oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

9 ( 1 )

2019 ( 29 )

2018 ( 192 )

2017 ( 166 )

Custom range...

Search Results: 1 - 10 of 10129 matches for " Mohamed Magdy Fahim Mansour "
All listed articles are free for downloading (OA Articles)
Page 1 /10129
Display every page Item
Effect of heavy metals on plasma membrane lipids and antioxidant enzymes of Zygophyllum species
Amal Ahmed Morsy,Karima Hamid Ali Salama,Hend Ahmed Kamel,Mohamed Magdy Fahim Mansour
EurAsian Journal of Biosciences , 2012,
Abstract: Background: Heavy metals are major environmental pollutant when they present in high concentration in soil and have toxic effects on growth and development of plants. Industrial activities result in heavy metal pollution of large areas of land, which greatly affects natural vegetation. Understanding the mechanism of how plants combat heavy metals adverse effects is hence of great importance.Materials and Methods: Two different localities were chosen; one locality was in the vicinity of gypsum factory and the other one was 25 km away from the factory. Two Zygophyllum species (Z.album and Z. coccineum) were naturally grown in the studied areas. The effects of soil heavy metal stress on shoot heavy metal concentrations, lipid peroxidation, antioxidant enzyme activities and the root plasma membrane (PM) lipid composition were analyzed.Results: Heavy metal concentrations and Lipid peroxidation increased in the shoot of both species grown in the polluted area. The activities of ascorbate oxidase (ASO), guaiacal peroxidase (GPX),ascorbate peroxidase (APX) and superoxide dismutase (SOD) were increased whereas these of catalase (CAT) were decreased in both species under the polluted conditions. PM total lipids,phospholipids, glycolipids and sterols were decreased in Z. album and Z. coccineum as a result of the polluted soil. Heavy metal stress increased phosphatidylethanolamine (PE) and decreasedphosphatidylinositol (PI) and phophatidylglycerol (PG), with no significant change in phosphatidylcholine (PC) in the root PM of both species. Phosphatidylserine (PS) decreased in the PM of Z. album whereas it increased in the PM of Z. coccineum under the pollution conditions. Heavy metal stress changed the composition and concentration of fatty acids of the root PM, resulting inincreased sat/unsat ratio of both species.Conclusion: the results suggest that efficient antioxidant machinery and favorable PM lipid homeostasis are important to enable Zygophyllum species to withstand the prevailing heavy metalstress.
Numerical Solution of Nonlinear System of Partial Differential Equations by the Laplace Decomposition Method and the Pade Approximation  [PDF]
Magdy Ahmed Mohamed, Mohamed Shibl Torky
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.33026
Abstract:
In this paper, Laplace decomposition method (LDM) and Pade approximant are employed to find approximate solutions for the Whitham-Broer-Kaup shallow water model, the coupled nonlinear reaction diffusion equations and the system of Hirota-Satsuma coupled KdV. In addition, the results obtained from Laplace decomposition method (LDM) and Pade approximant are compared with corresponding exact analytical solutions.

Synthesis and Biological Activity of Drug Delivery System Based on Chitosan Nanocapsules  [PDF]
Mohamed Gouda, Usama Elayaan, Magdy M. Youssef
Advances in Nanoparticles (ANP) , 2014, DOI: 10.4236/anp.2014.34019
Abstract: Chitosan nanocapsules containing naproxen as an active ingredient were synthesized by ionic gelation method in presence of polyanion tripolyphosphate as a crosslinker. The morphology and diameter of the prepared chitosan nanoparticles was characterized using scanning electron microscopy and transition electron microscopy. Different factors affecting on the size diameter of chitosan nanoparticles such as stirring time and temperature, pH values as well as chitosan concentration were studied. Different factors affecting on the immobilization of naproxen into chitosan nanoparticles such as time, temperature and pH values were optimized. Synthesized naproxen/chitosan nanocapsules were assessed against both Gram positive bacterial strain such as Bacillus subtilis and Staphylococcus aureus and Gram negative bacterial strain such as Pseudomonas aeruginosa and Escherichia coli. Also, the antifungal activity of the naproxen/chitosan nanocapsules against Saccharomyces cerevisiae was demonstrated. Super oxide dismutase like activity of naproxen/chitosan nanocapsules will be determined.
Optimal Scheme with Load Forecasting for Demand Side Management (DSM) in Residential Areas  [PDF]
Mohamed AboGaleela, Magdy El-Marsafawy, Mohamed El-Sobki
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B171
Abstract:

