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Search Results: 1 - 10 of 14041 matches for " Youssef El Fakir "
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A gallbladder tumor revealing metastatic clear cell renal carcinoma: report of case and review of literature
Merieme Ghaouti, Kaoutar Znati, Ahmed Jahid, Fouad Zouaidia, Zakiya Bernoussi, Youssef El Fakir, Najat Mahassini
Diagnostic Pathology , 2013, DOI: 10.1186/1746-1596-8-4
Abstract: The virtual slides’ for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/8956897238238989 webciteMetastatic tumors to the gallbladder are uncommon. The most common metastatic tumors to the gallbladder are metastatic melanomas and metastatic carcinomas from stomach, pancreas, ovary, bile ducts, colon and breast [1]. Metastatic renal cell carcinoma in the gallbladder is extremely rare, with reported frequencies of less than 0.6% in large autopsy reviews [2]. Renal cell carcinoma is a rare tumor accounting for 3% of all malignancies in adults and 85% of primary renal tumors. However, this tumor has a great propensity for metastasizing synchronously or metachronously to various anatomic sites [3]. We report a case of intraluminal polypoid metastasis of clear cell renal cell carcinoma in gallbladder mimicking gallbladder polyp and revealing the renal carcinoma and reviewed the reported 40 cases. The clinico-pathologic features and differential diagnosis are discussed.A 55-year-old woman presented with severe right hypochondrium pain, with weight loss and alteration of her general condition, lasting for 6 months. She showed no urological signs, especially no hematuria, no pain, and no flank mass. She had no past history in particular. Neither physical examination nor laboratory examination revealed any significant findings. Abdominal ultrasonography showed a 2.6 cm diameter intraluminal polypoid hyperechoic mass in the gallbladder. Color Doppler ultrasonography examination demonstrated vessels in the mid-portion of the mass. Computed tomography scan confirmed the presence of a gallbladder tumor that appeared as an enhancing pedunculated tumor within the gallbladder, without thickening of the gallbladder wall. The tumor seemed to be attached to the edge of the liver with no macroscopic extension to the liver parenchyma (Figure 1). Furthermore, TDM scan showed a cortical fleshy nodule of the right kidney, measuring 2.2 cm, with no involvement of
Post Traumatic Hemobilia: Three Case Reports  [PDF]
Hicham Jalal, Hana Elmansouri, Sofia El Fakir, Leila Berghalout, I. Zouita, Najat Cherif Idrissi El Ganouni, Youssef Narjiss, Khalid Rabbani
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105102
The authors report three cases of post-traumatic hemobilia. Hemobilia complicates about 0.5% to 2% of liver injuries. The diagnosis can be difficult because of its possible delay of appearance. The ultrasound and CT scan performed urgently are of great help in both positive diagnosis and monitoring of this pathology. Once the diagnosis is made—immediatly or a while after the trauma—a diagnostic and therapeutic arteriography must be carried out quickly.
Legionaires’ disease: Modalities, diagnosis and therapeutic
Bouchra Oumokhtar,Samira El Fakir
Technologies de Laboratoire , 2009,
Abstract: Infection with Legionella spp. is an important cause of community and hospital acquired pneumonia, occurring both sporadically and in outbreaks. The Legionaires’ disease affects primarily adults and more specifically fragile people such as elderly adult, patients affected by chronic respiratory diseases, diabetics and immunodeficient people. The contamination with legionellosis is mainly through respiratory tract, inhalation of contaminated water diffused in air. It is mainly transmitted by humidifying cooling systems and water network. The legionellosis is expressed by grip profile accompanied with fever and coughing. Others symptoms such as muscular pain, anorexia, digestive and neurological disorder might occur. The diagnosis of legionellosis is achieved by investigating the urinary antigen. But this test detects only Legionella pneumophila serogoup 1. The PCR allows fast diagnosis. However, this technique is not yet normalized. The legionellosis is mostly treated using suitable antibiotherapy. Macrolides and fluoroquinolones are the most widely used drugs in treatment.This review summarizes the available information regarding the microbiology, clinical presentation, diagnosis and treatment of Legionaires’ disease.
Study of Sodium-Chromium-Iron-Phosphate Glass by XRD, IR, Chemical Durability and SEM  [PDF]
Youssef Makhkhas, Said Aqdim, El Hassan Sayouty
Journal of Materials Science and Chemical Engineering (MSCE) , 2013, DOI: 10.4236/msce.2013.13001

Chromium iron phosphate glass was investigated for use as waste form because of its improved chemical durability. The introduction of chromium in sodium-iron-phosphate glass is used to compare its effect with iron in inhibition of corrosion. The sodium-chromium-iron phosphate glass of composition 10Na2O-30Fe2O3-5Cr2O3-55P2O5 (mol%) was produced by melting batches of (99, 98% pure) Cr2O3, Fe2O3, Na2CO3, and (NH4)2HPO4 at 1080°C for one hour and pouring the liquid into steel mold. The sample was annealed at 680°C for 48 h. We have performed the measurement of X-Ray Diffraction

