Influence of digital health on public health protection against the COVID-19 panademic in Algeria

Covid-19, many challenges were faced by the people. Lacking of medical health facilities were top listed among these challenges. As a result of these issues, the medical system is paying more attention to digital Health. The purpose of this study was to examine the influence of digital health on public health protection against the COVID-19 pandemic via public health awareness and public health behavioural changes as mediating factors in Algeria. Population of the study was comprised of Algerian doctors and nurses. Five hundred and twenty two (522) respondents were selected as sample by using available sampling technique. For the collection of data a self-made questionnaire was developed and used for the collection of data. The collected data were analysed by using PLS-Smart program. Based on analysis, the researcher concluded that adoption of digital health can have a positive impact on public health behavioural changes and COVID-19 protection

Gouvernance et médias une relation étroite

Cet article a pour objectif de comprendre la relation qui existe entre la gouvernance et les médias. Nous considérons que le pluralisme des médias, doté d’un ensemble de valeurs permettant l’enrichissement du débat public, est un des repères essentiels de cette gouvernance. Dans cette optique, nous décrivons en premier lieu l’origine et le sens du concept de gouvernance. En deuxième lieu, nous nous penchons sur le rôle des médias et de l’information dans la gouvernance. En troisième lieu, nous nous intéressons à la relation qui lie la gouvernance et les médias. A partir de là, nous concluons que les médias doivent participer à l’amélioration de la gouvernance en acquérant une importance stratégique croissante. الملخص: يعالج هذا المقال أحد أهم مشكلات الديمقراطية والحوكمة والمتمثلة في تعددية و حرية وسائل الإعلام. يحاول نفس البحث التطرق إلى جوانب تعد ضرورية لمعالجة العلاقة الموجودة بين الحوكمة ووسائل الإعلام مع الإشارة إلي مجموعة من القيم لإثراء النقاش النظري. في المرحلة الأولى نتطرق إلى مفهوم الحوكمة ودور وسائل الإعلام والمعلومات في ترسيخ هذا المفهوم، وفي المرحلة الثانية نبحث في العلاقة الموجدة بينهما. ففي الأخير نخلص إلى أن وسائل الإعلام ينبغي أن تساهم في تحسين وتعزيز مفهوم الحوكمة أو الحكم الرشيد

Total Phenolic Contents and Antioxidant Properties of Algerian Arbutus unedo L. Extracts

Arbutus unedo L. is a plant widely distributed in the Mediterranean basin and North Africa, frequently used in traditional folk medicine to treat diabetes and arterial hypertension. This study aims to evaluate the phenolic composition and antioxidant activity of ethyl acetate (EA.E) and n-butanolic (But.E) extracts prepared from leaves of Arbutus unedo. Total phenolic and flavonoids contents were determined spectrophotometrically. The antioxidant activity was evaluated using DPPH•, OH•, H2O2, O•-2, ß-carotene bleaching and AAPH-induced erythrocyte oxidative hemolysis assays. The phytochemical analysis showed the presence of polyphenols and flavonoids in both extracts. The high amount was observed in EA.E which exerted the stronger antioxidant effect, with IC50 values of 3.43 μg/mL, 323.45 µg/mL, 38.40 µg/mL and 11.56 µg/mL, in DPPH•, OH•, O•-2 and H2O2 tests, respectively. Both extracts inhibited β-carotene bleaching, but EA.E is always more potent (92%) than But.E (85%). Furthermore, the EA.E showed the highest protective effect on erythrocyte hemolysis induced by AAPH, with half time hemolysis (HT50) of 122.02 min at 40 µg/mL. Taken together, this study showed that Arbutus unedo leaf extracts possess strong antioxidant potential, which may be attributed to the presence of a high amount of polyphenolic constituents. So, this plant might be exploited as a potential source of natural antioxidant agents for pharmaceutical and food applications. Keywords: oxidative stress, antioxidant, phenolic compounds, Arbutus unedo

Free Radical Scavenging Activity, Reducing Power and Anti-Hemolytic Capacity of Algerian Drimia maritima Baker Flower Extracts

This study was undertaken to evaluate the antioxidant and anti-hemolytic properties of Algerian Drimia maritima Baker flower extracts. Determination of phenolic content was carried out to estimate the chemical composition of D. maritima extracts. Antioxidant properties were investigated in all extracts using free radical scavenging activity (against DPPH, ABTS, hydroxyl radical, and superoxide anion), reducing power, inhibition of lipid peroxidation, and anti-hemolytic capacity. Phenolic determination revealed that D. maritima flowers contain phenolic compounds, flavonoids, and tannins. Ethyl acetate extract showed the highest reducing power and scavenging activity using DPPH and ABTS assays. However, aqueous extract was the most effective against hydroxyl radical, superoxide anion, and lipid peroxidation. The half-time of hemolysis indicates that chloroform extract exhibited the best anti-hemolytic capacity in the AAPH induced hemolysis model. The results of this study suggest that D. maritima could be used as a possible source of antioxidant phenolic compounds and that further determination of these compounds may provide more information on their medicinal value.  Keywords: Drimia maritima, phenolic compounds, scavenging activity, reducing power, anti-hemolytic

