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Influence of c-O-H Volatiles on Ni, co, and P Partition between Silicate Melt and Liquid Metal Fe Alloy at 4 GPa, 1550°c

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GEOcHEMISTRY INTERNATIONAL 2020年第6期58卷 670-686页

作者： Lukanin, O. A. Tsekhonya, T. I. Koltashev, V. V. Kononkova, N. N. Russian Acad Sci Vernadsky Inst Geochem & Analyt Chem GEOKhI Moscow 119991 Russia Russian Acad Sci Fiber Opt Res Ctr Moscow 119333 Russia

A set of experiments was carried out in the system NaAlSi3O8-FeO-NiO-coO-Sic-NaH(2)PO(4)at 1550 degrees c, 4 GPa, and oxygen fugacity (fO(2)) 0.5-2.9 log. units below the iron-wustite (IW) buffer to estimate how c-O-H components can affect Ni, co, and P partition between silicate melt and a liquid metallic phase at redox conditions under which the metallic phase is segregated into melting products of the early reduced mantles of the Earth and other planetary bodies. It has been established that the Ni, co, and P partition coefficientsD(\M)(met/sil)between silicate melts saturated with carbon and containing dissolved c-O-H volatiles (mainly in the form of OH groups, H(2)and cH4) at relatively oxidized conditions (fO(2)> IW - 1.5) correspond toD(\M)(met/sil)values expected of metal-silicate melt equilibrium in volatile-free systems at analogousP,T,f(O2), andnbo/tparameters. Under more reduced conditions (fO(2)<= IW - 2), the presence of c-O-H volatiles leads to a decrease inD(\M)(met/sil)for Ni and P compared to that in "dry" melts. This difference increases with decreasingfO(2)and reaches similar to 0.5 and more than one order of magnitude for Ni and P, respectively, atfO(2)= IW - 2.9. The effect of volatiles onD(co)(met/sil)is much weaker, and hence, a decrease infO(2)leads to thatD(Ni)(met/sil)andD(co)(met/sil)converge. The Raman spectra of the experimental glasses and their SIMS analyses for hydrogen show that water content (OH + H2O) in the melts decreases with decreasingfO(2), whereas the contents of cH(4)and complexes with c-H bonds significantly increases. The likely reasons for the decrease inD(\M)(met/sil)under strongly reduced conditions may be changes in the structure of the silicate melts and the origin of complex compounds of siderophile elements with volatiles in these melts.

关键词： experiment oxygen fugacity c Ni co P silicate melt siderophile elements silicate-metal partition

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Modeling the Failure Time and Residual Strength of c/Sic composites under Stress-Oxidation Environment

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TRANSAcTIONS OF THE INDIAN cERAMIc SOcIETY 2020年第4期79卷 212-220页

作者： chen, Peng Niu, Xuming chen, Xihui Sun, Zhigang Zou, Pengjian Song, Yingdong Nanjing Univ Aeronaut & Astronaut Coll Energy & Power Engn Jiangsu Prov Key Lab Aerosp Power Syst Nanjing 210016 Peoples R China Sichuan Aerosp Syst Engn Inst Chengdu 610100 Peoples R China Minist Ind & Informat Technol Key Lab Aeroengine Thermal Environm & Struct Nanjing 210016 Peoples R China Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Mech Struct Nanjing 210016 Peoples R China

Based on the oxidation kinetics of c/Sic composites at 900o-1200oc in stress-oxidation environment, a non-uniform model of oxidation has been suggested in this paper. combined with fiber notch model, curtin's strength model and BHE model, the non-uniform model is able to predict the failure time and residual strength of c/Sic composites accurately. Besides, the initial defects of the model (matrix coating crack and open porosity), the effects of coating were taken into account, and the fiber strength and broken ratio were analyzed. Furthermore, the effects of oxidation time, stress, temperature, Si c coating thickness and volume fraction of fiber on the failure time and residual strength were discussed, and the predicted results showed a good consistency with the experimental data.

