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A new technique for studying the properties of biofilms has been developed, based on the phenomenon of electrorotation. Biofilms ofKlebsiella rubiacearum were formed on the surfaces of 6 μm diameter polystyrene beads, and the presence of such films was found to alter their electrorotation spectra. The effects of adding a biocide (polyhexanide) to the surrounding aqueous medium was also investigated...