheric Physics Nanjing University of Information Science and TechnologyNanjing 210044China

This study identifies quantitatively the dominant contributions of meteorological factors on the development of the boundary layer heights(BLH)in the European region,based on 32 years(1990-2021)of radiosonde observations.The spatial variability of the BLH is further discussed by location,by classifying recording stations as inland,coastal,or bay.We find that the BLH in Europe varies considerably from day to night and with the seasons.Nighttime BLH is higher in winter and lower in summer,with the highest BLH recorded at coastal stations.Daytime BLH at coastal stations shows a bimodal structure with peaks in spring and autumn;at inland and bay stations,daytime BLH is lower in winter and higher in summer.The daily amplitudes of BLH at the inland and bay stations are stronger than those at coastal stations.Based on our multiple linear regression analysis and our decoupling analysis of temperature and specific humidity,we report that the development of the nighttime BLH at all types of stations is strongly dominated by the variations of surface wind speed(and,at coastal stations,wind directions).The main contributors to daytime BLH are the near-surface temperature variability at most coastal and inland stations,and,at most bay stations,the variation of the near-surface specific humidity.

关键词： atmospheric boundary layer height wind surface temperature specific humidity decoupling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electron doping induced stable ferromagnetism in two-dimensional GdI_(3)monolayer

引用

Frontiers of physics 2023年第4期18卷 209-216页

作者： Rong Guo Yilv Guo yehui zhang Xiaoshu Gong Tingbo zhang Xing Yu Shijun Yuan Jinlan Wang Key Laboratory of Quantum Materials and Devices of Ministry of Education School of PhysicsSoutheast UniversityNanjing 211189China

As a two-dimensional material with a hollow hexatomic ring structure,Néel-type anti-ferromagnetic(AFM)GdI_(3)can be used as a theoretical model to study the effect of electron doping.Based on first-principles calculations,we find that the Fermi surface nesting occurs when more than 1/3 electron per Gd is doped,resulting in the failure to obtain a stable ferromagnetic(FM)state.More interestingly,GdI_(3)with appropriate Mg/Ca doping(1/6 Mg/Ca per Gd)turns to be half-metallic FM state.This AFM–FM transition results from the transfer of doped electrons to the spatially expanded Gd-5d orbital,which leads to the FM coupling of local half-full Gd-4f electrons through 5d–4f hybridization.Moreover,the shortened Gd–Gd length is the key to the formation of the stable ferromagnetic coupling.Our method provides new insights into obtaining stable FM materials from AFM materials.

关键词： two-dimensional materials electronic structure magnetism

来源：

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

Efficient charge transfer in WS2/WxMo1-xS2 heterostructure empowered by energy level hybridization

引用

Science China(Information Sciences) 2023年第2期66卷 219-226页

作者： Xuhong AN yehui zhang Yuanfang YU Weiwei ZHAO Yutian YANG Xianghong NIU Xuan LUO Junpeng LU Jinlan WANG Zhenhua NI School of Physics and Key Laboratory of MESMS of the Ministry of Education Southeast University New Energy Technology Engineering Laboratory of Jiangsu Province and School of Science Nanjing University of Posts and Telecommunications Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences

Photoinduced charge transfer(CT) is decisive to the efficiency and speed of photoelectric conversion in two-dimensional(2D) van der Waals(vd Ws) heterostructures. Generally, CT rate enhancement is realized by increasing the band offset(BO). In this study, we propose that a fast and efficient CT can be realized via strong hybridization of energy levels in 2D vd Ws heterostructures with minimal BO. Firstprinciples calculations reveal that the smallest energy difference between conduction-band edges and minimal BO in the WS2/WxMo1-xS2(x = 0.78) heterostructure yields the strong hybridization of energy levels and then results in ultrafast CT(2.7 ps). Experimental results agree with theoretical calculations. The photoluminescence of WS2is quenched in the WS2/WxMo1-xS2(x = 0.78) heterostructure, attributable to the strong hybridization-induced fast and efficient CT. This study provides insights into the mechanism of CT in heterostructures and offers new strategies to create superior optoelectronic devices with fast and efficient photoelectric conversion.

关键词： van der Waals heterostructure band offset hybridization strength charge transfer photoluminescence quenching

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Diurnal variability of the planetary boundary layer height estimated from radiosonde data

引用

Earth and Planetary Physics 2020年第5期4卷 479-492页

作者： Jie Gu yehui zhang Na Yang Rui Wang School of Hydrology and Water Resources Nanjing University of Information Science and TechnologyNanjing 210044China State Oceanic Administration Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China

Diurnal variations in the planetary boundary layer height(PBLH)at different latitudes over different surface characteristics are described,based on 45 years(1973−2017)of radiosonde observations.The PBLH is determined from the radiosonde data by the bulk Richardson number(BRN)method and verified by the parcel method and the potential temperature gradient method.In general,the BRN method is able to represent the height of the convective boundary layer(BL)and neutral residual layer cases but has relatively large uncertainty in the stable BL cases.The diurnal cycle of the PBLH over land is quite different from the cycle over ocean,as are their seasonal variations.For stations over land,the PBLH shows an apparent diurnal cycle,with a distinct maximum around 15:00 LT,and seasonal variation,with higher values in summer.Compared with the PBLH over land,over oceans the PBLH diurnal cycles are quite mild,the PBLHs are much lower,and the seasonal changes are less pronounced.The seasonal variations in the median PBLH diurnal cycle are positively correlated with the near-surface temperature and negatively correlated with the near-surface relative humidity.Finally,although at most latitudes the daytime PBLH exhibits,over these 45 years,a statistically significant increasing trend at most hours between 12:00 LT and 18:00 LT over both land and ocean,there is no significant trend over either land or ocean in the nighttime PBLH for almost all the studied latitudes.

