检索结果-南通市图书馆

Contemporary climate infuence on variability patterns of Anadenanthera colubrina ***,a key species in seasonally dry tropical forests

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 Forestry Research 2022年第1期33卷 89-101页

作者： María Victoria García María Eugenia barrandeguy Kathleen prinz Genética de Poblaciones y Cuantitativa-Departamento de Genética-Facultad de Ciencias Exactas Químicas y Naturales-Universidad Nacional deMisionesInstituto de Biología Subtropical(UNaM-CONICET)Nodo PosadasFélix de Azara 15523300 PosadasArgentina Consejo Nacional de Investigaciones Científicas Y Técnicas(CONICET) PosadasMisionesArgentina Institute of Systematic botany With Herbarium Haussknecht and botanical Gardens Friedrich-Schiller-University Jena07743 JenaGermany

The distribution of many plant species has been shaped by climate changes,and their current phenotypic and genetic variability refect microclimatically suitable *** study relates contemporary climate to variability patterns of phenotypic traits and molecular markers in the Argentinean distribution of Anadenanthera colubrina ***,as well as to identify the most relevant phenotypic trait or molecular marker associated with those *** from four populations in both biogeographic provinces,Paranaense and Yungas,were *** analyses and multiple linear regressions were carried out to determine relationships among phenotypic traits and nuclear microsatellites,respectively,to climatic variables,and to identify the phenotypic traits as well as nuclear microsatellite loci most sensitive to *** and three clusters of individuals were detected based on genetic and phenotypic data,*** clusters based on genetic data refected the biogeographic origin of *** traits were the most relevant indicators of climatic *** microsatellite locus Ac41.1 appeared to be non-neutral presenting a strong correlation with climate variable temperature *** findings show complex patterns of genetic and phenotypic variability in the Argentinean distribution of *** *** related to the present or contemporary climate,and provides an example for an integrative approach to better understand climate impact on contemporary genetic and phenotypic variability in light of global climate change.

关键词： Contemporary climate Curupay Genetic variability Phenotypic variability Seasonally dry tropical forests

Conjugated linoleic acid isomers and their precursor fatty acids regulate peroxisome proliferator-activated receptor subtypes and major peroxisome proliferator responsive element-bearing target genes in HepG2 cell model

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science b(biomedicine & biotechnology) 2013年第2期14卷 115-123页

作者： Sailas bENJAMIN Silke FLOTHO Torsten bRCHERS friedrich SPENER Department of biochemistry University of Münster48149 MünsterGermany Enzyme Technology Laboratory Biotechnology DivisionDepartment of BotanyUniversity of CalicutKerala 673 635India Department of Molecular biosciences Lipidomics Research CenterUniversity of GrazHeinrichstrasse 318010 GrazAustria

The purpose of this study was to examine the induction profiles （as judged by quantitative reverse tran- scription polymerase chain reaction （qRT-PCR）） of peroxisome proliferator-activated receptor （PPAR） α,β, y subtypes and major PPAR-target genes bearing a functional peroxisome proliferator responsive element （PPRE） in HepG2 cell model upon feeding with cis-9,trans-11-octadecadienoic acid （9-CLA） or trans-10,cis-12-octadecadienoic acid （10-CLA） or their precursor fatty acids （FAs）. HepG2 cells were treated with 100 pmol/L 9-CLA or 10-CLA or their precursor FAs, viz., oleic, linoleic, and trans-11-vaccenic acids against bezafibrate control to evaluate the induc- tion/expression profiles of PPAR （α, β, γ subtypes and major PPAR-target genes bearing a functional PPRE, i.e., fatty acid transporter （FAT）, glucose transporter-2 （GLUT-2）, liver-type FA binding protein （L-FAbP）, acyl CoA oxidase-1 （ACOX-1）, and peroxisomal bifunctional enzyme （PbE） with reference to β-actin as house keeping gene. Of the three housekeeping genes （glyceraldehyde 3-phosphate dehydrogenase （GAPDH）, β-actin, and ubiquitin）, β-actin was found to be stable. Dimethyl sulfoxide （DMSO）, the common solubilizer of agonists, showed a significantly higher induction of genes analyzed, qRT-PCR profiles of CLAs and their precursor FAs clearly showed upregulation of FAT, GLUT-2, and L-FAbP （-0.5-.0-fold）. Compared to 10-CLA, 9-CLA decreased the induction of the FA metabolizing gene ACOX-1 less than did PbE, while 10-CLA decreased the induction of PbE less than did ACOX-I. both CLAs and precursor FAs upregulated PPRE-beadng genes, but with comparatively less or marginal activation of PPAR subtypes This indicates that the binding of CLAs and their precursor FAs to PPAR subtypes results in PPAR activation, thereby induction of the target transporter genes coupled with downstream lipid metabolising genes such as ACOX-1 and PbE. To sum up, the expression profiles of these candidate genes showed that CLAs and th

