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Xing L, Chen Z, Zhan G, Huang Z, Li M, Li Y, Wang L, Li J. Sulfur Migration Enhanced Proton-Coupled Electron Transfer for Efficient CO 2 Desorption with Core-Shelled C@Mn 3O 4. Environ Sci Technol 2024; 58:4606-4616. [PMID: 38427797 DOI: 10.1021/acs.est.3c09875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/03/2024]
Abstract
Transforming hazardous species into active sites by ingenious material design was a promising and positive strategy to improve catalytic reactions in industrial applications. To synergistically address the issue of sluggish CO2 desorption kinetics and SO2-poisoning solvent of amine scrubbing, we propose a novel method for preparing a high-performance core-shell C@Mn3O4 catalyst for heterogeneous sulfur migration and in situ reconstruction to active -SO3H groups, and thus inducing an enhanced proton-coupled electron transfer (PCET) effect for CO2 desorption. As anticipated, the rate of CO2 desorption increases significantly, by 255%, when SO2 is introduced. On a bench scale, dynamic CO2 capture experiments reveal that the catalytic regeneration heat duty of SO2-poisoned solvent experiences a 32% reduction compared to the blank case, while the durability of the catalyst is confirmed. Thus, the enhanced PCET of C@Mn3O4, facilitated by sulfur migration and simultaneous transformation, effectively improves the SO2 resistance and regeneration efficiency of amine solvents, providing a novel route for pursuing cost-effective CO2 capture with an amine solvent.
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Affiliation(s)
- Lei Xing
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Zhen Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Guoxiong Zhan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Zhoulan Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Mingyue Li
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Yuchen Li
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Lidong Wang
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
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Zhang Y, Zhan G, Huang Z, Xing L, Ying Y, Chen Z, Li J. Performance and mechanisms of alkaline solid waste in CO 2 mineralization and utilization. Waste Manag 2024; 175:62-72. [PMID: 38171077 DOI: 10.1016/j.wasman.2023.12.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 12/15/2023] [Accepted: 12/24/2023] [Indexed: 01/05/2024]
Abstract
CO2 mineral sequestration using alkaline solid waste (ASW) is a promising strategy for synergistically reducing CO2 emissions and reusing industrial waste. However, improvement the carbonation degree still remains challenges due to the sluggish leaching rate of Ca/Mg ion at low pH. To the issues, this study proposed an amine-mediated CO2 absorption and mineralization process with six common ASWs, as well an ecological utilization route of CO2-ASW productions. Experimental results indicated that calcium carbide slag (CS) had greater CO2 mineralization capacity (86.2 g-CO2/kg-CS) than other ASWs, while stirring rate and particle size played a more important role during CO2 capture. Amine-mediated CO2 capture was verified to be more excellent with steel slag (SS) as mineral medium. When the MEA concentration was increased to 2 mol/L, the extraction efficiency of Ca2+ was increased by 35 %, leaded to the CO2 removal efficiency significantly promoted from 49 % to 92 %. The characterization of structural morphology referred spherical aragonite or needle-bar calcite was dominant for the porous mineralization products (30.6 m2/g). High germination index of pea seed (112.1 % at a dose of 10 g/L) inferred the negligible toxicological effects of tiny MEA residue over SS mineralization products, after centrifugally washing treatment. Pea seeds cultivated with mineralized products after centrifugal washing can achieve a growth rate of about 4 mm/d. Overall, this work provides a feasible route to apply the porous CO2-ASWs production into water conservation in arid and sandy land.
