检索结果-南通市图书馆

Salicylic Acid Regulates Pollen Tip Growth ：hrough an NPR3/NPR4-1ndependent Pathway

Molecular Plant 2016年第11期9卷 1478-1491页

作者： Duoyan Rong Nan Luo jean claude Mollet Xuanming Liu Zhenbiao Yang State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation College of Biology Hunan University Changsha 410082 China Department of Botany and Plant Sciences and Center for Plant Cell Biology Institute of Integrated Genome Biology University of California Riverside CA 92521 USA Normandie Univ UniRouen Laboratoire Glycobiologie et Matrice Extracellulaire V6getale Institute for Research and Innovation in Biomedicine Vegetal Agronomie Sol et Innovation 76821 Mont-Saint-Aignan France

Tip growth is a common strategy for the rapid elongation of cells to forage the environment and/or to target to long-distance destinations. In the model tip growth system of Arabidopsis pollen tubes, several small- molecule hormones regulate their elongation, but how these rapidly diffusing molecules control extremely localized growth remains mysterious. Here we show that the interconvertible salicylic acid （SA） and meth- ylated SA （MESA）, well characterized for their roles in plant defense, oppositely regulate Arabidopsis pollen tip growth with SA being inhibitory and MeSA stimulatory. The effect of SA and MeSA was independent of known NPR3/NPR4 SA receptor-mediated signaling pathways. SA inhibited clathrin-mediated endocytosis in pollen tubes associated with an increased accumulation of less stretchable demethylated pectin in the apical wall, whereas MeSA did the opposite. Furthermore, SA and MeSA alter the apical activation of ROP1 GTPase, a key regulator of tip growth in pollen tubes, in an opposite manner. Interestingly, both MeSA methylesterase and SA methyltransferase, which catalyze the interconversion between SA and MESA, are localized at the apical region of pollen tubes, indicating of the tip-localized production of SA and MeSA and consistent with their effects on the apical cellular activities. These findings suggest that local generation of a highly diffusible signal can regulate polarized cell growth, providing a novel mechanism of cell polarity control apart from the one involving protein and mRNA polarization.

关键词： SA (salicylic acid) MeSA (methyl salicylic acid) endocytosis FM4-64 CRIB4-GFP ROP activity

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

Ultrafast synthesis and sintering of materials in a single running experiment approach by using electric fields

引用

journal of Advanced Ceramics 2019年第2期8卷 265-277页

作者： Lílian M.jESUS Ronaldo S.SILVA jean-claude M’PEKO Sao Carlos Institute of Physics University of Sao Paulo(USP)P.O.Box:369CEP:13560-970 Sao CarlosSPBrazil Group of Advanced Ceramic Materials Department of PhysicsFederal University of Sergipe(UFS)CEP:49100-000 Sao CristovaoSEBrazil Department of Physics Federal University of Sao Carlos(UFSCar)13560-905 Sao CarlosSPBrazil

Processing of materials in the form of ceramics normally involves several steps including calcination at a relatively low temperature for synthesis of the end-product powder and sintering at a high temperature for *** work we have been developing introduces a novel approach enabling synthesis plus sintering of materials in a single running experiment by using electric fields,ending with dense ceramics that display grains noticeably finer than in conventional *** new paradigm is fully illustrated with experiments conducted on amorphous CaCu3Ti4O12 precursor powder,shown to experience,on heating,crystallization through intermediate phases,followed by chemical reaction leading to synthesis of the end-product powder,plus densification depending on field *** processing time and furnace temperature are considerably reduced,demonstrating that enhanced synthesis and sintering rates applied under field *** results found in Bi2/3Cu3Ti4O12are also *** different factors that may contribute to this unique scenario,including joule heating,defect generation,and reduction of free energy for nuclei formation promoted by the applied field,are briefly ***,the findings we bring here are exclusive as they show an exploitable way that allows rapid processing of materials with good control over particle and grain coarsening.

