检索结果-南通市图书馆

Journal of Integrative Plant Biology 2023年第5期65卷 1328-1343页

作者： Buwei cao Linhao Ge Mingzhen Zhang Fangfang Li Xueping Zhou State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China State Key Laboratory of Rice Biology Institute of BiotechnologyZhejiang UniversityHangzhou 310058China

Autophagy is a conserved intracellular degradation process that plays an active role in plant response to virus infections.Here we report that geminiviruses counteract activated autophagymediated antiviral defense in plant cells through the c2 proteins they encode.We found that,in Nicotiana benthamiana plants,tomato leaf curl Yunnan virus(TLcYnV)infection upregulated the transcription levels of autophagy-related genes(ATGs).Overexpression of NbATG5,NbATG7,or NbATG8a in N.benthamiana plants decreased TLcYnV accumulation and attenuated viral symptoms.Interestingly,transgenic overexpression of NbATG7 promoted the growth of N.benthamiana plants and enhanced plant resistance to TLcYnV.We further revealed that the c2 protein encoded by TLcYnV directly interacted with the ubiquitinactivating domain of ATG7.This interaction competitively disrupted the ATG7–ATG8 binding in N.benthamiana and Solanum lycopersicum plants,thereby inhibiting autophagy activity.Furthermore,we uncovered that the c2-mediated autophagy inhibition mechanism was conserved in three other geminiviruses.In summary,we discovered a novel counter-defensive strategy employed by geminiviruses that enlists their c2 proteins as disrupters of ATG7–ATG8 interactions to defeat antiviral autophagy.

关键词： autophagy c2 counterdefense geminivirus plant defense the ATG7–ATG8 interaction

conversion of natural gas to c_2 hydrocarbons through dielectric-barrier discharge plasma catalysis

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2002年第3期45卷 299-310页

作者：王保伟许根慧 State Key Laboratory of c1 chemical Technology Tianjin University Tianjin China

The experiments are carried out in the system of continuous flow reactors with dielectric-barrier discharge (DBD) for studies on the conversion of natural gas to c2 hydrocarbons through plasma catalysis under the atmosphere pressure and room temperature. The influence of discharge frequency, structure of electrode, discharge voltage, number of electrode, ratio of H2/cH4, flow rate and catalyst on conversion of methane and selectivity of c2 hydrocarbons are investigated. At the same time, the reaction process is investigated. Higher conversion of methane and selectivity of c2 hydrocarbons are achieved and deposited carbons are eliminated by proper choice of parameters. The appropriate operation parameters in dielectric-barrier discharge plasma field are that the supply voltage is 20-40 kV (8.4-40 W), the frequency of power supply is 20 kHz, the structure of (b) electrode is suitable, and the flow of methane is 20-60 ml · min-1. The conversion of methane can reach 45%, the selectivity of c2 hydrocarbons

关键词： natural gas dielectric-barrier discharge plasma c2 hydrocarbon.

在线全文

学校读者我要写书评

暂无评论

Tetrahedron

chinese Journal of chemistry 2019年第8期37卷 834-842页

作者： Lin Wu Yusheng chen Jingfang Pei Min Tang Shangshang Wang Zhichang Liu Department of chemistry Zhejiang UniversityHangzhouZhejiang 310027China School of Science Westlake University18 Shilongshan RoadHangzhouZhejiang 310024China

connecting a triangle base and an apex forms a simplest polyhedron-that is,a tetrahedron.On account of their structural simplicity and stability,two common classes of tetrahedra-namely,M4L4 and M4L6 (M indicates anions or metal cations,L indicates ligands with c3 symmetry for M4L4 and c2 symmetry for M4L6,respectively)-can be readily constructed from (i) six straight edges through an edge-bridged strategy or (ii) four triangle faces through a face-capped strategy,by means of supramolecular or coordination assembly.The intrinsic cavities inside tetrahedra enable them to act as versatile hosts for encapsulating a variety of guests,which leads to a wide range of applications including molecular recognition,catalysis,sensing and so on.In this review,we intend to summarize specifically the work carried out in the realm of porous tetrahedral cages.It includes representative synthetic strategies for the preparation of tetrahedra along with a general summary on their structural features.Thereafter,we will highlight the state-of-the-art progress in various functions of tetrahedra,in addition to presenting a full overview of applications wherein we aim to provide new insights into the design and preparation of new topological geometric structures and functional materials on the basis of the simplest polyhedron-tetrahedron.