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Affiliation(s)
- Yongpeng Zhang
- School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, ZhengZhou 450046, PR China
| | - Guoxiong Zhan
- National Engineering Research Center for Synergistic Control of Air Pollutants and Greenhouse Gases, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Zhoulan Huang
- National Engineering Research Center for Synergistic Control of Air Pollutants and Greenhouse Gases, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Lei Xing
- National Engineering Research Center for Synergistic Control of Air Pollutants and Greenhouse Gases, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Yimei Ying
- School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, ZhengZhou 450046, PR China
| | - Zhen Chen
- National Engineering Research Center for Synergistic Control of Air Pollutants and Greenhouse Gases, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
| | - Junhua Li
- National Engineering Research Center for Synergistic Control of Air Pollutants and Greenhouse Gases, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
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Zhan G, Cao F, Chen J, Chen Z, Duan Y, Chang F, Zeng S, Bai Y, Li Z, Zhang X, Li J. Comprehensive evaluation of an ionic liquid based deep purification process for NH 3-containing industrial gas. J Environ Sci (China) 2024; 136:698-708. [PMID: 37923478 DOI: 10.1016/j.jes.2022.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 12/07/2022] [Accepted: 12/12/2022] [Indexed: 11/07/2023]
Abstract
Ammonia (NH3) emission has caused serious environment issues and aroused worldwide concern. The emerging ionic liquid (IL) provides a greener way to efficiently capture NH3. This paper provides rigorous process simulation, optimization and assessment for a novel NH3 deep purification process using IL. The process was designed and investigated by simulation and optimization using ionic liquid [C4im][NTF2] as absorbent. Three objective functions, total purification cost (TPC), total process CO2 emission (TPCOE) and thermal efficiency (ηeff) were employed to optimize the absorption process. Process simulation and optimization results indicate that at same purification standard and recovery rate, the novel process can achieve lower cost and CO2 emission compared to benchmark process. After process optimization, the optimal functions can achieve 0.02726 $/Nm3 (TPC), 311.27 kg CO2/hr (TPCOE), and 52.21% (ηeff) for enhanced process. Moreover, compared with conventional process, novel process could decrease over $ 3 million of purification cost and 10000 tons of CO2 emission during the life cycle. The results provide a novel strategy and guidance for deep purification of NH3 capture.
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Affiliation(s)
- Guoxiong Zhan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Fei Cao
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Zhen Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yuanmeng Duan
- Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Fei Chang
- Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Shaojuan Zeng
- Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yinge Bai
- Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zengxi Li
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China; College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Xiangping Zhang
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China; Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
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Li Y, Chen Z, Yuan B, Xing L, Zhan G, Peng Y, Wang L, Li J. Synergistic promotion for CO2 absorption and solvent regeneration by fine waste red mud particles on in amine-based carbon capture: Performance and mechanism. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Li Y, Chen Z, Zhan G, Yuan B, Wang L, Li J. Inducing efficient proton transfer through Fe/Ni@COF to promote amine-based solvent regeneration for achieving low-cost capture of CO2 from industrial flue gas. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121676] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Chen Z, Yuan B, Zhan G, Li Y, Li J, Chen J, Peng Y, Wang L, You C, Li J. Energy-Efficient Biphasic Solvents for Industrial Carbon Capture: Role of Physical Solvents on CO 2 Absorption and Phase Splitting. Environ Sci Technol 2022; 56:13305-13313. [PMID: 36094167 DOI: 10.1021/acs.est.2c05687] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Physical solvent is a promising alternative for the phase splitting of solvent to drastically reduce the regeneration energy during CO2 capture. Here, an aqueous biphasic solvent, optimally composed of 30 wt % polyamine (N, N-dimethylpropylamine, DMPA) and 50 wt % physical solvent (polyethyleneglycol dimethyl ether, NHD), is prepared, which presents high cyclic loading, low regeneration energy, and good stability. L16(45) orthogonal tests are performed to comprehensively evaluate the mass-transfer kinetics and the effect of crucial conditions, verifying the weak effect of NHD solvent on mass transfer. The solvent effect of NHD could decrease the energy barrier of carbamate generation from zwitterions (DMPA+COO-) to enhance chemical absorption. The low polarity of the NHD solvent provides source motivation and accelerates phase splitting. Time-space resolution distribution of CO2 capacity is established based on a scale-up separator with 5 L solvent, which supports multiscale force analysis for the various stages during phase splitting. The drag force of the homogeneous cluster was first introduced into separation dynamics, referred to as an important reason for the various splitting behaviors of a scale-up separator.
