Sample records for dimethylbenzenes

  1. Interaction of positional isomers of dimethylbenzene with graphite

    Pokrovskiy, O. I.; Ustinovich, K. B.; Usovich, O. I.; Parenago, O. O.; Lunin, V. V.


    The optimized geometries and interaction energies of the intermolecular heterodimers of coronene with o-, m-, and p-dimethylbenzenes (xylenes) calculated by DFT in the PBE0 and B97D functionals were compared. The applicability of coronene as a model for qualitative assessment of the interaction of mononuclear aromatic compounds with the graphite surface was demonstrated. The necessity of including long-range dispersion interactions in DFT calculations of the dimerization energies of aromatic systems was shown. The sorption enthalpies of p- and m-xylenes were shown to be almost equal irrespective of the conditions of the chromatographic experiment. The preferred sorption of p- over m-xylene on graphite is solely due to the entropy factor.

  2. Vapor pressure, density, viscosity and refractive index of dimethyl sulfoxide + 1,4-dimethylbenzene system



    Full Text Available This paper reports the experimental results of isothermal vapor–liquid equilibrium data between 303.15 and 333.15 K, and densities, viscosities, refractive indices from 298.15 to 323.15 K of the dimethyl sulfoxide + 1,4-dimethylbenzene system over the entire range of mixture composition. The obtained PTX data were correlated by the Wilson and NRTL models and estimated by the UNIFAC model. The excess Gibbs energy and activity coefficients were calculated and compared with others excess properties. Excess molar volumes, viscosity deviations and deviations in refractivity were calculated from the experimental data; all the computed quantities were fitted to the Redlich–Kister equation. The resulting excess functions were interpreted in terms of structure and interactions.

  3. Thermophysical Properties of Binary Mixtures of Dimethylsulfoxide with 1-Phenylethanone and 1,4-Dimethylbenzene at Various Temperatures

    Harmandeep Singh Gill


    Full Text Available This research article reports the experimental results of the density, viscosity, refractive index, and speed of sound analysis of binary mixtures of dimethylsulfoxide (DMSO + 1-phenylethanone (acetophenone and + 1,4-dimethylbenzene (para-xylene over the whole composition range at 313.15, 318.15, 323.15, and 328.15 K and at atmospheric pressure. The excess molar volumes (VE, viscosity deviations (Δη, excess Gibbs energy of activation (GE, deviations in isentropic compressibility (KSE, deviations in speed of sound (uE, and deviations in the molar refraction (ΔR were calculated from the experimental data. The computed quantities were fitted to the Redlich-Kister equation to derive the coefficients and estimate the standard error values. The viscosities have also been correlated with two, and three-parameter models, that is, Heric correlation, McAllister model, and Grunberg-Nissan correlation, respectively.

  4. Volumetric Properties of the Mixture Cyclohexanone C6H10O + C8H10 1,4-Dimethylbenzene (VMSD1212, LB4825_V)

    Cibulka, I.; Fontaine, J.-C.; Sosnkowska-Kehiaian, K.; Kehiaian, H. V.

    This document is part of Subvolume B 'Binary Liquid Systems of Nonelectrolytes II' of Volume 26 'Heats of Mixing, Vapor-Liquid Equilibrium, and Volumetric Properties of Mixtures and Solutions' of Landolt-Börnstein Group IV 'Physical Chemistry'. It contains the Chapter 'Volumetric Properties of the Mixture Cyclohexanone C6H10O + C8H10 1,4-Dimethylbenzene (VMSD1212, LB4825_V)' providing data by calculation of molar excess volume from low-pressure density measurements at variable mole fraction and constant temperature.

  5. Volumetric Properties of the Mixture Cyclohexanone C6H10O + C8H10 1,4-Dimethylbenzene (VMSD1111, LB4821_V)

    Cibulka, I.; Fontaine, J.-C.; Sosnkowska-Kehiaian, K.; Kehiaian, H. V.

    This document is part of Subvolume B 'Binary Liquid Systems of Nonelectrolytes II' of Volume 26 'Heats of Mixing, Vapor-Liquid Equilibrium, and Volumetric Properties of Mixtures and Solutions' of Landolt-Börnstein Group IV 'Physical Chemistry'. It contains the Chapter 'Volumetric Properties of the Mixture Cyclohexanone C6H10O + C8H10 1,4-Dimethylbenzene (VMSD1111, LB4821_V)' providing data from direct low-pressure measurement of mass density at variable mole fraction and constant temperature, in the single-phase region(s).

  6. Volumetric Properties of the Mixture Cyclohexanone C6H10O + C8H10 1,4-Dimethylbenzene (VMSD1511, LB4830_V)

    Cibulka, I.; Fontaine, J.-C.; Sosnkowska-Kehiaian, K.; Kehiaian, H. V.

    This document is part of Subvolume B 'Binary Liquid Systems of Nonelectrolytes II' of Volume 26 'Heats of Mixing, Vapor-Liquid Equilibrium, and Volumetric Properties of Mixtures and Solutions' of Landolt-Börnstein Group IV 'Physical Chemistry'. It contains the Chapter 'Volumetric Properties of the Mixture Cyclohexanone C6H10O + C8H10 1,4-Dimethylbenzene (VMSD1511, LB4830_V)' providing data from direct measurement of low-pressure thermodynamic speed of sound at variable mole fraction and constant temperature, in the single-phase region(s).

  7. Quantitative Analysis of the Mixture of Butyl Acetate,Dimethylbenzene and Benzene with Gas Chromatography%气相色谱法同时测定醋酸丁酯、二甲苯和苯

    刘伟; 吴宪龙


    采用气相色谱法,以甲酸甲酯为内标物,对在所研制催化剂作用下氧化反应前后的醋酸丁酯、二甲苯和苯进行了一次定量分析。色谱条件为10%PEG-2万101白色硅烷化担体,2 m×3 mm色谱柱,柱温110℃,检测温度130℃。得到苯、醋酸丁酯、二甲苯和内标物的保留时间分别为1.13、3.45、4.47和2.52(min),方法回收率97.4%~101.84%,线性相关系数大于0.980。结果表明,方法简便、准确、快速%The quantitative analysis of the mixture of butyl acetate, dimethylbenzene and benzene is done. with gas chromatography, taking methyl formate as internal standard. The chromatography conditions are: 10% PEG-20000 on 101 white silanization supporter, 2 m× 3 mm chromatographic column at column temperature of 110℃ and detecting temperature being 130℃. The retention time of benzene, butyl acetate, dimethylbenzene and internal standard of butyl formate are respectively 1.13,3.45, 4.47 and 2.52(minutes). The recoveries are between 97.4% and 101.84%. The linear correlation coefficients are more than 0.980. the results show that the adopted method is simple, accurate and quickly.

  8. 2-Bromo-5-iodo-1,3-dimethylbenzene

    Rui Liu


    Full Text Available In the molecule of the title compound, C8H6BrI, the H atoms of methyl groups are disordered; site-occupation factors were fixed at 0.50. The non-H atoms all lie on a crystallographic mirror plane. Weak intramolecular C—H...Br hydrogen bonds result in the formation of two non-planar five-membered rings.

  9. Bis(acetato-κObis(4,5-dimethylbenzene-1,2-diamine-κNzinc

    David K. Geiger


    Full Text Available The structure of the title compound, [Zn(CH3COO2(C8H12N22], has one half molecule in the asymmetric unit. The ZnII atom is situated on a twofold rotation axis and is tetrahedrally coordinated by two N and two O atoms. The crystal packing displays intermolecular N—H...O hydrogen bonds and intramolecular N—H...O and N—H...N hydrogen bonding.

  10. Poly[tris(2,5-dimethylbenzene-1,4-dicarboxylatobis(pyridinetrizinc(II

    Li Nie


    Full Text Available The asymmetric unit of the title polymeric compound, [Zn3(C10H8O43(C5H5N2]n or [Zn3(dmbdc3(py2]n (dmbdc = 2,5-dimethylbenzenedicarboxylate; py = pyridine contains two Zn(II ions, one of which is located on an inversion centre, one and a half 2,5-dimethylbenzenedicarboxylate ligands and one pyridine ligand. Each ZnO6 octahedron is sandwiched between two ZnO4N square-pyramids, forming a trinuclear zinc secondary building unit (SBU; each SBU is further linked by six 2,5-dimethylbenzenedicarboxylate ligands with six adjacent trinuclear zinc SBU's, forming a two-dimensional layer structure with a (3,6 net. One of the three zinc ions is octahedrally coordinated and the other two are square-pyramidally coordinated. The coordination modes for 2,5-dimethylbenzenedicarboxylates are bis(bidentate or bidentate-tridentate.

  11. Synthesis of Three Methylbenzaldehydes from Dimethylbenzene by Indirect Electrooxidation under Ultrasound Irradiation%超声间接电氧化合成三种甲基苯甲醛

    阚显文; 陶海升; 杜俊; 周运友; 方宾



  12. Long-lasting neurobehavioral effects of prenatal exposure to xylene in rats

    Hass, Ulla; Lund, S. P.; Simonsen, L.


    The persistence of neurobehavioral effects in female rats (Mol:WIST) exposed to 500 ppm technical xylene (dimethylbenzene, GAS-no 1330-20-7) for 6 hours per day on days 7-20 of prenatal development was studied. The dose level was selected so as not to induce maternal toxicity or decreased viability...

  13. Influence of solvents on extraction of U(Ⅵ) by N,N'-didecanoylpiperazine


    Extraction behavior of N, N'-didecanoylpiperazine (DDPEZ) for U(Ⅵ)in a series of solvents from aqueous nitric acid media was investigated for the first time.The dependence of distribution ratios on the concentration of aqueous nitric acid.extractant and temperature has been discussed. The increasing sequence of extractiveability of DDPEZ is given: chloroform, carbon tetrachloride, dimethylbenzene, toluene,benzene.``

  14. Research on the Analysis Method of Micro Concentration of Uranium


    Spectrophotometric method is used for the analysis of micro concentration of uraninum in aqueousand organic phase in order to test the feasibility of TBP/OK-dimethylbenzene-TTA method for assayingorganic phase and concentrated hydrochloric acid-arsenazo Ⅲ method for assaying aqueous phase. It is

  15. Effects of prenatal exposure to xylene on postnatal development and behavior in rats

    Hass, Ulla; Lund, S. P.; Simonsen, L.;


    The effects of prenatal exposure to the organic solvent xylene (dimethylbenzene, GAS-no 1330-20-7) on postnatal development and behavior in rats were studied. Pregnant rats (Mol:WIST) were exposed to 500 ppm technical xylene 6 h per day on gestation days 7-20. The dose level was selected so as no...

  16. [Occupational hazard risk assessment of workers exposed to benzene in a petrochemical enterprise in Shanghai, China].

    Lu, Y; Huang, J S; Zhou, Y L; Sun, P


    Objective: To investigate the exposure to benzene, methylbenzene, and dimethylbenzene in workers in a petrochemical enterprise in Shanghai, China, and to conduct occupational hazard risk assessment. Methods: The environmental monitoring data on benzene series in the workplace of this petrochemical enterprise from 2010 to 2014 were collected, as well as workers' general status. The inhalation risk assessment model developed by United States Environmental Protection Agency (EPA) was used for risk assessment to determine the occupational hazard risk level of benzene, methylbenzene, and dimethylbenzene. Results: The pass rate of the monitoring concentration of benzene, methylbenzene, and dimethylbenzene in the workplace of this petrochemical enterprise was 100%. The results of the EPA model showed that benzene had a high carcinogenic risk, benzene and dimethylbenzene had a high non-carcinogenic risk, and methylbenzene had a low non-carcinogenic risk. Conclusion: The workers exposed to benzene in this petrochemical enterprise have a high health risk, and the EPA model can be used for occupational hazard risk assessment in chemical industry.

  17. Crystal structure of 1-(2,4-dimethylphenyl-2-(4-trimethylsilyl-1H-1,2,3-triazol-1-ylethanone

    G. B. Venkatesh


    Full Text Available The asymmetric unit of the title compound, C15H21N3OSi, contains two molecules with similar conformations (r.m.s. overlay fit for the 20 non-H atoms = 0.163 Å. The dihedral angles between the planes of the 1,2,3-triazole and 2,4-dimethylbenzene rings are 27.0 (3 and 19.5 (3°. In the crystal, molecules are linked by very weak C—H...O and C—H...N hydrogen bonds to generate [100] chains. The chains are cross-linked by C—H...π interactions.

  18. 2,4,8,10,13-Pentamethyl-6-phenyl-13,14-dihydro-12H-6λ5-dibenzo[d,i][1,3,7,2]dioxazaphosphecin-6-thione

    M. Krishnaiah


    Full Text Available In the title compound, C25H28NO2PS, the cyclodecene ring exhibits a crown conformation. The two dimethylbenzene rings which are fused symmetrically on either side of the ten-membered ring, make dihedral angles of 20.2 (1 and 18.0 (1°. The phenyl ring substituted at P is perpendicular to the heterocyclic ring, making a dihedral angle of 88.4 (1°. The crystal structure is stabilized by very weak intramolecular C—H...O hydrogen bonding.

  19. Resonance Energy of an Arene Hydrocarbon from Heat of Combustion Measurements.

    Kolesnichenko, Vladimir L


    A simple experimental method for determination of the resonance energy by measuring the energies of combustion for two isomeric compounds, aromatic 1-tert-butyl-3,5-dimethylbenzene and nonaromatic trans,trans,cis-1,5,9-cyclododecatriene is proposed. Both compounds not only have the same molecular formula, but also contain the same number of sp(2) and sp(3) carbon atoms. After converting the obtained values into the gas phase heats of combustion and subtracting one value from another, the resulting mean resonance energy of 184 kJ/mol was obtained. The proposed method can be offered as an experiment for an undergraduate physical chemistry lab curriculum.

