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Articles by Bin Liu
Total Records ( 9 ) for Bin Liu
  Lianjun Liu , Bin Liu , Lihui Dong , Jie Zhu , Haiqin Wan , Keqin Sun , Bin Zhao , Haiyang Zhu , Lin Dong and Yi Chen
  In situ FT-IR was employed to investigate CO or/and NO interaction with CuO supported on Ce0.67Zr0.33O2 (hereafter denoted as CZ) catalysts. The physicochemical properties of CuO–CZ were also studied by combination of XRD, TPR and NO + CO activity tests. The results indicated that the dispersed CuO species were the main active components for this reaction. The catalysts showed different activities and selectivities at low and high temperatures, which should be resulted from the reduction of dispersed copper oxide species. This reaction went through different mechanisms at low and high temperatures due to the change of active species. FT-IR results suggested: (1) CO was activated by oxygen originating from CZ support, which led to surface carbonates formation, and partial dispersed CuO was reduced to Cu+ species above 150 °C; (2) NO interacted with the dispersed CuO and formed several types of nitrite/nitrate species, whereas crystalline CuO made little contribution to the formation of new NO adsorbates; (3) NO was preferentially adsorbed on CuO–CZ catalysts compared with CO in the reactants mixture. These adsorbed nitrite/nitrate species exhibited different thermal stability and reacted with CO at 250 °C. As a result, a possible mechanism was tentatively proposed to approach NO reduction by CO over CuO–CZ catalyst.
  Rong Zhang , Sifeng Liu and Bin Liu
  Based on multi-grade dominance relations, this study develops a new multi-criterion decision model, which can avoid losing information when decision table is changed into PCT and obtain complete ranking of alternatives. The model introduces PROMETHEE II into dominance-based rough set theory and with different preference grades for different criterions, describes binary preference relations of two objects. Meanwhile, the model resolves the problem of some alternatives having the same net flow value, which is a common problem when rough set method is applied to MCDA. Finally, an example illustrates the model is scientific and validity.
  Yumei Wu , Weipeng Wang , Zhengwei Yu and Bin Liu
  A method to model IMA software dynamic reconfiguration with AADL and verify the model’s deadlock-free with Petri Net are proposed. Compared with current research, the model can describe the reconfiguration caused by both fault tolerance and requirement change and the verification has good performance on checking deadlock-free of AADL model. This paper gives some basic concepts of IMA dynamic reconfiguration and AADL behavior annex, presents the method of modeling IMA reconfiguration with AADL, the model transformation and the verification of its deadlock-free using Petri Net.
  Lu Feng , Bin Liu , Yanqun Liu , Yuli A. Ratiner , Bo Hu , Dan Li , Xiaolin Zong , Wei Xiong and Lei Wang
  The occurrence of unilateral flagellar phase variation was previously demonstrated in Escherichia coli strains carrying the non-fliC flagellin-specifying locus flk. In this study, we investigated the mechanism involved in this process. By using sequencing and sequence analysis, the flk region between the chromosomal genes yhaC and rnpB was characterized in all described flk-positive E. coli strains, including the H35 strain identified in this study (the other strains used are H3, H36, H47, and H53 strains), and this region was found to contain a putative integrase gene and flanking direct repeats in addition to the flk flagellin-specifying gene flkA and a fliC repressor gene, flkB, indicating that there is a typical genomic islet (GI), which was designated the flk GI. The horizontal transfer potential of the flk GI was indicated by detection of the excised extrachromosomal circular form of the flk GI. By generating fliC-expressing variants of H3 and H47 strains, unilateral flagellar phase variation in flk-positive strains was shown to be mediated by excision of the flk GI. The function of the proposed integrase gene was confirmed by deletion and a complementation test. The potential integration sites of the flk GI were identified. A general model for flagellar phase variation in flk-positive E. coli strains can be expressed as fliCoff + flkAonfliCon + flkAnone. This is the first time that a molecular mechanism for flagellar phase variation has been reported for E. coli.
  Inka Brockhausen , Bo Hu , Bin Liu , Kenneth Lau , Walter A. Szarek , Lei Wang and Lu Feng
  The O antigens of outer membrane-bound lipopolysaccharides (LPS) in gram-negative bacteria are oligosaccharides consisting of repeating units with various structures and antigenicities. The O56 and O152 antigens of Escherichia coli both contain a Glc-β1-3-GlcNAc linkage within the repeating unit. We have cloned and identified the genes (wfaP in O56 and wfgD in O152) within the two O-antigen gene clusters that encode glucosyltransferases involved in the synthesis of this linkage. A synthetic substrate analog of the natural acceptor substrate undecaprenol-pyrophosphate-lipid [GlcNAc-α-PO3-PO3-(CH2)11-O-phenyl] was used as an acceptor and UDP-Glc as a donor substrate to demonstrate that both wfgD and wfaP encode glucosyltransferases. Enzyme products from both glucosyltransferases were isolated by high-pressure liquid chromatography and analyzed by nuclear magnetic resonance. The spectra showed the expected Glc-β1-3-GlcNAc linkage in the products, confirming that both WfaP and WfgD are forms of UDP-Glc: GlcNAc-pyrophosphate-lipid β-1,3-glucosyltransferases. Both WfaP and WfgD have a DxD sequence, which is proposed to interact with phosphate groups of the nucleotide donor through the coordination of a metal cation, and a short hydrophobic sequence at the C terminus that may help to associate the enzymes with the inner membrane. We showed that the enzymes have similar properties and substrate recognition. They both require a divalent cation (Mn2+ or Mg2+) for activity, are deactivated by detergents, have a broad pH optimum, and require the pyrophosphate-sugar linkage in the acceptor substrate for full activity. Substrates lacking phosphate or pyrophosphate linked to GlcNAc were inactive. The length of the aliphatic chain of acceptor substrates also contributes to the activity.
