University dOran1 Ahmed Ben Bella
University dOran1 Ahmed Ben Bella
Mokhtar A.,University Doran1 Ahmed Ben Bella |
Djelad A.,University Doran1 Ahmed Ben Bella |
Boudia A.,University Doran1 Ahmed Ben Bella |
Sassi M.,University Doran1 Ahmed Ben Bella |
Bengueddach A.,University Doran1 Ahmed Ben Bella
Journal of Porous Materials | Year: 2017
The purpose of this work is the synthesis of two series of layered silicate materials with different ratios (10, 30, 50, 80 and 100) of Cu(NO3)2, or Zn(NO3)2 by ion-exchange method. Several analysis techniques have been used such as X-ray diffraction, energy dispersive X-ray spectroscopy, thermogravimetric analysis, scanning electron microscope and Fourier transform infrared spectroscopy. The results revealed that ion-exchange method of copper and zinc with different ratios did not affect the structure of Na-magadiite. The gap between the theoretical and experimental ion-exchange are in agreement. Antibacterial activity test against Escherichia coli, Rhizobium sp. and Staphylococcus demonstrate that when ratio was (30, 50, 80 and 100) the antibacterial activity of the layered silicate materials showed high antibacterial activity. © 2017 Springer Science+Business Media New York
Bouchiba Z.,University Doran1 Ahmed Ben Bella |
Boukhatem Z.F.,University Doran1 Ahmed Ben Bella |
Ighilhariz Z.,University Doran1 Ahmed Ben Bella |
Derkaoui N.,University Doran1 Ahmed Ben Bella |
And 4 more authors.
Canadian Journal of Microbiology | Year: 2017
A total of 51 bacterial strains were isolated from root nodules of Scorpiurus muricatus sampled from 6 regions of western Algeria. Strain diversity was assessed by rep-PCR amplification fingerprinting, which grouped the isolates into 28 different clusters. Partial nucleotide sequencing of the 16S rRNA gene and BLAST analysis revealed that root nodules of S. muricatus were colonized by different species close to Rhizobium vignae, Rhizobium radiobacter, Rhizobium leguminosarum, Phyllobacterium ifriqiyense, Phyllobacterium endophyticum, Starkeya sp., and Pseudomonas sp. However, none of these strains was able to form nodules on its host plant; even nodC was present in a single strain (SMT8a). The inoculation test showed a great improvement in the growth of inoculated plants compared with noninoculated control plants. A significant amount of indole acetic acid was produced by some strains, but only 2 strains could solubilize phosphate. In this report we described for the first time the diversity of bacteria isolated from root nodules of S. muricatus growing in different regions in western Algeria and demonstrated their potential use in promoting plant growth. © 2017, Published by NRC Research Press.
Argoub A.,University Doran1 Ahmed Ben Bella |
Ghezini R.,University Doran1 Ahmed Ben Bella |
Bachir C.,University Doran1 Ahmed Ben Bella |
Bachir C.,Laboratoire Of Chimie Appliquee Lac |
And 6 more authors.
Journal of Porous Materials | Year: 2017
MIL-101@g-C3N4 nanocomposite was prepared by solvothermal synthesis and used for CO2 adsorption. The parent materials (MIL-101 and g-C3N4) and the MIL-101@g-C3N4 were characterized by X-ray diffraction, argon adsorption/desorption, Fourier transform infrared spectroscopy, thermal analysis (TG/DTA), transmission electronic microscopy, and Energy-dispersive X-ray spectroscopy. The results confirmed the formation of well-defined MIL-101@g-C3N4 with interesting surface area and pore volume. Furthermore, both MIL-101 and MIL-101@g-C3N4 were accomplished in carbon dioxide capture at different temperatures (280, 288, 273 and 298 K) at lower pressure. The adsorption isotherms show that the nanocomposite has a good CO2 adsorption affinity compared to MIL-101. The best adsorption capacity is about 1.6 mmol g−1 obtained for the nanocomposite material which is two times higher than that of MIL-101, indicating strong interactions between CO2 and MIL-101@g-C3N4. This difference in efficacy is mainly due to the presence of the amine groups dispersed in the nanocomposite. Finally, we have developed a simple route for the preparation of an effective and new adsorbent for the removal of CO2, which can be used as an excellent candidate for gas storage, catalysis, and adsorption. © 2017 Springer Science+Business Media New York
Aicha B.,University Doran1 << Ahmed Ben Bella >> |
Mohamed S.,University Doran1 << Ahmed Ben Bella >> |
Jocelyne M.-B.,CNRS Mulhouse Institute of Materials Science |
Benedicte L.,CNRS Mulhouse Institute of Materials Science |
And 2 more authors.
