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Catalytic Reaction Kinetics of Propylene Dimerization to 4-Methyl-1-Pentene Using Cu-K/K_(2)CO_(3) Solid Base Catalyst
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作者 Jin Haibo Chai Jing +3 位作者 Yang Suohe He Guangxiang Ma Lei Guo Xiaoyan 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第1期78-87,共10页
The catalysis technology of propylene dimerization to form 4-methyl-1-pentene(4MP1)using a Cu-K/K_(2)CO_(3) solid base catalyst is a well-known heterogeneous catalytic reaction.In this study,the intrinsic kinetics of ... The catalysis technology of propylene dimerization to form 4-methyl-1-pentene(4MP1)using a Cu-K/K_(2)CO_(3) solid base catalyst is a well-known heterogeneous catalytic reaction.In this study,the intrinsic kinetics of propylene dimerization were studied in a fixed-bed continuous reactor.Internal and external diffusion during the dimerization reaction experiments were eliminated by adjusting the flow rate of the carrier gas and the particle size of the catalyst support.Then,the concentration changes of each substance at the outlet of the catalyst bed under different residence times were investigated.Moreover,the suitable reaction kinetics equations was derived using the Langmuir Hinshelwood-Hougen-Watson kinetic model.Finally,the activation energy for each reaction involved in the dimerization reaction was calculated.The activation energies of 4MP1,branched by-products,and 1-hexene were 115.0,150.8,and 177.4 kJ/mol,respectively.The effect of process conditions on propylene dimerization with solid base catalysts was studied through kinetic model simulation.By comparing the theoretical values obtained from the simulation with the experimental results,the applicability and accuracy of the kinetic model were verified. 展开更多
关键词 propylene dimerization 4-methyl-1-pentene intrinsic kinetics surface reaction
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TREM-1 mediates interaction between substantia nigra microglia and peripheral neutrophils
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作者 Tong Shen Guiyun Cui +7 位作者 Hao Chen Long Huang Wei Song Jie Zu Wei Zhang Chuanying Xu Liguo Dong Yongmei Zhang 《Neural Regeneration Research》 SCIE CAS CSCD 2024年第6期1375-1384,共10页
Microglia-mediated neuroinflammation is considered a pathological feature of Parkinson's disease.Triggering receptor expressed on myeloid cell-1(TREM-1)can amplify the inherent immune response,and crucially,regula... Microglia-mediated neuroinflammation is considered a pathological feature of Parkinson's disease.Triggering receptor expressed on myeloid cell-1(TREM-1)can amplify the inherent immune response,and crucially,regulate inflammation.In this study,we found marked elevation of serum soluble TREM-1 in patients with Parkinson's disease that positively correlated with Parkinson's disease severity and dyskinesia.In a mouse model of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced Parkinson's disease,we found that microglial TREM-1 expression also increased in the substantia nigra.Further,TREM-1 knockout alleviated dyskinesia in a mouse model of Parkinson's disease and reduced dopaminergic neuronal injury.Meanwhile,TREM-1 knockout attenuated the neuroinflammatory response,dopaminergic neuronal injury,and neutrophil migration.Next,we established an in vitro 1-methyl-4-phenyl-pyridine-induced BV2 microglia model of Parkinson's disease and treated the cells with the TREM-1 inhibitory peptide LP17.We found that LP17 treatment reduced apoptosis of dopaminergic neurons and neutrophil migration.Moreover,inhibition of neutrophil TREM-1 activation diminished dopaminergic neuronal apoptosis induced by lipopolysaccharide.TREM-1 can activate the downstream CARD9/NF-κB proinflammatory pathway via interaction with SYK.These findings suggest that TREM-1 may play a key role in mediating the damage to dopaminergic neurons in Parkinson's disease by regulating the interaction between microglia and peripheral neutrophils. 展开更多
关键词 1-methyl-4-phenylpyridiniumion dopaminergic neurons infiltration 1-methyl-4-phenyl-1 2 3 6-TETRAHYDROPYRIDINE MICROGLIA NEUTROPHILS neuroinflammation Parkinson's disease SYK TREM-1
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Synthesis, Structural Characterization and Antimicrobial Activity of a Novel Cobalt(II) Complex Based on 3-Methyl-1-Phenyl-4-(2-Thienoyl)-Pyrazol-5-One
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作者 Emeline Sorelle Mefouegang Claudelle Sybilline Anensong Djadock +5 位作者 Golngar Djimassingar Gabriel Tchuente Kamsu Donald Raoul Tchuifon Tchuifon Alain Charly Tagne Kuate Dirk Bockfeld Jean Ngoune 《Journal of Materials Science and Chemical Engineering》 2023年第8期109-126,共18页
