WorldWideScience

Sample records for aminobenzene

  1. A QSAR of the toxicity of amino-benzenes and their structures

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The quantum chemical parameters and the topological indices have been calculated for the prediction of the toxicity of amino-benzenes in the environment, and work has been done on the multiple regression and neural networks. The combination of CoMFA with formation heat yields greatly improved results. A good model has been obtained which provides a basis for the studies of the toxic action mechanism.

  2. A novel voltammetric sensor for citalopram based on multiwall carbon nanotube/(poly(p-aminobenzene sulfonic acid)/β-cyclodextrin).

    Science.gov (United States)

    Gholivand, Mohammad-Bagher; Akbari, Arezoo

    2016-05-01

    Multi-walled carbon nanotube (MWCNTS) coated with poly p-aminobenzene sulfonic acid/β-cyclodextrin (p-ABSA/β-CD) film was used as an effective strategy for modification of the surface of glassy carbon electrode (GCE). Electrochemical study and determination of citalopram (CT) were investigated at the p (p-ABSA)/β-CD/MWCNT/GC using cyclic and differential pulse anodic stripping voltammetric techniques. The results indicate that the p (p-ABSA)/β-CD/MWCNT/GC significantly enhanced the oxidation peak current of CT. The modified electrode was characterized by electrochemical impedance spectroscopy (EIS), scanning electron microscopy(SEM) and cyclic voltammetry (CV).The fabricated electrochemical sensor exhibits a fast and reversible linear response toward CT within the concentration ranges of 90 nM-1 μM, 1-11 μM and 11-100 μM with correlation coefficients greater than 0.99 and detection limit of 44 nM. The resulting functionalized polymer film features interesting electrochemical properties such good recovery, reproducibility and selectivity toward CT. The applicability of the proposed sensor was tested by determination of CT in pharmaceutical combinations and human body fluids. PMID:26952450

  3. Sensitive electrochemical determination of trace cadmium on a stannum film/poly(p-aminobenzene sulfonic acid)/electrochemically reduced graphene composite modified electrode

    International Nuclear Information System (INIS)

    In this study, a novel stannum film/poly(p-aminobenzene sulfonic acid)/graphene composite modified glassy carbon electrode (GCE) was prepared by using electrodeposition of exfoliated graphene oxide, electropolymerization of p-aminobenzene sulfonic acid (p-ABSA) and in situ plating stannum fim methods, successively. This sensor was further used for sensitive determination of trace cadmium ions by square wave anodic stripping voltammetry (SWASV). The morphologies and electrochemistry properties of the modified electrode were characterized by scanning electron microscopy, Raman spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy and linear sweep voltammetry. It was found that the formed graphene layer on the top of GCE could remarkably facilitate the electron transfer and enlarge the specific surface area of the electrode. While the poly(p-ABSA) film could effectively increase the adhesion and stability of graphene layer, enhance ion-exchange capacity and prevent the macromolecule in real samples absorbing on the surface of electrode. By combining co-deposits ability with heavy metals of stannum film, the obtained electrode exhibited a good stripping performance for the analysis of Cd(II). Under the optimum conditions, a linear response was observed in the range from 1.0 to 70.0 μgL−1 with a detection limit of 0.05 μgL−1 (S/N = 3). The sensor was further applied to the determination of cadmium ions in real water samples with satisfactory results

  4. Effect of methoxy or benzyloxy groups bound to an amino-benzene donor unit for various nonlinear optical chromophores as studied by hyper-Rayleigh scattering

    Energy Technology Data Exchange (ETDEWEB)

    Yamada, Toshiki, E-mail: toshiki@nict.go.jp [Advanced ICT Research Institute, National Institute of Information and Communications Technology, 588-2 Iwaoka, Kobe 651-2492 (Japan); Aoki, Isao; Miki, Hideki; Yamada, Chiyumi; Otomo, Akira [Advanced ICT Research Institute, National Institute of Information and Communications Technology, 588-2 Iwaoka, Kobe 651-2492 (Japan)