关键词： field-assisted processing synthesis sintering microstructure dielectric response

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

The local contribution to the microwave background radiation

引用

Research in Astronomy and Astrophysics 2015年第4期15卷 461-474页

作者： jean-claude Pecker jayant V.Narlikar Francois Ochsenbein Chandra Wickramasinghe College de France Inter-University Centre for Astronomy and Astrophysics Centre de Donnees astronomiques de Strasbourg (CDS) Observatoire de Strasbourg11rue de l’Universite 67000 StrasbourgFrance Buckingham Centre for Astrobiology University of Buckingham

The observed microwave background radiation （MBR） is commonly in- terpreted as the relic of an early hot universe, and its observed features （spectrum and anisotropy） are explained in terms of properties of the early universe. Here we describe a complementary, even possibly alternative, interpretation of MBR, first proposed in the early 20th century, and adapt it to modern observations. For example, the stellar Hipparcos data show that the energy density of starlight from the Milky Way, if suit- ably thermalized, yields a temperature of ~2.81 K. This and other arguments given here strongly suggest that the origin of MBR may lie, at least in a very large part, in re-radiation of thermalized galactic starlight. The strengths and weaknesses of this alternative radical explanation are discussed.

关键词： Galaxy: stellar content -- (cosmology:) cosmic microwave background-- cosmology: observations

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

Seasonal changes in the parasite prevalence of a small Malagasy lemur species (Lepilemur edwardsi)

引用

Integrative Zoology 2023年第3期18卷 427-439页

作者： janina BETHGE jean claude RAZAFIMAMPIANDRA Arne WULFF Kathrin H.DAUSMANN Institute of Zoology Functional EcologyUniversität HamburgHamburgGermany Mention Zoologie et BiodiversitéAnimale Facultédes SciencesUniversitéd’AntananarivoAntananarivoMadagascar

Parasitic infections can impact theﬁtness of individuals and can have inﬂuence on animals’population *** individuals’parasite prevalence often changes depending on external or seasonal changes,for example,rainfall and ambient temperatures,but also on internal changes,for example,changes in body *** this study we aimed to identify the environmental factors that may inﬂuence the intestinal parasite and ectoparasite prevalence of the folivorous Malagasy primate species,Lepilemur edwardsi,living in a seasonal dry deciduous *** living in this habitat have to adapt to seasonal changes of ambient temperature,with almost no precipitation during the dry season and hence strongﬂuctuations of resource availability throughout the *** sampled the feces and ectoparasites of *** throughout the *** parasite prevalence increased from the wet to the dry season and was highest in the late dry season,which might be due to the accompanying decrease in diet ***,ectoparasite prevalence decreased in the dry season,presumably due to the prevailing unfavorable environmental conditions for the development of ectoparasites(i.e.,mites and ticks).Paired with the higher resting metabolism and stress level of *** during the late dry season,it seems that this species may struggle when dry seasons intensify in its habitat.

关键词： ectoparasites intestinal parasites Madagascar primates seasonality

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

Cross-border Insolvency of Financial Institutions(Case of Banks in Rwanda)

Cross-border Insolvency of Financial Institutions(Case of Ba...

引用

作者： RUDACOGORA jean claude 华东政法大学

学位级别：硕士

面临财务困难的银行可能在不同的国家有运营、子公司和分支机构。由于经济衰退,银行可能面临财务压力,可能导致部分业务暂停,从而导致资不抵债和破产。重要的是要考虑外国银行的资不抵债是否会对其位于不同州、地区或司法管辖区的分支... 详细信息

面临财务困难的银行可能在不同的国家有运营、子公司和分支机构。由于经济衰退,银行可能面临财务压力,可能导致部分业务暂停,从而导致资不抵债和破产。重要的是要考虑外国银行的资不抵债是否会对其位于不同州、地区或司法管辖区的分支机构或子公司产生影响。目前,在国际一级,没有适用的文书或条例规定了银行跨国界破产问题的解决办法。《贸易法委员会跨境破产示范法》和《欧洲破产条例》都没有关于解决信贷机构跨境破产问题的任何条款。虽然欧盟已经通过了一些专门的规则来规范信贷机构,如《信贷机构重组与清盘指令》,但这并不能简单地适用于世界其他地区,因为它只适用于欧盟成员国。就卢旺达而言,目前没有关于金融机构破产的具体法律,因此可以认为,与信贷机构特别是银行跨国界破产有关的所有事项都由《2021年破产法》管理,而不考虑管理这些机构的特别规则。显然,贸易法委员会跨国界破产示范法启发了卢旺达跨国界破产领域的破产法。但是,卢旺达的破产法没有具体处理与银行有关的破产问题,也没有具体说明《贸易法委员会跨国界破产示范法》第2条规定的保留意见。卢旺达银行法律规定,外国银行或外国公司的子公司在卢旺达共和国必须保持账户分开父母的银行或母公司,但这项法律也对此事保持沉默对外国银行或其分支机构的破产。鉴于卢旺达银行业的发展,至关重要的是要建立一个具体制度来管制银行的跨国界破产。这项研究突出表明,需要建立具体的法律制度来解决卢旺达银行的跨国界破产问题。

