Browsing by Author "Jaoua, Samir"
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Characterization of bioactive compounds and ameliorative effects of Ceratonia siliqua leaf extract against CCl4 induced hepatic oxidative damage and renal failure in rats
Ben Hsouna, Anis; Saoudi, Mongi; Trigui, Mohamed; Jamoussi, Kamel; Boudawara, Tahia; Jaoua, Samir; El Feki, Abdelfattah... more authors ... less authors ( Elsevier Ltd. , 2011 , Article)Ceratonia siliqua is a typical Mediterranean plant, mainly used in food and Tunisian traditional folk medicine. Among the tested extracts, the ethyl acetate fraction (EACs) exhibited the highest total phenolic and flavonoids ... -
Characterization of the Extracellular Polymeric Substances (EPS) of Virgibacillus strains capable of mediating the formation of high Mg-calcite and protodolomite
Aldisi, Zulfa; Zouari, Nabil; Jaoua, Samir; Dittrich, Maria; Al-Kuwari, Hamad; Bontognali, Tomaso... more authors ... less authors ( Qatar University Press , 2020 , Poster)The origin of dolomite -a common carbonate mineral- is the subject of an ongoing debate. It has been proposed that extracellular polymeric substances (EPS) excreted by microbes contain specific organic molecules that ... -
Characterization of tunisian Bacillus thuringiensis strains with abundance of kurstaki subspecies harbouring insecticidal activities against the lepidopteran insect ephestia kuehniella
Saadaoui, Imen; Al-Thani, Roda; Al-Saadi, Fatma; Hassan, Najeh Belguith-Ben; Abdelkefi-Mesrati, Lobna; Schultz, Patrick; Rouis, Souad; Jaoua, Samir... more authors ... less authors ( Springer US , 2010 , Article)The study of 257 crystal-producing Bacillus thuringiensis isolates from bioinsecticide free soil samples collected from different sites in Tunisia, was performed by PCR amplification, using six primer pairs specific for ... -
Chemical composition and evaluation of antioxidant and antimicrobial activities of Tunisian Thymelaea hirsuta with special reference to its mode of action
Trigui, Mohamed; Ben Hsouna, Anis; Tounsi, Slim; Jaoua, Samir ( Elsevier B.V. , 2013 , Article)In the present study, we evaluated in vitro antimicrobial and antioxidant properties of Thymelaea hirsuta extracts as well as its phytochemical composition. Total phenolic and flavonoid contents were highest in acetone and ... -
Chemical composition, cytotoxicity effect and antimicrobial activity of Ceratonia siliqua essential oil with preservative effects against Listeria inoculated in minced beef meat
Ben Hsouna, Anis; Trigui, Mohamed; Ben Mansour, Riadh; Jarraya, Raoudha Mezghani; Damak, Mohamed; Jaoua, Samir... more authors ... less authors ( Elsevier B.V. , 2011 , Article)The present study describes the phytochemical profile and the protective effects of Ceratonia siliqua pods essential oil (CsEO), a food and medicinal plant widely distributed in Tunisia. Twenty five different components ... -
Comparative study of Bacillus thuringiensis Cry1Ia and Cry1Aa delta-endotoxins : activation process and toxicity against Prays oleae
Dammak, Mariam; Tounsi, Slim; Rousis, Souad; Jaoua, Samir ( Elsevier Inc. , 2010 , Article)Cry1Ia and Cry1Aa proteins exhibited toxicities against Prays oleae with LC(50) of 189 and 116 ng/cm(2), respectively. The ability to process Cry1Ia11 protoxin by trypsin, chymotrypsin and P. oleae larvae proteases was ... -
Considering the Specific Impact of Harsh Conditions and Oil Weathering on Diversity, Adaptation, and Activity of Hydrocarbon-Degrading Bacteria in Strategies of Bioremediation of Harsh Oily-Polluted Soils
Al Disi, Zulfa; Jaoua, Samir; Al-Thani, Dhabia; Al-Meer, Saeed; Zouari, Nabil ( Hindawi Publishing Corporation , 2017 , Article)Weathering processes change properties and composition of spilled oil, representing the main reason of failure of bioaugmentation strategies. Our purpose was to investigate the metabolic adaptation of hydrocarbon-degrading ... -
Construction of a Bacillus thuringiensis genetically-engineered strain harbouring the secreted Cry1Ia delta-endotoxin in its crystal
Dammak, Mariam; Jaoua, Samir; Tounsi, Slim ( Springer Netherlands , 2011 , Article)Unlike other Bacillus thuringiensis Cry proteins, Cry1 Ia does not form a crystal since it is a secreted delta-endotoxin. We have engineered a Cry1 Iac chimeric protein by substituting the C-terminal part of Cry1 Ia by the ... -
Correlation between delta-endotoxin and proteolytic activities produced by Bacillus thuringiensis var. kurstaki growing in an economic production medium
Ennouri, Karim; Ben Khedher, Saoussen; Jaoua, Samir; Zouari, Nabil ( Taylor & Francis , 2013 , Article)Bacillus thuringiensis is a Gram positive bacterium that produces an insecticidal crystalline protein making it one of the most important biocontrol agents for pest management. Bioinsecticides based on B. thuringiensis ... -
Correlation between synthesis variation of 2-alkylquinolones and the antifungal activity of aBurkholderia cepacia strain collection