    2013-05-15

    We report the molecular first hyperpolarizability (β) of a series of nonlinear optical (NLO) chromophores comprising amino-benzene with an additional methoxy or benzyloxy group as the donor units, polyene, phenyl-di-vinylene, or thienyl-di-vinylene as the π-electron bridges, and 2-(dicyanomethylene)-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF), 2-(dicyanomethylene)-3-cyano-4,5-dimethyl-5-trifluoromethyl-2, 5-dihydrofuran (CF{sub 3}–TCF) or 2-(dicyanomethylene)-3-cyano-4-methyl-5-phenyl-5-trifluoromethyl-2, 5-dihydrofuran (CF{sub 3}–phenyl–TCF) as the acceptor units. An improvement in linear and nonlinear optical properties was found in the long π-conjugated NLO chromophores with methoxy or benzyloxy groups compared with benchmark chromophores without these groups. We also discuss a possible mechanism with a contribution for improvement, that is, intra-molecular hydrogen bonding. Highlights: ► We report the molecular first hyperpolarizability of a series of NLO chromophores. ► Effect of methoxy or benzyloxy group bound to amino-benzene donor unit was studied. ► Improvements in NLO properties were found for the modified NLO chromophores. ► Intra-molecular hydrogen bonding as a mechanism for the improvement was proposed. ► We found an important area of progress in the design of NLO chromophores.

  5. Effect of methoxy or benzyloxy groups bound to an amino-benzene donor unit for various nonlinear optical chromophores as studied by hyper-Rayleigh scattering

    International Nuclear Information System (INIS)

    We report the molecular first hyperpolarizability (β) of a series of nonlinear optical (NLO) chromophores comprising amino-benzene with an additional methoxy or benzyloxy group as the donor units, polyene, phenyl-di-vinylene, or thienyl-di-vinylene as the π-electron bridges, and 2-(dicyanomethylene)-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF), 2-(dicyanomethylene)-3-cyano-4,5-dimethyl-5-trifluoromethyl-2, 5-dihydrofuran (CF3–TCF) or 2-(dicyanomethylene)-3-cyano-4-methyl-5-phenyl-5-trifluoromethyl-2, 5-dihydrofuran (CF3–phenyl–TCF) as the acceptor units. An improvement in linear and nonlinear optical properties was found in the long π-conjugated NLO chromophores with methoxy or benzyloxy groups compared with benchmark chromophores without these groups. We also discuss a possible mechanism with a contribution for improvement, that is, intra-molecular hydrogen bonding. Highlights: ► We report the molecular first hyperpolarizability of a series of NLO chromophores. ► Effect of methoxy or benzyloxy group bound to amino-benzene donor unit was studied. ► Improvements in NLO properties were found for the modified NLO chromophores. ► Intra-molecular hydrogen bonding as a mechanism for the improvement was proposed. ► We found an important area of progress in the design of NLO chromophores

  6. Effect of the intercalated cation-exchanged on the properties of nanocomposites prepared by 2-aminobenzene sulfonic acid with aniline and montmorillonite

    International Nuclear Information System (INIS)

    Polymer/montmorillonite nanocomposites were prepared. Intercalation of 2-aminobenzene sulfonic acid with aniline monomers into montmorillonite modified by cation was followed by subsequent oxidative polymerization of monomers in the interlayer spacing. The clay was prepared by cation exchange process between sodium cation in (M–Na) and copper cation (M–Cu). XRD analyses show the manifestation of a basal spacing (d-spacing) for M–Cu changes depending on the inorganic cation and the polymer intercalated in the M–Cu structure. TGA analyses reveal that polymer/M–Cu composites is less stable than M–Cu. The conductivity of the composites is found to be 103 times higher than that for M–Cu. The microscopic examinations including TEM picture of the nanocomposite demonstrated an entirely different and more compatible morphology. Remarkable differences in the properties of the polymers have also been observed by UV–Vis and FTIR, suggesting that the polymer produced with presence of aniline has a higher degree of branching. The electrochemical behavior of the polymers extracted from the nanocomposites has been studied by cyclic voltammetry which indicates the electroactive effect of nanocomposite gradually increased with aniline in the polymer chain.

