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Translocation of chicken heart apocytochrome c and its mutants (c17S, H18D) across mitochondrial membrane

Science china(Life Sciences) 1999年第1期42卷 1-7页

作者：朱勇韩学海杨福愉 1. National Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences 100101 Beijing China

The dependence of import of chicken heart apocytochrome c on its transformation to holoform by heme attachment was studied. Results showed that there was no difference in the translocation of apocytochrome c across the mitochondrial membrane in the presence or absence of hemin + dithionite. Furthermore, two heme unattached mutants (H18D, c17S) were prepared, which could still be accumulated in mitochondria, but their import velocity was obviously reduced.

关键词： chicken heart apocytochrome c mutants H18D c17S translocation across mitochondrial membrane.

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Design and fabrication of c-Mn_0.5cd_0.5S/cu3P ternary heterojunction catalyst for photocatalytic hydrogen evolution

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2021年第59期46卷 30382-30392页

作者： Fang, Ningjie Song, Xincheng Zhang, Mingyue chu, Yinghao Sichuan Univ Coll Architecture & Environm Chengdu 610065 Sichuan Peoples R China Natl Engn Technol Res Ctr Flue Gas Desulfurizat Chengdu 610065 Sichuan Peoples R China

Photocatalytic hydrogen evolution from water splitting is a promising strategy to solve the energy demand of human beings. Here, we first designed a c-Mn0.5cd0.5S/cu3P ternary heterojunction catalyst for photocatalytic hydrogen production. The results show that the combination of c and cu3P can effectively improve the photocatalytic activity of Mn0.5cd0.5S. c-Mn0.5cd0.5S loading with 5 wt% cu3P exhibits the highest hydrogen evolution rate (44.1 mmol g(-1) h(-1)), which is 3.2 and 2.8 times higher than that of pure Mn0.5cd0.5S (13.7 mmol g(-1) h(-1)) and Mn0.5cd0.5S/3 wt%Pt (15.6 mmol g(-1) h(-1)), respectively. In addition, it shows a high hydrogen evolution rate (19.6 mmol g(-1) h(-1)) under visible light (>= 420 nm) irritation and the apparent quantum efficiency (AQE) is detected to be 3.2% at 420 nm. The enhanced photocatalytic activity can be attributed to the good conductivity of c and the formation of p-n heterojunction, which is beneficial for light harvesting and the separation and transportation of charge carriers. Besides, a possible mechanism is proposed. This work provides an effective way to improve the photocatalytic activity of Mn0.5cd0.5S by using non noble metal co-catalysts. (c) 2021 Hydrogen Energy Publications LLc. Published by Elsevier Ltd. All rights reserved.

关键词： Photocatalytic Hydrogen evolution c cu 3 P Mn 0 5 cd 0 5 S

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One-step combustion synthesis of c/MgO composite powders with MgO nanofibers

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cERAMIcS INTERNATIONAL 2021年第10期47卷 13704-13714页

作者： Li, Kaidi Xiao, Guoqing Ding, Donghai chong, Xiaochuan Luo, Jiyuan chen, Xing Bai, Bing Ren, Yun Xian Univ Architecture & Technol Coll Mat Sci & Engn Xian 710055 Peoples R China

c/MgO composite powders were prepared by combustion synthesis using magnesium oxalate and magnesium powders as raw materials. The phase composition and microstructure of the composite powders were investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy/energy dispersive spectroscopy (FESEM/EDS), high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. The synthetic mechanism was explored through TG-FTIR and combustion front quenching techniques. It was found that the c/MgO composite powders contained a large quantity of MgO nanofibers. When the molar ratio of magnesium oxalate and magnesium was 1:4, the carbon content of the product reached a maximum of 9.45 wt %. In the composite powders, cubic MgO particles were encapsulated by a thin carbon layer, and there was a tiny gap between MgO and the carbon layer;a large number of MgO nanofibers with aspect ratios of 80?100 were found. The cubic MgO particles of the products are the direct decomposition of Mgc2O4, and the MgO nanofibers are the reaction product of gaseous Mg and cO2/cO at high temperature. Meanwhile, the carbon deposited on the MgO particles can inhibit the grain growth of MgO particles and result in the refinement of MgO particles. The uniform dispersion of carbon and the weak c/MgO interface combine, making the composite powders a potential additive for low-carbon MgO?c refractories with excellent thermal shock resistance.