Gestion de l'incertitude et codage des politiques de sécurité dans les systèmes de contrôle d'accès

La présente thèse s'intéresse à coder la politique de sécurité SELinux en OrBAC et à proposer une extension de ce modèle. Nous avons commencé par présenter l'état de l'art des différents modèles de contrôles d'accès présents dans la littérature en mettant en exergue les limites de chacun de ces modèles. Ensuite nous avons présenté le modèle OrBAC comme étant une extension du modèle RBAC, car d'une part il a apporté la notion de contexte et d'organisation et d'autre part il permet d'exprimer, en plus des permissions, des interdictions et des obligations. Ensuite, nous avons présenté la solution de sécurité SELinux qui utilise un ensemble de modèles de contrôle d'accès comme DAC, RBAC et MAC. Nous avons recensé plusieurs centaines, voire des milliers, de règles dans la politique de sécurité SELinux, ces règles peuvent concerner des décisions d'accès ou des décisions de transition. Nous avons ensuite pu coder lesdites règles en modèle OrBAC, et ce en passant par le remplissage ses tables d'entité, pour ensuite les transformer en relations OrBAC. Notre thèse a aussi rappelé les fondements de la logique possibiliste, et a ensuite apportée une amélioration importante du modèle OrBAC, il s'agit de l'introduction de l'entité priorité au niveau de chaque relation du modèle OrBAC. L'entité priorité quantifie la certitude pour qu'une entité concrète soit injectée dans l'entité abstraite correspondante, ou en cas général, le degré de certitude pour qu'une relation soit réalisée. Nous avons proposé trois modes de combinaison (pessimiste, optimiste et avancé) qui peuvent être adoptés pour déterminer la valeur de la priorité de chaque relation concrète à partir des priorités des relations abstraites correspondantes. Enfin, nous avons implémenté, via une application développé par DELPHI, le codage des règles concernant les décisions d'accès de la politique de sécurité SELinux, en modèle OrBAC tout en introduisant la notion de priorité.This thesis focuses on encoding default-based SELinux security policy in OrBAC and propose an extension of this model. We presented the state of the art of different models of access controls present in the literature underlining the limitations of each of these models. Then we presented the model OrBAC as an extension of the RBAC model, firstly because he brought the notion of context and organization and secondly it allows expressing, in addition to permissions, prohibitions and obligation. Then we presented the SELinux security solution that uses a set of access control models such as DAC, RBAC and MAC. We identified several hundreds or even thousands of rules in SELinux security policy, these rules may be access decisions or decisions of transition. We could then encode these rules in OrBAC model, and via filling its tables of entities, then transform relations OrBAC. Our thesis also reviewed the foundations of possibilistic logic, and then made an important enlargement in OrBAC model; it's to introduce an entity called "priority" in each relationship model OrBAC. The entity "priority" quantifies the certainty for concrete entity injection into the corresponding abstract entity, in general, it's meaning the degree of certainty that a relationship is performed. We proposed three modes of combination (pessimistic, optimistic and advanced) that can be adopted to determine the concrete relations priority value from priorities values of each corresponding abstract relationship. Finally, we implement, via an application developed by DELPHI, coding access decisions rules of the SELinux policy in OrBAC model introducing the priority entity.ARRAS-Bib.electronique (620419901) / SudocSudocFranceF

Review: Pharmacological effects of Capparis spinosa L.

Medicinal plants have been known as one of the most important therapeutic agents since ancient times. During the last two decades, much attention has been paid to the health-promoting effects of edible medicinal plants, because of multiple beneficial effects and negligible adverse effects. Capparis spinosa L. is one of the most common medicinal plants, used widely in different parts of the world to treat numerous human diseases. This paper aims to critically review the available scientific literature regarding the health-promoting effects of C. spinosa, its traditional uses, cultivation protocols and phytochemical constituents. Recently, a wide range of evidence has shown that this plant possesses different biological effects, including antioxidant, anticancer and antibacterial effects. Phytochemical analysis shows that C. spinosa has high quantities of bioactive constituents, including polyphenolic compounds, which are responsible for its health-promoting effects, although many of these substances are present in low concentrations and significant changes in their content occur during processing. In addition, there is negligible scientific evidence regarding any adverse effects. Different health promotion activities, as well as tremendous diversity of active constituents, make C. spinosa a good candidate for discovering new drugs. However these findings are still in its infancy and future experimental and clinical studies are needed

Symposium, Integrated Paper Session, Paper, Interactive (Poster) Session, State-of-the-Art Lecture, Keynote Address

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Comportements non verbaux, mensonge et enjeu de sincérité

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Comportements verbaux et non verbaux dans la détection du mensonge

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L'analyse de similitude

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