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Search Results: 1 - 10 of 401240 matches for " M. M. Shehata "
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A Study of Some Nonlinear Partial Differential Equations by Using Adomian Decomposition Method and Variational Iteration Method  [PDF]
Marha M. Shehata
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.52016
Abstract: In this paper, a numerical solution of nonlinear partial differential equation, Benjamin-Bona-Mahony (BBM) and Cahn-Hilliard equation is presented by using Adomain Decomposition Method (ADM) and Variational Iteration Method (VIM). The results reveal that the two methods are very effective, simple and very close to the exact solution.
The exp(-j(x)) Method and Its Applications for Solving Some Nonlinear Evolution Equations in Mathematical Physics  [PDF]
Maha S. M. Shehata
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.54041
Abstract:

The ?exp(-j(x))?method is employed to find the exact traveling wave solutions involving parameters for nonlinear evolution equations. When these parameters are taken to be special values, the solitary wave solutions are derived from the exact traveling wave solutions. It is shown that the ?exp(-j(x))??method provides an effective and a more powerful mathematical tool for solving nonlinear evolution equations in mathematical physics. Comparison between our results and the well-known results will be presented.

Pathogenesis of cardiac graft failure in children  [PDF]
Jenny Lin, Bahig M. Shehata
Open Journal of Pediatrics (OJPed) , 2012, DOI: 10.4236/ojped.2012.24051
Abstract: For many critical cardiac conditions such as cardio-myopathy, congenital heart defects, or arrhythmogenic disorders, cardiac transplantation is often an accepted treatment with optimistic one- and five-year survival rates of 90% and 75% in the pediatric patient population, respectively. However, poor long-term survival is a cause for concern, with cardiac graft failure being the leading cause in late mortality transplant recipients. Cardiac graft failure occurs through several mechanisms. However, the most common causes include cardiac allograft vasculopathy, myocardial fibrosis, and fibrofatty changes. Risk factors exacerbate these mechanisms through rejection, immunosuppressive drug side effects, hypertension, diabetes mellitus, renal dysfunction, and viral infection to increase the chance of cardiac graft failure. Changes in expression levels of various genes offer diagnostic potential for the future of cardiac transplantation. Through a comprehensive review of how multiple factors can lead a cardiac graft into failure, we hope to contribute to the longevity of cardiac grafts and pediatric heart transplant recipients.
An Integral Collocation Approach Based on Legendre Polynomials for Solving Riccati, Logistic and Delay Differential Equations  [PDF]
M. M. Khader, A. M. S. Mahdy, M. M. Shehata
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.515228
Abstract:

In this paper, we propose and analyze some schemes of the integral collocation formulation based on Legendre polynomials. We implement these formulae to solve numerically Riccati, Logistic and delay differential equations with variable coefficients. The properties of the Legendre polynomials are used to reduce the proposed problems to the solution of non-linear system of algebraic equations using Newton iteration method. We give numerical results to satisfy the accuracy and the applicability of the proposed schemes.