关键词： Conjugated linoleic acid HepG2 cell model qRT-PCR Peroxisome proliferator-activated receptor Peroxisome proliferator responsive element-bearing genes Lipid agonists

Collision risk-capacity tradeoff analysis of an en-route corridor model

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2014年第1期27卷 125-135页

作者： Ye bojia Hu Minghua John friedrich Shortle College of Civil Aviation Nanjing University of Aeronautics and Astronautics National Key Laboratory of Air Traffic Flow Management Nanjing University of Aeronautics and Astronautics Center for Air Transportation Systems Research George Mason University

Flow corridors are a new class of trajectory-based airspace which derives from the next generation air transportation system concept of operations. Reducing the airspace complexity and increasing the capacity are the main purposes of the en-route corridor. This paper analyzes the collision risk-capacity tradeoff using a combined discrete-continuous simulation method. A basic two-dimensional en-route flow corridor with performance rules is designed as the operational envi- ronment. A second-order system is established by combining the point mass model and the propor- tional derivative controller together to simulate the self-separation operations of the aircrafts in the corridor and the operation performance parameters from the User Manual for the base of Aircraft Data are used in this research in order to improve the reliability. Simulation results indicate that the aircrafts can self-separate from each other efficiently by adjusting their velocities, and rationally set- ting the values of some variables can improve the rate and stability of the corridor with low risks of loss of separation.

关键词： Air traffic control Corridor Risk-capacity tradeoff Self-separation Simulation

Deep convolutional neural networks to restore single-shot electron microscopy images

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2024年第1期10卷 3149-3167页

作者： I.Lobato T.friedrich S.Van Aert Department of Physics EMATUniversity of AntwerpGroenenborgerlaan 171B-2020 AntwerpBelgium NANOlab Center of Excellence Department of PhysicsUniversity of AntwerpGroenenborgerlaan 171B-2020 AntwerpBelgium

Advanced electron microscopy techniques,including scanning electron microscopes(SEM),scanning transmission electron microscopes(STEM),and transmission electron microscopes(TEM),have revolutionized imaging ***,achieving high-quality experimental images remains a challenge due to various distortions stemming from the instrumentation and external *** distortions,introduced at different stages of imaging,hinder the extraction of reliable quantitative *** this paper,we will discuss the main sources of distortion in TEM and S(T)EM images,develop models to describe them,and propose a method to correct these distortions using a convolutional neural *** validate the effectiveness of our method on a range of simulated and experimental images,demonstrating its ability to significantly enhance the signal-to-noise *** improvement leads to a more reliable extraction of quantitative structural information from the *** summary,our findings offer a robust framework to enhance the quality of electron microscopy images,which in turn supports progress in structural analysis and quantification in materials science and biology.

关键词： neural Deep networks

Effects of substrate surface treatments on hybrid manufacturing of AlSi7Mg using die casting and selective laser melting

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 Materials Science & Technology 2023年第25期156卷 142-156页

作者： Haiyang Fan Ann Witvrouw friedrich Wolf-Monheim Rainer Souschek Shoufeng Yang Department of Mechanical Engineering and Flanders Make KU LeuvenCelestijnenlaan 300Bbox 2420HeverleeB-3001 LeuvenBelgium Ford Research & Advanced Engineering Ford Research and Innovation Center AachenSüsterfeldstraße 20052072 AachenGermany Yantai Research Institute Harbin Engineering University264000 YantaiChina