  7. A capacitive sensor based on molecularly imprinted polymers and poly(p-aminobenzene sulfonic acid) film for detection of pazufloxacin mesilate

    Institute of Scientific and Technical Information of China (English)

    ZHOU Lu; YE GuangRong; YUAN Ruo; CHAI YaQin; CHEN SuMing

    2007-01-01

    A novel capacitive sensor for pazufloxacin mesilate (pazufloxacin) determination was developed by electropolymerizing p-aminobenzene sulfonic (p-ABSA) and molecularly imprinted polymers (MIPs), which was synthesized through thermal radical copolymerization of metharylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) in the presence of pazufloxacin template molecules, on the gold electrode surface. Furthermore, 1-dedecanethiol was used to insulate the modified electrode. Alternating current (ac) impedance experiments were carried out with a Model IM6e to obtain the capacitance responses. Under the optimum conditions, the sensor showed linear capacitance response to pazufloxacin in the range of 5ng·Ml-1 to 5μg·mL-1 with a relative standard deviation (RSD) 5.3% (n=7) and a detection limit of 1.8 ng·mL-1. The recoveries for different concentration levels of pazufloxacin samples varied from 94.0% to 102.0%. Electrochemical experiments indicated the capacitive sensor exhibited good sensitivity and selectivity and showed excellent parameters of regeneration and stability.

  8. A capacitive sensor based on molecularly imprinted polymers and poly(p-aminobenzene sulfonic acid) film for detection of pazufloxacin mesilate

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A novel capacitive sensor for pazufloxacin mesilate (pazufloxacin) determination was developed by electropolymerizing p-aminobenzene sulfonic (p-ABSA) and molecularly imprinted polymers (MIPs), which was synthesized through thermal radical copolymerization of metharylic acid (MAA) and ethyl-ene glycol dimethacrylate (EGDMA) in the presence of pazufloxacin template molecules, on the gold electrode surface. Furthermore, 1-dedecanethiol was used to insulate the modified electrode. Alter-nating current (ac) impedance experiments were carried out with a Model IM6e to obtain the capaci-tance responses. Under the optimum conditions, the sensor showed linear capacitance response to pazufloxacin in the range of 5 ng·mL-1 to 5 μg·mL-1 with a relative standard deviation (RSD) 5.3% (n=7) and a detection limit of 1.8 ng·mL-1. The recoveries for different concentration levels of pazufloxacin samples varied from 94.0% to 102.0%. Electrochemical experiments indicated the capacitive sensor exhibited good sensitivity and selectivity and showed excellent parameters of regeneration and stabil-ity.

  9. Effect of the intercalated cation-exchanged on the properties of nanocomposites prepared by 2-aminobenzene sulfonic acid with aniline and montmorillonite

    Energy Technology Data Exchange (ETDEWEB)

    Toumi, I. [Laboratoire de Chimie Organique, Macromoleculaire et des Materiaux, Universite de Mascara, Bp 763 Mascara 29000 (Algeria); Benyoucef, A., E-mail: ghani29000@yahoo.fr [Laboratoire de Chimie Organique, Macromoleculaire et des Materiaux, Universite de Mascara, Bp 763 Mascara 29000 (Algeria); Yahiaoui, A. [Laboratoire de Chimie Organique, Macromoleculaire et des Materiaux, Universite de Mascara, Bp 763 Mascara 29000 (Algeria); Quijada, C. [Departamento de Ingenieria Textil y Papelera, Universidad Politecnica de Valencia, Pza Ferrandiz i Carbonel, E-03801 Alcoy, Alicante (Spain); Morallon, E. [Departamento de Quimica Fisica e Instituto Universitario de Materiales, Universidad de Alicante, Apartado 99, E-03080 Alicante (Spain)

    2013-02-25

    Polymer/montmorillonite nanocomposites were prepared. Intercalation of 2-aminobenzene sulfonic acid with aniline monomers into montmorillonite modified by cation was followed by subsequent oxidative polymerization of monomers in the interlayer spacing. The clay was prepared by cation exchange process between sodium cation in (M-Na) and copper cation (M-Cu). XRD analyses show the manifestation of a basal spacing (d-spacing) for M-Cu changes depending on the inorganic cation and the polymer intercalated in the M-Cu structure. TGA analyses reveal that polymer/M-Cu composites is less stable than M-Cu. The conductivity of the composites is found to be 10{sup 3} times higher than that for M-Cu. The microscopic examinations including TEM picture of the nanocomposite demonstrated an entirely different and more compatible morphology. Remarkable differences in the properties of the polymers have also been observed by UV-Vis and FTIR, suggesting that the polymer produced with presence of aniline has a higher degree of branching. The electrochemical behavior of the polymers extracted from the nanocomposites has been studied by cyclic voltammetry which indicates the electroactive effect of nanocomposite gradually increased with aniline in the polymer chain.

