Paper Title:

Geographical Distribution and Diversity of Moderately Thermophilic Members of the Thermoplasmatales

Periodical Advanced Materials Research (Volumes 20 - 21)
Main Theme Biohydrometallurgy: From the Single Cell to the Environment
Edited by Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher
Pages 405-408
DOI 10.4028/www.scientific.net/AMR.20-21.405
Citation Rebecca Hawkes et al., 2007, Advanced Materials Research, 20-21, 405
Online since July, 2007
Authors Rebecca Hawkes, Graham O'Hara, Peter D. Franzmann, Jason J. Plumb
Keywords Acidophiles, Archaea, Ferroplasma, Organotroph, Thermoplasmatales
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Oxidation of ferrous iron by moderately thermophilic species of the genus Ferroplasma is of considerable potential value in commercial bioleaching operations. A collection of strains was enriched and isolated from a number of natural or industrial acidic sites at 45 and 55°C. Phylogenetic analysis based on 16S rRNA gene sequencing indicated that all strains were members of the Order Thermoplasmatales. Stains BH8 and BH12 showed 98% sequence similarity with Ferroplasma acidiphilum strain YT and DR1 respectively. Strains BH7 and BH10 were closely related to the moderately thermophilic species Ferroplasma cupricumulans. Strain BH9, a moderately thermophilic organotroph, was unrelated to previously described species and probably represents a novel genus. Strains BH8 and BH12 showed some unique physiological differences to the type species F. acidiphilum. Unlike F. acidiphilum, both strains were moderately thermophilic with a temperature range for strains BH8 and BH12 of 24 to 61°C and 27 to 49°C respectively. Strain BH12 grew organotrophically on Darland’s Medium containing glucose and yeast extract and chemomixotrophically on Darland’s Medium supplemented with ferrous sulphate. Moderately thermophilic species of Ferroplasma and Ferroplasma-like genera appear widely distributed geographically and possess considerable physiological and phylogenetic diversity that may benefit industrial bioleaching processes.

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