检索结果-南通市图书馆

同方期刊数据库

Impact of exercise on markers of b cell-related immunity:A systematic review

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2024年第3期13卷 339-352,I0002页

作者： David Walzik Sergen belen Karen Wilisch Marie Kupjetz silvana Kirschke Tobias Esser Niklas Joisten Alexander Schenk Sebastian Proschinger Philipp Zimmer Division of Performance and Health(Sports Medicine) Institute for Sport and Sport ScienceTU Dortmund UniversityDortmund 44227Germany

background:b cells represent a crucial component of adaptive immunity that ensures long-term protection from infection by generating pathogen-specific *** alters b cell counts and immunoglobulin levels,but evidence-based conclusions on potential benefits for adaptive immunity are *** systematic review assessed current literatures on the impact of acute exercise and exercise training on b cells,immunoglobulins,and markers of secretory immunity in human ***:According to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses(PRISMA)guidelines,MEDLINE,Web of Science,and Embase were searched on March 8,***-randomized controlled trials and crossover trials investigating the impact of acute exercise or exercise training on b cell counts and proportions,immunoglobulin levels,salivary flow rate,or secretory immunoglobulin A secretion rate were *** and reporting of exercise training studies were assessed using the Tool for the Assessment of Study Quality and reporting in *** characteristics,outcome measures,and statistically significant changes were summarized ***:Of the 67 eligible studies,22 applied acute exercise and 45 applied exercise *** included outcomes revealed significant alterations over time in acute exercise and exercise training context,but only a few investigations showed significant differences compared to control *** and plasma immunoglobulin A levels were most consistently increased in response to exercise ***:b cell-related outcomes are altered by acute exercise and exercise training,but evidence-based conclusions cannot be drawn with high confidence due to the large heterogeneity in populations and exercise ***-designed trials with large sample sizes are needed to clarify how exercise shapes b cell-related immunity.

关键词： Antibody b-lymphocyte Exercise Humoral immunity Immune system

Computational screening of materials with extreme gap deformation potentials

在线全文

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 borlido 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 halide 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

Potential Autonomous Selfing in Gesneria citrina (Gesneriaceae),a Specialized Hummingbird Pollinated Species with Variable Expression of Herkogamy

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 2009年第10期51卷 973-978页

作者： Xin-Sheng Chen silvana Marten-Rodriguez Qing-Jun Li Charles b. Fenster Xishuangbanna Tropical botanical Garden the Chinese Academy of Sciences Mengla 666303 China Department of biology University of Maryland College Park MD 20742 USA Herbario de la Universidad de Costa Rica Escuela de Biologia Ciudad Universitaria Rodrigo Facio San Pedro San Jose Costa Rica

Species with mixed mating systems often demonstrate variable expression of breeding system characteristics and thus represent the opportunity to understand the factors and mechanisms that promote both outcrossed and selfed seed production. Here, we investigate variation in levels of herkogamy （variation in stigma-anther separation distance） in a Puerto Rican population of hummingbird pollinated Gesneria citrina Urban. There is significant variation in herkogamy levels among individuals of this species and stigma-anther separation is negatively associated with the ability to set fruits and seeds in the absence of pollinators. The variation in levels of herkogamy may represent a mechanism to ensure the production of some self-fertilized progeny in the absence of hummingbird pollinators. We also describe a novel breeding system in G. citrina, where stamens elongate over time to reach stigma height, but stamen elongation is accelerated by pollination. These results suggest that once the flowers are pollinated, stamen elongation may favor increased pollen removal and siring success, while the reduction in stigma-anther distance no longer imposes the risk of interference between male and female functions. We discuss our findings of breeding system variation in the context of pollination system evolution in an island setting （Antillean islands）.

关键词： mixed-mating pollen limitation pollination system Puerto Rico reproductive assurance stigma-anther separation.

