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Quantum Chemical Consideration of CO Adsorption over Cation Exchanged Faujasite
Park, Doo Seon,Kim, Jong Taik,Kim, Myung Chul,Hong, Sang Phyo 한국화학공학회 1990 NICE Vol.8 No.4
CNDO/2 calculation for atomic charges Wiberg bond orders and adsorption energies of CO molecules on the cluster model whose Si/Al ratio varied were carried out. The data for the normal cluster and dealuminated cluster were compared. Decationization energies of the canons increased with the charge densities of canon and number of aluminum involved. Adsorption process of CO on the monovalent canons such as , Li^-, Na^+ and divalent canons, Be^(2+), Ca^(2+), and Mg^(2-) was supposed to be occurring by the donation of non-bonded electrons from CO. The decationization energies of canons obviously decreased by the dealumination process. Adsorption energies of CO on the canons generally decreased ache dealumination took place except the case of H^+ and Na^+.
( Doo Bo Shim ),( Eun Sil Park ),( Gyu Jin Sim ),( Ji Young Lee ),( Ju Hwan Kang ),( Hyun Joo Yoo ),( Yeon Jin Choi ),( Young Mee Lee ),( Sang Yeol Lee ),( Min Gab Kim ),( Da Won Kang ),( Eun Jung Jun 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.4
Eukaryotic translation initiation factor 5A (eIF5A) is the only hypusine-containing protein, which is formed by deoxyhypusine synthase (DHS) and deoxyhypusine hydroxylase (DOHH). DOHH is a novel metalloenzyme with HEAT [named for human huntingtin (H), elongation factor 3 (E), a subunit of protein phosphatase 2A (A), and the target of rapamycin (T)]-repeat motifs. Inspite of much progress in determining the roles of iron-containing DOHH holoenzyme as an eIF5A hydroxylase, little is known about iron-free apoenzyme of DOHH under certain stress conditions. For this purpose, we compared cell growth in two yeast strains subjected to oxidative damage. Thus, the existence of more viable cells in the Saccharomyces cerevisiae BY4743 (parental yeast) strain than in the DOHH-null strain after H2O2 treatment indicates the importance of DOHH in protecting yeast cells against oxidative stress. To identify endogenous target proteins influenced by DOHH under oxidative damage, proteomic analysis was applied to the two yeast strains. Of these proteins, the oxidized form of peroxiredoxin I (PrxI) was concomitantly up-regulated in both strains under H2O2 treatment. Two-dimensional electrophoresis (DE) followed by immunoblot analysis shows that the recovery of the oxidized PrxI to the reduced enzyme under H2O2 treatment was found to be much slower in the DOHH-null strain than in the parental strain. Based on the results, we discovered a possible interaction between DOHH and PrxI by immunoprecipitation/immunoblotting in yeast under oxidative stress. Taken together, these results suggest that DOHH might be a candidate protein for protection of yeast cells against oxidative stress in conjunction with PrxI.