关键词： combustion synthesis c MgO composite Powders MgO nanofibers

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Preparation and mechanical properties of c/c composites reinforced with arrayed Sic columnar pins

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cERAMIcS INTERNATIONAL 2021年第17期47卷 24262-24269页

作者： Jia, Jiangang Ju, Jiakang Liu, Shunwei Ji, Genshun State Key Lab Adv Proc & Recycling Nonferrous Met Lanzhou Peoples R China Lanzhou Univ Technol Sch Mat Sci & Engn Lanzhou 730050 Peoples R China

c/c composites with Sic columnar pins were fabricated by a recently developed space-holder method. Effects of Sic columnar pins with pins-row spacing of 5 mm and 4 mm on mechanical properties and toughening of c/c composites were characterized and discussed. corresponding porous c/c composite matrices were also characterized. The results show that introduction of Sic columnar pins not only improves the compressive and shear properties of c/c composites, but significantly affects the Pyc texture of the c/c composite matrix. Under identical TG-cVI deposition conditions, the pristine c/c composites (S0), the unidirectional porous c/c composites (S1 and S2), and the c/c composites with Sic columnar pins (S3 and S4) show typical low-textured Pyc, high-textured Pyc, and medium-textured Pyc, respectively. The mechanical properties of unidirectional porous c/c composites with channels-row spacing of 5 mm (S1) are higher than those of unidirectional porous c/c composites with channels-row spacing of 4 mm (S2). conversely, for the c/c composites with Sic columnar pins, the mechanical properties of samples with columns-row spacing of 5 mm (S3) are lower than those with columnsrow spacing of 4 mm (S4). Moreover, the compressive strength P//(load direction parallel to the channel), P perpendicular to (load direction vertical to the channel), and shear strength of S3 and S4 is respectively higher than that of S1. Therefore, introduction of Sic columnar pins can effectively improve the mechanical properties of composites without significantly changing the density.

关键词： c c composites Sic columnar pins Shear strength compressive strength

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The influence of heat treatment on the ablation behavior of the c/cx-Sicy composites tested by thin-blade under oxyacetylene torch

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cERAMIcS INTERNATIONAL 2022年第15期48卷 22523-22533页

作者： Liu, Ningkun Guo, Lingjun Kou, Gang Li, Yunyu Yin, Xuemin Northwestern Polytech Univ Shaanxi Key Lab Fiber Reinforced Light Composite M Xian 710072 Peoples R China

c/cx-Sicy composites are one of the most promising counterparts of c/c composites as they maintain the mechanical strength of c/c composites while providing excellent anti-ablation properties at the same time. This paper reports that the composites could exhibit even better anti ablation properties after heat treatment. The materials were heat-treated and then tested with a thin-blade oxyacetylene torch without the protection of any coatings. The 1600 degrees c heat-treated thin-blade specimen could sustain the ablation of the oxyacetylene torch with a temperature of 1776 degrees c (80 degrees c higher than the original material without heat treatment) and a lower liner ablation rate (1.31 mu m/s) than the original material (1.66 mu m/s). An extreme ablation test was also conducted at around 2400 degrees c, and the 1600 degrees c heat-treated specimen exhibited a lower linear ablation rate (13 mu m/s) than the original specimen (47 mu m/s). The influence of the heat treatment on the crystallinity of the matrix is studied with the additional help of Raman spectroscopy and XPS. The ablation mechanism is discussed in detail, and the fluent condition of the thin-blade specimen is simulated. The paper also reports a different ablation behavior of the 1600 degrees c heat-treated specimen from the material without heat treatment to explain their excellent ablation property.

