检索结果-南通市图书馆

BIOCEll 2013年第3期37卷 85-90页

作者： silvana l.d’amico Patricia I.lEONARdI Eduardo J.CÁCERES laboratorio de Ficología y Micología Departamento de BiologíaBioquímica y FarmaciaUniversidad Nacional del SurBahía BlancaArgentina CERZOS-CONICET Camino La Carrindanga Km 7Bahía BlancaArgentina

This is the first comprehensive ultrastructural study on dwarf males with external gametangia in the ge in the genus Oedogonium,from androspore germination to the liberation of mature male *** ultrastructure of the process in *** Wittrok is similar to that of Bulbochaete hiloensis(Nordstedt)Tiffany,butwith two remarkable *** ***:(1)instead of a true transverse wall,only condensed mucilage appears between the gametes of each antheridial cell,and (2)the cell wall between the basal cell and the basal most antheridial cell has simple plasmodesmata similar to those present in the transverse walls of vegetative cells,which are absent in ***.

关键词： androspores Chlorophyta dwarf males Oedogoniales Oedogonium macrandrium ultrastructure

Resource management at the network edge for federated learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

digital Communications and Networks 2024年第3期10卷 765-782页

作者： silvana Trindade luiz F.Bittencourt Nelson l.S.da Fonseca Institute of Computing State University of CampinasCampinasBrazil

Federated learning has been explored as a promising solution for training machine learning models at the network edge,without sharing private user *** limited resources at the edge,new solutions must be developed to leverage the software and hardware resources as the existing solutions did not focus on resource management for network edge,specially for federated *** this paper,we describe the recent work on resource manage-ment at the edge and explore the challenges and future directions to allow the execution of federated learning at the *** such as the discovery of resources,deployment,load balancing,migration,and energy effi-ciency are discussed in the paper.

关键词： Resource management Edge computing Federated learning Machine learning

Computational screening of materials with extreme gap deformation potentials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 1482-1491页

作者： Pedro Borl.do Jonathan Schmidt Hai-Chen Wang silvana Botti Miguel A.l.Marques Institut für Festkörpertheorie und-optik Friedrich-Schiller-Universität Jena and European Theoretical Spectroscopy FacilityMax-Wien-Platz 107743JenaGermany CFisUC Department of PhysicsUniversity of CoimbraRua Larga3004-516CoimbraPortugal Institut für Physik Martin-Luther-Universität Halle-WittenbergD-06099HalleGermany

In this work,we present a large-scale study of gap deformation potentials based on density-functional theory calculations for over 5000 *** expected,in most cases the band gap decreases for increasing volume with deformation potentials that can reach values of almost−15 *** find,however,also a sizeable number of materials with positive deformation *** members of this group are hal.de perovskites,known for their applications in *** then focus on understanding the physical reasons for so different values of the deformation potentials by investigating the correlations between this property and a large number of other material and compositional *** also train explainable machine learning models as well as graph convolutional networks to predict deformation potentials and establish simple rules to understand predicted ***,we analyze in more detail a series of materials that have record positive and negative deformation potentials.

关键词： deformation properties. extreme

Predicting stable crystalline compounds using chemical similarity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 99-107页

作者： Hai-Chen Wang silvana Botti Miguel A.l.Marques Institut für Physik Martin-Luther-Universität Halle-Wittenberg06120 Halle(Saale)Germany Institut für Festkörpertheorie und-Optik Friedrich-Schiller-Universität Jena and European Theoretical Spectroscopy FacilityMax-Wien-Platz 107743 JenaGermany

We propose an efficient high-throughput scheme for the discovery of stable crystalline *** approach is based on the transmutation of known compounds,through the substitution of atoms in the crystal structure with chemically similar *** concept of similarity is defined quantitatively using a measure of chemical replaceability,extracted by data-mining experimental *** this way we build 189,981 possible crystal phases,incl.ding 18,479 that are on the convex hull of *** resulting success rate of 9.72%is at least one order of magnitude better than the usual success rate of systematic high-throughput calculations for a specific family of materials,and comparable with speed-up factors of machine learning filtering *** a characterization of the set of 18,479 stable compounds,we calculate their electronic band gaps,magnetic moments,and *** approach,that can be used as a filter on top of any high-throughput scheme,enables us to efficiently extract stable compounds from tremendously large initial sets,without any initial assumption on their crystal structures or chemical compositions.

