Abstract
This study was aimed at evaluating the effect of aqueous extract of Eucalyptus microcorys on the bacterial cells of Salmonella typhi adhered to polythene fragment at different cell growth phases in aquatic microcosm. The cell growth phases that have been considered are the lag, exponential, stationary and decline phases. The analyzes were performed in static conditions. The duration of cell adhesion process (DCAP) used to allow cell adhesion to polythene were 3h, 6h, 9h, and 24h. Polythene fragments containing adhered bacteria of known amount were then introduced into the solution containing different extract concentrations of Eucalyptus microcorys (10,15 and 20 g.l????1). Fragments were removed after 1h, 2 h and 3h contact time with extract solution. The results revealed that the extract of Eucalyptus microcorys causes the detachment of several bacterial cells initially adhered to fragments of polythene. The degree of detachment is modulated by the phase of cell growth. The largest reduction of Salmonella typhi cells adhered to polythene was observed with cells coming from exponential and stationary growth phases and also after 3h exposure to fragments in the extract. Keywords: Salmonella typhi, Cell growth phase, Adhesion, Polythene, Eucalyptus microcorys, Aquatic microcosm.
Highlights
IntroductionBy its dual function "matter" and "environment", is a resource of capital importance for the maintenance of life (plants, animals and humans) on earth
Water, by its dual function "matter" and "environment", is a resource of capital importance for the maintenance of life on earth
8 The main objective of this study is to assess the effect of the aqueous extract of Eucalyptus microcorys on Salmonella typhi cells coming from different phases of cell growth, and adhered to polythene fragments in water
Summary
By its dual function "matter" and "environment", is a resource of capital importance for the maintenance of life (plants, animals and humans) on earth. It is essential for humans both for their food needs and for their agricultural and industrial activities. Fokouong et al / Journal of Pharmaceutical and Biological Sciences 2020;8(2):[76–83] providing them with increased resistance to disinfection, among which there is the formation of biofilms.[4] In developing countries and in Cameroon in particular, the supply of drinking water by the national water distribution company does not always follow the great demographic explosion and uncontrolled urbanization. The partial uprooting of a biofilm developed on the internal walls of the pipes can be the cause of the resuspension of potentially pathogenic microorganisms, which constitutes a health risk for consumers, by the increase in the frequency of gastro-enteric symptoms (diarrhea, vomiting).[5]
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