  10. Flame Atomic Absorption Spectrometric Determination of Trace Metal Ions in Environmental and Biological Samples After Preconcentration on a Newly Developed Amberlite XAD-16 Chelating Resin Containing p-Aminobenzene Sulfonic Acid.

    Science.gov (United States)

    Islam, Aminul; Ahmad, Akil; Laskar, Mohammad Asaduddin

    2015-01-01

    Amberlite® XAD-16 was functionalized with p-aminobenzene sulfonic acid via an azo spacer in order to prepare a new chelating resin, which was then characterized by water regain value, hydrogen ion capacity, elemental analyses, and IR spectral and thermal studies. The maximum uptake of Cu(II), Ni(II), Zn(II), Co(II), Cr(III), Fe(III), and Pb(II) ions was observed in the pH range 4.0-6.0 with the corresponding half-loading times of 6.5, 7.0, 8.0, 9.0, 11.0, 8.5, and 16.5 min. The sorption data followed Langmuir isotherms and a pseudo-second-order model. Thermodynamic quantities, ΔH and ΔS, based on the variation of the distribution coefficient with temperature were also evaluated. High preconcentration factors of 60-100 up to a low preconcentration limit of 4.0-6.6 μg/L have been achieved for the metal ions. The validity of the method was checked by analyzing standard reference materials and recoveries of trace metals after spiking. The analytical applications of the method were explored by analyzing natural water, mango pulp, mint leaves, and fish. PMID:25857893

  11. CdSe量子点与对氨基苯磺酸偶联反应研究%Coupling reaction of CdSe quantum dots with aminobenzene sulfonic acid

    Institute of Scientific and Technical Information of China (English)

    王伟杰; 俞英; 林碧霞; 梁耀珍

    2011-01-01

    The water soluble CdSe QDs, which were prepared by wrapping nanoparticles of the CdSe QD's with mercapto-propionic acid ( M PA) , were covalently conjugated with ami-nobenzene sulfonic acid ( ABSA) by linker EDC and NHS. The CdSe/MPA/ABSA was characterized using transmission electron microscopy, UV-vis spectrometry, fluorescence spec-trometry, fluorescence decay spectrometry, IR spectrometry, Capillary electrophoregrams. The coupled complex of CdSe QDs with ABSA was proved to be successfully. The results show that CdSe/MPA/ABSA possess fine optical properties.%以巯基丙酸为修饰剂合成水溶性硒化镉量子点(CdSe/MPA),利用碳化二亚胺(EDC)和琥珀酰亚胺(NHS)两种偶联剂,将对氨基苯磺酸与硒化镉量子点进行偶联以制备量子点-对氨基苯磺酸偶合物.通过透射电子显微镜、紫外-可见光谱、荧光光谱、荧光寿命、红外光谱、毛细管电泳对偶合物进行了表征.结果表明:量子点和对氨基苯磺酸偶联成功,该偶合物基本保持了量子点的荧光性能,可以作为研究植物病理的荧光探针.

  12. Determination of glucose at poly(p-aminobenzene sulfonic acid)/graphene composite modified glassy carbon electrode%聚对氨基苯磺酸/石墨烯复合膜修饰玻碳电极测定葡萄糖

    Institute of Scientific and Technical Information of China (English)

    许春萱; 宋力; 余萌; 蔡翠玲

    2011-01-01

    制备了对氨基苯磺酸/石墨烯复合膜修饰电极,研究了葡萄糖在该修饰电极上的电化学行为.在0.1 moL/L NaOH溶液中,峰电流与葡萄糖的浓度在1 ×1O-6 ~5 ×1O-4 mol/L的范围内呈良好的线性关系,检出限为2×10-7 mol/L(S/N =3).实验结果表明对氨基苯磺酸/石墨烯复合膜显著提高了方法的检测灵敏度.利用该传感器测定了人血清中的葡萄糖,回收率在97.2%~104.1%之间.%A poly (p-aminobenzene sulfonic acid)/graphene composite film modified glassy carbon electrode was fabricated for glucose determination. In 0. 1 mol/L NaOH solution, the peak currents varied linearly with the concentration of glucose in the range of 1x10-6 ~5x10-4 mol/L with the detection limit of 2x10-7 mol/L(S/N =3). It indicated that the composite fibs obviously improved the sensitivity for the glucose determination. The biosensor was used in the determination of glucose in serum with recoveries ranging from 97. 2 % to 104.1%.

