Flexistipes sinusarabici,a novel genus and species of eubacteria occurring in the Atlantis II Deep brines of the Red Sea |
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Authors: | Gerhard Fiala Carl R Woese Thomas A Langworthy Karl O Stetter |
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Institution: | (1) Lehrstuhl für Mikrobiologie, Universität Regensburg, Universitätsstrasse 31, D-8400 Regensburg, Federal Republic of Germany;(2) Department of Microbiology, University of Illinois at Urbana-Champaign, 61801 Urbana, IL, USA;(3) Department of Microbiology, School of Medicine, University of South Dakota, 57069 Vermillion, SD, USA |
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Abstract: | Four isolates of a gram-negative flexible bacterium have been obtained from brine water samples of the Atlantis II Deep of the Red Sea at a depth of 2000 m. One isolate (MAS 10) was studied in detail. Cells are nonmotile, flexible rods, measuring about 0.3 m in width and 5 to 50 m in length. The new organisms are heterotrophs growing anaerobically on yeast extract, meat extract, peptone, tryptone, and, less efficiently, on acetate and casamino acids. Growth occurs between 30% and 53°C at pH 6 to 8 in the presence of at least 3% NaCl. The shortest doubling time is 8.5 h under optimal growth conditions. Cells are sensitive to the antibiotics penicillin, ampicillin, vancomycin, and streptomycin, but resistant to tetracyclin and rifamipicin. The GC-content of the DNA is 39 mol%. Based on their 16S rRNA the new isolates group with the general cluster of eubacterial phyla. Since they show no specific relationship to any of them, a new genus is described, which is named Flexistipes, the flexible stick. Type species is Flexistipes sinusarabici strain MAS 10 (DSM 4947). |
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Keywords: | Flexistipes Eubacteria Atlantis II Deep brines Red Sea |
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