http://dspace.centre-univ-mila.dz/jspui/handle/123456789/10 2026-04-03T02:41:37Z 2026-04-03T02:41:37Z Douaa, LEBCIR,KAOUACHEHayat http://dspace.centre-univ-mila.dz/jspui/handle/123456789/4419 2025-09-15T10:22:15Z 2025-06-01T00:00:00Z

Titre: Étude phytochimique et évaluation de l'activité antibactérienne de deux plantes médicinales Auteur(s): Douaa, LEBCIR,KAOUACHEHayat Résumé: Medicinal plants are a valuable and diverse natural resource, rich in secondary metabolites with a wide array of applications in pharmaceutical, medical, agronomic, food, and biotechnological industries. These compounds are also responsible for various biological activities, particularly antibacterial effects. Therefore, our study focused on two well-known medicinal plants: Artemisia herba-alba (family Asteraceae) and Thymus vulgaris L. (family Lamiaceae), both recognized for their therapeutic properties. Our work aimed to conduct a qualitative analysis of the phytochemical compounds present in Artemisia herba-alba and Thymus vulgaris L., in addition to a quantitative assessment of total polyphenols. We also evaluated the antibacterial activity of their respective extracts. The results revealed the presence of various groups of secondary metabolites in both plants, highlighting their therapeutic potential. The total polyphenol content was found to be 3.31 mg GAE/g in the ethanolic extract of Artemisia herba-alba, and 3.70 mg GAE/g in the methanolic extract of Thymus vulgaris L. This variation might be due to differences in extraction methods, the type of solvent used, or the intrinsic characteristics of each plant. The antibacterial activity was tested against four bacterial strains: Escherichia coli, Staphylococcus aureus, Bacillus subtilis, and Pseudomonas aeruginosa using the disc diffusion method on agar medium. The ethanolic extract of Artemisia herba-alba showed notable activity against Bacillus subtilis, with an inhibition zone of 13.68 mm but without efficacy against the other tested bacterial strains. The methanolic extract of Thymus vulgaris L. exhibited significant activity against Pseudomonas aeruginosa (10.87 mm). In conclusion, this study demonstrates that both Artemisia herba-alba and Thymus vulgaris L. possess antibacterial properties and contain substantial amounts of polyphenols, suggesting their therapeutic potential in treating various infections.

2025-06-01T00:00:00Z Rayhana, BEKHOUCHE http://dspace.centre-univ-mila.dz/jspui/handle/123456789/4418 2025-09-15T10:10:37Z 2025-06-01T00:00:00Z

Titre: The effect of urban pollution on land snail biodiversity in the Mila region (Oued Athmania case) Auteur(s): Rayhana, BEKHOUCHE Résumé: This study evaluates the impact of urban pollution on terrestrial snails biodiversity in the commune of Oued Athmania (wilaya de Mila). Through field observations, physico-chemical soil analyses and ecological tools, 10 species belonging to 5 families were identified at 6 stations. Dominant species, such as Xerosecta sp. (49%) and Rumina decollata (13%), show a high tolerance to disturbance, unlike other more sensitive species. Malacological diversity is higher in stations with neutral, wet and low-salt soils, and decreases in degraded areas. Terrestrial snails are excellent bioindicators of soil quality. The study highlights the significant impact of urban pollution on this wildlife and advocates better integration of terrestrial invertebrates into conservation and environmental management policies. It is also a useful basis for future research in ecology and sustainable soil management.

2025-06-01T00:00:00Z IBRAHIM EL KHALIL, BOURAOUI http://dspace.centre-univ-mila.dz/jspui/handle/123456789/4417 2025-09-15T10:07:48Z 2025-06-01T00:00:00Z

Titre: Production de Bioplastique Auteur(s): IBRAHIM EL KHALIL, BOURAOUI Résumé: Global fossil plastic production raises major environmental concerns and drives the development of bioplastics from renewable resources and agro-food waste1. This study targets extracting starch from unsold white bread waste and household potato peels, then formulating bioplastic films optimized for flexibility, mechanical strength, and biodegradability. Two extraction protocols were compared: • Dry bread: simple sieving-decantation. • Potato peels: grinding-decantation with alkaline adjustment1. Extracted starches (~13% yield) underwent five sequential formulations (series A–E) incorporating glycerol, NaOH, HCl, gelatin, and nanoclay1. Each formulation was cast into films, dried, then characterized thermally (water loss at 45 °C), physicochemically (water absorption, solubility), and for biodegradability in home compost over 56 days. • Yields and purity: ~65 g starch per 500 g bread (≈85% purity) and ~106 g per 782 g potato flesh (≈92% purity). • Optimal formulation: film E3 (0.7 g nanoclay) showed +35% tensile strength, +45% Young’s modulus, and 35% reduction in water vapor permeability versus reference film. • Thermal stability: film C3 (3 mL HCl) had the lowest mass loss (0.8%) after 10 min at 45 °C1. • Biodegradability: progressive mass loss of nearly 40% by day 56 in home compost, confirming film degradability. Bread and potato waste are viable, cost-effective starch sources for high-performance bioplastics1. Alkaline and acid modifications combined with nanostructured fillers achieve an optimal balance of flexibility, mechanical strength, and moisture barrier. Notable home compost biodegradability highlights environmental benefits. The study outlines an effective valorization pathway for agro-food waste into starch-based bioplastic films1. Developed extraction and formulation protocols yield films with enhanced mechanical and 107 barrier properties while retaining significant biodegradability. Industrial-scale integration into domestic biorefineries could reduce fossil plastic reliance and food waste. Future work should optimize large-scale yields and conduct full life cycle assessments to confirm environmental advantages of this circular approach.

2025-06-01T00:00:00Z Khadidja, KERBACHE http://dspace.centre-univ-mila.dz/jspui/handle/123456789/4416 2025-09-15T10:04:50Z 2025-06-01T00:00:00Z

Titre: Diversité et structure de la myrmécofaune dans la région de Grarem Gouga (Wilaya de Mila). Auteur(s): Khadidja, KERBACHE Résumé: Our study aims to assess the diversity and structure of ant communities (Formicidae) in the district of Grarem Gouga (Mila Province, Algeria). Between February and April 2025, surveys were conducted in two contrasting habitats: an olive grove and an uncultivated plot. A total of 19 species belonging to 11 genera and 3 subfamilies (Myrmicinae, Formicinae, Dolichoderinae) were recorded. The Dolichoderinae subfamily dominated in terms of abundance, while the Myrmicinae, particularly the genus Messor, stood out for their species richness. The analysis revealed high biodiversity and a relatively balanced distribution of species, slightly more pronounced in the olive grove. The composition of communities differed significantly between the two sites, reflecting the influence of local ecological conditions. These findings highlight the value of ants as bioindicators and underline the need for further research on the regional myrmecofauna to effectively guide biodiversity conservation strategies in the Mila region.

2025-06-01T00:00:00Z