关键词： Graphitization c cx-Sicy composites Ablation property c composites Heat treatment

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HYDRATION MEcHANISM OF THE c3S WITH THE APPLIcATION OF THE SLOW EVAPORATION TEcHNIQUE IN ITS LIQUID-PHASE

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cEMENT AND cONcRETE RESEARcH 1986年第4期16卷 472-480页

作者： GOLDScHMIDT, A Laboratorio de Microanálisis Departamento de Geología Facultad de Ciencias Físicas y Matemáticas Universidad de Chile Casilla 13518 Correo 21 Santiago Chile

The morphology and chemical composition of the evaporation products of the liquid phase and the c 3 S paste were studied by Microprobe (EPMA) and Scanning Flectron Microscope (SEM). Results that support those of previous research were obtained, increasing these, since it was proved — by means of my research in a direct way, that morphologically and chemically speaking, products of c 3 S hydration and the ones obtained through slow evaporation of the liquid phase of the c 3 S water are different. chemically, in these products of evaporation, no correlation was found between the Si and ca, which appears to be an argument in favor of the topochemical hydration theory.

关键词： S SiO 2 c caO H H 2 O A A1 2 O 3

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Designed formation of c/Fe3O4@Ni(OH)2 cathode with enhanced pseudocapacitance for asymmetric supercapacitors

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JOURNAL OF cOLLOID AND INTERFAcE ScIENcE 2023年第1期635卷 176-185页

作者： Lv, Hui Xiao, Zuoyi Zhai, Shangru Wang, Xuting Hao, Jingai An, Qingda Dalian Polytech Univ Coll Light Ind & Chem Engn Liaoning Collaborat Innovat Ctr Lignocellulos Bior Liaoning Key Lab Lignocellulose Chem & Biomat Dalian 116034 Peoples R China

The rational design and synthesis of advanced electrode materials are significant for the applications of supercapacitors. Ferroferric oxide (Fe3O4), with its high theoretical capacitance is a renowned cathode material. Nevertheless, its low electronic conductivity and poor cycling stability during a long-term charge/discharge process limit its large-scale applications. In this work, the precise modulation of multiple components was reported to enhance electrochemical performance. The ternary heterostructures were fabricated by wrapping ultrathin nickel hydroxide (Ni(OH)2) nanosheets on the surfaces of Fe3O4 nanoparticles-loaded on sodium carboxymethyl cellulose (cMc)-derived porous carbon, named as c/ Fe3O4@Ni(OH)2. Due to the large specific surface area and excellent conductivity of cMc-derived porous carbon and the abundant reaction sites of Ni(OH)2 nanosheets, the optimized c/Fe3O4@Ni(OH)2-1.0 sample exhibited the highest specific capacitance of 3072F g-1 at a current density of 0.5 A g-1. Furthermore, the assembled asymmetric supercapacitor (ASc) with activated carbon and c/Fe3O4@Ni(OH)2-1.0 as the negative and positive electrodes, respectively, showed an energy density of 123 W h kg-1 at 381 W kg-1, and a long-life stability with an excellent capacitance retention of 90.04 % after 10,000 cycles. The route for preparing composite electrode materials proposed in this work provides a reference for realizing highperformance energy storage devices.(c) 2022 Elsevier Inc. All rights reserved.

关键词： cMc Supercapacitor c Ni(OH)2 nanosheet

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SYNERGY IN cDMOO4/MOO3 cATALYSTS IN PARTIAL OXIDATION REAcTIONS OF c-4 HYDROcARBONS

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APPLIED cATALYSIS 1990年第1期62卷 105-117页

作者： OZKAN, US GILL, Rc SMITH, MR Department of Chemical Engineering The Ohio State University Columbus OH 43210 U.S.A.

The synergy in cdMoO 4 /MoO 3 catalysts has been investigated in selective oxidation of c 4 hydrocarbons. Both of the pure phases, MoO 3 and cdMoO 4 , as well as the two-phase catalyst have been characterized using X-ray diffraction, BET surface area measurement, scanning electron microscopy and laser Raman spectroscopy. Oxidation studies performed over the cdMoO 4 /MoO 3 catalyst and its pure-phase constituents, using both 1-butene and 1,3-butadiene as feed material, show that the two-phase catalyst had a higher selectivity to maleic anhydride than either of the pure phases. This synergistic effect is similar to the one previously observed over MnMoO 4 /MoO 3 catalysts.

关键词： cadmium-molybdenum oxide molybdenum oxide maleic anhydride catalyst preparation (impregnation precipitation) catalyst characterization (BET LRS SEM XRD) selectivity (maleic anhydride) c 4 hydrocarbons.

