检索结果-南通市图书馆

Dual role of FGF in proliferation and endoreplication of Drosophila tracheal adult progenitor 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

Journal of Molecular Cell Biology 2020年第1期12卷 32-41页

作者： Cristina de Miguel Josefa Cruz David Martin xavier Franch-Marro Institute of Evolutionary Biology(Consejo Superior de Investigaciones Cientificas-Universitat Pompeu Fabra) Passeig Maritim de la Barceloneta 3708003 BarcelonaSpain

Adult progenitor cells activation is a key event in the formation of adult *** Drosophilat formation of abdominal adult trachea depends on the specific activation of tracheal adult progenitors(tracheoblasts)at the Tr4 and Tr5 spiracular *** of these tracheoblasts generates a pool of tracheal cells that migrate toward the posterior part of the trachea by the activation of the branchless/fibroblast growth factor(Bnl/FGF)signaling to form the abdominal adult ***,we show that,in addition to migration,Bnl/FGF signaling,mediated by the transcription factor Pointed,is also required for tracheoblast *** tracheoblast activation relies on the expression of the FGF ligand bnl in their nearby ***,we show that,in the absence of the transcription factor Cut(Ct),Bnl/FGF signaling induces endoreplication of tracheoblasts partially by promoting fizzy-related ***,our results suggest a dual role of Bnl/FGF signaling in tracheoblasts,inducing both proliferation and endoreplication,depending on the presence or absence of the transcription factor Ct,respectively.

关键词： FGF trachea adult progenitors cut proliferation endoreplication Pnt Fzr

Absorbing Boundary Conditions for Solving N-Dimensional Stationary Schr¨odinger Equations with Unbounded Potentials and Nonlinearities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2011年第10期10卷 1280-1304页

作者： Pauline Klein xavier Antoine Christophe Besse Matthias Ehrhardt Institut Elie CartanNancy Nancy-UniversiteCNRSUMR 7502INRIA CORIDA TeamBoulevard des Aiguillettes B.P.23954506 Vandoeuvre-les-NancyFrance Laboratoire Paul Painleve CNRS UMR 8524Simpaf Project Team-Inria CR Lille Nord EuropeUniversite des Sciences et Technologies de LilleCite Scientifique59655 Villeneuve d’Ascq CedexFrance Lehrstuhl fur Angewandte Mathematik und Numerische Analysis Fachbereich C-Mathematik und NaturwissenschaftenBergische Universitat WuppertalGaußstr.2042119 WuppertalGermany

We propose a hierarchy of novel absorbing boundary conditions for the onedimensional stationary Schr¨odinger equation with general(linear and nonlinear)*** accuracy of the new absorbing boundary conditions is investigated numerically for the computation of energies and ground-states for linear and nonlinear Schr¨odinger *** turns out that these absorbing boundary conditions and their variants lead to a higher accuracy than the usual Dirichlet boundary ***,we give the extension of these ABCs to N-dimensional stationary Schr¨odinger equations.

关键词： Absorbing boundary conditions stationary Schrodinger equations unbounded domain spatially dependent potential ground states computation

Hilbert-Huang transform with adaptive waveform matching extension and its application in power quality disturbance detection for microgrid

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 Modern Power Systems and Clean Energy 2016年第1期4卷 19-27页

作者： Peng LI Jing GAO Duo XU Chang WANG xavier YANG State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBaoding 071003China R&D of Electricite de France(EDF) China CenterBeijingChina

With the significant improvement of microgrid technology, microgrid has gained large-scale ***, the existence of intermittent distributed generations, nonlinear loads and various electrical and electronic devices causes power quality problem in microgrid, especially in islanding mode. An accurate and fast disturbance detection method which is the premise of power quality control is necessary. Aiming at the end effect and the mode mixing of original Hilbert-Huang transform(HHT), an improved HHT with adaptive waveform matching extension is proposed in this paper. The innovative waveform matching extension method considers not only the depth of waveform, but also the rise time and fall time. Both simulations and field experiments have verified the correctness and validity of the improved HHT for power quality disturbance detection in microgrid.