关键词：银行跨境破产

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

High-resolution and instantaneous imaging of latent fingerprints

引用

Chinese Chemical Letters 2023年第4期34卷 1-2页

作者： Ming Cheng juli jiang jean-claude Chambron Leyong Wang Key Laboratory of Mesoscopic Chemistry of MOE Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Institut de Chimie de Strasbourg UMR 7177CNRSUniversitéde StrasbourgStrasbourg Cedex 67008France

Fingerprints can serve as an information storage platform for individuals and play an important role in forensic investigation and security[1].Most of them are invisible to the naked eye and are called latent fingerprints(LFPs).Conventional imaging techniques suffer from limitations like low resolution and sensitivity[2],restricting the recognition of LFPs to macroscopic features,such as shape,core,ending,bifurcation,island,pores,and so on,which correspond to levels 1 and *** of level 3 including ridges and their edges,are challenging to recognize.

关键词： latent resolution restrict

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

Local Plants Potentially Suitable for Phytoremediation of Soils Polluted by Heavy Metals: The Case of Landfill Sites

引用

journal of Geoscience and Environment Protection 2024年第7期12卷 72-88页

作者： Kpan Kpan Kouakou Gains Touré Mamadou Ouattara Nouffou Doudjo Kouassi Kouadio claude Ehouman N’guetta Moïse Ouattara Djibril Tiho Seydou UFR Sciences de la Nature Universit Nangui Abrogoua Abidjan Cte dIvoire UFR Agroforesterie Universit Jean Lorougnon Gud Daloa Cte dIvoire

Landfills are contaminated sites that need to be cleaned up to prevent human and environmental exposure to pollutants. This article aims to identify local plants capable of restoring soil polluted by heavy metals. To this end, plant species at the Bonoua landfill were inventoried. X-ray fluorescence spectrometry was used to determine the heavy metal content of soil and plants from the landfill. The bioconcentration factor (BCF) of metals in plants was evaluated. The Bonoua landfill is covered with 62 plant species, comprising 28 botanical families and 50 genera. The BCF varied from 0.08 (titanium) to 2.27 (strontium) for Phyllanthus amarus;from 0.06 (titanium) to 1.83 (copper) for Alternanthera sessilis and from 0.03 (arsenic) to 2.10 (strontium) for Amaranthus spinosus. Phyllanthus amarus, Alternanthera sessilis, and Amaranthus spinosus are strontium-accumulating species (BCF > 1). Similarly, copper BCF values were above 1 for Phyllanthus amarus, and Alternanthera sessilis. These two plant species are therefore copper accumulators. In short, Phyllanthus amarus, Alternanthera sessilis, and Amaranthus spinosus are candidate species for phytoremediation of heavy metal-polluted soils, given their BCF > 1.

关键词： Heavy Metals Phytoremediation Phyllanthus amarus Alternanthera sessilis Amaranthus spinosus

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

An Empirical Analysis Study on the Efficacy of a Routing Algorithm for Saving Energy in Wireless Sensor Networks

An Empirical Analysis Study on the Efficacy of a Routing Alg...

引用

作者： jean claude Loua 湖南大学

学位级别：硕士

无线传感器网络(WSNs)是由大量节点部署组成的一项智能技术。对传感器网络日益增长的研究,给我们带来了众多的和多元化的应用。在其早期,传感器节点被用于军事目的,观察敌人的地理坐标、军事设备,从而定位到战场中。它也用于环境中：森... 详细信息

