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

Author:

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

Affiliation:

1. Bioscience Division1and

2. 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

Abstract

ABSTRACT 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.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference32 articles.

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5. Cornell R. M. Schwertmann U. The iron oxides 1996 181 184 and 207–213. VCH Weinheim Germany.

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