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Ankang, China

Wen Y.-N.,Ankang University
Central European Journal of Physics | Year: 2014

The surface relaxation and the formation of a single vacancy in very thin Cu (001) film formed by 2 ~ 14 atomic layers have been studied by using MAEAM and MD simulation. For the surface relaxtion, the highest surface energy is in the l = 2 atomic layers. The multilayer relaxation mainly occurs between the first two atomic layers, and the maximum contractive displacement is obtained in the very thin Cu (001) film formed by l = 3 atomic layers. For the vacancy formed in l′ = 1 of the very thin Cu (001) film formed by l = 2 ~ 14 layers, the most difficult site in the film formed by l = 3 atomic layers. © 2014 Versita Warsaw and Springer-Verlag Wien.

We report on a new scheme for the determination of the activity of caspase-3 using a specific peptide labeled with N-(4-aminobutyl)-N-ethylisoluminol (ABEI) as a chemiluminescent (CL) probe and on the development of magnetic separation technology. Firstly, the ABEI-labeled and biotinylated peptide was prepared and conjugated to streptavidin-coated magnetic beads (MBs) to form f-MBs (functionalized magnetic beads). The f-MBs contain a site (DEVD, Asp-Glu-Val-Asp) that is cleaved by caspase-3. Upon cleavage, the terminal residue attached to ABEI can dissociate from the f-MBs and can be used for CL detection. CL intensity is linearly related to the concentration of caspase-3 in the range 1. 0 to 600 ng mL -1, with a detection limit of 0. 3 ng mL -1. The relative standard deviation of the assay is 3. 6 % at a level of 50 ng mL -1 of caspase-3 (for n = 11). The CL assay has been applied to the determination of caspase-3 in Jurkat cell extract with recoveries between 96. 6 % and 106. 1 % (n = 5). © 2012 Springer-Verlag.

Zhu Y.,Ankang University
Advanced Materials Research | Year: 2013

This paper analyzed efficiency performance of two most popular charge pumps: Linear Dickson charge pump and the Exponential Dickson charge pump. The analysis result indicated that in a certain range, exponential charge pump had a much higher efficiency than the linear one. With this analysis result, a novel exponential charge pump was proposed. The simulation result shows the proposed charge pump has a 18.4% improvement in efficiency. © (2013) Trans Tech Publications, Switzerland.

Wang Y.-W.,Ankang University
Jiegou Huaxue | Year: 2011

A new one-dimensional double chain coordination polymer, [Na(cbsH)(H 2O)3]n (cbsH = 4-carboxy-benzenesulfonic anion), has been synthesized by aqueous reaction, structurally described, and thermally characterized. It crystallizes in the triclinic system, space group P1 with a = 5.645(4), b = 7.905(5), c = 13.043(8) Å, α = 89.391(7), β = 80.637(7), γ = 82.845(7)°, V = 569.8(6) Å3, Z = 2, C7H11NaO8S, Mr = 278.21, Dc = 1.622 Kg/m3, F(000) = 288, R = 0.0260 and wR = 0.0697. The title compound consists of one-dimensional double chains. 4-Carboxy-benzenesulfonic acid acts as a bridging bidentate ligand to link two sodium(I) ions to form a binuclear structure. Remarkably, the sodium(I) ion behaves as a metal bridge so that the binuclear structure units are connected to construct a one-dimensional double chain polymer. Furthermore, a 3-D framework is assembled through intermolecular hydrogen bonds. Thermogravimetric analysis shows that this compound begins losing the free solvent molecules at 106 °C and decompounding completely at 580 °C.

A novel mercury(II) ion (Hg2+) biosensor with electrogenerated chemiluminescence (ECL) detection using tris(2,2'-bipyridyl) ruthenium derivatives (ruthenium complex) as labeling was developed in the prescent work. One thymine (T)-rich single-strand DNA (ssDNA) labeled with a ruthenium complex was taken as an ECL probe. When the other T-rich capture ssDNA was self-assembled onto the surface of a gold electrode with a thiol group, and then hybridized with the ECL probe to form double-strand DNA (dsDNA) structures in the presence of Hg2+, a strong ECL response was electrochemically generated. The ECL intensity was linearly related to the concentration of Hg2+ in the range from 1.0 × 10-6 to 1× 10-9 M with a detection limit of 3.0 × 10-10 M. The relative standard deviation was 4.1% at 1.0 × 10-7 M Hg2+ (n = 5). This work demonstrates that the combination of the strongly binding T-rich DNA to Hg2+ with the highly sensitive ECL technique to design an ECL Hg2+ biosensor is a great promising approach for the determination of metal ions. © 2011 The Japan Society for Analytical Chemistry.

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