University of Cartage

Nabeul, Tunisia

University of Cartage

Nabeul, Tunisia
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Bere E.,University of Poitiers | Lahbib K.,University of Cartage | Merceron B.,University of Poitiers | Fleurat-Lessard P.,CNRS Ecobiological Interactions | Boughanmi N.G.,University of Cartage
Journal of Plant Physiology | Year: 2017

Vacuoles have been shown to undergo deep modifications in relation to plant developmental stages and in the maintaining the cellular homeostasis. In this context, we studied the variations of the vacuolar membrane size and α-TIP aquaporin distribution at early and advanced seed stages of maturation, germination and embryo growth in Vicia faba cotyledon storage cells. © 2017 Elsevier GmbH


Akacha M.,University of Cartage | Lahbib K.,University of Cartage | Remadi M.D.,University of Sousse | Ghanem Boughanmi N.,University of Cartage
Bangladesh Journal of Pharmacology | Year: 2016

The aim of the present study is to examine the antibacterial, antifungal and anti-inflammatory activities of the ethanolic leaf extract of Melia azedarach. It was tested in vitro for its antibacterial and antifungal activities against E. coli (ATCC 8739), Enterococcus faecalis (Ec P07) and Bacillus subtilis (Bs) bacteria as well as against pathogenic fungi (Alternaria alternate, Fusarium solani, Fusarium oxysporum sp. melonis, F. oxysporum f. sp. lycopersici, F. sambucinum and Botrytis cinerea) with different techniques similtaneously with anti-inflammatory activity with carageaneen method. All tested concentrations of M. azedarach extract showed significant antibacterial and antifungal activities with low IC50 compared to ethanol 95% and a high anti-inflammatory activity compared with indomethacin as drug. Our investigation pointed that M. azedarach could be considered as a good medicinal agent. © 2016, Bangladesh Pharmacological Society. All rights reserved.


Akacha M.,University of Cartage | Karima L.,University of Cartage | Boughanmi N.G.,University of Cartage
Bangladesh Journal of Pharmacology | Year: 2016

Phytotherapy is a discipline which is interested in the design, preparation and interpretation of Structure Activity Relationship of the natural bioactive molecules. In this context, ethanolic leaves extract of Melia azedarach was phytochemically analyzed on the bases of HPLC and GC–MS. Extract was tested for in vitro anti-oxidant activities by 1,1-diphenyl-2-picrylhydrazyl (DPPH), H2O2, hydroxyl radical scavenging activity, Ferric Reducing Power (FRP) and ferrous ion chelating abilities methods. The anti-oxidant activity of the extract was analyzed simultaneously with their pro-oxidant capacity. The ratio of pro -oxidant to the anti-oxidant activity (ProAntidex) represents a useful index of the net free radical scavenging potential of the synthesized compounds. Tested extract showed significant anti-oxidant activity with a moderate ProAntidex. © 2016, Bangladesh Pharmacological Society. All Rights Reserved..


Maiz F.,University of Cartage | Maiz F.,King Khalid University
Physica B: Condensed Matter | Year: 2015

A novel method to calculate the quantum transmission, resonance and eigenvalue energies forming the sub-bands structure of non-symmetrical, non-periodical semiconducting heterostructure potential has been proposed in this paper. The method can be applied on a multilayer system with varying thickness of the layer and effective mass of electrons and holes. Assuming an approximated effective mass and using Bastard's boundary conditions, Schrödinger equation at each media is solved and then using a confirmed recurrence method, the transmission and reflection coefficients and the energy quantification condition are expressed. They are simple combination of coupled equations. Schrödinger's equation solutions are Airy functions or plane waves, depending on the electrical potential energy slope. To illustrate the feasibility of the proposed method, the N barriers - (N-1) wells structure for N=3, 5, 8, 9, 17 and 35 are studied. All results show very good agreements with previously published results obtained from applying different methods on similar systems. © 2015 Elsevier B.V. All rights reserved.


Abdelhedi M.,National Engineering School of Tunis | Hamdi O.,University of Cartage | Bouallegue A.,National Engineering School of Tunis
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

In 1989, N.Sourlas used the parallel that exists between the information theory and the statistical physics to bring out that low density parity check (LDPC) codes correspond to spins glass models. Such a correspondence is contributing nowadays to the similarity between the statistical physics and the error correcting codes. Hence, the statistical physics methods have been applied to study the properties of these codes. Among these methods the Thouless-Anderson-Palmer (TAP) is an approach which is proved to be similar to the Belief Propagation (BP) algorithm. Unfortunately, there are no studies made for the other decoding algorithms. The main purpose of this paper is to provide a statistical physics analysis of LDPC codes performance. First, we investigate the Log-Likelihood Ratios-Belief Propagation (LLR-BP) algorithm as well as its simplified versions the BP-Based algorithm and the λ-min algorithm with the TAP approach. Second, we evaluate the performances of these codes in terms of a statistical physics parameter called the magnetization on the Additive White Gaussian Noise (AWGN) channel. Simulation results obtained in terms of the magnetization show that the λ-min algorithm reduces the complexity of decoding and gets close to LLR-BP performance. Finally, we compare our LLR-BP results with those of the replica method. © Springer International Publishing Switzerland 2015.