无线传感器网络(WSNs)是由大量节点部署组成的一项智能技术。对传感器网络日益增长的研究,给我们带来了众多的和多元化的应用。在其早期,传感器节点被用于军事目的,观察敌人的地理坐标、军事设备,从而定位到战场中。它也用于环境中：森林火灾、自然灾害;灾难、地震、火山、洪水等等。出于环境目的使用传感器节点的必要性是为了人类的生存。现在也在人类日常生活中使用,例如智能学习、交通道路控制、水质监测、管道监测等。此外,在健康(在医院监测家中的病人、显微外科手术)、农业、物业监控(建筑、汽车等)和仅列举几个例子的工业方面有良好的声誉。这些不同的应用意味着无线传感器网络是人类生活状况现代化的一个组成部分。节点的运转主要依赖储存在物理电池里的能源资源。节点的能量资源是有限的,其必须基于一个有效的路由算法以最优的方式使用。在研究工作中,我们假定一个事实,一旦传感器节点让其组件以一个低效的路由协议去实现任何基本通信,这将对数据信息的传输过程产生不利影响。它将使节点迅速耗尽能量且过早死亡因此,某些节点由于缺乏能量动力会停止通信活动。这类情况可能会导致具有两种显著不同的域：第一种,还有一些节点具有一些残留的能量,这些被算作活节点;第二种情况是死亡节点的域,这些节点没有任何可以完成通信活动的残余能量。换句话说,它们的能量水平低于阂值。特别是对于用于军事目的和民事用途的无线传感器网络的应用,第二种情况看起来很糟糕。除了能源问题,还有其他问题,这些被归类到无线传感器网络问题的第二类,也就是安全问题--数据传输安全、少量内存存储备份检索到的数据、安装在节点上的操作系统的更新问题、节点开始任何活动前保持静态和节点位置从一个地方到另一个地方的改变都仍然重要的拓扑问题、编程问题等。在所有提及的问题中,能源仍然是无线传感器网络中毋庸置疑地最有挑战性的概念,相对于以上提及的其他问题,也一直是最吸引众多研究者的领域。究其原因,自从无线传感器网络的研究开始以来,在能源演化方面没有记录足够的进步且它的图示至今仍然停滞。在这项研究中,我们遇到能源问题,并提出了一个路由算法,称为簇间平方单元多跳路由算法,旨在减轻阻塞,以便应用中任何节点之间的通信成本函数最小化。在节点设计时能量利用问题的研究依然是非常重要的,因为在大多数情况下,更换电池是不可能的。因此,这就使得能量问题变得棘手。这意味着,传感器节点的寿命在很大程度上依赖于电池的能量。在无线传感器网络中,传输过程是非常耗能的,这就是为什么现在研究的重点是在缓解能源消耗的基础上通过不同的路由算法来降低能源消耗,这些算法能够很好的降低能量消耗。为了解决这个问题,一般概念的节点通常设在有危险的环境中,在其中真实存在的人类不能如前所述的去探寻。对于这个特殊的方面,节点的设计必须遵循一个自我组织的概念。结点组件的概述表明,它配备了一个传感器、微型计算机、收发器和电源,其组件的每个实体都扮演着不同的角色,使该节点可以正常运行而没有任何副作用。在节点开始网络通信活动之前,它必须知道其邻居节点和它本身之间每一个单一连接路由的成本函数的值。使用节点能量的成本函数来选择最佳目的节点的问题是我们提出的解决方案的基石,基于最低成本函数,源节点选择这个合适的目的节点。近年来,无线传感器网络的研究工作给予成本函数更多关注,这与节点的能量消耗密切相关。为了避免传感器节点消耗大量的电力资源,研究人员提出许多路由算法来减少能源损耗。在我们的研究工作中,正如我们前面所提到的,我们旨在使用成本函数去找到一条便捷的路径,以致传感器节点能够将得到的数据传播到相应的目的节点。考虑普通节点到最后的目的节点的中间成本函数的综合,计算出成本函数值。为了实现这一有效成本函数的目标,建立一个有效的高效路由算法是可取的,从通信过程中选择最佳成本函数。这意味着,不选择代价高的路径,因此节点可以节省很多电力资源。至于成本函数方面,已有大量之前提出的方案来缓解传感器节点设计时的能量利用方法。我们的研究工作或多或少的参考其中的一些方案。我们把一些路由算法的不足之处当作灵感元素,而且也是我们研究工作的重点。我们首先观察了低功耗自适应集簇分层型协议(LEACH)。LEACH协议是第一个提出来采用随机分布式均匀成簇机制的分簇路由协议,该协议适合传感器节点同质且静态分布的环境。在LEACH中,传感器节点基于一些参数比如接受信号强度最大的簇头选择他们的主簇。在一定间隔后,一些节点被选为簇头。LEACH协议通过簇头轮转的方式来维持节点的能量平衡,在网络中均匀地分散能量负荷,且当不需要时关闭普通节点。传感器信息系统低功耗PEGASIS借鉴了LEACH中分簇算法的思想。PEGASIS形成了传感器节点链。传感器节点从邻居节点那传输或接收数据,这样PEGASIS避免簇的形成且在链中只

