检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 947-962页

作者： N.IQBAL j.CHOI S.F.SHAH C.LEE S.LEE Department of Mechanical Roboticsand Energy EngineeringDongguk University-SeoulSeoul 04620Republic of Korea

A chemo-mechanical model is developed to investigate the effects on the stress development of the coating of polycrystalline Ni-rich LiNixMnyCo_(z)O_(2)(x≥0.8)(NMC)particles with poly(3,4-ethylenedioxythiophene)(PEDOT).The simulation results show that the coating of primary NMC particles significantly reduces the stress generation by efficiently accommodating the volume change associated with the lithium diffusion,and the coating layer plays roles both as a cushion against the volume change and a channel for the lithium transport,promoting the lithium distribution across the secondary particles more ***,the lower stiffness,higher ionic conductivity,and larger thickness of the coating layer improve the stress *** paper provides a mathematical framework for calculating the chemo-mechanical responses of anisotropic electrode materials and fundamental insights into how the coating of NMC active particles mitigates stress levels.

关键词： lithium-ion battery(lib) polycrystalline particle coating finite element simulation Ni-rich LiNixMnyCo_(z)O_(2)(x>0.8)(NMC)

维普期刊数据库

PREPARATION AND XRD STUDy OF LITHIUM DEFICIENT lib COMPOUND

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第5期17卷 667-671页

作者： Z.j.Liu B.y.Huang Z.y.Li StateKeyLaboratoryforPowderMetallurgy CentralSouthUniversityChangsha410083China

The lib compounds in lithium deficient state were prepared by three methods and its crystal structure was investigated by using XRD. It is found that the lattice constant c of the compound will increase step by step with decreasing Li content from 0.2796nm of the normal lib to 0.2886, 0.2981 and 0.3118nm of the lithium deficient lib. The change of the lattice constant is reversible.

关键词： lib compound crystal structure electrode materials X-ray diffraction

维普期刊数据库

LC-MS Phytochemical Profiles of Phenolic Compounds and Antimicrobial, Antioxidant, and Antiplasmodial Activities of Ethanol Extracts of Pycnostachys erici-rosenii *** and Leucas martinicensis (j.ck.) *** (Lamiaceae)

在线全文

学校读者我要写书评

暂无评论

Advances in Biological Chemistry 2023年第6期13卷 209-227页

作者： Uwikunda Serondo Héritier Nizigiyimana libérata Pius Tshimankinda Mpiana Nyamangyoku Ishibwela Obedi Ngezahayo j.rémie Dan Cristian Vodnar Daniela Hanganu Ioana Matei Sanda Andrei Department of Chemistry Faculty of Sciences Institut Supérieur Pédagogique de Bukavu Bukavu Democratic Republic of Congo Centre de Recherche en Sciences Naturelles et de l’Environnement (CRSNE) Faculté des Sciences Université du Burundi Bujumbura Burundi Department of Preclinical Sciences Faculty of Veterinary Medicine University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca Cluj-Napoca Romania Ecole Doctorale de l’Université du Burundi Bujumbura Burundi Department of Chemistry Faculty of Sciences Université de Kinshasa Kinshasa Democratic Republic of Congo Faculty of Agriculture Université Catholique de Bukavu Bukavu Democratic Republic of Congo Department of Food Science Faculty of Food Science and Technology University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca Cluj-Napoca Romania Department of Pharmacognosy Faculty of Pharmacy University of Medicine and Pharmacy “Iuliu Hatieganu” Cluj-Napoca Romania Department of Microbiology Mycology and Immunology Faculty of Veterinary Medicine University of Agricultural Science and Veterinary Medicine Cluj-Napoca Romania

