The sporeforming, dissimilatory sulfate-reducing bacteria have been reclassified by L. L. Campbell and J. R. Postgate (Bacteriol. Rev. 29:359, 1965) and placed in a new genus: Desuljbtomaculum. The thermophilic sulfate-reducing bacterium, Desulfotomaculum nigrificans (Clostridium nigrificans) was designated as the type species. In a previous study of 30 strains of nonsporulating sulfate-reducin...

A borehole drilled to a total depth of 6779 m in granitic rock in Gravberg, Sweden, was sampled and examined for the presence of anaerobic, thermophilic, fermenting bacteria and sulfate-reducing bacteria. Growth in enrichment cultures was obtained only from water samples collected from a specific sampling depth in the borehole (3500 m). The hole was cased down to a depth of 5278 m and open to t...

Two representative thermophilic bacterial strains (T1 and T2) were isolated from a one-stage autothermal thermophilic aerobic digestion pilot-scale reactor. 16S rRNA gene analysis indicated that they were Hydrogenophilaceae and Xanthomonodaceae. These isolated strains were inoculated separately and/or jointly in sewage sludge, to investigate their effects on sludge stabilization under thermophi...

Several isolates of Gram-positive, acidophilic, moderately thermophilic, ferrous-iron- and mineral-sulphide-oxidizing bacteria were examined to establish unequivocally the characteristics of Sulfobacillus-like bacteria. Two species were evident: Sulfobacillus thermosulfidooxidans with 48-50 mol% G+C and Sulfobacillus acidophilus sp. nov. with 55-57 mol% G+C. Both species grew autotrophically an...

Industrial-scale biofuel production requires robust enzymatic cocktails to produce fermentable sugars from lignocellulosic biomass. Thermophilic bacterial consortia are a potential source of cellulases and hemicellulases adapted to harsher reaction conditions than commercial fungal enzymes. Compost-derived microbial consortia were adapted to switchgrass at 60°C to develop thermophilic biomass-d...

BACKGROUND AND OBJECTIVES Thermophilic bacteria are less studied but important group of microorganisms due to their ability to produce industrial enzymes. MATERIALS AND METHODS In this study, thermophilic bacteria were isolated from hot spring of Tarabalo, India. A bacterium that could tolerate high temperatures was characterized by morphology, biochemistry and sequencing of its 16S rRNA gene...

Natural microbial consortia from hot spring samples were used to developed thermophilic mixed cultures for biohydrogen production from cassava starch processing wastewater (CSPW). Significant hydrogen production potentials were obtained from three thermophilic mixedculturesnamelyPK,SWandPRwithmaximumhydrogenproductionyieldsof249.3, 180 and 124.9 mL H2/g starch, respectively from raw cassava sta...

With the increasing demand for industrial enzymes with novel properties, the production of enzymes tolerant to extreme conditions has also increased. Due to their unique macromolecular properties, thermophiles possess high metabolic rates, physically and chemically stable enzymes and higher end product yields than similar mesophilic species. Actinomycetes are bacteria which require minimal nutr...

In raw sludges and in mesophilically and thermophilically digested anaerobic sludges, large variations in numbers of viruses occurred over narrow ranges of numbers of fecal coliforms, total coliforms, and fecal streptococci, demonstrating that the bacteria were poor quantitative reflectors of the numbers of the viruses detected. Mesophilic and thermophilic digestion of anaerobic sludges destroy...

The inactivation of fecal coliforms in anaerobic batch reactors has been investigated at the thermophilic temperatures of 50, 55 and 60 °C. Throughout inactivation experiments at each temperature, individual colonies were isolated and identified by 16S rDNA gene sequencing to illustrate how the diversity of fecal coliforms is affected by thermophilic treatment. Results indicate that even though...