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Choi, Mun Hwan,Xu, Ju,Rho, Jong Kook,Shim, Ji Hoon,Yoon, Sung Chul Wiley Subscription Services, Inc., A Wiley Company 2009 Biotechnology and bioengineering Vol.102 No.4
<P>Medium-chain-length-polyhydroxyalkanoic acids (MCL-PHAs) formed in Pseudomonas spp. have a rather broad distribution of monomer-units whose precursors are supplied via β-oxidation degradation of MCL fatty acids fed as the carbon source and/or via PhaG enzyme catalyzing the acyl-group transfer from 3-hydroxyacyl-ACPs derived from acetyl-CoA to coenzyme A. It was found that salicylic acid (SA), in a concentration dependent manner, suppressed the accumulation of PHA in Pseudomonas fluorescens BM07 from fructose as well as shifted the distribution of monomer-units derived from a MCL fatty acid co-added as carbon source (e.g., 11-phenoxyundecanoic acid (11-POU)) to longer monomer-units. Both SA and acrylic acid were found to induce high accumulations of 3-ketohexanoic acid in BM07 wild-type cells grown with n-hexanoic acid as well as to inhibit the formation of acetyl-CoA from acetoacetyl-CoA by BM07 cell extract, suggesting that 3-ketoacyl-CoA thiolase is their common β-oxidation target. The structural motif of acrylic acid present in the molecular structure of SA may self-explain the similar actions of the two inhibitors. A comparison of monomer modulation between BM07 wild-type and ΔphaG mutant cells grown on the mixtures of fructose and 11-POU revealed that both PhaG and β-oxidation inhibitor may play a critical role in the synthesis of PHA with longer side-chain ω-functional substitutions. Biotechnol. Bioeng. 2009;102: 1209–1221. © 2008 Wiley Periodicals, Inc.</P>
Efficient radiolabeling of rutin with 125I and biodistribution study of radiolabeled rutin
Choi, Mi Hee,Rho, Jong Kook,Kang, Jung Ae,Shim, Ha Eun,Nam, You Ree,Yoon, Seonhye,Kim, Hye Rim,Choi, Dae Seong,Park, Sang Hyun,Jang, Beom-Su,Jeon, Jongho Springer-Verlag 2016 JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY Vol.308 No.2
Choi, Sung Min,Ahn, Junsung,Son, Ji-Won,Lee, Jong-Ho,Kim, Byung-Kook,Yoon, Kyung Joong,Ji, Ho-Il American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.46
<P>Degradation of oxygen electrode in reversible solid oxide cells operating in both electrolysis and fuel-cell modes is a critical issue that should be tackled. However, origins and mechanisms thereof have been diversely suggested mainly due to the difficulty in precise analysis of microstructural/compositional changes of porous electrode, which is a typical form in solid oxide cells. In this study, we investigate the degradation phenomena of oxygen electrode under electrolysis and fuel-cell long-term operations for 540 h, respectively, using a geometrically well-defined, nanoscale La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3−δ</SUB> (LSCF) dense film with a thickness of ∼70 nm. Based on assessments of electrochemical properties and analyses of microstructural and compositional changes after long-term operations, we suggest consolidated degradation mechanisms of oxygen electrode, including the phenomena of kinetic demixing/decomposition of LSCF, which is not readily observable in the typical porous-structured electrode.</P> [FIG OMISSION]</BR>
Choi, Sung Min,Lee, Jong-Heun,Hong, Jongsup,Yoon, Kyung Joong,Son, Ji-Won,Kim, Byung-Kook,Lee, Hae-Weon,Lee, Jong-Ho Elsevier 2016 Journal of Power Sources Vol.332 No.-
<P><B>Abstract</B></P> <P>The chemical-diffusion and surface-exchange coefficients of a proton-conducting oxide, i.e., Ba(Zr<SUB>0.84</SUB>Y<SUB>0.15</SUB>Cu<SUB>0.01</SUB>)O<SUB>3−δ</SUB> upon a sudden change of water-vapor pressure at a fixed oxygen partial pressure are investigated via a conductivity relaxation technique. Conductivity relaxation during the hydration/dehydration process follows typical two-fold non-monotonic behavior that can be explained by decoupled chemical diffusion of H and O. However, the temperature dependence of the measured chemical-diffusion and surface-exchange coefficients is significantly different depending on the direction of the temperature change. In this study, we attempt to identify the origin of these unusual behaviors during the conductivity relaxation experiment via thorough microstructural and compositional analyses on sample surface.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydration kinetics of BZYCu was determined by conductivity relaxation method. </LI> <LI> Time-dependent degradation of the kinetics occurs during the hydration process. </LI> <LI> Elapsed time variable should be considered during conductivity relaxation experiment. </LI> </UL> </P>