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Park, Chan-Beum,Lee, Sun-Bok The Korean Society for Biotechnology and Bioengine 1998 Biotechnology and Bioprocess Engineering Vol.3 No.2
Utilization of yeast extract and formation of byproduct metabolite were investigated for hyperthermophilic archaeon Sulfolobus solfataricus (DSH 1617). In both batch and fed-batch cultivations of S. solfataricus, maximal cell density, {{{{ { NH}`_{4 } ^{ +} }}} ion production and pH change were highly dependent on the ratio of yeast extract to glucose in the medium. Variation of {{{{ { NH}`_{4 } ^{ +} }}}} ion level was identified as a major cause of pH change during cultivation, and acidification of culture broth was attributed to consumption of {{{{ { NH}`_{4 } ^{ +} }}}} ions rather than formation of acid byproducts. It was also observed that increase of {{{{ { NH}`_{4 } ^{ +} }}}} ion concentrations in the medium resulted in greater degree of growth inhibition.
Cultivation of the Hyperthermophilic Archaeon Sulfolobus solfataricus in Low-Salt Media
Park, Chan-Beum,Lee, Sun-Bok The Korean Society for Biotechnology and Bioengine 1999 Biotechnology and Bioprocess Engineering Vol.4 No.1
Two low-salt complex media, bactopeptone and desalted yeast extract, were used for high density cultivation of the hyperthermophilic archaeon Sulfolobus solfataricus (DSM 1617). Bactopeptone, which has low mineral ion content among various complex media, was good for cell growth in batch cultures; the maximal cell density in bactopeptone was comparable to that in yeast extract. However, cell growth was rather poor when bactopeptone was added by the fed-batch procedure. Since several vitamins are deficient in abctopeptone, the effect of vitamins on cell growth was examined. Among the vitamins tested, pyridoxine was found to improve the growth rate of S. solfataricus. To reduce the growth inhibition caused by mineral ions, yeast extract was dialyzed against distilled water and then fed-batch cultures were carried out using a fed medium containing desalted yeast extract. Although the concentrations of mineral ions in yeast extract were significantly lowered by the dialysis whether low molecular weight solutes in yest extract are crucial for cell growth, we investigated the effect of trehalose, a most abundant compatible solute in yeast extract, on the growth pattern. Cell densities were increased and the length of the lag phase was markedly shortened by the presence of trehalose, indicating that trehalose plays an important role in the growth of S. solfataricus.
Park, Beum Jin,Jang, Sanha,Lee, Jin Hee,Chun, Dong Hyun,Park, Ji Chan,Park, Ho Seok The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.24
<P>A hierarchical architecture designated as Fe5C2@Ns-rGO/CNT, consisting of carbon nanotubes, steam activated N-doped reduced graphene oxides, and activated iron carbide nanoparticles, was prepared <I>via</I> microwave irradiation and subsequent CO activation. The Fe5C2@Ns-rGO/CNT was successfully applied to a rapid CO hydrogenation reaction showing extremely high activity of 4.4 × 10<SUP>−3</SUP> molCO gFe<SUP>−1</SUP> s<SUP>−1</SUP> at a fast gas velocity of 210 NL gcat<SUP>−1</SUP> h<SUP>−1</SUP>.</P>
Ryu, Jungki,Lee, Sahng Ha,Nam, Dong Heon,Park, Chan Beum WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.16
<P>A novel application of quantum‐dot QD sensitized TiO<SUB>2</SUB> nanotubes for artificial photosynthesis is presented by Chan Beum Park and co‐workers on p. 1883. The system is conceptually very close to natural photosynthesis; photo‐excited electrons are rapidly injected to nearby reaction centers upon light irradiation and generate reducing power, driving redox reactions for synthesis of organic compounds. This study demonstrates that more efficient artificial photosynthetic systems can be developed through rational design and engineering of photosystems. </P>
박범조(Beum Jo Park),고석찬(Suk Chan Ko) 한국지역학회 1998 지역연구 Vol.14 No.2
This paper examines the determinants of imbalanced regional development in Korea during the period of 1985-1995. The review of previous empirical researches indicates that various analytical techniques have been used to analyze the determinants of disparities in regional development, but few has applied the regression technique which reduces a bias due to heterogeneity across region. The results of the study show that Kmenta model with per capita GRDP as dependent variable can reduce the heterogeneity bias in regional development and can minimize the statistical errors in estimation and interpretation of the coefficients of the explanatory variables. According to the result of Kmenta model, urban infrastructure such as roads, information and communication facilities are major causes of regional disparity over the period of 1985-1995. The results of the study also indicate that local government should devote their policy efforts to identify and utilize the unique soci-economic characteristics of each locality in the process of regional development.
Synthesis of Diphenylalanine/Polyaniline Core/Shell Conducting Nanowires by Peptide Self-Assembly
Ryu, Jungki,Park, Chan Beum WILEY-VCH Verlag 2009 Angewandte Chemie Vol.48 No.26
<P>Breaking the mold: Self-assembled peptide nanowires were used as a template for the synthesis of hollow polyaniline (PANI) nanotubes (see scanning electron microscopy images). The thickness and the morphology of the PANI nanostructures could be controlled readily either by varying the reaction time or by applying multiple PANI coatings. <img src='wiley_img/14337851-2009-48-26-ANIE200900668-content.gif' alt='wiley_img/14337851-2009-48-26-ANIE200900668-content'> </P> <B>Graphic Abstract</B> <P>Breaking the mold: Self-assembled peptide nanowires were used as a template for the synthesis of hollow polyaniline (PANI) nanotubes (see scanning electron microscopy images). The thickness and the morphology of the PANI nanostructures could be controlled readily either by varying the reaction time or by applying multiple PANI coatings. <img src='wiley_img/14337851-2009-48-26-ANIE200900668-content.gif' alt='wiley_img/14337851-2009-48-26-ANIE200900668-content'> </P>