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A strictly aerobic bacterium, strain Fail4T, was isolated from free-flowing geothermal waters of a bore (bore register no. 3768) tapping the Great Artesian Basin of Australia. The non-sporulating, Gram-negative cells of strain Fail4T produced light-pink colonies, were rod-shaped (1 x 1.5-4 microm) and were motile by a single polar flagellum. Strain Fail4T grew optimally at 41 degrees C at a pH of 7.0 and had an absolute requirement for yeast extract. The strain grew on casein hydrolysate, tryptone, gelatin, xylose and acetate in a medium supplemented with 0.06 or 0.006% yeast extract. Weak acid production was detected from glucose and arabinose. Catalase was produced. Nitrite was produced from nitrate. Strain Fail4T was sensitive to antibiotics that inhibit growth of bacteria. The G + C content was 63.5 +/- 0.5 mol%. Strain Fail4T was a member of the class 'Alphaproteobacteria', phylum Proteobacteria, placed almost equidistantly between Methylobacterium species, Chelatococcus asaccharovorans and Bosea thiooxidans (similarity value of 93%) as its nearest phylogenetic relatives. Phylogenetic and phenotypic evidence suggest that strain Fail4T (=ATCC BAA-295T = DSM 14364T) should be placed as the type strain of a species in a newly created genus, for which the name Microvirga subterranea gen. nov., sp. nov. is proposed.
Kanso et al. (Sat,) studied this question.
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