  20. 信息动态%Anti-inflammatory and analgesic effects of granule to pelvic inflammation


    Objective To study anti-inflammatory and analgesic effects of granucle to pelvic inflammation. Methods The anti-inflammatory effects were studied by dimethylbenzene-induced swelling oar in mouse, carrageenin induced paw edema and tampon-induced proliferation in rats. The analgesic effects were studied by acetic acid-induced writhing and optothermal-induced pain in mice. Results Granule to pelvic inflammation significantly reduced swelling oar in mouse, paw edema and proliferation in rats;prolonged latency of writhing test, reduced the writhing number and improved optothermal-induced analgesia percentage. Conclusion Granule to pelvic inflammation has anti-inflammatory and analgesic effects.

  1. Chlorination of (PheboxIr(mesityl(OAc by Thionyl Chloride

    Meng Zhou


    Full Text Available Pincer (PheboxIr(mesityl(OAc (2 (Phebox = 3,5-dimethylphenyl-2,6-bis(oxazolinyl complex, formed by benzylic C-H activation of mesitylene (1,3,5-trimethylbenzene using (PheboxIr(OAc2OH2 (1, was treated with thionyl chloride to rapidly form 1-(chloromethyl-3,5-dimethylbenzene in 50% yield at 23 °C. A green species was obtained at the end of reaction, which decomposed during flash column chromatography to form (PheboxIrCl2OH2 in 87% yield.


    Wang, Ying; Li, Guan-Hao; Liu, Xin-Yu; Xu, Lu; Wang, Sha-Sha; Zhang, Xue-Mei


    Traditional Chinese medicine Taraxacum officinale has been widely used to treat various inflammatory diseases. Taraxasterol is one of the main active components isolated from Taraxacum officinale. Recently, we have demonstrated that taraxasterol has the in vitro anti-inflammatory effects. This study aims to determine the in vivo anti-inflammatory effects of taraxasterol against animal models. Anti-inflammatory effects were assessed in four animal models by using dimethylbenzene-induced mouse ear edema, carrageenan-induced rat paw edema, acetic acid-induced mouse vascular permeability and cotton pellet-induced rat granuloma tests. Our results demonstrated that taraxasterol dose-dependently attenuated dimethylbenzene-induced mouse ear edema and carrageenan-induced rat paw edema, decreased acetic acid-induced mouse vascular permeability and inhibited cotton pellet-induced rat granuloma formation. Our finding indicates that taraxasterol has obvious in vivo anti-inflammatory effects against animal models. It will provide experimental evidences for the traditional use of Taraxacum officinale and taraxasterol in inflammatory diseases.

  3. Torsional, Vibrational and Vibration-Torsional Levels in the S_{1} and Ground Cationic D_{0}^{+} States of Para-Xylene

    Gardner, Adrian M.; Tuttle, William Duncan; Groner, Peter; Wright, Timothy G.


    Insight gained from examining the "pure" torsional, vibrational and vibration-torsional (vibtor) levels of the single rotor molecules: toluene (methylbenzene) and para-fluorotoluene (pFT), is applied to the double rotor para-xylene (p-dimethylbenzene) molecule . Resonance-enhanced multiphoton ionization (REMPI) spectroscopy and zero-kinetic-energy (ZEKE) spectroscopy are employed in order to investigate the S_{1} and ground cationic states of para-xylene. Observed transitions are assigned in the full molecular symmetry group (G_{72}) for the first time. J. R. Gascooke, E. A. Virgo, and W. D. Lawrance, J. Chem. Phys., 143, 044313 (2015). A. M. Gardner, W. D. Tuttle, L. Whalley, A. Claydon, J. H. Carter and T. G. Wright, J. Chem. Phys., 145, 124307 (2016). A. M. Gardner, W. D. Tuttle, P. Groner and T. G. Wright, J. Chem. Phys., (2017, in press).

  4. PAM-PAA microgel inverse opal photonic crystal and pH response


    The colloidal crystal template or opal with a closed-packed face-centered cubic (fcc) lattice was prepared from monodisperse polystyrene (PS) spheres by vertical sedimentation. The template provided void space for infiltration of monomer precursor composed of acrylate acid, acrylamide and ammonium persulfate, as well as microgel from the subsequent copolymerization. The sample was immersed in dimethylbenzene for completely removing PS spheres to form PAM inverse opal hydrogels (IOHPAM) or PAM/PAA inverse opal hydrogels (IOHPAM/PAA) photonic crystals. The PS spheres were replaced by air spheres, which interconnected each other through the windows. The study of responses to pH show that there are two peaks for both IOHPAM and IOHPAM/PAA films, but the IOHPAM/PAA peaks shift to higher pH, and the peaks are independent with the AA content.


    吕鸿; 张文申; 许峰; 刘志娟


    A gas chromatograpic method for measuring benzene, toluene, dimethylbenzene quickly and simultaneously in the adhesives of decoration materials was established. Ethyl acetate was used for dissolving the sample, polyethylene glycol chromatographic column, hydrogen flames detector were employed to separate and detect the compounds and external standard method was used for quantitation. The contents of benzene, toluene, dimethylbenzene were linear with peak areas in the range of 8.58 - 171.40 μg/mL,9.04 - 180.62 μg/mL,8.80 - 175.92 μg/mL respectively, with linear correlation coefficient of 0.999. The detection limits of benzene, toluene, dimethylbenzene were 0.20 μg/mL, the rate of recoveries were 97.14% - 100.16% , 98.51% - 101.44% ,97.87% - 100.80% respectively, RSDs were 1.36% -2.44% (n =6). The method is quick, sensitive, accurate and suitable for determination of the benzene, toluene, dimethylbenzene in the adhesives of decoration materials.%建立了快速、同时测定室内装饰装修材料胶黏剂中苯、甲苯、二甲苯含量的气相色谱检测法.样品用乙酸乙酯溶解处理后,用改性的聚乙二醇(FFAP)毛细管色谱柱分离,氢火焰离子化检测器检测,外标法定量.胶粘剂中苯、甲苯、二甲苯的浓度分别在8.58~171.40μg/mL、9.04~180.62μg/mL、8.80~175.92μg/mL范围内与峰面积呈良好的线性关系,线性相关系数均为0.999.苯、甲苯、二甲苯检出限均为0.20μg/mL,加标回收率分别为97.14%-100.16%、98.51%-101.44%、97.87%-100.80%,测定结果的相对标准偏差为1.36%-2.44%(n=6).该方法简便、灵敏、准确,适于室内装饰装修材料胶黏剂中苯、甲苯、二甲苯残留量的快速同时测定.

  6. Electron ionization of o-xylene, m-xylene and p-xylene

    Jiao, C. Q.; Adams, S. F.


    Cross sections of electron ionization of three isomeric xylenes, in an electron energy range of 10-200 eV, are measured. The maximum total cross sections are observed at 80-eV electron energy to be 2.24, 2.10 and 2.05 × 10-15 cm2 for m-xylene, p-xylene and o-xylene, respectively. The xylene compounds produce similar ion populations, with major product ions including C8H7,9,10+, C7H7+, C6H5-7+, C5H5+, C4H3+ and C3H3+. The similar ion populations can be explained through consideration of the fragmentation mechanism: essentially all fragment ions are formed via initial isomerization of the parent ions from the dimethylbenzene structures to the 7-methylcycloheptatriene structure.

  7. [Inhibition of aromatics on ammonia-oxidizing activity of sediment].

    Dong, Chun-hong; Hu, Hong-ying; Wei, Dong-bin; Huang, Xia; Qian, Yi


    The inhibition of 24 aromatics on ammonia-oxidizing activity of nitrifying bacteria in sediment was measured. The effects of the kind, number and position of substituted groups on ammonia-oxidizing activity of nitrifying bacteria were discussed. The inhibition of mono-substituted benzenes on ammonia-oxidizing activity of nitrifying bacteria were in order of -OH > -NO2 > -NH2 > -Cl > -CH3 > -H. The position of substituted groups of di-substituted benzenes also affected the inhibition, and the inhibitions of dimethylbenzenes(xylene) were in order of meta-> ortho-> para-. The increase in number of substituted group on benzene-ring enhanced the inhibition of aromatics studied in this study on nitrifying bacteria. There was a linear relationship between inhibition (IC50, mumol.L-1) of aromatics on ammonia-oxidizing activity and total electronegativity (sigma E) of aromatics: lgIC50 = 14.72 - 0.91 sigma E.

  8. Super-hydrophobic Silver-Doped TiO2 @ Polycarbonate Coatings Created on Various Material Substrates with Visible-Light Photocatalysis for Self-Cleaning Contaminant Degradation

    Li, Zhengjian; Sun, Zongzhao; Duan, Zhiqiang; Li, Rui; Yang, Yanli; Wang, Jingyi; Lv, Xiaoxia; Qi, Wei; Wang, Hua


    In the present work, a facile and efficient fabrication method has been developed for creating super-hydrophobic coatings of silver-doped TiO2@polycarbonate (TiO2 (Ag)@PC) on the substrates of different materials with photocatalytic self-cleaning performances simply by the “dipping and drying” process. The substrates were first patterned with glue and then deposited with the dopamine-capped TiO2 (Ag)@PC (DA-TiO2 (Ag)@PC) nanocomposites, followed by the further etching with dimethylbenzene. The so prepared super-hydrophobic E-DA-TiO2(Ag)@PC coatings could present the lotus leaf-like porous architectures, high adhesion stability, and especially the visible-light photocatalysis for organic contaminant degradation, thus promising the wide outdoor and indoor applications like water proofing, metal erosion protection, and surface self-cleaning. PMID:28218285

  9. Mesoscopic Simulation of Aggregates in Surfactant/Oil/Water Systems

    苑世领; 蔡政亭; 徐桂英


    The aggregates in sodium dedecylsulphate(SDS)/dimethylbenzene/water systems have been investigated using dissipative particles dynamic(DPD) simulation method.Through analyzing three-dimensional structures of aggregates,three simulated results are found.One is the phase separation,which is clearly observed by water density and the aggregates in the simulated cell;another is the water morphology in reverse micelle,which can be found through the isodensity slice of water including bound water,trapped water and bulky water;the third is about the water/oil interface,i.e.,ionic surfactant molecules,SDS,prefer to exist in the interface between water and oil phase at the low concentraion.

  10. Crystal structure of 1-(2,4-di-methyl-phen-yl)-2-(4-tri-methyl-silyl-1H-1,2,3-triazol-1-yl)ethanone.

    Venkatesh, G B; Nagarajaiah, H; Prasad, N L; HariPrasad, S; Begum, Noor Shahina


    The asymmetric unit of the title compound, C15H21N3OSi, contains two mol-ecules with similar conformations (r.m.s. overlay fit for the 20 non-H atoms = 0.163 Å). The dihedral angles between the planes of the 1,2,3-triazole and 2,4-di-methyl-benzene rings are 27.0 (3) and 19.5 (3)°. In the crystal, mol-ecules are linked by very weak C-H⋯O and C-H⋯N hydrogen bonds to generate [100] chains. The chains are cross-linked by C-H⋯π inter-actions.

  11. Super-hydrophobic Silver-Doped TiO2 @ Polycarbonate Coatings Created on Various Material Substrates with Visible-Light Photocatalysis for Self-Cleaning Contaminant Degradation

    Li, Zhengjian; Sun, Zongzhao; Duan, Zhiqiang; Li, Rui; Yang, Yanli; Wang, Jingyi; Lv, Xiaoxia; Qi, Wei; Wang, Hua


    In the present work, a facile and efficient fabrication method has been developed for creating super-hydrophobic coatings of silver-doped TiO2@polycarbonate (TiO2 (Ag)@PC) on the substrates of different materials with photocatalytic self-cleaning performances simply by the “dipping and drying” process. The substrates were first patterned with glue and then deposited with the dopamine-capped TiO2 (Ag)@PC (DA-TiO2 (Ag)@PC) nanocomposites, followed by the further etching with dimethylbenzene. The so prepared super-hydrophobic E-DA-TiO2(Ag)@PC coatings could present the lotus leaf-like porous architectures, high adhesion stability, and especially the visible-light photocatalysis for organic contaminant degradation, thus promising the wide outdoor and indoor applications like water proofing, metal erosion protection, and surface self-cleaning.

  12. 基于动态溶胀法制备中空聚合物微球%Synthesis of hollow polymer microspheres by dynamic swelling method

    段涛; 张力; 聂冬梅; 杨波; 姬彦玲; 唐永建


    以表面带正电荷的μm级聚苯乙烯微球为种子,经过甲苯、二乙烯基苯溶胀,聚合与包覆等过程制备了直径约5μm的中空聚合物微球.研究了溶剂类型、溶剂用量对动态溶胀法制备的中空聚合物微球粒径、分布和结构的影响,讨论了中空聚合物微球的形成机理.结果表明:添加一定量甲苯、二甲苯等挥发性溶剂是动态溶胀法形成中空聚合物微球的前提;甲苯用量越多,溶胀后形成的中空结构越明显,孔径越大;选择低溶解性的二甲苯溶剂更有利于中空结构的形成.%Hollow polymer microspheres about 5 μm in diameter were synthesized by dynamic swelling method using micron-sized polystyrene spheres with positive charges on surfaces as seeds. The synthesis process included swelling by organic solvents such as toluene and divinylbenzene, polymerizing and coating. The influences of variety and dosage of organic solvents on diameter, size distribution and hole structure of hollow microspheres were investigated, and the formation mechanism of hollow microspheres was discussed. It is indicated that some volatile organic solvents, such as toluene and dimethylbenzene, are crucial to hollow structure formation. Experimental results show that, more toluene leads to larger hollow structure after swelling, and dimethylbenzene is good for hollow structure formation, owing to its low solubility.

