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Applied and Environmental Microbiology, October 2001, p. 4448-4453, Vol. 67, No. 10
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.10.4448-4453.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Growth of Pseudomonas mendocina on Fe(III) (Hydr)Oxides

L. E. Hersman,1,* J. H. Forsythe,1 L. O. Ticknor,2 and P. A. Maurice

Bioscience Division1 and Decision Applications Division,2 Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, Indiana 465562

Received 20 February 2001/Accepted 8 July 2001

Although iron (Fe) is an essential element for almost all living organisms, little is known regarding its acquisition from the insoluble Fe(III) (hydr)oxides in aerobic environments. In this study a strict aerobe, Pseudomonas mendocina, was grown in batch culture with hematite, goethite, or ferrihydrite as a source of Fe. P. mendocina obtained Fe from these minerals in the following order: goethite > hematite > ferrihydrite. Furthermore, Fe release from each of the minerals appears to have occurred in excess, as evidenced by the growth of P. mendocina in the medium above that of the insoluble Fe(III) (hydr)oxide aggregates, and this release was independent of the mineral's surface area. These results demonstrate that an aerobic microorganism was able to obtain Fe for growth from several insoluble Fe minerals and did so with various growth rates.

* Corresponding author. Mailing address: Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Mail Stop M888, Los Alamos, NM 87545. Phone: (505) 667 2779. Fax: (505) 665-3024. E-mail: hersman{at}lanl.gov.

Applied and Environmental Microbiology, October 2001, p. 4448-4453, Vol. 67, No. 10
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.10.4448-4453.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Dhungana, S., Anthony, C. R. III, Hersman, L. E. (2007). Effect of Exogenous Reductant on Growth and Iron Mobilization from Ferrihydrite by the Pseudomonas mendocina ymp Strain. Appl. Environ. Microbiol. 73: 3428-3430 [Abstract] [Full Text]  


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