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Search Results: 1 - 10 of 461731 matches for " Doha A. "
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Inter-Specific Biochemical Diversity between Echis pyramidum and Eryx colubrinus Inhabiting El-Faiyum, Egypt  [PDF]
Mohamed A. M. Kadry, Eman M. E. Mohallal, Doha M. M. Sleem, Mohamed A. S. Marie
Advances in Bioscience and Biotechnology (ABB) , 2015, DOI: 10.4236/abb.2015.68051
Abstract: Discontinuous polyacrylamide gel electrophoreses for lactate dehydrogenase (Ldh) and alfa-esterase (α-Est) isoenzymes were conducted for biochemical differentiation between Echis pyramidum and Eryx colubrinus inhabiting El-Faiyum, Egypt. Total lipids and total protein of liver and muscle tissues in both species were also analyzed. Three Ldh isoforms were recorded in both species and the activity and relative front (RF) of Ldh-1 seemed to be higher in E. pyramidum than in E. colubrinus. This high activity could be supported by the significant increase in the total lipids and total protein in liver and muscle tissues of this species. It is thus possibly reasonable to suppose that E. pyramidum is more active, energetic and adaptable in its habitat than E. colubrinus. α-Est showed five isozymic forms fractions in E. pyramidum, while it showed only four isoforms in E. colubrinus. α-Est-1 was the first clear, dense and thick isoform in E. pyramidum, but it was completely absent in E. colubrinus. High activity of the esterase isoform; α-Est-1 only in the heart tissue of E. pyramidum may reflect the high ability of E. pyramidum to be more resistant to the accumulated toxic residues in its body tissues than E. colubrinus.
Semantic Enrichment of XML Schema to Transform Association Relationships in ODL Schema  [PDF]
Doha Malki, Mohamed Bahaj
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.82008
Abstract: This paper presents an approach for transforming an XML schema we enriched in ODL (Object Definition Language) schemas. It is possible to realize the concepts of ODL in a model of XML schema, we propose to introduce an enrichment concretizing these concepts in the XML Schema models. We chose oriented object database as a target database because there are many common characteristics between XML and object-oriented model, thus the mapping from XML data into object-oriented databases is more interesting. Also the object-oriented data bases have become very widespread and acceptable and they offer an evolutionary approach, so we agree that it is time to develop a translation between XML and OO databases. The purpose of this article is to automate transformation process of an XML schema to an ODL database. Our work focuses on preserving semantics transformation of association relationships and we describe set of rules to create ODL classes from an enriched XML schema. The experimental study shows that the approach is feasible, and results are the same, the source database is transformed into target one without loss of data.
On the Derivatives of Bernstein Polynomials: An Application for the Solution of High Even-Order Differential Equations
E. H. Doha,A. H. Bhrawy,M. A. Saker
Boundary Value Problems , 2011, DOI: 10.1155/2011/829543
Abstract:
A Jacobi Dual-Petrov-Galerkin Method for Solving Some Odd-Order Ordinary Differential Equations
E. H. Doha,A. H. Bhrawy,R. M. Hafez
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/947230
Abstract: A Jacobi dual-Petrov-Galerkin (JDPG) method is introduced and used for solving fully integrated reformulations of third- and fifth-order ordinary differential equations (ODEs) with constant coefficients. The reformulated equation for the th order ODE involves -fold indefinite integrals for =1,…,. Extension of the JDPG for ODEs with polynomial coefficients is treated using the Jacobi-Gauss-Lobatto quadrature. Numerical results with comparisons are given to confirm the reliability of the proposed method for some constant and polynomial coefficients ODEs.