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Affiliation(s)
- Zhen Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing100084, P.R. China
- Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing100084, P.R. China
| | - Bingling Yuan
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing102206, P.R. China
| | - Guoxiong Zhan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing100084, P.R. China
| | - Yuchen Li
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing102206, P.R. China
| | - Jinyang Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing100084, P.R. China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing100084, P.R. China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing100084, P.R. China
| | - Lidong Wang
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing102206, P.R. China
| | - Changfu You
- Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing100084, P.R. China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing100084, P.R. China
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Cao Y, Tan X, Zhan G, Li Q, Wang H, Li Z. Novel process for selective separation of trace artemisitene from artemisinin by ammonium functional ionic liquids. AIChE J 2022. [DOI: 10.1002/aic.17711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yingying Cao
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences Beijing P.R. China
- College of Chemical Engineering University of Chinese Academy of Sciences Beijing P.R. China
| | - Xin Tan
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences Beijing P.R. China
- College of Chemical Engineering University of Chinese Academy of Sciences Beijing P.R. China
| | - Guoxiong Zhan
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences Beijing P.R. China
- College of Chemical Engineering University of Chinese Academy of Sciences Beijing P.R. China
| | - Qiongguang Li
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences Beijing P.R. China
- College of Chemical Engineering University of Chinese Academy of Sciences Beijing P.R. China
| | - Hui Wang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences Beijing P.R. China
- College of Chemical Engineering University of Chinese Academy of Sciences Beijing P.R. China
| | - Zengxi Li
- College of Chemical Engineering University of Chinese Academy of Sciences Beijing P.R. China
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Hussain S, Dong H, Zhang Y, Zhan G, Zeng S, Duan H, Zhang X. Impregnation of 1- n-Butyl-3-methylimidazolium Dicyanide [BMIM][DCA] into ZIF-8 as a Versatile Sorbent for Efficient and Selective Separation of CO 2. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c03798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shahid Hussain
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Haifeng Dong
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- Huizhou Institute of Green Energy and Advanced Materials, Huizhou, Guangdong 516081, China
| | - Yanqiang Zhang
- Key Laboratory of Science and Technology on Particle Materials, Chinese Academy of Sciences, Beijing 100190, China
| | - Guoxiong Zhan
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Shaojuan Zeng
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Huifang Duan
- Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, Guangdong 516003, China
| | - Xiangping Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, Guangdong 516003, China
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Wu Z, Shi S, Zhan G, Chang F, Bai Y, Zhang X, C. S. Wu J, Zeng S. Ionic liquid screening for dichloromethane absorption by multi-scale simulations. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119187] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- Fei Chang
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Xiangping Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Guoxiong Zhan
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yuanmeng Duan
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Suojiang Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
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Zhan G, Bai L, Zeng S, Bai Y, Su H, Wu B, Cao F, Shang D, Li Z, Zhang X, Zhang S. Dynamic Process Simulation and Assessment of CO 2 Removal from Confined Spaces Using Pressure Swing Adsorption. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c02255] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guoxiong Zhan
- Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lu Bai
- Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100049, China
| | - Shaojuan Zeng
- Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yinge Bai
- Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Hang Su
- Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- College of Mathematics and Physics, Bohai University, Jinzhou, Liaoning 121013, China
| | - Bin Wu
- College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Fei Cao
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dawei Shang
- Sinopec Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China
| | - Zengxi Li
- College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiangping Zhang
- Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Suojiang Zhang
- Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Zhan G, Makoudi Y, Jeannoutot J, Féron M, Palmino F, Chérioux F. Controlled growth of a bicomponent supramolecular network by the sergeants & soldiers principle. Chem Commun (Camb) 2018; 54:9171-9173. [PMID: 30062353 DOI: 10.1039/c8cc04226h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The co-deposition of 1,4-di(4',4''-pyridyl)benzene and 1,4-di(4',4''-bromophenyl)benzene on Si(111)-B surface leads to the formation of a highly regular self-assembly. The formation of this network has been investigated by STM and has been elucidated in the light of sergeants & soldiers principle due to halogen bonding on a silicon surface.
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Affiliation(s)
- G Zhan
- Institut FEMTO-ST, Univ. Bourgogne Franche-Comté, CNRS, 15B Avenue des Montboucons, F-25030 Besancon, France.
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VEASEY S, Zhan G, Fenik P, Zhu Y. 0298 Advancement of Tau-Mediated Neurodegeneration by Chronic Sleep Disruption. Sleep 2018. [DOI: 10.1093/sleep/zsy061.297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S VEASEY
- Center for Sleep & Respiratory Neurobiology, PHILADELPHIA, PA
| | - G Zhan
- Center for Sleep & Respiratory Neurobiology, PHILADELPHIA, PA
| | - P Fenik
- Center for Sleep & Respiratory Neurobiology, PHILADELPHIA, PA
| | - Y Zhu
- Center for Sleep & Respiratory Neurobiology, PHILADELPHIA, PA
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Dubois MA, Guillermet O, Gauthier S, Zhan G, Makoudi Y, Palmino F, Bouju X, Rochefort A. Influence of Cu adatoms on the molecular assembly of 4,4′-bipyridine on Cu(111). Phys Chem Chem Phys 2018; 20:15350-15357. [DOI: 10.1039/c8cp01184b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of highly organized structures based on two ligands with pyridyl functionalities, 4,4′-bipyridine (BPY) and 1,4-di(4,4′′-pyridyl) benzene (BPYB), and Cu adatoms on the Cu(111) surface has been studied with low temperature and variable temperature scanning tunneling microscopy (STM) and first-principles calculations.