New cobalt(II) complex, [Co(O<sub>2</sub>C<sub>15</sub>H<sub>11</sub>N<sub>2</sub>S)<sub>2</sub>(OH<sub>2</sub>)<sub>2</sub>]∙2H<s... New cobalt(II) complex, [Co(O<sub>2</sub>C<sub>15</sub>H<sub>11</sub>N<sub>2</sub>S)<sub>2</sub>(OH<sub>2</sub>)<sub>2</sub>]∙2H<sub>2</sub>O (1∙2H<sub>2</sub>O), has been synthesized upon reaction of cobalt chloride hexahydrate (Co(Cl)<sub>2</sub>∙6H<sub>2</sub>O) with 3-methyl-1-Phenyl-4-(2-thienoyl)-pyrazol-5-one (referred as HL) in ethanol at room temperature. Single crystal X-ray diffraction (XRD), spectroscopic methods, and microelemental analyses were used to characterize 1∙2H<sub>2</sub>O. Compound 1∙2H<sub>2</sub>O crystallizes in the orthorhombic crystal system with a Pbca space group and with the cobalt atom being pseudo-octahedral coordinated. The broth microdilution technique was used to screen the free ligand (HL) and the complex (1∙2H<sub>2</sub>O) for antimicrobial activities. HL has a low activity (MIC > 100 μg/mL) on all microorganisms, whereas compound 1∙2H<sub>2</sub>O displayed moderate activity (10 ∙2H<sub>2</sub>O exhibited bactericidal and fungicidal activity respectively on all the bacteria and yeasts tested. These findings reveal that the antimicrobial activity of HL was enhanced upon coordination to Co(II) ion against all microorganisms (bacteria and fungus). 展开更多
关键词 COBALT ACYLPYRAZOLONE X-Ray Diffraction Antimicrobial Activity 3-methyl-1-Phenyl-4-(2-Thienoyl)-Pyrazol-5-One
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Synthesis, Structural Characterization and Antimicrobial Activity of a Novel Cobalt(II) Complex Based on 3-Methyl-1-Phenyl-4-(2-Thienoyl)-Pyrazol-5-One
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作者 Emeline Sorelle Mefouegang Claudelle Sybilline Anensong Djadock +5 位作者 Golngar Djimassingar Gabriel Tchuente Kamsu Donald Raoul Tchuifon Tchuifon Alain Charly Tagne Kuate Dirk Bockfeld Jean Ngoune 《Journal of Modern Physics》 2023年第8期109-126,共12页
New cobalt(II) complex, [Co(O<sub>2</sub>C<sub>15</sub>H<sub>11</sub>N<sub>2</sub>S)<sub>2</sub>(OH<sub>2</sub>)<sub>2</sub>]∙2H<s... New cobalt(II) complex, [Co(O<sub>2</sub>C<sub>15</sub>H<sub>11</sub>N<sub>2</sub>S)<sub>2</sub>(OH<sub>2</sub>)<sub>2</sub>]∙2H<sub>2</sub>O (1∙2H<sub>2</sub>O), has been synthesized upon reaction of cobalt chloride hexahydrate (Co(Cl)<sub>2</sub>∙6H<sub>2</sub>O) with 3-methyl-1-Phenyl-4-(2-thienoyl)-pyrazol-5-one (referred as HL) in ethanol at room temperature. Single crystal X-ray diffraction (XRD), spectroscopic methods, and microelemental analyses were used to characterize 1∙2H<sub>2</sub>O. Compound 1∙2H<sub>2</sub>O crystallizes in the orthorhombic crystal system with a Pbca space group and with the cobalt atom being pseudo-octahedral coordinated. The broth microdilution technique was used to screen the free ligand (HL) and the complex (1∙2H<sub>2</sub>O) for antimicrobial activities. HL has a low activity (MIC > 100 μg/mL) on all microorganisms, whereas compound 1∙2H<sub>2</sub>O displayed moderate activity (10 ∙2H<sub>2</sub>O exhibited bactericidal and fungicidal activity respectively on all the bacteria and yeasts tested. These findings reveal that the antimicrobial activity of HL was enhanced upon coordination to Co(II) ion against all microorganisms (bacteria and fungus). 展开更多
关键词 COBALT ACYLPYRAZOLONE X-Ray Diffraction Antimicrobial Activity 3-methyl-1-Phenyl-4-(2-Thienoyl)-Pyrazol-5-One
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Flotation behavior and adsorption mechanism of(1-hydroxy-2-methyl-2-octenyl) phosphonic acid to cassiterite 被引量:14
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作者 谭鑫 何发钰 +1 位作者 尚衍波 印万忠 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2469-2478,共10页
The flotation behavior and adsorption mechanism of novel(1-hydroxy-2-methyl-2-octenyl) phosphonic acid(HEPA) to cassiterite were investigated by micro-flotation tests, zeta potential measurements, FTIR determinati... The flotation behavior and adsorption mechanism of novel(1-hydroxy-2-methyl-2-octenyl) phosphonic acid(HEPA) to cassiterite were investigated by micro-flotation tests, zeta potential measurements, FTIR determination and density functional theory(DFT) calculation. The flotation results demonstrated that HEPA exhibited superior collecting performance compared with styrene phosphonic acid(SPA). The cassiterite recovery maintained above 90% over a wide pH range of 2-9 with 50 mg/L HEPA. The results of zeta potential measurement and FTIR detection indicated that the adsorption of HEPA onto cassiterite was mainly attributed to the chemisorption between HEPA monoanions and Sn species on mineral surfaces. The DFT calculation results demonstrated that HEPA monoanions owned higher HOMO energy and exhibited a better affinity to cassiterite than SPA, which provided very clear evidence for the stronger collecting power of HEPA presented in floatation test and zeta potential measurement. 展开更多
