https://dspace.univ-ouargla.dz/jspui/handle/123456789/27592 2026-04-10T18:27:18Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/31778 Titre: EFFET DES DIFFERENTS MODES DE SECHAGE SUR LE CONTENU PHENOLIQUE ET BIOLOGIQUE D’UNE PLANTE SPONTANEE A CARACTERE MEDICINALE DU SAHARA SEPTENTRIONAL ALGERIEN Auteur(s): MAHBOUB N; SLIMANI N; et KHELIL A Résumé: This study focuses on the contribution to the optimization of the effect of different drying methods (open air, oven, solar dryer and freeze-drying in comparison with the fresh plant) of a spontaneous plant with a medicinal character in the Sahara. Northern Algerian (Cymbopogon schoenanthus) on the content of secondary metabolites. The determination of the yield of phenolic compounds showed the richness of the dry crude extracts in all the drying modes carried out compared to the fresh sample. The best yields are obtained with freeze-dried and steamed samples (15.45% and 11.5%) respectively. The dosage of some secondary metabolites revealed the presence of 1.111 mg EAG/g DM in polyphenols in the taxa dried in the solar dryer and 0.031 mg EQ/g DM in flavonoids in the air-dried samples and 0.061 mg EAG/g DM in tannins in steamed samples. The DPPH test. revealed the strong antioxidant activity of Cymbopogon schoenanthus when freeze-dried or sun-dried, their EC50s are 0.222 mg/ml and 0.412 mg/ml, respectively. This anti-radical activity would be linked to the temperature of their desiccation not exceeding 45°C. Lyophilization and the solar dryer allow the preservation or even the increase of the antioxidant activity of the extracts tested, translated by the reduction of the EC50. According to the different results obtained, it can be concluded that freeze-drying and solar dryer seem the most preservative of phenolic compounds and of the antioxidant activity of all the extracts investigated. Description: Revue des BioRessources 2022-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/31779 Titre: STRUCTURE ET REGENERATION DE CHENE ZEEN (QUERCUS CANARIENSIS WILLD., 1809) DE LA FORET D’OULED BECHIH (SOUK AHRAS - ALGERIE) Auteur(s): TOUAFCHIA B; RACHED-KANOUNI M; KADI Z; REDJAIMIA L; ZERROUKI A; ABABSA L Résumé: The theme of our research is to describe the structural characteristics, the natural regeneration and the demographic structure of zeen oak in the Ouled Bechih forest (Souk Ahras). Data were collected by random sampling on 6 square plots of 0.09 ha. The dendrometric parameters measured were diameter at 1.3 m above ground level, total tree height and seedlings with diameter ≤ 10 cm. The diameter and height structures were fitted to the theoretical Weibull distribution using Minitab14 and XLStat 2022 software. The main results obtained indicate that mean height, mean diameter and basal area are significantly different in the 6 plots. The average density of Zeen oak trees in the Ouled Bechih forest is 157 trees/ha with a basal area of 22.65±5.53 m2/ha, the natural regeneration is average, it is 234.27%. The analysis of the diameter and height structures shows predominance of old trees with large diameters and high heights. These results constitute a database, which contributes to the improvement and sustainable management of the Zeen oak in this forest Description: Revue des BioRessources 2022-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/31785 Titre: L'OASIS ALGERIENNE : CONDAMNEE PAR LE PASSE MAIS PROJETEE SUR LE RENOUVEAU Auteur(s): SENOUSSI Abdelhakim Résumé: Algeria, a country with a hemmed-in desert where the oasis is a veritable constellation of unchanging green spots on a mineral immensity of sand and rock, representing a haven of life, born mainly from the conjunction of the sun, the genius of man, water and the date palm. Unfortunately condemned by a past that sequestered it in isolation, under the pretext of not being able to ensure its own reproducibility, the oasis has not been able to achieve its true lustre despite a very glorious history at all levels. A real island of social life (religious, cultural), of economic activity (agriculture, crafts, trade, small trades) and an ecologically functional system, whose cohesion is ensured by the complementarity of interests. At the dawn of the 2000s, a new era is taking shape for the Algerian oasis revealed by the launch of large-scale development operations. It is therefore legitimate to ask what meaning should be attributed to this spatial entity? It could be answered that it is through the implementation of an integrated multidimensional concept and a combination of sectors that the oasis should be considered as an agro-socio-economic-ecological system, exploited, managed and analysed in its entirety. Indeed, the establishment of a new spatial map respecting local potential is a guarantee of sustainability. Between the promotion of oasis products and the emergence of industries, archetypal Saharan terroirs are grafted on. It is from ecotourism and the processing industry that oasis development must be undertaken. In sum, from now on the key to good governance of the oasis will have to be based on the triangular of sustainability combining ecological viability, socio-economic profitability and technical-agronomic reliability. This is the added value that this synthesis attempts to elucidate. Description: Revue des BioRessources 2022-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/31775 Titre: CONTENU PHENOLIQUE ET ACTIVITÉS BIOLOGIQUES DES FEUILLES DE L’ÉSPÈCE Bunium mauritanicum Auteur(s): KAROUCHE S; BENBOTT A; HENOUDA S Résumé: Modern medicine uses many compounds derived from plants as an essential raw material in the pharmaceutical industry. Bunium mauritancum is one of the many plants which, throughout history, have had a reputation in the medical field. The main objective of this study was to evaluate bioactive substances, particularly polyphenols and flavonoids, as well as an evaluation of the antioxidant and anti-inflammatory activity of extracts from the leaves of this species. The sample was subjected to maceration in methanol, and the yield obtained from the aerial part is of the order of 3.1%. The quantitative analysis of total phenols and flavonoids revealed the presence of significant amounts respectively 123.80 ± 1.99 μg EAG / mg and 76.79 ± 9.039 μg EQ / mg of extract. Moreover, the methanoic extract of the leaves contains a strong reducing power and antioxidant capacities with respect to the DPPH radical with an IC50 of 19.36 mg / ml. The in vitro evaluation of the anti-inflammatory activity of extracts from the leaves showed a percentage inhibition of 40.11%. Our results demonstrate the remarkable potential of this plant as a valuable source of antioxidants exhibiting remarkable effects biologically Description: Revue des BioRessources 2022-06-30T00:00:00Z