To balance the manufacturing cost and customizability of automotive parts,a hybrid manufacturing process combining die-casting and selective laser melting(SLM)is proposed:starting with a conventional cast substrate,SLM is utilized to add additional geometric elements on top of *** this hybrid process,the first priority is to prepare a substrate surface suitable for the subsequent SLM addition of the top-on *** this study,the original cast surface of AlSi7Mg was processed by sandblasting,wire electro-discharge machining,and laser remelting,***,additional AlSi7Mg components were built on both the original cast and treated surfaces through *** hybrid builds,these surfaces and resultant interfaces were examined by optical and scanning electron *** indicate that the defect-free metallurgical joint between the cast and additively added parts can be formed on all surfaces except for the one processed by electro-discharge *** observed epitaxial grain growth crossing the interface implies a strong connection between the cast and the SLMed *** these benefits,also mismatches in microstructure,residual stress level and element distribution between the two parts are *** a comprehensive assessment,laser remelting with no additional machining is recommended as the optimal surface treatment preceding SLM fabrication,because of its user-friendly operation,low cost,and high industrial feasibility.

关键词： Hybrid manufacturing Aluminium alloy Surface treatment Laser remelting Interface Automotive

H pylori and gastric cancer: Shifting the global burden

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第34期12卷 5458-5464页

作者： Christian prinz Susanne Schwendy Petra Voland II. MedicalDepartment Technical University of Munich D-81675 MunichGermany

Infection with H pylori leads to a persistent chronic inflammation of the gastric mucosa, thereby increasing the risk of distal gastric adenocarcinoma. Numerous studies have determined a clear correlation between Hpylori infection and the risk of gastric cancer; however, general eradication is not recommended as cancer prophylaxis and time points for treatment remain controversial in different areas of the world. Prevalence rates in Western countries are decreasing, especially in younger people （〈 10%）; and a decline in distal gastric adenocarcinoma has been observed. Risk groups in Western countries still show considerably higher risk of developing cancer, especially in patients infected with cagA^＋ strains and in persons harboring genetic polymorphism of the IL-1b promoter （-511T/T） and the corresponding IL-1 receptor antagonist （IL-1RN^＊2）. Thus, general eradication of all infected persons in Western countries not recommended and is limited to risk groups in order to achieve a risk reduction. In contrast, infection rates and cancer prevalence are still high in East Asian countries. A prevention strategy to treat infected persons may avoid the development of gastric cancer to a large extent and with enormous clinical importance. However, studies in China and Japan indicate that prevention of gastric cancer is effective only in those patients that do not display severe histological changes such as atrophy and intestinal metaplasia. Thus, prophylactic strategies to prevent gastric cancer in high risk populations such as China should therefore especially aim at individuals now at younger age when the histological alterations caused by the bacterial infection was still reversible. In countries with a low prevalence of gastric cancer, risk groups carrying cagA^＋ strains and IL-1 genetic polymorphisms should be identified and treated.

关键词： H pylori Gastric cancer

In situ spontaneous emission control of MoSe2-WSe2 interlayer excitons with high quantum yield

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2025年第1期13卷 210-224页

作者： bO HAN CHIRAG C.PALEKAR FREDERIK LOHOF SVEN STEPHAN VICTOR N.MITRYAKHIN JENS-CHRISTIAN DRAWER ALEXANDER STEINHOFF LUKAS LACKNER MARTIN SILIES báRbARA ROSA MARTIN ESMANN FALK EILENbERGER CHRISTOPHER GIES STEPHAN REITZENSTEIN CHRISTIAN SCHNEIDER Institut für Physik Fakult?t VCarl von Ossietzky Universit?t Oldenburg Institut für Festk?rperphysik Technische Universit?t Berlin Institute for Theoretical Physics and bremen Center for Computational Material Science Universit?t Bremen Institute for Lasers and Optics Hochschule Emden/Leer Fraunhofer-Institute for Applied Optics and Precision Engineering IOF Institute of Applied Physics Abbe Center of PhotonicsFriedrich Schiller Universit?t Jena Max Planck School of Photonics

Optical resonators are a powerful platform to control the spontaneous emission dynamics of excitons in solidstate nanostructures. We study a MoSe2-WSe2heterostructure that is integrated in a cryogenic open optical microcavity to gain insights into fundamental optical properties of the emergent interlayer excitons. First, we utilize a low-quality-factor planar open cavity and investigate the modification of the excitonic lifetime as on-and offresonance conditions are met with consecutive longitudinal modes.

