检索结果-南通市图书馆

Roles of Arabidopsis Patatin-Related Phospholipases A in Root Development Are Related to Auxin Responses and Phosphate Deficiency

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2010年第3期3卷 524-538页

作者： Steffen Rietz Georgi Dermendjiev Esther Oppermann Fikadu Getah Tafesse Yunus Effendi Andre Holk Jane E. Parker Markus Teige gunther F.E. Scherer Max Planck Institute for Plant Breeding Research Department of Plant Microbe Interactions Carl von Linne Weg 10 D-50829 Cologne Germany Leibniz University Hannover Molecular Developmental Physiology Herrenhauser Str. 2 D-30419 Hannover Germany University of Vienna MFPL Department of Biochemistry Dr. Bohrgasse 9 A-1030 Wien Austria Present address: University of Utrecht Department of Membrane Enzymology Inst. Biomembranes Padualaan 8 NL 3584 CH Utrecht. The Netherlands

Phospholipase A enzymes cleave phospho- and galactolipids to generate free fatty acids and lysolipids that function in animal and plant hormone signaling. Here, we describe three Arabidopsis patatin-related phospholipase A （pPLA） genes AtPLAIVA, AtPLAIVB, and AtPLAIVC and their corresponding proteins. Loss-of-function mutants reveal roles for these pPLAs in roots during normal development and under phosphate deprivation. AtPLAIVA is expressed strongly and exclusively in roots and AtplalVA-null mutants have reduced lateral root development, characteristic of an impaired auxin response. By contrast, AtPLAIVB is expressed weakly in roots, cotyledons, and leaves but is transcriptionally induced by auxin, although AtplalVB mutants develop normally. AtPLAIVC is expressed in the floral gynaecium and is induced by abscisic acid （ABA） or phosphate deficiency in roots. While an AtplalVC-1 loss-of-function mutant displays ABA respon- siveness, it exhibits an impaired response to phosphate deficiency during root development. Recombinant AtPLA proteins hydrolyze preferentially galactolipids and, less efficiently, phospholipids, although these enzymes are not localized in chloroplasts. We find that AtPLAIVA and AtPLAIVB are phosphorylated by calcium-dependent protein kinases in vitro and this enhances their activities on phosphatidylcholine but not on phosphatidylglycerol. Taken together, the data reveal novel functions of pPLAs in root development with individual roles at the interface between phosphate deficiency and auxin signaling.

关键词： Abiotic/environmental stress hormonal regulation protein phosphorylation/dephosphorylation signaltransduction gene regulation Arabidopsis.

Experimental Modelling of the Impact of a DC Magnetic Field on the Melt Flow in a Continuous Casting Mould

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

Journal of Iron and Steel Research International 2012年第S2期19卷 862-865页

作者： TIMMEL Klaus WONDRAK Thomas RDER Michael STEFANI Frank ECKERT Sven GERBETH gunther Helmholtz-Zentrum Dresden-Rossendorf

This paper describes experimental investigations of flow structures and related transport processes in the continuous casting mould under the influence of an external DC magnetic field at laboratory *** results will be presented here which have been obtained using a physical model(mini-LIMMCAST)operating with the low melting point alloy *** to the concept of the electromagnetic brake the impact of a DC magnetic field on the outlet flow from the Submerged Entry Nozzle(SEN)has been studied up to Hartmann numbers of about *** Ultrasound-Doppler-Velocimetry(UDV)was applied for measurements of the flow pattern in the *** conductivity anemometers were used to measure the turbulent quantities of the *** effect of the magnetic field on the flow structure turned out to be manifold and rather *** magnetic field causes a deflection of the jet,at which the respective exit angle from the nozzle ports becomes more ***,both the penetration depth of the discharging flow into the lower part of the mould and the impinging velocity of the jet onto the side wall are reduced.A significant return flow occurs in the adjacent regions of the *** vortices are formed with axes being aligned with the magnetic field *** vortical structures are typical for quasi-two-dimensional magneto-hydrodynamic(MHD)*** flow measurements do not manifest a general braking effect which would be expected as an overall damping of the flow velocity and the related fluctuations all-over the mould *** of the wall conductivity showed a striking impact on the resulting flow structures.

