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Baek, Kiwoon,Lee, Yung Mi,Hwang, Chung Yeon,Park, Hyun,Jung, You-Jung,Kim, Mi-Kyeong,Hong, Soon Gyu,Kim, Ji Hee,Lee, Hong Kum International Union of Microbiological Societies 2015 International journal of systematic and evolutiona Vol.65 No.1
<P>A Gram-staining-negative, yellow-pigmented, aerobic, rod-shaped and non-motile bacterium, PAMC 27130(T), was isolated from the marine sediment of the Ross Sea, Antarctica. The temperature, pH and NaCl tolerance ranges for growth were 4-20 degrees C, pH 6.0-9.0 and 0.5-5.0% (w/v) NaCl, respectively. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain PAMC 27130(T) belonged to the genus Psychroserpens and was closely related to Psychroserpens mesophilus, Psychroserpens damuponensis and Psychroserp ens burtonensis with 97.2, 94.7 and 94.2% sequence similarities, respectively. Genomic relatedness analyses based on average nucleotide identity and genome-to-genome distance showed that strain PAMC 27130(T) could be clearly distinguished from other species of the genus Psychroserpens. The genomic DNA G+C content was 32.7 mol%. The major fatty acids (>10%) were C-20:4 omega 6c (13.2%), iso-C-15:0 (12.3%), iso-C-15:1 G (11.7%) and iso-C-15:0 3-OH (10.0%). The major respiratory isoprenoid quinone was menaquinone-6 (MK-6) and the polar lipids were phosphatidylethanolamine, two unidentified aminolipids, an unidentified phospholipid, an unidentified aminophospholipid and three unidentified lipids. On the basis of genotypic and phenotypic data collected in this study, it is proposed that strain PAMC 27130(T) represents a novel species of the genus Psychroserpens, for which the name Psychroserpens jangbogonensis sp. nov. is proposed. The type strain is PAMC 27130(T) (=KCTC 42128(T)=JCM 30228(T)).</P>
Baek, Kiwoon,Choi, Ahyoung,Kang, Ilnam,Im, Mihye,Cho, Jang-Cheon International Union of Microbiological Societies 2014 International journal of systematic and evolutiona Vol.64 No.12
<P>A Gram-staining-negative, motile by flagella, non-pigmented, poly-β-hydroxybutyrate-producing, strictly aerobic and sphere-shaped bacterium, IMCC3490<SUP>T</SUP>, was isolated from a coastal seawater sample from the Antarctic Peninsula. Optimal growth of strain IMCC3490<SUP>T</SUP> was observed at 20 °C, pH 8.0 and in the presence of 2 % (w/v) NaCl. Phylogenetic analysis using 16S rRNA gene sequences indicated that strain IMCC3490<SUP>T</SUP> belonged to the genus <I>Granulosicoccus</I> in the family <I>Granulosicoccaceae</I>. The strain was closely related to <I>Granulosicoccus antarcticus</I> IMCC3135<SUP>T</SUP> (98.8 % 16S rRNA gene sequence similarity) and <I>Granulosicoccus coccoides</I> Z 271<SUP>T</SUP> (98.5 %). The DNA–DNA relatedness values between IMCC3490<SUP>T</SUP> and type strains of the two species of the genus were far lower than 70 %, which indicated strain IMCC3490<SUP>T</SUP> is a novel genomic species of the genus <I>Granulosicoccus</I>. The major fatty acids of strain IMCC3490<SUP>T</SUP> were summed feature 8 (C<SUB>18 : 1</SUB>ω7<I>c</I> and/or C<SUB>18 : 1</SUB>ω6<I>c</I>) and summed feature 3 (C<SUB>16 : 1</SUB>ω7<I>c</I> and/or C<SUB>16 : 1</SUB>ω6<I>c</I>). The isoprenoid quinone detected was ubiquinone-8 (Q-8) and predominant polar lipids were diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine. The DNA G+C content was 61.0 mol%. On the basis of phylogenetic analyses, DNA–DNA relatedness values and phenotypic data, it is suggested that strain IMCC3490<SUP>T</SUP> represents a novel species of the genus <I>Granulosicoccus</I>, for which the name <I>Granulosicoccus marinus</I> sp. nov. is proposed. The type strain is IMCC3490<SUP>T</SUP> ( = KACC 17483<SUP>T</SUP> = NBRC 109704<SUP>T</SUP>). An emended description of the genus <I>Granulosicoccus</I> is also provided.</P>