  13. Improved Method for the Synthesis of New 1,5-Benzothiazepine Derivatives as Analogues of Anticancer Drugs

    Directory of Open Access Journals (Sweden)

    L. Prakash

    1997-09-01

    Full Text Available (±cis-2-(4-Methoxyphenyl-3-hydroxy/methoxy-2,3-dihydro-1,5-benzothiazepin-4[5H/5-chloroacetyl/5-(4'-methylpiperazino-1'acetyl]-ones have been synthesized by the condensation of 2-aminobenzene thiols with methyl(±trans-3-(4-methoxyphenylglycidate in xylene. The synthesized compounds have been characterized by elemental analyses and spectral data and screened for their antimicrobial activity.

  14. 3-Amino-1-(4-methoxyphenyl-9,10-dihydrophenanthrene-2,4-dicarbonitrile

    Directory of Open Access Journals (Sweden)

    Abdullah M. Asiri

    2011-09-01

    Full Text Available In the title compound, C23H17N3O, significant deviations from planarity are evidenced. This is quantified in the dihedral angles formed between the central amino-benzene ring and the benzene rings of the methoxybenzene [67.93 (8°] and 1,2-dihydronaphthalene [28.27 (8°] residues. In the crystal the amino-H atoms form hydrogen bonds to the methoxy-O atom and to one of the cyano-N atoms to generate a two-dimensional array with a zigzag topology that stacks along the (overline{1} overline{1} 1 plane.

  15. Serotonin sensor based on a glassy carbon electrode modified with multiwalled carbon nanotubes, chitosan and poly(p-aminobenzenesulfonate)

    International Nuclear Information System (INIS)

    A glassy carbon electrode was modified with a nanocomposite prepared from poly(p-aminobenzene sulfonic acid), multi-walled carbon nanotubes and chitosan to obtain a differential pulse voltammetric sensor for serotonin that is remarkably stable and displays enhanced current response. Its peak current (at 0.38 V vs. Ag/AgCl) varied linearly with the concentration of serotonin in the 0.1–100 μM range, and the detection limit is 80 nM (at an S/N of 3). The sensor was successfully applied to the determination of serotonin in (spiked) human blood serum. (author)

  16. 3-Amino-1-(2H-1,3-benzodioxol-5-yl-9,10-dihydrophenanthrene-2,4-dicarbonitrile

    Directory of Open Access Journals (Sweden)

    Abdullah M. Asiri

    2011-09-01

    Full Text Available In the title compound, C23H15N3O2, significant deviations from planarity are evidenced in the values of the dihedral angles formed between the amino-benzene ring and the benzene rings of the 1,3-benzodioxole [65.38 (12°] and 1,2-dihydronaphthalene [26.27 (14°] residues; the dioxole ring has an envelope conformation with the methylene-C being the flap atom. The amino-H atoms form hydrogen bonds to one of the dioxole-O atoms and to one of the cyano-N atoms to generate a two-dimensional array with a zigzag topology that stacks along the (overline{1} 0 2 plane.

  17. Novel hierarchical architectures of Sb2WO6: template-free hydrothermal synthesis and photocatalytic reduction property for azo compound

    International Nuclear Information System (INIS)

    Novel hierarchical architectures of Sb2WO6 are synthesized successfully by a simple hydrothermal process without any organic solvent or surfactant. The physicochemical properties of the as-prepared products are characterized in detail. Interestingly, the morphologies of Sb2WO6 could be selectively controlled by adjusting pH values of the reactive solutions. The tuft-like, cockscomb-like, and flower-like hierarchical architectures are obtained at pH = 1, 3, and 5, respectively. Based on the time-dependent experimental results, a possible growth mechanism is proposed, which reasonably follows a synergy interaction of reaction–crystallization and dissolution–recrystallization processes. The photocatalytic activities of the novel hierarchical Sb2WO6 are evaluated by the decomposition of azo compounds for the first time. Results show that the as-prepared samples exhibit the excellent photocatalytic activity and universality for the reduction of azo compounds. The conversion of methyl orange reaches 98 % after 140 min of light irradiation. HPLC–MS indicates that the selectivity of 4-aminobenzene sulfonic acid is over 99 %.

