Journal of Microbiology

Journal Articles

Chryseobacterium paludis sp. nov. and Chryseobacterium foetidum sp. nov. Isolated from the Aquatic Environment, South Korea: Miryung Kim , Yong Seok Kim , Chang Jun Cha; J. Microbiol. 2023;61(1):37-47. Published online February 1, 2023; DOI: https://doi.org/10.1007/s12275-022-00008-2

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Two novel bacterial species CJ51T and CJ63T belonging to the genus Chryseobacterium were isolated from the Upo wetland and the Han River, South Korea, respectively. Cells of these strains were Gram-stain-negative, aerobic, non-motile, rodshaped, and catalase- and oxidase-positive. Both strains were shown to grow optimally at 30 °C and pH 7 in the absence of NaCl on tryptic soy agar. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains CJ51T and CJ63T belonged to the genus Chryseobacterium and were most closely related to Chryseobacterium piperi CTMT and Chryseobacterium piscicola VQ-6316sT with 98.47% and 98.46% 16S rRNA sequence similarities, respectively. The average nucleotide identity values of strains CJ51T and CJ63T with its closely related type strains Chryseobacterium piperi CTMT and Chryseobacterium piscicola VQ-6316sT were 81.9% and 82.1%, respectively. The major fatty acids of strains CJ51T and CJ63T were iso-C15:0, iso-C17:0 3-OH and summed feature 9 ( C16:0 10-methyl and/or iso-C17:1ω9c). Menaquinone 6 (MK-6) was identified as the primary respiratory quinone in both strains. The major polar lipids of strains CJ51T and CJ63T were phosphatidylethanolamine and several unidentified amino lipids and lipids. Based on polyphasic taxonomy data, strains CJ51T and CJ63T represent novel species of the genus Chryseobacterium, for which names Chryseobacterium paludis sp. nov. and Chryseobacterium foetidum sp. nov. are proposed respectively. The type strains are CJ51T (= KACC 22749T = JCM 35632T) and CJ63T (= KACC 22750T = JCM 35633T).

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Pilin regions that select for the small RNA phages in Pseudomonas aeruginosa type IV pilus
Hee-Won Bae, Hyeong-Jun Ki, Shin-Yae Choi, You-Hee Cho, Kristin N. Parent
Journal of Virology.2025;[Epub] CrossRef
Genomic insights into multidrug and heavy metal resistance in Chryseobacterium sp. BI5 isolated from sewage sludge
Mrinmoy Patra, Anand Kumar Pandey, Suresh Kumar Dubey
Total Environment Microbiology.2025; 1(1): 100005. CrossRef
Chryseobacterium cupriresistens sp. nov., a copper-resistant bacterium isolated from soil contaminated with heavy metals in Chapala Basin, Mexico
Ivan Arroyo-Herrera, Ana Laura Reséndiz-Martínez, Brenda Román-Ponce, Joseph Guevara-Luna, Xiaoxia Zhang, Ayixon Sánchez-Reyes, Paulina Estrada-de los Santos, En Tao Wang, María Soledad Vásquez-Murrieta
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Validation List no. 212. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef

Antibiofilm effect of biofilm-dispersing agents on clinical isolates of Pseudomonas aeruginosa with various biofilm structures: Soo-Kyoung Kim , Xi-Hui Li , Hyeon-Ji Hwang , Joon-Hee Lee; J. Microbiol. 2018;56(12):902-909. Published online October 25, 2018; DOI: https://doi.org/10.1007/s12275-018-8336-4

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Pseudomonas aeruginosa, an opportunistic human pathogen, causes many biofilm-mediated chronic infections. In this study, biofilm structures of various clinical strains of P. aeruginosa isolated from hospitalized patients were examined and their influence on the biofilm-dispersing effects of chemicals was investigated. The clinical isolates formed structurally distinct biofilms that could be classified into three different groups: 1) mushroom-like, 2) thin flat, and 3) thick flat structures. A dispersion of these differently structured biofilms was induced using two biofilm-dispersing agents, anthranilate and sodium nitroprusside (SNP). Although both SNP and anthranilate could disperse all types of biofilms, the thick flat biofilms were dispersed less efficiently than the biofilms of other structures. This suggests that biofilm-dispersing agents have higher potency on the biofilms of porous structures than on densely packed biofilms.

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Effects of Anti-Pseudomonal Agents, Individually and in Combination, With or Without Clarithromycin, on Growth and Biofilm Formation by Antibiotic-Susceptible and -Resistant Strains of Pseudomonas aeruginosa, and the Impact of Exposure to Cigarette Smoke
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Mohammed Arroussi, Khaled Al-Athel, Ihsan ulhaq Toor, Ruiyong Zhang
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Ashaimaa Y. Moussa, Shaimaa Fayez, Hang Xiao, Baojun Xu
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Anthranilate Acts as a Signal to Modulate Biofilm Formation, Virulence, and Antibiotic Tolerance of Pseudomonas aeruginosa and Surrounding Bacteria
Hyeon-Ji Hwang, Xi-Hui Li, Soo-Kyoung Kim, Joon-Hee Lee, Cezar M. Khursigara
Microbiology Spectrum.2022;[Epub] CrossRef
Early plaque formation on PTFE membranes with expanded or dense surface structures applied in the oral cavity of human volunteers
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Antipathogenic Compounds That Are Effective at Very Low Concentrations and Have Both Antibiofilm and Antivirulence Effects against Pseudomonas aeruginosa
Hyeon-Ji Hwang, Heejeong Choi, Sojeong Hong, Hyung Ryong Moon, Joon-Hee Lee, Amanda G. Oglesby
Microbiology Spectrum.2021;[Epub] CrossRef
Thermoregulation of Pseudomonas aeruginosa Biofilm Formation
Suran Kim, Xi-Hui Li, Hyeon-Ji Hwang, Joon-Hee Lee, Danilo Ercolini
Applied and Environmental Microbiology.2020;[Epub] CrossRef