<i>Celeribacter marinus</i> sp. nov., isolated from coastal seawater
Baek, Kiwoon,Choi, Ahyoung,Kang, Ilnam,Cho, Jang-Cheon International Union of Microbiological Societies 2014 International journal of systematic and evolutiona Vol.64 No.4
<P>A Gram-staining-negative, non-motile, non-pigmented and rod-shaped bacterial strain, designated IMCC12053<SUP>T</SUP>, was isolated from coastal surface seawater of the Yellow Sea, Korea. Optimal growth of strain IMCC12053<SUP>T</SUP> was observed at 30 °C, pH 7.0 and in the presence of 2 % (w/v) NaCl. 16S rRNA gene sequence comparisons showed that strain IMCC12053<SUP>T</SUP> was most closely related to <I>Celeribacter baekdonensis</I> L-6<SUP>T</SUP> (97.5 % similarity) and <I>Celeribacter neptunius</I> H 14<SUP>T</SUP> (96.0 %). Strain IMCC12053<SUP>T</SUP> formed a robust phylogenetic clade with members of the genus <I>Celeribacter</I>. The DNA–DNA relatedness value between IMCC12053<SUP>T</SUP> and <I>C. baekdonensis</I> was far lower than 70 % (35.7–42.5 %), which indicated that strain IMCC12053<SUP>T</SUP> is a novel genomic species of the genus <I>Celeribacter</I>. The major respiratory isoprenoid quinone was ubiquinone-10 (Q-10) and major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylcholine and aminolipids. The DNA G+C content was 61.0 mol%. On the basis of genotypic and phenotypic data collected in this study, it is proposed that strain IMCC12053<SUP>T</SUP> represents a novel species of the genus <I>Celeribacter</I>, for which the name <I>Celeribacter marinus</I> sp. nov. is proposed. The type strain is IMCC12053<SUP>T</SUP> ( = KACC 17482<SUP>T</SUP> = NBRC 109702<SUP>T</SUP>).</P>
<i>Ulvibacter marinus</i> sp. nov., isolated from coastal seawater
Baek, Kiwoon,Jo, Hwanhui,Choi, Ahyoung,Kang, Ilnam,Cho, Jang-Cheon International Union of Microbiological Societies 2014 International journal of systematic and evolutiona Vol.64 No.6
<P>A Gram-stain-negative, aerobic, chemoheterotrophic, yellow, non-motile and flexirubin-positive bacterium, designated strain IMCC12008<SUP>T</SUP>, was isolated from coastal seawater of the Yellow Sea and subjected to polyphasic taxonomy. Optimal growth was observed at 25 °C, pH 7.0 and in the presence of 2 % (w/v) NaCl. Based on 16S rRNA gene sequence analysis and subsequent phylogenetic analyses, strain IMCC12008<SUP>T</SUP> belonged to the genus <I>Ulvibacter</I> of the family <I>Flavobacteriaceae</I>, with <I>Ulvibacter antarcticus</I> IMCC3101<SUP>T</SUP> (96.0 %) and <I>Ulvibacter litoralis</I> KMM 3912<SUP>T</SUP> (95.8 %) having the highest sequence similaries. The major fatty acids were iso-C<SUB>15 : 0</SUB> (26.2 %) and iso-C<SUB>15 : 1</SUB> G (10.5 %). The DNA G+C content was 38.1 mol%. Strain IMCC12008<SUP>T</SUP> contained menaquinone-6 (MK-6) as the respiratory quinone, and polar lipids comprising phosphatidylethanolamine, two unidentified aminolipids and an unknown aminophospholipid. On the basis of data collected from this study, strain IMCC12008<SUP>T</SUP> ( = NBRC 109484<SUP>T</SUP> = KCTC 32322<SUP>T</SUP>) represents a novel species of the genus <I>Ulvibacter</I>, for which the name <I>Ulvibacter marinus</I> sp. nov. is proposed.</P>