关键词： Adaptive waveform matching extension End effect Improved Hilbert-Huang transform Microgrid Power quality

Metals and metalloid bioconcentrations in the tissues of Typha latifolia grown in the four interconnected ponds of a domestic landfill site

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第4期29卷 56-68页

作者： Zohra Ben Salem xavier Laffray Ahmed Al-Ashoor Habib Ayadi Lotfi Aleya Bourgogne Franche-Comte University Chrono-Environnement Laboratory UMR CNRS 6249 F-25030 Besancon Cedex France Paris Est-Creteil University IPE team iEES Paris UMR 7618 F-94010 Creteil Cedex Prance Thi Qar University IQ-64001 AI Nasiriyah Iraq Sfax University LR/UR/05ES05 Biodiversity and Aquatic Ecosystem BP 1171 CP 3000 Sfax Tunisia

The uptake of metals in roots and their transfer to rhizomes and above-ground plant parts（stems, leaves） of cattails（Typha latifolia L.） were studied in leachates from a domestic landfill site（Etueffont, France） and treated in a natural lagooning system. Plant parts and corresponding water and sediment samples were taken at the inflow and outflow points of the four ponds at the beginning and at the end of the growing season. Concentrations of As, Cd, Cr, Cu, Fe, Mn, Ni and Zn in the different compartments were estimated and their removal efficiency assessed, reaching more than 90% for Fe, Mn and Ni in spring and fall as well in the water compartment. The above-and below-ground cattail biomass varied from 0.21 to 0.85, and 0.34 to 1.24 kg dry weight/m^2, respectively, the highest values being recorded in the fourth pond in spring 2011. The root system was the first site of accumulation before the rhizome, stem and leaves. The highest metal concentration was observed in roots from cattails growing at the inflow of the system＇s first pond. The trend in the average trace element concentrations in the cattail plant organs can generally be expressed as： Fe 〉 Mn 〉 As 〉 Zn 〉 Cr 〉 Cu 〉 Ni 〉 Cd for both spring and fall. While T. latifolia removes trace elements efficiently from landfill leachates, attention should also be paid to the negative effects of these elements on plant growth.

关键词： Landfill leachate Lagooning Trace elements Typha latifolia Phytoremediation

Biomarkers are strongly needed in liver transplantation, time to move forward

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2024年第2期13卷 359-361页

作者： Lorenz Grossar Emma Butaye xavier Verhelst Hepatology Research Unit Department of Internal Medicine and PediatricsGhent UniversityGhentBelgium Liver Research Center Ghent Ghent UniversityGhent University HospitalGhentBelgium Department of Gastroenterology and Hepatology Ghent University HospitalGhentBelgium

The European Society for Organ Transplantation(ESOT)has created a consensus platform for evidence-based and best-practice *** the 2022 ESOT consensus conference,nine topics were chosen for further exploration based on their potential for impact on healthcare,existing research gaps,and incomplete coverage of the topic in current scientific literature(1).Among these topics,molecular biology testing for non-invasive diagnosis of allograft rejection was a focal point,as detailed in the ESOT consensus statement on biomarkers in liver transplantation(LT)(2).We extend our congratulations to the authors of the liver subgroup on their dedicated effort and rigorous approach in translating major unmet clinical needs into four well-defined questions of interest regarding biomarkers for prediction and/or diagnosis of longer-term complications after LT.

关键词： Liver transplantation(LT) biomarker personalised medicine

Gastrointestinal B-cell lymphomas:From understanding B-cell physiology to classification and molecular pathology

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 Gastrointestinal Oncology 2012年第12期4卷 238-249页

作者： xavier Sagaert Thomas Tousseyn Rhonda K Yantiss Department of Pathology University Hospitals Leuven Department of Pathology and Laboratory Medicine Weill Cornell Medical College

The gut is the most common extranodal site where lymphomas arise. Although all histological lymphoma types may develop in the gut, small and large B-cell lymphomas predominate. The sometimes unexpected finding of a lymphoid lesion in an endoscopic biopsy of the gut may challenge both the clinician (who is not always familiar with lymphoma pathogenesis) and the pathologist (who will often be hampered in his/her diagnostic skill by the limited amount of available tissue). Moreover, the past 2 decades have spawned an avalanche of new data that encompasses both the function of the reactive B-cell as well as the pathogenic pathways that lead to its neoplastic counterpart, the B-cell lymphoma. Therefore, this review aims to offer clinicians an overview of B-cell lymphomas in the gut, and their pertinent molecular features that have led to new insights regarding lymphomagenesis. It addresses the question as how to incorporate all presently available information on normal and neoplastic B-cell differentiation, and how this knowledge can be applied in daily clinical practice (e.g., diagnostic tools, prognostic biomarkers or therapeutic targets) to optimalise the managment of this heterogeneous group of neoplasms.