关键词： stability similarity crystalline

Recent advances and applications of machine learning in sol.dstate materials science

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 394-429页

作者： Jonathan Schmidt Mário R.G.Marques silvana Botti Miguel A.l.Marques Institut für Physik Martin-Luther-Universität06120 Halle-WittenbergHalle(Saale)Germany Institut für Festkörpertheorie und-optik Friedrich-Schiller-Universität JenaMax-Wien-Platz 107743 JenaGermany

One of the most exciting tools that have entered the material science toolbox in recent years is machine *** collection of statistical methods has already proved to be capable of considerably speeding up both fundamental and applied *** present,we are witnessing an explosion of works that develop and apply machine learning to sol.d-state *** provide a comprehensive overview and analysis of the most recent research in this *** a starting point,we introduce machine learning principles,algorithms,descriptors,and databases in materials *** continue with the description of different machine learning approaches for the discovery of stable materials and the prediction of their crystal *** we discuss research in numerous quantitative structure–property relationships and various approaches for the replacement of first-principle methods by machine *** review how active learning and surrogate-based optimization can be applied to improve the rational.design process and related examples of *** major questions are always the interpretability of and the physical understanding gained from machine learning *** consider therefore the different facets of interpretability and their importance in materials ***,we propose solutions and future research paths for various challenges in computational materials science.

关键词： learning gained starting

Exchange-correlation functionals for band gaps of sol.ds:benchmark,reparametrization and machine learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 869-885页

作者： Pedro Borl.do Jonathan Schmidt Ahmad W.Huran Fabien Tran Miguel A.l.Marques silvana Botti Institut für Festkörpertheorie und-optik Friedrich-Schiller-Universität Jena and European Theoretical Spectroscopy FacilityMax-Wien-Platz 107743 JenaGermany Institut für Physik Martin-Luther-Universität Halle-Wittenberg06099 HalleGermany Institute of Materials Chemistry Vienna University of TechnologyGetreidemarkt 9/165-TC1060 ViennaAustria

We conducted a large-scale density-functional theory study on the influence of the exchange-correlation functional in the calculation of electronic band gaps of ***,we use the large materials data set that we have recently proposed to benchmark 21 different functionals,with a particular focus on approximations of the meta-generalized-gradient *** these data with the results for 12 functionals in our previous work,we can analyze in detail the characteristics of each approximation and identify its strong and/or weak *** confirming that mBJ,HlE16 and HSE06 are the most accurate functionals for band gap calculations,we reveal several other interesting functionals,chief among which are the local Slater potential approximation,the GGA AK13ldA,and the meta-GGAs HlE17 and *** also compare the computational efficiency of these different *** on these data,we investigate the potential for improvement of a promising subset of functionals by varying their internal *** identified optimal parameters yield a family of functionals fitted for the calculation of band ***,we demonstrate how to train machine learning models for accurate band gap prediction,using as input structural and composition data,as well as approximate band gaps obtained from density-functional theory.

关键词： theory functionals sol.ds

Anti-inflammatory effects ofα-humulene andβ-caryophyllene on pterygium fibroblasts

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) 2022年第12期15卷 1903-1907页

作者： Magda Massae Hata Viveiros Márcia Guimarães Silva JoséGalberto Martins da Costa Anselmo Gomes de Oliveira Carolina Rubio Carlos Roberto Padovani Cláudia Aparecida Rainho silvana Artioli Schellini department of Ophthalmology School of Medicine of BotucatuSão Paulo State University–UNESPBotucatuSao Paulo 18618-000Brazil department of Pathology School of Medicine of BotucatuSão Paulo State University–UNESPBotucatuSao Paulo 01049-010Brazil department of Biological Chemistry Regional University of CaririCratoCeará66100-900Brazil department of Pharmacology School of Pharmaceutical SciencesSão Paulo State University–UNESPAraraquaraSao Paulo 01049-010Brazil Biological Sciences Institute of Biosciences of BotucatuSão Paulo State University–UNESPBotucatuSao Paulo 01049-010Brazil department of Biostatistics São Paulo State University–UNESPBotucatuSao Paulo 01049-010Brazil

