Browsing by Author "Jaoua, Samir"
Now showing items 41-60 of 95
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Erratum to: Towards novel Cry toxins with enhanced toxicity/broader: a new chimeric Cry4Ba / Cry1Ac toxin
Zribi Zghal, Raida; Elleuch, Jihen; Ben Ali, Mamdouh; Darriet, Frédéric; Rebaï, Ahmed; Chandre, Fabrice; Jaoua, Samir; Tounsi, Slim... more authors ... less authors ( Springer Verlag , 2017 , Other)The original version of this article inadvertently contained mistake. 1 Springer-Verlag GmbH Germany 2017 -
Evidence of a Role for Aerobic Bacteria in High Magnesium Carbonate Formation in the Evaporitic Environment of Dohat Faishakh Sabkha in Qatar
Al Disi, Zulfa; Jaoua, Samir; Bontognali, Tomaso R.R.; Attia, Essam S.M.; Al-Kuwari, Hamad A. Al Saad; Zouari, Nabil... more authors ... less authors ( Frontiers Media , 2017 , Article)Dolomite (MgCa(CO3)2) is an important petroleum reservoir rock mineral common in ancient sedimentary rocks which is infrequently found in modern environments. The mechanism of dolomite formation remains poorly understood, ... -
Evidence of the Involvement of E358, A498 and C571 of a New Cry1Ac δ-endotoxin of Bacillus thuringiensis in its High Insecticidal Activity Against Ephestia kuehniella
Saadaoui, Imen; Miled, Nabil; Jaoua, Samir ( Humana Press Inc , 2010 , Article)A new cry1Ac-type gene was cloned from Bacillus thuringiensis strain BLB1, sequenced and expressed. The deduced amino acid sequence of the polypeptide has a predicted molecular mass of 132.186 kDa. The amino acid sequence ... -
Evidence of two mechanisms involved in Bacillus thuringiensis israelensis decreased toxicity against mosquito larvae: Genome dynamic and toxins stability
Elleuch, Jihen; Zribi Zghal, Raida; Lacoix, Marie Noel; Chandre, Fabrice; Tounsi, Slim; Jaoua, Samir... more authors ... less authors ( Elsevier GmbH , 2015 , Article)Biopesticides based on Bacillus thuringiensis israelensis are the most used and most successful around the world. This bacterium is characterized by a dynamic genome able to win or lose genetic materials which leads to a ... -
Evidencing the diversity and needs of adjustment of the nutritional requirements for hydrocarbon-degrading activity of: Pseudomonas aeruginosa adapted to harsh conditions using 2<sup>n</sup> full factorial design
Attar, Al Zahraa; Jaoua, Samir; Ahmed, Talaat A.; Al Disi, Zulfa; Zouari, Nabil ( Royal Society of Chemistry , 2017 , Article)To overcome the partial or complete failure of oil hydrocarbon bioremediation due to weathering processes, occurring in most oil producing and spilling areas, nutritional requirements of the most widely used bacterium, ... -
Fungal and aflatoxin contamination of marketed spices
Hammami, Walid; Fiori, Stefano; Al Thani, Roda; Kali, Najet Ali; Balmas, Virgilio; Migheli, Quirico; Jaoua, Samir... more authors ... less authors ( Elsevier Ltd , 2014 , Article)Fourteen spice samples were collected from local markets in Doha, Qatar, during 2012, and were surveyed for the presence of potentially harmful mycoflora and for contamination with aflatoxins B1, B2, G1, and G2 by ... -
Heterologous expression and secretion of an antifungal Bacillus subtilis chitosanase (CSNV26) in Escherichia coli
Kilani-Feki, Olfa; Frikha, Fakher; Zouari, Imen; Jaoua, Samir ( Springer-Verlag Berlin Heidelberg , 2013 , Article)The aims of the study were the production improvement, the purification, the characterization and the activity investigation of chitosanase CSNV26 of Bacillus subtilis (V26). The gene csnV26 encoding for this protein was ... -
Hydrocarbon Degrading Candidate Bacteria Isolated From Qatar Polluted Soil and Molecular Identification of Key Enzymes Coding Genes
Saleh, Aya Ehab (2021 , Master Thesis)Sixteen bacterial strains were isolated form contaminated soils and identified as Bacillus subtilis, Bacillus circulans, Burkholderia cepacia, Pseudomonas aeruginosa, Micrococcus luteus, Raoultella ornithinolytica and ... -
Identification of phenolic compounds by HPLC/MS and in vitro evaluation of the antioxidant and antimicrobial activities of Ceratonia siliqua leaves extracts
Hsouna, Anis Ben; Trigui, Mohamed; Jarraya, Raoudha Mezghani; Damak, Mohamed; Jaoua, Samir ( Academic Jounals , 2015 , Article)Ceratonia siliqua is a typical plant of the Mediterranean area, which is mainly used as animal and human food and in folk medicine for treating some diseases such as antidiarrheal and diuretic. The present study was planned ... -
Improvement of Bacillus thuringiensis bioinsecticide production by sporeless and sporulating strains using response surface methodology