Review

MINIREVIEW] Korean indigenous bacterial species with valid names belonging to the phylum Actinobacteria: Kyung Sook Bae , Mi Sun Kim , Ji Hee Lee , Joo Won Kang , Dae In Kim , Ji Hee Lee , Chi Nam Seong; J. Microbiol. 2016;54(12):789-795. Published online November 26, 2016; DOI: https://doi.org/10.1007/s12275-016-6446-4

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To understand the isolation and classification state of actinobacterial species with valid names for Korean indigenous isolates, isolation source, regional origin, and taxonomic affiliation of the isolates were studied. At the time of this writing, the phylum Actinobacteria consisted of only one class, Actinobacteria, including five subclasses, 10 orders, 56 families, and 330 genera. Moreover, new taxa of this phylum continue to be discovered. Korean actinobacterial species with a valid name has been reported from 1995 as Tsukamurella inchonensis isolated from a clinical specimen. In 1997, Streptomyces seoulensis was validated with the isolate from the natural Korean environment. Until Feb. 2016, 256 actinobacterial species with valid names originated from Korean territory were listed on LPSN. The species were affiliated with three subclasses (Acidimicrobidae, Actinobacteridae, and Rubrobacteridae), four orders (Acidimicrobiales, Actinomycetales, Bifidobacteriales, and Solirubrobacterales), 12 suborders, 36 families, and 93 genera. Most of the species belonged to the subclass Actinobacteridae, and almost of the members of this subclass were affiliated with the order Actinomycetales. A number of novel isolates belonged to the families Nocardioidaceae, Microbacteriaceae, Intrasporangiaceae, and Streptomycetaceae as well as the genera Nocardioides, Streptomyces, and Microbacterium. Twenty-six novel genera and one novel family, Motilibacteraceae, were created first with Korean indigenous isolates. Most of the Korean indigenous actionobacterial species were isolated from natural environments such as soil, seawater, tidal flat sediment, and fresh-water. A considerable number of species were isolated from artificial resources such as fermented foods, wastewater, compost, biofilm, and water-cooling systems or clinical specimens. Korean indigenous actinobacterial species were isolated from whole territory of Korea, and especially a large number of species were from Jeju, Gyeonggi, Jeonnam, Daejeon, and Chungnam. A large number of novel actinobacterial species continue to be discovered since the Korean government is encouraging the search for new bacterial species and researchers are endeavoring to find out novel strains from extreme or untapped environments.

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Bioprospection of actinobacteria derived from freshwater sediments for their potential to produce antimicrobial compounds
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Taxonomic hierarchy of the phylum Firmicutes and novel Firmicutes species originated from various environments in Korea
Chi Nam Seong, Joo Won Kang, Ji Hee Lee, So Yeon Seo, Jung Jae Woo, Chul Park, Kyung Sook Bae, Mi Sun Kim
Journal of Microbiology.2018; 56(1): 1. CrossRef

Research Support, Non-U.S. Gov't

Diversity of Bacterial Community in Freshwater of Woopo Wetland: Keun Sik Baik , Seong Chan Park , Eun Mi Kim , Kyung Sook Bae , Jae-Hyung Ahn , Jong-Ok Ka , Jongsik Chun , Chi Nam Seong; J. Microbiol. 2008;46(6):647-655. Published online December 24, 2008; DOI: https://doi.org/10.1007/s12275-008-0135-x

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Diversity of bacterial community in water layer of Woopo wetland was investigated. Cultivable bacterial strains were isolated by the standard dilution plating technique and culture-independent 16S rRNA gene clones were obtained directly from DNA extracts of a water sample. Amplified rDNA restriction analysis (ARDRA) was applied onto both of the isolates and 16S rRNA gene clones. Rarefaction curves, coverage rate and diversity indices of ARDRA patterns were calculated. Representative isolates and clones of all the single isolate/clone phylotype were partially sequenced and analyzed phylogenetically. Sixty-four and 125 phylotypes were obtained from 203 bacterial isolates and 235 culture-independent 16S rRNA gene clones, respectively. Bacterial isolates were composed of 4 phyla, of which Firmicutes (49.8%) and Actinobacteria (32.0%) were predominant. Isolates were affiliated with 58 species. Culture-independent 16S rRNA gene clones were composed of 8 phyla, of which Proteobacteria (62.2%), Actinobacteria (15.5%), and Bacteroidetes (13.7%) were predominant. Diversity of 16S rRNA gene clones originated from cultivation-independent DNA extracts was higher than that of isolated bacteria.

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