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OALib Journal期刊

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Effect of Cadmium Repartition on Nitrogen Metabolism in Tobacco Seedlings  [PDF]
Houda Maaroufi Dguimi, Khulud Alshehri, Chokri Zaghdoud, Ali Khalaf Albaggar, Mohamed Debouba
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1104000
Abstract:
Thirty-day-old tobacco seedlings (Nicotiana tabaccum, Bureley v) were subjected during one week to increasing cadmium (Cd) concentrations (0, 10, 20, 50 and 100 μM CdCl2). Increasing Cd stress led to a gradual decrease of dry weight (DW) production, water and nitrate contents. More than the half of Cd accumulated per plant was sequestered in the oldest leaf stage (S1 leaves). Leaves from S1 were the least affected by Cd stress. The activities of nitrate reductase (NR, EC 1.6.1.6), nitrite reductase (NiR, EC 1.7.7.1) were the least reduced in S1 leaves despite of the high presence of Cd ions. At 100 μM Cd, glutamine synthetase activity (GS, EC 6.3.1.2) from S1 leaves rose to become 2 times more important than control. Western Blot analysis showed that S1 GS activity induction was correlated to the GS1 and GS2 protein accumulation. Young leaves (S3 leaves) were more affected by Cd stress than old leaves. The GS activity reduction in S3 leaves was correlated to GS2 protein decrease detected by western-blot analysis. So, tobacco plant accumulated Cd ions in old leaves (S1 leaves) to protect younger leaves which are more sensitive to Cd effects. Leaves from S1 are a target organ to verify an eventual soil contamination per cadmium. This leaves may evolve adaptive process to partially inactivate Cd ions and maintain stable rate of nitrogen metabolism.
The impact of clothing style on bone mineral density among post menopausal women in Morocco: a case-control study
Fadoua Allali, Siham Aichaoui, Bouchra Saoud, Houda Maaroufi, Redouane Abouqal, Najia Hajjaj-Hassouni1
BMC Public Health , 2006, DOI: 10.1186/1471-2458-6-135
Abstract: The cases were osteoporotic women whose disease was assessed by bone mineral density measurement. Each patient was matched with a non osteoporotic woman for age, and body mass index. All our patients were without secondary causes or medications that might affect bone density. The veil was defined as a concealing clothing which covered most of the body including the arms, the legs and the head. This definition is this of the usual Moroccan traditional clothing style.178 post menopausal osteoporotic patients and 178 controls were studied. The mean age of the cases and the controls was 63.2 years (SD 7) and the mean body mass index was 32.1 (SD 8). The results of crude Odds Ratios analyses indicated that wearing a veil was associated with a high risk of osteoporosis: OR 2.29 (95% CI, 1.38–3.82). Multiparity or a history of familial peripheral osteoporotic fractures had also a significant effect on increasing the osteoporosis risk (ORs: 1.87 (95% CI, 1.05–3.49) and 2.01 (95% CI, 1.20–3.38)). After a multiple regression analysis, wearing the veil and a history of familial osteoporotic fractures remained the both independent factors that increased the osteoporosis risk (ORs: 2.20 (95% CI, 1.22–3.9) and 2.19 (95% CI, 1.12–4.29) respectively).our study suggested that in Moroccan post menopausal women, wearing a traditional concealing clothing covering arms, legs and head increased the risk of osteoporosis. Further studies are required to evaluate the clinical impact of the above findings and to clarify the status of vitamin D among veiled women in Morocco.Osteoporosis is a common disorder in the elderly population, and represents one of the most significant public health problems in the world. Osteoporosis can be assessed indirectly through a non-invasive measurement of bone mineral density (BMD). BMD is influenced by both genetic and environmental factors, and possibly interactions between them [1]. Vitamin D insufficiency (levels between 5 and 20 ng/ml) leads to calcium m
Asymptotic Design and Analysis of Multiuser Detector for UWB High Data Rate Channel Based on Channel Division Multiple Access  [PDF]
Houda Chihi, Ridha Bouallegue
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2122
Abstract:

In this paper, we study an innovative multiple access scheme that exploits the intrinsic properties of the wireless envi- ronment to improve the multiuser environment, so-called Channel Division Multiple Access (ChDMA) focusing on spectral efficiency analysis and system performance. In particular, we show that Simultaneous multiuser accessing to a common destination is made possible by considering the channel impulse response (CIR) of each user as a signature. We begin by the assumption of the channel state information available at the receiver. Then, we analyze the perform- ance of the ChDMA integration in a random environment over UWB high data rate channel. Next, we discuss the de- sign of MMSE and optimal receiver structure for such a system. Additionally, we show an asymptotic analysis behavior taking into account the channel eigenvalues distribution with the associated spectral efficiency.

