Clinical and seroepidemiological study of Leishmaniasis in Northern Morocco

Une étude clinique, parasitologique et sérologique entreprise de 1993 à 1996 dans trois régions (17 localités) du nord du Maroc a révélé une fréquence élevée de la leishmaniose canine. 1362 chiens ont été examinés. Les sérums ont été collectés et testés selon la technique ELISA utilisant la souche locale Leishmania infantum comme antigène. Les résultats obtenus ont révélé une séroprévalence (quand elle n’est pas nulle) allant de 3,77% à 35,7%. Six isolats ont été caractérisés : 5L eishmania infantum ont été identifiés dans les provinces de Khémisset et Taza et une souche Leishmania tropica isolé d’un cas leishmanien dans la province de Taounate. La majorité des chiens cliniquement suspects ont montré des lésions ulcératives de la peau, amaigrissement, onychogriffose et lymphadenopathie. L’alopécie, la cécité et la diarrhée ont été observés uniquement dans la province de Khémisset

Frequency tunable antennas based on innovative materials

International audienc

Limits of DC bus behavior on photovoltaic systems in distributed architecture

International audienc

Adsorptive removal of amoxicillin from wastewater using wheat grains: equilibrium, kinetic, thermodynamic studies and mass transfer

International audienceWheat grains are natural products which grow in the north of Algeria. In this study, they were used as adsorbent to remove amoxicillin antibiotic from wastewater. Adsorption isotherm of amoxicillin on both crude and modified wheat grains with 20% tartaric acid was investigated in batch tests. A model was developed regarding both the kinetic partitioning and the mechanism governing the forward transfer of amoxicillin. Results were interpreted in terms of a two-film theory for flat interface. The percentage of maximum adsorption capacity of amoxicillin was found to be 84% for the following optimal conditions: amoxicillin concentration of 4 mg/L, 5 min contact time, pH 7, temperature 25°C, and 0.24 g/L initial amoxicillin concentration and 150 μg particle size. The pseudo-first-order, pseudo-second-order kinetic models and the intraparticle diffusion model were used to describe the kinetic data, and the rate constants were evaluated. It was found that the pseudo-second-order model provides the most adequate correlation of experimental data. The rate parameters of the intraparticle diffusion model for adsorption were also evaluated and to identify the adsorption mechanisms. The adsorption constants were evaluated by using the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) adsorption isotherm models. The results showed that Temkin isotherm agrees with experimental data better than other adsorption models for the adsorption of amoxicillin. The thermodynamic parameters (ΔG, ΔH, and ΔS) showed that the process was feasible, spontaneous, and exothermic. © 2016 Balaban Desalination Publications. All rights reserved

Electronic structures and magnetic behavior of Al-, Si-, P- and Cl-doped ZnS

International audienc

Potentiometric studies and modelization of ternary complexes of nickel(II) with a tetradentate Schiff-base and its reduced form as the primary ligand and methionine and cysteine as the secondary one.

International audienceThe stability constants of binary and ternary complexes of nickel(II) with two tetradentate ligands: bis(2-hydroxyacetophenone) ethylenediamine (H2BS) and N,N´-bis(2-hydroxyacetophenyl)-1,2-diaminoethane (H2BSR) as primary ligands and two amino acids: methionine (Met) and cysteine (Cys) as secondary ones, were determined by potentiometric measurements at constant temperature (25.0 ± 0.1ºC) and ionic strength (0.2 mol L-1, NaCl) in water-ethanol (90 : 10 w/w) medium. Two species are formed for which the molar ratio of metal to BS or BSR and Met or Cys are 1 : 1 : 1 and 1 : 1 : 2. The binary and ternary complexes of BSR are more stable than those of BS. The values of D log K constant show that ternary complexes have a higher stability than the corresponding binary ones in the case of methionine but not for cysteine. The geometry of all the species formed have been optimized by molecular mechanics using the EMO program. It was found that there is a direct correlation between the stability constants of the ternary complexes and their steric energy