Browsing by Author "Tounsi, Slim"
Now showing items 21-29 of 29
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Relationship between plasmid loss and gene expression in Bacillus thuringiensis
Driss, Fatma; Tounsi, Slim; Jaoua, Samir ( Springer-Verlag , 2011 , Article)The large genome of Bacillus thuringiensis was shortened by provoking plasmid loss, and the effect of such loss on the expression of both chromosomal and plasmid-harboured genes was studied. It was evidenced that the genomic ... -
Selection and characterisation of an HD1-like Bacillus thuringiensis isolate with a high insecticidal activity against Spodoptera littoralis (Lepidoptera: Noctuidae)
Azzouz, Hichem; Kebaili-Ghribi, Jihene; ben Farhat-Touzri, Dalel; Daoud, Fatma; Fakhfakh, Ines; Tounsi, Slim; Jaoua, Samir... more authors ... less authors ( John Wiley & Sons, Ltd , 2014 , Article)Spodoptera littoralis (Boisduval) larvae are known by their susceptibility to Bacillus thuringiensis subsp. aizawai strains. In order to prevent the appearance of B. thuringiensis (Bt) resistance and to develop economical ... -
Study of the Bacillus thuringiensis Vip3Aa16 histopathological effects and determination of its putative binding proteins in the midgut of Spodoptera littoralis
Abdelkefi-Mesrati, Lobna; Boukedi, Hanen; Dammak-Karray, Mariam; Sellami-Boudawara, Tahya; Jaoua, Samir; Tounsi, Slim... more authors ... less authors ( Elsevier Inc. , 2011 , Article)The bacterium Bacillus thuringiensis produces, at the vegetative stage of its growth, Vip3A proteins with activity against a broad spectrum of lepidopteran insects. The Egyptian cotton leaf worm (Spodoptera littoralis) is ... -
Susceptibility of Agrotis segetum (noctuidae) to Bacillus thuringiensis and analysis of midgut proteinases
Ben Hamadou-Charfi, Dorra; Sauer, Annette Juliane; Abdelkefi-Mesrati, Lobna; Tounsi, Slim; Jaoua, Samir; Stephan, Dietrich... more authors ... less authors ( Taylor & Francis , 2015 , Article)Seventy-eight Bacillus thuringiensis isolates were selected for a screening against the Lepidoptera species Agrotis segetum to search the higher insecticidal activity. In a preliminary bioassay, the spore-crystal mixture ... -
Synthesis of silver nanoparticles using Bacillus velezensis M3-7 lipopeptides: Enhanced antifungal activity and potential use as a biocontrol agent against Fusarium crown rot disease of wheat seedlings
Fatma, Masmoudi; Pothuvattil, Nandagopal S.; Tounsi, Slim; Saadaoui, Imen; Trigui, Mohamed ( Elsevier , 2023 , Article)Bacillus velezensis M3-7 is a hyperactive mutant, 12-fold improved in its antifungal activity, obtained during a previous study from the wild strain BLB371 after a combination of random mutagenesis and medium component ... -
Towards a new biological control approach for Photorhabdus temperata bioinsecticide production through the bioconversion of Tunisian industrial wastewater
Keskes, Sahar; Jallouli, Wafa; Sahli, Emna; Sayadi, Sami; Tounsi, Slim ( Springer , 2020 , Article)© 2020, The Author(s). A novel bioconversion approach of Tunisian wastewater to low-cost Photorhabdus temperata bioinsecticide is presented in this study. Our results showed that when cultured on the food industry wastewater ... -
Towards novel Cry toxins with enhanced toxicity/broader: a new chimeric Cry4Ba / Cry1Ac toxin
Zghal, Raida Zribi; Elleuch, Jihen; Ali, Mamdouh Ben; Darriet, Frederic; Rebaï, Ahmed; Chandre, Fabrice; Jaoua, Samir; Tounsi, Slim... more authors ... less authors ( Springer-Verlag , 2017 , Article)Attempts have been made to express or to merge different Cry proteins in order to enhance toxic effects against various insects. Cry1A proteins of Bacillus thuringiensis form a typical bipyramidal parasporal crystal and ... -
Toxin stability improvement and toxicity increase against dipteran and lepidopteran larvae of Bacillus thuringiensis crystal protein Cry2Aa
Elleuch, Jihen; Jaoua, Samir; Ginibre, Carole; Chandre, Fabrice; Tounsi, Slim; Zghal, Raida Z.... more authors ... less authors ( Wiley , 2016 , Article)BACKGROUND Bacillus thuringiensis δ-endotoxins are the most widely used biopesticides for controlling economically important crop pests and disease vectors. Improving their efficacy is of great benefit. Here, an improvement ... -
Vegetative insecticidal protein of Bacillus thuringiensis BLB459 and its efficiency against Lepidoptera
Boukedi, Hanen; Khedher, Saoussen Ben; Hadhri, Rania; Jaoua, Samir; Tounsi, Slim; Abdelkefi-Mesrati, Lobna... more authors ... less authors ( Elsevier Ltd , 2017 , Article)Bacillus thuringiensis strain BLB459 supernatant showed a promising activity against Lepidopteran pests with extremely damages in the larvae midgut. Investigations of the genes that encode secreted toxin demonstrated that ...