  18. 2-(5,6-Diphenyl-1,2,4-triazin-3-ylaniline

    Directory of Open Access Journals (Sweden)

    Mariusz Mojzych

    2012-12-01

    Full Text Available The title compound, C21H16N4, obtained under standard Suzuki cross-coupling conditions, is a model compound in the synthesis and biological activity evaluation of new aza-analogues of sildenafil containing a pyrazolo[4,3-e][1,2,4]triazine system. An N—H...N intramolecular hydrogen bond involving the aminobenzene system and the 1,2,4-triazine moiety helps to establish a near coplanar orientation of the rings with a dihedral angle of 12.04 (4°, which is believed to be necessary for the biological activity of sildenafil analogues. The 1,2,4-triazine ring is slightly distorted from planarity [r.m.s deviation = 0.0299 (11 Å] and forms dihedral angles of 58.60 (4 and 36.35 (3° with the pendant phenyl rings. The crystal packing features bifurcated N—H...(N,N hydrogen bonds linking screw-axis-related molecules into chains parallel to the [010] direction< and π–π interactions, with a centroid–centroid separation of 3.8722 (7 Å and a slippage of 1.412 (3 Å. The crystal studied was a nonmerohedral twin with a ratio of 0.707 (2:0293 (2.

  19. 3-Amino-1-(thiophen-2-yl-9,10-dihydrophenanthrene-2,4-dicarbonitrile

    Directory of Open Access Journals (Sweden)

    Abdulrahman O. Al-Youbi

    2012-04-01

    Full Text Available In the title compound, C20H13N3S, the partially saturated ring adopts a twisted half-boat conformation with the methylene C atom closest to the aminobenzene ring lying 0.690 (6 Å out of the plane defined by the five remaining atoms. The dihydrophenanthrene residue has a folded conformation [dihedral angle between the outer benzene rings = 26.27 (18°]. The thiophen-2-yl ring forms a dihedral angle of 63.76 (19° with the benzene ring to which it is attached. In the crystal, inversion dimers linked by pairs of N—H...N hydrogen bonds generate R22(12 loops. The dimers are linked into layers in the bc plane by weak C—H...π interactions. The thiophen-2-yl ring is disordered over two essentially coplanar but opposite orientations in a 0.918 (4:0.082 (4 ratio.

  20. Remediation of textile azo dye acid red 114 by hairy roots of Ipomoea carnea Jacq. and assessment of degraded dye toxicity with human keratinocyte cell line.

    Science.gov (United States)

    Jha, Pamela; Jobby, Renitta; Desai, N S

    2016-07-01

    Bioremediation has proven to be the most desirable and cost effective method to counter textile dye pollution. Hairy roots (HRs) of Ipomoea carnea J. were tested for decolourization of 25 textile azo dyes, out of which >90% decolourization was observed in 15 dyes. A diazo dye, Acid Red 114 was decolourized to >98% and hence, was chosen as the model dye. A significant increase in the activities of oxidoreductive enzymes was observed during decolourization of AR114. The phytodegradation of AR114 was confirmed by HPLC, UV-vis and FTIR spectroscopy. The possible metabolites were identified by GCMS as 4- aminobenzene sulfonic acid 2-methylaniline and 4- aminophenyl 4-ethyl benzene sulfonate and a probable pathway for the biodegradation of AR114 has been proposed. The nontoxic nature of the metabolites and toxicity of AR114 was confirmed by cytotoxicity tests on human keratinocyte cell line (HaCaT). When HaCaT cells were treated separately with 150μgmL(-1) of AR114 and metabolites, MTT assay showed 50% and ≈100% viability respectively. Furthermore, flow cytometry data showed that, as compared to control, the cells in G2-M and death phase increased by 2.4 and 3.6 folds respectively on treatment with AR114 but remained unaltered in cells treated with metabolites. PMID:26971029

  1. Modeling Bimolecular Reactions and Transport in Porous Media Via Particle Tracking

    Energy Technology Data Exchange (ETDEWEB)