  13. Separation of Methano1-Toluene by Extractive Distillation%萃取精馏分离甲醇-甲苯共沸物的研究

    张鸾; 张锦威; 朱宏吉; 白鹏; 李博; 孙畅


    1,2-dimethylbenzene was chosen as solvent through UNIFAC group contribution method and its effect was verified by vapor-liquid equilibrium experiment.The effectiveness of the selected solvent was investigated by batch extractive distillation experiment.The results show that 1,2-dimethylbenzene can increase the relative volatility significantly.The batch extractive distillation was carried out in a packed column of 30 theoretical plates.With the constant reflux ratio of 3 and the solvent mole ratio of 1:1,the product mole fraction of methanol reaches 99.688%.%利用UNIFAC基团贡献法对常用萃取剂进行了筛选,选取邻二甲苯作为该二元共沸物的萃取剂,并通过汽液平衡实验对其分离效果进行了验证;进行甲醇-甲苯分离的间歇萃取精馏实验考察所选萃取剂的效果.结果表明:邻二甲苯能够有效提高甲醇-甲苯的相对挥发度.间歇萃取精馏塔塔板数为30,溶剂比为1,恒回流比(R=3)操作下塔顶得到摩尔分数为99.688%的甲醇产品.

  14. Degradation of vehicle pollutants by nano-titania photocatalyst%二氧化钛光触媒净化车内空气的应用研究

    冯连荣; 许雪峰; 刘守清


    将纳米二氧化钛应用于客车车厢内有机毒物的分解。研究表明,在紫外光照射下,纳米二氧化钛对车内主要有机污染物甲苯、二甲苯、甲醛和总有机挥发物的降解率分别达到93.8%、91.6%、64.8%和88.3%。参照国家室内空气质量标准,在对车内空气污染物进行了治理后,甲苯、二甲苯和总有机挥发物分别达到了国家标准,甲醛的含量也大幅度下降。数据表明,光催化法可以用作车内空气污染的治理。%This paper studies the degradation of organic pollutants in vehicles by the nano-titania photocatalyst. The results show that the photocatalyst can effectively decompose the pollutants in vehicles under ultraviolet light. The degradation ratios of toluene, dimethylbenzene, formaldehyde and the total value of organic compounds are 93.8% ,91.6% ,64.8% and 88.3% respectively. After the photocatalysis is conducted,the content of toluene, dimethylbenzene and the total value of organic compounds in vehicle is lower than the safe values by the state standard of indoor healthy air quality. The amount of formaldehyde also decreases obviously after the photocatalysis. Thus, the photocatalysis can be used to degrade organic pollutants in vehicles.

  15. Study of Solid Phase Grafting of MAH onto PE-UHMW%超高分子量聚乙烯固相接枝马来酸酐的研究

    周开源; 董淑强; 钱天语; 刘杰; 刘春林


    In order to connect the polar groups on the ultra-high molecular weight polyethylene(PE-UHMW) macromolecular chains,maleic anhydride (MAH) was grafted on PE-UHMW by solid phase grafting method using dimethylbenzene as the interfacial agent,benzoyl peroxide(BPO) as the initiator. The grafted product was characterized by FTIR,acid-base titration methods. The effects of the amount of interfacial agent,initiator,monomer,reaction temperature and time on the grafting degree were investigated in detail. The results show that when the amount of dimethylbenzene,BPO and MAH are 10,1.2 and 3 phr respectively,the grafting degree attain to 1.54%after carrying the reaction for 4 h at 100℃.%为了在超高分子量聚乙烯(PE-UHMW)大分子链上引入极性基团,采用固相接枝法制备PE-UHMW接枝马来酸酐(MAH)(PE-UHMW-g-MAH),以二甲苯、十氢萘和白油为界面剂,过氧化苯甲酰(BPO)为引发剂,用接枝单体MAH对PE-UHMW进行接枝改性。通过傅立叶变换红外光谱(FTIR)、酸碱滴定等测试方法对PE-UHMW-g-MAH进行表征。讨论了界面剂种类及用量、引发剂及接枝单体用量、反应时间、反应温度等因素对反应接枝率的影响。最终选用二甲苯作为界面剂。由FTIR可知,MAH已接枝到PE-UHMW分子链上;当二甲苯、BPO和MAH用量分别为10,1.2,3份,反应温度为100℃,反应时间为4 h时,PE-UHMW-g-MAH的接枝率可达1.54%。

  16. 2D→3D polycatenated and 3D→3D interpenetrated metal–organic frameworks constructed from thiophene-2,5-dicarboxylate and rigid bis(imidazole) ligands

    Erer, Hakan [Department of Chemistry, Faculty of Arts and Sciences, Eskişehir Osmangazi University, 26480 Eskişehir (Turkey); Yeşilel, Okan Zafer, E-mail: [Department of Chemistry, Faculty of Arts and Sciences, Eskişehir Osmangazi University, 26480 Eskişehir (Turkey); Arıcı, Mürsel [Department of Chemistry, Faculty of Arts and Sciences, Eskişehir Osmangazi University, 26480 Eskişehir (Turkey); Keskin, Seda [Department of Chemical and Biological Engineering, Koç University, İstanbul (Turkey); Büyükgüngör, Orhan [Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, 55139 Samsun (Turkey)


    Hydrothermal reactions of rigid 1,4-bis(imidazol-1-yl)benzene (dib) and 1,4-bis(imidazol-1-yl)-2,5-dimethylbenzene (dimb) with deprotonated thiophene-2,5-dicarboxylic acid (H{sub 2}tdc) in the presence of Zn(II) and Cd(II) salts in H{sub 2}O produced three new metal–organic frameworks, namely, [Zn(µ-tdc)(H{sub 2}O)(µ-dib)]{sub n} (1), [Cd(µ-tdc)(H{sub 2}O)(µ-dib)]{sub n} (2), and ([Cd{sub 2}(µ{sub 3}-tdc){sub 2}(µ-dimb){sub 2}]·(H{sub 2}O)){sub n}(3). These MOFs were characterized by FT-IR spectroscopy, elemental, thermal (TG, DTA, DTG and DSC), and single-crystal X-ray diffraction analyses. Isomorphous complexes 1 and 2 reveal polycatenated 2D+2D→3D framework based on an undulated (4,4)-sql layer. Complex 3 exhibits a new 4-fold interpenetrating 3D framework with the point symbol of 6{sup 6}. Molecular simulations were used to assess the potentials of the complexes for H{sub 2} storage application. Moreover, these coordination polymers exhibit blue fluorescent emission bands in the solid state at room temperature. - Graphical abstract: In this study, hydrothermal reactions of rigid 1,4-bis(imidazol-1-yl)benzene (dib) and 1,4-bis(imidazol-1-yl)-2,5-dimethylbenzene (dimb) with deprotonated thiophene-2,5-dicarboxylic acid (H{sub 2}tdc) in the presence of Zn(II) and Cd(II) salts in H{sub 2}O produced three new metal–organic frameworks. Isomorphous complexes 1 and 2 reveal polycatenated 2D+2D→3D framework based on an undulated (4,4)-sql layer. Complex 3 exhibits a new 4-fold interpenetrating 3D framework with the point symbol of 6{sup 6}. Molecular simulations were used to assess the potentials of the complexes for H{sub 2} storage application. These coordination polymers exhibit blue fluorescent emission bands in the solid state at room temperature. Display Omitted - Highlights: • Complexes 1 and 2 display polycatenated 2D+2D→3D framework. • Complex 3 exhibits a new 4-fold interpenetrating 3D framework. • Complex 1 adsorbs the highest amount of

  17. 面包酵母催化不对称还原EOPB反应中的溶剂效应%Effect of organic solvents on asymmetric reduction of ethyl-2-oxo-4-phenylbutyrate mediated by saccharomyces cerevisiae

    石玉刚; 励建荣; 唐琼


    The asymmetric reduction of ethyl-2-oxo-4-phenylbutyrate (EOPB) catalyzed by saccharomyces cerevisiae in organic phase to synthesize chiral ethyl-2-hydroxy-4-phenylbutyrate (EHPB) was investigated. In diethyl ether with the initial EOPB concentration of 6 mmol·L-1 , the e. e.(R)-EHPB was increased 19% by using wet baker's yeast (WB) as biocatalyst compared to that by dry baker's yeast (DB). However, the catalytic activity and stability of WB was lower than that of DB. The enantioselectivity of the reduction to produce (R) -EHPB was reduced with the increase of the log P value (0.82-3.2 ) of employed organic solvents. Although dimethylbenzene and cyclohexane had the same log p value (3.2), the enantioselectivity of the reduction was reversed from R to S when dimethylbenzene was in place of cyclohexane as reaction media. Significant changes were observed in the UV absorption and fluorescence spectrum of the YADH from the yeast pretreated by the solvents. These facts indicated that the synergistic effect of solvent polarity and its spatial structure led to the change of the catalytic behavior of baker's yeast%研究了非水介质中面包酵母催化不对称还原2-氧代-4-苯基丁酸乙酯(EOPB)合成手性2-羟基-4-苯36基丁酸乙酯(EHPB)的反应.乙醚体系中湿酵母(WB)催化6mmol·L-1EOPB合成(R)-EHPB的e.e.值较之于干酵母(DB)提高了近19%,但WB稳定性较差.DB催化该反应的立体选择性随溶剂logP(0.82-3.2)的增加而降低,反应从相同logP值(3.2)的二甲苯转换至环己烷后产物构型由R转为S,经有机溶剂预处理后酵母醇脱氢酶(YADH)的紫外及荧光光谱的特征变化表明溶剂分子极性与结构的协同作用下酵母催化行为发生了改变.

  18. Biodegradability enhancement of purified terephthalic acid wastewater by coagulation-flocculation process as pretreatment.

    Karthik, Manikavasagam; Dafale, Nishant; Pathe, Pradyumna; Nandy, Tapas


    In this work, the coagulation-flocculation process was used as pretreatment for purified terephthalic acid (PTA) wastewater with the objective of improving its overall biodegradability. PTA production generates wastewaters with toxicants p-xylene [1,4-dimethyl-benzene (C8H10)], a major raw material used in the production process, along with some of the intermediates, viz., p-toluic acid, benzoic acid, 4-carboxybenzaldehyde, phthalic acid and terephthalic acid. These compounds affect the bio-oxidation process of wastewater treatment; hence removal of these constituents is necessary, prior to conventional aerobic treatment. This paper addresses the application of coagulation-flocculation process using chemical coagulants, viz., aluminium sulphate (alum), polyaluminium chloride (PAC), ferrous sulphate and ferric chloride in combination with anionic polyelectrolyte. Polyaluminium chloride (PAC) in conjunction with lime and polyelectrolyte removed about 63.1% chemical oxygen demand (COD) and 45.2% biochemical oxygen demand (BOD) from PTA wastewater. Coagulation-flocculation process coupled with aerobic bio-oxidation treatment of PTA wastewater achieved, COD & BOD removals of 97.4% and 99.4%, respectively. The biodegradability enhancement evaluated in terms of the BOD5/COD ratio, increased from 0.45 to 0.67 at the optimum conditions. The results obtained from these studies indicate that the coagulation-flocculation process could be a suitable pretreatment method in reducing toxicity of PTA wastewater whilst enhancing biodegradability for aerobic biological treatment scheme.

  19. Vibrational and vibrational-torsional interactions in the 0-600 cm-1 region of the S1 ← S0 spectrum of p-xylene investigated with resonance-enhanced multiphoton ionization (REMPI) and zero-kinetic-energy (ZEKE) spectroscopy

    Tuttle, William D.; Gardner, Adrian M.; O'Regan, Kieran B.; Malewicz, William; Wright, Timothy G.


    We assign the 0-600 cm-1 region of the S1 ← S0 transition in p-xylene (p-dimethylbenzene) using resonance-enhanced multiphoton ionization (REMPI) and zero-kinetic-energy (ZEKE) spectroscopy. In the 0-350 cm-1 range as well as the intense origin band, there are a number of torsional and vibration-torsion (vibtor) features. The latter are discussed in more detail in Paper I [A. M. Gardner et al., J. Chem. Phys. 146, 124308 (2017)]. Here we focus on the origin and the 300-600 cm-1 region, where vibrational bands and some vibtor activity are observed. From the origin ZEKE spectrum, we derive the ionization energy of p-xylene as 68200 ± 5 cm-1. The assignment of the REMPI spectrum is based on the activity observed in the ZEKE spectra coupled with knowledge of the vibrational wavenumbers obtained from quantum chemical calculations. We assign several isolated vibrations and a complex Fermi resonance that is found to comprise contributions from both vibrations and vibtor levels, and we examine this via a two-dimensional ZEKE spectrum. A number of the vibrational features in the REMPI and ZEKE spectra of p-xylene that have been reported previously are reassigned and now largely consist of totally symmetric contributions. We briefly discuss the appearance of non-Franck-Condon allowed transitions. Finally, we find remarkably similar spectral activity to that in the related disubstituted benzenes, para-difluorobenzene, and para-fluorotoluene.