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Affiliation(s)
- M.-A. Dubois
- Département de génie physique et Regroupement québécois sur les matériaux de pointe (RQMP), Polytechnique Montréal
- Montréal
- Canada
| | - O. Guillermet
- Centre d’élaboration de matériaux et d’études structurales
- CEMES-CNRS
- UPR 8011
- Université de Toulouse
- F-31055 Toulouse
| | - S. Gauthier
- Centre d’élaboration de matériaux et d’études structurales
- CEMES-CNRS
- UPR 8011
- Université de Toulouse
- F-31055 Toulouse
| | - G. Zhan
- Institut FEMTO-ST
- Université Bourgogne Franche-Comté
- CNRS
- F-25030 Besançon Cedex
- France
| | - Y. Makoudi
- Institut FEMTO-ST
- Université Bourgogne Franche-Comté
- CNRS
- F-25030 Besançon Cedex
- France
| | - F. Palmino
- Institut FEMTO-ST
- Université Bourgogne Franche-Comté
- CNRS
- F-25030 Besançon Cedex
- France
| | - X. Bouju
- Centre d’élaboration de matériaux et d’études structurales
- CEMES-CNRS
- UPR 8011
- Université de Toulouse
- F-31055 Toulouse
| | - A. Rochefort
- Département de génie physique et Regroupement québécois sur les matériaux de pointe (RQMP), Polytechnique Montréal
- Montréal
- Canada
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Zhao Z, Zhu Y, Zhao X, Zhan G, Fenik P, Veasey S. 0272 CHRONIC SHORT SLEEP INITIATES AN AMYLOID CASCADE IN LOCUS COERULEUS NEURONS AND TAU-DEPENDENT NEURODEGENERATION. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ju HQ, Zhan G, Huang A, Sun Y, Wen S, Yang J, Lu WH, Xu RH, Li J, Li Y, Garcia-Manero G, Huang P, Hu Y. ITD mutation in FLT3 tyrosine kinase promotes Warburg effect and renders therapeutic sensitivity to glycolytic inhibition. Leukemia 2017; 31:2143-2150. [PMID: 28194038 PMCID: PMC5629368 DOI: 10.1038/leu.2017.45] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 10/17/2016] [Accepted: 01/13/2017] [Indexed: 12/17/2022]
Abstract
Internal tandem duplication (ITD) mutation in Fms-like tyrosine kinase 3 gene (FLT3/ITD) represents an unfavorable genetic change in acute myeloid leukemia (AML) and is associated with poor prognosis. Metabolic alterations have been involved in tumor progression and attracted interest as a target for therapeutic intervention. However, few studies analyzed the adaptations of cellular metabolism in the context of FLT3/ITD mutation. Here, we report that FLT3/ITD causes a significant increase in aerobic glycolysis through AKT-mediated upregulation of mitochondrial hexokinase (HK2), and renders the leukemia cells highly dependent on glycolysis and sensitive to pharmacological inhibition of glycolytic activity. Inhibition of glycolysis preferentially causes severe ATP depletion and massive cell death in FLT3/ITD leukemia cells. Glycolytic inhibitors significantly enhances the cytotoxicity induced by FLT3 tyrosine kinase inhibitor sorafenib. Importantly, such combination provides substantial therapeutic benefit in a murine model bearing FLT3/ITD leukemia. Our study suggests that FLT3/ITD mutation promotes Warburg effect, and such metabolic alteration can be exploited to develop effective therapeutic strategy for treatment of AML with FLT3/ITD mutation via metabolic intervention.
