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Doo Hyun Park 5 Articles
Symbiotic Relationship between Microbacterium sp. SK0812 and Candida tropicalis SK090404
Seung Won Kang , Bo Young Jeon , Tae Sik Hwang , Doo Hyun Park
J. Microbiol. 2009;47(6):721-727.   Published online February 4, 2010
DOI: https://doi.org/10.1007/s12275-009-0146-2
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AbstractAbstract PDF
A bacterium growing inside yeast cytoplasm was observed by light microscope without staining. The bacterium was separately stained from yeast cell by a fluorescent dye, 4′,6-diamidino-2-phenylindole (DAPI). The bacterium actively moved inside yeast cytoplasm and propagated in company with the yeast growth. The bacterium was separated from the yeast cytoplasm by selective disruption of yeast cells and the yeast without the intracellular bacterium (YWOB) was obtained by selective inactivation of bacterial cells. The yeast and the intracellular bacterium were identified as Candida tropicalis and Microbacterium sp., respectively. The length of Microbacterium sp. and C. tropicalis measured with SEM image was smaller than 0.5 μm and was larger than 5 μm, respectively. The yeast with the intracellular bacterium (YWIB) grew in a starch-based medium but the YWOB was not C. tropicalis has neither extracellular nor intracellular saccharification enzyme. Glucose was produced from starch by the extracellular crude enzyme (culture fluid) of Microbacterium sp. YWIB produced significantly more ethanol from glucose than YWOB but did not from starch. Conclusively, C. tropicalis is thought to catabolize starch dependent upon Microbacterium sp. growing in its cytoplasm and furnish stable habitat for the Microbacterium sp.

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    Omid Askari-Khorasgani, Harlene Hatterman-Valenti, Francisco Borja Flores, Mohammad Pessarakli
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Characterization of Exopolysaccharide (EPS) Produced by Weissella hellenica SKkimchi3 Isolated from Kimchi
Min Ju Kim , Ha Na Seo , Tae Sik Hwang , Sung Hun Lee , Doo Hyun Park
J. Microbiol. 2008;46(5):535-541.   Published online October 31, 2008
DOI: https://doi.org/10.1007/s12275-008-0134-y
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AbstractAbstract PDF
Weissella hellenica SKkimchi3 produces the higher exopolysaccharide (EPS) on sucrose than lactose, glucose, and fructose at pH 5 and 20°C. Sucrose was exclusively used to cultivate SKkimchi3 in all experiments base on the EPS production tests. The molecular mass of EPS, as determined by gel permeation chromatography, was 203,000. 1H and 13C NMR analysis indicated that the identity of EPS may be a glucan. When EPS, starch, and cellulose was treated with α-amylase, glucoamylase, glucosidase, and cellulase, glucose was produced from starch and cellulose but was not produced from EPS. Based on HPLC analysis, elemental analysis, 1H and 13C NMR analysis, and enzymatic hydrolysis tests, EPS was estimated to be a glucan. EPS suspension was not precipitated even by centrifugation at 10,000×g for 60 min, and EPS made the fermented milk and bacterial culture viscous.

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Electrochemical Reduction of Xylose to Xylitol by Whole Cells or Crude Enzyme of Candida peltata
Sun Mi Park , Byung In Sang , Dae Won Park , Doo Hyun Park
J. Microbiol. 2005;43(5):451-455.
DOI: https://doi.org/2276 [pii]
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AbstractAbstract PDF
In this study, whole cells and a crude enzyme of Candida peltata were applied to an electrochemical bioreactor, in order to induce an increment of the reduction of xylose to xylitol. Neutral red was utilized as an electron mediator in the whole cell reactor, and a graphite-Mn(IV) electrode was used as a catalyst in the enzyme reactor in order to induce the electrochemical reduction of NAD+ to NADH. The efficiency with which xylose was converted to xylitol in the electrochemical bioreactor was five times higher than that in the conventional bioreactor, when whole cells were employed as a biocatalyst. Meanwhile, the xylose to xylitol reduction efficiency in the enzyme reactor using the graphite-Mn (IV) electrode and NAD+ was twice as high as that observed in the conventional bioreactor which utilized NADH as a reducing power. In order to use the graphite-Mn(IV) electrode as a catalyst for the reduction of NAD+ to NADH, a bioelectrocatalyst was engineered, namely, oxidoreductase (e.g. xylose reductase). NAD+ can function in this biotransformation procedure without any electron mediator or a second oxidoreductase for NAD+/NADH recycling
Growth and Physiological Properties of Wild Type and Mutants of Halomonas subglaciescola DH-1 in Saline Environment
Hye Jeong Ryu , Yoo Jung Jeong , Doo Hyun Park
J. Microbiol. 2004;42(3):174-180.
DOI: https://doi.org/2093 [pii]
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AbstractAbstract PDF
A halophilic bacterium was isolated from fermented seafood. The 16S rDNA sequence identity between the isolate and Halomonas subglaciescola AJ306801 was above 95%. The isolate that did not grow in the condition without NaCl or in the condition with other sodium (Na^+) or chloride ions (Cl^-) instead of NaCl was named H. subglaciescola DH-1. Two mutants capable of growing without NaCl were obtained by random mutagenesis, of which their total soluble protein profiles were compared with those of the wild type by two-dimensional electrophoresis. The external compatible solutes (betaine and choline) and cell extract of the wild type did not function as osmoprotectants, and these parameters within the mutants did not enhance their growth in the saline environment. In the proton translocation test, rapid acidification of the reactant was not detected for the wild type, but it was detected for the mutant in the condition without NaCl. From these results, we derived the hypothesis that NaCl may be absolutely required for the energy metabolism of H. subglaciescola DH-1 but not for its osmoregulation, and the mutants may have another modified proton translocation system that is independent of NaCl, except for those mutants with an NaCl-dependent system.
Growth Properties of the Iron-reducing Bacteria, Shewanella putrefaciens IR-1 and MR-1 Coupling to Reduction of Fe(III) to Fe(II)
Doo Hyun Park , Byung Hong Kim
J. Microbiol. 2001;39(4):273-278.
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AbstractAbstract PDF
Shewanella putrefaciens IR-1 and MR-1 were cultivated by using various combinations of electron donor-acceptor, lactate-Fe(III), lactate-nitrate, pyruvate-Fe(III), pyruvate-nitrate, H_2 -acetate-Fe(III) and H_2 -acetate-nitrate. Both strains grew fermentatively on pyruvate but not on lactate without an electron acceptor. In culture with Fe(III), both strains grew on pyruvate and lactate but not on H_2 -acetate-CO_2 . In cultivation with nitrate, both strains grew on pyruvate, lactate and on H_2 -acetate-CO_2 . The growth yields of IR-1 on pyruvate, pyruvate-Fe(III) and lactate-Fe(III) were about 3.4, 3.5, and 3.6 (g cell/M substrate), respectively, but the yields on lactate-nitrate, pyruvate-nitrate and H_2 -acetate-CO_2 ?trate were about 6.8, 5.9, and 9.4 (g cell/M substrate), respectively. From the growth properties of both strains on media with Fe(III) as an electron acceptor, the bacterial growth was confirmed not to be increased by addition of Fe(III) as an electron acceptor to the growth medium, which indicates a possibility that the dissimilatory reduction of Fe(III) to Fe(II) may not be coupled to free energy production.

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