Hypolipidemic effect of vegetable and cereal dietary mixtures from Egyptian sources
Rashed, Magdy M.,Shallan, Magdy,Mohamed, Doha A.,Fouda, Karem
Grasas y Aceites , 2010, DOI: 10.3989/gya.111709
Abstract: Hyperlipidemia is a predominant risk factor for atherosclerosis and associated cardiovascular diseases (CVD). The international guidelines issued by the World Health Organization recommend a reduction in dietary saturated fat and cholesterol intake as a means to prevent hypercholesterolemia and CVD; however, only limited data are available on the benefits of vegetable consumption on CVD risk factors. The aim of this study was to prepare two powder mixtures containing vegetables and cereals and to evaluate their effect in hyperlipidemic rats. The first mixture was prepared from whole wheat, cabbage, parsley and pepper, while the second mixture was prepared from whole wheat, red beet root, parsley and pepper. Whole wheat was used as a source of dietary fiber, while cabbage and beetroot were used as sources of glucosinolates (GLS) and betalains respectively as well as dietary fiber. The chemical compositions of these mixtures were determined. The safety of these mixtures was also evaluated by examining liver and kidney functions. The chemical compositions of the powder mixtures revealed that mixtures (1) and (2) contain 19.1% and 13.3% protein, 2.1% and 2.5 % fat, 69.6% and 77.5% carbohydrates, 1.8% and 1.2% crude fibers, 7.4% and 5.5% ash and 18.3% and 16.8% dietary fibers respectively. Vitamin E was 7.4 and 4.5 mg/100g in mixtures (1) and (2) respectively. β-carotene was 830 and 786μg/100g in mixtures (1) and (2) respectively. Total phenolic compounds were 1910 and 1710 mg as gallic acid equivalents/100g in mixtures (1) and (2) respectively. The results of the animal experiment showed a non-significant reduction in final body weight and body weight gain in rats fed the control diet containing mixture (1) or (2) when compared with different groups. Rats fed the control diet containing mixture (1) or (2) showed a significant reduction in plasma total lipids, T-Ch, LDL-Ch, TG and the ratio of T-Ch /HDLCh in different degrees, while HDL-Ch increased significantly. The studied mixtures showed a hypolipidemic effect, which may be due to the presence of dietary fibers, plant protein, and phenolic compunds. La hiperlipidemia es un factor de riesgo predominante en la ateroesclerosis y enfermedades cardiovasculares asociadas (CVD). Las directrices Internacionales dictadas por la Organización Mundial de la Salud recomiendan una reducción en la ingesta de grasas saturadas y colesterol como medio para prevenir la hipercolesterolemia y las CVD; sin embargo, solamente hay un número limitado de datos disponibles sobre el beneficio del consumo de verduras en los factores
2-(3-Nitrophenoxy)quinoxaline
Noor Doha Hassan,Zanariah Abdullah,Hairul Anuar Tajuddin,Zainal A. Fairuz
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810034100
Abstract: In the title molecule, C14H9N3O3, the dihedral angle between the quinoxaline and benzene rings is 77.13 (9)°. The molecule is twisted about the ether–benzene O—C bond, with a C—O—C—C torsion angle of 102.8 (2)°. In the crystal, molecules are linked by C—H...O hydrogen bonds, forming layers in the ab plane, with one nitro O atom accepting two such interactions. The layers stack along the c-axis direction via weak C—H...π interactions.
Reduction in hypercholesterolemia and risk of cardiovascular diseases by mixtures of plant food extract: a study on plasma lipid profile, oxidative stress and testosterone in rats
Mohamed, Doha A.,Hamed, Thanaa E.,Al-Okbi, Sahar Y.
Grasas y Aceites , 2010, DOI: 10.3989/gya.021210
Abstract: The present study was postulated to prepare and evaluate the influence of two plant food extract mixtures on plasma lipid profile, oxidative stress and testosterone levels in rats fed a hypercholesterolemic diet. The safety of the studied extract mixtures was evaluated through the determination of liver and kidney functions. The total phenolic contents, tocopherols, fatty acids and unsaponifiable matter (UNSAP) in the extract mixtures were determined. Rats fed a hypercholesterolemic diet were given a daily oral dose (300 mg/kg rat body weight) of either mixture I or II for a month and compared with a control hypercholesterolemic group and a normal control group. Results showed that α-tocopherol was 0.750 and 4.017 mg, γ-tocopherol was 0.564 mg and 0 and δ-tocopherol was 15.23mg and 0.634mg/100g for mixtures I and II, respectively. The phenolic contents in mixtures I and II were 36.74 and 23.72 g gallic acid equivalent/100g mixture, respectively. The GLC investigation of UNSAP revealed that stigmasterol and b-sitosterol were the major phytosterols in mixtures I and II, respectively followed by campesterol in both. The GLC analysis of the fatty acids showed that oleic acid was the major fatty acid in both extract mixtures. Results from the animal experiment showed that feeding a hypercholesterolemic diet produced a significant increase in total lipids, total cholesterol (T-Ch), triglycerides (TGs), low density lipoprotein cholesterol (LDLCh), T-Ch/HDL-Ch, TGs/HDL-Ch and malondialdehyde (MDA) and a significant reduction in high density lipoprotein cholesterol (HDL-Ch), vitamin E, b-carotene and testosterone. Rats fed a hypercholesterolemic diet and given mixture I or II showed significant improvements in plasma lipid profile compared to the hypercholesterolemic control group. This improvement was associated with a significant reduction in oxidative stress reflected by an elevation in plasma levels of antioxidants (vitamin E and b-carotene) and a reduction in plasma MDA levels. The plasma level of testosterone increased significantly in the rats fed the hypercholesterolemic diet and given mixture I or II compared to the hypercholesterolemic control. Plasma testosterone showed a significant negative correlation with plasma TGs and TGs/HDL-Ch in the hypercholesterolemic control rats. The studied extract mixtures showed complete safety towards liver and kidney functions. In conclusion the tested extract mixtures showed an improvement in the plasma lipid profile, a significant increase in testosterone and a decrease in oxidative stress with promising prevention
Cognitive Power Control Under Correlated Fading and Primary-Link CSI
Doha Hamza,Mohammed Nafie
Mathematics , 2009,
Abstract: We consider the cognitive power control problem of maximizing the secondary throughput under an outage probability constraint on a constant-power constant-rate primary link. We assume a temporally correlated primary channel with two types of feedback: perfect delayed channel state information (CSI) and one-bit automatic repeat request (ARQ). We use channel correlation to enhance the primary and secondary throughput via exploiting the CSI feedback to predict the future primary channel gain. We provide a numerical solution for the power control optimization problem under delayed CSI. In order to make the solution tractable under ARQ-CSI, we re-formulate the cognitive power control problem as the maximization of the instantaneous weighted sum of primary and secondary throughput. We propose a greedy ARQ-CSI algorithm that is shown to achieve an average throughput comparable to that attained under the delayed-CSI algorithm, which we solve optimally.