Nanocrack-regulated self-humidifying membranes
Park, Chi Hoon,Lee, So Young,Hwang, Doo Sung,Shin, Dong Won,Cho, Doo Hee,Lee, Kang Hyuck,Kim, Tae-Woo,Kim, Tae-Wuk,Lee, Mokwon,Kim, Deok-Soo,Doherty, Cara M.,Thornton, Aaron W.,Hill, Anita J.,Guiver, Nature Publishing Group, a division of Macmillan P 2016 Nature Vol.532 No.7600
<P>The regulation of water content in polymeric membranes is important in a number of applications, such as reverse electrodialysis and proton-exchange fuel-cell membranes. External thermal and water management systems add both mass and size to systems, and so intrinsic mechanisms of retaining water and maintaining ionic transport(1-3) in such membranes are particularly important for applications where small system size is important. For example, in proton-exchange membrane fuel cells, where water retention in the membrane is crucial for efficient transport of hydrated ions(1,4-7), by operating the cells at higher temperatures without external humidification, the membrane is self-humidified with water generated by electrochemical reactions(5,8). Here we report an alternative solution that does not rely on external regulation of water supply or high temperatures. Water content in hydrocarbon polymer membranes is regulated through nanometre-scale cracks ('nanocracks') in a hydrophobic surface coating. These cracks work as nanoscale valves to retard water desorption and to maintain ion conductivity in the membrane on dehumidification. Hydrocarbon fuel-cell membranes with surface nanocrack coatings operated at intermediate temperatures show improved electrochemical performance, and coated reverse-electrodialysis membranes show enhanced ionic selectivity with low bulk resistance.</P>
Park, Hyo Jin,Kim, Hye Sung,Chung, Doo Hyun The Korean Association of Immunobiologists 2010 Immune Network Vol.10 No.1
Background: Hypersensitivity pneumonitis (HP) is an interstitial lung disease that develops following repeated exposure to inhaled particulate antigens. The family of $Fc{\gamma}$ receptors ($Fc{\gamma}Rs$) has emerged as central regulators for modulating both pro-and anti-inflammatory responses. However, the role of $Fc{\gamma}Rs$ in the development of HP has not been investigated yet. Methods: To explore the functional roles of $Fc{\gamma}Rs$ in HP, $Fc{\gamma}R^{-/-}$ and B6 mice were challenged with Saccharopolyspora rectivirgula (SR) antigen intranasally, and compared these mice in terms of the histological change, infiltrated immune cells in BALF and in vitro immune responses. Results: $Fc{\gamma}R^{-/-}$ mice exhibited attenuation of HP in terms of histological alterations, and reduced numbers of neutrophils and macrophages in and the increased CD4 : CD8 ratio of bronchoalveolar lavage fluid. The lungs of $Fc{\gamma}R^{-/-}$ mice showed high production of Th2 cytokine such as IL-4 and slightly low production of Th1 cytokine, INF-${\gamma}$ compared to those of B6 mice. However, SR-specific adaptive immune responses of $Fc{\gamma}R^{-/-}$ mice were similar to those of B6 mice. Conclusion: These results demonstrate that activating $Fc{\gamma}$ receptors play an important role in activating neutrophils and macrophages in pulmonary inflammation and inducing Th1 differentiation by regulating cytokine expression in SR-induced HP.
Lutibacter crassostreae sp. nov., isolated from oyster.
Park, Sooyeon,Park, Ji-Min,Won, Sung-Min,Park, Doo-Sang,Yoon, Jung-Hoon Society for General Microbiology 2015 International journal of systematic and evolutiona Vol.65 No.8
<P>A Gram-stain-negative, aerobic, non-spore-forming, non-flagellated, non-gliding and ovoid or rod-shaped bacterial strain, designated TYO-8T, was isolated from an oyster collected from the South Sea in South Korea. Strain TYO-8T grew optimally at 25?C, at pH?7.0-8.0 and in the presence of 2.0-3.0?% (w/v) NaCl. A neighbour-joining phylogenetic tree, based on 16S rRNA gene sequences, revealed that strain TYO-8T fell within the clade comprising the type strains of species of the genus Lutibacter, clustering coherently with the type strain of Lutibacter litoralis with a sequence similarity of 99.3?%. Strain TYO-8T exhibited 16S rRNA gene sequence similarity values of 95.3-97.5?% to the type strains of other species of the genus Lutibacter and of less than 92.9?% to the type strains of other species with validly published names. Strain TYO-8T contained MK-6 as the predominant menaquinone and iso-C15?:?0, iso-C15?:?0 3-OH and iso-C15?:?1 G as the major fatty acids. The major polar lipids of strain TYO-8T were phosphatidylethanolamine and two unidentified lipids. The DNA G+C content of strain TYO-8T was 33.8?mol% and its DNA-DNA relatedness values with the type strains of L. litoralis, Lutibacter aestuarii and Lutibacter flavus were 13-27?%. The differential phenotypic properties, together with the phylogenetic and genetic distinctiveness, revealed that strain TYO-8T is distinct from other species of the genus Lutibacter. On the basis of the data presented, strain TYO-8T is considered to represent a novel species of the genus Lutibacter, for which the name Lutibacter crassostreae sp. nov. is proposed. The type strain is TYO-8T (?=?KCTC 42461T?=?NBRC 110923T).</P>