关键词： c Si c composites Stress-oxidation Failure time Residual strength Predictive model

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c. elegans ribosomal protein S3 protects against H2O2-induced DNA damage and suppresses spontaneous mutations in yeast

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DNA REPAIR 2022年 117卷 103359页

作者： Elsakrmy, Noha Aouida, Mustapha Hindi, Nagham Moovarkumudalvan, Balasubramanian Mohanty, Ashima Ali, Reem Ramotar, Dindial Hamad Bin Khalifa Univ Qatar Fdn Coll Hlth & Life Sci Div Biol & Biomed Sci POB 34110 Doha Qatar Hamad Bin Khalifa Univ Qatar Fdn Coll Hlth & Life Sci Div Genom & Precis Med POB 34110 Doha Qatar

carcinogenicity and cytotoxicity are severe consequences of DNA damage. Base Excision Repair (BER) is a conserved DNA repair pathway that replaces many damaged bases caused by oxidation. Aberrations in BER are associated with carcinogenesis, neurodegeneration, and aging. The nematode c. elegans is an attractive model system for studying BER. However, in this organism, the complete pathway is not fully delineated. To further explore the BER process in c. elegans, we used affinity tag chromatography and mass spectrometry to identify the interactome of uracil DNA glycosylase-1 (ceUNG-1), an enzyme that acts during the first step of the BER pathway. Our analysis identified that ceUNG-1 is associated with the 40 S ribosomal protein S3 (ceRPS-3), homologs of which have been shown to process 8-oxoguanine and abasic site lesions in other organisms. We report a strong in silico association between ceUNG-1 and ceRPS-3 and confirmed this interaction using the yeast two-hybrid system. Downregulation of the cerps-3 gene reduced the viability of wild-type worms upon exposure to the chemical oxidant hydrogen peroxide. Further analysis shows that cerps-3 knockdown significantly sensitized the AP endonuclease APN-1-deficient strain, apn-1, but to a lesser extent exo-3, to the lethal effects of hydrogen peroxide. A cross-species complementation experiment reveals that the expression of ceRPS-3 rescued the hydrogen peroxide sensitivity, and suppressed the high mutation frequency of the yeast AP endonucleasedeficient strain lacking Apn1 and Apn2. We propose that ceRPS-3 may function as an auxiliary DNA repair enzyme in c. elegans to process oxidative DNA lesions.

关键词： RNAinterference Yeasttwo-hybridsystem APendonuclease c elegansmutants 8-oxoguanine OGG1

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Eggshell-membrane-templated synthesis of c, S Doped Mesoporous NiO for methanol oxidation in alkaline solution

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JOURNAL OF APPLIED ELEcTROcHEMISTRY 2020年第8期50卷 821-834页

作者： Gu, Yingying Yu, Zhenzhen Wu, Siqin Gao, Pengyu Hu, Yifen Zhang, chuan Xu, Zhen Li, Jing An, Yarui Univ Shanghai Sci & Technol Coll Sci Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Ctr Publ Expt Shanghai 200093 Peoples R China

An interwoven hollow fiber structured mesoporous NiO catalyst doped with c, S was fabricated by the vacuum impregnation and thermal decomposition methods using eggshell membrane as template. The structure of the catalyst was characterized by X-ray diffraction, thermo-gravimetric analysis, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and specific surface area test. Under a high vacuum condition, the synthesized NiO material has a better interwoven fiber and mesoporous structure, which effectively increases the specific surface area of the material. c and S were doped into NiO via eggshell membrane pyrolysis, which then formed c-OH and SO42- species on the surface of the material. The electrocatalytic performance of the catalyst for the oxidation of methanol in alkaline solution was studied by cyclic voltammetry and chronoamperometry. The c, S doped mesoporous NiO material exhibits much higher catalytic efficiency and anti-poisoning ability than that of NiO nanoparticles due to the synergistic catalysis of NiO and doping c-OH and SO42- species. Graphic abstract

关键词： Eggshell membrane High vacuum c S doped NiO material

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Ultrasensitive Detection of Hepatitis c Virus DNA Subtypes Based on cucurbituril and Graphene Oxide Nano-composite

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chemical Research in chinese Universities 2020年第2期36卷 307-312页

作者： JIANG Ping LI Yifei JU Ting cHENG Wenbo XU Jianhua HAN Kun University of Science and Technology of China Hefei 230027P.R.China C/LS Key Lab of Bio-medical Diagnostics Suzhou Institute of Biomedical Engineering and TechnologyChinese Academy of SciencesSuzhou 215163P.R.China University of Chinese Academy of Sciences Beijing 100049P.R China Institute of Optics and Electronics Chengdu 610209P.R.China Laboratory of Oncology Science and Molecular Biology Shunde Hospital of Guangzhou University of Chinese MedicineFoshan 528333P.R.China