Journal of Porous Materials | Year: 2017
In recent years, layered silicates have extensively been used to design new nanomaterials through functionalization. In this work, the lamellar sodium silicates magadiite and kenyaite have been hydrothermally synthesized in presence of ethanol as organic co-solvent. Materials of high purity and high crystallinity were obtained after only 24 h of crystallization at a temperature of 180 °C for kenyaite and a temperature of 150 °C for magadiite. It appears that the presence of ethanol in the synthesis medium tends not only to increase the crystallization rate, but also to stabilize the formation of magadiite.The as-synthesized Na-kenyaite was used as precursor for the preparation of titanium pillared clay materials. The resulting microporous titanium oxide pillared kenyaite materials exhibit large specific surface areas up to 180 m2 g−1 with a Ti contents up to 24 wt% and are active for the photocatalytic degradation under UV light irradiation of the organic dye methyl orange in water. © 2017 Springer Science+Business Media, LLC
Hadj Mokhtar H.,University of Oran 1 |
Boukoussa B.,University dOran1 Ahmed Ben Bella |
Boukoussa B.,Center University Ain Temouchent |
Hamacha R.,University dOran1 Ahmed Ben Bella |
And 2 more authors.
RSC Advances | Year: 2015
This paper focuses on the use of natural sources for the preparation of efficient and low cost catalysts. CaCO3 is obtained from cuttlefish bone and was modified by the cation exchange of Ca2+ by Cu2+ in CaCO3 using solutions of copper (Cu(NO3)2) at different concentrations. The modification of the solids was investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and ultraviolet-visible (UV-vis) spectroscopy. The results show that the copper exchanged materials contain a CuCO3-CuO nanoparticle composite. The obtained solids were used as catalysts for the cycloaddition reaction of different azides with activated alkenes at room temperature under liquid phase conditions. The different parameters which affect the reaction were investigated such as reaction time, temperature of the reaction, effect of the copper content, catalyst mass, effect of the solvent and nature of the azide. High yields were obtained when the catalyst contained more copper. The best catalysts were calcined at different temperatures (200, 300, 400, 500 °C) in order to determine whether the active phase was CuCO3 or CuO in the catalytic reaction. The XRD analysis of the calcined composites shows that an increase in calcination temperature leads to the formation of the CuO phase. On the other hand, the use of these calcined materials as catalysts shows that the active phase is copper carbonate. Finally, a new method for preparing triazoles with short reaction times was developed by the use of a cheap environmentally friendly catalyst. © 2015 The Royal Society of Chemistry.