关键词 1-hydroxy-2-methyl-2-octenyl) phosphonic acid CASSITERITE adsorption FLOTATION density functional theory
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Protective effect of erythropoietin against 1-methyl-4-phenylpyridinium-induced neurodegenaration in PC12 cells
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作者 吴艳 尚游 +2 位作者 孙圣刚 刘仁刚 杨文琼 《Neuroscience Bulletin》 SCIE CAS CSCD 2007年第3期156-164,共9页
Objective The neuroprotective effect of erythropoietin (EPO) against 1-methyl-4-phenylpyridinium (MPP^+)- induced oxidative stress in cultured PC12 cells, as well as the underlying mechanism, were investigated. M... Objective The neuroprotective effect of erythropoietin (EPO) against 1-methyl-4-phenylpyridinium (MPP^+)- induced oxidative stress in cultured PC12 cells, as well as the underlying mechanism, were investigated. Methods PC12 ceils impaired by MPP^+ were used as the cell model of Parkinson's disease. Methyl thiazolyl tetrazolium (MTT) was used to assay the viability of the PC12 cells exposed to gradient concentrations of EPO, and the terminal deoxynucleotidyl transferase dUTP nick end labelling (TUNEL) assay was used to analyze the apoptosis ratio of PC 12 cells. The expression of Bcl-2 and Bax in PC 12 cells were examined by Western blot, and the reactive oxygen species (ROS), the mitochondrial transmembrane potential and the activity of caspase-3 in each group were detected by spectrofluorometer. Results Treatment of PC12 cells with MPP^+ caused the loss of cell viability, which may be associated with the elevation in apoptotic rate, the formation of ROS and the disruption of mitochondrial transmembrane potential. It was also shown that MPP+ significantly induced the upregulation of Bax/Bcl-2 ratio and the activation of caspase-3. In contrast, EPO significantly reversed these responses and had the maximum protective effect at 1 U/mL. Conclusion The inhibitive effect of EPO on the MPP^+ -induced cytotoxicity may be ascribed to its anti-oxidative property and anti-apoptotic activity, and EPO may provide a useful therapeutic strategy for treatment of neurodegenerative diseases such as Parkinson's disease. 展开更多
关键词 1-methyl-4-PHENYLPYRIDINIUM PC12 cells ERYTHROPOIETIN oxidative stress APOPTOSIS
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Regeneration of 2-amino-2-methyl-1-propanol used for carbon dioxide absorption 被引量:21
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作者 ZHANG Pei SHI Yao WEI Jianwen ZHAO Wei YE Qing 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第1期39-44,共6页
To improve the efficiency of the carbon dioxide cycling process and to reduce the regeneration energy consumption, a sterically hindered amine of 2-amino-2-methyl-1- propranol (AMP) was investigated to determine its... To improve the efficiency of the carbon dioxide cycling process and to reduce the regeneration energy consumption, a sterically hindered amine of 2-amino-2-methyl-1- propranol (AMP) was investigated to determine its regeneration behavior as a CO2 absorbent. The CO2 absorption and amine regeneration characteristics were experimentally examined under various operating conditions. The regeneration efficiency increased from 86.2% to 98.3% during the temperature range of 358 to 403 K. The most suitable regeneration temperature for AMP was 383 K, in this experiment condition, and the regeneration efficiency of absorption/regeneration runs descended from 98.3% to 94.0%. A number of heat-stable salts (HSS) could cause a reduction in CO2 absorption capacity and regeneration efficiency. The results indicated that aqueous AMP was easier to regenerate with less loss of absorption capacity than other amines, such as, monoethanolamine (MEA), diethanolamine (DEA), diethylenetriamine (DETA), and N-methyldiethanolamine (MDEA). 展开更多
关键词 carbon dioxide 2-amino-2-methyl-1-propanol regeneration efficiency energy consumption
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Theoretical Investigation on QSAR of(2-Methyl-3-biphenylyl)methanol Analogs as PD-L1 Inhibitor 被引量:4
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作者 Abdulla Al Mamun Zheng Mei +1 位作者 Ling Qiu Xue-hai Jua 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第4期459-467,I0001,I0002,共11页
