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CO₂ Reforming of Methane over Ni on MgO-Precoated Al₂O₃
Liu, Zhong-Wen,Roh, Hyun-Seog,Jun, Ki-Won,Potdar, H. S.,Ji, Min 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
The effects of MgO loading and calcination temperature of the catalysts on the carbon dioxide reforming of methane (CDR) have been extensively investigated over Ni/MgO/Al₂0₃ catalysts in a fixed-bed reactor system. Results indicate that the activity and stability of the catalysts were significantly influenced by both MgO loading and calcination temperature, i.e., higher calcination temperature and higher MgO loading are essential for high activity and stability of the catalyst. Characterization results indicate that mixed spinel phase composed of MgA1₂0 ^4 and NiAl₂O^4 is effective to produce active and stable Ni species having strong Ni to support interaction resulting in active and stable catalytic performance in CDR.
Molecular Cloning and Bioinformatic Analysis of SPATA4 Gene
Liu, Shang-Feng,Ai, Chao,Ge, Zhong-Qi,Liu, Hai-Luo,Liu, Bo-Wen,He, Shan,Wang, Zhao Korean Society for Biochemistry and Molecular Biol 2005 Journal of biochemistry and molecular biology Vol.38 No.6
Full-length cDNA sequences of four novel SPATA4 genes in chimpanzee, cow, chicken and ascidian were identified by bioinformatic analysis using mouse or human SPATA4 cDNA fragment as electronic probe. All these genes have 6 exons and have similar protein molecular weight and do not localize in sex chromosome. The mouse SPATA4 sequence is identified as significantly changed in cryptorchidism, which shares no significant homology with any known protein in swissprot databases except for the homologous genes in various vertebrates. Our searching results showed that all SPATA4 proteins have a putative conserved domain DUF1042. The percentages of putative SPATA4 protein sequence identity ranging from 30% to 99%. The high similarity was also found in 1 kb promoter regions of human, mouse and rat SPATA4 gene. The similarities of the sequences upstream of SPATA4 promoter also have a high proportion. The results of searching SymAtlas (http://symatlas.gnf.org/SymAtlas/) showed that human SPATA4 has a high expression in testis, especially in testis interstitial, leydig cell, seminiferous tubule and germ cell. Mouse SPATA4 was observed exclusively in adult mouse testis and almost no signal was detected in other tissues. The pI values of the protein are negative, ranging from 9.44 to 10.15. The subcellular location of the protein is usually in the nucleus. And the signal peptide possibilities for SPATA4 are always zero. Using the SNPs data in NCBI, we found 33 SNPs in human SPATA4 gene genomic DNA region, with the distribution of 29 SNPs in the introns. CpG island searching gives the data about CpG island, which shows that the regions of the CpG island have a high similarity with each other, though the length of the CpG island is different from each other.This research is a fundamental work in the fields of the bioinformational analysis, and also put forward a new way for the bioinformatic analysis of other genes.
CO₂ Reforming of Methane over Ni on MgO-Precoated Al₂O₃
Zhong-Wen Liu,Hyun-Seong Roh,전기원,H. S. Potdar,Min Ji 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
The effects of MgO loading and calcination temperature of the catalysts on the carbon dioxide reforming of methane (CDR) have been extensively investigated over Ni/MgO/Al2O3 catalysts in a fixed-bed reactor system. Results indicate that the activity and stability of the catalysts were significantly influenced by both MgO loading and calcination temperature, i.e., higher calcination temperature and higher MgO loading are essential for high activity and stability of the catalyst. Characterization results indicate that mixed spinel phase composed of MgAl2O4 and NiAl2O4 is effective to produce active and stable Ni species having strong Ni to support interaction resulting in active and stable catalytic performance in CDR.
