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Applied and Environmental Microbiology, July 2007, p. 4294-4299, Vol. 73, No. 13
0099-2240/07/$08.00+0     doi:10.1128/AEM.02658-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

A Novel Acidimicrobium Species in Continuous Cultures of Moderately Thermophilic, Mineral-Sulfide-Oxidizing Acidophiles{triangledown}

Adam A. Cleaver,{dagger} Nicolas P. Burton,{ddagger} and Paul R. Norris*

Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom

Received 14 November 2006/ Accepted 23 April 2007

A novel species of Acidimicrobium appeared to be the predominant ferrous iron oxidizer in a mixed culture that effected the continuous, efficient extraction of nickel from a mineral concentrate at 49°C, but it was not isolated in pure culture. It outcompeted Acidimicrobium ferrooxidans, which was expected to have a major role in iron oxidation in reactors gassed with air, and was outnumbered at 49°C only by the sulfur-oxidizing Acidithiobacillus caldus. Sulfobacillus species were expected to compete with Acidimicrobium species when culture aeration was enriched with carbon dioxide, but they were a minor component of the populations with and without this enrichment. Sulfobacillus thermosulfidooxidans replaced the Acidimicrobium species and Acidithiobacillus caldus when the temperature was increased to 55°C.

* Corresponding author. Mailing address: Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom. Phone: 44 2476 523733. Fax: 44 2476 523701. E-mail: P.R.Norris{at}warwick.ac.uk

{triangledown} Published ahead of print on 27 April 2007.

{dagger} Present address: R&D IS Systems, Syngenta, Bracknell, Berkshire RG42 6EY, United Kingdom.

{ddagger} Present address: John Innes Enterprises Ltd., Norwich Research Park, Colney, Norwich NR4 7UH, United Kingdom.

Applied and Environmental Microbiology, July 2007, p. 4294-4299, Vol. 73, No. 13
0099-2240/07/$08.00+0     doi:10.1128/AEM.02658-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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