This study has been conducted to analyze the chemical composition and antimicrobial, antioxidant and antiplasmodial properties of ethanol extracts of Pycnostachys erici-rosenii *** and Leucas martinicensis (j.ck.) *** that are not yet well known. The HPLC-DAD-MS-ESI+ method was used to investigate the chemical profile, the disc diffusion and microdilution method for the antimicrobial activities, the DPPH and FRAP assays for antioxidant property and SyBR Green I-based growth inhibition assay on Pf 3D7 (CQ-sensitive) strain for antiplasmodial properties. The results indicated significant amounts of hydroxybenzoic acid, flavonol and hydroxycinnamic acid in the two species. The total polyphenols analysis gave 209.0 ± 16.1 mg GAE/100g DW for P. erici-rosenii and 175.3 ± 1.6 mg GAE/100g DW for L. martinicensis while for total flavonoids analysis 33.4 ± 1.8 mg TE/100g DW was found for P. erici-rosenii and 39.6 ± 0.6 mg TE/100g DW for L. martinicensis. Moreover, antimicrobial tests revealed 0.125 mg/mL on E. faecalis ATCC25922 for ethanol extracts P. erici-rosenii and L. martinicensis. The antioxidant assays revealed IC50 56.17 μg/mL and 78.43 μg/mL for DPPH assay, and 112.03 μM TE/100mL and 90.46 μM TE/100mL) for FRAP assay for ethanol extracts of P. erici-rosenii and L. martinicensis respectively. Finally, for Antiplasmodial activity, IC50 was 4.07 μg/mL for P. erici-rosenii and 12.29 μg/mL for L. martinicensis. Therefore, the antimicrobial, the antioxidant, and the antiplasmodial results suggest that the ethanolic extracts of the aerial parts of P. erici-rosenii and L. martinicensis contain compounds with antimicrobial, antioxidant, and antiplasmodial properties, which can be searched in new drug discovery for treatment of infectious diseases.

关键词： Pycnostachys erici-rosenii Leucas martinicensis Phytochemical Profile Antimicrobial Activity Antioxidant Activity Antiplasmodial Activity

Effect of Mitochondrial Dysfunction on Carbon Metabolism and Gene Expression in Flower Tissues of Arabidopsis thaliana

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2011年第1期4卷 127-143页

作者： Maria V. Busi Maria E. Gomez-Lobato Sebastian P. Rius Valeria R. Turowski Paula Casati Eduardo j. Zabaleta Diego F. Gomez-Casati Alej.ndro Araya Instituto de Investigaciones Biotecnologicas-lnstituto Tecnologico de ChascomOs (IIB-INTECH) CONICET/UNSAM Chascomus Argentina Centro de Estudios Fotosinteticos y Bioquimicos (CEFOBI) Universidad Nacional de Rosario Argentina Instituto de Investigaciones Biologicas lib CONICET-Universidad Nacional de Mar del Plata Argentina Microbiologie Cellulaire et Moleculaire et Pathogenicite UMR 5234 Centre National de la Recherche Scientifique and Universite Victor Segalen-Bordeaux 2 Bordeaux France

We characterized the transcriptomic response of transgenic plants carrying a mitochondrial dysfunction induced by the expression of the unedited form of the ATP synthase subunit 9. The u-ATP9 transgene driven by A9 and APETALA3 promoters induce mitochondrial dysfunction revealed by a decrease in both oxygen uptake and adenine nucleo- tides （ATP, ADP） levels without changes in the ATIP/ADP ratio. Furthermore, we measured an increase in ROS accumulation and a decrease in glutathione and ascorbate levels with a concomitant oxidative stress response. The transcriptome analysis of young Arabidopsis flowers, validated by qRT-PCR and enzymatic or functional tests, showed dramatic changes in u-ATP9 plants. Both lines display a modification in the expression of various genes involved in carbon, lipid, and cell wall metabolism, suggesting that an important metabolic readj.stment occurs in plants with a mitochondrial dysfunction. Interestingly, transcript levels involved in mitochondrial respiration, protein synthesis, and degradation are affected. More- over, the levels of several mRNAs encoding for transcription factors and DNA binding proteins were also changed. Some of them are involved in stress and hormone responses, suggesting that several signaling pathways overlap. Indeed, the tran- scriptome data revealed that the mitochondrial dysfunction dramatically alters the expression of genes involved in signaling pathways, including those related to ethylene, absicic acid, and auxin signal transduction. Our data suggest that the mitochondrial dysfunction model used in this report may be useful to uncover the retrograde signaling mechanism between the nucleus and mitochondria in plant cells.