AIM:To investigate the anti-inflammatory effects of the sesquiterpenesα-humulene andβ-caryophyllene on pterygium ***:Primary cultures of pterygium fibroblasts were *** passage pterygium fibroblasts were exposed toα-humulene andβ-caryophyllene separately and *** cell viability was assessed by 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide(MTT)assay at 12,24,48,and 72h after *** levels of the inflammatory cytokines interleukin(Il)-1β,Il-6,Il-8,tumor necrosis factor(TNF)-αand Il-10 in the conditioned culture medium were assessed by enzymelinked immunosorbent assay(ElISA)at 12,24 and 48h after *** were statistically analyzed using Friedman repeated measures analysis of variances on ***:The 25μmol/lβ-caryophyllene induced significant decrease in the Il-6 production by pterygium fibroblasts 48h after the exposure(P=0.041).The levels of Il-1β,Il-8,Il-10,and TNF-αwere very low and had no statistically significant variations af ter exposure toα-humulene,β-caryophyllene,or both compounds ***:The exposure to 25μmol/l ofβ-caryophyllene significantly reduce the production of Il-6 by pterygium fibroblasts after *** sesquiterpene may be a potential alternative adjuvant agent for the treatment of pterygium.

关键词： pterygium fibroblasts β-caryophyllene α-humulene cytokines

Hydroethanolic extract of Smallanthus sonchifolius leaves improves hyperglycemia of streptozotocin induced neonatal.diabetic rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2016年第5期9卷 420-424页

作者： Silmara Baroni Bruno Ambrosio da Rocha Juliana Oliveira de Melo Jurandir Fernando Comar silvana Martins Caparroz-Assef Ciomar Aparecida Bersani-Amado department of Pharmacology and Therapeutic State University of MaringaParanaBrazil department of Biochemistry State University of MaringaParanaBrazil

Objective: To evaluate the effect of hydroethanolic extract of yacon on the hyperglycemia induced by streptozotocin(STZ) in neonatal rats. Methods: Wistar rats aged two days old received an intraperitoneal injection of STZ(160 mg/kg); after seven weeks, glycosuria was determined and animals with glucose levels above 250 mg/d l were incl.ded in the study. Groups of diabetic and non-diabetic rats were treated orally with yacon extract at a dose of 400 mg/kg/d for 14 d. Tests were made for phytochemical characterization, glucose tolerance and toxicity. Results: The results showed that treatment with the extract reduced the glucose levels of fed diabetic rats and did not change the glucose levels of fasting diabetic and normal rats. Additionally, also it was observed that treatment with the extract reduced blood glucose levels of diabetic rats during the oral and intravenous glucose tolerance tests. There was no change in body weight, liver enzymes or mortality with yacon extract treatment. The phytochemical screening reveal.d the presence of caffeic acid, chlorogenic acid, ferulic acid and gallic acid. Conclusions: The data suggest that yacon extract reduces hyperglycemia, possibly by improving insulin sensibility through its phytochemicals constituents(phenolic compounds).

关键词： Yacon extract Hyperglycemia Insulin sensibility Streptozotocin

The Concurrence of Hypercholesterolemia and Aging Promotes dNA damage in Apolipoprotein E-deficient Mice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Blood diseases 2012年第3期2卷 51-55页

作者： Sara P dalboni Bianca P Campagnaro Clarissa l Tonini Elisardo C Vasquez silvana S Meyrelles Biotechnology Graduate Program Health Sciences Center Federal University of Espirito Santo Vitoria ES Brazil Biotechnology Graduate Program Health Sciences Center Federal University of Espirito Santo Vitoria ES Brazil dept. Physiological Sciences Health Sciences Center Federal University of Espirito Santo Vitoria ES Brazil dept. Physiological Sciences Health Sciences Center Federal University of Espirito Santo Vitoria ES Brazil Emescam College of Health Sciences ES Brazil

Recent evidence shows that increased oxidative stress and aging contribute to dNA damage in various cardiovascular diseases such as lipid disorders and atherosclerosis. In the present study, we used the comet assay to evaluate the influ- ence of aging on dNA damage in whole blood cells from apolipoprotein E-deficient (apoE?/?) mice and compared the results to those found in cells from wild-type C57Bl/6 (C57) mice. Using the alkaline comet assay and fluorescent ethidium bromide staining, dNA damage was analyzed in the peripheral whole blood (5 μl) cells that were isolated from either young (8-week-old) and elderly (72-week-old) apoE?/? mice or from age-matched C57 mice. The levels of total plasma cholesterol were approximately 6-fold higher in apoE?/? mice of both ages compared to C57 mice. Elderly apoE?/? mice showed significantly higher levels of dNA damage (19%) compared to elderly C57 mice (8%, p d young apoE?/? mice (10%, p le blood cells is a suitable technique for the detection of dNA damage in the apoE?/? mouse;it is an easy, rapid, inexpensive and sensitive method. The novelty of this study is that dNA damage occurring in whole blood cells of this murine model requires the concurrence of aging and oxida- tive stress-related hypercholesterolemia.