Cancer is one of the most serious issues in human life.Blocking programmed cell death protein 1 and programmed death ligand-1(PD-L1)pathway is one of the great innovations in the last few years,a few numbers of inhibi... Cancer is one of the most serious issues in human life.Blocking programmed cell death protein 1 and programmed death ligand-1(PD-L1)pathway is one of the great innovations in the last few years,a few numbers of inhibitors can be able to block it.(2-Methyl-3-biphenylyl)methanol derivative is one of them.Here,the quantitative structure-activity relationship(QSAR)established twenty(2-methyl-3-biphenylyl)methanol derivatives as the programmed death ligand-1 inhibitors.Density functional theory at the B3LPY/6-31+G(d,p)level was employed to study the chemical structure and properties of the chosen compounds.Highest occupied molecular orbital energy EHOMO,lowest unoccupied molecular orbital energy ELUMO,total energy ET,dipole moment DM,absolute hardnessη,absolute electronegativityχ,softness S,electrophilicityω,energy gap?E,etc.,were observed and determined.Principal component analysis(PCA),multiple linear regression(MLR)and multiple nonlinear regression(MNLR)analysis were carried out to establish the QSAR.The proposed quantitative models and interpreted outcomes of the compounds were based on statistical analysis.Statistical results of MLR and MNLR exhibited the coefficient R^2 was 0.661 and 0.758,respectively.Leave-one-out cross-validation,r_m^2 metric,r_m^2 test,and"Golbraikh&Tropsha’s criteria"analyses were applied for the validation of MLR and MNLR,which indicate two models are statistically significant and well stable with data variation in the external validation towards PD-L1.The obtained results showed that the MNLR model predicts the bioactivity more accurately than MLR,and it may be helpful and supporting for evaluation of the biological activity of PD-L1 inhibitors. 展开更多
关键词 Quantitative structure-activity relationship 2-methyl-3-biphenylyl methanol derivatives Programmed death ligand-1 inhibitor Density functional theory
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Effect of insulin on 1-methyl-4-phenylpyridinium ion-induced apoptosis of PC12 cells 被引量:3
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作者 Liping Guo Jian Wang Yuping Jiang 《Neural Regeneration Research》 SCIE CAS CSCD 2006年第4期317-320,共4页
BACKGROUND: Insulin receptor (IR) expression in the substantia nigra of patients with Parkinson disease (PD) is not only significantly lower than that in the substantia nigra of normal persons of the same age, bu... BACKGROUND: Insulin receptor (IR) expression in the substantia nigra of patients with Parkinson disease (PD) is not only significantly lower than that in the substantia nigra of normal persons of the same age, but also significantly lower than that in other regions in brain of himself/herself. It suggests that the abnormal effect of insulin receptor-mediated insulin, as a neurotrophic factor, is very possibly related to the loss of dopaminergic neurons in the substantia nigra and striatum in patients with Parkinson disease. OBJECTIVE : TO observe the interventional effect of insulin on 1-methyl-4-phenylpyridinium ion (MPP^+)-induced apoptosis of PC12. DESIGN: Controlled observation SETTINGS: Department of Neurology, Beijing China-Japan Friendship Hospital; Department of Neurology Huashan Hospital Affiliated to Fudan University. MATERIALS: PC12 cells were provided by the Cell Bank, Shanghai Institute of Cell Biology, Chinese Academy of Science. MPP^+, MTT, HOECHST 33258 (Invitrogen Life Technologies), reverse transcription-polymerase chain reaction (RT-PCR) reagent (Takara Shuzo Co., Ltd.), flow cytometer (Bacton Dickionson, San Jose, CA), enzyme labelling instrument (Bio-Tek, Winooski, VT) and PCR circulation instrument (Takara Shuzo Co., Ltd) were used in this study. METHODS : This study was carried out in the Department of Neurology, Huashan Hospital Affiliated to Fudan University during June 2003 to August 2004. (1) Cell culture and experimental grouping: PC12 cells were cultured according to the method from Peng et al, then were randomized into 3 groups; blank control group, MPP^+ group and insulin group. (2) Detection of relative survival rate of cells: The relative survival rate of cells at different MPP^+ final concentrations (0, 50, 100, 200, 300, 1 000 μmol/L) and at different culture time (0, 4, 8, 12, 18, 24 hours) in the 300 Fmol/L MPP^+ group and different concentrations of insulin (0, 15, 50, 100 