Tianjin Modern Vocational Technology College

Tianjin, China

Tianjin Modern Vocational Technology College

Tianjin, China
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Wang J.,Tianjin University | Wang J.,Tianjin Modern Vocational Technology College | Feng Y.,Tianjin University | Li X.,Tianjin University
Polymers and Polymer Composites | Year: 2017

A new coloured polymer particle was prepared, in which chromophoric groups were introduced onto the surface of the polymer particle for use in electronic ink. The structure, morphology and thermal stability of polymer electrophoretic particles were characterized using FTIR, solid state 13C-NMR, SEM and TGA. Electrophoretic mobility measurements proved that the polymer particles had negative charges in the electrophoretic dispersion medium. Electronic ink microcapsules containing the polymer particles were prepared by coacervation. The polymer particles had a reversible electric response in the microcapsules under a DC electric field. © Smithers Information Ltd., 2017.

Lai Y.-S.,Swiss Tropical and Public Health Institute | Lai Y.-S.,University of Basel | Zhou X.-N.,National Institute of Parasitic Diseases | Zhou X.-N.,Collaborating Center for Tropical Diseases | And 5 more authors.
PLoS Neglected Tropical Diseases | Year: 2017

Background: Clonorchiasis, one of the most important food-borne trematodiases, affects more than 12 million people in the People’s Republic of China (P.R. China). Spatially explicit risk estimates of Clonorchis sinensis infection are needed in order to target control interventions. Methodology: Georeferenced survey data pertaining to infection prevalence of C. sinensis in P.R. China from 2000 onwards were obtained via a systematic review in PubMed, ISI Web of Science, Chinese National Knowledge Internet, and Wanfang Data from January 1, 2000 until January 10, 2016, with no restriction of language or study design. Additional disease data were provided by the National Institute of Parasitic Diseases, Chinese Center for Diseases Control and Prevention in Shanghai. Environmental and socioeconomic proxies were extracted from remote-sensing and other data sources. Bayesian variable selection was carried out to identify the most important predictors of C. sinensis risk. Geostatistical models were applied to quantify the association between infection risk and the predictors of the disease, and to predict the risk of infection across P.R. China at high spatial resolution (over a grid with grid cell size of 5×5 km). Principal findings: We obtained clonorchiasis survey data at 633 unique locations in P.R. China. We observed that the risk of C. sinensis infection increased over time, particularly from 2005 onwards. We estimate that around 14.8 million (95% Bayesian credible interval 13.8–15.8 million) people in P.R. China were infected with C. sinensis in 2010. Highly endemic areas (≥ 20%) were concentrated in southern and northeastern parts of the country. The provinces with the highest risk of infection and the largest number of infected people were Guangdong, Guangxi, and Heilongjiang. Conclusions/Significance: Our results provide spatially relevant information for guiding clonorchiasis control interventions in P.R. China. The trend toward higher risk of C. sinensis infection in the recent past urges the Chinese government to pay more attention to the public health importance of clonorchiasis and to target interventions to high-risk areas. © 2017 Lai et al.

Yin H.,Tianjin University of Science and Technology | Yin H.,Tianjin Modern Vocational Technology College | Zhang R.,Tianjin University of Science and Technology | Xia M.,Tianjin University of Science and Technology | And 4 more authors.
Microbial Cell Factories | Year: 2017

Background: Acetic acid bacteria (AAB) are widely applied in food, bioengineering and medicine fields. However, the acid stress at low pH conditions limits acetic acid fermentation efficiency and high concentration of vinegar production with AAB. Therefore, how to enhance resistance ability of the AAB remains as the major challenge. Amino acids play an important role in cell growth and cell survival under severe environment. However, until now the effects of amino acids on acetic fermentation and acid stress resistance of AAB have not been fully studied. Results: In the present work the effects of amino acids on metabolism and acid stress resistance of Acetobacter pasteurianus were investigated. Cell growth, culturable cell counts, acetic acid production, acetic acid production rate and specific production rate of acetic acid of A. pasteurianus revealed an increase of 1.04, 5.43, 1.45, 3.30 and 0.79-folds by adding aspartic acid (Asp), and cell growth, culturable cell counts, acetic acid production and acetic acid production rate revealed an increase of 0.51, 0.72, 0.60 and 0.94-folds by adding glutamate (Glu), respectively. For a fully understanding of the biological mechanism, proteomic technology was carried out. The results showed that the strengthening mechanism mainly came from the following four aspects: (1) Enhancing the generation of pentose phosphates and NADPH for the synthesis of nucleic acid, fatty acids and glutathione (GSH) throughout pentose phosphate pathway. And GSH could protect bacteria from low pH, halide, oxidative stress and osmotic stress by maintaining the viability of cells through intracellular redox equilibrium; (2) Reinforcing deamination of amino acids to increase intracellular ammonia concentration to maintain stability of intracellular pH; (3) Enhancing nucleic acid synthesis and reparation of impaired DNA caused by acid stress damage; (4) Promoting unsaturated fatty acids synthesis and lipid transport, which resulted in the improvement of cytomembrane fluidity, stability and integrity. Conclusions: The present work is the study to show the effectiveness of Asp and Glu on metabolism and acid stress resistance of A. pasteurianus as well as their working mechanism. The research results will be helpful for development of nutrient salts, the optimization and regulation of high concentration of cider vinegar production process. © The Author(s). 2017.