  Jun Wang , Dan Li , Jingqun Gao , Bin Liu , Baoxin Wang , Dan Wang , Tingting Fan and Xiangdong Zhang
  Two complexes, (enH2)3[TbIII(ttha)]2 · 11H2O (1) (en = ethylenediamine and H6ttha = triethylenetetramine-N, N, N ', N '', N ''', N '''-hexaacetic acid) and (enH2)[TbIII(pdta)(H2O)]2 · 8H2O (2) (H4pdta = propylenediamine-N, N, N ', N '-tetraacetic acid), were synthesized and characterized by elemental analysis, infrared spectrum, UV-Vis spectrum, fluorescence spectrum, and single-crystal X-ray diffraction. The central TbIII of 1 is nine-coordinate, pseudo-monocapped square antiprism with four nitrogens and five oxygens from one ttha, and crystallizing in the monoclinic crystal system with P21/n space group. There is a free (non-coordinate) carboxylate (-CH2COO-) in the [TbIII(ttha)]3-. The central TbIII of 2 is eight-coordinate in a standard square antiprism with two nitrogens and four oxygens of one pdta, one oxygen from a carboxylate of an adjacent pdta, and one oxygen from water, crystallizing in the monoclinic crystal system with C2/c space group. Binding between the enH22+ with [TbIII(ttha)]3- or [TbIII(pdta)(H2O)]- is reviewed, providing the basis for interaction of TbIII complexes with biomolecules.
  Hui-Lu Wu , Kai-Tong Wang , Fan Kou , Fei Jia , Bin Liu , Jing-Kun Yuan and Ying Bai
  A V-shaped ligand 1,3-bis(1-ethylbenzimidazol-2-yl)-2-thiapropane (L) and its picrate cadmium(II) complex have been synthesized and characterized systematically. In [Cd(L)2](pic)2, the Cd(II) is six-coordinate with N4S2 donors of two ligands, forming a slightly distorted octahedron. DNA binding properties were investigated by electronic absorption spectroscopy, fluorescence spectroscopy, and viscosity measurements. The compounds bind to DNA via intercalation and the order of binding affinity is ligand>complex.
  Xiaojian Wang , Bin Liu , Nan Li , Hongzhe Li , Jianming Qiu , Yuanyuan Zhang and Xuetao Cao
  Protein phosphatase 1 (PP1) is a major serine/threonine phosphatase that controls gene expression and cell cycle progression. Here we describe the characterization of a novel inhibitory molecule for PP1, human inhibitor-5 of protein phosphatase 1 (IPP5). We find that IPP5, containing the PP1 inhibitory subunits, specifically interacts with the PP1 catalytic subunit and inhibits PP1 phosphatase activity. Furthermore, the mutation of Thr-40 within the inhibitory subunit of IPP5 into Ala eliminates the phosphorylation of IPP5 by protein kinase A and its inhibitor activity to PP1, whereas the mutation of Thr-40 within a truncated form of IPP5 into Asp can serve as a dominant active form of IPP5 in inhibiting PP1 activity. In IPP5-negative SW480 and IPP5-highly positive SW620 human colon cancer cells, we find that overexpression of IPP5 promotes the growth and accelerates the G1-S transition of SW480 cells in a Thr-40-dependent manner, which could be reversed by downregulation of the PP1 expression. Moreover, silencing of IPP5 inhibits the growth of SW620 cells both in vitro and in nude mice possibly by inducing G0/G1 arrest but not by promoting apoptosis. According to its role in the promotion of cell cycle progression and cell growth, IPP5 up-regulates the expression of cyclin E and the phosphorylated form of retinoblastoma protein. Our findings suggest that IPP5, by acting as an inhibitory molecule for PP1, can promote tumor cell growth and cell cycle progression, and may be a promising target in cancer therapeutics in IPP5-highly expressing tumor cells.
  Xiangying Sun , Bin Liu , Ping Hu and Wenying Hu
  Fluorescent dye Acridine Orange (AO) was indirectly assembled onto the surface of colloidal gold nanoparticles modified quartz and gold wafer, with cysteine as mediation. Strong fluorescence emission was observed from AO self-assembled multilayers. Formation of the self-assembled multilayers was confirmed and primarily characterized by electrochemical and fluorescence methods. The effect of assembling substrate on fluorescence intensity of the film was discussed. The self-assembled multilayers offer a high sensitive interfacial fluorescence sensing of deoxyribonucleic acid with the detection limit of 7.145 x 10- 9 g L- 1 (3 S.D./K), which was five orders of magnitude lower than that of the bulk solution-phase. The self-assembled multilayers film has higher stability and good regeneration capacity.
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