nmol/L) in the insulin group was detected with MTT method according to the method from Hansen et al. (3) Observation of cell apoptosis: After stained by HOECHST 33258, the apoptotic cells were observed under the fluorescence miscroscope with the method from Chen et al. (4) Dection of apoptotic rate of cells: Apoptotic rate of cells was detected with flow cytometry according to the method from Zhang et al. (5) The expression of tyrosine hydroxylase (TH) mRNA in PC12 cells was detected with RT-PCR methods according to the modified method from Peng et al. MAIN OUTCOME MEASURES : Comparison of relative survival rate, apoptosis rate, the expression of IR mRNA and TH mRNA and cell apoptosis. RESULTS: (1) After 12-hour incubation of 100, 200, 300 and 1 000 μmol/L MPP^+, the relative survival rate of PC12 cells was (72.88±2.91)%, (60.64±0.81)%, (54.56±0.76)% and (16.89±2.83)%, respectively, which was significantly lower than that of blank control group (100%, P 〈 0.05); After 12, 18 and 24-hour incubation, the relative survival rate of PC12 cells was (54.56±0.76)%, (42.43±0.16)% and (23.56±0.17)% respectively, which was significantly lower than that of blank control group (100%, P〈 0.05); When 15, 50 and 100 nmol/L insulin was pre-added to cells, the relative survival rate was (70.10±0.16)%, (78.01 ±2.43)% and (83.55±1.43)%, respectively, which was significantly higher than MPP^+ alone [(54.56±0.76)%, P 〈 0.05]. (2) Appototic bodies were rarely seen in the blank control group, but densely gathered in the MPP^+ group and were significantly decreased in the insulin group. (3) Apoptosis rate of PC12 cells in the MPP^+ group was significantly higher than that in the blank control group [(36.56±0.89)% vs. (2.34±0.23)%, P〈 0.05], and that in the 15, 50, 100 nmol/L insulin group [(30.01±0.04)%, (24.23±0.37)%, (20.01 ±1.01)%, respectivelyl was significantly lower than that in MPP^+ group (P 〈 0.05). (4) The TH mRNA expression in PC12 cells in MPP^+ group was significantly lower than that in blank control group; The expression of TH mRNA in insulin group was gradually increased in an insulin dose-dependent manner. There were no significant changes in the expression of IR mRNA under different experimental conditions. CONCLUSION: Insulin can resist MPP^+-induced apoptosis of PC12 cells, lessen the damage of PC12 cells, but does not change the gene expression of target cell insulin receptor. 展开更多
关键词 cell MPP Effect of insulin on 1-methyl-4-phenylpyridinium ion-induced apoptosis of PC12 cells PC 33258 MPTP
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Investigation of liquid–liquid equilibrium of the ternary system(water +1,6-diaminohexane + 2-methyl-1-propanol or 3-methyl-1-butanol) at different temperatures 被引量:1
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作者 Yonghui Dou Huanxin Li +2 位作者 Xiaoqiang Gao Guoji Liu Li Xu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第1期191-197,共7页
In this study, the LLE data of ternary system(water + 1,6-diaminohexane + 2-methyl-1-propanol) and(water +1,6-diaminohexane + 3-methyl-1-butanol) were measured at 293.15, 303.15 and 313.15 K under atmospheric pressure... In this study, the LLE data of ternary system(water + 1,6-diaminohexane + 2-methyl-1-propanol) and(water +1,6-diaminohexane + 3-methyl-1-butanol) were measured at 293.15, 303.15 and 313.15 K under atmospheric pressure. Reliability of the experimental tie-line data was checked by empirical Hand, Othmer-Tobias and Bachman equations. Distribution coefficient(D) and selectivity(S) were calculated in order to investigate capability of the studied organic solvents for 1,6-diaminohexane extraction. The high values of separation factors demonstrated that 2-methyl-1-propanol and 3-methyl-1-butanol were applicable for this purpose. The experimental data were correlated by nonrandom two-liquid(NRTL) and universal quasi-chemical(UNIQUAC) models.The percent-root-mean-square deviation(RMSD) values for NRTL and UNIQUAC models were less than 0.15,which indicated that the experimental data have been sufficiently correlated. 展开更多
关键词 Liquid–liquid EQUILIBRIUM 1 6-Diaminohexane 2-methyl-1-propanol 3-methyl-1-butanol NRTL UNIQUAC
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Extraction Behavior of Rare Earths with 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 Using Solid-liquid Extraction Technique 被引量:2
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作者 高锦章 潘仲巍 +2 位作者 杜新贞 康敬万 白光弼 《Rare Metals》 SCIE EI CAS CSCD 1993年第3期198-202,共5页