关键词： Electron transport transcriptome analysis Arabidopsis.

Lithium bis(trifluoromethanesulfonyl)imide blended in polyurethane acrylate photocurable solid polymer electrolytes for lithium-ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

j.urnal of Energy Chemistry 2021年第11期30卷 485-496,I0011页

作者： Cristian Mendes-Felipe j.C.Barbosa R.Gonsalves D.Miranda C.M.Costa j.L.Vilas-Vilela S.Lanceros-Mendez BCMaterials Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park48940 LeioaSpain Macromolecular Chemistry Group(LABQUIMAC) Department of Physical ChemistryFaculty of Science and TechnologyUniversity of the Basque Country(UPV/EHU)Barrio Sarriena s/nE-48940 LeioaSpain Center of Physics University of MinhoCampus of Gualtar4710-057 BragaPortugal Center of Chemistry University of MinhoCampus of Gualtar4710-057 BragaPortugal Ai–School of Technology IPCABarcelosPortugal Ikerbasque Basque Foundation for Science48009 BilbaoSpain

The increased demand of electronic devices promotes the development of advanced and more efficient energy storage devices, such as batteries. Lithium-ion batteries (libs) are the most studied battery systems due to their high performance. Among the different battery components, the separator allows the control of lithium ion diffusion between the electrodes. To overcome some drawbacks of liquid electrolytes, including safety and environmental issues, solid polymer electrolytes (SPEs) are being developed. In this work, a UV photocurable polyurethane acrylate (PUA) resin has been blended with lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) up to 30 wt% LiTFSI content to reach a maximum ionic conductivity of 0.0032 mS/cm at room temperature and 0.09 mS/cm at 100 ℃. Those values allowed applying the developed materials as photocurable SPE in Swagelok type Li/C-LiFePO_(4) half-cells, reaching a battery discharge capacity value of 139 mAh.g^(−1) at C/30 rate. Those results, together with the theoretical studies of the discharge capacity at different C-rates and temperatures for batteries with LiTFSI/PUA SPE demonstrate the suitability of the developed photocurable SPE for lib applications.

关键词： Solid polymer electrolytes Photocuring Polyurethane acrylate LiTFSI Li-ion batteries

维普期刊数据库

Electrochemical performance of thermally-grown SiO2 as diffusion barrier layer for integrated lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2018年第2期12卷 225-232页

作者： X.D.HUANG X.F.GAN Q.A.HUANG j.Z.yANG Key Laboratory of MEMS of the Ministry of Education School of Electronic Science and EngineeringSoutheast UniversityNanjing 210096China School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Direct integration of lithium-ion battery （lib） with electronic devices on the same Si substrate can significantly miniaturize autonomous micro systems. For achieving direct integration, a barrier layer is essential to be inserted between lib and the substrate for blocking Li^＋ diffusion. In this paper, the feasibility of thermal SiOa film as the barrier layer is investigated by electrochemical characterization and X-ray photoelectron spectroscopy （XPS）. Due to the negligible side reactions of thermal SiO2 with electrolyte, the solid electrolyte interphase （SEI） layer formed on the surface of the barrier layer is thin and the SEI content mainly consists of hydrocarbon together with slight polyethylene oxide （PEO）, LixPOyFz, and Li2CO3. Although 8-nm thermal SiO2 effectively prevents the substrate from alloying with Li^＋, the whole film changes to Li silicate after electrochemical cycling due to the irreversible chemical reactions of SiO2 with electrolyte. This degrades the performance of the barrier layer against the electrolyte penetration, thus leading to the existence of Li^＋（in the form of F-Si-Li） and solvent decompositions （with the products of hydrocarbon and PEO） near the barrier layer/substrate interface. Moreover, it is found that the reaction kinetics of thermal SiO2 with electrolyte decrease significantly with increasing the SiO2 thickness and no reactions are found in the bulk of the 30-nm SiO2 film. Therefore, thermal SiO2 with an appropriate thickness is a promising barrier layer for direct integration.

