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Antibacterial, antioxidant and acute toxicity tests on flavonoids extracted from some medicinal plants
Akroum Souad,Bendjeddou Dalila,Satta Dalila,Lalaoui Korrichi
International Journal of Green Pharmacy , 2010,
Abstract: Flavonoids are well-known for their many therapeutic and pharmaceutical effects. In this study, we tested the antibacterial activity of 11 flavonoids extracted from some medicinal plants by the agar diffusion method. Then, we measured their antioxidant activity using the DPPH (2,2′-diphenyl-1-picrylhydrazyl) radical assay and we also tested their acute toxicity effect on mice. The results showed that apigenin-7-O-glucoside was more active against the Gram-positive bacteria and quercetin was more active against the Gram-negative ones. Also, quercetin and diosmin showed the best antioxidant activity. Quercetin, apigenin-7-O-glucoside, luteolin-7-O-glucoside and luteolin-3′-O-glucuronide gave the best acute toxicity values. It can be concluded that quercetin was the most interesting compound for all the tested activities. Also, we observed that the presence or the absence of substitutions in flavonoids influenced significantly the results obtained, whereas the substitution type had a low impact.
Comparative study of the mechanical behavior of the superior thoracic artery and abdominal arteries using the finite elements method  [PDF]
Kadri Salim, Bouchelaghem Abdelaziz Mahmoud, Bendjeddou Walid
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.52008
Abstract: The human body has been the subject of thorough researches—not only from medical perspective but from a technical one as well—are very rich, amongst them we find blood circulation system comprising: the heart, the arteries and the veins. The overriding role of these researches is to explain some cardiovascular pathology and provide an aid tool for the endoprothesis positioning in blood vessels while treating them. In this study we have developed a digital pattern using the common (engineering technique of the) finite element method (FEM) to simulate the mechanical behavior of the thoracic aorta and the abdominal aorta below the kidney under blood pressure effect. This pattern calculates the displacements, the stresses (constraints) and the deformations of the two arteries’ walls enabling us to know their experimentally determined mechanical and geometric properties. This pattern could be applied to detect the aneurysm and dissection phenomena.
Thermomechanical Stress in the Evolution of Shear of Fiber-Matrix Interface Composite Material  [PDF]
Dalila Remaoun, Ahmed Boutaous
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.25051
Abstract: This work aims to describe the behavior of the interface using the method of load transfer between fiber and matrix in a composite material. Our contribution is to track the Evolution of the thermomechanical behavior by establishing a new mathematical model that describes the variation of shear stress along the interface. This model has been implemented in code in C++. The results revealed that the shear of the interface increases with temperature. This increase is partly due to the difference in expansion coefficient between fiber and matrix. The composite studied is T300/914; Carbon-Epoxy.
Cubic and quartic planar differential systems with exact algebraic limit cycles
Ahmed Bendjeddou,Rachid Cheurfa
Electronic Journal of Differential Equations , 2011,
Abstract: We construct cubic and quartic polynomial planar differential systems with exact limit cycles that are ovals of algebraic real curves of degree four. The result obtained for the cubic case generalizes a proposition of [9]. For the quartic case, we deduce for the first time a class of systems with four algebraic limit cycles and another for which nested configurations of limit cycles occur.
Recovery of Heavy Metal Using Solvent Impregnated Resin (SIR) Coupled with Donnan Dialysis  [PDF]
Dalila Berdous, Djamel Eddine Akretche
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.310103
Abstract: A membrane process for metal recovery from aqueous solutions was studied. Metal ions diffused from the feed compartment to the stripping compartment through an hybrid Donnan dialysis which consists to combine two ion exchange membranes with solvent impregnated resin (SIR). The aim of this work is to study the recovery of Pb(II), Ag(I) and Cu(II) from nitrate solutions by using SIR combined with classical Donnan dialysis. The resin has been prepared by impregnating the Amberlite XAD-4 using three different extractants namely: di-2-ethyl hexyl phosphine acide (D2EHPA), tris-octyl phosphine oxide (TOPO) and Diphenylthiourea (DPT). Experiments were performed as a function of nature of the extractant impregnated on the XAD-4 resin as well as the concentration in the resin phase, the stripping pH, the concentration ratio of metal ions in the feed compartment and the nature of the counter ions in strip compartment. The results show that the D2EHPA is the better extractant for the metal ions used in this work, and it’s shown a good selectivity for the separation between ions.
