Effect of dietary vitamin E supplementation on lipid and colour stability of chicken thigh meat

Lipid and myoglobin oxidation are major causes of meat quality deterioration during storage of fresh chicken meat. Our objective is to determine the effects of dietary -tocopherol supplementation on lipid and colour stability of fresh chicken thigh meat exposed in a supermarket shopwindow or stored in a refrigerator. Chickens were fed with diets containing 25 (control), 100, 200 or 300 mg vitamin E/kg of food for 20 days before slaughtering. Peroxide value (PV) and oxidation products specific extinctions (K232 and K270), chosen as markers for oxidative deterioration of lipids, were lower in chicken meat from animals supplemented with 200 or 300 mg vitamin E than that of the control meat upon storage during 5 days in a shopwindow (p < 0.01) or 9 days in a refrigerator (p < 0.01). Vitamin E dietary supplementation (200 mg vitamin E/kg of food) reduced oxidation products formation in fresh thighs meat but had no significant impact on colour analysed by value redness (a*) measurements

Structure/function/properties relationships and application of a GH11 xylanase

Xylanases are hemicellulolytic enzymes, which are responsible for the degradation of the heteroxylans constituting the lignocellulosic plant cell wall. Due to their variety, xylanases have been classified in glycoside hydrolase families GH5, GH8, GH10, GH11, GH30 and GH43 in the CAZy database. In this work, we focus on GH11 family, which is one of the best characterized GH families with bacterial and fungal members. GH11 xylanases have for a long time been used as biotechnological tools in various industrial applications and represent in addition promising candidates for future other uses

Mésusage traditionnel du camphre: un danger oublié pour les enfants (à propos de 2 cas)

Dans notre pays, le recours aux recettes de médecine traditionnelle et aux produits cosmétiques artisanaux est très fréquent en raison du taux élevé d'analphabétisme, du faible pouvoir d'achat et du grand nombre d'herboristes. Le camphre est un produit peu coûteux, facilement accessible et omniprésent dans presque toutes les maisons, le rendant potentiellement toxique en cas de mauvaise utilisation, en particulier chez les enfants. Nous rapportons ici l'histoire de 2 cas d'intoxication consécutifs à une recette de beauté à base de camphre en poudre. L'anamnèse donne des informations sur un empoisonnement par une poudre synthétique à base de camphre importé de Chine chez 2 enfants. Patiente 1: fille âgée de 2 mois, sans antécédents, admise aux urgences pédiatriques dans un état de pleurs incessants avec refus de manger. L'examen clinique est sans caractéristique particulière. Le test biologique standard était normal. Le nourrisson était sous surveillance neurologique, digestive et cutanée. Patiente 2: jeune fille de 6 ans admise à la suite d'une crise atonique avec syncope et mousse, suivie d'une douleur abdominale accompagnée d'une douleur abdominale accompagnée de vomissements alimentaires consécutifs à l'ingestion de lait. L'évolution était favorable après 48 heures de prise en charge symptomatique. L'entretien avec les mères a révélé qu'il s'agissait de deux voisins qui avaient reçu une recette traditionnelle pour le soin des cheveux d'un troisième voisin, après quoi ils avaient mélangé du camphre en poudre avec de l'huile d'olive, puis l'avaient appliquée pendant 1 heure sur les cheveux de leurs enfants, provoquant ainsi l'apparition de ces signes

Analyse Du Comportement Dynamique Des Plaques Stratifiées Rectangulaires Minces Symétriques en Matériaux Composites

le travail présenté dans ce mémoire est une analyse numérique des vibrations libres des plaques rectangulaires minces symétriques en matériaux composite stratifié. L'analyse a été basée sur un élément rectangulaire à quatre noeuds de type Hermite adapté aux stratifié, pour examiner l'influence de certain paramètre, tell que le rapport géométrique, l'orientation des fibres et les conditions aux limites,…etc. sur la variation des fréquences propres. Au travers un série d’exemples et comparaison avec des résultats de la littérature, la convergence et la précision des cette élément a été vérifié

Catalyseurs Pt- deposes sur silice. Etude de la composition superficielle et cinetique de l'hydrogenolyse du butane

SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : T 79129 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Autonomous Vehicle and Pedestrian Interaction : Leveraging the Use of Model Predictive Control & Genetic Algorithm

