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Articles by Hassan Barkai
Total Records ( 3 ) for Hassan Barkai
  Fadoua Bennouna , Saad Ibnsouda Koraichi , Hassan Barkai , Yassir Lekbach , Soumya El Abed and Mohammed Lachkar
  Background and Objective: The hydrophobicity and electron donor-electron acceptor properties of wood are considered an important parameters for microbial adhesion and wood degradation. Thus, the physicochemical properties of various wood species before and after treatment with Mentha pulegium, Rosmarinus officinalis and Cananga odorata essential oils were assessed. Materials and Methods: The hydrophobicity, electron acceptor (γ+) and electron donor (γ‾) properties of untreated and treated wood were determined using contact angle measurement. Results: All wood species tested have an electron donor character γ‾ higher than electron acceptor character γ+ and were characterized as having hydrophobic character except dibetou and beech woods which exhibit a hydrophilic character. The degree of hydrophobicity has decreased considerably using Mentha pulegium essential oil with values of water contact angles varying between 14.80±0.06 and 34.20±0.45°C followed by Cananga odorata and Rosmarinus officinalis essential oils with values of water contact angles ranged from 27.70±1.54° to 49.80±0.45° and from 37.00±0.35° to 58.90±0.45°, respectively. Conclusion: In this study, the hydrophobicity and the electron donor-electron acceptor properties have changed after treatment of wood species surfaces with the three essential oils.
  Douaae Ou-yahia , Kawtar Fikri-Benbrahim , Yassir Lekbach , Fadoua Bennouna , Hassan Barkai and Saad Ibnsouda Koraichi
  Background and Objective: The understanding of bacterial adhesion and its effect on the properties of material surfaces in seawater is the key to mitigate biofilm formation and biofouling. Therefore, the objective of this work was to evaluate the impact of several marine bacterial strains on the physico-chemical properties of stainless steel materials. Materials and Methods: We firstly investigated the adhesion ability of 6 bacterial strains isolated from seawater in the port of Nador Aït Nsar (Morocco), on 304 and 316 sea-immersed stainless steels. Secondly, we evaluated the adhesion effect of combination of all isolated strains on physico-chemical characteristics of stainless steel surfaces. Results: The molecular identification of isolated strains indicated that these strains were Pseudomonas stutzeri (KP307770.1), Bacillus amyloliquefaciens (KJ767387.1), Bacillus velezensis (CP024897.1), Bacillus subtilis (KX827606.1), Serratia odorifera (NR_037110.1) and Exiguobacterium sibirricum (CP001022.1). The contact angle measurements of bacterial cells showed that all the strains had a hydrophilic character with ΔGiwi ranging from 17.02 to 32.80 mJ m2, strong electron donating (γ) and weak electron accepting (γ+) potentials. For substrates surfaces, we found that both sea-immersed stainless steels were hydrophilic and presented strong electron-donor and weak electron-acceptor characters. The analysis of images obtained by environmental scanning electron microscopy showed that bacterial cells were able to adhere on both sea-immersed stainless steels. The experimental results also revealed that the properties of stainless steels surfaces were significantly changed following the adhesion of cells. Conclusion: The adhesion of bacterial strains on the stainless steel surfaces resulted in changing of the physico-chemical properties of these materials.
  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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