关键词： Cavity quantum electrodynamics Nanostructures Optical properties Optical resonators Quantum fluctuations Zeeman effect

纳米碳化硅填充环氧树脂复合材料的摩擦磨损特性

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

复合材料学报 2004年第6期21卷 14-20页

作者：纪秋龙章明秋容敏智 WETZEL b friedrich K 中山大学材料科学研究所聚合物复合材料及功能材料教育部重点实验室 Institute for Composite Materials University of Kaiserslautern D-67663 Kaiserslautern Germany

　以提高环氧树脂的摩擦磨损性能为目的,研究了纳米碳化硅粒子填充环氧树脂复合材料的滑动干摩擦磨损特性,着重探讨纳米粒子表面接枝改性、纳米粒子含量、摩擦条件等对复合材料摩擦学性能的影响。通过对复合材料磨损表面的形貌分析,以... 详细信息

　以提高环氧树脂的摩擦磨损性能为目的,研究了纳米碳化硅粒子填充环氧树脂复合材料的滑动干摩擦磨损特性,着重探讨纳米粒子表面接枝改性、纳米粒子含量、摩擦条件等对复合材料摩擦学性能的影响。通过对复合材料磨损表面的形貌分析,以及复合材料的热变形性能和表面硬度的测定,探讨了复合材料的磨损机理。结果表明,纳米碳化硅粒子能在很低的含量下提高环氧树脂耐磨性、并降低其摩擦系数,而经过接枝处理后的纳米碳化硅粒子填充复合材料的上述性能改善更为明显,耐磨性比环氧树脂提高近4倍,摩擦系数降低36%。这说明在SiC纳米粒子表面引入聚丙烯酰胺接枝链后,由于界面的强相互作用(包括化学键合与链纠缠),有效地提高了复合材料的抵抗裂纹引发能力等性能,从而有利于改善其摩擦学性能。

关键词：纳米碳化硅接枝改性环氧树脂复合材料摩擦磨损

Platform for laser-driven X-ray diagnostics of heavy-ion heated extreme states of matter

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2025年第1期10卷 57-71页

作者： P.Hesselbach J.Lütgert V.bagnoud R.belikov O.Humphries b.Lindqvist G.Schaumann A.Sokolov A.Tauschwitz D.Varentsov K.Weyrich b.Winkler X.Yu b.Zielbauer D.Kraus D.Riley Zs.Major P.Neumayer Institut für Angewandte Physik Goethe-Universität Frankfurt am MainMax-von-Laue Str.160438 FrankfurtGermany GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstr.164291 DarmstadtGermany Institut für Physik Universität RostockAlbert-Einstein-Str.2318059 RostockGermany Institut für Angewandte Physik Technische Universität DarmstadtSchlossgartenstr.764289 DarmstadtGermany Helmholtz Institut Jena Fröbelstieg 307743 JenaGermany Institut für Geowissenschaften Goethe-Universität Frankfurt am MainAltenhöferallee 160438 Frankfurt am MainGermany Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstr.40001328 DresdenGermany European XFEL GmbH Holzkoppel 422869 SchenefeldGermany Institut für Kernphysik Technische Universität DarmstadtSchlossgartenstr.964289 DarmstadtGermany Centre for Light-Matter Interaction School of Mathematics and PhysicsQueen’s University BelfastUniversity RoadBelfast BT71NNUnited Kingdom

We report on commissioning experiments at the high-energy,high-temperature(HHT)target area at the GSI Helmholtzzentrum für Schwerionenforschung GmbH,Darmstadt,Germany,combining for the first time intense pulses of heavy ions from the SIS18 synchrotron with high-energy laser pulses from the PHELIX laser *** demonstrate the use of X-ray diagnostic techniques based on intense laserdriven X-ray sources,which will allow probing of large samples volumetrically heated by the intense heavy-ion beams.A new target chamber as well as optical diagnostics for ion-beam characterization and fast pyrometric temperature measurements complement the experimental *** platform is designed for experiments at the future Facility for Antiproton and Ion Research in Europe GmbH(FAIR),where unprecedented ion-beam intensities will enable the generation of millimeter-sized samples under high-energy-density conditions.

关键词： heated intense extreme