Surface hydrophobicity and dispersal of Pseudomonas aeruginosa from biofilms.

A novel method of cell culture was employed to control the growth-rate of bacterial biofilms [1]. Cell-surface hydrophobicity increased progressively with growth rate for planktonic, chemostatgrown Pseudomonas aeruginosa and also for cells, resuspended from the biofilms. Dependence of surface hydrophobicity upon growth rate was greater for the planktonic cells. Newly-formed daughter cells, shed from the biofilms, were in all cases more hydrophilic than their adherent counterparts and demonstrated only slight growth rate dependency for this property.