检索结果-南通市图书馆

Nicotiana attenuata's capacity to interact with arbuscular mycorrhiza alters its competitive ability and elicits major changes in the leaf transcriptome

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 Integrative Plant Biology 2018年第3期60卷 242-261页

作者： Ming Wang Julia Wilde Ian T.Baldwin karin Groten Department of Molecular Ecology Max Planck Institute for Chemical EcologyHans-Knoll-Str.8Jena 07745Germany

To study the local and systemic effects of arbuscular mycorrhizal fungal （AMF） colonization, Nicotiana attenuata plants impaired in their interactions with AMF due to silencing of a calcium- and calmodulin dependent protein kinase （inverted repreat （ir）CCaMK） were grown competitively in pairs with empty vector （EV） plants, with and without two different types of inoculum. When inoculated, EV plants strongly outperformed irCCaMK plants. Foliar transcript profiling revealed that AMF colonization significantly changed gene expression of P-starvation and -transporter genes in irCCaMK plants. The Phtl family phosphate transporter NaPT5 was not only specifically induced in roots after AMF colonization, but also in leaves of AMF-colonized irCCaMK plants, and in plants grown under low Pi conditions in the absence of AMF. The P-starvation signature of inoculated irCCaMK plants corresponded with increases in selected amino acids and phenolic compounds in leaves. We also found a strong AMF-induced increase in amino acids and phenolic metabolites in roots. Plants impaired in their interactions with AMF clearly have a fitness disadvantage when competing for limited soil nutrients with a fully functional isogenic line. The additional role of the AMF-induced Phtl family transporter NaPT5 in leaves under P-starvation conditions will require further experiments to fully resolve.

关键词： William J. Lucas University of California Davis USA

Regioselective Acylation of 2＇- or 3＇-Hydroxyl Group in Salicin： Hemisynthesis of Acylated Salicins

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

Chemical Research in Chinese Universities 2014年第5期30卷 774-777页

作者： SHAO Chen PEI Yuxin BORG-KARLSON Anna-karin PEI Zhichao College of Science Northwest A&F University Yangling 712100 P. R. China KTH Royal Institute of Technology Department of Chemistry Stockholm S-10044 Sweden

Salicin-based phenolic glycosides（PGs） are important defensive substances against herbivore feeding and have good bioactivities. In this work, a novel approach for the synthesis of salicin-based PGs has been developed, by which PGs of 2＇-O-acetylsaliein（5a）, 3＇-O-acetylsalicin（gb） and 3＇-O-benzoylsalicin（Sd） were hemisynthesized. The effects of acylation reagent, solvent and temperature on the regioselective acylation of 2＇- or 3＇-hydroxyl groups of salicin mediated by dibutyltin oxide were investigated. The optimal conditions under which the best regioselectivity reached for 5a-5d were discovered, respectively. Moreover, a tentative tin-oxygen coordination mechanism was put forward to explain the different regioselectivities shown under different conditions.

关键词： Regioselective acylation Salicin Phenolic glycoside Tin-oxygen coordination Hemisynthesis

Pefabloc- A sulfonyl fluoride serine protease inhibitor blocks induction of Diotericin in Drosoohila 1（2）mbn cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2012年第4期19卷 472-476页

作者： karin C. Johansson Kenneth Soderhall Maria I. Lind Department of Comparative Physiology Evolutionary Biology Centre Uppsala University Uppsala Sweden

Insects protect themselves against microbial infection by an efficient innate immune system that is activated by recognition ofinvariant microbial surface molecules. In the fruit fly Drosophila melanogaster the presence of bacteria is associated with expression of antimicrobial peptides in host immune-competent tissues. Host receptors detect infection and relay the signal to mount the appropriate immune response. In Drosophila hemocyte- like l（2）mbn cells pre-infection treatment with Pefabloc, a commonly used serine protease inhibitor, induced two major effects： it blocked expression of the antibacterial peptide Diptericin in response to live Gram-negative bacteria and bacterial surface molecules （crude lipopolysaccharide contaminated by peptidoglycans） and it induced morphological changes.

