https://dspace.univ-ouargla.dz/jspui/handle/123456789/27375 2026-04-07T21:39:35Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27398 Titre: EVALUATION DE L’ACTIVITE ANTIOXYDANTE ET L’EFFET ANTIMICROBIEN DES COMPOSES PHENOLIQUES EXTRAITS DU LICHEN «Xanthoria parietina » DE LA REGION DE BOUMERDES Auteur(s): BOUCHENAK Ouahiba; BOUMAZA Sarah; YAHIAOUI Karima; BENHABYLES Narimen; LAOUFI Razika; TOUBAL Souheyla; KHIARI Ouiza; BLIZAK Djanette; ARAB Karim Résumé: Lichens are symbiotic organisms with different biological activities due to their various secondary metabolites. The objective of this work is to identify and characterize the lichen Xanthoria parietina harvested from two sites, forest and agglomeration of the Wilaya of Boumerdes, as well as the evaluation of the antioxidant and antimicrobial activity of its methanolic and acetonic extracts. Phytochemical characterization indicates the presence of parietin and barbatic acid. The highest extraction yield is that of extracts from the agglomeration site whose values for methanolic and acetonic extract are respectively 43% and 34% unlike extracts from forest lichens whose yield is around by 12% and 11%. The determination of total ployphenols reveals a high content for the extract of forest lichens. The values are 0.139 mgEAG / g and 0.126 mgEAG / g respectively for the methanolic and acetonic extract whereas, the extract of agglomeration lichens has values of 0.087 mgEAG / g and 0.044 mgEAG / g. The evaluation of the antioxidant activity of the lichenic extract from the agglomeration site revealed a greater value for the methanolic extract (2.06 mgEAA / g) than that of acetone (1.38 mgEAA / g). The evaluation of antimicrobial activity highlighted the sensitivity of 4 bacterial strains (Bacillus sp, A.boumannii, E.faecalis and E.cloacea) and 5 fungal strains (A.fumigatus, A.flavus, yeast of Malassezia, T.glabrum, C. parapsilosis) with acetonic and methanolic extracts from the two sites studied. It emerges from this study that the methanolic and acetonic extracts of the lichen Xanthoria parietina have a greater spectrum of action on fungi than bacteria. Description: Revue des bioressources 2020-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27396 Titre: L’OASIS DE OUARGLA (SUD EST ALGERIEN) ENTRE DECLIN ET PROGRAMMES D’ETAT DE REHABILITATION Auteur(s): Salah ZENKHRI; Mokhtar KARABI Résumé: This study deals with the oasis of Ouargla, considered to be one of the main oases of the Algerian Sahara. This oasis is now in decline under the effects of its land fragmentation, the crumbling of its plots, urbanization, incineration of its palm groves and climate change that threaten with disappearance this oasis, grudged from aridity and desert at the cost of self-sacrifice. Our results indicate that the oasis of Ouargla underwent a phase of progression followed by a period of stagnation and regression. State development programs and local restoration initiatives have again triggered a revival and reversal towards oasis agricultural activity in recent years. Description: Revue des bioressources 2020-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27395 Titre: EFFETS DES PRATIQUES AGRICOLES SUR LA BIODIVERSITE DES ORTHOPTERES DANS L’OASIS DE GHARDAÏA Auteur(s): ZERGOUN Y; GUEZOUL O; SEKOUR M; BOURAS N; HOLTZ M Résumé: After three years of monitoring (2016-2019), no less than 6256 individuals of Orthoptera were counted on 3 palm groves in Ghardaïa. These specimens are represented by 22 species belonging to 4 families. The presence of a herbaceous layer such as Cynodon dactylon and Setaria verticillata promotes the development of Gomphocerinae such as Ochrilidia gracilis. In contrast, the presence of a high proportion of date palms and fruit trees contributes to the decrease in the locust fauna. The density of locusts begins to increase in Spring (26 individuals/100 m2) to reach the maximum in Summer (58 individuals/100 m2). The highest densities are noted in the least maintained palm groves. In general, the values of the Shannon diversity index (H’) (1.84-2.63 bits) and the inverse of the Simpson index (4-12) gradually change in Spring and Summer where it is maximum, then decreases in Winter. alpha diversity is high in poorly maintained palm groves (2.62). This study indicated that the Orthoptera could be successfully used as bio indicators of oasis disturbance Description: Revue des bio ressources 2020-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27394 Titre: SUSTAINABILITY OF PALM DATE’S FARMS AT OUARGLA; ANALYSIS OF SOME SOCIOCULTURAL CRITERIAS Auteur(s): DJELFAOUI Zineb; CHAOUCH Saida Résumé: The rehabilitation and preservation of Palm dates trees heritage are strategicaly important, thus on the agro-ecological, economical and social level.They respond perfectly to all palm dates trees farmers concerns that the Government has supported ; through several programs for many decades including Local Initiatives Projects (LIP). In order to grasp the socio-cultural sustainability of palm dates farms, surveys were carried out on a sample of 16% of farmers joining the LIP through the oases of Ouargla; especialy Ouargla, N’goussa, Zaouia labidia and Elhajira targeting criterias about farmers : thier age ; educational level ; descendants future activity and types of the agricultural workforce. The results show that the farmers are mainly elderly or adults (86.9%), they are 60% illiterate but strongly attached to their oases while their descendants move towards other more gainful sectors.In the other hand, 64% of PILs are carried out by companies and design offices managed by young people, which can claim a certain reintegration of young people into oasis activity.Entrepreneurship can create a training effect for young farmers to might be interested in oases activities.Regarding, the workforce, one of the most relevant indicators of socio-cultural sustainability, is for its half (52%) family type with a fairly good upgrading of seasonal workforce (41%).The results agregation of the criteria developed in this study indicates a trend towards the possibility of improving the socio-cultural situation. Thus, the sustainability of palm dates farms in Ouargla Description: Revue des bio ressources 2020-06-30T00:00:00Z