    Dong Ding; David Benson; Amir Paster; Diogo Bolster

    2012-01-01

    We use a particle-tracking method to simulate several one-dimensional bimolecular reactive transport experiments. In this numerical method, the reactants are represented by particles: advection and dispersion dominate the flow, and molecular diffusion dictates, in large part, the reactions. The particle/particle reactions are determined by a combination of two probabilities dictated by the physics of transport and energetics of reaction. The first is that reactant particles occupy the same volume over a short time interval. The second is the conditional probability that two collocated particles favorably transform into a reaction. The first probability is a direct physical representation of the degree of mixing in an advancing displacement front, and as such lacks empirical parameters except for the user-defined number of particles. This number can be determined analytically from concentration autocovariance, if this type of data is available. The simulations compare favorably to two physical experiments. In one, the concentration of product, 1,2-naphthoquinoe-4-aminobenzene (NQAB) from reaction between 1,2-naphthoquinone-4-sulfonic acid (NQS) and aniline (AN), was measured at the outflow of a column filled with glass beads at different times. In the other, the concentration distribution of reactants (CuSO_4 and EDTA^{4-}) and products (CuEDTA^{4-}) were quantified by snapshots of transmitted light through a column packed with cryloite sand. The thermodynamic rate coefficient in the latter experiment was 10^7 times greater than the former experiment, making it essentially instantaneous. When compared to the solution of the advection-dispersion-reaction equation (ADRE) with the well-mixed reaction coefficient, the experiments and the particle-tracking simulations showed on the order of 20% to 40% less overall product, which is attributed to poor mixing. The poor mixing also leads to higher product concentrations on the edges of the mixing zones, which the particle

  2. Degradation network reconstruction in uric acid and ammonium amendments in oil-degrading marine microcosms guided by metagenomic data

    Directory of Open Access Journals (Sweden)

    Rafael eBargiela

    2015-11-01

    Full Text Available Biostimulation with different nitrogen sources is often regarded as a strategy of choice in combating oil spills in marine environments. Such environments are typically depleted in nitrogen, therefore limiting the balanced microbial utilization of carbon-rich petroleum constituents. It is fundamental, yet only scarcely accounted for, to analyse the catabolic consequences of application of biostimulants. Here, we examined such alterations in enrichment microcosms using sediments from chronically crude oil-contaminated marine sediment at Ancona harbor (Italy amended with natural fertilizer, uric acid (UA, or ammonium (AMM. We applied the web-based AromaDeg resource using as query Illumina HiSeq meta-sequences (UA: 27,893 open reading frames; AMM: 32,180 to identify potential catabolic differences. A total of 45 (for UA and 65 (AMM gene sequences encoding key catabolic enzymes matched AromaDeg, and their participation in aromatic degradation reactions could be unambiguously suggested. Genomic signatures for the degradation of aromatics such as 2-chlorobenzoate, indole-3-acetate, biphenyl, gentisate, quinoline and phenanthrene were common for both microcosms. However, those for the degradation of orcinol, ibuprofen, phenylpropionate, homoprotocatechuate and benzene (in UA and 4-aminobenzene-sulfonate, p-cumate, dibenzofuran and phthalate (in AMM, were selectively enriched. Experimental validation was conducted and good agreement with predictions was observed. This suggests certain discrepancies in action of these biostimulants on the genomic content of the initial microbial community for the catabolism of petroleum constituents or aromatics pollutants. In both cases, the emerging microbial communities were phylogenetically highly similar and were composed by very same proteobacterial families. However, examination of taxonomic assignments further revealed different catabolic pathway organization at the organismal level, which should be considered

  3. Degradation Network Reconstruction in Uric Acid and Ammonium Amendments in Oil-Degrading Marine Microcosms Guided by Metagenomic Data