Important Factors on Carbon Dioxide Reforming of Methane over Nickel-Based Catalysts
Zhong-wen Liu,Hyun-Seog Roh,전기원 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
Some factors such as catalyst, temperature, space velocity, feed CO2/CH4 ratio, H2O and/or O2 addition, have been examined for stable operation of carbon dioxide reforming of CH4 (CDR) in a fixed-bed reactor under atmospheric pressure. The Ni/Ce-ZrO2/-Al2O3 catalyst showed high activity and stability under all the conditions employed compared with Ni/MgAl2O4. This seems to be due to strong interactions between NiO and support and relatively abundant mobile oxygen species in the Ce-ZrO2 layer: the former would suppress carbon formation step and the latter would activate the carbon elimination step. The carbon deposition over the catalysts in CDR was drastically reduced with a slight increase of feed CO2/CH4 ratio or the addition of H2O in feed. The oxidation of CH4 and/or steam reforming of CH4 occurred simultaneously with carbon dioxide reforming of CH4, where drastic change of a H2/CO ratio was observed, when the feed was composed of CH4, CO2, H2O and/or O2. Keywords: carbon dioxide reforming, synthesis gas, simultaneous reforming, Ni catalysts, Ce-ZrO2
Carbon Dioxide Reforming of Methane over Ni/La₂O₃/Al₂O₃
Zhong-Wen Liu,Hyun-Seog Roh,전기원 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.3
The precoating effect of La2O3 on the performance of Ni/-Al2O3 catalyst for carbon dioxide reforming of CH4 was investigated. All the catalysts showed a fairly good stability while the addition of La2O3 significantly improved the activity of Ni/-Al2O3. Ni/La2O3/Al2O3 catalysts had an optimum amount of La2O3 loading with a La/Al ratio of 0.05 with the highest activity and stability. The catalysts were characterized by BET, XRD, XPS and TPR techniques. The phase of the precoated La2O3 was changed from highly dispersed La species to well crystallized LaAlO3 with increasing La/Al ratio. The interaction between Ni and the support was changed with the addition of La2O3 and the variation of La/Al ratio. Based on the characterization results, the promotional effect of La2O3 on Ni/-Al2O3 resulted from (1) the chemical environment and electronic state of Ni in Ni-La interface, (2) the stabilization of La2O3 on Al2O3 and (3) the strong basicity of La2O3. It was suggested that the highly dispersed La species is more effective than LaAlO3 for the promotional effect of La2O3.
( Zhong Wen Chen ),( Yin Bing Zhang ),( Xaing Jun Chen ),( Xiao Liu ),( Zhen Wang ),( Xi Kun Zhou ),( Ji Qiu ),( Nan Nan Zhang ),( Xiu Teng ),( Yong Qiu Mao ),( Chang Yong Liu ),( Yu Quan Wei ),( Jion 대한피부과학회 2015 Annals of Dermatology Vol.27 No.3
Background: Psoriasis is an autoimmune disease that is caused by a shift in the Th1/Th2 balance toward Th1- dominant immunity. It has been established as an effective treatment to counteract psoriasis by subcutaneous injection of recombinant interleukin (IL)-4, and IL-4 gene therapy by topical transdermal penetration has shown its antipsoriatic effect in mice. Retinoic acid (RA) and dimethylsulfoxide can increase the efficiency of gene transfection in the topical transdermal delivery system. Objective: We investigated whether RA could improve anti-psoriasis efficiency using IL-4 expression plasmid pORF-mIL-4 (pIL-4) via transdermal delivery system in K14-vascular endothelial growth (K14- VEGF) factor transgenic mice. Methods: After pretreatment with RA, plasmid pIL-4 in 10% dimethylsulfoxide was applied to the ear skin by topical transdermal penetration. Hematoxylin- eosin staining and immunohistochemistry were performed with ear samples to evaluate anti-psoriasis efficiency in mice. Results: The psoriasis pathological features were relieved and psoriasis-associated factors were significantly reduced. Conclusion: Our results reveal that topical application of pIL-4 in dimethylsulfoxide by transdermal delivery with RA pretreatment can improve psoriasis significantly. (Ann Dermatol 27(2) 121∼127, 2015)