  20. Analysis of the Waste of Paint Spraying and its Treatment%浅谈喷漆的主要污染物及处理措施

    彭园花; 杨波


    Paint spraying produced a lot of waste gas and solid wastes. Waste gas included dimethylbenzene, methylbenzene, non -methane hydrocarbon and particulate matter. Solid wastes were hazardous waste, including paint waste and exhaust gas purifying system waste. The sourse of waste gas and solid wastes was analyzed, and the countermeasures were puts forward.%喷漆产生的主要污染为大气污染和固体废物污染。其中大气污染物主要为二甲苯、甲苯、非甲烷总烃等有机物和颗粒物等。固体废物均为危险废物,包括油漆废物和废气净化系统废物。本文分析了喷漆工艺产生的废气和固体废物的主要来源,并提出了防治喷漆车间污染的对策。

  1. 2D→3D polycatenated and 3D→3D interpenetrated metal-organic frameworks constructed from thiophene-2,5-dicarboxylate and rigid bis(imidazole) ligands

    Erer, Hakan; Yeşilel, Okan Zafer; Arıcı, Mürsel; Keskin, Seda; Büyükgüngör, Orhan


    Hydrothermal reactions of rigid 1,4-bis(imidazol-1-yl)benzene (dib) and 1,4-bis(imidazol-1-yl)-2,5-dimethylbenzene (dimb) with deprotonated thiophene-2,5-dicarboxylic acid (H2tdc) in the presence of Zn(II) and Cd(II) salts in H2O produced three new metal-organic frameworks, namely, [Zn(μ-tdc)(H2O)(μ-dib)]n (1), [Cd(μ-tdc)(H2O)(μ-dib)]n (2), and {[Cd2(μ3-tdc)2(μ-dimb)2]·(H2O)}n(3). These MOFs were characterized by FT-IR spectroscopy, elemental, thermal (TG, DTA, DTG and DSC), and single-crystal X-ray diffraction analyses. Isomorphous complexes 1 and 2 reveal polycatenated 2D+2D→3D framework based on an undulated (4,4)-sql layer. Complex 3 exhibits a new 4-fold interpenetrating 3D framework with the point symbol of 66. Molecular simulations were used to assess the potentials of the complexes for H2 storage application. Moreover, these coordination polymers exhibit blue fluorescent emission bands in the solid state at room temperature.

  2. Four coordination polymers based on 5-tert-butyl isophthalic acid and rigid bis(imidazol-1yl)benzene linkers: Synthesis, luminescence detection of acetone and optical properties

    Arıcı, Mürsel; Zafer Yeşilel, Okan; Büyükgüngör, Orhan


    Four coordination polymers including, [Co(μ-Htbip)2(μ-dib)]n (1), [Co(μ-tbip)(μ-dmib)0.5]n (2), [Zn2(μ-tbip)(μ3-tbip)(μ-dmib)1.5]n (3) and [Cd(μ3-tbip)(μ-dib)0.5 (H2O)]n (4) (tbip: 5-tert-butylisophthalate, dib: 1,4-bis(imidazol-1yl)benzene, dmib: 1,4-bis(imidazol-1yl)-2,5-dimethylbenzene), were hydrothermally synthesized and characterized by elemental analysis, IR spectra, single crystal and powder X-ray diffraction and thermal analysis (TG/DTA). The structural diversity is observed depending on ligands and coordination number of metal centers in the synthesized complexes. The tbip ligand displayed five different coordination modes in its complexes. In 1 and 2, complex 1 is 3D framework with the dia topology while complex 2 has 2D structure with the sql topology depending on coordination geometries of Co ions. Complex 3 is 3D framework with the fsh 4,6-conn topology and complex 4 has 2D 4-connected sql topology. Photoluminescent properties of complex 3 dispersed in various organic solvents were investigated and the results showed that 3 dispersed in methanol could be used as a fluorescent sensor for the detection of acetone. Moreover, thermal and optical properties of the complexes were also studied.

  3. Characterization and Crystal Structures of Two Copper(Ⅱ) Complexes Constructed by a Flexible Double Betaine Ligand

    JIANG Ning-Yi; LI Song-Lin


    A flexible double betaine 1,4-bis(pyridinil-4-carboxylato)-1,4-dimethylbenzene L has been used to generate two Cu(Ⅱ)-containing metal complexes that exhibit different polymeric structures: [Cu(H2O)2 L]·2NO3 1 and [Cu(H2O)3 L]·2Cl·H2O 2. The crystal structures of 1 and 2have been determined by single-crystal X-ray diffraction method. Crystal data for 1: triclinic, space group P1-, a = 5.253(2), b = 7.406(3), c = 14.792(5) (A), α = 84.195(5), β = 80.014(5), γ =78.053(5)°, V = 553.2(3) (A)3, Z = 1, F(000) = 293, Dc = 1.717 g/cm3, the final R = 0.0385 and wR =0.1079 for 1883 observed reflections (I> 2σ(Ⅰ)); and those for 2: monoclinic, space group P21/c, a =10.222(3), b = 25.287(7), c = 9.277(3) (A),β = 93.572(5)°, V = 2393.2(12) (A)3, Z = 4, F(000) = 1140,Dc = 1.540 g/cm3, the final R = 0.0472 and wR = 0.0956 for 3204 observed reflections (I >2σ(Ⅰ)).

  4. [The antalgic and antiphiogistic function and mechanism of RGDT plaster].

    Liu, Xiao-Xia; Wang, Zhi-wang; Chien, Xiao-pin; Liu, Cai-min; Tuo, Hai-yan


    To study the antalgic and antiphlogistic functions and mechanism of ronggudingtong (RGDT) plaster (traditional Chinese medicine). The painful models were established with hot plate test or acetic acid writhing and the inflammatory models were established with daubing dimethylbenzene on auricle or injecting formaldehyde in toe or synovial envelope to study the antalgic and antiphlogistic functions of RGDT Plaster. The total protein and leukotriene B4(LTB4) in inflammatory exudate were detected to investigate the antalgic and antiphlogistic mechanism of RGDT plaster. The mice were randomly divided into different groups (n = 11), on the basis of drug using, the indexes of pain threshold, swelling degree were observed. Sixty-six mice were used to establish gasbag synovitis model and randomly divided into normal control group,model control group, positive control group (Voltaren gel 0.8 mg/d)and low/medium/high dosage RGDT plaster treating groups(30 mg/d, 60 mg/d, 120 mg/d). 30 mg/d, 60 mg/d,120 mg/d RGDT plaster could upgrade the pain thresholds, remit auricular and foot swelling (P plaster has some antalgic and antiphlogistic functions, and one of the mechanisms is depressing synthesis of LTB4.

  5. The Comparative Study on the Rapid Decolorization of Azo, Anthraquinone and Triphenylmethane Dyes by Anaerobic Sludge

    Daizong Cui


    Full Text Available An anaerobic sludge (AS, capable of decolorizing a variety of synthetic dyes, was acclimated and is reported here. The sludge presented a much better dye decolorizing ability than that of different individual strains. A broad spectrum of dyes could be decolorized by the sludge. Continuous decolorization tests showed that the sludge exhibited the ability to decolorize repeated additions of dye. The chemical oxygen demand (COD removal rate of the dye wastewater reached 52% after 12 h of incubation. Polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE profiles revealed that the microbial community changed as a result of varying initial concentrations of dyes. Phylogenetic analysis indicated that microbial populations in the sludge belonged to the phyla Acidobacteria, Firmicutes, Bacteroidetes, Chloroflexi and Proteobacteria. The degradation products of the three types of dye were identified. For azo dyes, the anaerobic sludge converted Methyl Orange to N,N-dimethylbenzene-1,4-diamine and 4-aminobenzenesulfonic acid; for triphenylmethane dyes, after Malachite Green was decolorized, the analyzed products were found to be a mixture of N,N-dimethylbenzenamine, 3-dimethyl-aminophenol and 4-dimethylaminobenzophenone; for anthraquinone dyes, two products (acetophenone and 2-methylbenzoic acid were observed after Reactive Blue 19 decolorization. Together, these results suggest that the anaerobic sludge has promising potential for use in the treatment of industrial wastewater containing various types of dyes.

  6. Desulfurization of petroleum induced by ionization radiation: benzothiophene behavior

    Andrade, Luana S.; Calvo, Wilson A.P.; Duarte, Celina L., E-mail:, E-mail:, E-mail: [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)


    Hydrodesulfurization (HDS) is currently the most common method used by refineries; this removes significantly sulfur compounds from petroleum fractions, however, is not highly effective for removing thiophene compounds such as benzothiophene, and generates high costs for the oil industry. Another factor, are the environmental laws, which over the years has become increasingly strict, especially regarding the sulfur content. This compound cause incalculable damage both to the industry and to the environment. Therefore new methods for petroleum desulfurization should be studied in order to minimize the impacts that these compounds cause. In the present study it was used ionizing radiation, a promising method of advanced oxidation in reducing sulfur compounds. The analysis were performed after purge and trap concentration of samples, followed by gas chromatography-mass spectrometry (GC-MS). Then benzothiophene samples with the same concentration from 27 mg.L{sup -1} to 139 mg.L{sup -1} were irradiated with different absorbed doses of radiation ranging from 1 kGy to 20 kGy in gamma irradiator Cobalt-60, Gammacell. These samples were analyzed by the same procedure used for the calibration curve, and the removals of benzothiophene after ionizing radiation treatment were calculated. It was observed that at higher doses there was a greater degradation of this compound and the formation of fragments, such as 1,2-dimethylbenzene and toluene, which may be removed by simple processes. (author)

  7. Pyrolysis of waste plastic crusts of televisions.

    Liu, Xinmin; Wang, Zhen; Xu, Dongyan; Guo, Qingjie


    The disposal of waste plastic crusts of televisions is an issue that is gaining increasing interest around the world. In this investigation, the pyrolysis and catalytic cracking of the waste television crusts mainly composed of acrylonitrile--butadiene-styrene copolymer was studied. Thermogravimetric analysis was used for initial characterization of the pyrolysis of the waste plastic, but most of the investigations were carried out using a 600 mL tubing reactor. Effects of temperature, reaction time and catalyst on the pyrolysis of the waste television crusts were investigated. The results showed that the oil yield increased with increasing temperature or with prolongation of reaction time. With increasing temperature, the generating percentage of gasoline and diesel oil increased, but the heavy oil yield decreased. Zinc oxide, iron oxide and fluid catalytic cracking catalyst (FCC catalyst) were employed to perform a series of experiments. It was demonstrated that the liquid product was markedly improved and the reaction temperature decreased 100 degrees C when FCC was used. The composition ofpyrolysis oils was analysed using gas chromatography-mass spectrometry, and they contained 36.49% styrene, 19.72% benzenebutanenitrile, 12.1% alpha-methylstyrene and 9.69% dimethylbenzene.

  8. Molecular symmetry group analysis of the low-wavenumber torsions and vibration-torsions in the S1 state and ground state cation of p-xylene: An investigation using resonance-enhanced multiphoton ionization (REMPI) and zero-kinetic-energy (ZEKE) spectroscopy

    Gardner, Adrian M.; Tuttle, William D.; Groner, Peter; Wright, Timothy G.


    For the first time, a molecular symmetry group (MSG) analysis has been undertaken in the investigation of the electronic spectroscopy of p-xylene (p-dimethylbenzene). Torsional and vibration-torsional (vibtor) levels in the S1 state and ground state of the cation of p-xylene are investigated using resonance-enhanced multiphoton ionization (REMPI) and zero-kinetic-energy (ZEKE) spectroscopy. In the present work, we concentrate on the 0-350 cm-1 region, where there are a number of torsional and vibtor bands and we discuss the assignment of this region. In Paper II [W. D. Tuttle et al., J. Chem. Phys. 146, 124309 (2017)], we examine the 350-600 cm-1 region where vibtor levels are observed as part of a Fermi resonance. The similarity of much of the observed spectral activity to that in the related substituted benzenes, toluene and para-fluorotoluene, is striking, despite the different symmetries. The discussion necessitates a consideration of the MSG of p-xylene, which has been designated G72, but we shall also designate [{3,3}]D2h and we include the symmetry operations, character table, and direct product table for this. We also discuss the symmetries of the internal rotor (torsional) levels and the selection rules for the particular electronic transition of p-xylene investigated here.

  9. 载人航天器密封舱微量有害气体质谱检测方法%Mass spectrometric detection of harmful trace gases in manned spacecraft capsule

    陈联; 邱家稳; 王丽红; 张晓曦


    Detection of multi -component harmful trace gases in manned spacecraft capsule by miniature vacuum mass spectrometer was introduced. Online monitoring of a variety of harmful trace gases in the capsule was realized through detecting the gas concentration. Experimental data of relative sensitivity of some gases such as toluene, dimethylbenzene, dichloromethane, methane and acetone were given and the experiment also verified that the minimum detectable concentration of before -mentioned gases can reach lppm. The results indicated that monitoring of harmful trace gas concentration by miniature vacuum mass spectrometer in manned spacecraft capsule is feasible.%介绍了采用小型真空质谱计进行载人航天器密封舱内多组分微量有害气体的检测方法.通过测量微量气体浓度,实现密封舱内多种微量有害气体在线监测.给出了甲苯、二甲苯、二氯甲烷、甲烷、丙酮等5种气体的相对灵敏度试验数据,验证了现有小型真空质谱计最小可检浓度可以达到1ppm要求.研究结果表明,采用小型真空质谱计进行舱内微量有害气体浓度监测是可行的.