Driving assistance systems and even autonomous driving have and will have an important role in sustainable mobility systems. Traffic situations where participants’ cognitive levels are different will cause challenges in the long term. When a pedestrian crosses the road, an autonomous vehicle may need to navigate safely while maintaining its desired speed. Achieving this involves using a predictive model to anticipate pedestrian movements and a strategy for the vehicle to adjust its speed proactively. This research combined model-based predictive control (MPC) with a social-force model (SFM) to effectively control the autonomous vehicle’s longitudinal speed. A genetic algorithm (GA) was also integrated into the approach to address the optimisation problem. A comparison between the proposed approach (MPC-GA) and the conventional MPC technique proved the outperformance of MPC-GA

Biochemical and molecular characterization of a recombinant \u3b1-amylase from Bacillus subtilis

Alpha amylase (EC3.2.1.1), one of more widespread enzymes in the industrial world, is a glycoside hydrolase. It hydrolyzes the \u3b1- (1,4) glucoside linkage between the glucose units of a polysaccharide. Microbial amylases, particularly those from Bacillus genus are more in demand than those from other sources. Alpha-amylases have potential application in wide number of industrial applications such as textile, paper, detergent, food, fermentation and pharmaceutical industries. Recombinant DNA technology for amylase production involves the selection of an efficient amylase gene, its insertion into an appropriate vector system, transformation in an efficient bacterial system to produce high amount of recombinant protein. In this context, the aim of this work is the overexpression of an\u3b1amylase gene from Bacillus subtilisUS572in E. coli strain and the characterization of the recombinant amylase which is an interesting candidate for biotechnological applications

Correlation between experimental and DFT calculations of photocatalytic and optical properties of La0.8Nd0.1Sr0.1MnO3 perovskite: degradation efficiency of methyl orange dye under visible-irradiated conditions

La0.8Nd0.1Sr0.1MnO3 perovskite was synthesized using the citrate gel method. The crystal structure was studied by X-ray diffraction. The Rietveld refinement reveals a single R-3C rhombohedral structure. The morphological properties were investigated by a scanning electron microscopy, connected to an energy-dispersive X-ray detector for mapping and elements composition, showing a sponge-like structure behavior of agglomerated particles. The band gap energy and the optical properties were studied theoretically by Density-Functional Theory (DFT) calculations. It showed that La0.8Nd0.1Sr0.1MnO3 exhibited a high photoabsorption property with band gap energy of ≈ 2.5\ua0eV. The methyl orange (MO) degradation properties were studied by measuring time-dependent UV–Visible absorption of the dye solution. The photocatalytic activity was evaluated at different times under visible light and ambient temperature conditions for La0.8Nd0.1Sr0.1MnO3 solution. A high degradation rate of 80% in 120\ua0min under UV irradiation conditions was observed. It indicated that La0.8Nd0.1Sr0.1MnO3 presents high photocatalytic efficiency and could be a good candidate for MO degradation

Hypogammaglobulinémie acquise associée au thymome: le syndrome de Good

Le syndrome de Good (SG) est défini par l'association d'un thymome et d'un déficit immunitaire. Il se complique souvent d’infections bactériennes broncho-pulmonaires et rhino-sinusiennes. Cette entité ne représente que 5% des syndromes para-thymiques. Ces infections respiratoires récurrentes peuvent être à l’origine de dilatation des bronches associée au syndrome de Good. Nous rapportons l’observation d’une femme âgée de 52 ans, hospitalisée pour une pneumopathie infectieuse trainante. La tomodensitométrie thoracique a permis de mettre en évidence des dilatations des bronches associées à un thymome confirmé sur pièce opératoire. La découverte d’une hypogammaglobulinémie a permis de porter le diagnostic de syndrome de Good

Two new gene clusters involved in the degradation of plant cell wall from the fecal microbiota of Tunisian dromedary

Dromedaries are capable of digesting plant cell wall with high content of lignocellulose of poor digestibility. Consequently, their intestinal microbiota can be a source of novel carbohydrate-active enzymes (CAZymes). To the best of our knowledge, no data are available describing the biochemical analysis of enzymes in dromedary intestinal microbiota.To investigate new hydrolytic enzymes from the dromedary gut, a fosmid library was constructed using metagenomic DNA from feces of non-domestic adult dromedary camels living in the Tunisian desert. High-throughput functional screening of 13756 clones resulted in 47 hit clones active on a panel of various chromogenic and non-chromogenic glycan substrates. Two of them, harboring multiple activities, were retained for further analysis. Clone 26H3 displayed activity on AZO-CM-cellulose, AZCL Carob galactomannan and Tween 20, while clone 36A23 was active on AZCL carob galactomannan and AZCL barley β-glucan. The functional annotation of their sequences highlighted original metagenomic loci originating from bacteria of the Bacteroidetes/Chlorobi group, involved in the metabolization of mannosides and β-glucans thanks to a complete battery of endoand exo-acting glycoside hydrolases, esterases, phosphorylases and transporters