The extraction behavior of rare earths was studied by using paraffin with ceresin as a diluent containing 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5.In solid phase,the composition of complexes is REP_3.The equilib- rium... The extraction behavior of rare earths was studied by using paraffin with ceresin as a diluent containing 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5.In solid phase,the composition of complexes is REP_3.The equilib- rium extraction constants and pH_(1/2) values of solid-liquid extraction are higher than those of normal liquid-liquid extraction.The extraction efficiency tends to maximum when the ratio of phases is 1:1.When the extraction temperature is higher than the melting point of paraffin and the extraction time is over 10 min,the extraction efficiency keeps constant.Moreover,the relationship among separation factor,equilibrium extrac- tion constant,pH_(1/2) value and atomic number was obtained.The mechanism of solid-liquid extraction is analogous to that of liquid-liquid extraction. 展开更多
关键词 Solid-liquid extraction Rare earths 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5
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Dissolution Properties of 2-(Dinitromethylene)-5-methyl-1,3-diazacyclopentane in Dimethyl Sulfoxide and N-Methyl Pyrrolidone 被引量:2
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作者 XIAO Li-bai XING Xiao-ling +4 位作者 ZHAO Feng-qi XU Kang-zheng YAO Er-gang TAN Yi HAO Hai-xia 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第4期743-746,共4页
The molar enthalpies of dissolution for 2-(dinitromethylene)-5-methyl-1,3-diazacyclopentane(DNMDZ) in dimethyl sulfoxide(DMSO) and N-methyl pyrrolidone(NMP) were measured using an RD496-2000 Calvet microcalori... The molar enthalpies of dissolution for 2-(dinitromethylene)-5-methyl-1,3-diazacyclopentane(DNMDZ) in dimethyl sulfoxide(DMSO) and N-methyl pyrrolidone(NMP) were measured using an RD496-2000 Calvet microcalorimeter at 298.15 K under atmospheric pressure.Empirical formulae for the calculation of the molar enthalpies of dissolution(Δ diss H) were obtained from the experimental data of the dissolution processes of DNMDZ in DMSO or NMP.The relationships between the rate constant(k) and the molality(b) and between the reaction order(n) and the molality(b) were determined.The corresponding kinetic equations describing the two dissolution processes were dα/dt=10^-2.16(1-α) ^1.01 for the dissolution of DNMDZ in DMSO,and dα/dt=10^-2.02(1-α)^ 0.85 for the dissolution of DNMDZ in NMP,respectively. 展开更多
关键词 2-(Dinitromethylene)-5-methyl-1 3-diazacyclopentane DISSOLUTION Kinetics DIMETHYLSULFOXIDE N-Methyl pyrrolidone
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Differential protein expression in substantia nigra induced by 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine in a mouse model of chronic Parkinson’s disease 被引量:2
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作者 Wenbin Tu Furong Xu Guoguang Peng 《Neural Regeneration Research》 SCIE CAS CSCD 2008年第5期482-485,共4页
BACKGROUND: To date, a complete protein expression profile of the midbrain substantia nigra in a mouse model of chronic Parkinson's disease, induced by 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP), does ... BACKGROUND: To date, a complete protein expression profile of the midbrain substantia nigra in a mouse model of chronic Parkinson's disease, induced by 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP), does not exist. In addition, there are no reports of analysis of differential protein expression. OBJECTIVE: To separate and evaluate MPTP-induced differential protein expression through the use of proteomics in the substantia nigra of a mouse model of chronic Parkinson's disease. DESIGN: Randomized controlled animal study. SETTING: Department of Neurology, the First Affiliated Hospital, Chongqing Medical University. MATERIALS: Sixteen 8-10-week old, healthy, male, C57BL mice, weighing 20-25 g, and of clean grade, were provided by the Experimental Animal Center of Chongqing Medical University. The experimental animals were disposed according to ethical criteria. MPTP was provided by Sigma Company, USA; Pdquest 2D image analysis software and gelatum/irradiance image analysis system (ChemiDoc XRS) by Bio-Rad, USA; and Voyager DE-PROMALD1-TOF-MS mass spectroscopy analyzer by AB1 Company, USA. METHODS: This study was performed in Chongqing Neurological Laboratory between November 2006 and July 2007. Mice were randomly divided into model and control groups, with 8 mice in each group. Mice in the model group were received a subcutaneous injection of MPTP (25 mg&g), twice a week, for five successive weeks, to establish a chronic