关键词： autonomous micro system direct integration barrier layer thermal SiO2 film X-ray photoelectron spectroscopy (XPS)

Epitaxial Growth of Bi-2201 and 2212 Thin Films by Magnetron Sputering

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电子显微学报 1997年第4期 113-114页

作者： y.Z.Zhang\ D.G.yang\ L.Li\ B.R.Zhao\ H.Chen\ C.Dong H.j.Tao\ H.T.yang\ j.W.Li\ B.yin\ S.L.j.a\ X.Z.Zhao (National Laboratory for superconductivity, Institute of Physics Chinese Academy of Sciences, Beij.ng 100080, P.R.China)

ＥｐｉｔａｘｉａｌＧｒｏｗｔｈｏｆＢｉ２２０１ａｎｄ２２１２ＴｈｉｎＦｉｌｍｓｂｙＭａｇｎｅｔｒｏｎＳｐｕｔｅｒｉｎｇＹ．Ｚ．ＺｈａｎｇＤ．Ｇ．ＹａｎｇＬ．ＬｉＢ．Ｒ．ＺｈａｏＨ．ＣｈｅｎＣ．ＤｏｎｇＨ．Ｊ．Ｔａｏ... 详细信息

ＥｐｉｔａｘｉａｌＧｒｏｗｔｈｏｆＢｉ２２０１ａｎｄ２２１２ＴｈｉｎＦｉｌｍｓｂｙＭａｇｎｅｔｒｏｎＳｐｕｔｅｒｉｎｇＹ．Ｚ．ＺｈａｎｇＤ．Ｇ．ＹａｎｇＬ．ＬｉＢ．Ｒ．ＺｈａｏＨ．ＣｈｅｎＣ．ＤｏｎｇＨ．Ｊ．ＴａｏＨ．Ｔ．ＹａｎｇＪ．Ｗ．ＬｉＢ．Ｙ...

关键词： Thin Films Magnetron

Green Production of Planar Aligned Dense 2D Nano-oxides on CNT Paper by Ultrafast Laser-Induced High-Pressure Photochemistry for Stable High-Rate lib Anodes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy Material Advances 2023年第1期4卷 67-76页

作者： j.n Xu Sen Xiang Chenqi yi Xingtao Liu Licong An Ziyu Wang Haoqing j.ang Gary j.Cheng School of Industrial Engineering Purdue UniversityWest LafayetteIN 47906USA The Institute of Technological Sciences Wuhan UniversityWuhan 430072China

Green production of functional nano-oxides on a large scale is crucial for the modern manufacturing *** hydrothermal methods and ball milling are usually time-consuming and require long-term energy input with undesired ***,an ultrafast laser-induced high-pressure photochemistry manufacturing technique is developed to massively produce planar-aligned graphenecoated two-dimensional(2D)SnO_(2) nanoplatelet on carbon nanotube(CNT)paper under the green chemistry *** unique design of Z-axis confinement added to the ultrafast laser irradiation provides an exceptional high temperature of 1772 K and a high pressure of 24 GPa in the localized laser plasma *** transient nonequilibrium condition controls the formation of 2D SnO_(2),and the ablated C atoms cool down afterward as in-situ“glue”to intactly seal the oxides on the CNT *** resultant hierarchical Graphene@2D SnO_(2)@CNT paper anode for Li-ion battery has an outstanding capacity of 819 mAh g^(−1)(1637 mAh cm^(−3))at 0.5 A g^(−1) and retains 622 mAh g^(−1)(1245 mAh cm^(−3))at 5.0 A g^(−1).The high capacity at 0.5 A g^(−1) has a retention of 92%after 600 *** work provides an environmental-friendly scalable manufacturing technique to produce functional nanocomposites in 1 step.

