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Search Results: 1 - 10 of 16830 matches for " AM El-Tawil "
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Different Prevalence of Chronic-Non-Infectious Diseases
AM El-Tawil
Iranian Journal of Public Health , 2010,
Abstract: "nInflammatory bowel disease, coronary artery disease, cerebrovascular disease, hypertension, diabetes, tumours, are exam-ples of chronic degenerative diseases that have a high prevalence in developed nations. These chronic-non-communicable dis-eases have multifactorial aetiologies that considered to be caused by the interaction of environmental risk factors with multi-ple predisposing genes. Genetic researches on these diseases have traditionally focused on investigation aimed at identify-ing disease-susceptibility genes. Recent evidence suggests that somatically acquired DNA mutations may also contrib-ute significantly to the pathogenesis of these disease states such as coronary artery disease indicating a similarity be-tween the atherosclerotic and carcinogenic processes. The high incidences and prevalence of these chronic diseases in the West-ern World in comparison with the East and changing trends in disease incidence (seen in many countries) provide strong evidence that those environmental factors as playing a major influence in disease- expression. There is an ample reason to be-lieve that environmental factors have contributed to inducing alterations in genetic code in precedent generations, which were subsequently inherited and further modified by modern life style activities. Consequently, we now see the appearance of chronic degenerative diseases and their higher incidences in the Western nations as compared with the Eastern ones.
Is the DHEAS/cortisol ratio a potential filter for non-operable constipated cases?
AM El-Tawil
World Journal of Gastroenterology , 2010,
Abstract: Constipation is a significant manifestation of a number of psychological disorders. Published papers recommend using self-assessment questionnaires for discriminating psychological from non-psychological constipated patients before operating on them but reports from major surveys revealed that general practitioners failed to diagnose 70% of depressed patients using self-assessment questionnaires. Lower circulating concentrations of progesterone, 17-hydroxyprogesterone, cortisol, testosterone, androstenedione, and dehydroepiandrostenedione sulfate (DHEAS) during the follicular phase in constipated young women compared with respective controls were found during the follicular phase of the menstrual cycles. During the luteal phase of the cycle, reductions were identified in estriol, cortisol and testosterone in the constipated group. Likewise, circulating concentrations of DHEAS were found to be lower in depressed patients than comparable healthy controls. DHEAS/cortisol ratios in morning serum and salivary samples were lower than those retrieved during other times of the day in depressed patients. The idea of recognizing major depression in constipated patients by measuring DHEAS/cortisol ratios in saliva and serum may be plausible but this possibility needs to be confirmed in well-designed studies.
Management of fistula-in-ano: An introduction
AM El-Tawil
World Journal of Gastroenterology , 2011, DOI: 10.3748/wjg.v17.i28.3271
Abstract: Peri-anal fistulae are a worldwide health problem that can affect any person anywhere. Surgical management of these fistulae is not free from risks. Recurrence and fecal incontinence are the most common complications after surgery. The cumulative personal surgical experience in managing cases with anal fistulae is significantly considered as necessary for obtaining better results with minimal adverse effects after surgery. The purpose for conducting this survey is to facilitate better outcome after surgical interventions in idiopathic anal fistulae’ cases.
Colorectal cancer and pollution
AM El-Tawil
World Journal of Gastroenterology , 2010,
Abstract: The incidence of colorectal carcinoma is increasing in young patients, in contrast to the well established wisdom that it is exclusively diagnosed in patients older than 40 years. In this survey, we examined all possible risk factors, and we recommend a number of measures for early detection in young patients who are at risk of developing this malignant tumor.
Solution of Stochastic Cubic and Quintic Nonlinear Diffusion Equation Using WHEP, Pickard and HPM Methods  [PDF]
Magdy A. El-Tawil, Aisha F. Fareed
Open Journal of Discrete Mathematics (OJDM) , 2011, DOI: 10.4236/ojdm.2011.11002
Abstract: In this paper, the cubic and quintic diffusion equation under stochastic non homogeneity is solved using Wiener- Hermite expansion and perturbation (WHEP) technique, Homotopy perturbation method (HPM) and Pickard approximation technique. The analytic solution of the linear case is obtained using Eigenfunction expansion .The Picard approximation method is used to introduce the first and second order approximate solution for the non linear case. The WHEP technique is also used to obtain approximate solution under different orders and different corrections. The Homotopy perturbation method (HPM) is also used to obtain some approximation orders for mean and variance. Using mathematica-5, the methods of solution are illustrated through figures, comparisons among different methods and some parametric studies.
Mean Square Numerical Methods for Initial Value Random Differential Equations  [PDF]
Magdy A. El-Tawil, Mohammed A. Sohaly
Open Journal of Discrete Mathematics (OJDM) , 2011, DOI: 10.4236/ojdm.2011.12009
Abstract: In this paper, the random Euler and random Runge-Kutta of the second order methods are used in solving random differential initial value problems of first order. The conditions of the mean square convergence of the numerical solutions are studied. The statistical properties of the numerical solutions are computed through numerical case studies.
Epidemiology and inflammatory bowel diseases
Ahmed Mahmoud El-Tawil
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v19.i10.1505
Abstract: The role of alcohol in causing or aggravating the pathogenesis of inflammatory bowel disease is unclear. For finding a conclusive answer for this valuable question we conducted this review. Only two studies were identified that successfully fulfilled our inclusive criteria. Usual consumption of alcohol reduced the risk compared with less frequent use (odds ratio = 0.57, 95%CI: 0.37-0.86). Light alcoholic drinking has protective effects against development of ulcerative colitis. But this inverse association disappeared when smoking was included.
Trends on gastrointestinal bleeding and mortality: Where are we standing?
Ahmed Mahmoud El-Tawil
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i11.1154
Abstract: Bleeding from the gastrointestinal tract and its management are associated with significant morbidity and mortality. The predisposing factors that led to the occurrence of these hemorrhagic instances are largely linked to the life style of the affected persons. Designing a new strategy aimed at educating the publics and improving their awareness of the problem could effectively help in eradicating this problem with no associated risks and in bringing the mortality rates down to almost zero.
On Perturbative Cubic Nonlinear Schrodinger Equations under Complex Nonhomogeneities and Complex Initial Conditions
Magdy A. El-Tawil,Maha A. El-Hazmy
International Journal of Differential Equations , 2009, DOI: 10.1155/2009/395894
Abstract: A perturbing nonlinear Schrodinger equation is studied under general complex nonhomogeneities and complex initial conditions for zero boundary conditions. The perturbation method together with the eigenfunction expansion and variational parameters methods are used to introduce an approximate solution for the perturbative nonlinear case for which a power series solution is proved to exist. Using Mathematica, the symbolic solution algorithm is tested through computing the possible approximations under truncation procedures. The method of solution is illustrated through case studies and figures.
Probabilistic Transformation Method in Reliability Analysis
Seifedine Kadry,Alaa Chateauneuf,Khaled El-Tawil
Journal of Engineering and Applied Sciences , 2012,
Abstract: In this study, a proposed technique is presented in order to evaluate the stochastic mechanical response. This technique is based on the combination of the probabilistic transformation methods and the deterministic Finite Element Method (FEM). The transformation technique evaluates the Probability Density Function (PDF) of the system output by multiplying the input PDF by the Jacobean of the inverse mechanical function. This approach has the advantage of giving directly the whole density function of the response -in closed form-, which is very helpful for reliability analysis.
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