Infectious of hepatitis c viruses(HcVs)lead to hepatic fibrosis,cirrhosis even *** rapid and sensitive diagnostic method for HcV is of great *** on the host-and-guest interaction between cucurbit[7]uril(cB[7])and methylene blue(MB),a cB[7]-graphene nano-composite(cB[7]-N3-GO)is raised for the electrochemical detection of HcV *** method is able to linearly detect the HcV nucleic acid in the range of 0.2—10 nmol/L with detection limit as low as 160.4 pmol/*** proposed detection strategy is able to discriminate the lb and 6k subtypes of HcV and has a prospective potential in the blood screen for HcV in clinical diagnosis.

关键词： Hepatitis c virus cucurbit[7]uril Graphene Nano-composite Assay

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Effects of preform structures on the mechanical and ablation properties of c/Zrc-Sic composites

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INTERNATIONAL JOURNAL OF APPLIED cERAMIc TEcHNOLOGY 2020年第4期17卷 1582-1600页

作者： Yang, Xiao-Hui Li, Ke-Zhi Bai, Long-teng Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Peoples R China Xian Aerosp Prop Inst Xian Peoples R China

In order to investigate the effects of preform structures on the mechanical and ablation properties of c/Zrc-Sic composites, 3D4X, 3D5X and 3DZc c/Zrc-Sic composites were fabricated with the same process. The mechanical and ablation properties of 3D4X, 3D5X, and 3DZc c/Zrc-Sic composites were investigated. Results showed that the tensile strength (122.26 MPa) and bending strength (233.29 MPa) of 3D5X c/Zrc-Sic composites were the largest, followed by the tensile strength (112.79 MPa) and bending strength (203.03 MPa) of 3DZc composites and the tensile strength (86.22 MPa) and bending strength (137.59 MPa) of 3D4X composites. The mechanical properties of c/Zrc-Sic composites were mainly related to the fiber content in the axis direction and matrix compactness. In terms of ablation properties, 3DZc c/Zrc-Sic composites acted out the worst performance (the linear ablation rates of 0.0293 mm/s and the mass ablation rates 0.00766 g/s), followed by 3D4X composites (the linear ablation rates of 0.0276 mm/s and the mass ablation rates 0.00683 g/s) and 3D5X composites (the linear ablation rates of 0.0175 mm/s and the mass ablation rates 0.00653 g/s), respectively, which were mainly due to the specific ablation angles, thermal conductivities, and ablation oxides contents caused by fiber volume fraction, braided angles, and other forming parameters.

关键词： ablation properties c Zrc-Sic composites mechanical properties perform structures

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Electrochemical Activation of Li2MnO3 Electrodes at 0 °c and Its Impact on the Subsequent Performance at Higher Temperatures

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MATERIALS 2020年第19期13卷 4388页

作者： Susai, Francis Amalraj Talianker, Michael Liu, Jing Rosy Paul, Tanmoy Grinblat, Yehudit Erickson, Evan Noked, Malachi Burstein, Larisa Frenkel, Anatoly I. Tsur, Yoed Markovsky, Boris Aurbach, Doron Bar Ilan Univ Dept Chem IL-52900 Ramat Gan Israel Bar Ilan Univ Inst Nanotechnol & Adv Mat IL-52900 Ramat Gan Israel Ben Gurion Univ Negev Dept Mat Engn IL-84105 Beer Sheva Israel Manhattan Coll Dept Phys New York NY 10471 USA Technion Israel Inst Technol Dept Chem Engn IL-3200003 Haifa Israel Technion Israel Inst Technol Grand Technion Energy Program IL-3200003 Haifa Israel Tel Aviv Univ Wolfson Appl Mat Res Ctr IL-69978 Tel Aviv Israel SUNY Stony Brook Dept Mat Sci & Chem Engn Stony Brook NY 11794 USA

