https://dspace.univ-ouargla.dz/jspui/handle/123456789/3984 2026-04-07T11:59:39Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6491 Titre: STEREOCHEMICAL ANALYSIS IN 22-MEMBERED MACROLIDES BASED ON MOLECULAR MODELING. Auteur(s): S. BELAIDI; A. DIBI; M. OMARI; T. LANEZ Résumé: Conformational analysis of macrolides with 22-ring membered has been carried out using molecular modeling (molecular mechanics and molecular dynamics). The results indicate that each investigated macrocycles present eight types of preferential conformations. They result of the combination of two systems diene and ester a,b-unsaturated. A high conformational mobility of no complexed macrocycles (22) was obtained. In presence of tricarbonyliron, the number of the privileged conformations was reduced. Description: AST Annales des Sciences et Technologie 2006-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6499 Titre: Synthèse et identification de quelques dérivés de N-1-phenyl N-2-aryl imidazoline-2-thione Auteur(s): r. benzahi; b. dadamoussa; a. cheriti Résumé: The nitrogenized heterocycles occupy an important place in the organic chemistry, in particular imidazols by what they exists in many natural products and certain drugs. Sight this importance; four derived from imidazol were synthesized. In order to lead to these products, we chose a synthetic way of four stages. The structures of these products were confirmed by spectroscopy (IR, UV, RMN1H) Description: AST Annales des Sciences et Technologie 2006-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6520 Titre: UTILISATION DES LICHENS COMME BIO-INDICATEURS DE LA POLLUTION ATMOSPHERIQUE DANS LA REGION DE HASSI MESSAOUD Auteur(s): KHELIL Rahma; ALIOUA Amel Résumé: Nowadays, the biosphere is suffering with various aggressions of the human activities, which increase its fragility and discupt it's functioning and disrupt its functioning. So, it should be protected to prevent any irreversible effect.Our study was carried out in 2003 to evaluate the atmospheric pollution by hydrocarbons in Hassi Messaoud region as a petroleum area surrounded by many torches.To determine the spatiotemporal accumulation rate of hydrocarbons in different places of the studied area, some lichen transplants of Xanthoria parientina were used as bioaccumulators.It was resulted in a regular accumulation of hydrocarbons in the lichen transplants during the whole length of exposure.Besides, it was found a significant correlation between the accumulation of hydrocarbons, length of exposure and space factor. This concordance between the hydrocarbons accumulation and the two precedent factors lets to suppose that Xanthoria parientina can be suitable species to evaluate atmospheric pollution in such cases. Description: AST Annales des Sciences et Technologie 2006-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6505 Titre: ADSORPTION DES COLORANTS TEXTILES PAR UNE ARGILE MODIFIEE Auteur(s): Ahmed BOULMOKH; Yamina BERREDJEM; Nadia BENSID; Kamel GUERFI; Abdelhak GHEID Résumé: In this work we proceeded to the determination of the structural and physico - chemical features of clay in order to study his behavior screw to screw of certain textile stains of synthesis. We prepared different samples cationics (Na+, Al+3, Fe+3) and another treaty by H2O2. The bruise of methylene acted as model. Isotherms of adsorption have been studied according to several physico-chemical parameters: pH, granulometry, temperature and speed of agitation. Parameters of the adsorption balance gotten according to the equation of Langmuir have been determined. The experimental results show that the clay treated by H2O2 and NaOH presents features of adsorption favorable to the elimination of this synthesis stains textile. Description: AST Annales des Sciences et Technologie 2006-01-01T00:00:00Z