关键词： c3 M4L4 c2

面向信息时代网络赋能指挥控制的层次模式连通结构

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

指挥与控制学报 2023年第5期9卷 589-595页

作者：黄谦李坎李美兰张小伟军事科学院北京100091 陆军步兵学院石家庄校区河北石家庄050227

信息时代网络赋能指挥控制(network enabled command and control,NEc2)的理念,是通过使联网作战兵力信息共享效益最大化,达到作战效能的最大化.通过分析NEc2信息布局应具有的属性要求,提出一种可实现的层次模式联合兵力指挥控制(comman... 详细信息

信息时代网络赋能指挥控制(network enabled command and control,NEc2)的理念,是通过使联网作战兵力信息共享效益最大化,达到作战效能的最大化.通过分析NEc2信息布局应具有的属性要求,提出一种可实现的层次模式联合兵力指挥控制(command and control,c2)连通结构,对其自适应c2特性进行分析,最后结合层次模式指挥控制连通结构信息交换示例,对信息标准交换和按需交换进行介绍,并论述了该连通结构的特性、优点和技术要求.

关键词：指挥控制信息时代网络赋能层次模式连通结构自适应 c2 特性标准交换按需交换

Isometric Immersions of Mn1 （c1）*Mn2（c2） Into Space Forms Mn（c） by Soliton Method

在线全文

学校读者我要写书评

暂无评论

数学进展 1999年第2期28卷 187-188页

作者：陈建华北京大学北京 100871

D.FerusandFPedit[1]gaveafamilyofisometricimmersionsfromconstantcurvaturemanifoldsintoconstantcurvaturemanifoldsvia1-parameterloopalgebraandalsogaveamethodtogettheseisometricimmersionsbyafinitedimensionalODEinLaxform.B... 详细信息

关键词： SO n1 n2 by Soliton Method c2 c1 Into Space Forms M~n Isometric Immersions of M

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Ti_3Alc_2的高温临氢行为

材料研究学报 2014年第11期28卷 858-864页

作者：陈辰张海斌彭述明龙兴贵朱建国中国工程物理研究院核物理与化学研究所绵阳621900 四川大学材料科学与工程学院成都610065

研究了Ti3Al c2体材料在氢气氛中的高温(1100~1400℃)热稳定性。采用XRD、SEM、SIMS和Raman分析等手段对Ti3Al c2临氢反应前后的物相组成、表面形貌进行了表征;使用热力学软件Factsage计算了反应过程中的气态产物。结果表明,在1100~140... 详细信息

研究了Ti3Al c2体材料在氢气氛中的高温(1100~1400℃)热稳定性。采用XRD、SEM、SIMS和Raman分析等手段对Ti3Al c2临氢反应前后的物相组成、表面形貌进行了表征;使用热力学软件Factsage计算了反应过程中的气态产物。结果表明,在1100~1400℃氢气氛条件下有少量H溶解在Ti3Al c2材料中,Ti3Al c2发生了以Al元素缺失为特征的有限程度的分解反应。缺失的Al元素与气氛中极微量的氧反应形成了均匀但不致密的Al2O3膜;而当反应温度为1400℃时,Al2O3膜发生了明显的脱落。使用热力学软件的计算结果预测,部分缺失Al元素与H2反应生成气体产物Al H。初步的研究结果表明,在1300℃以下Ti3Al c2具有较好的耐氢性能。

关键词：无机非金属材料临氢高温 Ti3Al c2

STUDY ON ELEcTRONIc STRUcTURE AND BONDING OF cLUSTER cOMPOUND Sc_7cl_(10)c_2

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Structural chemistry 1993年第1期12卷 15-17页

作者：李振祥林永华等 LaboratoryofRareEarthchemistryandPhysics Changchun LaboratoryofRareEarthchemistr

The electronic structure and bonding of the cluster compound Sc7cl10c2 have been studied by INDO method. In contract to the weak interaction between metal-metal in the compound Gd10cl18c4, the bonding between metal atoms (Sc-Sc) in Sc7cl10c2 is rather strong. The contribution of the orbitals 4s and 4p is larger than that of 3d to the Sc-Sc bond. In the cluster compound, besides Sc-Sc bonding, there are Sc -c and Sc -cl bonds. The contribution of 3d is larger than that of 4s and 4p to the bond Sc-c. The contribution of 3d is slightly less than that of 4p and 4s to the bond Sc-cl. Among the three kinds of bonds, the Sc-cl bond is the weakest, the bond order of the Sc-Sc is close to that of the Sc-c.