关键词： oxides exceptional consuming

Effect of Helicobacter pylori on gastric epithelial 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

World j.urnal of Gastroenterology 2014年第36期20卷 12767-12780页

作者： Shatha Alzahrani Taslima T Lina j.zmin Gonzalez Irina V Pinchuk Ellen j.Beswick Victor E Reyes Department of Microbiology and Immunology University of Texas Medical Branch Galveston TX 77555 United States MSIII School of Medicine University of Texas Medical Branch Galveston TX 77555 United States Department of Internal Medicine University of Texas Medical Branch Galveston TX 77555 United States Departments of Molecular Genetics and Microbiology University of New Mexico Health Sciences Center Albuquerque NM 87131 United States Departments of Pediatricsand and Microbiology and Immunology University of Texas Medical Branch Galves-ton TX 77555 United States

The gastrointestinal epithelium has cells with features that make them a powerful line of defense in innate mucosal immunity. Features that allow gastrointestinal epithelial cells to contribute in innate defense include cell barrier integrity, cell turnover, autophagy, and innate immune responses. Helicobacter pylori (H. pylori) is a spiral shape gram negative bacterium that selectively colonizes the gastric epithelium of more than half of the world’s population. The infection invariably becomes persistent due to highly specialized mechanisms that facilitate H. pylori’s avoidance of this initial line of host defense as well as adaptive immune mechanisms. The host response is thus unsuccessful in clearing the infection and as a result becomes established as a persistent infection promoting chronic inflammation. In some individuals the associated inflammation contributes to ulcerogenesis or neoplasia. H. pylori has an array of different strategies to interact intimately with epithelial cells and manipulate their cellular processes and functions. Among the multiple aspects that H. pylori affects in gastric epithelial cells are their distribution of epithelial j.nctions, DNA damage, apoptosis, proliferation, stimulation of cytokine production, and cell transformation. Some of these processes are initiated as a result of the activation of signaling mechanisms activated on binding of H. pylori to cell surface receptors or via soluble virulence factors that gain access to the epithelium. The multiple responses by the epithelium to the infection contribute to pathogenesis associated with H. pylori.

关键词： Helicobacter pylori Apoptosis Gastric epithelial cells Proinflammatory cytokines Chronic inflammation Gastric diseases Gastric cancer

Immune evasion strategies used by Helicobacter pylori

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 j.urnal of Gastroenterology 2014年第36期20卷 12753-12766页

作者： Taslima T Lina Shatha Alzahrani j.zmin Gonzalez Irina V Pinchuk Ellen j.Beswick Victor E Reyes Department of Microbiology and Immunology University of Texas Medical Branch Galveston TX 77555 United States MS-III School of Medicine University of Texas Medical Branch Galveston TX 77555 United States Department of Internal Medicine University of Texas Medical Branch Galveston TX 77555 United States Departments of Molecular Genetics and Microbiology University of New Mexico Health Sciences Center Albuquerque NM 87131 United States Departments of Pediatrics and Microbiology and Immunology University of Texas Medical Branch Galveston TX 77555 United Statest

Helicobacter pylori(H. pylori) is perhaps the most ubiquitous and successful human pathogen, since it colonizes the stomach of more than half of humankind. Infection with this bacterium is commonly acquired during childhood. Once infected, people carry the bacteria for decades or even for life, if not treated. Persistent infection with this pathogen causes gastritis, peptic ulcer disease and is also strongly associated with the development of gastric cancer. Despite induction of innate and adaptive immune responses in the infected individual, the host is unable to clear the bacteria. One widely accepted hallmark of H. pylori is that it successfully and stealthily evades host defense mechanisms. Though the gastric mucosa is well protected against infection, H. pylori is able to reside under the mucus, attach to gastric epithelial cells and cause persistent infection by evading immune responses mediated by host. In this review, we discuss how H. pylori avoids innate and acquired immune response elements, uses gastric epithelial cells as mediators to manipulate host T cell responses and uses virulence factors to avoid adaptive immune responses by T cells to establish a persistent infection. We also discuss in this review how the genetic diversity of this pathogen helps for its survival.

关键词： Helicobacter pylori Immune response Pattern recognition receptors Phagocytes T cells Antigen presenting cells Gastric epithelial cells Vacuolating cytotoxin T4SS