Effect of growth conditions and substratum composition on the persistence of coliforms in mixed-population biofilms

Article Abstract:

The growth rate and substrate composition have a long term impact on the persistence of coliforms in mixed population biofilms. The coliforms colonize surfaces under low nutrient conditions and act as inoculum for surfaces. The coliforms that have a slow growth rate show the highest survival. Ferrous metal surfaces support a large number of microorganisms. The more reactive substratum, mild steel, enhances biofilm regrowth and supports a larger number of coliforms and heterotrophic count bacteria as compared to polycarbonate substrates.

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Construction and analysis of fractional multifactorial design to study attachment strength and transfer of Listeria monocytogenes from pure or mixed biofilms after contact with solid model food

Article Abstract:

A study was conducted to establish which of the seven factors influences the adhesion strength and hence bacterial transfer between biofilms containing Listeria monocytogenes (pure and two-species biofilms) and tryptone Soya agar as a solid organic surface. The results revealed that the bacteria that resisted a chlorinated alkaline product and a glutaraldehyde- and quaternary ammonium-based disinfectant had greater adhesion strength than those determined for untreated biofilms.

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Assessment of the ability of the bioelectric effect to eliminate mixed-species biofilms

Article Abstract:

A study on the usefulness of the bioelectric effect for the elimination of water distribution system biofilms from annular reactors was conducted. The results indicated that the bioelectric effect did not have any bactericidal action either alone or when coupled with free chlorine.

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