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RISS 인기검색어
- 검색키워드
- 저자 : Zhinan Yan (검색결과 2 건)
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Catalytic oxidation of sulfur dioxide over -Fe2O3/SiO2 catalyst promoted with Co and Ce oxides
Zhinan Yan,Yong Kang,Dan Li,Yu Chun Liu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
Hematite (-Fe2O3) is a promising alternative to the catalysts currently used due to its low cost, fairly good activity and environmentally friendly properties. In this study, -Fe2O3/SiO2 nanocatalysts promoted with cobalt and cerium (Co3O4-CeO2--Fe2O3/SiO2) were prepared via wet co-impregnation method, and the effects of promoters on catalytic performances for SO2 oxidation at different temperatures, SO2 concentrations, cycle numbers, catalytic stability as well as catalyst charging were investigated. The results indicated that SO2 conversion rose with the increasing of catalyst charging and SO2 concentration. Also, the as-prepared catalyst had the maximum SO2 conversion at the reaction temperature of 500 oC, excellent catalytic recyclability and activity stability. Its physicochemical and redox properties were characterized by XRD, BET, SEM, FT-IR and XPS. The results of XRD and FT-IR spectra confirmed that the formation of Ce2FeO4 network in the Co-Ce co-doped catalysts proved the promoting effect of cerium on higher valence state of the active ingredient. The N2 adsorption/desorption results evidenced that cerium could increase the proportion of mesoporous, and the XPS spectra indicated that cobalt and cerium in the catalysts could increase the available oxygen (O/O) for the redox reaction. Due to its excellent low onset temperature, fairly good activity and environmentally friendly properties, the as-prepared catalyst of Co3O4-CeO2--Fe2O3/SiO2 appeared to be more efficient for the SO2 conversion in a large concentration range.
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Yongwei Lai,Zhao He,Aowei Zhang,Zhinan Yan,Xiao Zhang,Shiyue Hu,Nan Wang,Hongpeng He 한국유전학회 2020 Genes & Genomics Vol.42 No.6
Background High-risk HPV is a causative factor of cervical cancer. HPV DNA fragments integrate into host genome resulting in the constitutive expression of HPV genes E6 and E7 under the regulation of transcription factors, such as p300 and Tip60. Interestingly, Tip60, a factor with HAT (histone acetyl transferase) activity, represses HPV18 E6/E7 genes while another HAT p300 activates the transcription of HPV18 E6/E7. Objective To explore the mechanism for the opposite roles of Tip60 and p300 in the virus gene regulation, and the influence of Tip60 and p300 in histone modifications in the regulatory sequence of HPV18 genes. Methods Tip60 or p300 was either knocked down or overexpressed in HeLa cells. The effects on HPV E6E7 expression were determined with RT-qPCR. The association of RNA polymerase II and the enrichment of acetylated or methylated histones in HPV promoter region were measured by ChIP assays with specific antibodies. Results ChIP results showed that Tip60 and p300 differently affected the modifications of histone H3K9 and the deposition of nucleosomes in HPV18 long control region (LCR). HPV18 LCR in HeLa cells is bivalent chromatin carrying both the active histone H3K9 acetylation mark and the repressive histone H3K9 trimethylation mark, the balance is maintained by Tip60 and p300. Conclusion(s) Based on the roles of Tip60 and p300 in HPV gene regulation, chemical compounds targeting Tip60 or p300 are potential anti-cervical cancer drugs.
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