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Kwon, Kae-Kyoung,Lee, Hyun-Sang,Jung, Sung-Young,Yim, Joung-Han,Lee, Jung-Hyun,Lee, Hong-Kum The Microbiological Society of Korea 2002 The journal of microbiology Vol.40 No.4
Bacterial strains were isolated from biofilms formed on glass slides submerged in seawater in Dae-Ho Dike. Eight strains showing fast attaching ability were selected and identified. Their exopolysaccharide (EPS)-producing ability and EPS properties were characterized. Based on Microlog System, 4 among the 8 strains were identified as Micrococcus luteus and the rest were Bacillus thuringiensis, Bacillus megaterium,, Staphylococcus saprophyticus and Agrobacterium vitis. A, vitis was reidentified as Sulfitobacter pontiacus based on 16S rDNA sequence data. The amount of water-soluble EPS produced by the 8 strains ranged from 0.114 to 1.329 g$.$l$\^$-1/ and the productivity was negatively correlated with the cell biomass. The molecular weight of the produced EPS ranged from 0.38 to 25.19$\times$10$\^$4/ Da. Glucose and galactose were ubiquitous sugar components. Mannose, ribose, and xylose were also major sugar components. The molecular weight and composition of the EPS showed strain-specific variation.
Kwon, Kae Kyoung,Lee, Hee-Soon,Jung, Hong-Bae,Kang, Ji-Hyun,Kim, Sang-Jin Society for General Microbiology 2006 International journal of systematic and evolutiona Vol.56 No.4
<P>A marine bacterium, GW1-1T, capable of degrading benzo[a]pyrene (BaP), was isolated from estuarine sediments of the South Sea (the Korea Strait), Korea, after an enrichment culture maintained for 2 years in a medium supplemented with a mixture of BaP and pyrene. The strain formed yellowish-brown colonies on marine agar 2216. Cells were strictly aerobic, non-motile, Gram-negative rods and produced non-diffusible carotenoid pigments. Optimal growth occurred in the presence of 1 % (w/v) NaCl and at pH 7 and 33-36 degrees C. No growth occurred without supplementation with either CaCl2 or MgCl2, even in the presence of NaCl. Phylogenetic analysis based on the nearly complete sequence of the 16S rRNA gene revealed that the isolate formed a phyletic lineage with the genera Gelidibacter (93.9-94.7 % gene sequence similarity), Subsaximicrobium (93.3 %) and Subsaxibacter (93.9 %). The isolate also showed high sequence similarities to Gaetbulibacter saemankumensis (94.5 %), Algibacter lectus (94.2 %), members of the genus Bizionia (93.6-94.3 %) and Formosa algae (93.2 %), even though it belonged to a different phyletic line. The major respiratory quinones of the isolate were menaquinones MK-5 and MK-6. The DNA G+C content was 51.4 mol%. Dominant fatty acids were i-15 : 0, a-15 : 0, i-15 : 1omega10c and 16 : 1. On the basis of this polyphasic taxonomic evidence, strain GW1-1T is classified as a member of a novel genus and species in the family Flavobacteriaceae, for which the name Yeosuana aromativorans gen. nov., sp. nov. is proposed. The type strain of the type species is GW1-1T (=KCCM 42019T = JCM 12862T).</P>
Kwon, Kae-Kyoung,Je, Jong-Geel Korea Institute of Ocean ScienceTechnology 2002 Ocean and Polar Research Vol.24 No.1
To evaluate the effect of reed population on the distribution and activities of microorganisms, vertical distribution of heterotrophic bacteria, degradation rate of cellulose, extracellular aminopeptidase activity (APA) and metabolic diversity based on GN2 Microlog plate were measured at two salt marsh stations in Hogok-ri, Namyang Bay, west coast of Korea. The number of heterotrophic bacteria at station 1 (reed population inhabited area) showed 2 to 6 times higher than that of station 2 (exposed area) with exception in the surface layer. Cellulose degradation rates in station 1 showed more than 50%. month-I and higher than that of station 2 (10.2 to 38.4%. $month^{-1}$). Yet the APA at two stations did not show difference except surface layer and suggested that APA might not be a significant factor in degrading marsh plant debris. Lipid class compounds, cell wall polymers and L-alanine were widely used by microorganisms. The number and activities of bacterial populations especially concerned in plant debris degradation seemed to be stimulated by the reed communities.
Kwon, Kae Kyoung,Lee, Hee-Soon,Yang, Sung Hyun,Kim, Sang-Jin Microbiology Society 2005 International journal of systematic and evolutiona Vol.55 No.5
<P>A marine bacterium, designated strain GW14-5<SUP>T</SUP>, capable of degrading high-molecular-mass polycyclic aromatic hydrocarbons was isolated from the sediments of Gwangyang Bay, Republic of Korea, after enrichment culture for 2 years with a mixture of benzo[a]pyrene and pyrene. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate forms a phyletic lineage that is distinct from the seven known orders within the ‘<I>Alphaproteobacteria</I>’. 16S rRNA gene sequence similarity of strain GW14-5<SUP>T</SUP> to all recognized bacterial species was not greater than 92 %. The dominant fatty acids of the isolate were i-17 : 1 (46·2 %), i-15 : 0 (15·1 %) and i-17 : 0 (12·6 %). The major respiratory quinone was MK-5, and the DNA G+C content was 39·3 mol%. Cells of strain GW14-5<SUP>T</SUP> were Gram-negative, motile, catalase-positive, oxidase-positive and weakly halophilic. Glucose, <I>N</I>-acetylglucosamine and maltose were utilized as sole carbon sources. The strain was positive for <I>β</I>-glucosidase activity. Optimal growth of strain GW14-5<SUP>T</SUP> was at pH 7·0 and 37-40 °C and required the presence of 2 % (w/v) NaCl. On the basis of this evidence, strain GW14-5<SUP>T</SUP> represents a novel genus and species in the ‘<I>Alphaproteobacteria</I>’ for which the name <I>Kordiimonas gwangyangensis</I> gen. nov., sp. nov. is proposed. The novel order <I>Kordiimonadales</I> is proposed for the distinct phyletic line represented by the genus <I>Kordiimonas</I>. The type strain is GW14-5<SUP>T</SUP> (=KCCM 42021<SUP>T</SUP>=JCM 12864<SUP>T</SUP>).</P>