Effect of mucin production on survival in colorectal cancer: A case-control study
Mirna H Farhat, Kassem A Barada, Ayman N Tawil, Doha M Itani, Hassan A Hatoum, Ali I Shamseddine
World Journal of Gastroenterology , 2008,
Abstract: AIM: To investigate the impact of mucin production on prognosis in colorectal cancer, in terms of overall survival (OS) and time to disease progression (TTP) in patients with mucinous compared to those with non-mucinous colorectal cancer (NMCRC), matched for age, gender, and tumor stage.METHODS: Thirty five patients with mucinous colorectal cancer (MCRC) were matched for age, gender, and tumor stage with 35 controls having NMCRC. OS and TTP were compared among 4 groups divided according to mucin content: group A (50%-75% mucin), group B (75%-100% mucin), group C or controls (< 50% mucin). Group D consisted of all patients with tumors having < 75% mucin (controls and groups A together).RESULTS: Median survival in MCRC and NMCRC groups was 46.2 and 112.9 mo, respectively (P = 0.26). OS in groups A and B was 70.1 and 32.8 mo (P = 0.46), and in groups B and D was 32.8 and 70.1 mo, respectively (P = 0.143). TTP in MCRC and NMCRC was 50.17 and 44.77 mo, respectively (P = 0.795). TTP in groups A, B, and D was 70.1, 24.8, and 65.5 mo, respectively. Twenty-eight percent of patients with MCRC had poorly differentiated adenocarcinoma versus 8.6% in NMCRC patients (P = 0.028).CONCLUSION: MCRC is associated with a non-significant decrease in median survival and TTP, particularly when mucin content is > 75% of tumor volume. However, it tends to be more poorly differentiated. A larger study matching for stage and grade is needed.
Non-invasive index of liver fibrosis induced by alcohol, thioacetamide and schistosomal infection in mice
Mohamed H Hessien, Ismaiel M El-Sharkawi, Ahmed A El-Barbary, Doha M El-Beltagy, Ned Snyder
BMC Gastroenterology , 2010, DOI: 10.1186/1471-230x-10-53
Abstract: Fibrosis was generated by thioacetamide (TAA), chronic intake of ethanol, or infection with S. mansoni in 240 mice. Both progression and regression of fibrosis (after treatment with silymarin and/or praziquantel) were monitored. The following methods were employed: (i) The METAVIR system was utilized to grade and stage liver inflammation and fibosis; (ii) Determination of hepatic hydroxyproline and collagen; and (iii) Derivation of a new hepatic fibrosis index from the induced changes, and its prospective validation in a group of 70 mice.The index is composed of 4 serum variable including total proteins, γ-GT, bilirubin and reduced glutathione (GSH), measured in diseased, treated and normal mice. These parameters were highly correlated with both the histological stage and the grade. They were combined in a logarithmic formula, which non-invasively scores the severity of liver fibrosis through a range (0 to 2), starting with healthy liver (corresponding to stage 0) to advanced fibrosis (corresponding stage 3).Receiver operating characteristic curves (ROC) for the accuracy of the index to predict the histological stages demonstrated that the areas under the curve (AUC) were 0.954, 0.979 and 0.99 for index values corresponding to histological stages 1, 2 and 3, respectively. Also, the index was correlated with stage and grade, (0.947 and 0.859, respectively). The cut off values that cover the range between stages 0-1, 1-2 and 2-3 are 0.4, 1.12 and 1.79, respectively. The results in the validation group confirmed the accuracy of the test. The AUROC was 0.869 and there was good correlation with the stage of fibrosis and grade of inflammation.The index fulfils the basic criteria of non-invasive marker of liver fibrosis since it is liver-specific, easy to implement, reliable, and inexpensive. It proved to be accurate in discriminating precirrhotic stages.The end stage complications of liver disease including cirrhosis, and portal hypertension are related to advanced fibros
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