By John R. Lawrence, D. R. Korber, G. M. Wolfaardt (auth.), J. Gwynfryn Jones (eds.)

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A similar phenomenon was observed during the metabolism of polychlorinated biphenyls (Krockel and Focht, 1987), furfural (Knight et ai .. 1990), and various other contaminants. In the case of furfural, a Desulfovibrio species was responsible for the primary degradation of furfural to acetic acid, while a methanogenic bacterium was responsible for the conversion of acetate and methanol to methane. Schmidt et at. (1992) described three organisms subsisting as commensals on metabolic by-products of Bacillus cereus when 2,4-dinitrophenol was provided as the sole carbon source.

Similarly, extensive aggregation during the development of V. parahaemolyticus microcolonies has been described (Fig. , 1992). Cell aggregates were still evident in the form of distinct microcolonies attached to the surface at the base of the V. , 1991). The architecture of these biofilms was also influenced by cell migration, a phenomenon apparent during the development of a diffuse basal layer with numerous channels. The nature of cellular interactions in biofilm formation may be further investigated through the use of nonmotile mutants.

16 John R. Lawrence et al. attached cells; motile daughter cells were released from these mother cells at regular intervals. , motile daughter cells were released that subsequently reattached at vacant surface sites and underwent growth and release of their own daughter cells. An additional variation on this behavioral theme was reported by Power and Marshall (1988), who described Vibrio MH3 that grew associated with the surface but completed cell division in the planktonic state. Lawrence et at.

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