Parkinson's disease model. Mice in the control group received the same volume of a subcutaneous saline injection at the same time points. Mice were sacrificed by anesthesia to rapidly obtain the midbrain for protein separation of the substantia nigra. MAIN OUTCOME MEASURES: (1) 2-ED handbook (Bio-Rad Company) was referenced for two-dimensional electrophoresis, (2) PDQUEST8,0 analytical electrophoresis pattern was adopted to evaluate differential protein expression. (3) Peptide mass finger print map and data were retrieved on http://www.prospector.ucsf.edu to compare differential substantia nigral protein expression in the two groups. RESULTS: Two-dimensional gel electrophoresis of substantia nigra tissue indicated that there were 33 differential protein expressions between the two groups. Three new proteins were evaluated, including α -enolase, which exhibited regulated expression, tumor necrosis factor ligand superfamily member 4, and cyclin-dependent kinase inhibitor 1B. CONCLUSION: There are three proteins that exhibit differential expression in the substantia nigra- α -enolase, tumor necrosis factor ligand superfamily member 4, and cyclin-dependent kinase inhibitor 1B. 展开更多
关键词 Parkinson's disease 1-methyl-4-phenyl-l 2 3 6-tetrahydropyridine mice substantia nigra proteomics
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MORPHOLOGIES AND GAS SEPARATION PROPERTIES OF MELT-SPUN ASYMMETRIC POLY(4-METHYL-1-PENTENE)HOLLOW FIBER MEMBRANES 被引量:2
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作者 徐志康 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2003年第3期369-372,共4页
Poly(4-methyl-1-pentene) (PMP) hollow fiber membranes were prepared by the melt-spun and cold-stretch(MSCS) method. Scanning electronic microscopy (SEM) was used to characterize the section and surface structures of t... Poly(4-methyl-1-pentene) (PMP) hollow fiber membranes were prepared by the melt-spun and cold-stretch(MSCS) method. Scanning electronic microscopy (SEM) was used to characterize the section and surface structures of themembranes with special asymmetric structure. The preliminary results of gas permeation measurements indicated that the resultant hollow fiber membranes have the potential ability for oxygen/nitrogen separation. 展开更多
关键词 Poly(4-methyl-1-pentene) Asymmetric membranes Hollow fiber membrane Gas permeation O_2/N_2 Separation
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Synthesis and Crystal Structure of Trans-4-[(5-(2,4-Dichlorophenoxy)-3-methyl-1-phenyl-1H-pyrazol-4-yl)methyleneamino]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one 被引量:4
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作者 孙凤梅 田孟魁 +1 位作者 杨靖华 连照勋 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2008年第7期789-792,共4页
The title compound trans-4-[(5-(2,4-dichlorophenoxy)-3-methyl- 1-phenyl-1H-pyrazol-4-yl)methyleneamino]- 1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one 3 (C28H23Cl2N5O2, Mr = 532.41) has been synthesized and its... The title compound trans-4-[(5-(2,4-dichlorophenoxy)-3-methyl- 1-phenyl-1H-pyrazol-4-yl)methyleneamino]- 1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one 3 (C28H23Cl2N5O2, Mr = 532.41) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction analysis. It crystallizes in triclinic, space group P1- with a = 8.9438(4), b = 11.6065(5), c = 14.2215(6)A, α = 112.566(1), β = 92.324(2), γ = 102.91(1)°, V= 1315.65(10) A^3, Z = 2, Dc = 1.344 g/cm^3,μ(MoKa) = 0.282 mm^-1, λ = 0.71073 A, F(000) = 552, the final R = 0.0587 and wR = 0.1578 for 5071 observed reflections (I 〉 2σ(I)). X-ray analysis reveals that the product is a thermodynamically stable trans isomer. Intra- and intermolecular C( 12)-H(12)…O(1) and C(28)-H(28)...O(1)# 1 hydrogen bonds were observed in the title compound. 展开更多
关键词 trans-4-[ 5-(2 4-dichlorophenoxy)-3-methyl- 1-phenyl- 1H-pyrazol-4-yl)methylene amino]-1 5-dimethyl-2-phenyl-1 2-dihydropyrazol-3-one synthesis crystal structure
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Organic Synthesis in Ionic Liquids: Condensation of 3-Methyl-1-phenyl-5-pyrazolone with Carbonyl Compounds Catalyzed by Ethylenediammonium Diacetate (EDDA) 被引量:1
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作者 Yi HU Ping WEI +2 位作者 Hua ZHOU Ping Kai OUYANG Zhen Chu CHEN 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第3期299-301,共3页
An efficient and environmental benign method is reported for the condensation of 3-methyl-1-phenyl-5-pyrazolone with carbonyl compounds in ionic liquids [Bmim]BF4 and [Bmim]PF6 catalyzed by ethylenediammonium diacetate.
关键词 Ionic liquids CONDENSATION 3-methyl-1-phenyl-5-pyrazolone.
