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Ternary Pt/Re/SnO2/C catalyst for EOR:Electrocatalytic activity and durability enhancement

Nano Research 2020年第3期13卷 832-842页

作者： Elzbieta Drzymala Grzegorz Gruze Joanna Depciuch miroslawa Pawlyta Mikołaj Donten Magdalena Parlinska-Wojtan Institute of Nuclear Physics Polish Academy of Sciences PL-31342 KrakowPoland Institute of Engineering Materials and Biomaterials Silesian University of TechnologyGliwice 44-100Poland Faculty of Chemistry University of WarsawWarsaw 02-093Poland

Carbon-supported Pt/C,Pt/Re/C,Pt/SnO2/C and Pt/Re/SnO2/C,with 20 wt.%overall metal loading were prepared and their electrochemical activity towards ethanol oxidation reaction(EOR)was *** electron microscopy(TEM)combined with energy dispersive X-ray spectroscopy(EDS)revealed,that indeed binary and ternary combinations of the designed nanoparticles(NPs)were formed and successfully uniformly deposited on a carbon *** transform infrared spectroscopy(FTIR)allowed to assess the chemical composition of the nanocatalysts and X-ray diffraction(XRD)allowed to determine the catalyst *** and chronoamperometric measurements were used to establish its catalytic activity and *** influence of Re addition on the electrochemical activity towards ethanol oxidation reaction(EOR)was ***,the addition of Re to the binary Pt/SnO2/C catalyst leads to the formation of ternary Pt/Re/SnO2/C with physical contact between the individual NPs,enhancing the ***,the onset potential of the synthesized ternary catalyst is shifted to more negative potentials and the current densities and specific activity are nearly 11 and 5 times higher,respectively,than for commercial Pt *** ternary Pt/Re/SnO2/C catalyst retained 96%of its electrochemical surface area.

关键词： chemical synthesis transmission electron microscopy(TEM)characterization electrochemistry ethanol oxidation reaction(EOR) Pt/Re/SnO2/C catalysts ternary catalysts

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Global methylation status of sperm DNA in carriers of chromosome structural aberrations

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Asian Journal of Andrology 2017年第1期19卷 117-124页

作者： Marta Olszewska miroslawa z.barcisz.wska Monika Fraczek Nataliya Huleyuk Vyacheslav B chernykh Danuta zastavna Jan barciszewski Maciej Kurpisz Department of Reproductive Biology and Stem Cells Institute of Human Genetics Polish Academy of Sciences Strzeszynska 32 60-479 Poznan Poland Department of RNA Biology Institute of Bioorganic Chemistry Polish Academy of Sciences Noskowskiego 12/14 61-704 Poznan Poland Institute of Hereditary Pathology Ukrainian Academy of Medical Sciences Lysenko Street 31a 79000 Lviv Ukraine Research Centre for Medical Genetics Russian Academy of Medical Sciences Moskvorechie Street 1115478 Moscow Russian Federation.

Male infertility might be clearly associated with aberrant DNA methylation patterns in human spermatozoa. An association between oxidative stress and the global methylation status of the sperm genome has also been suggested. The aim of the present study was to determine whether the global sperm DNA methylation status was affected in the spermatozoa of carriers of chromosome structural aberrations. The relationships between the 5-methylcytosine （msC） levels in spermatozoa and chromatin integrity status were evaluated. The study patients comprised male carriers of chromosome structural aberrations with reproductive failure （n = 24）, and the controls comprised normozoospermic sperm volunteers （n = 23）. The global msC level was measured using thin-layer chromatography （TLC） and immunofluorescence （IF） techniques. The sperm chromatin integrity was assessed using aniline blue （AB） staining and TUNEL assay. The mean msC levels were similar between the investigated chromosome structural aberrations carriers （P） and controls （K）. However, sperm chromatin integrity tests revealed significantly higher values in chromosomal rearrangement carriers than in controls （P 〈 0.05）. Although the potential relationship between sperm chromatin integrity status and sperm DNA fragmentation and the msC level juxtaposed in both analyzed groups （P vs K） was represented in a clearly opposite manner, the low chromatin integrity might be associated with the high hypomethylation status of the sperm DNA observed in carriers of chromosome structural aberrations.

关键词： 5-methylcytosine chromatin integrity chromosomal rearrangement chromosome translocation global DNA methylation male infertility

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