关键词： planetary boundary layer height diurnal cycle radiosonde

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

融合Stackelberg博弈和联邦学习的多星协作频谱认知方法研究

引用

通信学报 2024年第2期45卷 90-105页

作者：丁晓进徐叶辉包文张更新南京邮电大学通信与信息工程学院江苏南京210003 南京邮电大学物联网学院江苏南京210003

针对低成本和小型化低轨卫星的监测角度和方向分辨率相对较低、处理能力和峰值功率受限等因素造成单颗低轨卫星频谱认知能力弱的问题,提出了融合Stackelberg博弈和联邦学习的多星协作频谱认知方法。首先,结合各频谱认知卫星的可用算力... 详细信息

针对低成本和小型化低轨卫星的监测角度和方向分辨率相对较低、处理能力和峰值功率受限等因素造成单颗低轨卫星频谱认知能力弱的问题,提出了融合Stackelberg博弈和联邦学习的多星协作频谱认知方法。首先,结合各频谱认知卫星的可用算力、认知性能、处理与传输时延等特性,建立面向多频谱认知任务的协作卫星选择与算力资源分配算法;其次,基于所选择的节点和所分配的算力,设计低复杂度的多星协作频谱认知策略,其可自动辨识频谱空洞、检测干扰和识别调制模式。仿真实验结果表明,相比于单节点认知方法,所设计多星协作频谱认知策略能显著提升认知性能,且相比于对比模型,所设计策略中的模型可在不损失性能时,模型的参数量和浮点运算量降低分别可达96.69%和93.32%。

关键词：卫星频谱认知多星协作 Stackelberg博弈联邦学习

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

激光通信中光学天线的隔离度研究

引用

航天返回与遥感 2024年第2期45卷 83-91页

作者：马业辉闫钧华张超刘剑峰南京航空航天大学空间光电探测与感知工业和信息化部重点实验室南京211106 南京航空航天大学航天学院南京211106 北京空间机电研究所北京100094

伴随激光通信组网和轻量化的需求以及收发一体化模式的普遍应用,实现光学天线发射和接收之间的高效隔离至关重要,为此文章对同轴天线与离轴天线的隔离度进行了研究。首先采用Code V光学设计软件分别设计了1550 nm波段的同轴天线和离轴... 详细信息

伴随激光通信组网和轻量化的需求以及收发一体化模式的普遍应用,实现光学天线发射和接收之间的高效隔离至关重要,为此文章对同轴天线与离轴天线的隔离度进行了研究。首先采用Code V光学设计软件分别设计了1550 nm波段的同轴天线和离轴两反式天线,视场角为±1.5 mrad,接近衍射极限;再根据杂散光散射模型,利用分析软件进行光线追迹,模拟出隔离度;然后分别研究了在同轴天线次镜中心放置遮拦来规避开孔风险,以及在离轴天线中调整离轴量和曲率半径的方法,使同轴和离轴天线的隔离度分别提升至−69 dB和−89 dB。结果表明,上述方法均能够有效提升光学天线的隔离度。

关键词：激光通信光学天线隔离度杂散光

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamic structure change of Cu nanoparticles on carbon supports for CO_(2) electro-reduction toward multicarbon products

引用

InfoMat 2021年第11期3卷 1285-1294页

作者： Qiang Li yehui zhang Li Shi Mingliang Wu Yixin Ouyang Jinlan Wang School of Physics Southeast UniversityNanjingChina

Cu nanoparticles with different sizes,morphology,and surface structures exhibit distinct activity and selectivity toward CO_(2) reduction reaction,while the reactive sites and reaction mechanisms are very controversial in experiments.In this study,we demonstrate the dynamic structure change of Cu clusters on graphite-like carbon supports plays an important role in the multicarbon production by combining static calculations and ab-initio molecular dynamic simulations.The mobility of Cu clusters on graphite is attributed to the near-degenerate energies of various adsorption configurations,as the interaction between Cu atoms and surface C atoms is weaker than that of Cu-Cu bonds in the tight cluster form.Such structure change of Cu clusters leads to step-like irregular surface structures and appropriate interparticle distances,increasing the selectivity of multicarbon products by reducing the energy barriers of C-C coupling effectively.In contrast,the large ratio of edge and corner sites on Cu clusters is responsible for the increased catalytic activity and selectivity for CO and H_(2) compared with Cu(100)surface,instead of hydrocarbon products like methane and ethylene.The detailed study reveals that the dynamic structure change of the catalysts results in roughened surface morphologies during catalytic reactions and plays an essential role in the selectivity of CO_(2) electro-reduction,which should be paid more attention for studies on the reaction mechanisms.