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Affiliation(s)
- H-Q Ju
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - G Zhan
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - A Huang
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - Y Sun
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - S Wen
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - J Yang
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - W-H Lu
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - R-H Xu
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
| | - J Li
- Department of Hematology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Y Li
- Department of Hematology, The Second Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - G Garcia-Manero
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - P Huang
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China.,Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Y Hu
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong, China
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He Q, Li F, Li J, Li R, Zhan G, Li G, Du W, Tan H. MicroRNA-26a-interleukin (IL)-6-IL-17 axis regulates the development of non-alcoholic fatty liver disease in a murine model. Clin Exp Immunol 2016; 187:174-184. [PMID: 27377869 DOI: 10.1111/cei.12838] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2016] [Indexed: 02/06/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a hepatic presentation of obesity and metabolic syndrome. MicroRNA 26a (Mir-26a) has been reported to play functions in cellular differentiation, cell growth, cell apoptosis and metastasis. A recent paper indicated that Mir-26a regulated insulin sensitivity and metabolism of glucose and lipids. However, the role of Mir-26a in NAFLD still needs to be investigated further. In our current study, vectors encoding pre-Mir-26a (LV-26a) and an empty lentiviral vector (LV-Con) delivered approximately 2 × 107 transforming units of recombinant lentivirus were injected into mice through the tail vein. LV-26a-infected mice were protected from glucose dysmetabolism and showed markedly decreased total liver weight, hepatic triglyceride deposition and serum alanine transaminase (ALT) concentration when compared with LV-Con-treated mice. LV-26a-treated mice also exhibited decreased infiltration of immune cells in the liver - something attributed to reduce infiltration of T cell receptor (TCR)-γδ+ , granulocyte-differentiation antigen-1 (Gr-1)+ cells and CD11b+ cells. Next, we found that Mir-26a inhibited the expression of interleukin (IL)-17 and IL-6 in vivo and in vitro. Furthermore, the decreased expression of IL-17 in the liver tissue induced by Mir-26a was abrogated completely by IL-6 overexpression. The decreased total liver weight, hepatic triglyceride deposition and serum ALT concentration induced by Mir-26a was also abrogated completely by IL-6 over-expression. In conclusion, the Mir-26a-IL-6-IL-17 axis regulates the development of NAFLD in a murine model.
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Affiliation(s)
- Q He
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
| | - F Li
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
| | - J Li
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
| | - R Li
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
| | - G Zhan
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
| | - G Li
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
| | - W Du
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
| | - H Tan
- Department of Infectious Disease, and Laboratory of Liver Disease, Renmin Hospital, Hubei University of Medicine, China
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Zhan G, Yue-Jin Y, Bo X, Ji-Lin C, Shu-Bin Q, Yong-Jian W, Xue-wen Q, Min Y, Hai-bo L, Jin-Qing Y, Jue C, Shi-Jie Y, Jun D, Jian-Jun L, Run-Lin G. e0496 Comparative study of impaired with normal left ventricle function patients with triple coronary artery disease. Heart 2010. [DOI: 10.1136/hrt.2010.208967.496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Barak AV, Wang Y, Zhan G, Wu Y, Xu L, Huang Q. Sulfuryl fluoride as a quarantine treatment for Anoplophora glabripennis (Coleoptera: Cerambycidae) in regulated wood packing material. J Econ Entomol 2006; 99:1628-35. [PMID: 17066792 DOI: 10.1603/0022-0493-99.5.1628] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The Asian longhorned beetle, Anoplophora glabripennis (Motschulsky) (Coleoptera: Cerambycidae), was probably introduced into the United States from China with solid wood packing and dunnage during the 1980s, and it has recently become established in limited infestations near several major cities in the United States. Regulated wood packing material (RWPM) arriving in the United States from China is required to undergo fumigation with methyl bromide (MeBr), to be heat treated, or kiln dried. Sulfuryl fluoride (SF) is a candidate fumigant to replace MeBr under certain conditions. SF fumigations were conducted in 432-liter Lexan chambers held in a 6.1-m (20-foot) refrigerated container for temperature control. Each fumigation consisted of 12 Populus spp. 10- by 10- by 115-cm timbers, of high moisture content, naturally infested with Asian longhorned beetle. During 2001, we fumigated wood for 24 h at a range of doses (20-112 g/m3) and temperatures (4.4, 10.0, 15.6, and 21.1 degrees C) and subjected the data to probit analysis. Confirmatory fumigations were conducted at doses of 120 and 104 g/m3 at temperatures of 10.0 and 15.6 or 21.1 degrees C, respectively, which resulted in complete kill of all larvae. Pupae that became available later in the year as temperatures warmed were fumigated at 15.6 and 21.1 degrees C with 104 g/m3, which resulted in complete pupal mortality. The next year (2002), we conducted 24-h fumigations with doses of 116 g/m3 at 4.4 and 10.0 degrees C with cold-harvested wood infested with cold-acclimated larvae. Cold-acclimated larvae required much higher concentration times time (CxT) product for control at 4.4 and 10.0 degrees C compared with nonacclimated larvae. Sulfuryl fluoride treatments at a dose of 104 g/m3 and temperature of 15.6 degrees C and above and that achieved a CxT product of 1,095 g-h/m3 or above are recommended for RWPM infested with Asian longhorned beetle larvae and pupae.
