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Facile design of Au@Pt core-shell nanostructures： Formation of Pt submonolayers with tunable coverage and their applications in electrocatalysis

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Nano Research 2014年第3期7卷 410-417页

作者： fulin zheng wing-tak wong ka-fu yung Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Hong Kong SAR China

A facile design of Pt nanostructures from submonolayer to monolayer has been realized by ion adsorption-in situ electrochemical reduction on Au nanoparticles supported on multiwall carbon nanotubes （CNTs）. The as prepared Au@Pt/CNTs catalysts display coverage-specific electrocatalysis. Au@Pt/CNTs with low Pt coverage is inactive towards methanol oxidation whereas it oxidizes formic acid effectively through a direct pathway with mass specific activity 90 times that of a commercial Pt/C catalyst. Due to its inertness to methanol, it shows high performance in the oxygen reduction reaction （ORR） with high methanol tolerance. In contrast, simply increasing the Pt coverage to above 40% switches the formic acid oxidation process to both direct and indirect catalytic pathways, and also results in high methanol oxidation activity.

关键词： electrocatalysis platinum submonolayer fuel cell

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Tumor necrosis factor-α-induced protein 1 and immunity to hepatitis B virus

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World Journal of Gastroenterology 2005年第48期11卷 7564-7568页

作者： Marie C Lin Nikki P Lee Ning zheng Pai-Hao Yang Oscar G wong Hsiang-fu Kung Chee-Kin Hui John M Luk George ka-Kit Lau Institute of Molecular Biology The University of Hong KongHong Kong SAR China Department of Surgery The University of Hong Kong Hong Kong SAR China Center for the Study of Liver Diseases The University of Hong Kong Hong Kong SAR China Department of Medicine The University of Hong Kong Hong Kong SAR China

AIM: To compare the gene expression profile in a pair of HBV-infected ***: The gene expression profile was compared in a pair of HBV-infected ***: The twins displayed different disease outcomes. One acquired natural immunity against HBV,whereas the other became a chronic HBV carrier. Eightyeight and forty-six genes were found to be up- or downregulated in their PBMCs, respectively. Tumor necrosis factor-alpha-induced protein 1 (TNF-αIP1) that expressed at a higher level in the HBV-immune twins was identified and four pairs of siblings with HBV immunity by RTPCR. However, upon HBV core antigen stimulation,TNF-αIP1 was downregulated in PBMCs from subjects with immunity, whereas it was slightly upregulated in HBV carriers. Bioinformatics analysis revealed a K+channel tetramerization domain in TNF-αIP1 that shares a significant homology with some human, mouse, and C elegan ***: TNF-αIP1 may play a role in the innate immunity against HBV.

关键词： TNF-α HBV Immunity

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