    KAUST Repository

    Bargiela, Rafael

    2015-11-24

    Biostimulation with different nitrogen sources is often regarded as a strategy of choice in combating oil spills in marine environments. Such environments are typically depleted in nitrogen, therefore limiting the balanced microbial utilization of carbon-rich petroleum constituents. It is fundamental, yet only scarcely accounted for, to analyze the catabolic consequences of application of biostimulants. Here, we examined such alterations in enrichment microcosms using sediments from chronically crude oil-contaminated marine sediment at Ancona harbor (Italy) amended with natural fertilizer, uric acid (UA), or ammonium (AMM). We applied the web-based AromaDeg resource using as query Illumina HiSeq meta-sequences (UA: 27,893 open reading frames; AMM: 32,180) to identify potential catabolic differences. A total of 45 (for UA) and 65 (AMM) gene sequences encoding key catabolic enzymes matched AromaDeg, and their participation in aromatic degradation reactions could be unambiguously suggested. Genomic signatures for the degradation of aromatics such as 2-chlorobenzoate, indole-3-acetate, biphenyl, gentisate, quinoline and phenanthrene were common for both microcosms. However, those for the degradation of orcinol, ibuprofen, phenylpropionate, homoprotocatechuate and benzene (in UA) and 4-aminobenzene-sulfonate, p-cumate, dibenzofuran and phthalate (in AMM), were selectively enriched. Experimental validation was conducted and good agreement with predictions was observed. This suggests certain discrepancies in action of these biostimulants on the genomic content of the initial microbial community for the catabolism of petroleum constituents or aromatics pollutants. In both cases, the emerging microbial communities were phylogenetically highly similar and were composed by very same proteobacterial families. However, examination of taxonomic assignments further revealed different catabolic pathway organization at the organismal level, which should be considered for designing

  4. Noble Metal Nanoparticle-loaded Mesoporous Oxide Microspheres for Catalysis

    Science.gov (United States)

    Jin, Zhao

    Noble metal nanoparticles/nanocrystals have attracted much attention as catalysts due to their unique characteristics, including high surface areas and well-controlled facets, which are not often possessed by their bulk counterparts. To avoid the loss of their catalytic activities brought about by their size and shape changes during catalytic reactions, noble metal nanoparticles/nanocrystals are usually dispersed and supported finely on solid oxide supports to prevent agglomeration, nanoparticle growth, and therefore the decrease in the total surface area. Moreover, metal oxide supports can also play important roles in catalytic reactions through the synergistic interactions with loaded metal nanoparticles/nanocrystals. In this thesis, I use ultrasonic aerosol spray to produce hybrid microspheres that are composed of noble metal nanoparticles/nanocrystals embedded in mesoporous metal oxide matrices. The mesoporous metal oxide structure allows for the fast diffusion of reactants and products as well as confining and supporting noble metal nanoparticles. I will first describe my studies on noble metal-loaded mesoporous oxide microspheres as catalysts. Three types of noble metals (Au, Pt, Pd) and three types of metal oxide substrates (TiO2, ZrO2, Al 2O3) were selected, because they are widely used for practical catalytic applications involved in environmental cleaning, pollution control, petrochemical, and pharmaceutical syntheses. By considering every possible combination of the noble metals and oxide substrates, nine types of catalyst samples were produced. I characterized the structures of these catalysts, including their sizes, morphologies, crystallinity, and porosities, and their catalytic performances by using a representative reduction reaction from nitrobenzene to aminobenzene. Comparison of the catalytic results reveals the effects of the different noble metals, their incorporation amounts, and oxide substrates on the catalytic abilities. For this particular

  5. J酸分光光度法测定芳香族氨基化合物%Spectrophotometric Determination of Aromatic Amino Compounds with J-Ac i d

    Institute of Scientific and Technical Information of China (English)

    尹晓航; 施文健; 沈昕; 马骏涛; 李亮

    2015-01-01

    dye ,which had a maximum adsorption at 480 nm .The molar adsorption coeffcients of aniline ,4-aminobenzene sulfonic acid and 1-naphthylamine were 3.95 × 104 ,3.24 × 104 and 3.91 × 104 L・mol-1 ・cm-1 ,respectively .Experimental results showed that common coexisting ions on the surface water did not affect the results of determination .J-Acid of spectrophotometry was used to determine the samples of Shanghai Fu Xing Dao canal .Meanwhile ,recovery experiments by standard addition method were done .Experiment results showed that the recoveries of aniline were in the range of 98.5% ~102.1% ,and RSD was 2.08% .J-Acid is a common organic reagent .It is sol-uble in water and low volatile ,and its toxicity is much lower than N-ethylenediamine .spectrophotometric determination of aro-matic amino compounds by J-Acid has the advantage of high sensitivity ,good selectivity ,simple rapid operation and accurate re-sults ,and thus it can be used for the determination of trace aromatic amino compounds in the environmental water .