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Behavior ofPseudomonas fluorescens within the hydrodynamic boundary layers of surface microenvironments

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Abstract

Phase, darkfield, and computer-enhanced microscopy were used to observe the surface microenvironment of flow cells during bacterial colonization. Microbial behavior was consistent with the assumptions used previously to derive surface colonization kinetics and to calculate surface growth and attachment rates from cell number and distribution. Surface microcolonies consisted of closely packed cells. Each colony contained 2n cells, where n is the number of cell divisions following attachment. Initially, cells were freely motile while attached, performing circular looping movements within the plane of the solid-liquid interface. Subsequently, cells attached apically, maintained a fixed position on the surface, and rotated. This type of attachment was reversible and did not necessarily lead to the formation of microcolonies. Cells became irreversibly attached by progressing from apical to longitudinal attachment. Longitudinally attached cells increased in length, then divided, separated, moved apart laterally, and slid next to one another. This resulted in tight cell packing and permitted simultaneous growth and adherence. After approximately 4 generations, individual cells emigrated from developing microcolonies to recolonize the surface at new locations. Surface colonization byPseudomonas fluorescens can thus be subdivided into the following sequential colonization phases: motile attachment phase, reversible attachment phase, irreversible attachment phase, growth phase, and recolonization phase.

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Authors and Affiliations

  1. Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

    John R. Lawrence

  2. Department of Applied Microbiology and Food Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

    Darren R. Korber

Authors
  1. John R. Lawrence
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  2. Pascal J. Delaquis
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  3. Darren R. Korber
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  4. Douglas E. Caldwell
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Lawrence, J.R., Delaquis, P.J., Korber, D.R. et al. Behavior ofPseudomonas fluorescens within the hydrodynamic boundary layers of surface microenvironments. Microb Ecol 14, 1–14 (1987). https://doi.org/10.1007/BF02011566

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