关键词： continuous casting liquid metal model electromagnetic brake ultrasonic flow measurement potential probes

Graph-based visual analytics for cyber threat intelligence

在线全文

学校读者我要写书评

暂无评论

Cybersecurity 2018年第1期1卷 279-297页

作者： Fabian Bohm Florian Menges gunther Pernul Department of Information Systems University of RegensburgUniversitatsstraBe 3193053 RegensburgGermany

The ever-increasing amount of major security incidents has led to an emerging interest in cooperative approaches to encounter cyber *** enable cooperation in detecting and preventing attacks it is an inevitable necessity to have structured and standardized formats to describe an *** formats are complex and of an extensive nature as they are often designed for automated processing and *** characteristics hamper the readability and,therefore,prevent humans from understanding the documented *** is a major problem since the success and effectiveness of any security measure rely heavily on the contribution of security *** meet these shortcomings we propose a visual analytics concept enabling security experts to analyze and enrich semi-structured cyber threat intelligence *** approach combines an innovative way of persisting this data with an interactive visualization component to analyze and edit the threat *** demonstrate the feasibility of our concept using the Structured Threat Information eXpression,the state-ofthe-art format for reporting cyber security issues.

关键词： Cyber threat intelligence Visual analytics Usable cybersecurity STIX

Measuring caregiving belief,caregiver competence,and caregiving interaction.

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

Measuring caregiving belief,caregiver competence,and caregiv...

The Chemistry and Biological Activities of Natural Products from Northern African Plant Families:From Taccaceae to Zygophyllaceae

2008国际作业治疗研讨会

作者： CHIU,Teresa EYSENBACH,gunther Research and Development COTA HealthCanada Centre for Global eHealth Innovation

＜正＞Background: This paper reports on the development of a family-centred caregiving *** caregiver measures have been translated into ***,research has shown that these measures may not reflect the needs unique to Ch...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Natural Products and Bioprospecting 2016年第2期6卷 63-96页

作者： Fidele Ntie-Kang Leonel E.Njume Yvette I.Malange Stefan gunther Wolfgang Sippl Joseph N.Yong Department of Pharmaceutical Chemistry Martin-Luther University of Halle-WittenbergWolfgang-Langenbeck-Str.406120 Halle(Saale)Germany Department of Chemistry Faculty of ScienceUniversity of BueaP.O.Box 63BueaCameroon Department of Chemistry Faculty of ScienceChemical and Bioactivity Information CentreUniversity of BueaP.O.Box 63BueaCameroon Institute of Pharmaceutical Sciences Research Group Pharmaceutical BioinformaticsAlbert-Ludwigs-Universitat FreiburgHermann-Herder-Strasse 979104 FreiburgGermany

Traditional medicinal practices have a profound influence on the daily lives of people living in developing countries,particularly in Africa,since the populations cannot generally afford the cost of Western *** have undertaken to investigate the correlation between the uses of plants in Traditional African medicine and the biological activities of the derived natural products,with the aim to validate the use of traditional medicine in Northern African *** literature is covered for the period 1959-2015 and part III of this review series focuses on plant families with names beginning with letters T to *** authors have focused on curating data from journals in natural products and *** each journal home page,a query search based on country name was *** articles‘‘hits’’were then verified,one at a time,that the species was harvested within the Northern African geographical *** current data partly constitutes the bases for the development of the Northern African natural compounds *** review discusses 284 plant-based natural compounds from 34 species and 11 *** was observed that the ethnobotanical uses of less than 40%of the plant species surveyed correlated with the bioactivities of compounds identified.

关键词： Africanflora Biologicalactivities Ethnobotany Naturalproducts Traditionalmedicine

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

用水平铸造法生产挤压锭的紧凑型熔铸系统

轻合金加工技术 1991年第10期19卷 23-25,22页

作者： gunther Hertwich 孟凡杰

Gartner有限公司是联邦德国最大的建筑型材挤压厂之一,拥有两台20兆牛挤压机。该公司的业务遍及世界各地,包括社团总部大厦、工业企业及高层建筑等,承接外墙装修、铝卷帘幕墙、铝门窗制造与室内装修等。1983年,奥地利Hertwich工程公司... 详细信息

Gartner有限公司是联邦德国最大的建筑型材挤压厂之一,拥有两台20兆牛挤压机。该公司的业务遍及世界各地,包括社团总部大厦、工业企业及高层建筑等,承接外墙装修、铝卷帘幕墙、铝门窗制造与室内装修等。1983年,奥地利Hertwich工程公司提出建议,在Gartner公司所在地——联邦德国Gundelfingen市利用该公司的原有条件,兴建自己的连续熔铸系统,尽管当时尚无运行中的类似系统可证实这种系统能够满足该公司对挤压锭的高质量要求,但这一建议还是立即引起了Gartner公司的兴趣。

