Adhesion of Escherichia coli and ＂Pseudomonas aeruginosa＂ on Rock Surface in Aquatic Microcosm: Assessment of the Influence of Dissolved Magnesium Sulfate and Monosodium Phosphate

Olive V. Noah Ewoti ； Moïse Nola ； Luciane M. Moungang ； Mireille E. Nougang ； François Krier ； Nour-Eddine Chihib

《Research Journal of Environmental and Earth Sciences》 3卷4期 (2011/06) Pp. 364-374

並列摘要

This study aims at assessing the aquatic microcosm conditions, the influence of MgSO_4 and NaH_2PO_4 on the adhesion of ＂P. aeruginosa＂ and ＂E. coli＂ on the basalt, micaschist, granite and sandstone fragments during 180 to 1440 min. Results showed that in the presence of MgSO_4 at concentrations of 0.02, 0.04, 0.06 and 0.08 mol/L the abundances of ＂P. aeruginosa＂ adhered on the fragments rock expressed as CFU/cm^2 which varies from 2.8×10^5 to 6.2×10^8 at 0.02 mol/L, 2.5×10^4 to 4×10^6 at 0.04 mol/L, 1.2×10^4 to 1.8×10^8 at 0.06 mol/L, and from 2.5×10^5 to 1.9×10^7 at 0.08 mol/L. ＂E. coli＂ also varies from 2.1×10^4 to 7.3×10^4 at 0.02 mol/L, 2.7×10^4 to 4.5×10^5 at 0.04 mol/L, 2.3×10^4 to 4×10^5 at 0.06 mol/L, and from 10^4 to 1.2×10^5 at 0.08 mol/L. In the presence of NaH_2PO_4, the degree of ＂P. aeruginosa＂ adherence varies from 3.8×10^4 to 4.6×10^7 at 0.02 mol/L, 1.3×10^5 to 3.4×10^7 at 0.04 mol/L, 9×10^4 to 1.9×10^7 at 0.06 mol/L, and from 5.3×10^3 to 1.4×10^7 at 0.08 mol/L. ＂E. coli＂ equally, varies from 2.8×10^4 to 1.9×10^7 at 0.02 mol/L, 7.6×10^3 to 1.6×10^7 at 0.04 mol/L, 2.2×10^4 to 2×10^7 at 0.06 mol/L, and from 1.2×10^4 to 1.7×10^5 at 0.08 mol/L. Cells adherence was significantly influenced by the mineralogical properties of rocks and the concentration of dissolved ions in the solution (p＜0.05). The presence of ＂P. aeruginosa＂ and those of ＂E. coli＂ adherence also differed significantly (p＜0.01). This would be as a result of the insertion of flagellum on their surface.

並列關鍵字

Adhesion ； aquatic microcosm ； dissolved salts ； ＂E. coli＂ ； ＂P. aeruginosa＂ ； rock