关键词： ab-initio calculations CO_(2)electro-reduction reaction Cu clusters dynamic structure change multicarbon products

来源：

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

The ANIP1-OsWRKY62 module regulates both basal defense and Pi9-mediated immunity against Magnaporthe oryzae in rice

引用

Molecular Plant 2023年第4期16卷 739-755页

作者： Xuetao Shi yehui Xiong Kai zhang Yinshan zhang Junqi zhang Lili zhang Yutao Xiao Guo-Liang Wang Wende Liu State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBejing 100193China Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricutural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China Department of Plant Pathology The Ohio State UniversityColumbusOH 43210USA

During effector-triggered immunity(ETI)against the devastating rice blast pathogen Magnaporthe oryzae,Pi9 functions as an intracellular resistance protein sensing the pathogen-secreted effector AvrPi9 in rice.Importantly,the underlying recognition mechanism(s)between Pi9 and AvrPi9 remains elusive.In this study,We identified a rice ubiquitin-like domain-containing protein(UDP),AVRPI9-INTERACTING PROTEIN 1(ANP1),which is directly targeted by AvrPi9 and also binds to Pi9 in plants.Phenotypic analysis of anip1 mu-tants and plants overexpressing ANIP1 revealed that ANIP1 negatively modulates rice basal defense against M.oryzae.ANiP1 undergoes 26S proteasome-mediated degradation,which can be blocked by both AvrPi9 and Pi9.Moreover,ANIP1 physically associates with the rice WRKY transcription factor OsWRKY62,which also interacts with AvrPi9 and Pi9 in plants.In the absence of Pi9,ANIP1 negatively regulates OsWRKY62 abundance,which can be promoted by AvrPi9.Accordingly,knocking out of OsWRKY62 in a non-Pi9 back-ground decreased immunity against M.oryzae.However,we also observed that OsWRKY62 plays negative roles in defense against a compatible M.oryzae strain in Pi9-harboring rice.Pi9 binds to ANiP1 and OsWRKY62 to form a complex,which may help to keep Pi9 in an inactive state and weaken rice immunity.Furthermore,using competitive binding assays,we showed that AvrPi9 promotes Pi9 dissociation from ANiP1,which could be an important step toward ETI activation.Taken together,our results reveal an immune strategy whereby a UDP-WRKY module,targeted by a fungal effector,modulates rice immunity in distinct ways in the presence or absence of the corresponding resistance protein.

关键词： AvrPi9 ANIP1 OsWRKY62 Pi9 rice blast disease immunity

来源：

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

电子鼻结合生物胺分析淡水鱼贮藏过程中的品质变化

引用

现代食品科技 2024年第1期40卷 137-148页

作者：刘琳焦文娟赵甜甜张友胜周芳南海军张业辉黄文广东药科大学中药学院广东广州510006 广东省农业科学院蚕业与农产品加工研究所农业农村部功能食品重点实验室广东省农产品加工重点实验室广东广州510610 岭南现代农业科学与技术广东省实验室广东广州510642 广东省农业科学院水产研究所广东广州510645

以三种淡水鱼(草鱼、罗非鱼和鳙鱼)为研究对象,分析了25℃和4℃贮藏条件下色泽、pH值、硫代巴比妥酸反应物质(TBARS)、总挥发性盐基氮(TVB-N)等理化指标的变化,并结合电子鼻和生物胺(BAs)探究在贮藏过程中新鲜度的变化。结果表明,25℃和... 详细信息

以三种淡水鱼(草鱼、罗非鱼和鳙鱼)为研究对象,分析了25℃和4℃贮藏条件下色泽、pH值、硫代巴比妥酸反应物质(TBARS)、总挥发性盐基氮(TVB-N)等理化指标的变化,并结合电子鼻和生物胺(BAs)探究在贮藏过程中新鲜度的变化。结果表明,25℃和4℃贮藏条件下,随着贮藏时间的延长,b*值、总色差(ΔE)、生物胺含量、TVB-N和TBARS含量逐渐增大,pH值呈现出先降后升的规律,而L*值和a*值呈现下降趋势。25℃贮藏12 h和4℃贮藏第6天,三种淡水鱼的TVB-N值均超过15 mg N/100 g,均检测到腐胺和尸胺成分,说明淡水鱼开始腐败变质,电子鼻响应信号也均能很好地区分三种淡水鱼新鲜程度变化。综上,贮藏温度和时间是影响淡水鱼新鲜度的重要因素,特征生物胺及电子鼻感应器响应值可以用来判断淡水鱼品质新鲜度变化,评价方法具有可行性。本研究为淡水鱼产品的新鲜度评价提供理论依据。

关键词：淡水鱼电子鼻生物胺贮藏

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：