In vitro assessments of cytotoxic and cytostatic effect of two [Cu(dien)(N-N)]Br2 complexes on L6, HCT, PC3 and HepG2 cancer cells

Two new Cu(II) complexes of type [Cu(dien)(N-N)] Br2 (dien is diethlylenetriamine, C1 complex with N-N = diethlylenetriamine and C2 complex with N-N = propyl-1,3-diamine) were made valuable  and in vitro screened for both cytostatic and cytotoxic activities against four cell lines: colon cancer (HCT), liver cancer (HepG2), prostate cancer (PC3) and as control cell (L6) human muscle cell was used via MTT test. The results reflected these complexes as a promising activity antiprolifrative agent against the used cell lines indicating that C1 and C2 complexes have a high anticancer activity at non-toxic concentrations

Methionine derivatives as green corrosion inhibitors: Review

This review exposed the inhibitory effect of methionine as green compound and its derivatives. The efficacy of these kind of molecules is related to two combined groups: amine and carboxylic acid as well as the presence of sulphur atom. Search on Scopus showed that a hundred publications in various aggressive solutions as HCl, H2SO4, H3PO4, HNO3, NaCl. The corrosion of iron, aluminium, lead, copper, nickel, tin … can be retarded using methionine derivatives which adsorbed on several kind of adsorption isotherms depending on the nature of metal/solution interface

Overall Migration of the High Density Polyethylene in Bags used for carrying Hot Breads in the Traditional Bakeries

The main objective of this study to identify the effects of the temperature for the high density polyethylene (HDPE) used for carrying hot breads in the traditional bakeries (17 bakeries). From the results of the experimental analysis we found plastic components migration from the three types of the HDPE in the both simulants, distilled water and 3% of Acetic acid, at 70ᵒC and 100ᵒC of temperature. The obtained results concerning types A, B and C plastic bags in the distilled water simulant at 70ᵒC were 0.40, 0.90 and 2.60, thus at 100ᵒC were 0.60, 1.10 and 2.90 respectively .On the other hand, the obtained data for 3% of acetic acid at 70ᵒC were 0.80, 29.90 and 59.20, also at 100ᵒC were 0.90, 54.60 and 116 respectively. If we compared the obtained results between the two simulants we could mention that, there is significant relationship. We could confirm that there are significant relationships between the distilled water simulant and the 3% of Acetic acid simulant at both temperatures (70 and 100 ᵒC). The big deferent between A, B and C bags in the 3% of acetic acid concern the color of the bags

Ecriteaux dans l’espace public: quel bénéfice pour la didactique des langues ?

Résumé Chaque Le présent travail s’intéresse principalement aux écriteaux dans l’espace public, la question des flux des langues et son impact sur l’apprentissage du FLE. S’appuyant sur une démarche empirico-inductive, l’objectif de cette étude est de relever et d’expliquer comment se fait le marquage dans la ville afin de montrer les différentes répercussions qu’il peut avoir sur la didactique des langues.  L’espace ainsi que sa mise en mots (principalement à travers les écriteaux et les plaques signalétiques) constituent le matériau   de base qui servira à répondre aux différentes questions sur les langues étrangères, les toponymes ainsi que la relation qu’ils entretiennent avec l’identité urbaine de la ville. Vivant dans un univers saturé d’éléments visuels, les jeunes d’aujourd’hui accordent de plus en plus d’importance aux représentations visuelles. A présent, ces supports hantent notre quotidien et s’offrent à nos yeux moment à travers les réseaux sociaux. Cette introduction massive peut-elle avoir un impact sur l’apprentissage du FLE ? Après une présentation de l’objet de cette recherche, nous exposerons le cadre conceptuel et la méthodologie adoptée pour recueillir et analyser les données relatives aux situations dans lesquelles nous avons travaillé.