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1-methyl-4-phenylpyridinium ion induces endoplasmic reticulum stress through glycogen synthase kinase-3 beta activation in PC12 cells 被引量:1
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作者 Shengdong Wang Fucheng Luo Yan Chen Lei Qi Jie Bai 《Neural Regeneration Research》 SCIE CAS CSCD 2011年第11期805-810,共6页
1-methyl-4-phenylpyridinium ion (MPP^+) induces endoplasmic reticulum stress and activates caspase-12 in PC12 cells, leading to neuronal apoptosis. However, the underlying molecular mechanism remains unknown. The p... 1-methyl-4-phenylpyridinium ion (MPP^+) induces endoplasmic reticulum stress and activates caspase-12 in PC12 cells, leading to neuronal apoptosis. However, the underlying molecular mechanism remains unknown. The present study investigated the regulatory effects of nerve growth factor (Akt activator) and lithium chloride (glycogen synthase kinase-3β inhibitor) on the endoplasmic reticulum stress signaling pathway. The results revealed that MPP+ induced expression of Bip and C/EBP homologous protein. The upregulation of Bip and C/EBP homologous protein, as well as the decreased pro-caspase-12 level induced by MPP^+ were inhibited by pretreatment of the nerve growth factor or lithium chloride. These results suggest that the phosphatidylinositol 3 kinase-Aktglycogen synthase kinase-3β pathway is involved in MPP-induced endoplasmic reticulum stress. 展开更多
关键词 Parkinson's disease 1-methyl-4-phenylpyridinium ion endoplasmic reticulum stress glycogen synthase kinase-3β
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Synthesis of 1,2,3,4-Tetrahydro-1-Indolizinones and 3-Methyl-1,2-dihydro-1-Pyrrolizinones 被引量:1
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作者 Ji Yun LIU Shou Fang ZHANG(Shenyang Pharmaceutical University,Shenyang 110015) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第7期577-578,共2页
4-(1-Pyrrolyl)butanenitrile(4), the key intermediate for the synthesis of 1,2,3,4-tetrahydro-1-indolizinone, was prepared with Clauson-Kass reation. When pyrrole reacted with 4-bromobutanenitrile in PEG-400 dimethyl e... 4-(1-Pyrrolyl)butanenitrile(4), the key intermediate for the synthesis of 1,2,3,4-tetrahydro-1-indolizinone, was prepared with Clauson-Kass reation. When pyrrole reacted with 4-bromobutanenitrile in PEG-400 dimethyl ether catalyzed by NaOH, 3-(1-pyrrolyl)butanenitrile was obtained. The nitriles were converted into the corresponding ketones by Hoesch reaction. Some of the ketone derivatives were prepared. 展开更多
关键词 PH Synthesis of 1 2 3 4-Tetrahydro-1-Indolizinones and 3-methyl-1 2-dihydro-1-Pyrrolizinones
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Minocycline protects the apoptosis of PC12 cells induced by 1-methyl-4-phenylpyridinium 被引量:1
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作者 Wei SHEN Shenggang SUN Xuebing CAO 《Journal of Nanjing Medical University》 2005年第5期247-250,共4页
Objective: To explore the protective effect of minocycline on the apoptosis of cellular parkinsonism models induced by MPP^+ . Methods: Using PC12 cells as the apoptotic model of dopaminergic neurons, MC and MPP^+... Objective: To explore the protective effect of minocycline on the apoptosis of cellular parkinsonism models induced by MPP^+ . Methods: Using PC12 cells as the apoptotic model of dopaminergic neurons, MC and MPP^+ were added into the culture medium of PC12 cells, and using MTr to assay the cell viability and metabolic state; The cells apoptosis was assayed by electrophoresis method and using flow cytometry FACS to assay the apoptosis ratio. Results: Added the MPP^+ to get the concentration of 10μmol/L, the cellular parkinsonism model of apoptosis had been prepared. The pre-treatment of MC ( 100/μmol/L) could significantly increase the PC12 cell viability. The apoptosis ratio of MC+MPP^+ group was significantly lower than that of MPP^+ group, but was still significantly higher than that of control group. Conclusion: MC may protect the cell apoptosis induced by MPP^+ to some extent. 展开更多
关键词 MINOCYCLINE PC12 cell apoptosis parkinson disease 1-methyl-4-mhenylpyridinium
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Synthesis and Crystal Structure of Ethyl 3-(4-Chlorophenyl)-3,4-dihydro-6-methyl-4-oxo-2-(pyrrolidin-1-yl)furo[2,3-d]pyrimidine-5-carboxylate 被引量:2
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作者 胡扬根 徐靖 丁明武 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2009年第6期689-692,共4页
The crystal structure of the title compound ethyl 3-(4-chlorophenyl)-3,4-dihydro-6- methyl-4-oxo-2-(pyrrolidin-1-yl)furo[2,3-d]pyrimidine-5-carboxylate (C20H20ClN3O4, Mr= 401.84) has been prepared and determined... The crystal structure of the title compound ethyl 3-(4-chlorophenyl)-3,4-dihydro-6- methyl-4-oxo-2-(pyrrolidin-1-yl)furo[2,3-d]pyrimidine-5-carboxylate (C20H20ClN3O4, Mr= 401.84) has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/n with a = 20.6215(9), b = 8.5311(4), c = 21.6886(9) A^°, β = 91.607(1)°, V = 3814.0(3)A^°^3, Z = 8, Dc = 1.400 g/cm^3, F(000) = 1680, μ = 0.233 mm^-1, R = 0.0718 and wR = 0.1545 for 6717 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals two crystallographically independent molecules in the asymmetric unit. 展开更多
关键词 crystal structure ethyl 3-(4-ehlorophenyl)-3 4-dihydro-6-methyl-4-oxo-2- (pyrrolidin-1-yl)furo[2 3-d]pyrimidine-5-earboxylate aza-Wittig reaction synthesis
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