关键词：水平铸造挤压锭紧凑型熔铸系统

纳米Ag-Cu合金的Ag和Cu析出与晶粒长大行为研究

在线全文

学校读者我要写书评

暂无评论

科学通报 1997年第1期42卷 96-99页

作者：戚震中沈辉 B.gunther 柳襄怀上海交通大学信息存储研究中心 Fraunhofer Institute of Applied Materials.D-28717 Bremen Germany 中国科学院上海冶金研究所离子束开放实验室

纳米晶材料(nc-)首先由Gleiter和他的合作者提出,并用惰性气体淀积法(IGC)所获得.这些纳米颗粒在真空下原位加压成型.纳米晶材料的平均直径一般采用X-射线衍射法测定.引起X射线衍射峰展宽有两个因素:小的颗粒直径和晶体缺陷造成的内应力... 详细信息

纳米晶材料(nc-)首先由Gleiter和他的合作者提出,并用惰性气体淀积法(IGC)所获得.这些纳米颗粒在真空下原位加压成型.纳米晶材料的平均直径一般采用X-射线衍射法测定.引起X射线衍射峰展宽有两个因素:小的颗粒直径和晶体缺陷造成的内应力.在惰性气体淀积法(IGC)过程中,由于金属蒸气迅速冷却凝聚,可能形成过饱和固溶体而处于非平衡状态;另一方面金属合金蒸气中的溶质原子浓度的涨落会改变溶质在纳米颗粒中的浓度,这都可能使X射线衍射峰展宽.因此除用X射线衍射法外,结合其他方法是必要的.AgCu合金是研究这一效应的最佳材料.Kumpmann用示差热分析(DSC)来研究nc-AgCu合金,观察到大的放热反应,这与过饱和α-Ag和α-Cu的析出有关.

关键词：纳米晶析出银铜合金晶粒长大效应

产寿险行业客户忠诚度与数据化转型:2014年全球版

在线全文

学校读者我要写书评

暂无评论

新金融 2014年第11期 18-22页

作者：杨竣皓项安达 gunther Schwarz 贝恩公司

贝恩公司与数字数据收集公司Research Now携手合作,于2013-2014年冬季对欧洲、美洲和亚太地区的消费者固定样组展开调查,期间总共访问了18个国家的147,989位客户,此外,贝恩还与SSI公司合作调查了亚洲的10,433位投保人。本次调查旨在评... 详细信息

贝恩公司与数字数据收集公司Research Now携手合作,于2013-2014年冬季对欧洲、美洲和亚太地区的消费者固定样组展开调查,期间总共访问了18个国家的147,989位客户,此外,贝恩还与SSI公司合作调查了亚洲的10,433位投保人。本次调查旨在评测客户对其主要寿险和财险供应商的忠诚度以及探索顾客为何秉持其观点的深层原因。调查揭示了不同的客户细分市场如何看待其财险和寿险公司、客户的消费决策过程及其对保险公司的期望,并分析了不同分销模式和互动渠道将如何影响忠诚度。本刊经贝恩公司许可,选取该报告的重点部分发表,供读者参考。

关键词：保险业客户忠诚度服务模式数据化

VOITH液力耦合器在石油和天然气工业中的应用

在线全文

学校读者我要写书评

暂无评论

油气储运 1997年第6期16卷 56-58页

作者：焦玉瑞 gunther H.Peikert 大连石化公司

液力耦合器不仅在控制各种旋转设备的转速方面非常简单和方便,而且其控制可靠,有良好的可维修性。介绍了几种VOITH调速型液力耦合器及其应用实例。调速型和带齿轮的调速型液力耦合器用于发电厂锅炉给水泵和大型风机的控制已有40多年的... 详细信息

液力耦合器不仅在控制各种旋转设备的转速方面非常简单和方便,而且其控制可靠,有良好的可维修性。介绍了几种VOITH调速型液力耦合器及其应用实例。调速型和带齿轮的调速型液力耦合器用于发电厂锅炉给水泵和大型风机的控制已有40多年的历史。60年代初在中东和80年代初在北海油田,液力耦合器开始在石油及天然气工业中应用,典型的应用是安装在原油和液化气工程的管道泵和装载泵以及注水泵和压缩机上,这足以证明液力耦合器在工业中的重要地位。

关键词：液力耦合器类型石油天然气 VOITH