Klein's Paradox

We solve the one dimensional Feshbach-Villars equation for spin-1/2 particle subjected to a scalar smooth potential. The eight component wave function is given in terms of the hypergeometric functions and via a limiting procedure, the wave functions of the step potential are deduced. These wave functions are used to test the validity of the boundary conditions deduced from the Feshbach-Villars transformation. The creation of pairs is predicted from the boundary condition of the charge density.Comment: 18 pages, Latex, another title has been used in the published versio

3D wedge filling and 2D random-bond wetting

Fluids adsorbed in 3D wedges are shown to exhibit two types of continuous interfacial unbinding corresponding to critical and tricritical filling respectively. Analytic solution of an effective interfacial model based on the transfer-matrix formalism allows us to obtain the asymptotic probability distribution functions for the interfacial height when criticality and tricriticality are approached. Generalised random walk arguments show that, for systems with short-ranged forces, the critical singularities at these transitions are related to 2D complete and critical wetting with random bond disorder respectively.Comment: 7 pages, 3 figures, accepted for publication in Europhysics Letter

L’utilisation du tableau en classe : vers des gestes professionnels plus ajustés.

Le tableau est un objet central dans l’espace classe, il définit l’espace de transmission du savoir en classe. C’est un outil visible par tous à savoir l’enseignant, l’apprenant et l’institution. Il constitue le support des connaissances en construction puis  l’espace sur lequel est formalisée la connaissance, le savoir constitué à maîtriser. Le tableau comporte une double composante : matérielle ou symbolique.Cette constatation amène à prendre conscience du pouvoir que le tableau a dans la pratique enseignante et nous amène à réfléchir sur les gestes professionnels qui accompagnent son utilisation. Vue utilité indéniable en classe, son utilisation peut accentuer cette utilité ou la minimiser, voire dans certains cas inverser sa portée

Phytochemical study of four leaves extracts of Chamærops humilis L. from the region of Al-Hoceima, Morocco

The objective of this study was to compare the relative yields of two extraction methods (maceration and soxhlet extraction) using solvents of different polarities and to quantitively and qualitatively assess the secondary metabolite contents of the Chamærops humilis L. plant. In the experiments, we used the maceration and the extraction processes using soxhlet. Several solvents were used, such as diethyl ether, ethyl acetate, ethanol, and water. For the phytochemical screening, we relied on the color and precipitation tests, and for the quantitative determination of the content of total phenol, flavonoids, and flavonols, we used conventional methods. The results showed that the phytochemical screening of the various extracts showed the presence of the majority of metabolite dispersed between the four extraction solvents with exception of alkaloids and proteins which are absent in all the extracts. For the total phenol content, it was in large amounts in the ethanolic extract for the maceration technique and a large amount in the aqueous extract for the soxhlet extraction. In addition to flavonoids and flavonols, experimental tests have shown that ethanol has well extracted these two types of components. The plant Chamærops humilis L. from our region has shown the presence of a high concentration of total phenol and more precisely flavonoids, which can prove its use as an antibiotic for a lot of diseases

Assessment of dysarthric speech through rhythm metrics

AbstractThis paper reports the results of acoustic investigation based on rhythmic classifications of speech from duration measurements carried out to distinguish dysarthric speech from healthy speech. The Nemours database of American dysarthric speakers is used throughout experiments conducted for this study. The speakers are eleven young adult males with dysarthria caused by cerebral palsy (CP) or head trauma (HT) and one non-dysarthric adult male. Eight different sentences for each speaker were segmented manually to vocalic and intervocalic segmentation (176 sentences). Seventy-four different sentences for each speaker were automatically segmented to voiced and non-voiced intervals (1628 sentences). A two-parameters classification related to rhythm metrics was used to determine the most relevant measures investigated through bi-dimensional representations. Results show the relevance of rhythm metrics to distinguish healthy speech from dysarthrias and to discriminate the levels of dysarthria severity. The majority of parameters was more than 54% successful in classifying speech into its appropriate group (90% for the dysarthric patient classification in the feature space (%V, ΔV)). The results were not significant for voiced and unvoiced intervals relatively to the vocalic and intervocalic intervals (the highest recognition rates were: 62.98 and 90.30% for dysarthric patient and healthy control classification respectively in the feature space (ΔDNV, %DV))