关键词： STUDY ON ELEcTRONIc STRUcTURE AND BONDING OF cLUSTER cOMPOUND Sc7cl cI c2 than

高速火焰喷涂Fe-Al/cr_3c_2复合涂层的组织与性能

在线全文

学校读者我要写书评

暂无评论

金属热处理 2006年第7期31卷 46-49页

作者：徐润生徐滨士马世宁董世运朱子新刘晓明装甲兵工程学院装备再制造技术国防科技重点实验室北京100072 内蒙古电力科学研究院内蒙古呼和浩特010020

用高速火焰喷涂法在20钢上制备Fe-A l/cr3c2复合涂层。利用配有能谱仪的扫描电镜分析涂层表面形貌和所含元素,利用X射线衍射仪分析涂层的相组成,并测试了涂层的结合强度、显微硬度、孔隙率等性能。结果表明,高速火焰喷涂Fe-A l/cr3c2复... 详细信息

用高速火焰喷涂法在20钢上制备Fe-A l/cr3c2复合涂层。利用配有能谱仪的扫描电镜分析涂层表面形貌和所含元素,利用X射线衍射仪分析涂层的相组成,并测试了涂层的结合强度、显微硬度、孔隙率等性能。结果表明,高速火焰喷涂Fe-A l/cr3c2复合涂层中主要包括Fe、A l以及FeA l、Fe3A l、cr3c2相,cr3c2增强相呈点状均匀分布涂层中;涂层具有较高的结合强度、硬度和较低的孔隙率。

关键词：高速火焰喷涂 Fe-Al/cr3 c2 组织与性能

Treatment of c2 body fracture with unusual distractive and rotational components resulting in gross instability

在线全文

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2013年第4期4卷 323-326页

作者： Darryl Lau Samuel S Shin Rakesh Patel Paul Park Department of Neurosurgery University of Michigan Department of Neurological Surgery University of Pittsburgh Department of Orthopedic Surgery University of Michigan

cervical fractures can result in severe neurological compromise and even death. One of the most commonly injured segments is the c2 vertebrae, which most frequently involves the odontoid process. In this report, we present the unusual case of a 28-year-old female who sustained a c2 vertebral body fracture(comminuted transverse fracture through the body and both transverse processes) that had both a significant distractive and rotational component, causing the fracture to be highly unstable. Application of halo bracing was unsuccessful. The patient subsequently required a c1-c4 posterior spinal fusion. Follow-up computer tomography imaging confirmed fusion and the patient did well clinically thereafter.

关键词： c2 Distractive Odontoid fracture Rotational Spine TypeⅢ Unstable

激光烧蚀Al热原子与cF_4反应中c_2的形成及其发光光谱研究

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

物理学报 2003年第5期52卷 1297-1301页

作者：张树东李海洋中国科学院安徽光学精密机械研究所环境光谱学实验室

脉冲激光烧蚀金属平面铝靶产生的热原子与气相cF4碰撞反应中 ,在 40 0— 60 0nm之间观测到激发态c2 分子的发光光谱 ,它们可归属为Swan带的d3Πg-a3Πu 跃迁中Δv=2 ,1,0 ,- 1,- 2五个振动序列 (v’≤ 6) .光谱强度分析表明 ,c2 激发态... 详细信息

脉冲激光烧蚀金属平面铝靶产生的热原子与气相cF4碰撞反应中 ,在 40 0— 60 0nm之间观测到激发态c2 分子的发光光谱 ,它们可归属为Swan带的d3Πg-a3Πu 跃迁中Δv=2 ,1,0 ,- 1,- 2五个振动序列 (v’≤ 6) .光谱强度分析表明 ,c2 激发态的振动温度达 63 40K左右 .与激光烧蚀Al+O2 反应生成AlO的实验结果以及激光烧蚀cu +cF4的光谱比较 ,对比Al( 2 P1 2 - 2 S1 2 ,3 94 4nm)和c2 的d—a跃迁 ( 0— 0 )带带头 ( 5 16 5nm)的飞行时间轮廓 ,认为激发态的Al( 2 S1 2 )原子通过电子态传能可能是c2

关键词：激光烧蚀 c2 cF4 Al 热原子铝靶四氟化碳碰撞反应发光光谱激发态能级跃迁等离子体谱线碳分子