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Search Results: 1 - 10 of 18658 matches for " Moutaz Ali Agha "
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Gαo Is Required for L-Canavanine Detection in Drosophila
Isabelle Devambez, Moutaz Ali Agha, Christian Mitri, Jo?l Bockaert, Marie-Laure Parmentier, Frédéric Marion-Poll, Yves Grau, Laurent Soustelle
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0063484
Abstract: Taste is an essential sense for the survival of most organisms. In insects, taste is particularly important as it allows to detect and avoid ingesting many plant toxins, such as L-canavanine. We previously showed that L-canavanine is toxic for Drosophila melanogaster and that flies are able to detect this toxin in the food. L-canavanine is a ligand of DmXR, a variant G-protein coupled receptor (GPCR) belonging to the metabotropic glutamate receptor subfamily that is expressed in bitter-sensitive taste neurons of Drosophila. To transduce the signal intracellularly, GPCR activate heterotrimeric G proteins constituted of α, β and γ subunits. The aim of this study was to identify which Gα protein was required for L-canavanine detection in Drosophila. By using a pharmacological approach, we first demonstrated that DmXR has the best coupling with Gαo protein subtype. Then, by using genetic, behavioral assays and electrophysiology, we found that Gαo47A is required in bitter-sensitive taste neurons for L-canavanine sensitivity. In conclusion, our study revealed that Gαo47A plays a crucial role in L-canavanine detection.
Agent-Based Simulation for Real-Time Schedulers
Moutaz Saleh,Zulaiha Ali Othman
Research Journal of Applied Sciences , 2012,
Abstract: Since several years, communication networks have known a surprising growth. The increased number of users, the consequent increase of traffic and the request for new services involve the development of new technologies and the deployment of high throughput networks. Networking technology has correspondingly grown to meet the diverse needs of applications and network administration. In response to the complexity of communication networks, simulation was and remains the only way to evaluate network performance. Unfortunately, traditional simulation methods are not adapted to all networks such as networks with quality of service and networks with dynamic aspect. To overcome this limitation, a new method to simulate dynamic networks based on multi-agents simulation and behavioral approach had been proposed. In this study, we present an adaptive approach to schedule real-time network traffic using the agent based simulation concept. The study introduces an Adaptive Real-Time Agent Scheduler (ARTAS) architecture and agent model as basis for scheduling real-time packet networks.
Hierarchical Diff-EDF: An Agent Based Scheduler for Heterogeneous Real-Time Packet Networks
Moutaz Saleh,Zulaiha Ali Othman
International Journal of Soft Computing , 2012,
Abstract: Packet networks are currently enabling the integration of heterogeneous traffic with a wide range of characteristics that extend from video traffic with stringent QoS requirements to best-effort traffic requiring no guarantees. QoS guarantees can be provided in packet networks by the use of proper packet scheduling algorithms. Similar to the trends of computer revolution, many scheduling algorithms have been proposed to meet this goal. The First-Come-First-Served (FCFS), which is mostly used in conventional networks, has been widely adopted for best-effort traffic. In addition, many scheduling algorithms have also been proposed to provide different schemes of QoS guarantees. Among which include the Earliest Deadline First (EDF) and the Differentiated-EDF (Diff-EDF). In this study, we propose a new priority assignment scheduling algorithm, Hierarchical Diff-EDF, which can meet the real-time needs while continuing to provide best effort service over heterogeneous real-time network traffic. The Hierarchical Diff-EDF service meets the flow miss rate requirements through the combination of single step hierarchal scheduling for the different network flows (video, audio and text) and the admission control mechanism that detects the overload conditions to modify packets` priorities. The implementation of this scheduler is based on the multi-agent simulation that takes the inspiration from object-oriented programming. The implementation itself is aimed to the construction of a set of elements which, when fully elaborated, define an agent system specification. When evaluating our proposed scheduler, it was extremely obvious that the Hierarchical Diff-EDF scheduler performs much better than both EDF and Diff-EDF schedulers.
The Heat Treatment Effect on the Oxidation Rate of the Ge-Doped Si(100)  [PDF]
Bashir Nedaee Shakarab, Ali Baghizadeh, Davoud Agha-Ali Gol
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31015

In this paper, the Si(100) substrate was implanted by Ge ions at different doses to study the effect of the preliminary heat treatment on the wet oxidized layer of the Si using Rutherford Backscattering Spectroscopy and Atomic Force Microscopy. We found that the change of the silicon oxide thickness and its morphology under the influence of the Ge dopant is mostly dependent on the damaged surface layer of the Si substrate after ion implantation. By choosing different doses of the implantation and subsequent annealing process, we tried to get different level of the induced damage, enabled us to investigate the role of the pre-heating and subsequent recrystalization of the damaged substrate on the silicon oxidation process under the effect of the implanted Ge ions. By the determination of the effect of these parameters, we can better identify the optimal conditions of getting the oxide layer with proper thickness and morphology.