Kilani-Feki, Olfa; Zouari, Imen; Culioli, Gerald; Ortalo-Magne, Annick; Zouari, Nabil; Blache, Yves; Jaoua, Samir... more authors ... less authors ( Springer Netherlands , 2012 , Article)Twenty epiphytic and rhizospheric bacterial strains harbouring strong antifungal activities were isolated from the Tunisian environment. This group of bacteria was identified as Burkholderia cepacia genomovar I using 16S ... -
Cry1Ac toxicity enhancement towards lepidopteran pest Ephestia kuehniella through its protection against excessive proteolysis
Elleuch, Jihen; Jaoua, Samir; Tounsi, Slim; Zghal, Raida Z. ( Elsevier , 2016 , Article)Bacillus thuringiensis has been extensively used in agroecosystems for four decades due to its high specific toxicity. Strategies based on B. thuringiensis proteins combinations for the improvement of its activity present ... -
Cry4Ba and Cyt1Aa proteins from Bacillus thuringiensis israelensis: Interactions and Toxicity mechanism against Aedes aegypti
Elleuch, Jihen; Jaoua, Samir; Darriet, Frederic; Chandre, Fabrice; Tounsi, Slim; Zribi Zghal, Raida... more authors ... less authors ( Elsevier Ltd. , 2015 , Article)Individual crystal proteins from Bacillus thuringiensis israelensis exhibit variable levels of insecticidal activities against mosquito larvae. In all cases, they are much less active compared to the whole crystal proteins ... -
Detection of multimycotoxins in camel feed and milk samples and their comparison with the levels in cow milk
Zeidan, Randa; Ul Hassan, Zahoor; Al-Naimi, Noor; Al-Thani, Roda; Jaoua, Samir ( Wiley Open Access , 2022 , Article)Camel milk has been considered as an important source of nutrients and is commercialized in many countries of the world including the Middle East. This study aimed to investigate the presence of mycotoxins in camel feed ... -
Development Of Bio-Insecticides Based On Local Qatari Bacillus Thuringiensis Strains For The Biological Control Of Harmful Dipteran Disease Vectors
Nair, Kavita Murleedharan (2019 , Dissertation)The very friendly bacterium Bacillus thuringiensis (Bt) is the main source of environment-friendly and safe bioinsecticides used in the control of plant pests and animal and human disease vectors. A collection of 441 Qatari ... -
Differential oxidative stress responses to methanol in intraperitoneally exposed rats: Ameliorative effects of Opuntia vulgaris fruit extract
Saoudi, Mongi; Hsouna, Anis Ben; Trigui, Mohamed; Jamoussi, Kamel; Jaoua, Samir; El Feki, Abdelfattah... more authors ... less authors ( SAGE Publications , 2012 , Article)Methanol is primarily metabolized by oxidation to formaldehyde and then to formate. These processes are accompanied by formation of superoxide anion and hydrogen peroxide. This article reports data on the effect of ... -
Diversity of Bacillus thuringiensis Strains From Qatar as Shown by Crystal Morphology, d-Endotoxins and Cry Gene Content
Nair, Kavita; Al-Thani, Dhabi; Al-Thani, Roda; Al-Yafei, Fatima; Ahmed, Talaat; Jaoua, Samir... more authors ... less authors ( Frontiers Media , 2018 , Article)Bacillus thuringiensis (Bt) based insecticidal formulations have been recognized as one of the most successful, environmentally safe and sustainable method of controlling insect pests. Research teams worldwide are in ... -
Effects of the P20 protein from Bacillus thuringiensis israelensis on insecticidal crystal protein Cry4Ba
Jaoua, Samir ( Elsevier B.V. , 2015 , Article)The accessory protein P20 from Bacillus thuringiensis israelensis has been defined as an important molecular chaperone for forming crystal Cyt1Aa, and enhancing Cry11Aa and Cry4Aa expression. To investigate its putative ... -
Efficacy of Lawsonia inermis leaves extract and its phenolic compounds against olive knot and crown gall diseases.
Mohamed, T.; Ben Hsouna, Anis; Hammami, Inès; Culioli, Gérald; Ksantini, Mohieddine; Tounsi, Slim; Jaoua, Samir... more authors ... less authors ( Elsevier , 2013 , Article)This study was undertaken to determine the antibacterial efficacy of the leaves extracts of Lawsonia inermis in vitro and in vivo, against the phytopathogenic bacteria Pseudomonas savastanoi pv savastanoi IVIA 1628 and ... -
Electropolymerized phenol derivatives as permselective polymers for biosensor applications
Giammario, Calia; Monti, Patrizia; Marceddu, Salvatore; Dettori, Maria A.; Fabbri, Davidé; Jaoua, Samir; O'Neill, Robert D.; Serra, Pier A.; Delogu, Giovanna; Migheli, Quirico... more authors ... less authors ( The Royal Society of Chemistry , 2015 , Article)Amperometric biosensors are often coated with a polymeric permselective film to avoid electroactive interference by reducing agents present in the target medium. Phenylenediamine and phenol monomers are commonly used to ... -
Environmental Burkholderia cepacia strain CS5 acting by two analogous alkyl-quinolones and a didecyl-phthalate against a broad spectrum of phytopathogens fungi
Kilani-Feki, Olfa; Culioli, Gerald; Ortalo-Magne, Annick; Zouari, Nabil; Blache, Yves; Jaoua, Samir... more authors ... less authors ( Springer-Verlag , 2011 , Article)An environmental Burkholderia cepacia strain named Cs5 was isolated and identified first using API biochemical identification system and then with 16S rDNA and recA sequence homology search. This bacterium exhibited a broad ...