关键词：普通节点主节点集群平方单元传感器网络能耗成本函数

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

How to Create Real Labor: the Study on Work-Based Learning Model in Zhejiang Technological and Vocational Colleges-Taking Zhejiang Industry Polytechnic College as An Example

How to Create Real Labor: the Study on Work-Based Learning M...

引用

作者： Bigirimana jean claude 浙江师范大学

学位级别：硕士

The main objective of this research was to study the work-based learning model in Zhejiang Technological and Vocational Colleges and Zhejiang Industry Polytechnic College located in Shaoxing city was taken as a sample of vocational colleges in Zhejiang *** researcher wanted to explore the significant of the Work-based learning model as well as the strengths and challenges in implementing of this system especially by focusing on apprenticeship through practice in classroom *** study employed a qualitative research method and data were collected in Zhejiang Industry Polytechnic College in November ***（8）teachers and ten（10）students from different majors at that vocational college were participated in this *** was also employed interview with teachers,students in order to identify the strengths and challenges of the work-based learning practices in Zhejiang Province and how learners use materials available without forgetting to study the challenges encountered by teachers and students during practice in classroom *** study was analysed the link between theories in classroom and practice in classroom training through the teaching model available in work-based learning as well as the quality of the teaching assured in order to give some suggestions to policy makers and relevant stakeholders in Zhejiang Technological and Vocational *** data analysis,according to the participants’responses and the researcher’s observations the findings show strengths and challenges in work-based learning implementation in Zhejiang Industry Polytechnic College:firstly,the college has almost enough materials to train students in classroom training even if in some classroom the material is not totally due to the high number of students in some *** the classroom practices,the largest training centres named SHAOXING PUBLIC TRAINING CENTER（referred to as“the base”（基地））in Shaoxing city is located at Zhejiang Industry Polytechnic Coll

关键词： Higher Vocational Education classroom teaching Work-basedLearning

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-xPrxNiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells

引用

journal of Energy Chemistry 2020年第7期29卷 62-70,I0003页

作者： Vaibhav Vibhu Aurélien Flura Aline Rougier Clément Nicollet Sébastien Fourcade Teresa Hungria jean-claude Grenier jean-Marc Bassat CNRS Univ.BordeauxBordeaux INPICMCBUMR 5026F-33600 PessacFrance Centre de Microcaractérisation Raimond CASTAING Universitéde ToulouseCNRSUT3–Paul SabatierINPINSAEspace Clément Ader3 rue Caroline AigleToulouse 31400France

The chemical and electrochemical stability of lanthanide nickelates La2 NiO4+δ(LNO),Pr2 NiO4+δ(PNO)and their mixed compounds La(2-x)PrxNiO4+δ(LPNOs)with x=0.5,1 or 1.5 is *** aim is to promote these materials as efficient electrodes for solid oxide fuel cell(SOFC)and/or solid oxide electrolysis cell(SOEC).La2 NiO4+δand La1.5Pr0.5NiO4+δcompounds are chemically very stable as powders over one month in the temperature range 600-800℃,while the other materials rich in praseodymium progressively decompose into various perovskite-deriving components with additional Pr6 *** their uneven properties,all these materials are quite efficient and sustainable as electrodes on top of gadolinium doped ceria(GDCBL)//yttrium doped zirconia(8 YSZ)electrolyte,for one month at 700℃without *** polarization(300 mA·cm-2),the electrochemical performances of LNO,PNO and La1.5Pr0.5NiO4+δ(LP5 NO)quickly degrade in SOFC mode,*** the oxygen reduction reaction,while they show durability in SOEC mode,*** the oxide oxidation reaction.

关键词： Lanthanide nickelates SOFC cathode SOEC anode Stability Inductive loop Degradation

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：