关键词： B-cell Non-Hodgkin’s lymphomas Gut Molecular pathology

Mesozoic Evaniidae (Insecta:Hymenoptera) in Spanish Amber:Reanalysis of the Phylogeny of the Evanioidea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2010年第4期84卷 809-827页

作者： Enrique PENALVER Jaime ORTEGA-BLANCO André NEL xavier DELCLOS Patrimonio Geologico Instituto Geologico y Minero de EspanaE-28003MadridSpain Departament d'Estratigrafia Paleontologia i Geociencies MarinesFacultat de GeologiaUniversitat de BarcelonaE-08071BarcelonaSpain UMR CNRS 7205 EntomologieMuseum National d'Histoire NaturelleF-75005ParisFrance

One new genus and five new species of the family Evaniidae are described from the Early Cretaceous （Albian） Spanish amber of Pefiacerrada-I （Province of Burgos）, San Just and Arroyo de la Pascueta （both in the Province of Teruel）： Cretevania alonsoi sp. nov., C. montoyai sp. nov., C. alcalai sp. nov., C. rubusensis sp. nov., and lberoevania roblesi gen. and sp. nov. Taxonomic changes include Cretevania pristina （Zhang and Zhang, 2000） comb. nov., C. exquisita （Zhang, Rasnitsyn, Wang and Zhang, 2007） comb. nov., C. vesca （Zhang, Rasnltsyn, Wang and Zhang, 2007） comb. nov., and C. cyrtocerca （Deans, 2004） comb. nov., as a result of the reinterpretation of the genera Procretevania and Eovernevania. The new well preserved specimens of the genus Cretevania, together with the characters shown by the type specimens of the synonymized genera, give new information about their anatomical characters of taxonomical importance, and the genus Cretevania Rasnitsyn, 1975 is re-diagnosed. The holotypes of the Russian species in amber have been revised. A cladistic analysis of fossil and extant groups of the superfamily Evanioidea is included. Cretevania had a wide palaeogeographic distribution, with the highest diversity known from Spain. The 13 known Cretevania species show a high interspecific variation mainly in wing characteristics, and a wide range of body and wing size.

关键词： Eovernevania Procretevania Cretevania lberoevania New taxa Early Cretaceous amber

Fast Texture Segmentation Based on Semi-Local Region Descriptor and Active Contour

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2009年第4期2卷 445-468页

作者： Nawal Houhou Jean-Philippe Thiran xavier Bresson Signal Processing Laboratory 5 Ecole Polytechnique Federale de Lausanne （EPFL） Lausanne Switzerland. Department of Mathematics University of California Los Angeles CA 90095-1555 USA.

In this paper, we present an efficient approach for unsupervised segmentation of natural and textural images based on the extraction of image features and a fast active contour segmentation model. We address the problem of textures where neither the gray-level information nor the boundary information is adequate for object extraction. This is often the case of natural images composed of both homogeneous and textured regions. Because these images cannot be in general directly processed by the gray-level information, we propose a new texture descriptor which intrinsically defines the geometry of textures using semi-local image information and tools from differential geometry. Then, we use the popular Kullback-Leibler distance to design an active contour model which distinguishes the background and textures of interest. The existence of a minimizing solution to the proposed segmentation model is proven. Finally, a texture segmentation algorithm based on the Split-Bregrnan method is introduced to extract meaningful objects in a fast way. Promising synthetic and real-world results for gray-scale and color images are presented.

关键词： Semi-local image information Beltrami framework metric tensor active contour Kullback-Leibler distance split-Bregman method.

Regulation of hepatic EAAT-2 glutamate transporter expression in human liver cholestasis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第6期20卷 1554-1564页

作者： Mustapha Najimi xavier Stéphenne Christine Sempoux Etienne Sokal Université Catholique de Louvain Institut de Recherche Expérimentale et Clinique (IREC) Laboratory of Pediatric Hepatology and Cell Therapy Anatomo-pathology Cliniques Universitaires St-Luc Université Catholique de Louvain

AIM: To investigate the activity and expression of EAAT2 glutamate transporter in both in vitro and in vivo models of cholestasis.

关键词： Glutamate transport Hepatocyte Bile duct ligation Cholestasis Biliary atresia