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Bacillus thuringiensis strain QBT220 pBtoxis plasmid structural instability enhances δ-endotoxins synthesis and bioinsecticidal activity

Nair, K.; Nair, Kavita; Al-Thani, Roda; Jaoua, Samir ( Academic Press , 2021 , Article)

Bacillus thuringiensis subsp. israelensis (Bti) spherical parasporal crystal contains several insecticidal proteins used as environmentally safe alternative to toxic chemical pesticides. The exploration of a Bti strain ...

Application of scanning electron microscopy and MALDI-TOF MS in the exploration of the parasporal insecticidal crystals of Bacillus thuringiensis strains isolated from Qatar soil

Al-Thani, A.; Al-Thani, Aldana; Ashfaq, Mohammad Yousaf; Al-Thani, Roda; Hassan, Zahoor Ul; ... more authors ... less authors ( Elsevier Ltd , 2022 , Article)

Bacillus thuringiensis (Bt) plays an important role in health and agriculture due to its insecticidal activities. In this study, six Bt strains isolated from Qatar soil were used to explore their crystals morphologies and ...

Investigation of novel bacteriocin producers of Bacillus thuringiensis and partial characterization of two new bacteriocins: Thuricin 466 and thuricin 4Q7

Minoli Nitin, Doshi; Badr, Kareem; Ejaz, Muhammad; Hassan, Zahoor Ul; Jaoua, Samir ( Elsevier Ltd , 2024 , Article)

This study assessed the bacteriocin-producing capability of 140 strains of Bacillus thuringiensis isolated from Qatar. Numerous Bt strains exhibited strong antibacterial activity against both the foodborne pathogen B. ...

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; ... 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 ...

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; ... 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 ...

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. ...

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 ...

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; ... 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 ...

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 ...

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; ... 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 ...