关键词： cell morphology diptericin Drosophila IMD pathway immune response,proteinase inhibitor

An introduction to molecular spintronics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2012年第6期55卷 867-882页

作者： JIANG ShangDa GOB karin CERVETTI Christian BOGANI Lapo Physikalisches Institut Universitiit Stuttgart Pfaffenwaldring 57 70550 Stuttgart Germany Max Planck lnstitut fiir Festkoerperforschung Heisenbergstrasse 1 70569 Stuttgart Germany

We review the progress and future possibilities in the emerging area of molecular spintronics. We first provide an overview of the different transport regimes in which electronic nanodevices can operate, then briefly overview the important characteristics of molecular magnetic materials that can be useful for application in spintronics and we eventually present several schemes to include such systems into spintronic nanodevices. We hightlight the importance of a chemical approach to the area, and in the last section we showcase some approaches to the creation of hybrids made of carbon nanostructures and molecular magnets, which are gaining increasing attention.

关键词： carbon nanostructures molecular spintronics molecular magnetism quantum transport electronicnanodevices

On Diffuse Interface Modeling and Simulation of Surfactants in Two-Phase Fluid Flow

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

Communications in Computational Physics 2013年第9期14卷 879-915页

作者： Stefan Engblom Minh Do-Quang Gustav Amberg Anna-karin Tornberg Division of Scientific Computing Department of Information TechnologyUppsala UniversitySE-75105 UppsalaSweden Linne Flow Centre Department of MechanicsSchool of Engineering ScienceRoyal Institute of TechnologyS-10044 StockholmSweden Linne Flow Centre Department of Numerical AnalysisSchool of Computer Science and CommunicationRoyal Institute of TechnologyS-10044 StockholmSweden

An existing phase-fieldmodel of two immiscible fluids with a single soluble surfactant present is discussed in *** analyze the well-posedness of the model and provide strong evidence that it is mathematically ill-posed for a large set of physically relevant *** a consequence,critical modifications to the model are suggested that substantially increase the domain of *** designed numerical simulations offer informative demonstrations as to the sharpness of our theoretical results and the qualities of the physical model.A fully coupled hydrodynamic test-case demonstrates the potential to capture also non-trivial effects on the overall flow.

关键词： Phase-field model Cahn-Hilliard equation surface active agent Ginzburg-Landau free energy well-posedness

Nanoscale chemical imaging of individual chemotherapeutic cytarabineloaded liposomal nanocarriers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2019年第1期12卷 197-203页

作者： karin Wieland Georg Ramer Victor U. Weiss Guenter Allmaier Bemhard Lendl Andrea Centrone Institute of Chemical Technologies and Analytics Research Division EnvironmentalProcess Analytics and SensorsTU WienVienna 1060Austria Center for Nanoscale Science and Technology National Institute of Standards and TechnologyGaithersburgMD 20899USA Institute for Research in Electronics and Applied Physics University of MarylandCollege ParkMD 20742USA Institute of Chemical Technologies and Analytics Research Division Instrumental and Imaging Analytical ChemistryTU WienVienna 1060Austria

Dosage of chemotherapeutic drugs is a tradeoff between efficacy and *** are nanocarriers that increase therapy efficacy and minimize side-effects by delivering otherwise difficult to administer therapeutics with improved efficiency and ***,variabilities in liposome preparation require assessing drug encapsulation efficiency at the single liposome level,an information that,for non-fluorescent therapeutic cargos,is inaccessible due to the minute drug load per *** induced resonance (PTIR) provides nanoscale compositional specificity,up to now,by leveraging an atomic force microscope (AFM) tip contacting the sample to transduce the sample's photothermal ***,on soft samples (e.g.,liposomes) PTIR effectiveness is reduced due to the likelihood of tip-induced sample damage and inefficient AFM ***,individual liposomes loaded with the chemotherapeutic drug cytarabine are deposited intact from suspension via nano-electrospray gas-phase electrophoretic mobility molecular analysis (nES-GEMMA) collection and characterized at the nanoscale with the chemically-sensitive PTIR method.A new tapping-mode PTIR imaging paradigm based on heterodyne detection is shown to be better adapted to measure soft samples,yielding cytarabine distribution in individual liposomes and enabling classification of empty and drug-loaded *** measurements highlight PTIR capability to detect ~ 103 cytarabine molecules (~ 1.7 zmol) label-free and non-destructively.