This work continues our systematic study of Li- and Mn- rich cathodes for lithium-ion batteries. We chose Li2MnO3 as a model electrode material with the aim of correlating the improved electrochemical characteristics of these cathodes initially activated at 0 degrees c with the structural evolution of Li2MnO3, oxygen loss, formation of per-oxo like species (O-2(2-)) and the surface chemistry. It was established that performing a few initial charge/discharge (activation) cycles of Li2MnO3 at 0 degrees c resulted in increased discharge capacity and higher capacity retention, and decreased and substantially stabilized the voltage hysteresis upon subsequent cycling at 30 degrees c or at 45 degrees c. In contrast to the activation of Li2MnO3 at these higher temperatures, Li2MnO3 underwent step-by-step activation at 0 degrees c, providing a stepwise traversing of the voltage plateau at >4.5 V during initial cycling. Importantly, these findings agree well with our previous studies on the activation at 0 degrees c of 0.35Li(2)MnO(3)center dot 0.65Li[Mn0.45Ni0.35co0.20]O-2 materials. The stability of the interface developed at 0 degrees c can be ascribed to the reduced interactions of the per-oxo-like species formed and the oxygen released from Li2MnO3 with solvents in ethylene carbonate-methyl-ethyl carbonate/LiPF6 solutions. Our TEM studies revealed that typically, upon initial cycling both at 0 degrees c and 30 degrees c, Li2MnO3 underwent partial structural layered-to-spinel (Li2Mn2O4) transition.

关键词： lithium-ion batteries Li and Mn-rich materials Li2MnO3 activation at 0 ° c stabilized cycling decreased the voltage hysteresis layered-to-spinel transition bulk and surface characteristics

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comparison enteral superoxide dismutase 1 IU and 5 IU from cucumis melo L.c extract combined with gliadin as an antioxidant and anti-inflammatory in LPS-Induced sepsis model rats

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HELIYON 2022年第8期8卷 e10236页

作者： Zainumi, cut Meliza Siregar, Gontar Alamsyah Wijaya, Dadik Wahyu Ichwan, Muhammad Univ Sumatera Utara Fac Med Dept Anesthesiol & Intens Care Medan Indonesia Univ Sumatera Utara Fac Med Dept Internal Med Medan Indonesia Univ Sumatera Utara Fac Med Dept Pharmacol & Therapeut Medan Indonesia

Sepsis is a major cause of death in intensive care units whose development is supported by an imbalance of oxidative stress and antioxidant. Superoxide dismutase (SOD) is a primer endogen antioxidant that prevents reactive oxygen species (ROS). Extensive studies on animals and humans have examined cucumis melo L.c, a cantaloupe rich in SOD, and its combination with gliadin. The studies aimed to determine the effect of enteral administration of cucumis melo L.c. gliadin (cME-gliadin) 28 days before inducing sepsis in rats. This experimental study aimed to compare four groups of male Wistar rats, including negative and positive control rats and those supplemented with SOD cME-gliadin 1 IU/day and SOD cME-gliadin 5 IU/day. All rats were given the same standard, except the supplementation for 28 days. Sepsis was induced by intraperitoneal injection of LPS 10 mg/kg. Enteral admin-istration of SOD - gliadin extract of cME-gliadin for 28 days was used as antioxidant prophylaxis against oxidative stress due to sepsis. The results showed that enteral administration of cME-gliadin of 1 IU/day and 5 IU/day significantly increased SOD levels based on examination after 14 and 28 days. Also, it significantly decreased MDA (p < 0.001), TNF-alpha (p < 0.001), and lactate levels in rats induced by sepsis. However, the increase in lactate levels was above >1.64 mmol/l, indicating a high mortality rate. There was no significant difference in SOD, MDA, TNF-alpha, and Lactate levels between SOD 1 IU and SOD 5 IU. This descriptive data show that SOD 5 IU has a better result in MDA, TNF-alpha, and Lactate levels than SOD 1 IU.

