Journal of Microbiology

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Flaviflexus equikiangi sp. nov. isolated from faeces of Equus kiang (Tibetan wild ass) and carrying a class 1 integron gene cassette in its genome: Caixin Yang , Xingxing Lian , Yanpeng Cheng , Yifan Jiao , Jing Yang , Kui Dong , Shan Lu , Xin-He Lai , Dong Jin , Han Zheng , Ji Pu , Suping Wang , Liyun Liu , Jianguo Xu; J. Microbiol. 2022;60(6):585-593. Published online April 18, 2022; DOI: https://doi.org/10.1007/s12275-022-1673-3

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Abstract: Two Gram-stain-positive, catalase-negative, non-spore-forming, cocci-shaped strains (dk850T and JY899) were isolated from the feces of Equus kiang in the Qinghai-Tibet Plateau of China. 16S rRNA gene sequence-based phylogenetic analyses showed that strains dk850T and JY899 belong to the genus Flaviflexus, closest to F. salsibiostraticola KCTC 33148T, F. ciconiae KCTC 49253T and F. huanghaiensis H5T. The DNA G + C content of strain dk850T was 62.9%. The digital DNADNA hybridization values of strain dk850T with the closely related species were below the 70% threshold for species demarcation. The two strains grew best at 28°C on brain heart infusion (BHI) agar with 5% sheep blood. All strains had C18:1ω9c and C16:0 as the major cellular fatty acids. MK-9(H4) was the major menaquinone in strain dk850T. The major polar lipids included diphosphatidylglycerol and an unidentified phospholipid. Strains dk850T and JY899 were identified as carrying a class 1 integron containing the aminoglycoside resistance gene aadA11, both strains were resistant to spectinomycin and streptomycin. Based on several lines of evidence from phenotypic and phylogenetic analyses, strains dk850T and JY899 represent a novel species of the genus Flaviflexus, for which the name Flaviflexus equikiangi sp. nov. is proposed. The type strain is dk850T (= CGMCC 1.16593T = JCM 33598T).

Mesorhizobium denitrificans sp. nov., a novel denitrifying bacterium isolated from sludge: Muhammad Zubair Siddiqi , Ngo Thi Phuong Thao , Gyumin Choi , Dae-Cheol Kim , Young-Woo Lee , Sang Young Kim , Ji-Hyang Wee , Wan-Taek Im; J. Microbiol. 2019;57(4):238-242. Published online March 30, 2019; DOI: https://doi.org/10.1007/s12275-019-8590-0

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A Gram-stain-negative, non-spore-forming, facultative, rodshaped bacterium (designated LA-28T) was isolated from a sludge sample from a wastewater treatment plant in Hanam city, Republic of Korea. On the basis of 16S rRNA gene sequencing, strain LA-28T clustered with species of the genus Mesorhizobium and appeared closely related to M. jarvisii LMG 28313T (96.8%), M. waimense ICMP 19557T (96.7%), and M. huakuii LMG 14107T (96.7%). Growth occurs at 18– 40°C on R2A medium in the presence of 1–4% NaCl (w/v) and at pH 6–8. The DNA G+C content was 61.2 mol%, and the predominant quinone was ubiquinone-10 (Q-10). The major cellular fatty acids (> 5%) were C16:0, C19:0 ω8c cyclo, C18:1 ω7c 11-methyl, and C18:1 ω7c and/or C18:1 ω6c (summed feature 8). Major polar lipids were phosphatidylglycerol (PG), phosphatidylethanolamine (PE), phosphatidyl-N-methylethanolamine (PME), and phosphatidylcholine (PC). Physiological and biochemical characteristics indicated that strain LA-28T represents a novel species of the genus Mesorhizobium, for which the name Mesorhizobium denitrificans sp. nov. is proposed. The type strain is LA-28T (= KACC 19675T = LMG 30806T).