The Roles of Seed Proteins and RAPD-PCR in Genotyping Variabilities of Some Wheat (Triticum vulgare L.) Cultivars
Maher M. Shehata
Pakistan Journal of Biological Sciences , 2004,
Abstract: Traditional identification of wheat cultivars relies on the assessment of agronomic traits of the adult plant. This leads to a significant delay of time, constraints to breeders in the surveillance of germplasm and a risk for growers and exporters. Seed storage protein and DNA fingerprinting diversity as revealed by variation in SDS-PAGE and RAPD-PCR, respectively has been used to reassess the genotypic differences, relationships and discriminating between eight wheat (Triticum vulgare L.) cultivars (Banisewef 3, Gemmiza 7, Giza 164 and 168, Sakha 8, 69 and 93 and Sids 1) grown in Egypt. A total number of 46 protein bands, with molecular weight ranging between 160.52 and 3.86 kDa were recorded in the electrophenograms of the cultivars studied. SDS-PAGE profiles showed slight differences at high and low molecular weights and high differences at mid molecular weights. The highest number of bands (30) was recorded in Banisewef 3 and the lowest number (21) was recorded in Sids 1. Eight common bands (M.wts.; 155.32, 139.50, 76.35, 29.25, 19.25, 8.20, 7.20 and 6.38 kDa) were recorded in all samples. Six unique bands were recorded in cultivars Banisewef 3 (M.wts: 132.69 and 73.50 kDa), Sakha 8 (M.wt.: 38.50 kDa) and Sakha 69 (M.wts.: 88.59, 63.20 and 24.85 kDa). In the RAPD-PCR analysis twenty five random decamer (10 mer) primers were screened, but only eight primers (OPB-01, -02, -03, -08 and OPI-03, -09, -14 and -18) were able to generate distinguishable, reproducible and repeatable informative products among the DNA samples of the studied genotypes. A total of 67 polymorphic bands out of 86 ones were generated by the eight primers. Nearly every cultivar has a different DNA fingerprint. Each cultivar has one or more novel sequences not found in other cultivars. These bands may be used as genetic markers for identification of these cultivars using the same primer. A total of 8 polymorphic bands were scored as unique ones. Primers OPI-09 and -03 were found to be the most effective in generating unique bands. The former primer generated 4 unique bands in Banisewef and Giza 164 cultivars while the latter primer produced 2 unique bands in Giza 169 and Sakha 93 cultivars. Increasing and changing the number of cycles in PCR from 30 to 40, improve our results. These bands were used as binary characters and analyzed by the NTSYS-pc. Program Package using the UPGMA clustering method. This analysis indicates that, the eight cultivars are distinct. SDS-PAGE and RAPD-PCR data were combined together and used to construct a dendrogram that estimates the relationship and the
Accumulation of Osmolytes and Stress Proteins, Alteration of Levels of Gene Expressions and DNA Profiles in Two Wheat Cultivars as a Response to Amelioration of pH Stress by IAA
Maher M. Shehata
Biotechnology , 2005,
Abstract: Grains of two wheat (Triticum vulgare L.) cultivars (Gemmiza 7 and Giza 164) previously presoaked in phosphate buffer at different pHs, as well as an optimum concentration of IAA, were sown and grown at the green house to the M2 grains in order to study the possible adaptive mechanisms to ameliorate the pH stress on osmolytes (proline and betaine as chemical chaperones), stress proteins (molecular chaperones), alteration of levels of gene expression (mRNA and proteins) and DNA profiles. The results revealed that plants under acidic pH have an obvious effect on total proteins, RNA and DNA macromolecules. Cultivar Giza 164 plants accumulated higher levels of proline than Gemmiza 7 under pH stress. In both cultivars betaine and the level of mRNA increased with pH stress and the expression was coincided with the observed betaine accumulation. The yields of poly(A)+ RNA were in the range of 0.5-1.5% 1 in Cv. Giza 164 as compared to that of Gemmiza 7 (0.3-1.1% 0.7). Exogenous application of IAA can stimulate resistance against the unfavourable environmental pH value and improve plant under stress by developing various mechanisms, which include increase in both the soluble protein, betaine and proline that acts as a free radical scavenger and limits the cytoplasmic acidification, quantitative and qualitative increase in mRNA and low molecular weight proteins (9-29 kDa) that play an important role in the readjustment of plant cell`s osmotic potential and protecting cytoplasmic enzymes. RAPD analysis was effective in detecting informative qualitative and quantitative changes in both wheat cultivars as a response to pH stress and hormonal application. The thirty used different primers have different performances in detection of genetic changes. The number of amplified fragments generated ranges between 10 and 22 with molecular size ranges between 50 and 2130 bp. Quantitative changes by one common band were shown in stressed Giza 164 samples using thirteen primers as compared to nine primers in Gemmiza 7 stressed samples. Qualitative changes were recorded using all primers (thirty) in Gemmiza 7 and in Giza 164 using sixteen primers only. These changes were found to be reproducible when repeated at different times under the same amplification conditions. The expression of many proteins is known to be regulated by biotic and abiotic stresses, suggesting the occurrence of complex mechanisms that control gene expression in response to environmental stresses. The disappearance of some protein bands may be attributed to the alteration of their structural genes and RNA t
On stability in dynamical Prisoner's dilemma game with non-uniform interaction rates
M. I. Shehata
Quantitative Biology , 2011,
Abstract: Stability of evolutionary dynamics of non-repeated Prisoner's Dilemma game with non-uniform interaction rates [1], via benefit and cost dilemma is studied . Moreover, the stability condition (b+c/b-c)2 < r1r3 is derived in case of coexistence between cooperators and defectors .If r1,r3 -> infinity cooperation is the dominant strategy and defectors can no longer exploit cooperators.