Palm oil biodiesel:An assessment of PAH emissions,oxidative potential and ecotoxicity of particulate matter

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第3期33卷 326-338页

作者： silvana Arias Francisco Molina John R.Agudelo Grupo de Investigación en Gestión y Modelación Ambiental-GAIA Escuela AmbientalFacultad de IngenieríaUniversidad de Antioquia UdeACalle 70 No.52-21MedellínColombia Departamento de Ingeniería Mecánica Universidad de Antioquia UdeA

This work assessed the impact of fuelling an automotive engine with palm biodiesel(pure,and two blends of 10%and 20%with diesel,b100,b10 and b20,respectively)operating under representative urban driving conditions on 17 priority polycyclic aromatic hydrocarbon(PAH)compounds,oxidative potential of ascorbic acid(OP^(AA)),and ecotoxicity through D aphnia pulex mortality *** diluted with filtered fresh air(WD)gathered in a minitunel,and particulate matter(PM)collected directly from the exhaust gas stream(W/oD)were used for *** showed that PM collecting method significantly impact PAH *** all PAH appeared in both,WD and W/oD,higher concentrations were obtained in the last *** biodiesel concentration in the fuel blend decreased all PAH compounds,and those with 3 and 5 aromatic rings were the most *** biodiesel affected both OP^(AA)and *** b10 and b20 exhibited the same rate of ascorbic acid(AA)depletion,b100 showed significant faster oxidation rate during the first four minutes and oxidized 10%more AA at the end of the test.b100 and b20 were significantly more ecotoxic than *** lethal concentration LC50 for b10 was 6.13 mg/*** was concluded that palm biodiesel decreased PAH compounds,but increased the oxidative potential and ecotoxicity.

关键词： biodiesel Particulate matter P emissions Oxidative stress Ecotoxicity Daphnia pulex

Predicting stable crystalline compounds using chemical similarity

在线全文

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,including 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

Axillary lymph node management in breast cancer with positive sentinel lymph node biopsy

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 Clinical Oncology 2015年第1期6卷 1-6页

作者： Ioannis A Voutsadakis silvana Spadafora Division of Medical Oncology Department of Internal Medicine Sault Area Hospital Sault Ste. Marie Ontario ON P6B 0A8 Canada Division of Clinical Sciences Northern Ontario School of Medicine Sudbury Ontario ON P0M Canada

The surgical treatment of localized breast cancer has become progressively less aggressive over the *** management of the axillary lymph nodes has been modified by the introduction of sentinel lymph node biopsy. Axillary dissection can be avoided in patients with sentinel lymph node negative biopsies. based on randomized trials data, it has been proposed that no lymph node dissection should be carried out even in certain patients with sentinel lymph node positive biopsies. This commentary discusses the basis of such recommendations and cautions against a general omission of lymph node dissection in breast cancer patients with positive sentinel lymph node biopsies. Instead, an individualized approach based on axillary tumor burden and biology of the cancer should be considered.

关键词： Tumor sub-types Micro-metastatic Node positive breast cancer Axillary lymph node dissection Macro-metastatic Axillary recurrence

Wetting effects and strength degradation of swelling shale evaluated from multistage triaxial test

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2019年第2期4卷 79-97页

作者： Hayder Mohammed Salim Al-Maamori M.Hesham El Naggar silvana Micic Civil and Environmental Engineering Department The University of Western Ontario1151 Richmond St.LondonOntario N6A 5B9Canada Geotechnical Research Centre Civil and Environmental Engineering DepartmentThe University of Western Ontario1151 Richmond St.LondonOntario N6A 5B9Canada

The multistage triaxial compression test was mainly utilized in this research to investigate the degradation in the strength of swelling shale under different wetting *** samples were tested in four different conditions:(1)under their natural moisture content denoted as intact,and after soaking in,(2)water,(3)polymer solution,and(4)bentonite solution,*** experimental results showed that a considerable decrease in the shale’s strength was noted after soaking in water and the lubricant fluids(LFs).The polymer solution caused the least decrease in the strength compared to other *** envelopes of the tested shale were constructed for intact and soaked *** envelopes showed fair agreement between the single stage and the multistage triaxial compression test results,indicating suitability of the multistage triaxial compression test for the tested swelling shale.

关键词： Multistage Triaxial compression Swelling shale Strength degradation Strength envelopes

Exchange-correlation functionals for band gaps of solids: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 borlido 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 solids

Ultrastructure of multicellular dwarf males with external gametangium in Oedogonium macrandrium(Oedogoniales,Chlorophyta)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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