A missa e a fábrica: tentativas de controle dos espa?os das igrejas pelos bispos coloniais paulistas (1745-1796)
Zanon, Dalila;
História (S?o Paulo) , 2009, DOI: 10.1590/S0101-90742009000200005
Abstract: the pastoral letters of the colonial bishops and the registered chapters of pastoral visits in the bishop's tumble books, both located in the bishop's towns, tell us, among other subjects, about the implementation of tridentine decrees in the setecentista colony. such decrees, proceeding from the concil of trent and carried through by the catholic church in the 16th century, had to guide the performance of all the elements of the ecclesiastical hierarchy in the catholic kingdoms. the bishops were responsible for the implantation of the tridentines' devices, and for their execution. they were also responsible for demanding that all the scope of its jurisdiction was observed. when reading and analysing the pastoral visits in s?o paulo - between 1745 and 1796 - we find an episcopal orientation lined up with the tridentine decrees. in this article we will focus on two aspects of the administration of s?o paulo bishops: the ceremony of the mass and the administration of the church factories.
Images d’écrivaines chez Le la Sebbar : de l’auteure à ses personnages
Dalila Mekki
Synergies Algerie , 2012,
Abstract: Le la Sebbar revient dans plusieurs de ses textes situés dans l’Algérie de la période coloniale, sur des personnages féminins aux parcours singuliers. Leur marginalité rappelle les propos tenus par l’écrivaine, par ailleurs, sur l’exil, au féminin. Nous nous proposons d’interroger en particulier les images d’écrivaines suggérées, leurs jeux de correspondances, de l’auteure à ses héro nes, à partir de la nouvelle la fille dans l’arbre , publiée en 2003.
El psicólogo en el campo empresarial. Problemas y perspectivas
Dalila Platero
Revista Latinoamericana de Psicología , 1978,
Abstract:
Etnografía del aula: actores, objetos e instrucción Classroom ethnography: actors, objects and statements
Dalila Archila
Cultura Científica , 2011,
Abstract: El presente artículo, sintetiza los resultados del análisis del aula de preescolar, en la Institución Educativa San Pedro Claver del Municipio de Puerto Boyacá. A partir de interrogantes alrededor del aulacomo espacio físico y de los objetos que confluyen en ella, se planteó una reflexión crítica, desde la teoría de Popper, con el objetivo de entender el salón, como lugar de encuentro de los procesos deformación y su relación con los objetos y las estructuras dispuestas para la ense anza. Dentro de este esquema se empleó el método etnográfico para la obtención de categorías, las cuales derivaron en la clasificación de espacios y objetos según su uso y significado, lo que generó el concepto de aula infantil como escenario para el fomento de relaciones sociales, expresión de emociones y construcción desaberes. This article summarizes the results of analysis of the preschool classroom as a space for knowledge construction in San Pedro Claver educational institution in the municipality of Puerto Boyacá. From questions about the classroom as a physical space and objects that flow into it, is to make a critical analysis, from Popper's theory, in order to understand the classroom, meeting place and training processes their relationship with the objects and structures ready for teaching. Within this scheme is made use ofthe ethnographic method for obtaining categories, which resulted in the classification of spaces and objects according to their use and meaning as a result which led to the concept of children's classroom as a setting for the promotion of social, expression of emotions and knowledge building.
How do young people from so called “rough area” perceive the society where they are evolving?
Dalila Belgacem
Educa??o : Teoria e Prática , 2011,
Abstract: What young people see from the society they are evolving in gives us a clue about and an understanding of the reasons why they sometimes become violent. Young people are revolted because they feel like a lot of things are unfair; they miss “moral values” and “points of reference”, as if nothing made “sense” anymore. Then, consumersociety leads some young people into confusing reality with fictional fact and ultimately creates envy and jealousy. With the evolution of society and the fact that traditional rites “disappear”, young people are faced with the only rite that still exists to “jump” from childhood to grow-up world: school. But those who are not going to school will have to find and search for other “ rites of passage ” and we think that this is a major risk for young people, because this is where they could be “separated” from the society. Having to deal with this evolution, young people have some problems finding people they can identify themselves with.
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