  10. Role of intermolecular interaction in crystal packing: A competition between halogen bond and electrostatic interaction

    Chen, Peng-Yuan; Zhang, Lin; Zhu, Shun-Guan; Cheng, Guang-Bin


    To investigate the competition between halogen bond and electrostatic interaction and their influence on the crystal packing, four novel solvates of 1,3,5-trichloro-2,4,6-trinitrobenzene (TCTNB) and 1,3,5-tribromo-2,4,6-trinitrobenzene (TBTNB) were synthesized while the intermolecular forces and the contribution of each interaction were analyzed quantitatively. The electrostatic interaction is the main link between TCTNB, TBTNB and 1,4-dioxane respectively, while π-π interaction dominates in these two solvates of TCTNB/1,4-dimethylbenzene (PX) and TCTNB/mesitylene. The solvate interaction changes and varieties were illuminated by Hirshfeld surface analysis, and the group contributions were illustrated respectively. Molecular electrostatic potential surface (MEPs) with density functional theory (DFT) calculation was performed to compare the relative strength of electrostatic interaction and halogen bond. The result shows that MEPs can be used as a descriptor for determining the most possible intermolecular interaction under certain circumstances. The study presented here may provide the guidance for the design and synthesis of the complex with desired properties.

  11. A Comparison of Electron-Transfer Dynamics inIonic Liquids and Neutral Solvents

    Wishart J. F.; Lee, H.Y.; Issa, J.B.; Isied, S.S.; Castner, Jr., E.W.; Pan, Y.; Hussey, C.L.; Lee, K.S.


    The effect of ionic liquids on photoinduced electron-transfer reactions in a donor-bridge-acceptor system is examined for two ionic liquid solvents, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide and tributylmethylammonium bis(trifluoromethylsulfonyl)amide. The results are compared with those for the same system in methanol and acetonitrile solution. Electron-transfer rates were measured using time-resolved fluorescence quenching for the donor-bridge-acceptor system comprising a 1-N,1-N-dimethylbenzene-1,4-diamine donor, a proline bridge, and a coumarin 343 acceptor. The photoinduced electron-transfer processes are in the inverted regime (-{Delta}G > {lambda}) in all four solvents, with driving forces of -1.6 to -1.9 eV and estimated reorganization energies of about 1.0 eV. The observed electron-transfer kinetics have broadly distributed rates that are generally slower in the ionic liquids compared to the neutral solvents, which also have narrower rate distributions. To describe the broad distributions of electron-transfer kinetics, we use two different models: a distribution of exponential lifetimes and a discrete sum of exponential lifetimes. Analysis of the donor-acceptor electronic coupling shows that for ionic liquids this intramolecular electron-transfer reaction should be treated using a solvent-controlled electron-transfer model.

  12. 右酮洛芬对实验动物的解热镇痛和抗炎作用%Antipyretic, analgesic and antiinflammatory actions of dexketoprofen in experimental animal

    张运芳; 李俊; 金涌; 徐叔云


    AIM: To study the antipyretic, analgesic and antiinflammatory actions of dexketoprofen. METHODS: Hot-plate and tail-flick models in mice, fever model in rats and rabbits induced by carrageenin or typhoid vaccine respectively, ear swelling induced by dimethylbenzene in mice; foot pad swellings induced by carrageenin and granuloma induced by cotton in rats were adopted. RESULTS: Dexketoprofen (7.5,15,30 mg*kg-1) could significantly prolong latency of analgesic in hot-plate and tail-flick models in mice and reduce carrageenin-induced fever in rats, and inhibit dimethylbenzene-induced ear swelling in mice. Dexketoprofen (1.9,3.8,7.5 mg*kg-1) could significantly inhibit typhoid vaccine-induced fever in rabbits; Dexketoprofen (3.8,7.5,15 mgkg-1) could also significantly inhibit the swelling of foot pad induced by carrageenin, and the granuloma induced by cotton in rats. CONCLUSION: Dexketoprofen has antipyretic, analgetic and antiinflammatory effect.%目的:研究右酮洛芬的解热镇痛和抗炎作用。方法:采用小鼠热板法和热辐射甩尾法;角叉菜胶诱导的大鼠和伤寒疫苗诱导的兔体温升高;二甲苯诱导的小鼠耳水肿,大鼠角叉菜胶诱导的足肿胀和大鼠棉球肉芽肿胀实验模型。结果:右酮洛芬(7.5,15,30 mg*kg-1)能明显延长小鼠热板和热辐射甩尾的痛阈时间;右酮洛芬(7.5,15,30 mg*kg-1)对角叉菜胶诱导的大鼠体温升高,右酮洛芬(1.9,3.8,7.5 mg*kg-1)对伤寒疫苗诱导的兔体温升高均有明显的降温作用;右酮洛芬(7.5,15,30 mgkg-1)对二甲苯诱导的小鼠耳水肿有显著的抑制作用;右酮洛芬(3.8,7.5,15 mgkg-1)对大鼠角叉菜胶引起的足肿胀及棉球诱导的大鼠肉芽肿均有显著的抑制作用。结论:实验结果表明,右酮洛芬具有良好的解热镇痛和抗炎作用。

  13. Study on Screening Valid Target of Anti -inflammatory and Analgesic Effets of Calystegia Soldanella%孝扇草抗炎镇痛有效部位的筛选研究

    谭丽; 沈清; 黄真


    Objective: To separate and screen the valid target of anti - inflammatory and analgesic effects of Calystegia soldanella . Methods: Systematic solvent method is used to separate the ethanol extract of Calystegia soldanella ,ear edema induced by dimethylbenzene in mice was used to screen the valid target of the anti - inflammatory effects,mice hot -plate procedures and mice wthithing induced by acetic acid were used to screen the valid target of the analgesic effects. Results :The inhibition ratio of swelling induced by dimethylbenzene in mice of the ethanol - extracted acetoacetate - abstraction group of Calystegia soldanella is 50.53% (P < 0.05). The acetoacetate - abstraction group and the rest group could significantly prolong the mouse hot - plate - induced pain of the pain threshold of the mice( P <0.05 ,P <0.05). The ethanol - extracted acetoacetate - abstraction group and the n - buOH - abstraction group can significantly decrease ? acetic acid -induced writhing response in mice(P < 0.05, P < 0.05). Conclusion-.The ethanol -extracted acetoacetate -abstraction group of Calystegia soldanella is most propably the valid target of anti - inflammatory and analgesic.%目的:分离并筛选孝扇草抗炎镇痛作用的有效部位.方法:采用系统溶剂法对孝扇草醇提物进行初步分离;采用二甲苯致小鼠耳廓肿胀实验,筛选孝扇草抗炎作用有效部位;采用热板法和醋酸致小鼠扭体法实验,筛选其镇痛作用有效部位.结果:孝扇草醇提乙酸乙酯萃取部位对二甲苯致小鼠耳廓肿胀的抑制率为50.53%,与空白对照组比较有显著性差异(P<0.05);孝扇草醇提乙酸乙酯萃取部位和各溶剂萃取剩余部位均能显著提高小鼠痛阈值,与空白对照组比较有显著性差异(P <0.05,P<0.05);孝扇草醇提乙酸乙酯和正丁醇萃取部位均能明显减少醋酸致小鼠扭体反应次数,与空白组比较有显著性差异(P<0.05,P<0.05).结论:孝扇草醇提

  14. Study on Tibetan Medicine Toothpaste Formula Technology and Its Anti-Inflammatory Effect%藏药牙膏配方工艺与抗炎作用研究

    许凉凉; 伊辛; 尹雪雁; 魏文浩; 蔡程科


    Objective:To investigate and determine the best formula of Tibetan medicine toothpaste and study the anti-inflammato-ry effects.Methods:Tibetan medicine were added as functional component.The effects of toothpaste forming process was measured by sensory property to evaluate the different ratio of glycerol,Silicon dioxide and non-ionic guar gum.Ear swelling was induced by dimethylbenzene in mice.Tibetan medicine toothpate was daubed on the ears of mice,then,the ear swelling volume was measured to analyze the anti-inflammatory effects of Tibetan medicine toothpaste.Results:The best formula was made of 3.3 g of Tibetan medi-cine,25 g of glycerin,40 g of sorbitol with the 70% concertration,22 g of Silicon dioxide,0.7g of non-ionic guar gum,1 .1 g of oleummenthae,2.2 g of sodium dodecyl sulfate(K1 2),0.1 g of ethylparaben,0.05 g of propylparaben,0.35 g of saccharinand as well as proper weight of water.The Tibetan medicine toothpaste markedly suppressed the ear swelling induced by dimethylbenzene, and in contrast to Yunnan Baiyao toothpaste,the anti-inflammatory effects of Tibetan medicine toothpaste was better.Conclusion:The Tibetan medicine toothpaste is smooth and bright having a gentle mint taste,and its color is translucence dark brown and the viscosity is moderate.The Tibetan medicine toothpaste has good anti-inflammatory effect.%目的:研究确定藏药牙膏最佳配方并进行抗炎药效研究。方法:以藏药诃子、白矾、寒水石等为添加功效成分,考察不同配比的甘油、二氧化硅、非离子瓜尔胶对牙膏感官性状的影响,并采用二甲苯致小鼠耳肿胀模型,考察研究制备的藏药牙膏的抗炎药效作用,计算肿胀度和抑制率,分析藏药牙膏对炎症的抑制作用。结果:最佳配方为藏药3.3 g、甘油25 g、70%山梨醇40 g、二氧化硅22 g、非离子瓜尔胶0.7 g、薄荷油1.1 g、十二烷基硫酸钠(K12)2.2 g、尼泊金乙酯0.1 g、尼泊金丙酯0.05 g、糖精0

  15. Preparation and investigation of nano-AlN lubricant with high performance

    Tao, Yu; Tao, Yuxiao; Wang, Biaobing [School of Materials Science and Engineering, Changzhou University, Changzhou 201326 (China); Tai, Yanlong, E-mail: [Department of Biomedical Engineering, University of California Davis, Davis, CA 95616 (United States)


    A new kind of macromolecular coupling agent (LMW-a-PP-g-MAH) of maleic anhydride (MAH) onto low-molecular-weight atactic polypropylene (LMW-a-PP) was synthesized according to molecular design and was used as modifier for surface modification of nano-Aluminum nitride (AlN) by a high-pressure homogenization (HPH) process. IR was conducted to confirm the chemical structure of the step products of LMW-a-PP-g-MAH. The availability as a modifier for surface modification of nano-AlN was distinguished by Fourier transform infrared spectroscopy (FTIR), particle size analysis, transmission electron microscope (TEM), thermogravimetric analysis (TGA), contact angle experiments and the dispersion stability in dimethylbenzene and Greatwall lubrication oil. It can be inferred that the optimal loading is 10 wt. %–12 wt. % of LMW-a-PP-g-MAH to modify nano-AlN particles. Nano-AlN lubricating composite materials (LMW-a-PP-g-MAH-AlN) was used to improve the antifriction performance and the load capability of Greatwall lubrication oil, and maximum non-seizure load (P{sub B}) can increase highly from 1000 N to 1490 N when the loading is 0.3 wt. %. - Highlights: • Design and synthesis of macromolecular coupling agent (a-PP-g-MAH). • Surface modification and characterization of nano-AlN by HPH process. • Preparation and investigation of nano-AlN/lubricating oil with high performance.

  16. Mixed organic solvents induce renal injury in rats.

    Weisong Qin

    Full Text Available To investigate the injury effects of organic solvents on kidney, an animal model of Sprague-Dawley (SD rats treated with mixed organic solvents via inhalation was generated and characterized. The mixed organic solvents consisted of gasoline, dimethylbenzene and formaldehyde (GDF in the ratio of 2:2:1, and were used at 12,000 PPM to treat the rats twice a day, each for 3 hours. Proteinuria appeared in the rats after exposure for 5-6 weeks. The incidences of proteinuria in male and female rats after exposure for 12 weeks were 43.8% (7/16 and 25% (4/16, respectively. Urinary N-Acetyl-β-(D-Glucosaminidase (NAG activity was increased significantly after exposure for 4 weeks. Histological examination revealed remarkable injuries in the proximal renal tubules, including tubular epithelial cell detachment, cloud swelling and vacuole formation in the proximal tubular cells, as well as proliferation of parietal epithelium and tubular reflux in glomeruli. Ultrastructural examination found that brush border and cytoplasm of tubular epithelial cell were dropped, that tubular epithelial cells were partially disintegrated, and that the mitochondria of tubular epithelial cells were degenerated and lost. In addition to tubular lesions, glomerular damages were also observed, including segmental foot process fusion and loss of foot process covering on glomerular basement membrane (GBM. Immunofluorescence staining indicated that the expression of nephrin and podocin were both decreased after exposure of GDF. In contrast, increased expression of desmin, a marker of podocyte injury, was found in some areas of a glomerulus. TUNEL staining showed that GDF induced apoptosis in tubular cells and glomerular cells. These studies demonstrate that GDF can induce both severe proximal tubular damage and podocyte injury in rats, and the tubular lesions appear earlier than that of glomeruli.