Recognition of Tifinaghe Characters Using a Multilayer Neural Network
Rachid EL Ayachi,Mohamed Fakir,Belaid Bouikhalene
International Journal of Image Processing , 2011,
Abstract: In this paper, we present an off line Tifinaghe characters recognition system. Texts are scannedusing a flatbed scanner. Digitized text are normalised, noise is reduced using a median filter,baseline skew is corrected by the use of the Hough transform, and text is segmented into line andlines into words. Features are extracted using the Walsh Transformation. Finally characters arerecognized by a multilayer neural network.
A stochastic volatility model with jumps
Youssef El-Khatib
Mathematics , 2006,
Abstract: We consider a stochastic volatility model with jumps where the underlying asset price is driven by the process sum of a 2-dimensional Brownian motion and a 2-dimensional compensated Poisson process. The market is incomplete, resulting in infinitely many equivalent martingale measures. We find the set equivalent martingale measures, and we hedge by minimizing the variance using Malliavin calculus.
Computations of Greeks in stochastic volatility models via the Malliavin calculus
Youssef El-Khatib
Mathematics , 2009,
Abstract: We compute Greeks for stochastic volatility models driven by Brownian informations. We use the Malliavin method introduced for deterministic volatility models.
Low Cost Process for Phenolic Compounds Extraction from Cabernet Sauvignon Grapes (Vitis vinifera L. cv. Cabernet Sauvignon). Optimization by Response Surface Methodology  [PDF]
Youssef El Hajj, Nicolas Louka, Catherine Nguyen, Richard G. Maroun
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.31014
Abstract: Phenolic compounds are naturally extracted molecules used nowadays for several industrial applications such as food preservatives and neutraciticals; thus industrial needs are in constant growth. Optimization of phenolic compounds (PC) and monomeric anthocyanins (MA) extraction from grape berries using response surface methodology was here achieved. Cabernet Sauvignon (CS) wine grapes (Vitis vinifera L. cv. Cabernet Sauvignon) are a rich source of anti-radical phe- nols, extractable as dietary supplements. However, efficiency of extraction strongly depends on specific experimental conditions. In this work, the comparison between two extraction mixtures, Acetone/Water (A/W) and Methanol/Water (M/W) and the effects of three critical variables—Extraction Time (between 8 and 88 h), Extraction Temperature (between 1?C and 35?C) and Solvent Content (between 63% and 97%)—on Phenolic Compounds Yield (PCY) and Monomeric Anthocyanins Yield (MAY) were studied using Response Surface Methodology (RSM). Process conditions maximizing the PCY were found to be 87% A/W solvent content, after 88 h incubation at 26?C, and those of the MAY were found to be 97% M/W solvent content, after 8 h incubation at 1?C. In addition, chromatographic profiles of extracts showed very different affinities of the phenolic compounds families to the experimental conditions employed. This process advantages are: low percentage of organic solvent used, high quality of extracted molecules thanks to low temperature treatment, very low energy consumption and low cost of needed machinery. At industrial scale, it may be used as promising technique for the extraction of bioactive compounds from plant or byproduct material such as from wine or grape juice industries.
Privacy Preserving Scheme for Location-Based Services  [PDF]
Youssef Gahi, Mouhcine Guennoun, Zouhair Guennoun, Khalil El-Khatib
Journal of Information Security (JIS) , 2012, DOI: 10.4236/jis.2012.32013
Abstract: Homomorphic encryption schemes make it possible to perform arithmetic operations, like additions and multiplications, over encrypted values. This capability provides enhanced protection for data and offers new research directions, including blind data processing. Using homomorphic encryption schemes, a Location-Based Service (LBS) can process encrypted inputs to retrieve encrypted location-related information. The retrieved encrypted data can only be decrypted by the user who requested the data. The technology still faces two main challenges: the encountered processing time and the upper limit imposed on the allowed number of operations. However, the protection of users’ privacy achieved through this technology makes it attractive for more research and enhancing. In this paper we use homomorphic encryption schemes to build a fully secure system that allows users to benefit from location-based services while preserving the confidentiality and integrity of their data. Our novel system consists of search circuits that allow an executor (i.e. LBS server) to receive encrypted inputs/requests and then perform a blind search to retrieve encrypted records that match the selection criterion. A querier can send the user’s position and the service type he/she is looking for, in encrypted form, to a server and then the server would respond to the request without any knowledge of the contents of the request and the retrieved records. We further propose a prototype that improves the practicality of our system.
Using of In-Situ Mercury Film Sensor Hyphenated with Affinity Voltammetry for High Throughput Drug-Protein Binding Studies  [PDF]
Ahmed K. Youssef, Deia Abd El-Hady
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.44021

A new simple and reliable in-situ mercury film sensor coupled with affinity differential pulse stripping voltammetry (ADSPV) or affinity cyclic voltammetry (ACV) was investigated. The interaction of fenoprofen with bovine serum albumin (BSA) onto the proposed electrochemical sensor was studied. The nature of the electrochemical process of fenoprofen by cyclic voltammetry was depicted. Reproducibility of the proposed method was checked giving a precision of 0.073 standard deviation. The limit of detection and limit of quantification were 7.0 and 22.0 nmol/L, respectively. Fenoprofen was interacted with BSA by 1:1 stoichiometry to form electroinactive supramolecular complex. The binding constant was precisely estimated by non-linear regression analysis based on the shifting of analyte peak potentials. The proposed experiments and data analysis could be used to investigate the drug-protein binding constant within a short analysis time compared to other chromatographic techniques.

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