Abstract
Na.tro.no.lim.no'bi.us. Arabic n. natrun or natron soda, sodium carbonate; Gr. n. limnos lake; Gr. masc. n. bios life; N.L. masc. n. Natronolimnobius , organism living in a soda lake. Euryarchaeota / Halobacteria / Natrialbales / Natrialbaceae / Natronolimnobius Natronolimnobius Itoh, Yamaguchi, Zhou and Takashina 2005b 1744 VP is a haloalkaliphic archaeal genus placed in the family Natrialbaceae of the order Natrialbales . At present, there are two validated species, Natronolimnobius baerhuensis (the type species of the genus) and Natronolimnobius innermongolicus . In addition, several strains yet to be described taxonomically are known. Based on 16S rRNA phylogenetic analysis, its closest relatives are the genera Natronorubrum and Natrinema/Haloterrigena . Cells of the genus Natronolimnobius are red‐pigmented, rod‐shaped, or pleomorphic flat‐shaped, and stain Gram‐negative. They are strictly aerobic oxidase‐ and catalase‐positive chemoorganotrophs that require at least 1.5 M NaCl for growth. Cells lyse in less than 0.5 M NaCl solution. Growth is possible at a range of neutral to alkaline pH (pH 7.5–10.0) and moderate temperature (19–54 °C). Polar lipids are diphytanyl (C20:C20) and phytanyl‐sesterterpanyl (C20:C25) derivatives of phosphatidylglycerol (PG) and phosphatidylglycerophosphate methyl ester (PGP‐Me) as major components. In addition, Natronolimnobius baerhuensis contains an unidentified phospholipid. Glycolipids are not detected. DNA G + C content (mol%) : 59–63 mol% (HPLC), 60–64 (draft genome sequences). Type species : Natronolimnobius baerhuensis .
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