  17. 沉香种子超临界CO2萃取物的气相色谱-质谱联用分析%Analysis of Constituents in Supercritical Fluid CO2 Extraction in Aquilariae Lignum Resinatum Fruits by GC-MS

    李勇; 蒋海强; 巩丽丽


    Objective: To investigate the chemical compositions from Aquilariae Lignum Resinatum fruits. Method: The chemical structures of products were identified by supercritical fluid CO2 extraction ( GC-MS) , combined with NIST database queries. Result: By GC-MS, 24 compounds can be identified, the content of ethyl palmitate is the highest up to 28.26%, and 4-methyl-l(-1 , 5-dimethyl)-benzene is 10.22%, methyl hexadecanoate is 8.09% and camphene is 7.26%. Conclusion: The extraction of essential oil from Aquilariae Lignum Resinatum fruits by supercritical fluid C02 extraction (SFE-CO2) is satisfactory.%目的:分析沉香种子的挥发性成分.方法:采用超临界CO2流体萃取技术,提取沉香种子中的挥发性成分,经气相色谱-质谱(GC-MS)分析,结合NIST数据库查询,鉴定化合物结构.结果:经GC-MS分析,分离得到沉香种子中25个化学成分,鉴定了22个,其中棕榈酸乙酯的含量最高,为28.26%,4-甲基-1-(1,5-二甲基)-苯含量为10.22%,棕榈酸甲酯的含量为8.09%,莰烯含量为7.26%.结论:超临界CO2萃取法是提取沉香种子提取物较为理想的方法.

  18. Evaluation of long-range transport potential of selected brominated flame retardants with measured 1-octanol-air partition coefficients

    Lee, Hyun Jeong; Kwon, Jung Hwan [Div. of Environmental Science and Ecological Engineering, Korea University, Seoul (Korea, Republic of)


    Various alternative flame retardants are used in many countries since polybrominated diphenyl ethers (PBDEs) were classified as persistent organic pollutants (POPs). However, difficulties in the evaluation of the long-range transport potential (LRTP) of the alternatives are related to the lack of information on their physicochemical properties, which govern their environmental fates and transport. Based on the simulation of LRTP using OECD P{sub OV} and LRTP Screening Tool, five alternative brominated flame retardants (BFRs) (hexabromobenzene [HBB], 2,3,4,5,6-pentabromotoluene [PBT], 2,3,4,5,6-pentabromoethylbenzene [PBEB], 2-ethylhexyl 2,3,4,5-tetrabromobenzoate [TBB], and 1,2,4,5-tetrabromo-3,6-dimethylbenzene [TBX]), and 3 PBDEs (BDE-28, BDE-47, and BDE-99) were chosen to perform a refined assessment. This was done using an experimentally measured 1-octanol–air partition coefficient (K{sub OA}) for the calculation of the air–water partition coefficient (K{sub AW}) required for the model. The four selected alternative BFRs (HBB, PBT, PBEB, TBX) have K{sub OA} values close to the in silico estimation used in the screening evaluation. On the other hand, the measured K{sub OA} value for TBB was two orders of magnitude lower than the estimated value used in the screening simulation. The refined simulation showed that characteristic travel distance (CTD) and transfer efficiency (TE) for HBB, PBT, PBEB, and TBX were greater than those for BDE-28, whereas CTD and TE for TBB were lower than those for BDE-28. This suggested that TBB has a lower LRTP than BDE-28, considering the refined partition coefficients.

  19. 苦瓜霜抗炎作用的研究%Study on the Anti-inflammatory Action of Bitter Melon Cream

    肖春莹; 王志刚; 连红


    目的:研究苦瓜霜的抗炎作用。方法:观察二甲苯致小鼠耳肿胀度;测定角叉菜胶致大鼠足踝关节周长;测定大鼠棉球肉芽肿重量;观察组胺致大鼠毛细血管通透性。结果:苦瓜霜明显抑制二甲苯致小鼠耳肿胀;明显抑制角叉菜胶致大鼠足肿胀;明显抑制大鼠棉球肉芽肿增生;明显抑制组胺致大鼠毛细血管通透性。结论:苦瓜霜具有明显的抗炎作用。%Objective:To study the anti-inflammatory action of bitter melon cream. Methods:To observe the swelling degree of mice ear induced by dimethyl-benzene,determine the circumference of rat ankle joint induced by carrageenin,determine the weight of rat cotton ball granuloma,observe the rat capillary permeability induced by histamine. Results:Bitter melon cream could evidently restraint swelling degree of mice ear induced by dimethylbenzene,could evidently suppress rat ankle joint induced by carrageenin,could evidently inhibit rat cotton ball granuloma,could evidently restraint rat capillary permeability induced by his-tamine. Conclusion:Bitter melon cream has obvious anti-inflammatory action.

  20. Recovery of Sulfur and Silver From Zinc Smelting Residue%从湿法炼锌渣中回收银和硫

    曾斌; 胡良辉; 毛永星; 余攀


    Recovery of silver and sulfur from zinc smelting residue by dimethylbenzene leaching sulfur -roasting-sulfuric acid leaching impurities-cyanide leaching silver process is investigated .T he result show that the leaching rate of sulfur is 96 .40% under the conditions of reaction temperature of 95 ℃ , reaction time of 15 min and the ratio between liquid volume and solid mass of 5 ∶ 1 .The roasting conditions of sulfur leaching residue are adding sodium hydroxide of 1% into the residue ,roasting temperature of 630 ℃ ,roasting time of 2 h .T he conditions of leaching impurities using sulfuric acid are the ratio between of liquid volume and solid mass ,system pH of 1 .0 ,reaction temperature of 95℃ ,reaction time of 3 h .The cyanide leaching silver under the conditions of system pH of 9 .5-11 .5 , the ratio between liquid volume-solid mass of 3∶1 ,sodium cyanide concentration of 2 g/L ,reaction time of 24 h ,the leaching rate of silver is 78 .50% .%研究了用二甲苯浸出-焙烧-硫酸浸出杂质-氰化浸出银工艺从湿法炼锌渣中回收硫和银。试验结果表明:在反应温度95℃、反应时间15 min、液固体积质量比5∶1条件下用二甲苯浸出,硫浸出率为96.40%;分硫渣中加入1%氢氧化钠,在630℃下焙烧2 h ,然后用硫酸浸出锌、铁等杂质,控制液固体积质量比为4∶1,pH为1.0,反应温度为95℃,反应时间为3h;之后对硫酸浸出渣氰化浸出银,体系pH控制在9.5~11.5之间,液固体积质量比为3∶1,氰化钠质量浓度2.0g/L,浸出时间24h,银回收率为78.5%。

  1. 一种从石蜡包埋组织中获取高质量基因组DNA的改良方法%An improved method to recover high quality genomic DNA from paraffin-embedded tissues

    夏米西努尔·伊力克; 杨曦; 武贵臻; 马琦; 阿布力孜·阿布杜拉


    Objective To establish a high quality genomic DNA preparation method from formalin fixed and paraffin embedded tissues (FFPET) by integrating previous DNA extraction methods. Methods We combined classical genomic DNA extraction methods and commercially available DNA affinity column, replaced the de-waxing by dimethylbenzene with water-bath, designed a fast and improved genomic DNA preparation method. We also extracted genomic DNA from paraffin embedded cervical cancer tissues, and checked the quality of DNA by agarose gel electrophoresis and polymerase chain reaction detection. Results The improved genomic DNA extraction method combined the advantages of the water-bath de-waxing and DNA affinity column, making it possible to get high quality genomic DNA from paraffin embedded cervical cancer tissues, and especially efficient to recover genomic DNA fragments larger than 20 kb. Conclusion The improved DNA extraction method is fast and convenient to recover high quality genomic DNA from paraffin embedded tissues.%目的:比较现有的DNA制备方法,建立一种从甲醛固定石蜡包埋组织(formalin-fixed paraffin-embedded tissues,FFPET)提取高质量基因组DNA的方法.方法:将传统基因组DNA提取方法与市场供应的DNA亲和层析柱结合在一起,以水浴脱腊法替代二甲苯脱腊法,设计一种改良的基因组DNA快速提取方法,从石蜡包埋宫颈癌组织标本提取基因组DNA,并用琼脂糖凝胶电泳法和聚合酶链式反应法进行鉴定.结果:改良的基因组DNA提取法整合了水浴脱蜡与DNA亲和层析柱的优点,从石蜡包埋宫颈癌组织中获得了高质量的基因组DNA,特别是能以很高的效率回收大于20 kb的基因组DNA大片段.结论:改良的基因组DNA提取方法简单快捷,是一种从石蜡包埋组织中回收高质量基因组DNA的有效途径.

  2. 吴茱萸不同炮制方法对抗炎镇痛作用的影响研究%Study on Analgesic and Anti - Inflammatory Effects of Different Kinds of Evodia Rutaecarpa (Juss.)Benth.

    杨磊; 黄开颜; 陈兴; 杨晖; 李康; 张志国


    目的 观察吴茱萸不同炮制品的抗炎镇痛作用.方法 采用小鼠热板法和扭体法,观察吴茱萸不同炮制品的镇痛作用;采用耳肿法观察吴茱萸不同炮制品的抗炎作用.结果 吴茱萸不同炮制品能明显提高热板和扭体试验小鼠的痛阈值,其中以砂烫盐炙组作用较强;对二甲苯所致的小鼠耳廓肿胀有明显的抑制作用,其中以砂烫组作用较强.结论 吴茱萸不同炮制品均有显著的抗炎、镇痛作用,其中以砂烫组和砂烫盐炙组作用较强.%Objective To study analgesic and anti - inflammatory effects of different processed products of Evodia rutaecarpa (Juss. ) Benth. Methods The analgesic effect was tested by hot plate method and writhing body method in mice. The anti - inflammatory effect was tested by ear swollen method in mice. Results For the pain caused by hot plate method and writhing body method, the different processed products of Evodia rutaecarpa{Juss. ) Benth. have obviously increased threshold of pain in mice. Among these products, the group of stir - baked in sand with processed salty water shows more intensive effect,which has substantially inhibiting effects on mice s ear swelling caused by dimethylbenzene. The stir - baked in sand is more intensive. Conclusion Different processed products of Evodia rutaecarpa (Juss. ) Benth. have marked analgesic and anti - inflammatory effects, of which the stir - baked in sand one and stir - baked in sand wTith processed salty water one are more intensive.

  3. 碳/碳复合材料的宽温域自愈合抗氧化%Self-Healing Oxidation Resistance of C/C Composite Covering a Broader Temperatures Range



    Mechanism of self-healing oxidation resistance and preparation technique of a kind of carbon fiber reinforced pyrolytic carbon composite (C/C) are suggested in the study. The composite characterized with homogeneous nano-dispersed complex matrix of ZrB2-ZrC-SiC was prepared by polymer impregnanting and pyrolysis (PIP) process, i.e. the nano-dispersed ZrB2-ZrC-SiC composite ceramics were introduced into a porous C/C composites with low density using complex precursors prepared by completely dissolving of ZrB2 , ZrC polymeric precursors and polycarbosilanes in dimethylbenzene solution. Ultra-high temperature ablation tests shown that the linear and mass ablation rate at 2 200 ℃ for the C/ C-ZrB2-ZrC-SiC composites decreased by 85.8% and 71.0% , respectively, in comparison with those of C/C-SiC composites. The very low ablation rates result from the formation of uniformly distributed ZrO2-SiO2 continuous glass coating, which prevented the molecular inner-diffusion of oxygen and thereby protected the carbon phase from being further oxidized.%在前期碳材料自愈合抗氧化研究的基础上,提出了通过多元陶瓷基体改性赋予碳/碳复合材料在较宽温度范围内实现自愈合抗氧化的基本原理和技术方案,分析了B4C—SiC、ZrC—SiC和ZrB2-ZrC—SiC等多元陶瓷的抗氧化机理,并采用新近合成的ZrB2-ZrC—SiC三元复相陶瓷有机前驱体,通过PIP技术制备了一系列超高温复相陶瓷改性的碳/碳复合材料,研究了该类复合材料在2200℃以下高速气流冲蚀环境中的协同抗氧化和抗烧蚀性能,发现材料表面生成的复合氧化物层能够在一定条件下赋予复合材料自愈合抗氧化能力。

  4. 液体农药软包装的研究现状及展望%Current Status and Prospect of Liquid Pesticide Packaging

    李环; 陆佳平


    液体农药因含有毒性较大且腐蚀性较强的甲苯、二甲苯等有机溶剂,其软包装材料应具备较强的耐腐蚀性能和阻隔性能。目前国内市场上液体农药软包装常用的材料主要有PET/Al/CPP(或PE)复合膜、PET/VMPET/CPP(或PE)复合膜、含PA或EVOH的PP,PE多层共挤膜、PET/PVDC(或EVOH)/CPP(或PE)透明复合膜等,常用的胶黏剂为聚氨酯胶黏剂。液体农药包装废弃物的处理一般采取随意丢弃和集中填埋焚烧2种方式,均对环境及人类健康危害较大,必须采取相应的措施以降低其危害。液体农药软包装必须朝绿色环保方向发展,研发并推广可降解材料与水溶性膜。%There exist high toxic and strong corrosive organic solvents such as methylbenzene and dimethylbenzene in liquid pesticide,therefore materials used in packaging pesticide should have strong anti-corrosive and high barrier property.At present,common flexible materials in domestic market mainly include PET/Al/CPP(or PE),PET/VMPET/CPP(or PE) dry laminated films,PP or PE coextrusion film including PA or EVOH and PET/PVDC(or EVOH) /CPP(or PE) transparent film.Meanwhile polyurethane adhesive is often used.Discarding and dumping in landfills and burning are two main ways for waste disposal,which are detrimental to environment and physical health and some appropriate measures should be taken.In future,researching and developing degradable materials and water soluble film is a green and environmental-friendly way to liquid pesticide packaging.

