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Li F.,Tianjin University of Commerce | Song W.,Tianjin University of Commerce | Wei J.,Tianjin Modern Vocational Technology College | Liu C.,Arizona State University | Yu C.,Tianjin University of Commerce
International Biodeterioration and Biodegradation | Year: 2016

Phenol is a widespread environmental pollutant due to their broad usage and applications, and presence in many industrial effluents. To date, bacterial degradation of phenol remains to be the preferred method for its removal and remediation. Although the degradation pathway has been extensively studied, the variations in the level of expression of the key enzymes during catabolism are still not quantitatively understood. An explicit quantitative expression helps us know the degradation process in detail. It is important and valuable for us to further understand mechanisms underlying phenol degradation. In this study, we used iTRAQ-based comparative proteomics analysis approach to determine variations in expression and regulation of key enzymes in Arthrobacter during phenol degradation. We propose that the phenol biodegradation pathway is mainly determined by 5 pivotal enzymes, which belonged to 3-oxoadipate pathway and tricarboxylic acid cycle. Arthrobacter mainly degrades phenol through 3-oxoadipate pathway, which makes the pathway of this strain for degrading the toxic compound clearer. These findings provide new insights into phenol biodegradation process and would help us understand the step by step stages of this metabolic pathway. © 2016 Elsevier Ltd.

Wang H.-S.,China Pharmaceutical University | Wei J.-P.,Tianjin Modern Vocational Technology College
Nanoscale | Year: 2015

The major scientific challenge of enantiomeric separation is to develop simple, rapid, and sensitive routine analytical methods. Generally, enantio-resolution is still based on "three-point interaction" theory, which indicates that homochiral sites are needed for enantio-selective interaction. However, in recent years, advanced materials with precise homochiral fabrication at the nanoscale have been synthesized, and have shown great potential in development of high-throughput enantio-resolution methods. This tutorial review summarizes fabrication and applications of homochiral materials for enantio-selective recognition and separation. These materials, which include intrinsic and restructured chiral metal surfaces, plasmonic nanostructures, coordination polymers, organic polymer sensors, and molecularly imprinted polymers, have been applied as sensors or chiral stationary phases (CSPs) for efficient enantio-resolution. This journal is © The Royal Society of Chemistry.

Liu M.L.,Tianjin Modern Vocational Technology College | Gu W.,Nankai University | Liu X.,Nankai University
Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya | Year: 2014

Two new ionic complexes built on polyoxometalate anions of [CoW12O40]6- and Ln3+ (Ln = Ce, Nd) cations, namely [Ce(CoW12O40)(NMP)2(H2O)6][Ce(NMP)(H2O)8] · 3H2O · NMP (I) and [Nd(CoW12O40)(NMP)2(H2O)6][Nd(NMP)(H2O)8] · 7H2O (II) (NMP = N-methyl-2-pyrrolidone) have been synthesized. Single crystal X-ray crystallographic analyses (CIF files CCDC nos. 704837 (I) and 689561 (II)) revealed that the structures of two complexes were similar, which crystallize in the P21/n monoclinic space group. Complexes I and II were both ionic clusters and the coordination numbers of Ln3+ (Ln = Ce, Nd) were nine. The unit cell parameters for I: a = 17.551(4), b = 17.783(4), c = 26.729(5) Å, β = 101.33(3)°, V = 8180(3) Å3, Z = 4. The unit cell parameters for II: a = 17.571(3), b = 17.750(3), c = 28.989(9) Å, β = 115.42(2)°, V = 8166(3) Å3, Z = 4. Complex I was characterized by TG analysis. Variable-temperature magnetic susceptibility measurements showed that there exists a weak antiferromagnetic interaction of complex II. © 2014 Pleiades Publishing, Ltd.

Liu Y.,Tianjin University of Technology and Education | Zheng H.-X.,Tianjin University of Technology and Education | Wu G.-X.,Tianjin Modern Vocational Technology College
2012 10th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2012 | Year: 2012

To simulate elastic wave propagating in different solid medium, a three dimensional model has been developed Based on Yee's algorithm, the staggered grid of the stressvelocity equations for the model has been set up, and the finite-difference form of it has been derived. The perfectly matched layer (PML) absorbing boundary is discussed, and the finite-difference scheme of the PML boundary conditions is implemented. Active simulation of the interaction of elastic wave with layered medium and cubic object has been finished, respectively. Numerical experiments have proved the effectiveness of the proposed method. © 2012 IEEE.

Wu S.-X.,Tianjin University of Science and Technology | Wu S.-X.,Tianjin Modern Vocational Technology College | Sha Z.-L.,Tianjin University of Science and Technology
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2013

The continuous crystallization process of KCl-H2O system in a 10 L Draft Tube Baffle (DTB) crystallizer was studied by Computational Fluid Dynamics (CFD). The model of multiphase flow and the population balance equations coupling solution was used with one continuous phase and five different sizes crystals of the dispersed phase. The flow field and solid suspension were studied under different feed velocities and feed mass concentration considering the conditions of crystal growth and nucleation, and the influence of the operation conditions on the crystallization process was analyzed based on the characteristic parameters of fluid dynamics characteristics, supersaturation distribution and crystals size distribution, etc. The simulation results show that the feed velocity and feed mass concentration have an obvious effect on supersaturation distribution and crystal size distribution, while little effect on the flow field.

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