Retention of the Gram-negative bacterium SW8 on surfaces under conditions relevant to the subsurface environment: Effects of conditioning films and substratum nature

doi:10.1111/j.1574-6941.1994.tb00110.x

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Wiley InterScience

FEMS Microbiology Ecology

Volume 14 Issue 3, Pages 243 - 254

Published Online: 20 Jan 2006

Published on behalf of the Federation of European Microbiological Societies

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Retention of the Gram-negative bacterium SW8 on surfaces under conditions relevant to the subsurface environment: Effects of conditioning films and substratum nature

RenéP Schneider ^∗ ^a Bryan R Chadwick ^b Richard Pembrey ^a Jerzy Jankowski ^b Ian Acworth ^b

^a School of Microbiology and Immunology, The University of New South Wales, P.O. Box 1, 2033 Kensington, NSW, Australia ^b Groundwater Centre, The University of New South Wales, P.O. Box 1, 2033 Kensington, NSW, Australia

∗Corresponding author. Fax: (02) 313 6528.

KEYWORDS

Bacterial adhesion • Microbial transport • Conditioning film • Groundwater • Subsurface heterogeneity

ABSTRACT

Abstract Shallow (5–13 m) and deep (35–65 m) groundwaters were evaluated for their ability to generate conditioning films which affect bacterial adhesion to natural (sandstone, shale, andesite) and man-made substrata (polypropylene, stainless steel). Water contact angles indicated that all water samples produced conditioning films. Most films modified retention of the nonmotile Gram-negative bacterium SW8, but attachment of the organism did not correlate with water contact angles. Each borewater produced conditioning films with a characteristic attachment profile of SW8. Films adsorbed from standing borewaters often retained SW8 in different numbers than coatings derived from pumped bores. Groundwater chemistry was very heterogeneous and microbiological data indicated the presence of a diverse aerobic and anaerobic microbial community. These results indicate that conditioning films derived from dissolved compounds may play a significant role in controlling the interaction of bacteria with substrata in the subsurface.

(Received 1 November 1993, Revised 30 March 1994, Accepted 4 April 1994)

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1574-6941.1994.tb00110.x About DOI