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12 results on '"Han, Wensheng"'

3. Phase Equilibria in the System Nb2O5-MgO-SiO2 at 1673 K and 1523 K in Air.

Author

Ran, Mengjie, Ren, Guoxing, Xiao, Songwen, Han, Wensheng, and Chen, Wen

Subjects
PHASE equilibrium, X-ray microanalysis, TERNARY system, X-ray diffraction, NIOBATES
Abstract

Phase relationships of the Nb2O5-MgO-SiO2 system in equilibrium at 1673 K and 1523 K in air have been investigated by the high-temperature equilibration/quenching method. The compositions of equilibrium phase were determined by electron-probe X-ray microanalysis (EPMA) and X-ray diffraction (XRD). In this study, no ternary compounds were observed. The isothermal section of the system at 1673 K was triangulated into seven three-phase regions: SiO2-Nb2O5-Mg2/3Nb34/3O29, SiO2-Mg2/3Nb34/3O29-MgNb2O6, SiO2-MgSiO3-MgNb2O6, MgO-Mg2SiO4-Mg4Nb2O9, Mg2SiO4-MgNb2O6-Mg5Nb4O15, MgSiO3-Mg2SiO4-MgNb2O6, and Mg2SiO4-Mg5Nb4O15-Mg4Nb2O9. Similarly, the isothermal section at 1523 K was triangulated into six three-phase regions: SiO2-Nb2O5-MgNb2O6 region, SiO2-MgSiO3-MgNb2O6 region, MgO-Mg2SiO4-Mg4Nb2O9 region, Mg2SiO4-MgNb2O6-Mg5Nb4O15 region, MgSiO3-Mg2SiO4-MgNb2O6 region, and Mg2SiO4-Mg5Nb4O15-Mg4Nb2O9 region. The determination of the Nb2O5-MgO-SiO2 ternary system further enriches the thermodynamic databases of silicates and niobates. [ABSTRACT FROM AUTHOR]

Published
2023
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6. Recovery of lithium from alkaline brine by solvent extraction with β-diketone

Author

Shi Dong, Han Wensheng, Peng Xiaowu, Feng Nie, Zhang Licheng, Song Fugen, and Lijuan Li

Subjects
Kerosene, Chromatography, McCabe–Thiele method, Chemistry, Metals and Alloys, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Diluent, Industrial and Manufacturing Engineering, 0104 chemical sciences, β diketone, Brine, Materials Chemistry, 0210 nano-technology, Solvent extraction, Impurity ions, Data scrubbing, Nuclear chemistry
Abstract

Lithium recovery from alkaline brines by counter-current method using β-diketone was investigated. By comparing effect of different co-extractants and diluents on lithium extraction, HBTA-TOPO-kerosene system was determined as the extraction system. In extraction process, 0.4 mol/L HBTA and 0.3 mol/L TOPO in kerosene performed as extractant and three theoretical stages were required to reach 95% extraction according to McCabe Thiele diagram. 1 mol/L HCl and 3 mol/L HCl solution were used as scrubbing agent and stripping agent respectively. In regeneration stage, 2 mol/L NaOH was used as regeneration agent to remove free acid entrained in organic phase and exchange H+ of hydroxyl. Bench experiments indicated that the respective number of extraction, scrubbing, stripping and regeneration were 3, 1, 2 and 1 stage. A 7-stage extraction process was conducted in a mixer-settler for 30 h to reach stable state, average extraction rate of lithium was 96% and lithium concentration in stripping solution was 15 g/L. Concentration of impurity ions in stripping liquor was

Published
2018

12. Long noncoding RNA MAGI2-AS3 regulates the H 2 O 2 level and cell senescence via HSPA8.

Author

Zhang Y, Qiao X, Liu L, Han W, Liu Q, Wang Y, Xie T, Tang Y, Wang T, Meng J, Ye A, He S, Chen R, and Chen C

Subjects
Cell Line, Tumor, Cell Proliferation genetics, Cellular Senescence, Gene Expression Regulation, Neoplastic, Humans, Hydrogen Peroxide metabolism, HSC70 Heat-Shock Proteins metabolism, MicroRNAs genetics, RNA, Long Noncoding genetics
Abstract

The redox homeostasis system regulates many biological processes, intracellular antioxidant production and redox signaling. However, long noncoding RNAs (lncRNAs) involved in redox regulation have rarely been reported. Herein, we reported that downregulation of MAGI2-AS3 decreased the superoxide level in Human fibroblasts (Fbs), a replicative aging model, as detected by the fluorescent probes dihydroethidium (DHE) and MitoSOX™ Red. RNA pulldown combined with mass spectrometry showed that HSPA8 is a novel interacting protein of MAGI2-AS3, which was further confirmed by photoactivatable ribonucleoside-enhanced crosslinking and immunoprecipitation (PAR-CLIP). Downregulation of MAGI2-AS3 decreased the hydrogen peroxide (H 2 O 2 ) content by stabilizing the HSPA8 protein level via inhibiting the protesome degradation of HSPA8. Further evidence showed that MAGI2-AS3 interacted with the C-terminal domain (CTD) of HSPA8. Downregulation of MAGI2-AS3 delayed cell senescence, while this antiaging effect was abolished by HSPA8 knockdown. The underlying molecular mechanism by which MAGI2-AS3 knockdown inhibited cell senescence was mediated via suppression of the ROS/MAP2K6/p38 signaling pathway. Taken together, these findings revealed that downregulation of lncRNA MAGI2-AS3 decreased the H 2 O 2 content and delayed cell senescence by stabilizing the HSPA8 protein level, identifying a potential antiaging application., (Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.)

Published
2022
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