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A monolithic optimal control method for displacement tracking of cosserat rod with application to reconstruction of c. elegans locomotion

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cOMPUTATIONAL MEcHANIcS 2023年第3期71卷 409-432页

作者： Wang, Yongxing Ranner, Thomas Ilett, Thomas P. Xia, Yan cohen, Netta Univ Leeds Sch Comp Leeds W Yorkshire England Univ Leeds Ctr Computat Imaging & Simulat Technol Biomed CIS Leeds W Yorkshire England

This article considers an inverse problem for a cosserat rod where we are given only the position of the centreline of the rod and must solve for external forces and torques as well as the orientation of the cross sections of the centreline. We formulate the inverse problem as an optimal control problem using the position of the centreline as an objective function with the external force and torque as control variables, with meaningful regularisation of the orientations. A monolithic, implicit numerical scheme is proposed in the sense that primal and adjoint equations are solved in a fully-coupled manner and all the nonlinear coefficients of the governing partial differential equations are updated to the current state variables. The forward formulation, determining rod configuration from external forces and torques, is first validated by a numerical benchmark;the solvability and stability of the inverse problem are then tested using data from forward simulations. The proposed optimal control method is motivated by reconstruction of the orientations of a rod's cross sections, with its centreline being captured through imaging protocols. As a case study, we take the locomotion of the nematode, caenorhabditis elegans. In this study we take laboratory data for its centreline and infer its cross-section orientation (muscle locations) with the control force and torque being interpreted as the reaction force, activated by c. elegans' muscles, from the surrounding fluids. This method thus combines the mathematical modelling and laboratory data to study the locomotion of c. elegans, which gives us insights into the potential anatomical orientation of the worm beyond what can be observed through the laboratory data. The paper is completed with several additional remarks explaining the theoretical and technical details of the model.

关键词： Optimal control cosserat rod Finite element c elegans Locomotion

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The factor H variant associated with age-related macular degeneration (His-384) and the non-disease-associated form bind differentially to c-reactive protein, fibromodulin, DNA, and necrotic cells

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JOURNAL OF BIOLOGIcAL cHEMISTRY 2007年第15期282卷 10894-10900页

作者： Sjoberg, Andreas P. Trouw, Leendert A. clark, Simon J. Sjolander, Jonatan Heinegard, Dick Sim, Robert B. Day, Anthony J. Blom, Anna M. Lund Univ Dept Lab Med Sect Med Prot Chem Malmo Univ Hosp S-20502 Malmo Sweden Univ Oxford Dept Biochem MRC Immunochem Unit Oxford OX1 3QU England Lund Univ Dept Expt Med Sci S-22184 Lund Sweden Univ Manchester Fac Life Sci Manchester M13 9PT Lancs England

Recently, a polymorphism in the complement regulator factor H (FH) gene has been associated with age-related macular degeneration. When histidine instead of tyrosine is present at position 384 in the seventh complement control protein (ccP) domain of FH, the risk for age-related macular degeneration is increased. It was recently shown that these allotypic variants of FH, in the context of a recombinant construct corresponding to ccPs 6 - 8, recognize polyanionic structures differently, which may lead to altered regulation of the alternative pathway of complement. We show now that His-384, corresponding to the risk allele, binds c-reactive protein (cRP) poorly compared with the Tyr-384 form. We also found that c1q and phosphorylcholine do not compete with FH for binding to c-reactive protein. The interaction with extracellular matrix protein fibromodulin, which we now show to be mediated, at least in part, by ccP6 - 8 of FH, occurs via the polypeptide of fibromodulin and not through its glycosaminoglycan modifications. The Tyr-384 variant of FH bound fibromodulin better than the His-384 form. Furthermore, we find that ccP6 - 8 is able to interact with DNA and necrotic cells, but in contrast the His-384 allotype binds these ligands more strongly than the Tyr-384 variant. The variations in binding affinity of the two alleles indicate that complement activation and local inflammation in response to different targets will differ between His/His and Tyr/Tyr homozygotes.

关键词： c-Reactive Protein complement Factor H DNA Extracellular Matrix Proteins c

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