Ben Khedher, Saoussen; Kamoun, Amel; Jaoua, Samir; Zouari, Nabil ( Elsevier B.V. , 2011 , Article)Statistical experimental designs, involving a Plackett-Burman design followed by a rotatable central composite design were used to optimize the culture medium constituents for Bacillus thuringiensis bioinsecticide production. ... -
Improvement of Bioinsecticides Production by Sporeless Bacillus thuringiensis strains in Response to Various Stresses in Low Cost Medium
Ben Khedher, Saoussen; Jaoua, Samir; Zouari, Nabil ( Springer-Verlag , 2011 , Article)The use of bioinsecticides, particularly those produced by sporeless Bacillus thuringiensis strains, has been shown to be a good alternative in pest management. Two types of sporeless mutants were distinguished. The ... -
Improvement of Photorhabdus temperata bioinsecticides production in low-cost media through adequate fermentation technology
Jallouli, Wafa; Jaoua, Samir; Zouari, Nabil ( Wiley Subscription Services, Inc. , 2012 , Article)To develop a cost effective process for bioinsecticides production by Photorhabdus temperata, dissolved oxygen (DO) requirements were investigated in both the complex and the optimized media using diluted seawater as a ... -
Improvement of Photorhabdus temperata strain K122 bioinsecticide production by batch and fed-batch fermentations optimization
Jallouli, Wafa; Jaoua, Samir; Zouari, Nabil ( Springer-Verlag , 2012 , Article)Optimization of a fermentation process for bioinsecticides production by Photorhabdus temperata strain K122 was investigated into fully controlled 3-L fermenter using an optimized medium (OM). Development of large-scale ... -
Increase of the Bacillus thuringiensis secreted toxicity against lepidopteron larvae by homologous expression of the vip3LB gene during sporulation stage
Sellami, Sameh; Jamoussi, Kais; Dabbeche, Emna; Jaoua, Samir ( Springer-Verlag , 2011 , Article)The Vegetative insecticidal Vip3A proteins display a wide range of insecticidal spectrum against several agricultural insect pests. The fact that the expression of vip3 genes occurs only during the vegetative growth phase ... -
Influence of temperature, salinity and Mg:Ca ratio on microbially-mediated formation of Mg-rich carbonates by Virgibacillus strains isolated from a sabkha environment.
Al Disi, Zulfa Ali; Bontognali, Tomaso R R; Jaoua, Samir; Attia, Essam; Al-Kuwari, Hamad Al Saad; Zouari, Nabil... more authors ... less authors ( Nature Research , 2019 , Article)Studies have demonstrated that microbes facilitate the incorporation of Mg into carbonate minerals, leading to the formation of potential dolomite precursors. Most microbes that are capable of mediating Mg-rich carbonates ... -
Integration of a Recombinant Chitinase into Bacillus thuringiensis Parasporal Insecticidal Crystal
Driss, Fatma; Rouis, Souad; Azzouz, Hichem; Tounsi, Slim; Zouari, Nabil; Jaoua, Samir... more authors ... less authors ( Springer-Verlag , 2011 , Article)Chitinases have been successfully used in combination with Bacillus thuringiensis delta-endotoxins forming crystals in order to enhance their insecticidal activities. In this context, we opted for promoting the chitinase ... -
Investigation and application of Bacillus pumilus QBP344-3 in the control of Aspergillus carbonarius and ochratoxin A contamination
Nayla Salah, Higazy; Saleh, Aya Ehab; Hassan, Zahoor Ul; Al Thani, Roda; Migheli, Quirico; Jaoua, Samir... more authors ... less authors ( Elsevier Ltd , 2021 , Article)This study was designed to investigate the antifungal activity of Bacillus pumilus 344-3 against toxigenic fungi. In vitro co-incubation assay revealed that A. carbonarius AC82, A. niger AN8 and P. digitatum PD43 are most ... -
Investigation and Biological Control of Toxigenic Fungi and Mycotoxins in Dairy Cattle Feed
Alasmar, Reem Moath (2020 , Master Thesis)Mycotoxins are secondary metabolites synthesized by mycotoxigenic fungi, contaminating human and animal food and feed. Aflatoxin B1 (AFB1) and ochratoxins (OTA) are frequently detected in animal feed products causing ... -
Investigation and Biological Control of Toxigenic Fungi and Mycotoxins in Dairy Cattle Feeds
alasmar, Reem, moath; Jaoua, Samir ( Qatar University Press , 2020 , Poster)Mycotoxins, the secondary fungal metabolites are important contaminants of food and feed. Among the other contaminants, aflatoxin B1 (AFB1) and OTA are frequently detected in the animal feed product. In the present study, ... -
Investigation of Bacillus Thuringiensis Plasmid Instability and its Effect on the Synthesis of Crystals
Alwa, Amira; Jaoua, Samir ( Qatar University Press , 2020 , Poster)In order to explore plasmid instability in Bt, four Bt strains belonging to two Bt subspecies were cultured at 42°C for 9 days. HD1 and QBT376 belong to subspecies kurstaki, while H14 and QBT218 belong to subspecies ...