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Articles by Xin Liu
Total Records ( 11 ) for Xin Liu
  Xin Liu , Qi Wang and Liu-Ping Chen
  Recent studies show that the self-assembled monolayer (SAM) is well suited to control the selectivity of chemical vapor deposition (CVD). Here, we reported the selective CVD for copper on the functionalized SAM surfaces (with –SH, –SS–, and –SO3H terminal groups). The –SS– and –SO3H terminal group surfaces were obtained through in situ chemical transformation of –SH terminal group surface of a 3-mercaptopropyltrimethoxysilane-SAM (MPTMS-SAM). As a result, the –SS– terminal group surface reduces copper deposition and the –SO3H terminal group surface enhances copper deposition comparing to the –SH terminal group surface. In addition, the MPTMS-SAM was irradiated by UV-light through a photo mask to prepare SH-group and OH-group regions. Then, copper films were deposited only on the SH-group region of the substrate in chemical vapor deposition. Finally, patterns of copper films were formed in the way of UV-light irradiation. These results are expected for use of selective deposition of copper metallization patterns in IC manufacturing processes.
  Zhaowei Meng and Xin Liu
  Hough Transform is a regularly used method in thermometer detection. It can effectively extract line segments and curves in images. This thesis mainly applies the algorithm of extracting thermometer scale lines by Hough Transform and improves the searching distance and range to improve operating efficiency.
  Monika Dzieciatkowska , Xin Liu , Astrid P. Heikema , R. Scott Houliston , Alex van Belkum , Elke K. H. Schweda , Michel Gilbert , James C. Richards and Jianjun Li
  Campylobacter jejuni lipooligosaccharide (LOS) can trigger Guillain-Barré syndrome (GBS) due to its similarity to human gangliosides. Rapid and accurate structural elucidation of the LOS glycan of a strain isolated from a GBS patient could help physicians determine the spectrum of anti-ganglioside antibodies likely to be found and therefore provide valuable assistance in establishing an appropriate course of treatment. The ability of implemented mass spectrometry-based approaches in a clinical setting has been limited by the laborious and time-consuming nature of the protocols, typically 3 to 4 days, used to prepare LOS. In order to improve the analytical throughput, microwave-assisted enzymatic digestion was investigated. In this study, the bacterial cells were suspended in 50 µl of 20 mM ammonium acetate buffer containing DNase and RNase and treated by direct microwave irradiation for 3 min. Then, proteinase K was added and the samples were again microwaved. The intact LOS samples were analyzed using electrophoresis-assisted open-tubular liquid chromatography-mass spectrometry. The reliability of the rapid, high-throughput technique was demonstrated through analysis of LOS glycans from 73 C. jejuni strains. The structure was elucidated using material from a single colony. The total time for sample preparation and MS analysis is less than 60 min.
  Mei-Ling Liu , Li-Zhi Zhang , Xiu-Ping Sun , Zhen-Ping Ma , Wen Gu and Xin Liu
  A dinuclear complex Cu2(bpca)2(H2O)2(Ag2(CN)3) (1) and a 1D complex [Cu2(bpca)2(H2O)2(Au(CN)2)2]n (2) (bpca = bis(2-pyridylcarbonyl)amide anion) have been prepared, structurally characterized and 2 has been magnetically characterized. The magnetic properties show an antiferromagnetic interaction between the two Cu(II) ions. Based on the Hamiltonian Hcirc = -2J Σ (Si · Si+1), best fitting for the experimental data leads to J = -0.045 cm-1.
  Jie Qu , Wen Gu and Xin Liu
  An octacyanometalate-bridged complex, [Ni(en)2(H2O)W(CN)8][Ni(en)3] · 2H2O, has been prepared and characterized and the magnetic properties studied. The complex was characterized using IR, elemental analysis and UV-Vis. The magnetic susceptibility measured over the range 1.8-300 K shows antiferromagnetic interaction.
  Pei-Pei Yang , Li Feng , Wen Gu , Xin Liu and Shi-Ping Yan
  A 1D complex [lcub[Cu2([12]aneN3)2(p-paa)(H2O)2](ClO4)2rcub[Cu2([12]aneN3)2(p-paa)2]]n ([12]aneN3 = 1,5,9-triazacyclododecane, p-paa = p-benzenebicarboxylate) has been synthesized and structurally characterized. The complex contains two different binuclear copper(II) moieties. One part includes a binuclear copper(II) unit and non-coordinated perchlorate anions. A neutral binuclear copper(II) part which forms a zigzag chain structure via the bridging p-paa ligand completes the unit-cell. Elemental analysis, IR, UV-Vis spectra and magnetic properties for the complex have also been determined. Magnetic susceptibilities in the solid state are measured over the temperature range from 77 to 300 K, showing a weak antiferromagnetic coupling with a best fit J1 = -3.09 cm-1, J2 = -5.279 cm-1, g = 2.099 and R = 1.226 times 10-5.