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Affiliation(s)
- A V Barak
- USDA-APHIS-PPQ, Pest Survey, Detection and Exclusion Laboratory, Bldg. 1398, Otis ANGB, MA 02542-5008, USA.
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Barak AV, Wang Y, Xu L, Rong Z, Hang X, Zhan G. Methyl bromide as a quarantine treatment for Anoplophora glabripennis (Coleoptera: Cerambycidae) in regulated wood packing material. J Econ Entomol 2005; 98:1911-6. [PMID: 16539113 DOI: 10.1603/0022-0493-98.6.1911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Anoplophora glabripennis (Motschulsky), has recently (since 1996) established in limited infestations near several cities in the United States. A. glabripennis was probably introduced into the United States with solid wood packing or dunnage. During 2001, we evaluated the current APHIS Schedule T404-b-1-1 for methyl bromide (MeBr) fumigation. Fumigations were conducted in 432-liter Lexan chambers inside a 6.1-m refrigerated container. Each fumigation consisted of 12 high-moisture, naturally infested Populus spp. timbers. We fumigated wood for 24 h at 4.4 degrees C (80 g/m3), 10.0 degrees C (64 g/m3), 15.6 degrees C (56 g/m3), and 21.1 degrees C (48 g/m3). All schedule doses resulted in 100% kill of A. glabripennis larvae. During 2002, we conducted additional fumigations to determine the basic toxicity of MeBr to A. glabripennis larvae in solid wood timbers of 10 by 10 by 115-cm size. Probit analysis estimated the CxT product at 99.0, 99.9, 99.99, and 99.99683% kill (probit-9). The probit-9 values for CxT were 1,196.1, 918.7, 642.4, and 362.4 g-h/m3 at 4.4, 10.0, 15.6, and 21.1 degrees C, respectively. Applied doses to achieve this level of control were estimated to be 119.6, 82.7, 56.0, and 32.2 g/m3, respectively. These applied doses are satisfactory for wood as a commodity with wood load factors of approximately 25% and may be higher than necessary for container fumigation where sorptive wood load as crating or pallets may only be 5% or less. The APHIS Schedule T404-b-1-1 is adequate if extended for 24 h and should be amended to include intermediate doses at 10.0 and 15.6 degrees C, thus reducing the use of MeBr at these temperatures.
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Affiliation(s)
- A V Barak
- USDA-APHIS-PPQ, Pest Survey, Detection, and Exclusion Laboratory, Bldg. 1398, Otis ANGB, MA 02542-5008, USA
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Zhan G, Shaheen F, Mackiewicz M, Fenik P, Veasey SC. Single cell laser dissection with molecular beacon polymerase chain reaction identifies 2A as the predominant serotonin receptor subtype in hypoglossal motoneurons. Neuroscience 2002; 113:145-54. [PMID: 12123693 DOI: 10.1016/s0306-4522(02)00137-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We hypothesize that sleep state-dependent withdrawal of serotonin (5-hydroxytryptamine, 5-HT) at upper airway (UAW) dilator motoneurons contributes significantly to sleep-related suppression of dilator muscle activity in obstructive sleep apnea. Identification of 5-HT receptor subtypes involved in postsynaptic facilitation of UAW motoneuron activity may provide pharmacotherapies for this prevalent disorder. We have adapted two assays to provide semi-quantitative measurements of mRNA copy numbers for 5-HT receptor subtypes in single UAW motoneurons. Specifically, soma of 111 hypoglossal (XII) motoneurons in 10 adult male rats were captured using a laser dissection microscope, and then used individually in single round molecular beacon polymerase chain reaction (PCR) for real-time quantitation of 5-HT(2A), 5-HT(2C), 5-HT(3), 5-HT(4), 5-HT(5A), 5-HT(5B), 5-HT(6) or 5-HT(7) receptor. Receptor mRNA copy numbers from single XII motoneurons were compared to control samples from within the XII nucleus and lateral medulla. All 20 motoneuronal soma assayed for the 5-HT(2A) receptor had measurable copy numbers (7028+/-2656 copies/cell). In contrast, copy numbers for the 5-HT(2A) receptor in XII non-motoneuronal (n=17) and lateral medulla (n=15) samples were 81+/-51 copies and 83+/-35 copies, respectively, P<0.05. Seven of 13 XII motoneurons assayed had measurable 5-HT(2C) receptor copy numbers of mRNA (287+/-112 copies/cell). XII soma had minimal 5-HT(3), 5-HT(4), 5-HT(5A), 5-HT(5B), 5-HT(6) or 5-HT(7) receptor mRNA. 5-HT(2A) receptor mRNA presence within XII motoneurons was confirmed with digoxigenin-labeled in situ hybridization. In summary, combined use of laser dissection and molecular beacon PCR revealed 5-HT(2A) receptor as the predominant 5-HT receptor mRNA in XII motoneurons, and identified small quantities of 5-HT(2C) receptor. This information will allow a more complete understanding of serotonergic control of respiratory activity.