  5. High-performance MgB2 superconducting wires for use under liquid-helium-free conditions fabricated using an internal Mg diffusion process

    Ye, ShuJun; Song, Minghui; Matsumoto, Akiyoshi; Togano, Kazumasa; Takeguchi, Masaki; Ohmura, Takahito; Kumakura, Hiroaki


    MgB2 has a superconducting transition temperature (Tc) of 39 K, which is much higher than that for practical metallic superconductors. Thus, it is hoped that MgB2 can not only replace metallic superconductors, but can be used under liquid-helium-free conditions, for example, at temperatures of 10-20 K that can easily be achieved using cryocooling systems. However, to date, the reported critical current density (Jc) for MgB2 wires is not high enough for large-scale applications in liquid-helium-free conditions. In the present study, successful fabrication of high-performance MgB2 superconducting wires was carried out using an internal Mg diffusion (IMD) process, involving a p-dimethylbenzene (C8H10) pre-treatment of carbon-coated B powder with nanometer-sized particles. The resulting wires exhibited the highest ever Jc of 1.2 × 105 A cm-2 at 4.2 K and 10 T, and an engineering critical current density (Je) of about 1 × 104 A cm-2. Not only in 4.2 K, but also in 10 K, the Jc values for the wires fabricated in the present study are in fact higher than that for Nb-Ti wires at 4.2 K for the magnetic fields at which the measurements were carried out. At 20 K and 5 T, the Jc and Je were about 7.6 × 105 A cm-2 and 5.3 × 103 A cm-2, respectively, which are the highest values reported for MgB2 wires to date. The results of a detailed microstructural analysis suggested that the main reason for the superior electrical performance was the high density of the MgB2 layer rather than just the small grain size, and that the critical current could be further increased by suitable control of the microstructure. These high-performance IMD-processed MgB2 wires are thus promising superconductors for applications such as magnetic resonance imaging and maglev trains that can operate under liquid-helium-free conditions.

  6. 间苯二甲腈在四种溶剂中溶解度的测定及关联%Measurement and Correlation of the Solubility of Isophthalonitrile in Four Solvents

    李玉刚; 孔令启; 马磊; 张道斌; 周波


    采用平衡法分别测定了间苯二甲腈在甲醇、甲苯、二甲苯和苯胺四种溶剂中的溶解度,温度范围为293.15~318.15 K,并分别采用λ-h方程、Apelblat模型和Yaws模型对实验数据进行了关联.根据实验数据可以看出间苯二甲腈的溶解度在4种溶剂中均随着温度的升高而升高,并且间苯二甲腈在不同溶剂中的溶解度差别较大.通过4个体系的24个数据点的实验值与计算值相比较,三种模型的总的平均相对误差分别为5.92%、3.90%、3.86%.结果表明λ-h方程、Apelblat模型和Yaws模型都可以较好地关联间苯二甲腈在四种溶剂中的溶解度数据.%The solubility data of isophthalonitrile (IPN) in methanol, toluene, dimethylbenzene and aniline at 293.15~381.15 K were determined by equilibrium method. The experimental data were correlated with λ-h equation, Apelblat equation and Yaws equation, respectively. According to the experimental data, the solubilities of IPN in above mentioned 4 solvent systems increase with increasing temperature, and they are of great difference in different solvents. Comparing 24 data of IPN solubility in above 4 solvent systems, the average absolute deviations between the experimental values of IPN solubility and those calculated by above three equations are 5.92%, 3.90% and 3.86%, respectively. The results show that all the λ-h equation, Apelblat equation and Yaws equation could well correlate the solubility data of IPN in those 4 mentioned solvents.

  7. 盐酸赛洛唑啉残留溶剂的测定%Determination of Residual Solvent in Xylometazoline Hydrochldride

    张奕恂; 梁素红; 钱伟


    目的:建立适用于盐酸赛洛唑啉原料残留溶剂的检测方法。方法采用气相色谱毛细管柱 DB-624(30m ×250μm ×1.4μm),氢火焰离子化检测器( FID),检测器温度280℃,顶空进样系统,顶空平衡温度80℃,程序升温的方法测定盐酸赛洛唑啉原料中苯、乙醇、乙醚、二甲苯等残留溶剂。结果方法的专属性良好,乙醇,乙醚,苯,对二甲苯的加样回收率均在87.5%~95.2%的范围。结论所建立的方法用于盐酸赛洛唑啉原料溶剂残留的控制和检测,结果准确、可靠,可用于原料药的质量控制。%ABSTRACT:OBJECTIVE To establish a method for determination of residual solvent in xylometazoline hydro-chldride.METHODS A capillary column DB-624 (30m ×250μm ×1.4μm) and a FID were adopted.The injector temperature was 280℃.The headspace temperature was 80℃.Column temperature was increased by programmed control.The residual solvent in xylometazoline hydrochldride were about benzene,ethanol,diethyl ether and dimethyl-benzene.RESULTS The method presented a good specificity.Their average recovery rates were 87.5%~95.2%.CONCLUSION The developed method is suitable for the determination of residual solvent in xylometazoline hydrochldride about benzene,ethanol,diethyl ether and dimethylbenzene.

  8. Effects of Qianlieqing granule on chronic bacterial prostatitis in rats%前列清颗粒的抗炎、镇痛作用

    陈更新; 邓海霞; 陈志强; 何羿婷; 徐琳本


    OBJECTIVE To evaluate the anti-inflammatory and analgesic effects of Qianlieqing granule (QLQG) in animal models. METHODS The rats were divided into five groups: groups of high, middle and low dose of QLQG, indometacin control group and blank control group. The anti-inflammatory effects were studied by carrageenin-induced paw edema in rats and dimethylbenzene-induced auricle swelling in mice. The analgesic effects were studied by hot-plate test and acetic acid-induced writhing experiment in mice. RESULTS The paw swelling percentage of rats in three QLQG groups was lightened significantly than that in the blank control group (P<0. 01) s Middle and high dose QLQG significantly inhibited auricle swelling of mice (P<0. 05, P<0.01) ;Three dosages of QLQG prolonged the pain threshold of mice (P<0. 05, P<0.01), lengthened latent time and reduced frequency of writhing in mice (P<0. 05,P<0. 01). CONCLUSION QLQG has certain anti-inflammatory and analgesic effects.%目的:评价前列清颗粒的抗炎、镇痛作用.方法:设前列清颗粒高、中、低3个剂量组以及吲哚美辛对照组和空白对照组,采用大鼠角叉菜胶足跖肿胀实验和小鼠二甲苯耳郭肿胀试验,观察前列清颗粒的抗炎作用;采用小鼠热板镇痛试验和扭体镇痛试验,观察前列清颗粒的镇痛作用.结果:与空白对照组比较,前列清颗粒3个剂量组能明显减轻大鼠足跖肿胀率(P<0.01);前列清颗粒中、高剂量组对小鼠耳郭肿胀具有显著的抑制作用(P<0.05,P<0.01);3组均能明显延长小鼠痛阈值(P<0.05,P<0.01);显著延长小鼠扭体的理伏时间,减少扭体次数(P<0.05,P<0.01).结论:前列清颗粒具有一定的抗炎、镇痛作用.

  9. Preparation of Micrometer Core-shell Composite Particles via Dispersion Polymerization%分散聚合法制备微米级核壳复合粒子

    张星; 郑玉婴; 陈德贤


    在硬脂酸改性纳米CaCO3存在下进行了苯乙烯(St)和丙烯酸正丁酯(nBA)的分散共聚合,制备了平均粒径为1.76 μm、单分散性较好的CaCO3/P(St-co-nBA)核壳复合粒子.包覆层聚合物P(St-co-nBA)与CaCO3粒子之间存在物理吸附和化学键合作用,使其热分解温度比共聚物P(St-co-nBA)高.经热二甲苯抽提后复合物中仍有共聚物存在,这部分共聚物与CaCO3通过化学键牢固的结合.热失重结果表明,CaCO3的稳定包覆率为6.6%.%Narrow dispersed CaCO3/poly ( styrene-co-n-butylacrylate ) ( CaCO3/P ( St-co-nBA ) ) composite particles with average diameter of 1. 76 μm were obtained via a dispersion copolymerization of St and nBA in the presence of stearic acid modified nano-CaCO3 particles. The products were characterized by transmission electron microscopy ( TEM ) , optical microscope ( OM ) , Courier transfer infrared spectroscopy ( FT-IR ) , thermogravimetric analysis ( TGA ) , and X-ray diffraction ( XRD ). The TEM images indicated the composite particles had nano-CaCO3 core and P ( St-co-nBA ) shell structure. The TGA analysis results of composite particles before and after being extracted with dimethylbenzene showed the thermal decomposition temperature of the cladding polymer was higher than that of pure copolymer P( St-co-nBA) , and some copolymer couldn't be extracted. The FT-IR spectra also confirmed the existence of copolymer on the composite particles after extracting. It suggested that the copolymer had chemical bonding with nano-CaCO3. The mass proportion of P( St-co-nBA) which couldn't be extracted with accounted for 6. 6% based on the mass of nano-CaCO3.

  10. Studies on the Pharmacologic Effects and Acute Toxicity of Peppermint Oil%薄荷油药理作用和急性毒性的研究

    陈光亮; 姚道云; 汪远金; 佘玉宝; 范峰


    Objective:To study the pharmacologic effects of peppermint oil. Method: The methods of choleretic test, dissolving gallstone in vitro, isolated smooth muscle test, acute inflammation induced by carrageenin were used. Result: Peppermint oil 120、60、30 mg/kg giving into duodenum could significantly increase the secretion volume of bile in rat, and slightly increase the concentration of cholic acid in bile. Peppermint oil 5, 0.5 and 0.05mg/L has no dissolving effect on cholesterol gallstone and bile pigment gallstone in 4~5 weeks. Peppermint oil could inhibit contraction of isolated ileum and antagonize the contraction induced by histamine and acetylcholine in guinea pigs. It could also suppress paw edema induced by carrageenin in rat and writhing induced by acetic acid in mice, but has no effect on the ear swelling caused by dimethylbenzene and cotton granulation hyperplasia and latent period of pain reaction in tail immersion test in mice. The MID>4000mg/kg as single oral doses and LD50 was 1144.9±78.5 (1069.1~1226.0) mg/kg when administered by intraperitoneal injection to mice. Conclusion: Peppermint oil has the effects of choleretic and relieve smooth muscle spasm, and the effects of anti-inflammation and analgesia were weak, but has no dissolving effect on gallstone in vitro.%目的:研究薄荷油的药理作用。方法:采用大鼠利胆、体外溶石、离体平滑肌、角叉菜胶致炎等方法。结果:薄荷油120、60、30mg/kg十二指肠给药,对大鼠有明显的利胆作用,并能轻度增加胆汁中胆汁酸的排出量。5、0.5、0.05mg/L在4~5周内对胆固醇结石、胆色素结石无明显溶解作用。薄荷油对豚鼠离体回肠有一定的抑制作用,并能拮抗组胺和乙酰胆碱引起的回肠痉挛。对角叉菜胶致大鼠足肿胀和醋酸致小鼠扭体反应有一定的抑制作用,但对二甲苯致小鼠耳肿胀、小鼠棉球肉芽肿增生、小鼠温浴致痛反应潜伏

  11. 考虑焦油的生物质气化过程热力学模型%Research on thermodynamic mathematical model of biomass gasification process with tar

    闫桂焕; 许敏; 许崇庆; 肖琦; 孙荣峰


      在生物质气化过程中焦油是不利产物,由于焦油成分的复杂性,传统生物质气化热力学模型均未考虑焦油。为了研究操作运行条件对燃气成分、焦油等影响,本文引入焦油模型化合物,考虑系统散热和碳不完全转化等因素影响,基于物质平衡、能量平衡和化学反应平衡建立了考虑焦油的生物质气化过程热力学模型。使用Newton-Raphson方法对模型进行了求解。利用文献数据验证了模型的有效性。最后,利用所建模型计算了空气预热温度、空气当量比、水蒸汽添加率等操作条件对燃气成分、焦油含量等指标的影响。结果表明,空气预热温度提高,焦油含量下降,气体热值提高;空气当量比从0.2提高到0.3,焦油含量降低,燃气中有效成分减少;水蒸汽添加率从0增加到10%,焦油含量下降,气化效率提高。研究结果可为生物质能低焦清洁利用提供参考。%Tar is a kind of very harmful product during the biomass gasification process, and it is not considered in the conventional thermodynamic mathematical model because of its components complexity. In order to research the effect of operation condition on ingredients and tar content of the fuel gas, a thermodynamic mathematical model of biomass gasification process with tar was developed based on material balance, energy balance and chemical equilibrium, taking the influences of system heat loss and carbon partial conversion into account. It is well known that the number of identified tar components is more than 100, and the components of quality ratio more than 5%are benzene, toluene, phenol, dimethylbenzene, phenylethylene, naphthalene, and so on. According to the quality equal principle of the main tar components, tar was indicated as the imaginary material C6H6.2O0.2 in the thermodynamic mathematical model. The chemical reactions selected in the model were from the deoxidization process as

  12. A Gaseous Acrolein Sensor Based on Cataluminescence Using ZrO2 /MgO Composite.%复合ZrO2/MgO催化发光丙烯醛气体传感器

    刘永慧; 曹小安; 陈福高; 张润坤


    设计了基于在纳米ZrO2中掺杂Mg0的催化发光传感器,以快速检测丙烯醛气体.与纯ZrO2相比,MgO的掺杂量为5%时,丙烯醛的催化发光强度增大了1.8倍,干扰气体乙醛的催化发光强度降为原来的约1/7.传感器在波长425 nm,温度279 ℃,流速200 mL/min条件下,对丙烯醛具有高灵敏度和选择性,发光强度与丙烯醛浓度在5-5000 mL/m3 范围内呈线性关系(r= 0.9996),检出限为1.6 ML/m3,响应时间12 s.浓度均为1000 ML/m3 的10种干扰气体通过传感器时,乙醛、甲醇、苯、甲苯和二甲苯的发光强度分别相当于丙烯醛的6.1%,2.9%,2.5%,2.5%和3.0%,其它气体不产生明显信号.本方法可方便、快速测定空气中丙烯醛气体.%A new cataluminescence (CTL) sensor using nanosized ZrO2 doped with MgO was developed to monitor gaseous acrolein promptly. When the mass content of MgO was about 5%, acrolein CTL intensity over ZrO2/MgO was 1. 8 times higher than that of pure ZrO2, moreover, the CTL intensity of acetaldehyde, a main disturbing material was only about one 7th of pure ZrO2. The proposed sensor showed high sensitivity and selectivity to acrolein at optimal conditions of: tempera-ture at 279 °C , wavelength at 425 nm; and gas flow rate at 200 mL/min. Under the optimal condi-tion, the linear range of the CTL sensor versus acrolein concentration was 5 - 5000 mL/m3 , with a detection limit of 1. 65 mL/m3 and response time of 12 s. Among ten tested species under the concen-tration of 1000 mL/m3, the CTL intensity of acetaldehyde, methanol, benzene, toluene, dimethyl-benzene were only 6. 1%, 2. 9%, 2. 5%, 2. 5%, 3. 0% of acrolein, respectively, while no obvious signal was monitored for the others. The sensor can be applied to facilitate rapid detection of acrolein in the air.