Preparation and Characteristics of Cu-Al2O3 Nanocomposite  [PDF]
F. Shehata, M. Abdelhameed, A. Fathy, M. Elmahdy
Open Journal of Metal (OJMetal) , 2011, DOI: 10.4236/ojmetal.2011.12004
Abstract: Thermo-chemical technique was used to synthesize Cu-Al2O3, nanocomposite powders. The process was carried out by addition of Cu powder to aqueous solution of aluminum nitrate. Afterwards, a thermal treatment at 850℃ for 1 hr was conducted to get insitu powders of CuO and stable alumina (Al2O3, ). The CuO was reduced in hydrogen atmosphere into copper powder. The nanocomposite powders of both copper and alumina were thoroughly mixed, cold pressed into briquettes and sintered at 850℃ in hydrogen atmosphere. The x-ray diffraction and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS) were used to characterize the structure of the obtained powders. The results showed that alumina nanoparticles (20 nm) and ultra fine copper crystallite (200 nm) were obtained. SEM and EDS showed that the alumina particles were uniformly dispersed within the copper crystallite matrix. The structure also revealed formation of a third phase (CuAlO2) at copper-alumina interface. The hardness and density results showed that the gain in hardness was found to be dependent on the alumina contents rather than on the relative densities. The alumina content up to 12.5% resulted in an increase of 47.9% in hardness and slight decrease (7.6%) in relative densities. The results of compression tests showed considerable increase in compression strength (67%) as alumina content increased up to 12.5%. The compression strength showed further increase in compression strength (24%) as strain rates were increased from 10-4 s to 10s. Strain hardening and strain rate parameters “n” and “m” have shown positive values that improved the total strain and they can be used to predict formability of the nanocomposite.
The Effects of Using Color Foods of Children on Immunity Properties and Liver, Kidney on Rats  [PDF]
Sahar S. A. Soltan, Manal M. E. M. Shehata
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.37119
Abstract: Synthetic color is added to foods to replace natural color lost during processing. It is causes health problems mainly in children that considered Avery venerable group. This study was carried out investigate the effect of using color foods (Color fruit juice for 6 - 12 hr. Tomato ketchup potato chips (TKPC) color sweet and color chocolate at low (15%) and high (30%)) concentration on serum biochemical, WBC (white blood cell)and histopathology of liver and kidney of rats for 13 week. The results indicated that no significant change in body weight gain, serum glucose, HDL and LDL cholesterol. TKPC (30%) showed that significant increase in total cholesterol (TC), triacylglycerol (TG). Low and high concentration of color chocolate and color sweet was exhibited significant increase of TG. The level of ALT and AST was significant increase of rat’s administration color fruit juice (for 12 hr.) and TKPC at 30%. High concentration of color foods and long time administration of color fruit juice showed significant increase in serum creatinine and albumin compared to control group. Both low and high consumed of color foods exhibited significant decrease in liver GSH. High concentration of color foods lead to increase number of WBC as the result to the response of the immune system to the inflammation. Color foods were reveled change in histological structure of liver and kidney. In conclusion, the use synthetic color in various foods has adverse effect on some of biochemical analysis; and the liver and kidney histopathological structure.
Stability and Feedback Stabilization of HIV Infection Model with Two Classes of Target Cells
A. M. Elaiw,A. M. Shehata
Discrete Dynamics in Nature and Society , 2012, DOI: 10.1155/2012/963864
Abstract: We study the stability and feedback stabilization of the uninfected steady state of a human immunodeficiency virus (HIV) infection model. The model is a 6-dimensional nonlinear ODEs that describes the interaction of the HIV with two classes of target cells, CD4
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