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Affiliation(s)
- G Zhan
- Center for Sleep and Respiratory Neurobiology, 972 Maloney Building, 3600 Spruce Street, Philadelphia, PA 19104, USA
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22
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Liang G, Zhan G, Zeng L. [Controlling effect of parasitoids on population of vegetable leaf miner Liriomyza sativae Blanchard]. Ying Yong Sheng Tai Xue Bao 2001; 12:257-60. [PMID: 11757375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The controlling effect of parasitoids on vegetable leaf miner, Liriomyza sativae Blanchard, was evaluated by using acting factor life tables and exclusion inex of population control(EPIC). The results showed that Chrysocharis pentheus, Neuchrysocharis formosa, Chrysonotomyia okazakii, Hemiptarsenus varicornis, Chrysocharis sp., Opius dimidiatus and Opius dissitus played an important role in controlling the population of vegetable leaf miner. The EIPCs of parasitoids were 1.23, 2.73, 5.98, 5.92 and 5.71, respectively for the five generations of L. sativae on kidney bean planted in spring, from the 1st to the 5th generation and, for the 2nd generation in particular, they were 2.73, 2.87, 2.24 and 1.89, respectively on kidney bean, cowpea, luffa and cucumber, indicating that if the parasitoids were excluded, the population of the next generation of L. sativae would increase by times accordingly. The EIPC of parasitoids for the 3rd instar larvae was usually the largest among different instar larvae and pupae, and the EIPCs for the 3rd to 5th generation of L. sativae on spring kidney bean were higher than those for the 1st and the 2nd. The EIPCs of parasitoids for L. sativae on kidney bean and cowpea were larger than those on luffa and cucumber.
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Affiliation(s)
- G Liang
- Key Laboratory of Insect Ecology and Toxicology of Chinese Ministry of Agriculture, South China Agricultural University, Guangzhou 510642.
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Abstract
The purpose of this study was to investigate, in cats, the effects of topical epinephrine on aqueous humor dynamics as measured by the non-invasive method of fluorophotometry and by other methods. Measurements were carried out on 12 cats before and after one week of twice daily treatment with 2% epinephrine hydrochloride to one eye. Aqueous flow and outflow facility were determined using fluorophotometry. Uveoscleral outflow was calculated from these results and was evaluated with anterior chamber perfusion of FITC-dextran. Outflow facility also was measured by tonography. Epinephrine-treated eyes, compared with their baseline values, showed a 31% reduction in intraocular pressure (P<0.001), a 23% reduction in aqueous flow (P<0.05), a 60% increase in fluorophotometric outflow facility (P<0.05), and a 43% increase in tonographic outflow facility (P<0.05). Treated eyes, compared with contralateral control eyes, showed a 27% reduction in IOP (P<0.005), a 25% reduction in aqueous flow (P<0.005), a 38% increase in fluorophotometric outflow facility (P<0.05), and a 34% increase in tonographic outflow facility. When evaluated by both fluorophotometry and FITC-dextran tracer methods, epinephrine had no significant effect on uveoscleral outflow. It was concluded that, in cats treated with topical epinephrine twice daily for a week, a reduction in intraocular pressure is induced by an increase in outflow facility and decrease in aqueous flow.
