By K. C. Marshall (auth.), K. C. Marshall (eds.)

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Additional resources for Microbial Adhesion and Aggregation: Report of the Dahlem Workshop on Microbial Adhesion and Aggregation Berlin 1984, January 15–20

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Liquid 77~ Solid FIG. 2 - Two bacteria at a elose separation showing the increased concentration of polymer in the dotted overlap region. D~ Robb In the overlap region the concentration of polymer will be approximately double the concentration on the surface of a single bacterium. , force the particles to' separate. This is one important mechanism in preventing the indiscriminate aggregation of cells both in solution and in the adsorbed state. For cells to aggregate, some attractive interaction, usually provided by a specific mechanism, must be applied to overcome this polymerpolymer repulsion.

Particles captured by a surface in a primary minimum have a finite probability of es cape due to thermal motion and local shear forces provided by the suspension medium which is usually in some state of flow. Under these conditions it becomes very difficult to quantify the principal forces involved, especially if microroughness effects become important. Ideally, studies concerned with bacterial adhesion should be carried out under conditions of defined steady shear, using apparatus which allow direct observation of the adhering cells.

Freeman and Co. 1960. The Hydrogen Bond. B. 1977. Rubber adhesion and dweIl time effect. Wear 42: 119-133. J. 1979. Statistical theory of the adsorption of interacting chain molecules. I. Partition-function, segment density distribution, and adsorption-isotherms. J. Phys. 83: 1619-1635. F. 1981. The Effect of Polymers on Dispersion Properties, vol. 1. New York: Academic Press. ; and Kato, T. 1980. Adhesion and Adsorption of Polymers. In Polymer Seience and Technology, ed. H. Lee, vol. 12B, p. 729.

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