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Rhodoferax koreense sp. nov, an obligately aerobic bacterium within the family Comamonadaceae, and emended description of the genus Rhodoferax: Mohamed El-Agamy Farh , Yeon-Ju Kim , Priyanka Singh , Sun Young Jung , Jong-Pyo Kang , Deok-Chun Yang; J. Microbiol. 2017;55(10):767-774. Published online September 28, 2017; DOI: https://doi.org/10.1007/s12275-017-7033-z

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Abstract

Gram-staining-negative, uniflagellated, rod-shaped, designated as DCY110T, was isolated from sludge located in Gangwon province, Republic of Korea. The phylogenetic tree of 16S rRNA gene sequence showed that the strain DCY110T belonged to the genus Rhodoferax with a close similarity to Rhodoferax saidenbachensis DSM 22694T (97.7%), Rhodoferax antarcticus DSM 24876T (97.5%), Rhodoferax ferrireducens DSM 15236T (97.3%), and Rhodoferax fermentans JCM 7819T (96.7%). The predominant isoprenoid quinine was ubiquinone (Q-8). DNA G + C content was 62.8 mol%. The major polar lipids were phosphatidylethanolamine and two unidentified phospholipids. The major fatty acids (> 10%) were C12:0, C16:0, summed feature 3 (which comprised C16:1 ω7c and/or C16:1 ω6c). The DNA-DNA relatedness values between the strain DCY110T and the closely related relatives used in this study were lower than 70%. Based on the following polyphasic analysis, the strain DCY110T is considered as a novel species of the genus Rhodoferax, for which the name Rhodoferax koreense sp. nov. is proposed. The type strain is DCY- 110T (= KCTC 52288T = JCM 31441T).

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Isolation, Characterization, and Abundance of Filamentous Members of Caldilineae in Activated Sludge: Dae-No Yoon , Soo-Je Park , So-Jeong Kim , Che Ok Jeon , Jong-Chan Chae , Sung-Keun Rhee; J. Microbiol. 2010;48(3):275-283. Published online June 23, 2010; DOI: https://doi.org/10.1007/s12275-010-9366-8

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Abstract: Chloroflexi are currently believed to serve as backbone forming agents in the activated sludge of wastewater treatment plants (WWTPs). In this study, we isolated and characterized filamentous bacteria in the class Caldilineae of the phylum Chloroflexi in municipal WWTPs. Diversity analysis using Chloroflexi-specific 16S rRNA gene clone libraries showed that 97% of the clones belonged to the subdivision Anaerolineae comprising the two classes Anaerolineae (95%) and Caldilineae (2%). Clones of Caldilineae were related to a thermophilic filament Caldilinea aerophila with 93% 16S rRNA gene sequence similarity. We obtained filamentous isolates classified into the class Caldilineae showing the best match to C. aerophila with 89% 16S rRNA gene sequence similarity. Isolates showed no ability to assimilate glucose or N-acetylglucosamine or to degrade biopolymers which were observed in filamentous Chloroflexi of WWTPs. The assessment of relative abundance based on quantitative PCR of the 16S rRNA gene indicated that members of the class Caldilineae comprised 12-19% of the Chloroflexi in the activated sludge. Additionally, fluorescence in situ hybridization experiments showed that diverse filamentous Caldilineae inhabit the activated sludge of municipal WWTPs. These findings yield insight into the role of filamentous mesophilic Caldilinea in stabilizing flocs of activated sludge in a wide range of WWTPs.

Tsukamurella sunchonensis sp. nov., a Bacterium Associated with Foam in Activated Sludge: Chi Nam Seong , Young Sook Kim , Keun Shik Baik , Sang Ki Choi , Min Bae Kim; J. Microbiol. 2003;41(2):83-88.

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Abstract: aeration basin of an activated sludge process, was clarified by phenotypic, chemotaxonomic and phylogenetic analyses. The strain possesses wall chemotype IV, MK-9(H_0 ), as the major menaquinone, and contains saturated, monounsaturated and 10-methyl branched fatty acids. The G+C content of its DNA is 68.1 mol%. Phenotypic data and DNA relatedness to known species indicate that the strain SCNU5^T represents a new species within the genus Tsukamurella, for which we propose the name Tsukamurella sunchonensis sp. nov. The type strain of T. sunchonensis is SCNU5^T (=KCTC 9827^T ).

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