Metals tolerance in moderately thermophilic isolates from a spent copper sulfide heap, closely related to Acidithiobacillus caldus, Acidimicrobium ferrooxidans and Sulfobacillus thermosulfidooxidans |
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Authors: | E L J Watkin S E Keeling F A Perrot D W Shiers M-L Palmer and H R Watling |
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Institution: | (1) Parker Centre for Integrated Hydrometallurgy Solutions, School of Biomedical Sciences, Curtin University of Technology, Bentley, WA, 6845, Australia;(2) Parker Centre for Integrated Hydrometallurgy Solutions, CSIRO Minerals, Karawara, WA, 6152, Australia;(3) Present address: MAF Biosecurity New Zealand, PO Box 40742, Upper Hutt, 5018, New Zealand;(4) Present address: Division of Children’s Leukaemia and Cancer Research Telethon Institute for Child Health Research, Subiaco Perth, WA, 6008, Australia |
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Abstract: | Selective enrichments enabled the recovery of moderately thermophilic isolates with copper bioleaching ability from a spent
copper sulfide heap. Phylogenetic and physiological characterization revealed that the isolates were closely related to Sulfobacillus thermosulfidooxidans, Acidithiobacillus caldus and Acidimicrobium ferrooxidans. While isolates exhibited similar physiological characteristics to their corresponding type strains, in general they displayed
similar or greater tolerance of high copper, zinc, nickel and cobalt concentrations. Considerable variation was found between
species and between several strains related to S. thermosulfidooxidans. It is concluded that adaptation to metals present in the bioleaching heap from which they were isolated contributed to but
did not entirely explain high metals tolerances. Higher metals tolerance did not confer stronger bioleaching performance,
suggesting that a physical, mineralogical or chemical process is rate limiting for a specific ore or concentrate. |
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Keywords: | Sulfobacillus thermosulfidooxidans Acidithiobacillus caldus Acidimicrobium ferrooxidans Bioleaching Heavy metal tolerance |
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