Wang L.H.,Tianjin Modern Vocational Technology College | Liu H.,Tianjin Modern Vocational Technology College
Polish Journal of Chemical Technology | Year: 2015

A carbon-based solid acid catalyst was prepared by the sulfonation of carbonized seed shells of Jatropha curcas (J. curcas L.). The structure of amorphous carbon consisting of polycyclic aromatic carbon sheets attached a high density of acidic SO3H groups (2.0 mmol · g-1) was identified with scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) . The performance of the solid acid catalyst was evaluated for biodiesel production in the esterification of oleic acid with methanol. 95.7% yield of biodiesel was obtained after 2 h reaction and the conversions with reused catalyst varied in the range of 95.7% to 95.1%, showing better activity and stability than commercial catalyst amberlyst-46. It was also observed that the prepared catalyst showed enhanced activity in the transesterification of triolein with methanol when compared with other solid acid catalysts. A synergistic effect results from the high density of SO3H groups and the good access of reactants to the acidic sites can be used to explain the excellent catalytic activity, as well as the strong affinity between the hydrophilic reactants and the neutral OH groups bonded to the polycyclic aromatic carbon rings.

Sun H.,Tianjin Modern Vocational Technology College | Liu M.-Q.,China Institute of Technology | Zhang B.-J.,Xuzhou Institute of Technology
Inorganica Chimica Acta | Year: 2016

Two dysprosium compounds with the formula [Dy(TTA)2L] (1) and [Dy2(dbm)2(L)2(CH3OH)2]·2.6CH3OH·0.4CH2Cl2 (2) (TTA = 2-thenoyltrifluoroacetone, dbm = 1,3-diphenyl-1,3-propanedione and HL = N-(methylene-8-hydroxyquinoline)-pyridylhydrazone) based on a multidentate 8-hydroxyquinoline Schiff base have been synthesized, structurally and magnetically characterized. The X-ray structural analysis exhibits that 1 is a mononuclear structure, while 2 is a μ2-O bridged dinuclear complex. Magnetic measurements indicated that different magnetic relaxation behaviors were clearly observed in 1 and 2 under zero-dc field, with the effective barriers (ΔE/kB) of 67.8 K for 1 and 2.67 K for 2. © 2016 Elsevier B.V.

PubMed | Nankai Hospital of Tianjin City, Tianjin University, Tianjin Modern Vocational Technology College and Tianjin Polytechnic University
Type: | Journal: Analytical and bioanalytical chemistry | Year: 2016

Highly efficient extraction of peptides from serum is critical for finding serum biomarkers using mass spectrometry, which still remains a great challenge. Currently,a bottom-up proteomics approach has been applied to discover serum biomarkers. However, the approach was labor intensive, time and cost consuming, and cannot meet the requirements for clinical application. In this work, Fe

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.

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 | Feng X.-Y.,China Pharmaceutical University | Wei J.-P.,Tianjin Modern Vocational Technology College
Journal of Chromatography A | Year: 2015

Novel biocompatible chiral monolithic stationary phase was prepared by reverse and direct atom transfer radical polymerization (ATRP) methods. By taking advantages of the controlled/living property of ATRP method, the chiral monolith was prepared by reverse ATRP (RATRP) firstly. An attractive feature of RATRP is the prepared polymer containing a terminal radically transferable atom that can initiate another post-polymerization reaction by direct ATRP. Then, the biocompatible poly(hydroxyethyl methacrylate) (PHEMA) was grafted on the surface of the chiral monolith by direct ATRP as a diffusion barrier for proteins. This biocompatible chiral monolith was successfully used as restricted access stationary phase for determination of enantiomers in biological samples with direct injection by high-performance liquid chromatography (HPLC). © 2015 Elsevier B.V.

Fu W.,Tianjin Modern Vocational Technology College
Applied Mechanics and Materials | Year: 2014

This paper established a food safety supervision system on the basis of foreign advanced food safety management mode and methods, combining with China's specific national conditions, and strengthen food quality and safety control system, in order to speed up the process of development with international standard is the key problem. Based on the advanced management experience of developed country, this paper put forward a scientific, efficient and dynamic supervision system of food safety. © (2014) Trans Tech Publications, Switzerland.

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