Self organized criticality in a sandpile model with threshold dissipation
Agha Afsar Ali
Physics , 1995,
Abstract: We study a nonconservative sandpile model in one dimension, in which, if the height at any site exceeds a threshold value, the site topples by transferring one particle along each bond connecting it to its neighbours. Its height is then set to one, irrespective of the initial value. The model shows nontrivial critical behavior. We solve this model analytically in one dimension for all driving rates. We calculate all the two point correlation functions in this model, and find that the average local height decreases as inverse of the distance from the nearest boundary and the power spectrum of fluctuations of the total mass varies as $1/f$.
Cooperative behavior in a spatial model of "commons"
Agha Afsar Ali
Physics , 2002,
Abstract: We study a lattice model of ``commons'', where a resource is shared locally among the agents of various cooperative tendency. The payoff function of an agent is proportional to the fraction of his operation rate and the net output of the resource. After each time step a site is occupied by the neighbor of maximum profit or by its owner himself. In steady state the model is dominated by ``altruist'' agents with a small minority of selfish agents, forming a complex pattern. The dynamics selects cooperative levels in a way that the model becomes critical. We study the critical behavior of the model in case of moderate mutation rate and find the power spectrum of fluctuation of activity shows a $1/f^\alpha$ behavior with $\alpha \sim 1.30$. In case of very slow mutation rate the steady state has slow fluctuations which helps the evolution of higher cooperative tendency.
Breakdown of Simple Scaling in Abelian Sandpile Models in One Dimension
Agha Afsar Ali,Deepak Dhar
Physics , 1994, DOI: 10.1103/PhysRevE.51.R2705
Abstract: We study the abelian sandpile model on decorated one dimensional chains. We determine the structure and the asymptotic form of distribution of avalanche-sizes in these models, and show that these differ qualitatively from the behavior on a simple linear chain. We find that the probability distribution of the total number of topplings $s$ on a finite system of size $L$ is not described by a simple finite size scaling form, but by a linear combination of two simple scaling forms $Prob_L(s) = 1/L f_1(s/L) + 1/L^2 f_2(s/L^2)$, for large $L$, where $f_1$ and $f_2$ are some scaling functions of one argument.
Physicochemical, Heavy Metals and Phenolic Compounds Analysis of Libyan Honey Samples Collected from Benghazi during 2009-2010  [PDF]
Mohamed H. S. Ahmida, Saleh Elwerfali, Ali Agha, Mohamed Elagori, Nagwa H. S. Ahmida
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.41006
Abstract: In the present work, the results of analysis of 10 Libyan honey samples, representing various floral honeys, collected from Benghazicity during different seasons in 2009-2010 were demonstrated. All samples were examined for the physicochemical quality parameters, phenolic compounds and heavy metals contents. The moisture; optical density (O. D.); electrical conductivity; water insoluble solids; ash content; pH; total acidity; hydroxylmethyl furfural (HMF); sugar contents and phenolic compounds content were detected according to AOAC 1990-Official Methods and reference methods. The results were compared with Libyan Standard Legislation and the European Standard Legislation. The obtained results indicated that the quality of the tested Libyan honey samples were very good and worth to the world standard properties of honey. Even more, the tested Libyan honey samples have high level of phenolic compounds content. On the basis of heavy metals content, three metals were determined (Cadmium, copper and lead) using atomic absorption spectrophotometer. The level of each metal-content was variable, which may be due to the conditions of processing, packing and storage conditions of Libyan honey samples.
The Professional Medical Journal , 2010,
Abstract: Objective: To determine what surgical techniques are used by obstetricians in Pakistan for caesarean section operations and tocompare it with the recommendation, proposal and guidelines of Royal College of Obstetrician and Gynecologist (RCOG) and CochraneReviews. Methods: A questionnaire was set up regarding surgical technique used during caesarean section and one hundred obstetricianswere part of study. Setting: Hospitals in two large cities of Pakistan i.e. Karachi and Rawalpindi were requested to fill them. Period: Jan 2009 to June 2009. Result: Substantial and remarkable and difference noted in the practice of caesarean section among the obstetricians. Certain practices and procedures performed by our obstetrician are same as proved to be beneficial and valuable based on evidence andrecommended by the RCOG and Cochrane Data on pregnancy. Conclusion: We observed that our obstetricians follow different surgical techniques for performing caesarean section. Some of the techniques follow recommendations by RCOG and provide to effective and beneficial by cochrane data.
An Underwater Wireless Sensor Network with Realistic Radio Frequency Path Loss Model
Ghaith Hattab,Mohamed El-Tarhuni,Moutaz Al-Ali,Tarek Joudeh
International Journal of Distributed Sensor Networks , 2013, DOI: 10.1155/2013/508708
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