OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Akroum Souad” ,找到相关结果约86条。
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.
Note on the Linearity of Bayesian Estimates in the Dependent Case  [PDF]
Souad Assoudou, Belkheir Essebbar
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.51006

This work deals with the relationship between the Bayesian and the maximum likelihood estimators in case of dependent observations. In case of Markov chains, we show that the Bayesian estimator of the transition probabilities is a linear function of the maximum likelihood estimator (MLE).

Phonétisme et Ludisme dans l’acte d’auto-apprentissage
Benali Souad
Synergies Algerie , 2007,
Abstract: Il est très important d’enseigner et d’apprendre la prononciation dans les classes de langues secondes et surtout étrangères. Cette modeste ré exion propose à partir d’une ré exion sur la pertinence de la phonétique (prosodie et phonématique) dans l’apprentissage d’une langue d’appréhender la place et les formes de cet enseignement- apprentissage et de ce qu’il est convenu d’appeler la correction phonétique à partir d’activités et de jeux de prononciation (ludisme), aussi d’étudier et d’élaborer des activités et des exercices permettant de mener à bien ces objectifs.
Disney animation: Global diffusion and local appropriation of culture
Souad Belkhyr
International Journal of Human Sciences , 2012,
Abstract: Children’s media products reflect the cultural values of their producers and the social, political and economic conditions under which they were produced. Watching an animated cartoon, therefore, cannot be regarded as an innocent and simple act of consumption. It rather involves a complex process of coding/decoding and appropriating cultural meanings. Disney films are not only global means of entertainment but they can also function as an ideological apparatus. In an era of globalisation where the boundaries and divisions between entertainment and materiel consumption are blurred, Arab audiences are faced with a one-way flow of seemingly alien ideas and values that are disseminated through Disney stories, images and narratives. The relation between structured patterns of communication under globalization, on one hand, and the local conditions under which Disney cartoon products are marketed and consumed in the Arab world, on the other, can be understood as the main axis of globalised diffusion and localised appropriation of American cultural values and lifestyle among Arab societies
Du cri à l’écrit … l’écriture une stratégie de dépassement de soi: le cas d’Amélie Nothomb
Benali Souad
[email protected]@ , 2010,
Abstract: Née au japon, Amélie Nothomb y passe les cinq premières années de sa vie, dont elle restera profondément marquée linguistiquement et culturellement. (...) De sa vie à Bruxelles, et de son cursus universitaire, elle ne cache nullement ses douloureux souvenirs d’être incompris et rejeté, se retrouvant toujours confronté à une mentalité qui lui était inconnue. Toute cette civilisation occidentale à laquelle elle est censée appartenir, et l’orientale, berceau de son enfance et abreuvoir de son adolescence. Ce fut la collision des deux civilisations diamétralement opposées; elle dira à propos de ce choc socioculturel et civilisationnel.
Antioxidant and Antibacterial Properties of Mesembryanthemum crystallinum and Carpobrotus edulis Extracts  [PDF]
Bouftira Ibtissem, Chedly Abdelly, Souad Sfar
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.23042
Abstract: The two halophyte plants Mesembryanthemum crystallinum and Carpobrotus edulis (Family: Aizoaceae, Order: Cary-ophyllales), widely used in the traditional medicine, were chosen for this study. There is no much information about the antioxidant and antibacterial activities of the two plants growing in the Tunisian coasts. The most of studies conducted confirmed the responses of these plants to the abiotic stresses. We demonstrate a high antioxidant activity in the two plant extracts by using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The two plant extract also exhibited antibacterial activity by using the minimal inhibitory concentration (MIC) against bacterial strains; Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853) and Staphylococcus aureus (ATCC 25923). The different medicinal properties can be attributed in part to the presence of polyphenolics compounds in the two plant extracts.
About Multichannel Speech Signal Extraction and Separation Techniques  [PDF]
Adel Hidri, Souad Meddeb, Hamid Amiri
Journal of Signal and Information Processing (JSIP) , 2012, DOI: 10.4236/jsip.2012.32032
Abstract: The extraction of a desired speech signal from a noisy environment has become a challenging issue. In the recent years, the scientific community has particularly focused on multichannel techniques which are dealt with in this review. In fact, this study tries to classify these multichannel techniques into three main ones: Beamforming, Independent Component Analysis (ICA) and Time Frequency (T-F) masking. This paper also highlights their advantages and drawbacks. However these previously mentioned techniques could not afford satisfactory results. This fact leads to the idea that a combination of those techniques, which is depicted along this study, may probably provide more efficient results. Indeed, giving the fact that those approaches are still be considered as being not totally efficient, has led us to review these mentioned above in the hope that further researches will provide this domain with suitable innovations.
Intracranial Cryptococcal Infection in HIV Positive Patient  [PDF]
Nabil Moatassim Billah, Touria Amil, Souad Chaouir
Open Journal of Clinical Diagnostics (OJCD) , 2014, DOI: 10.4236/ojcd.2014.41001
Abstract: Cryptococcus neoformans is the most common fungal infection of the CNS. The majority of patients with cryptococcosis have preexisting immunodeficiency such as acquired immunodeficiency syndrome (AIDS). CT and/or MRI of the brain only occasionally detects abnormalities specifically related to this infection. We report a case of MR appearance of central nervous system cryptococcosis in a 33-year-old HIV positive man.
Mathematical Modeling of a Metabolic Network to Study the Impact of Food Contaminants on Genomic Methylation and DNA Instability  [PDF]
Etienne Z. Gnimpieba, Souad Bousserouel, Abalo Chango
Journal of Biosciences and Medicines (JBM) , 2014, DOI: 10.4236/jbm.2014.210001

Environmental contamination of food is a worldwide public health problem. Folate mediated one- carbon metabolism plays an important role in epigenetic regulation of gene expression and mutagenesis. Many contaminants in food cause cancer through epigenetic mechanisms and/or DNA instability i.e. default methylation of uracil to thymine, subsequent to the decrease of 5-methylte- trahydrofolate (5 mTHF) pool in the one-carbon metabolism network. Evaluating consequences of an exposure to food contaminants based on systems biology approaches is a promising alternative field of investigation. This report presents a dynamic mathematical modeling for the study of the alteration in the one-carbon metabolism network by environmental factors. It provides a model for predicting “the impact of arbitrary contaminants that can induce the 5 mTHF deficiency. The model allows for a given experimental condition, the analysis of DNA methylation activity and dumping methylation in the de novo pathway of DNA synthesis.

A Bayesian model for binary Markov chains
Souad Assoudou,Belkheir Essebbar
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s0161171204202319
Abstract: This note is concerned with Bayesian estimation of the transition probabilities of a binary Markov chain observed from heterogeneous individuals. The model is founded on the Jeffreys' prior which allows for transition probabilities to be correlated. The Bayesian estimator is approximated by means of Monte Carlo Markov chain (MCMC) techniques. The performance of the Bayesian estimates is illustrated by analyzing a small simulated data set.

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