  Mei-Ling Liu , Wen Gu , Zhen-Ping Ma , Ping Zhu , Yue-Qiang Gao and Xin Liu
  Two new dinuclear copper(II) complexes, [Cu2(bpca)2(WO4) (H2O)2] · H2O (1) and [Cu2(bpca)2(MoO4) (H2O)2] · H2O (2) [bpca = bis(2-pyridylcarbonyl)amide anion], have been synthesized and their magnetic behavior investigated as a function of temperature. The structures of 1 and 2 have been determined by single-crystal X-ray diffraction. Complexes 1 and 2 are both 3D supramolecules with intermolecular hydrogen-bonding and p-p stacking interactions. The magnetic susceptibilities measured over the range 2-300 K show ferromagnetic interaction between the two copper(II) ions in 1, while there is antiferromagnetic interaction between the two copper(II) ions in 2. Based on the Hamiltonian written as Ĥ = -2JS1 .S2, best fitting for the experimental data leads to J = 0.557 cm-1 (1) and -77.2 cm-1 (2).
  Jiang-Yun Wang , Pei-Pei Yang , Wen Gu , Wen-Zhen Wang , Xin Liu and Dai-Zheng Liao
  A mononuclear ruthenium(III) complex containing ethylenediaminetetraacetate (edta), [Ru(Hedta)(Htrz)] · 4H2O (1) (Htrz = 1H-1,2,4-triazole), has been synthesized and the structure was determined by single-crystal X-ray diffraction. The complex crystallizes in the triclinic space group P1, with the unit cell parameters a = 7.212(3) , b = 9.873(4) , c = 13.806(6) , α = 91.945(6)°, β = 100.078(6)°, γ = 97.230(7) and Z = 2. The complex was also characterized by elemental analysis, IR, UV-Vis and ESR spectra. Cyclic voltammetry for the complex shows a ruthenium(III)/ruthenium(IV) oxidation and a ruthenium(III)/ruthenium(II) reduction within the range of -1.5-0.5 V. Magnetic susceptibility data give an effective moment of 1.81 B.M. at room temperature.
  Jiang-Yun Wang , Wen Gu , Wen-Zhen Wang , Xin Liu and Dai-Zheng Liao
  A ruthenium(III) complex containing ethylenediaminetetraacetate (edta), [{Ru(Hedta)}2(Pyz)] · 8H2O (1) (Pyz = pyrazine), has been synthesized by the reaction between K[Ru(Hedta)Cl] · 1.5H2O and pyrazine. The structure of the complex was determined by single X-ray diffraction. Complex 1 crystallizes in the triclinic space group P -1 with a = 7.293(9) Å, b = 10.575(14) Å, c = 12.742(16) Å, α = 104.044(19)°, β = 91.893(19)°, γ = 93.35(2)°, Z = 1. The product was also characterized by IR, UV-Vis, EPR spectrum and magnetic techniques.
  Qingling Li , Hui Zhang , Yan Wang , Bo Tang , Xin Liu and Xiaocong Gong
  A versatile programmable eight-path-electrode power supply (PEPS) system for manipulating microfluids of a complex microfluidic chip has been developed. The PEPS system consisted of a single chip microprocessor as a central control unit and a personal computer (PC) as an upper computer, and the program could be operated under Windows98/2000/XP. The voltage output of each electrode was in the range of 0 to +8000 V (0.1% precision) while the current output was in the range of 0 to +999 μA. The voltage of eight electrodes could be operated either independently or synchronously by random combination of any electrodes through switching. The voltage output modes were “switch-off/floating”, “switch-on” and “grounded” and fast switched at ms-level between these modes, and run time (0.1 s precision) of these modes could be controlled as desired. The PEPS system was conveniently for controlling flow rate and direction of electroosmotic flow (EOF) in a chip network. Six electrodes were chosen to control the repeated ‘injection and separation’ of 1.0 x 10–5 M fluorescein isothiocyanate (FITC) in a six-reservoir glass-based chip. The relative standard deviation (R.S.D., n = 4, S/N = 10) of the repeated operation was 0.9% for the reservation time (tR) and 2.3% for the peak height, respectively.
  Xin Liu , Dezheng Zhao , Liuliang Qin , Jian Li and Huiyan Zeng
  The Down syndrome candidate region 1 gene (DSCR1) can be expressed as four isoforms, one of which is the well-studied isoform 4 (DSCR1-4) that is induced by VEGF-A165 to provide a negative feedback loop in the VEGF-A165-induced angiogenesis. We reported previously that another DSCR1 isoform, DSCR1-1L, was also up-regulated by VEGF-A165 in cultured endothelial cells and in several in vivo models of pathological angiogenesis and that different from DSCR1-4, DSCR1-1L overexpression alone induced cultured endothelial cell proliferation and promoted angiogenesis in Matrigel assays. It was reported recently that tumor growth was greatly repressed in DSCR1 knock-out mice. Although DSCR1-4 transcription was primarily regulated by NFAT, the mechanism regulating DSCR1-1L expression was still unknown. We developed human DSCR1-1L promoter-driven luciferase system and found that deletion of a putative conserved M-CAT site located 1426-bp upstream of the translation start site blunted promoter activity. We further showed that knockdown of TEF3, not other members of TEF family inhibited VEGF-A165-induced DSCR1-1L expression. We also demonstrated that TEF3 directly interacted with the putative M-CAT site in the DSCR1-1L promoter in vitro and in vivo. Finally, overexpression of TEF3 isoform 1, not isoform 3, in HUVEC was sufficient to induce DSCR1-1L expression even in the absence of VEGF-A165 stimulation. Taken together, we elucidated a novel function of transcriptional factor TEF3. TEF3 was required for DSCR1-1L expression through binding to the M-CAT site in its promoter and could be an attractive target for anti-angiogenesis therapy.
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