<i>Kordia</i> <i>antarctica</i> sp. nov., isolated from Antarctic seawater
Baek, Kiwoon,Choi, Ahyoung,Kang, Ilnam,Lee, Kiyoung,Cho, Jang-Cheon International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.10
<P>A Gram-staining-negative, chemoheterotrophic, yellow-pigmented, non-motile, flexirubin-negative, facultatively anaerobic bacterium, designated strain IMCC3317<SUP>T</SUP>, was isolated from a coastal seawater sample from the Antarctic Penninsula. Optimal growth of strain IMCC3317<SUP>T</SUP> was observed at 20 °C, pH 8.0 and in the presence of 2–3 % NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain IMCC3317<SUP>T</SUP> belonged to the genus <I>Kordia</I> and was closely related to <I>Kordia algicida</I> OT-1<SUP>T</SUP> (96.7 % sequence similarity) and <I>Kordia periserrulae</I> IMCC1412<SUP>T</SUP> (96.1 % sequence similarity). The major fatty acids were 10-methyl C<SUB>16 : 0</SUB> and/or iso-C<SUB>16 : 1</SUB>ω9<I>c</I>, iso-C<SUB>17 : 0</SUB> 3-OH, iso-C<SUB>15 : 0</SUB> and anteiso-C<SUB>15 : 0</SUB>. The G+C content of the genomic DNA was 35.1 mol%. The strain contained menaquinone-6 (MK-6) as the respiratory quinone. The polar lipids detected in the strain were phosphatidylethanolamine and unknown aminophospholipids, aminolipids and polar lipids. On the basis of phylogenetic distinction and differential phenotypic characteristics, it is suggested that strain IMCC3317<SUP>T</SUP> ( = KCTC 32292<SUP>T</SUP> = NBRC 109401<SUP>T</SUP>) be assigned to the genus <I>Kordia</I> as the type strain of a novel species, for which the name <I>Kordia</I> <I>antarctica</I> sp. nov. is proposed.</P>
Baek, Kiwoon,Kim, Eui-Jin,Han, Ji-Hye,Choi, Ahyoung Korean Society of Environmental Biology 2020 환경생물 : 환경생물학회지 Vol.38 No.2
As part of the research program "2018 Rapid screening and identification of freshwater microorganisms using MALDI-TOF/MS library" freshwater samples were collected from a branch of the Nakdong River. Almost 300 antibiotic-resistant bacterial strains were isolated from freshwater samples and subsequently identified by 16S rRNA gene sequencing. Seventeen strains among the isolates shared high 16S rRNA gene sequence similarity (>99.0%) with known species that were not previously recorded in Korea, and each of the isolates also formed a robust phylogenetic clade with the closest species. These species were phylogenetically diverse, belonging to four phyla, seven classes, 10 orders, and 13 genera. At the genus and class level, the previously unrecorded species belonged to Rhodovarius, Xanthobacter, and Shinella of the class Alphaproteobacteria; Ottowia, Simplicispira, and Zoogloea of Betaproteobacteria; Pseudomonas, Acinetobacter, and Shewanella of Gammaproteobacteria; Arcobacter of Epsilonproteobacteria; Sphingobacterium of Sphingobacteriia; Trichococcus of Bacilli; and Leucobacter of Actinobacteria. The previously unrecorded species were further characterized by examining their gram-staining, colony and cell morphology, biochemical properties, and phylogenetic position.