  13. 分散型黄原胶的界面修饰及性能%Interface Modification and Property of Dispersible Xanthan Gum

    赵志强; 耿铁; 苗海龙


    为改善黄原胶产生鱼眼与溶解速率小的问题,以有机金属配合物COMe为改性剂、二甲苯为分散介质,利用界面修饰法进行了黄原胶的分散改性.通过正交实验优化了分散型黄原胶(Disperse XC)的制备条件,采用红外光谱对其分子结构进行了表征,考察了Disperse XC的分散性、流变性和溶解性.研究结果表明,制备DisperseXC的最佳工艺参数为:10 g原料黄原胶XC、0.09 g COMe和4.5 g蒸馏水,用柠檬酸调整pH值约为4.5.红外表征结果表明,改性后黄原胶分子结构未发生变化,但分子间氢键作用力减弱.Disperse XC粉末在35 min内完全溶解于模拟海水中,无鱼眼产生,分散液的表观黏度为19.5 mPa·s.Disperse XC的流变性与原料黄原胶XC相当,分散性和溶解速率均优于国产分散型黄原胶XCD.%To avoid lumps and accelerate the dissolution of xanthan gum in water,surfaces of xanthan gum particles were modified in dimethylbenzene with organometallic complex COMe.The preparation condition of dispersible xanthan gum (Disperse XC) was optimized by orthogonal experiment,and its molecular structure was characterized by IR.The dispersibility,rheological property and solubility of Disperse XC were studied.The results showed that the optimum reaction condition of Disperse XC was obtained as follows:10 g xanthan gum,0.09 g COMe and 4.5 g distilled water,and the pH value was about 4.5 adjusted by citric acid.Testing result of IR showed that the molecular structure of xanthan gum didn' t change after modification,while the hydrogen bonding between xanthan gum molecuars weakened.Disperse XC powders completely dissolved in simulated seawater in 35 min without lumps,and the apparent viscosity of Disperse XC solution was 19.5 mPa·s.The rheological property of Disperse XC was similar with that of XC,dispersibility and solubility of Disperse XC were better than that of XCD.

  14. Study on the anti-inflammatory,analgesic and anti-stress effect of Wujibaifeng Pills%乌鸡白凤丸抗炎、镇痛及抗应激的药效学研究

    陈家艺; 吴清和; 黄萍; 操红缨


    目的:探讨乌鸡白凤丸抗炎、镇痛及抗应激作用,为其临床应用提供科学的理论依据。方法采用二甲苯致小鼠耳廓肿胀实验、蛋清致大鼠足趾肿胀实验以及大鼠棉球肉芽肿实验,观察乌鸡白凤丸的抗炎作用;应用小鼠热板法、醋酸扭体法观察该药的镇痛作用;通过小鼠耐疲劳、耐缺氧、耐寒冷实验观察该药的抗应激作用。结果抗炎方面:乌鸡白凤丸可显著抑制二甲苯所致小鼠耳廓肿胀度及大鼠致炎后足肿胀度,降低大鼠肉芽肿系数;镇痛方面:乌鸡白凤丸可提高热板法引起的小鼠痛阈值,抑制醋酸所致小鼠扭体反应;抗应激方面:乌鸡白凤丸能增加小鼠负荷游泳时间,延长小鼠常压耐缺氧的存活时间,降低小鼠在低温环境中的死亡率。结论乌鸡白凤丸具有显著的抗炎、镇痛及抗应激作用。%Objective To investigate the anti‐inflammatory ,analgesic and anti‐stress effects of Wujibaifeng Pills .Methods The anti‐inflammatory action of Wujibaifeng Pills was assessed by ear edema induced by using xylene in mice and injected egg white in rats ;the analgesic effect was tested by using the rat body torsion test and hot‐plate test ;antifatigue ,anti‐anoxia and low temperature‐resistant tests were used for evaluating the effects on anti‐stress .Result Anti‐inflammatory aspects :Wujibaifeng Pills high‐dose can significantly inhibit mouse auricle swelling caused by dimethylbenzene and rats foots swelling ,in addition can also decrease the granuloma of rats .Analgesic aspects :Wujibaifeng Pills can increase the pain threshold ,inhibit body torsion reaction caused by acetic acid .Stress resistance aspect :Wujibaifeng Pills can obviously increase the weight loaded swimming time in mice ,and can pro‐long the survival time of bearing hypoxia at normal pressure in mice and significantly reduce the mortality rate of mice in the low temperature

  15. 绿原酸对佐剂性关节炎模型大鼠抗炎作用及机制研究%Anti - inflammatory effect of chlorogenic acid on adjuvant arthritis rats

    徐英辉; 申茹; 刘彦彦


    目的:探讨绿原酸对佐剂性关节炎模型动物抗炎作用及机制。方法采用大鼠足跖注射 Freund's 完全佐剂形成佐剂性关节炎(AA),随机分为空白对照组、模型组、阳性对照组(尼美舒利)、绿原酸低剂量组(25 mg· kg -1)、中剂量组(50 mg·kg -1)和高剂量组(100 mg·kg -1)。观察绿原酸对佐剂性关节炎模型大鼠超敏反应与左右足跖宽度、血清肿瘤坏死因子(TNF -α)、白细胞介素-2(IL -2)、循环免疫复合物(CIC)、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH - Px)和丙二醛(MDA)的含量。结果绿原酸中剂量组(50 mg·kg -1)、高剂量组(100 mg·kg -1)能够降低含量,升高 SOD 和 GSH - Px 水平,比较差异有统计学意义(P ﹤0.05)。结论绿原酸具有抗佐剂性关节炎(AA)的作用,并通过降低 TNF -α、IL -2、CIC 和 MDA 含量及提高抗氧化能力发挥作用。%Objective To investigate the effects of the anti - inflammatory effect of chlorogenic acid on adjuvant arthri-tis rats. Methods Treated with various concentrations of chlorogenic acid on adjuvant arthritis(AA),then divided into six groups as control group,model group,positive control group(nimesulide),low dose(25 mg·kg - 1 ),medium dose(50 mg· kg - 1 )and high dose(100 mg·kg - 1 )of chlorogenic acid to observe the effect of chlorogenic acid on adjuvant arthritis model rats with left and right foot plantar width,serum tumor necrosis factor(TNF - alpha),interleukin 2(IL - 2),the a-mount of circulating immune complex(CIC),superoxide dismutase(SOD),glutathione peroxidase(GSH - Px)and malon-dialdehyde(MDA)content. Results The results demonstrated that chlorogenic acid(25 mg·kg - 1 and 100 mg·kg - 1 ) can inhibit rat ear swelling caused by dimethylbenzene and foot swelling caused by freund's adjuvant. Chlorogenic acid in medium dose group(50 mg·kg - 1 )and high dose group(100 mg·kg - 1 )could

  16. Purification of lithium hexafluorophosphate%六氟磷酸锂的纯化

    付豪; 陈俊彩; 李宣丽; 彭琴; 王辛龙; 杨林; 张志业


    Lithium hexafluorophosphate with high chloride content was prepared from PCl5 and LiF. In order to reduce chloride content and improve product purity,purifying lithium hexafluorophosphate with ethyl ether and benzene was studied. The solubilities of LiPF6,LiCl and PCl5 in ether were investigated firstly after choosing ethyl ether from ethyl ether,glycol dimethyl ether,acetonitrile and acetone. Ethyl ether could separate LiCl and LiF from the product well but not PCl5,so chloride content in LiPF6 was still too high. Another solvent must be selected to remove chloride ion. So the solubilities of PCl5 in benzene,toluene,dimethylbenzene,chlorobenzene, cyclohexane were studied. Benzene and toluene did better than others. Then benzene and toluene were used separately to purify LiPF6. The chloride content in LiPF6 was reduced to 2 mg/L by using benzene. Residue of benzene in the product after recrystallization was 0.0004%. Ethyl ether and benzene were the best solvents to purify LiPF6.%以PCl5和LiF为原料制备的LiPF6中Cl−含量较高,为了降低产品中Cl−含量以及提高产品纯度,本文采用乙醚和苯对其进行了纯化研究。在乙醚、乙二醇二甲醚、乙腈、丙酮几种溶剂中,确定了用乙醚来纯化LiPF6后,首先考察了LiPF6、LiCl、PCl5在乙醚中的溶解度,结果表明:乙醚能有效地分离LiCl和LiF,但是不能很好地分离PCl5,使得纯化后的Cl−较高。继续研究PCl5在苯、甲苯、二甲苯、氯苯、环己烷中的溶解度,结果表明:氯离子在苯和甲苯中有较好的溶解性能。继而,用苯和甲苯分别进行纯化研究,结果表明:用苯纯化后的LiPF6产品中的Cl−含量在2 mg/L以下,苯的残留量为0.0004%。认为乙醚和苯是纯化LiPF6产品的最佳溶剂选择。

  17. Chemical signatures of life in modern stromatolites from Lake Alchichica, Mexico. Applications for the search of life on Mars

    Navarro, Karina F.; Navarro-Gonzalez, Rafael; Alcocer, Javier; Escobar, Elva; Morales, Pedro; Cienfuegos, Edith; Coll, Patrice; Raulin, Francois; Stalport, Fabien; Cabane, Michel; Person, Alain; McKay, Chris

    ,5-dimethylfuran, 4-methylpyridine, ethylbenzene, dimethylbenzene, styrene, methylbenze-neamine, 2,4-hexadienal, phenol, 3-methyl-2-cyclopenten-1-one, benzonitrile, cyclopropyliden-emethylbenzene, 2,3-dihydro-1-H-indene, 1-methylethenylbenzene, 3-methylphenol, and 1-propenyl-benzene. The carbon isotopic composition of the organic fraction of the stromatolites is deter-mined by a δ 13 C=-24.28 whereas the inorganic fraction, hydromagnesite, is determined by a δ 13 C=5.86. Our data shows two interesting chemical signatures that can used to detect extant life in Martian carbonates: (1) organics are not oxidized by mineral matrix during TV-MS and TV-GC-MS analysis; and (2) distinctive carbon isotopic fractionation occurs in the or-ganic and inorganic fraction of stromatolites. Future work should center on studying fossilized stromatolites to determine if these chemical signatures are lost with time. References: Ehlmann, B.L., Mustard, J.F., Murchie, S.L. Poulet, F., Bishop, J.L., Brown, A.J., Calvin, W.M., Clark, R.N., Des Marais, D.J., Milliken, R.E., Roach, L.H., Roush, T.L., Swayze, G.A., and Wray, J.J.: 2008, Orbital identification of carbonate-bearing rocks on Mars. Science 322, 1828-1832. Escobar-Briones, E., Alcocer, J., Cienfuegos, E., and Morales P.: 1998, Carbon stable isotopes ratios of pelagic and litoral communities in Alchichica crater-lake, Mexico, Internat J Salt Lake Res 7, 345-355. Falcón, L.I., Escobar-Briones, E., and Romero, D.: 2002, Nitrogen fixation patterns displayed by cyanobacterial consortia in Alchichica crater-lake, Mexico, Hydrobiol 467, 71-78. Navarro-González, R., Navarro, K.F., de la Rosa, J., Molina, P., Iñiguez, E., Miranda, L.D., a n Morales, P., Cienfuegos, E., Coll, P., Raulin, F., Amils, R. and McKay, C.P.: 2006. The limitations on organic detection in Mars-like soils by thermal volatilization-gas chromatography-MS and their implications for the Viking results. Proc Natl Acad Sci USA 103, 16089-16094. Navarro-González, R., Iñiguez, E., de