Abstract:
:A strictly anaerobic, thermophilic bacterium, designated strain Y170(T), was isolated from a microbial mat colonizing thermal waters of a run-off channel created by the free-flowing waters of a Great Artesian Basin (GAB) bore well (New Lorne bore; registered number 17263). Cells of strain Y170(T) were slightly curved rods (1.2-12x0.8-1.1 mum) and stained Gram-negative. The strain grew optimally in tryptone-yeast extract-glucose medium at 70 degrees C (temperature range for growth was 55-80 degrees C) and pH 7 (pH range for growth was 5-9). Strain Y170(T) grew poorly on yeast extract as a sole carbon source, but not on tryptone (0.2 %). Yeast extract could not be replaced by tryptone and was obligately required for growth on tryptone, peptone, glucose, fructose, galactose, cellobiose, mannose, sucrose, xylose, mannitol, formate, pyruvate, Casamino acids and threonine. No growth was observed on arabinose, lactose, maltose, raffinose, chitin, xylan, pectin, starch, acetate, benzoate, lactate, propionate, succinate, myo-inositol, ethanol, glycerol, amyl media, aspartate, leucine, glutamate, alanine, arginine, serine and glycine. End products detected from glucose fermentation were acetate, ethanol and presumably CO(2) and H(2). Iron(III), manganese(IV), thiosulfate and elemental sulfur, but not sulfate, sulfite, nitrate or nitrite, were used as electron acceptors in the presence of 0.2 % yeast extract. Iron(III) in the form of amorphous Fe(III) oxhydroxide and Fe(III) citrate was also reduced in the presence of tryptone, peptone and Casamino acids, but not with chitin, xylan, pectin, formate, starch, pyruvate, acetate, benzoate, threonine, lactate, propionate, succinate, inositol, ethanol, glycerol, mannitol, aspartate, leucine, glutamate, alanine, arginine, serine or glycine. Strain Y170(T) was not able to utilize molecular hydrogen and/or carbon dioxide in the presence or absence of iron(III). Chloramphenicol, streptomycin, tetracycline, penicillin and ampicillin and NaCl concentrations greater than 2 % inhibited growth. The G+C content of the DNA was 48+/-1 mol% [sd (n=3); T(m)]. 16S rRNA gene sequence analysis indicated that strain Y170(T) is a member of the family Syntrophomonadaceae, class Clostridia, phylum Firmicutes and was most closely related to members of the genus Thermosediminibacter (mean similarity of 93.6 %). On the basis of the 16S rRNA gene sequence comparisons and physiological characteristics, strain Y170(T) is considered to represent a novel species of a new genus, for which the name Fervidicola ferrireducens gen. nov., sp. nov. is proposed. The type strain is Y170(T) (=KCTC 5610(T)=JCM 15106(T)=DSM 21121(T)).
journal_name
Int J Syst Evol Microbiolauthors
Ogg CD,Patel BKdoi
10.1099/ijs.0.004200-0subject
Has Abstractpub_date
2009-05-01 00:00:00pages
1100-7issue
Pt 5eissn
1466-5026issn
1466-5034pii
59/5/1100journal_volume
59pub_type
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