Chihi H.,University of Cartage | Bedir M.,University of Cartage | Belayouni H.,Tunis el Manar University
Natural Resources Research | Year: 2013

This article describes a proposed work-sequence to generate accurate reservoir-architecture models, describing the geometry of bounding surfaces (i. e., fault locations and extents), of a structurally complex geologic setting in the Jeffara Basin (South East Tunisia) by means of geostatistical modeling. This uses the variogram as the main tool to measure the spatial variability of the studied geologic medium before making any estimation or simulation. However, it is not always easy to fit complex experimental variograms to theoretical models. Thus, our primary purpose was to establish a relationship between the geology and the components of the variograms to fit a mathematically consistent and geologically interpretable variogram model for improved predictions of surface geometries. We used a three-step approach based on available well data and seismic information. First, we determined the structural framework: a seismo-tectonic data analysis was carried out, and we showed that the study area is cut mainly by NW-SE-trending normal faults, which were classified according to geometric criteria (strike, throw magnitude, dip, and dip direction). We showed that these normal faults are at the origin of a large-scale trend structure (surfaces tilted toward the north-east). At a smaller scale, the normal faults create a distinct compartmentalization of the reservoirs. Then, a model of the reservoir system architecture was built by geostatistical methods. An efficient methodology was developed, to estimate the bounding faulted surfaces of the reservoir units. Emphasis was placed on (i) elaborating a methodology for variogram interpretation and modeling, whereby the importance of each variogram component is assessed in terms of probably geologic factor controlling the behavior of each structure; (ii) integrating the relevant fault characteristics, which were deduced from the previous fault classification analysis, as constraints in the kriging estimation of bounding surfaces to best reflect the geologic structure of the study area. Finally, the estimated bounding surfaces together with seismic data and variogram interpretations were used to obtain further insights into the tectonic evolution of the study area that has induced the current reservoirs configuration. © 2013 International Association for Mathematical Geology.


Maiz F.,University of Cartage | Maiz F.,King Khalid University
Physica B: Condensed Matter | Year: 2014

Assuming an approximated effective mass and using Bastard's boundary conditions, a simple method is used to calculate the subband structure for periodic semiconducting heterostructures. Our method consists to derive and solve the energy quantification condition (EQC), this is a simple real equation, composed of trigonometric and hyperbolic functions, and does not need any programming effort or sophistic machine to solve it. For less than ten wells heterostructures, we have derived and simplified the energy quantification conditions. The subband is build point by point; each point presents an energy level. Our simple energy quantification condition is used to calculate the subband structure of the GaAs/Ga0.5Al0.5As heterostructures, and build its subband point by point for 4 and 20 wells. Our finding shows a good agreement with previously published results. © 2014 Elsevier B.V.


Maiz F.,University of Cartage | Maiz F.,King Khalid University
Physica B: Condensed Matter | Year: 2014

We propose a new simple quantization rule form: Jn= nπ+δ(n), for exactly solvable and nonsolvable quantum systems. Here, Jn is the momentum integral between two turning points, n the principal quantum number, and δ(n) is a function of potential parameters and n. This new quantization rule form is a generalization of the conventional one, already developed for exactly solvable quantum systems. We found that δ(n) is a constant independent of n for exactly solvable quantum systems. We carry out the expression of δ(n) for V-shape potential, and show that it takes this form δ(n)=(π/2)+(1/a+bn+cn2) for anharmonic oscillators potential V(x)=αxp+βx2. © 2014 Elsevier B.V.


Maiz F.,King Khalid University | Maiz F.,University of Cartage | Alfaify S.,King Khalid University
Physica B: Condensed Matter | Year: 2014

New and simple numerical method is being reported to solve anharmonic oscillator problems. The method is setup to approach the real potential V(x) of the anharmonic oscillator system as a piecewise linear potential u(x) and to solve the Schrödinger equation of the system using the Airy function. Then, solutions continuity conditions lead to the energy quantification condition, and consequently, the energy eigenvalues. For testing purpose, the method was applied on the sextic and octic oscillators systems. The proposed method is found to be realistic, computationally simple, and having high degrees of accuracy. In addition, it can be applied to any form of potential. The results obtained by the proposed method were seen closely agreeing with results reached by other complicated methods. © 2014 Elsevier B.V.


Maiza F.,King Khalid University | Maiza F.,University of Cartage | Eissa S.A.,King Khalid University | Eissa S.A.,Cairo University | AlFaify S.,King Khalid University
Physica B: Condensed Matter | Year: 2013

Assuming an effective mass approximation and using Bastard's boundary conditions, a simple method for simultaneous determination of the energy levels forming the sub-band structure and the transmissions coefficient of non-symmetrical, non-periodical potential semiconducting heterostructure is being proposed. The method can be applied on a multilayer system with varying thickness and effective mass of the layers, and with potential that is neither periodical nor symmetrical. To illustrate the feasibility of the proposed method, cases of symmetrical rectangular triple-barrier structure with constant effective mass, multi-barrier semiconductor heterostructure (nine barriers-eight-wells), and monomer height barrier superlattices (300 barriers) systems have been examined. Findings show very good agreements with previously published results obtained by different methods on similar systems. The proposed method was found to be useful for any number of semiconducting layers arranged in any random way making it more realistic, simple, and applicable to superlattice analysis and for devices design. © 2013 Elsevier BY. All rights reserved.

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