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Ham, Hyungwon,Kim, Jihyeon,Lim, Jong Hun,Sung, Woo Chang,Lee, Dong Hyun,Bae, Jong Wook Elsevier 2018 CATALYSIS TODAY - Vol.303 No.-
<P><B>Abstract</B></P> <P>Selective ethanol synthesis from syngas through cascade multi-step reactions via methyl acetate (MA) intermediate route was investigated using a highly crystalline ferrierite (FER) zeolite and hybridized bifunctional Cu-ZnO-Al<SUB>2</SUB>O<SUB>3</SUB>/FER (CZA/FER). The extent of crystallinity of the FER zeolites played crucial roles for catalytic activities of syngas conversion to dimethyl ether (DME), DME carbonylation to MA and MA hydrogenation to ethanol. With an increase of crystallinity of FER, DME productivity by CO<SUB>2</SUB> (or CO) hydrogenation was largely enhanced due to a fast dehydration rate of methanol to DME on the CZA/FER having a large surface area of metallic copper nanoparticles. The bifunctional CZA/FER was utilized to convert MA to ethanol up to the similar equilibrium yield of ∼42 mol%. In addition, highly crystalline of FER@FER, which was synthesized by using a FER seed, showed a higher DME conversion to MA and stability due to the abundant presence of Bronsted acid sites with less defect sites. To verify the possible integration of two series cascade reactions such as direct syngas conversion to DME and its consecutive carbonylation to MA, the segregated double-layer formation in one bubbling fluidized-bed reactor was simulated. Two catalytic reaction regions with a light and dense-phase at similar reaction conditions were completely segregated at optimal linear velocity ranges (minimum fluidizing velocity, U<SUB>mf</SUB>) by using two different catalyst particle sizes having an average size of 112.5 and 82.5μm in a bottom and upper reaction zone, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Selective ethanol synthesis from syngas by cascade reactions was investigated. </LI> <LI> Highly crystalline ferrierite played crucial roles for syngas and DME conversion. </LI> <LI> Two reactions can be integrated using a fluidized-bed reactor with segregated double-bed catalysts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ham, Kyung-Yuen,Jeon, Young-Cheol,Kang, Jin-Woo,Kim, Nam-Kyun,Lee, Won-Jae,Lee, Yang,Ryu, Sung-Ju,Yang, Hae-Hun Korean Mathematical Society 2008 대한수학회지 Vol.45 No.3
A ring R is called IFP, due to Bell, if ab=0 implies aRb=0 for $a,b{\in}R$. Huh et al. showed that the IFP condition need not be preserved by polynomial ring extensions. But it is shown that ${\sum}^n_{i=0}$ $E_{ai}E$ is a nonzero nilpotent ideal of E whenever R is an IFP ring and $0{\neq}f{\in}F$ is nilpotent, where E is a polynomial ring over R, F is a polynomial ring over E, and $a_i^{'s}$ are the coefficients of f. we shall use the term near IFP to denote such a ring as having place near at the IFPness. In the present note the structures of IFP rings and near-IFP rings are observed, extending the classes of them. IFP rings are NI (i.e., nilpotent elements form an ideal). It is shown that the near-IFPness and the NIness are distinct each other, and the relations among them and related conditions are examined.
Ham, Jun-Sang,Lee, Seung-Gyu,Kim, Min-Kyung,Oh, Mi-Hwa,Jeong, Seok-Geun,Kim, Dong-Hun,Lee, Se-Hyung,Chae, Jong-Pyo,Lee, Ji-Yoon,Kang, Dae-Kyung Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.9
The aim of this study was to screen lactic acid bacteria for the fermentation of garlic and to assess the increase in inhibitory activity of garlic fermented against antibiotic-resistant pathogens for use as an animal feed supplement. We screened 45 strains of lactobacillus for the fermentation of garlic. Of these strains, 23 showed similar growth rates with or without allicin. Cultures of the 23 strains were mixed with an equivalent amount of garlic juice and incubated overnight at $37^{\circ}C$. The three strains with the lowest pH values were Lactobacillus paracasei KCTC 3169, L5 strain, and L. reuteri SW. Garlic juice fermented by the L5 strain more strongly inhibited antibiotic-resistant pathogenic bacteria than L. paracasei KCTC 3169, L. reuteri SW, or garlic juice itself. By examining carbohydrate utilization, morphologic properties and 16S rRNA gene sequences, we identified the L5 strain as Pediococcus pentosaceus and deposited it in the name of P. pentosaceus KACC 91419 into the Korea Agricultural Culture Collection. To identify the antimicrobial compound from the garlic filtrate fermented by P. pentosaceus KACC 91419, we fractionated P. pentosaceus KACC 91419 culture on a C18 column and checked the antimicrobial activity of fractions A6 to A10. Only fraction A9 showed inhibitory activity on Staphylococcus aureus. Comparing the mass spectra of the fractions with and without antimicrobial activity, we observed a single dominant product ion (m/z 157.99) from the fraction showing antimicrobial activity. Its molecular mass (157.99) was 2 atomic mass units less than that of allicin (162.02). This suggests that allicin might be converted to its derivative, which has antimicrobial activity, during fermentation by P. pentosaceus KACC 91419.
Ham, Won-Hun,Yang, Jae-Gwon,Lim, Tae-Gyun,Jung, Yun-Ho,Chung, Yun-Sung The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.2
The synthesis of 3a, 3b, 7a fro Benzpthiazepinone and 1,4-dihyropyridine derivatives is described. Benzothiazepinone nad 1,4-dihydropyridine derivatives were prepared according to literature procedure. The key reactions involve esterification and amidation of benzothize-pinone nad 1,4-dihydropyridine derivatives.
Ham, Jun-Sang,Lee, Seung-Gyu,Jeong, Seok-Geun,Oh, Mi-Hwa,Kim, Dong-Hun,Lee, Tae-Heon,Lee, Bo-Young,Yoon, Sook-Hee,Kim, Hee-Bal Korean Society for Molecular and Cellular Biology 2010 Molecules and cells Vol.30 No.1
Staphylococcus aureus is an important human pathogen responsible for life-threatening septicemia, endocarditis, and toxic shock syndrome. Although positive (MRSA; ATCC 33591) and negative (MSSA; ATCC 25923) control strains have been used for various pathogenesis or assay studies, little is known about the genomic structure of the strains, and there has been little genome-wide expression analysis. Phylogenetic analyses revealed that ATCC 33591 and ATCC 25923 are the most genetically diverse strains of the 15 S. aureus genomes studied. Microarray analysis showed that the most significantly upregulated group of MRSA genes was the transport group, which includes ATP-binding cassette (ABC) transporters, the two-component system, and the phosphotransferase system. Analysis of the KEGG pathway showed that ABC transporters and the two-component system were the most significantly altered in MRSA. Transcriptional profiling showed a clear difference in gene expression between MRSA and MSSA due to the great genetic distance between the two control strains. Therefore, we suggest that use of the two control strains in comparative genomics or transcriptomics studies would facilitate the identification of major genes for drug resistance in S. aureus.