Bessadat N.,University Doran1 Ahmed Ben Bella |
Hamon B.,University of Angers |
Henni D.E.,University Doran1 Ahmed Ben Bella |
Simoneau P.,University of Angers
Plant Disease | Year: 2016
Tomatoes (Solanum lycopersicum) are widely cultivated in Algeria throughout the year. In northwestern growing areas, characterized by temperate humid climates, severe early blight symptoms (i.e., black lesions surrounded by a yellow halo) on tomato leaves are regularly observed. In 2013, diseased samples were collected from various cultivars in five farms of the Mostaganem region where average disease incidence reached 50%. Plant material was cut into ∼2-mm pieces, surface sterilized in 0.1% (v/v) Na hypochlorite for 2 min, transferred into potato agar medium, and incubated for 48 h at 25°C. Fungal mycelium developing from the lesion margins was transferred to potato carrot agar medium and further incubated for 7 days alternating darkness and cool-white fluorescent light to induce sporulation. Both small- and large-spored Alternaria isolates were obtained. While most of the large-spored isolates had morphological characteristics of A. linariae (syn. A. tomatophila) (Woudenberg et al. 2014), large-spored isolates from one location (Mamache) produced ovoid conidia whose length and width were 149.8 ± 8.9 µm and 16.4 ± 1.3 µm, respectively, ended by a single beak measuring up to 120 µm. Based on these morphological characteristics and host origin, these isolates were initially described as A. solani (Simmons 2000). To confirm the identification at the species level, DNA was extracted from mycelium of four representative isolates. As polymorphism in the ITS regions of rDNA is too low to delineate species within the Alternaria section Porri (Woudenberg et al. 2014), partial regions of the glyceraldehyde-3-phosphate dehydrogenase (gpd) and of the calmodulin (cal) genes were amplified using published primer sets (Gannibal et al. 2014; Woudenberg et al. 2014). For two isolates (NB250 and NB252), the sequences of the amplified products (GenBank Accession Nos. KR911747, KR911752 KR911765, and KR911767) were 100% identical to corresponding sequences of A. solani isolate CBS 109157 (GQ180080 and KJ397981). The gpd and cal sequences of the remaining isolates (NB248 and NB249, GenBank Accession Nos. KR911748, KR911754, KR911763, and KR911764) shared 100% sequence homology to A. grandis isolate CBS109158 (JQ646341 and JQ646249) and they were therefore assigned to this species. To confirm pathogenicity on tomato, the four isolates were spray inoculated (104 conidia/ml) on leaves of 3-week-old tomato plants (cv. Saint Pierre) in the greenhouse. Three replicates were performed for each test. Plants were rated for disease symptoms up to 21 days post inoculation (dpi). No symptom was observed on control plants treated with distilled water. All plants inoculated with A. solani and A. grandis isolates produced extending lesions on leaves albeit with variable virulence (affected leaf area from 50 to 80% at 21 dpi for NB249 and NB250, respectively). To our knowledge, this is the first report of A. grandis infecting tomato in Algeria and in Africa. Moreover, A. grandis has been reported on potato crops in North and South America (Simmons 2000; Rodrigues et al. 2010), but never on tomato. The fact that potato and tomato fields often coexist in close proximity in northwestern Algeria even with farmers using potato in rotation with tomato may favor the development of A. grandis on the latter plant species. © 2016 The American Phytopathological Society.
Bendeddouche C.K.,University dOran1 Ahmed Ben Bella |
Adjdir M.,University dOran1 Ahmed Ben Bella |
Adjdir M.,Institute of Functional Interfaces |
Benhaoua H.,University dOran1 Ahmed Ben Bella
Letters in Organic Chemistry | Year: 2016
Background: The cyclopropanation reaction was inspected by addition of carbene generated from ethyl diazoacetate in the presence of a greener Cu-exchanged bentonite catalyst to olefin under solvent free condition. The cyclopropanes were obtained with good yields. Our own contribution in this area was to introduce a modified Algerian bentonite as a catalyst and microwave activation as a mode of heating. Methods: A catalytic material developed from natural type montmorillonite clays, from deposits of Maghnia (Western Algeria), by cation exchange (Cu2+) was characterized by different spectral methods. The catalytic properties of the new material were explored in cyclopropanation reaction of olefins under microwave irradiation. A comparative study with Cu-exchanged bentonite as catalyst between microwave activation and classical heating was conducted. Results: Cu2+ exchanged clay is an efficient catalyst in the generation of carbenes from diazocompounds, under microwave irradiation. The formation of carboxylate cyclopropane was performed in solvent free condition with moderate diastereoselectivity. The yields were good, and the catalyst can be reused at least three times without noticeable loss of catalytic activity. Conclusion: This work shows that the coupling "modified clay/microwave activation" is a clean and simple access to functionalized cyclopropanes. This reusable Cu exchanged clay material is shown to be as a good substitute for many sophisticated and hardly accessible catalysts. © 2016 Bentham Science Publishers.
