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Applied and Environmental Microbiology, January 2008, p. 309-311, Vol. 74, No. 1
0099-2240/08/$08.00+0     doi:10.1128/AEM.01904-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Thickness and Surface Density of Extracellular Polymers on Acidithiobacillus ferrooxidans{triangledown} ,{dagger}

Eric S. Taylor and Steven K. Lower*

The Ohio State University, 275 Mendenhall Laboratory, 125. S. Oval Mall, Columbus, Ohio 43210

Received 18 August 2007/ Accepted 26 October 2007

In vivo force microscopy measurements of Acidithiobacillus ferrooxidans revealed a repulsive force that was due to the presence of extracellular polymers on the bacterium's surface. Measured force-distance profiles were fit to steric force theory to estimate the density and thickness values of these exopolymers. The polymer densities were 3.4 x 1016 to 7.1 x 1016 molecules m–2, and the equilibrium thickness was 29 nm.

* Corresponding author. Mailing address: The Ohio State University, 275 Mendenhall Laboratory, 125. S. Oval Mall, Columbus, OH 43210. Phone: (614) 292-1571. Fax: (614) 292-7688. E-mail: Lower.9{at}osu.edu

{triangledown} Published ahead of print on 2 November 2007.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, January 2008, p. 309-311, Vol. 74, No. 1
0099-2240/08/$08.00+0     doi:10.1128/AEM.01904-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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