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Affiliation(s)
- Y L Wang
- The Department of Ophthalmology, University of Nebraska Medical Center, Omaha, Nebraska 68198-5540, USA
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Hanif RM, Qineng P, Zhan G. Penetration enhancing effect of tetrahydrogeraniol on the percutaneous absorption of 5-fluorouracil from gels in excised rat skin. J Control Release 1998; 55:297-302. [PMID: 9795085 DOI: 10.1016/s0168-3659(98)00062-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Poly(acrylic acid) gels containing 5-fluorouracil (5-FU) and tetrahydrogeraniol (THG) were prepared and the effects of THG on 5-FU permeation across the excised rat skin were studied by in vitro methods. Experiments on in vitro permeation of 5-FU across the skin with vertical diffusion cells showed that addition of THG to the gels markedly enhanced the 5-FU permeability. Increasing the THG concentration in the gels to 8% proportionally increased the permeability of 5-FU. More than 12 h was required to reach a steady-state level of 5-FU after administration of 5-FU-THG gel topically. The permeability parameters such as flux, permeability coefficient and enhancement ratio were determined. The results indicated a maximum flux of 252.91+/-9.61 microgram/cm2 per h, and the enhancement ratio of 31.22+/-1.18 when the THG concentration was 8%. Synergistic effects of propylene glycol (PG) with THG were also investigated and a maximum flux of 256.81+/-9.15 microgram/cm2 per h, was obtained when the PG concentration was 5% and THG was 8%. The corresponding enhancement ratio was 31.71+/-1.13. These results suggest not only that THG would be very useful for increasing the skin permeability of 5-FU, but also that THG being a natural product might be useful for developing transdermal therapeutic systems for the delivery of practically unabsorbable drugs.
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Affiliation(s)
- R M Hanif
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing 210009, China
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Saha SL, Zhan G, Tang L, Opere C, Roche EB, Camras CB, Ohia SE, Roche VF. Bicyclic derivatives of hexahydroaporphine: novel agents that lower intraocular pressure. J Ocul Pharmacol Ther 1997; 13:497-505. [PMID: 9436153 DOI: 10.1089/jop.1997.13.497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
We have synthesized a number of novel bicyclic hexahydroaporphines containing a phenethylamine moiety for preliminary study as intraocular pressure lowering agents. The target molecules were synthesized in a twelve step process. The final products were secondary or tertiary amines containing either an aromatic methoxy or phenolic substituent. These molecules, in hydrochloride salt form, were assayed in doses ranging from 0.1-1.5%. All products and vehicle were administered topically to one eye of normotensive rabbits and intraocular pressure was measured in both eyes for up to six hours. Four of the five compounds examined produced a significant and, in some cases, prolonged, ocular hypotensive response. Secondary and N-methylated tertiary amines were equally effective, as were compounds containing either the 10-methoxy group of free phenol. Studies are currently in progress to optimize potency and identify functional and molecular mechanisms of action.
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Affiliation(s)
- S L Saha
- Creighton University Health Sciences Center, Omaha, Nebraska, USA
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Su Y, Wen H, Zhan G, Zou Z, Li Y. [Plasma and skin tissue endothelin in patients with psoriasis vulgaris]. Hunan Yi Ke Da Xue Xue Bao 1997; 22:530-2. [PMID: 10072997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
The levels of plasma endothelin in 46 patients with psoriasis vulgaris and the levels of endothelin in skin tissue of 25 cases were determined by RIA. The results showed that: (1) The plasma levels of endothelin in patients with psoriasis vulgaris was significantly increased compared with that of the controls (P < 0.01), so was the active stage group compared with the stable stage group (P < 0.01); (2) The level of endothelin in skin lesions of patients was significantly higher than that of the uninvolved skin. These findings suggest that endothelin might play a role in the pathogenesis of psoriasis vulgaris.
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Affiliation(s)
- Y Su
- Department of Dermatology, Second Affiliated Hospital, Hunan Medical University, Changsha
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Abstract
This study examined the relation between self-concept clarity and (a) preferred general coping styles, (b) coping with a specific event, and (c) coping with a specific ongoing situation in 175 undergraduate students. The results of the regression analyses for general coping styles indicated that self-concept clarity made a reliable but weak positive contribution to active coping styles (e.g., planning and taking action) and a strong negative contribution to passive coping styles (e.g, denial). The unique negative contribution of self-concept clarity to passive coping was replicated with respect to coping with a specific event and to coping with a specific ongoing situation. However, the weaker positive contribution of self-concept clarity to active coping was not replicated with respect to coping with specific events or specific ongoing situations.
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