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Articles by Soumya El Abed
Total Records ( 2 ) for Soumya El Abed
  Fatima Hamadi , Hassan Latrache , Hafida Zahir , Soumya El Abed , Mostafa Ellouali and Ibnsouda koraichi Saad
  The physicochemical properties (hydrophobicity, electron donor/electron acceptor properties (acid-base) of three E. coli strains have been investigated using contact angle measurements. Two conditions of culture were used: The cells were grown in Liquid Luria Bertani medium (LLB) and in Solid Luria Bertani medium (SLB). Based on free energy of interactions (ΔGiwi), we found that all E. coli strains have hydrophilic character. Moreover, the cell surface of E. coli strains is predominately electron donor and weakly electron acceptor. The relationships between electron donor/electron acceptor (acid-base) properties and surface chemical composition determined by X-ray Photoelectron Spectroscopy (XPS) were investigated. We show that the phosphate groups play the crucial role in determining the electron donor (base) property and the amine groups were responsible for decreasing the electron acceptor (acid) property. The relation between surface molecular compositions determined by modeling the XPS data and the electron donor/electron acceptors properties were also examined. High concentration of polysaccharides seems to be responsible for high electron acceptor (acid) property. Moreover, the ratio of polysaccharides/proteins could be an origin of the electron acceptor property of studied cells surface.
  Moulay Sadiki , Soumya El Abed , Hassan Barkai , Mounyr Balouiri , Fatima Zahra El Bergadi and Saad Ibnsouda Koraichi
  In this study, the effect of different Thymus vulgaris extract fractions on Cell Surface Hydrophobicity (CSH) and acid-base properties of three fungal strains (Penicillium commune (PDLd10), Penicillium commune (PDLd’’) and Thielavia hyalocarpa (PDLb3)) using contact angle measurement method was investigated. The main results demonstrated that all fractions tested are able to influence fungal cell physicochemical properties. Indeed, the methanolic and ethyl acetate fractions were effective in reducing CSH and made the cells more hydrophilic and highly electron donor (p<0.05) compared to the untreated ones. Whereas, the hexane-ethyl acetate treatment was found made them more hydrophobic and weakly donor electron compared to the control (p<0.05). It is also noted that the modification degree of microbial cell surface properties was fraction-dependent.
 
 
 
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