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Int J Syst Evol Microbiol 56 (2006), 2757-2760; DOI  10.1099/ijs.0.64460-0
© 2006 International Union of Microbiological Societies

Runella limosa sp. nov., isolated from activated sludge

Seung Hyun Ryu1, Thi Thu Hien Nguyen1, Woojun Park2, Chang-Jin Kim3 and Che Ok Jeon1

1 Division of Applied Life Science, EB-NCRC, PMBBRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
2 Division of Environmental Science and Ecological Engineering, Korea University, Seoul 136-701, Republic of Korea
3 Korea Research Institute of Bioscience and Biotechnology, 52 Oeundong, Yusong, Daejeon 305-333, Republic of Korea

Correspondence
Che Ok Jeon
cojeon{at}gnu.ac.kr

A Gram-negative bacterium, designated strain EMB111T, was isolated from activated sludge performing enhanced biological phosphorus removal in a sequencing batch reactor. Cells were long and rod-shaped. The isolate was strictly aerobic and non-motile. The strain grew optimally at 25–30 °C and pH 7.5–8.0. The predominant fatty acids of strain EMB111T were iso-C15 : 0, C16 : 1{omega}5c, iso-C17 : 0 3-OH, iso-C15 : 0 3-OH, C16 : 0 3-OH, C16 : 0 and summed feature 3 (C16 : 1{omega}7c and/or iso-C15 : 0 2-OH). The strain contained a large amount of phosphatidylglycerol and small amounts of two unknown phospholipids (PL1, PL2) as the polar lipids. The major isoprenoid quinone was menaquinone-7. The G+C content of the genomic DNA was 42.7 mol%. Phylogenetic analysis showed that strain EMB111T formed a phyletic cluster with members of the genus Runella within the family Flexibacteraceae and was most closely related to Runella slithyformis ATCC 29530T with a 16S rRNA gene sequence similarity of 94.8 %. On the basis of chemotaxonomic data and molecular properties, strain EMB111T represents a novel species within the genus Runella, for which the name Runella limosa sp. nov. is proposed. The type strain is EMB111T (=KCTC 12615T=DSM 17973T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain EMB111T is DQ372985.

A transmission electron micrograph showing the general morphology of negatively stained cells of strain EMB111T is available as a supplementary figure in IJSEM Online.




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S. Lu, J. R. Lee, S. H. Ryu, B. S. Chung, W.-S. Choe, and C. O. Jeon
Runella defluvii sp. nov., isolated from a domestic wastewater treatment plant
Int J Syst Evol Microbiol, November 1, 2007; 57(11): 2600 - 2603.
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