关键词： tapping photothermal induced resonance (PTIR) nanoscale chemical imaging liposomes cytarabine drug delivery nanocarriers

Assessment of the potential responses of ecosystem services to anthropogenic threats in the Eten wetland,Peru

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecosystem Health and Sustainability 2021年第1期7卷 215-231页

作者： Tania V.Rojas karin Bartl Jorge D.Abad Department of Engineering Pontificia Universidad Católica Del PerúLimaPeruFormerlyUniversidad De Ingenieria Y Tecnologia-UTECLimaPeru Department of Education Research&DevelopmentRed YakuLimaPeru Peruvian Life Cycle Assessment and Industrial Ecology Network-PELCAN Department of EngineeringPontificia Universidad Católica Del PerúLimaPeru

Introduction:Coastal wetlands are currently threatened by human drivers,such as agriculture,infrastructure development,and urban *** on these ecosystems disturb their morphology and biogeochemical cycles,resulting in the degradation of ecosystem ***,little has been done to understand the wetland response to identify proper conservation *** the Peruvian coast,wetlands present a diversity of landscapes that face similar threats and pressures;however,the ecosystem response in each one may be ***:This study aims to assess the environmental impacts on ecosystem services based on the understanding of geomorphic features and the status of the Eten coastal wetland(Peru).Methods:The methodology combines the application of open-source GIS tools and the collection of field data to characterize the geomorphic settings and to analyze the changes in environmental ***,the main threats and pressures on the Eten wetland are defined and related to impacts on ecosystem services using a cause-effect ***:Overall,the results indicated that the river plays a vital role in defining the wetland landscape and *** biological diversity of aquatic habitats is disturbed by hydraulic structures and agricultural *** land use affects supporting and regulation services,such as water regulation.

关键词： Ecosystem services wetland functions human-environment interactions Eten wetland coastal management

Comment on:Recurrence after spontaneous separation of epiretinal membrane in a young woman:a case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第4期17卷 783-784页

作者： Yusuke Kameda Yutaka Kaneko karin Ishinabe Nichika Fukuoka Yotsuya-sanchome Ekimae Eye Clinic Tokyo 160-0004Japan Department of Ophthalmology and Visual Sciences Yamagata University Faculty of MedicineYamagata 990-9585Japan

Dear Editor,Herein,we provide a commentary on the recently published article by Zeng QZ and Yu WZ[1].This case report provides interesting novel insights into the recurrence of epiretinal membrane(ERM)following self-separation in a young *** addition to the study,we have been investigating spontaneous ERM release for many years and have recently published a related paper[2].

关键词： separation young release

Formation of In-Situ Dispersion Strengthening Particles in Cast FeCrAl Alloy

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 2010年第2期17卷 74-78页

作者： FENG Shuo HAN Wei LUO He-li karin G LI Chang-hai High Temperature Material Research Institute Central Iron and Steel Research Institute Beijing 100081 China Group Office China Iron and Steel Research Group Beijing 100081 China Department of Materials Science and Engineering Chalmers University of Technology Gothenburg SE-412 96 Sweden

In order to fabricate dispersion strengthened alloys strengthened by submicron-sized or nano-sized stable particles through casting routes, understanding of the formation process of dispersion strengthening particles in metal melt is of significance. Thus, nano NiO and TiO2 particles were selected as reactant to form in-situ dispersion strengthening oxide particles in Fe20Cr5Al alloy. Nano NiO and TiO2 particle powder was separately dispersed into nano Ni powder first. The loose mixed nano powder was added in Fe20CrSAl alloy melt when pouring the melt into mold. The study shows that nano NiO particles were not as effective as nano TiO2 particles in forming dispersion strengthening Al2O3 particles. The final diameters of dispersion strengthening oxide particles arose from nano TiO2 particles were of submicron. The Brownian collision of particles had caused this coarsening.

关键词： in-situ particle dispersion strengthening particle formation east FeCrAl alloy