Abdelouhab F.Z.,University Doran1 Ahmed Ben Bella |
Atmani B.,University Doran1 Ahmed Ben Bella
Journal of Decision Systems | Year: 2016
Les ontologies deviennent, de plus en plus, des modèles de représentation et de stockage d'informations très efficaces facilitant le traitement et la gestion des connaissances à travers les techniques de l’intelligence artificielle et offrant le potentiel d'assemblage d'une grande quantité d'informations à travers ce qu'on appelle «la fusion d'ontologies». Cette dernière se voit de plus en plus importante et fréquente dans les recherches actuelles vu l’apport qu’elle offre à construire, à moindre coût, des ontologies génériques à partir des ontologies partielles et à les adapter aux nouvelles exigences des besoins évolutifs des connaissances. Cependant, elle définit l’interprétation d’un véritable réseau de connaissances dont la complexité se heurte à une explosion du nombre et de la taille des ontologies à fusionner. D’un autre coté les automates cellulaires sont un modèle particulier de systèmes dynamiques discrets remarquables par leurs simplicités et leurs capacités à produire des comportements d’une grande richesse. La contribution adressée dans ce papier est de concevoir une nouvelle approche de fusion booléenne des ontologies en utilisant la machine cellulaire CASI (Cellular Automata for Symbolic Induction) permettant d’optimiser la complexité des algorithmes de fusion classiques par des fonctions simples de transitions locales synchrones. © 2016 Informa UK Limited, trading as Taylor & Francis Group
Bensenane B.,CNRS Hubert Curien Multi-disciplinary Institute |
Bensenane B.,University dOran1 Ahmed Ben Bella |
Asfari Z.,CNRS Hubert Curien Multi-disciplinary Institute |
Platas-Iglesias C.,University of La Coruña |
And 4 more authors.
Dalton Transactions | Year: 2016
The syntheses of two new ligands based on a calixarene scaffold in the cone conformation functionalized on the phenolic positions 1 and 3 by diethylthiophosphonates (L1) or tetra(tri)thioethyleneglycol (L2) crowns are described. Together with ligand L3, the parent calixarene substituted by a penta(tetra)thioethyleneglycol crown, the spectroscopic properties of the ligands were determined by means of UV-Vis absorption spectroscopy and steady-state and time-resolved fluorescence spectroscopy, showing that the ligands display modest but non-negligible intrinsic fluorescence properties (πfluo = 0.023; 0.026 and 0.029 for L1, L2 and L3 in CH2Cl2, respectively). The X-ray crystal structures of ligand L1, and of its synthetic precursor were determined and analyzed for their capacity to accommodate the incoming cationic species. The ligands were further investigated for their complexation properties of divalent cations such as Cu2+, Zn2+, Hg2+ and Cd2+ (under their nitrate salts) in 1:1 CH3CN/CH2Cl2 solutions (I = 0.01 M Et4NNO3, T = 25.0(2) °C), in which the additions of cations were monitored by absorption and steady-state fluorescence spectrophotometries. The stoichiometries of the corresponding complexes were assessed by ESI-MS, while insights into the structures of the complexes in solution were obtained with density functional theory (DFT) calculations. The influence of the sulphur and phenol coordinating moieties was addressed to show that the thiocrown compounds L2 and L3 displayed a marked affinity towards the soft mercuric cation (Δlog K ≥ 2), with no particular size selectivity effect, whereas ligand L1 can accommodate both the thio and phenol units to coordinate with Cu(ii). Altogether, these results point to the use of L3 as a selective fluoroionophore for detection of Hg2+. © 2016 The Royal Society of Chemistry.