Effects of Copper Sulfate and Zinc Sulfate on Cell Adhesion of Staphylococcus aureus and Aeromonas hydrophila Stemming from Different Cell Growth Phases in Aquatic Microcosm
Résumé
This study aimed at evaluating the effect of different concentrations of zinc sulfate and copper sulfate on bacterial adhesion A. hydrophila and S. aureus polyethylene at different stages of growth, different exposure times and monitor the pH and conductivity during the adhesion test. The analyzes showed that the maximum abundance of adhered cells were obtained in the lag growth phase and exponential growth phase. A negative and significant difference was observed between the abundance of adherent cells and concentrations of heavy metal salts. Indeed, in every condition of experience, it was noted that increasing the incubation period lead to a significant increase in abundance of bacterial cells adhered to polyethylene, so the increase in the concentrations of heavy metal salts significantly decreases the abundance of adherent cells. These results suggest that the incubation period, growth phase and the concentrations of heavy metal salts have an influence on the adhesion of S. aureus and A. hydrophila in polyethylene. The use of heavy metals with small concentration can be an additional process, in reduction of planktonic cells using adhesion process.
Domaines
Sciences de l'environnement
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