Reducing the Complexity of Embedding by Applying the Reed Muller Codes
Houda Jouhari
International Journal of Computer Science Issues , 2012,
Abstract: Reed-Muller codes are widely used in communications and they have fast decoding algorithms. In this paper we present an improved data hiding technique based on the first order binary Reed-Muller syndrome coding. The proposed data hiding method can hide the same amount of data as known methods with reduction of time complexity from 2^m(2^m-1)2^{m+1} binary operations to 2^m (2^m -1) m binary operations.
Contes animaliers du Yémen
Houda Ayoub
Chroniques Yéménites , 2007,
Abstract: Patrimoine riche mais fragile, les contes yéménites sont l’objet d’un intérêt croissant de la part des chercheurs et des traducteurs, au Yémen comme en Europe. Fatima al-Baydan , qui a fondé en 2006 le centre M l Al-Dhahab (le Baton de Kohl ) pour la préservation du patrimoine oral de la mère et de l’enfant, a mené pendant une dizaine d’années un travail exceptionnel de collecte de contes, dans plusieurs gouvernorats du pays. L’atelier de traduction de l’école normale supérieure a rassemblé cinq contes brefs, issus de diverses régions, ayant tous pour personnages principaux des animaux. Animal Tales from YemenThe oral tales of Yemen are a very rich, but fragile heritage. They raise an increasing interest among the researchers and translators, in Yemen and abroad. Fatima al-Baydan , who created in 2006 the M l al-Dhahab ( the Kohl stick ) for the preservation of the oral litterature of the children and mothers, gathered an outstanding amount of tales in many governorates. The Ecole Normal Supérieure tranlation workshop (Paris) gathered five tales from various regions, which feature animals as main characters.
Bernstein processes described by forward and backward heat equations
Mohamad Houda
Mathematics , 2013,
Abstract: We present some results on Bernstein processes which are Brownian diffusions that appear in Euclidean Quantum Mechanics: We express the distributions of these processes with the help of those of Bessel processes. We then determine two solutions of the dual equation of the heat equation with potential. This continues the calculation of Lescot for the solution with an Ornstein-Uhlenbek process .
Call option on the maximum of the interest rate in the one factor affine model
Mohamad Houda
Quantitative Finance , 2013,
Abstract: We determine an explicit formula for the Laplace transform of the price of an option on a maximal interest rate when the instantaneous rate satisfies Cox-Ingersoll-Ross's model. This generalizes considerably one result of Leblanc-Scaillet.
Analysis and Phylogeny of Small Heat Shock Proteins from Marine Viruses and Their Cyanobacteria Host
Halim Maaroufi, Robert M. Tanguay
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0081207
Abstract: Small heat shock proteins (sHSPs) are oligomeric stress proteins characterized by an α-crystallin domain (ACD) surrounded by a N-terminal arm and C-terminal extension. Publications on sHSPs have reported that they exist in prokaryotes and eukaryotes but, to our knowledge, not in viruses. Here we show that sHSPs are present in some cyanophages that infect the marine unicellular cyanobacteria, Synechococcus and Prochlorococcus. These phage sHSPs contain a conserved ACD flanked by a relatively conserved N-terminal arm and a short C-terminal extension with or without the conserved C-terminal anchoring module (CAM) L-X-I/V, suggested to be implicated in the oligomerization. In addition, cyanophage sHSPs have the signature pattern, P-P-[YF]-N-[ILV]-[IV]-x(9)-[EQ], in the predicted β2 and β3 strands of the ACD. Phylogenetically, cyanophage sHSPs form a monophyletic clade closer to bacterial class A sHSPs than to cyanobacterial sHSPs. Furthermore, three sHSPs from their cellular host, Synechococcus, are phylogenetically close to plants sHSPs. Implications of evolutionary relationships between the sHSPs of cyanophages, bacterial class A, cyanobacteria, and plants are discussed.
On the Optimal Pid Regulator for the Control of a Blower System
Houda Ben Jemaa Derbel
International Journal of Soft Computing , 2012,
Abstract: This study is devoted to the determination of an optimal PID regulator which minimizes the settling time of a blower system. Giving the high order of the mathematical model of such a system, the optimization of the regulator parameters is done by genetic algorithms. A discussion on the possibility of the existence of an overshoot is presented. Simulation results confirm the good performances of the implemented control system.
Tetrakis(3,5-xylidinium) dihydrogen cyclohexaphosphate dihydrate
Houda Marouani,Mohamed Rzaigui
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536809054452
Abstract: In the title compound, 4C8H12N+·H2P6O184 ·2H2O, the complete cyclohexaphosphate anion is generated by inversion symmetry. Crystal cohesion and stability are supported by electrostatic interactions which, together with N—H...O and O—H...O hydrogen bonds, build up a three-dimensional network.
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