https://dspace.univ-ouargla.dz/jspui/handle/123456789/3990 2026-04-23T09:54:02Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6635 Titre: CARACTÉRISATION PARTIELLE DES POLYSACCHARIDES HYDROSOLUBLES DES FEUILLES D'Asphodelus tenuifolius CAVAN (LILIACEAE): EFFET PRÉBIOTIQUE DES OLIGOSACCHARIDES ISSUS DE L'HYDROLYSE DES POLYSACCHARIDES Auteur(s): BOUAL Zakaria; MICHAUD Philippe; OULD EL HADJ Mohammed Didi Résumé: Asphodelus tenuifolius Cavan. (Liliaceae), a spontaneous plant used as a traditional medicine in Ghardaïa (Septentrional Sahara Algerian). This paper reports the extraction and partial characterization of watersoluble polysaccharides from A. tenuifolius leaves. These polysaccharides were obtained by elimination of the ethanol extract and sequential extraction in distilled water, followed by precipitation in 75% ethanol. The yield of extract is 0.65% (w/w). The crude water soluble polysaccharide extracts were further characterized and revealed the average values 18.33±2.08% moisture, 23.66±1.52% ash, 26.13±0.37% proteins and 28.96±1.12% carbohydrates, among them 32.49±0.26% are uronic acid and 67.50±0.94% are neutral monosaccharides.The acid hydrolysis 4M TFA at 80°C for 5 h is suggested to be more effective in releasing monomers. Thin layer chromatography (TLC) analysis of hydrolysat shows that the extract is constituted of heteropolysaccharides acid. The identification of monosaccharide composition by high performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD) method shows 39.25% of mannose, 31.55% of glucose, 10.92% of glucuronic acid, 8.9% of arabinose, 5.22% of rhamnose and 4.14% of xylose. The partial hydrolysate stimulate significantly for 0,1 DO after 24 hours, the multiplication of Klebsiella pneumonea pneumonea and prebiotic effect of the oligosaccharides from these hydrolysates on this are very likely. Description: Algerian Journal of Arid And Environment (AJAE) 2011-12-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6648 Titre: IMPACT DE LA GESTION DES EAUX SUR LE DÉVELOPPEMENT DES OASIS SAHARIENNES Auteur(s): SAKER Mohamed Lakhar; DADDI BOUHOUN Mustapha; OULD EL HADJ Mohamed Didi Résumé: The saharan oases have always played and still play an essential role in the socio-economic and ecological plans. They presente an interest for the development of the Saharan regions, notably through a rational and judicious use of water resources it needs. But despite these advantages, they remain confronttées several difficulties hindering their development, particularly the impact of water management. For this, it is necessary to implement a program of rehabilitation and development of these oases, through the implementation of concrete actions, allowing them to play their full role as part of agronomy Saharan Africa in particular and development of the saharan regions in general. Description: Algerian Journal of Arid And Environment (AJAE) 2011-12-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6644 Titre: ETUDE DE LA QUALITE PHYSICO-CHIMIQUE ET MYCOLOGIQUE DU BLE TENDRE LOCAL ET IMPORTE STOCKE AU NIVEAU DE L’OFFICE ALGÉRIEN INTERPROFESSIONNEL DES CÉRÉALES (OAIC) DE LA LOCALITE DE SAIDA (ALGERIE) Auteur(s): GACEM Mohamed Amine; OULD EL HADJ KHELIL Aminata; GACEMI Bouabdallah Résumé: The presence of fungal flora in cereals for human food can lead a serious consequences for his health. The development of this plant is among the leading causes of impaired health cereals. The quality control of the wheat during storage can reduce the loss of product caused by these fungi. It is a means of prevention and management of risks of contamination by fungi, some of which may be highly toxigenic. The study of the physicochemical and mycological quality samples of local and imported wheat stored at OAIC of Saida, showed that the rate of contamination of the imported variety is very high . The genus Aspergillus represented by different species was found in both varieties analyzed with a frequency and an abundance ranging from 41 to over 86% of the total flora identified on medium CDA and PDA. Genera Penicillium and Alternaria are uncommon. Finally, the genera Cladosporium, Fusarium and Ulocladium are less abundant in both wheat varieties analyzed. Description: Algerian Journal of Arid And Environment (AJAE) 2011-12-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6616 Titre: EVOLUTION SPATIO-TEMPORELLE DE LA PHYSICO-CHIMIE, MICROBIOLOGIE ET ÉCOTOXICOLOGIE DES LIXIVIATS DE LA DÉCHARGE PUBLIQUE D’EL-KERMA (ORAN, ALGÉRIE) Auteur(s): BENNAMA T; YOUNSI A; DERRICHE Z; DEBAB A Résumé: This work is part of the rehabilitation of landfills. Indeed, the dump of El Kerma (Oran, Algeria) is the central storage facility and disposal of solid waste (domestic, industrial, hospital and other) of the city of Oran. Huge quantities of waste discharged into the landfill, generate highly polluting leachate waters, rich in organic matter (average COD = 14,000 mg O2 / l), salt (mean EC = 130 mS / cm) and micro organisms. The physicochemical characterization of raw leachate generated by the landfill showed that these juices and stabilized discharge old, carrying a large pollution load (BOD5/COD = 0.052). The compositional analysis of heavy metals showed the significant metal loading of these effluents, in which iron is the most abundant metal (8 mg / l). The results of the bacteriological characterization indicated a very poor microbiological quality of the leachate. Indeed, rates of over 18,000 organisms per 100 ml of leachate were recorded for total coliforms and fecal streptococci, considered as tracers of the first rank of microbial pollution in the juice of landfills. Trials of acute ecotoxicity test Toxtracer made on these leachates showed a very high inhibition rate, exceeding 50% for dilutions greater than or equal to 0.5. This makes these effluents extremely toxic and thus presents a continuous danger to the health of local population and surrounding environment. Therefore, these wastes require a specific treatment prior to discharge into the receiving landfills. Description: Algerian Journal of Arid And Environment (AJAE) 2011-12-01T00:00:00Z