关键词： cucumis melo L c gliadin SOD extract Antioxidant Sepsis model MDA Lactate

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Robust Statistical Detection of GNSS Multipath Using Inter-Frequency c/N0 Differences

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REMOTE SENSING 2020年第20期12卷 3388-3388页

作者： Xia, Yan Pan, Shuguo Meng, Xiaolin Gao, Wang Wen, He Southeast Univ Sch Instrument Sci & Engn Nanjing 210096 Peoples R China Minist Educ Key Lab Microinertial Instrument & Adv Nav Techno Nanjing 210096 Peoples R China Univ Nottingham Nottingham Geospatial Inst Nottingham NG7 2TU England Global Geospatial Engn Ltd UbiPOS UK Ltd Nottingham NG8 1NA England

Multipath detection and mitigation are crucial issues for global navigation satellite system (GNSS) high-precision positioning. The multi-frequency carrier power-to-noise density ratio (c/N-0)-based multipath detection technique has achieved good results in real-time static and low-dynamic applications, and shown better practicability because of the low computational load and the requirement for little additional hardware. However, the classic multipath detection method based on inter-frequency c/N-0 differences directly employs the 3 sigma rule to determine the threshold without considering the distribution of detection statistics and their variation characteristics with elevation angle, and ignores the interference of outliers to the reference functions. A robust multipath detection method is proposed in this paper. The reference functions of c/N-0 differences are fitted using least absolute deviation (LAD) to obtain more accurate nominal values. According to the skew characteristics of the detection statistics, a medcouple (Mc)-based adjusted boxplot is employed to determine the threshold. The performance of the new detection method is verified in the multipath environments. The experimental results show that compared with the classic method, the new multipath detector has strong robustness and can respond more accurately to large changes in multipath (MP) combination values at most elevation angles. It is sensitive to short-delay multipath and diffraction, and is an important supplement to multipath detection techniques.

关键词： multipath detection c N-0 difference least absolute deviation quantile regression adjusted boxplot GNSS and 3D positioning

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The effect of Ru/c and Mgcl2 on the cleavage of inter- and intra-molecular linkages during cornstalk hydrolysis residue valorization

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cELLULOSE 2020年第2期27卷 799-823页

作者： Lv, Wei Liao, Yuhe Zhu, Yuting Liu, Jing Zhu, changhui Wang, chenguang Xu, Ying Zhang, Qi chen, Guanyi Ma, Longlong Chinese Acad Sci Guangzhou Inst Energy Convers CAS Key Lab Renewable Energy Guangdong Prov Key Lab New & Renewable Energy Res 2 Nengyuan Rd Guangzhou 510640 Peoples R China Tianjin Univ Sch Environm Sci & Engn 92 Weijin Rd Tianjin 300000 Peoples R China Katholieke Univ Leuven Ctr Surface Chem & Catalysis Celestijnenlaan 200F B-3001 Heverlee Belgium Key Lab Biomass Energy & Mat 16 5th Suojin Village Nanjing 210018 Jiangsu Peoples R China

The cleavage of linkages of lignocellulose is important for its valorization. The linkage cleavage of cornstalk hydrolysis residue was investigated over catalysts (Ru/c + Mgcl2) in EtOAc/H2O solvents. The results show that almost hydrogen bonds, c-c bonds, ether and ester bonds in the matrix of lignin and cellulose were broken, accompanying 80.6% of lignin and 98.5% of cellulose conversion, and obtaining 37.5% of aromatic monomers and 28.8% of lignin oligomers. In the reaction system, biphasic EtOAc/H2O solvents exhibited an effect on cleaving the intermolecular linkages between lignin and cellulose. Mgcl2 showed limited abilities of breaking the alpha-O-4 and beta-O-4 linkages in lignin and limited beta-1, 4-glycosidic and hydrogen bonds in cellulose were cleaved over Ru/c catalyst. The cleavage of c-O linkages (alpha-O-4, beta-O-4, 4-O-5) and c-c bonds (alpha-beta, beta-5) in lignin were mainly dependent on Ru/c catalyst. Much c-O and the stubborn c-c linkages of beta-5, beta-1 and 5-5 were significantly disrupted by the synergistic effect between Mgcl2 and Ru/c. However, Mgcl2 exhibited great contribution to breakage of beta-1, 4-glycosidic linkage, hydrogen bonds and sugar ring of cellulose. The linkage of beta-1, 4-glycosidic, hydrogen bonds and c-c in c5/c6 sugars were significantly broken. The increased yield of products was evidently due to the synergistic effect of Ru/c combined with Mgcl2.

关键词： cleavage of linkage Biphasic EtOAc H2O solvents Ru c Mgcl2 cornstalk hydrolysis residue (cHR) Valorization

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