关键词： dNA damage Oxidative Stress apoE Knockout Mice Aging Blood Cells

Words apart:Standardizing forestry terms and definitions across European biodiversity studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

森林生态系统:英文版 2023年第4期10卷 459-471页

作者： Giovanni Trentanovi Thomas Campagnaro Tommaso Sitzia Francesco Chianucci Giorgio Vacchiano Christian Ammer MichałCiach Thomas ANagel Miren del Río Yoan Paillet silvana Munzi Kris Vandekerkhove Andrés Bravo-Oviedo Andrea Cutini Ettore d'Andrea Pallieter de Smedt Inken doerfler dimitris Fotakis Jacob Heilmann-Clausen Jeňýk Hofmeister Jan Hošek Philippe Janssen Sebastian Kepfer-Rojas Nathalie Korboulewsky Bence Kovács daniel Kozák Thibault lachat Anders Mårell Radim Matula Martin Mikoláš Björn Nordén PéterÓdor x Marko Perović Elisabeth Pötzelsberger Peter Schall Miroslav Svoboda Flóra Tinya Mariana Ujházyová Sabina Burrascano Research Institute on Terrestrial Ecosystems-National Research Council(IRET-CNR) Via Madonna Del Piano 1950019Sesto FiorentinoFIItaly department of land EnvironmentAgriculture and ForestryUniversitàdegli Studi di PadovaViale Dell’Università1635020LegnaroPDItaly National Biodiversity Future Center Piazza Marina 6190133PalermoItaly CREA Research Centre for Forestry and Wood Viale S.Margherita 8052100ArezzoItaly department of Agricultural and Environmental Sciences(dISAA) University of MilanVia Celoria 220133MilanItaly Silviculture and Forest Ecology of the Temperate Zones University of GöttingenGermany department of Forest Biodiversity Faculty of ForestryUniversity of Agricultureal.29 Listopada 4631-425KrakówPoland department of Forestry and Renewable Forest Resources Biotechnical FacultyUniversity of LjubljanaVecna pot 831000LjubljanaSlovenia Instituto de Ciencias Forestales(ICIFOR-INIA) CSICCtra.de la Coruña Km 7.528040MadridSpain University Grenoble Alpes LessemINRAE2 Rue de la Papeterie38402 Saint-Martin-d'HèresFrance Centro Interuniversitário de História das Ciências e da Tecnologia Faculdade de CiênciasUniversidade de LisboaPortugal Centre for Ecology Evolution and Environmental ChangesFaculdade de Ciências&CHANGE-Global Change and Sustainability InstituteUniversidade de LisboaPortugal Research Institute for Nature and Forest(INBO) Havenlaan 88 Bus 731000BrusselBelgium department of Biogeography and Global Change National Museum of Natural Sciences-CSICC/Serrano 115bis28006MadridSpain Research Institute on Terrestrial Ecosystems-National Research Council(IRET-CNR) Via G.Marconi N.205010PoranoTRItaly Forest&Nature lab Department of EnvironmentGhent UniversityGeraardsbergsesteenweg 2679090GontrodeBelgium Institute of Biology and Environmental Science Vegetation Science&Nature ConservationUniversity of OldenburgAmmerländer Heerstraße 114-11826129OldenburgGermany Forest Research Institute Hellenic Agricultural Organization DimitraVassilikaThessal

Forest biodiversity studies conducted across Europe use a multitude of forestry terms,often *** hinders the comparability across studies and makes the assessment of the impacts of forest management on biodiversity highly *** attempts to standardize forestry and stand description terminology mostly used a top-down approach that did not account for the perspectives and approaches of forest biodiversity *** work aims to establish common standards for silvicultural and vegetation definitions,creating a shared conceptual framework for a consistent study on the effects of forest management on *** have identified both strengths and weaknesses of the silvicultural and vegetation information provided in forest biodiversity *** quantitative data on forest biomass and dominant tree species are frequently incl.ded,information on silvicultural activities and vegetation composition is often lacking,shallow,or based on broad and heterogeneous *** discuss the existing classifications and their use in European forest biodiversity studies through a novel bottom-up and top-driven review process,and ultimately propose a common *** will enhance the comparability of forest biodiversity studies in Europe,and puts the basis for effective implementation and monitoring of sustainable forest management *** standards here proposed are potentially adaptable and applicable to other geographical areas and could be extended to other forest interventions.

关键词： Forest management Multi-taxon Terminology Silviculture data harmonization