( Zhong Wen Chen ),( Yin Bing Zhang ),( Xaing Jun Chen ),( Xiao Liu ),( Zhen Wang ),( Xi Kun Zhou ),( Ji Qiu ),( Nan Nan Zhang ),( Xiu Teng ),( Yong Qiu Mao ),( Chang Yong Liu ),( Yu Quan Wei ),( Jion 대한피부과학회 2015 Annals of Dermatology Vol.27 No.2
Background: Psoriasis is an autoimmune disease that is caused by a shift in the Th1/Th2 balance toward Th1- dominant immunity. It has been established as an effective treatment to counteract psoriasis by subcutaneous injection of recombinant interleukin (IL)-4, and IL-4 gene therapy by topical transdermal penetration has shown its antipsoriatic effect in mice. Retinoic acid (RA) and dimethylsulfoxide can increase the efficiency of gene transfection in the topical transdermal delivery system. Objective: We investigated whether RA could improve anti-psoriasis efficiency using IL-4 expression plasmid pORF-mIL-4 (pIL-4) via transdermal delivery system in K14-vascular endothelial growth (K14- VEGF) factor transgenic mice. Methods: After pretreatment with RA, plasmid pIL-4 in 10% dimethylsulfoxide was applied to the ear skin by topical transdermal penetration. Hematoxylin- eosin staining and immunohistochemistry were performed with ear samples to evaluate anti-psoriasis efficiency in mice. Results: The psoriasis pathological features were relieved and psoriasis-associated factors were significantly reduced. Conclusion: Our results reveal that topical application of pIL-4 in dimethylsulfoxide by transdermal delivery with RA pretreatment can improve psoriasis significantly.(Ann Dermatol 27(2) 121∼127, 2015)
Important Factors on Carbon Dioxide Reforming of Methane over Nickel-Based Catalysts
Liu, Zhong-Wen,Roh, Hyun-Seog,Jun, Ki-Won 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
Some factors such as catalyst, temperature, space velocity, feed CO₂/CH₄ ratio, H₂0 and/or O₂addition, have been examined for stable operation of carbon dioxide reforming of CH₄ (CDR) in a fixed-bed reactor under atmospheric pressure. The Ni/Ce-ZrO₂/θ?- A1₂0₃ catalyst showed high activity and stability under all the conditions employed compared with Ni/MgA1₂0₄. This seems to be due to strong interactions between NiO and support and relatively abundant mobile oxygen species in the Ce-ZrO₂ layer: the former would suppress carbon formation step and the latter would activate the carbon elimination step. The carbon deposition over the catalysts in CDR was drastically reduced with a slight increase of feed COdCH4 ratio or the addition of HrO in feed. The oxidation of CH₄ and/or steam reforming of CH₄ occurred simultaneously with carbon dioxide reforming of CH₄, where drastic change of a H₂/CO ratio was observed, when the feed was composed of CH₄, CO₂, H2O and/or O₂.
Zhong-Liu Zhou,Wen-Qing Yin,Xiao-Peng Zou,Dan-Ying Huang,Cui-Liu Zhou,Lian-Mei Li,Ke-Cheng Chen,Zi-Ying Guo,San-Qing Lin 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.6
The extraction and solvent partition of the leaves ofEucalyptus citriodora, and repeated column chromatography for n-BuOH fraction yielded a new flavonoid glycoside, citrioside C (1),along with three known flavonoid glycosides (2-4). The latter wereidentified with kaempferol-3-O-β-D-glucopyranosyl (12)-α-L-rhamnoside(2), kaempferol-3-O-α-L-rhamnoside (3), and quercetin-3-O-α-Lrhamnoside(4). Their chemical structures were identified on thebasis of spectroscopic data analyses including NMR, MS, UV, andIR. All constitutents were isolated for the first time from the leavesof Eucalyptus citriodora. The potential antivirus activity of all theisolated compounds was evaluated. Compound 4 showed potentantiviral activity against respiratory syncytial virus with 50%inhibition concentration (IC50) value of 1.9 μg/mL and selectiveindex value of 9.8.