Utilities around the world have been considering Demand Side Management (DSM) in their strategic planning. The costs of constructing and operating a new capacity generation unit are increasing everyday as well as Transmission and distribution and land issues for new generation plants, which force the utilities to search for another alternatives without any additional constraints on customers comfort level or quality of delivered product. De can be defined as the selection, planning, and implementation of measures intended to have an influence on the demand or customer-side of the electric meter, either caused directly or stimulated indirectly by the utility. DSM programs are peak clipping, Valley filling, Load shifting, Load building, energy conservation and flexible load shape. The main Target of this paper is to show the relation between DSM and Load Forecasting. Moreover, it highlights on the effect of applying DSM on Forecasted demands and how this affects the planning strategies for utility companies. This target will be clearly illustrated through applying the developed algorithm in this paper on an existing residential compound in Cairo-Egypt.

Cloning and Characterization of New emm Allele of Streprococcus pyogenes Strains Isolated in Kingdom of Saudi Arabia
Magdy M. Mohamed
Pakistan Journal of Biological Sciences , 2006,
Abstract: In the present study, 39 isolates of erythromycin-resistant group A Streptococcus (GAS) isolated in the kingdom of Saudi Arabia from 2003 to 2004 were characterized by using phenotypic and genotypic methods. Most strains (94.9%) had similar or highly related pulsed-field gel electrophoresis profiles to different nine emm types previously documented. In which, type emm1 was the most prevalent M type in KSA representing 20.5% of total isolates, followed by emm3 (15.4%) typing. Two new emm sequence types were identified among GAS strains designated SA15 and SA37. The type SA15 carried two resistant mefA and ermTR genes accounted for 6.3% (1/16) and 50.0% (1/2), respectively. Entire fragment of SA15 was sequenced and expressed in expression vector to be used as a tool for vaccine preparation in this area. This report provides information on new emm sequence types firstly detected in KSA GAS isolates as a vaccine candidate antigen in this geographic area which not extensively surveyed, also it contributes to a better understanding of the local and global dynamics of GAS populations and the epidemiological aspects of GAS infections occurring in KSA.
Molecular Characterization and Immunogentic Properties of a Group 3 Membrane Protein Isolated from B. abortus Infection
Magdy M. Mohamed
Journal of Biological Sciences , 2007,
Abstract: This study was conducted to evaluate the immunogenicity and protective efficacy of B. abortus protein antigen. A gene that encode 0.85 kbp was isolated from B. abortus genome λgt11 expression library by probing with a Polled Human Abs (PHAbs) infected with B. abortus or B. melitensis. Sequence analysis of the cloned gene revealed the presence of an Open Reading Frame (ORF) of 259 amino acids encoding for a protein with calculated molecular weight of 23 kDa (Bp23). The predicted amino acid sequences of this gene shows 83% similarity with B. abortus outer membrane 26 kDa protein (Omp26) previously sequenced. The recombinant B. abortus protein was identified by human sera infected with either B. abortus or B. melitensis, but not healthy persons as shown by Western blotting. Therefore, the availability of this recombinant protein and the identification of the antigenic determinant recognized by human Ab will allow the evaluation of its potential protective activity for the development of subcellular vaccines against brucellosis. Moreover, the use of this recombinant protein in Western blotting allowed differentiation between vaccinated from naturally infected camels. Hyperimmune rabbit serum against Bp23 recombinant protein could detect naturally infected animals with different specificities, whereas represented in camels (100%), cows (54%) and sheep (33%), but not detected at all in brucellosis free camels. These data indicated that the new isolated Bp23 recombinant protein might be of value as a vaccine candidate for treatment of human brucellosis and as an antigen for serological diagnosis of brucellosis in different animals as well.
Synthesis and characterization of new chromeno[2,3-b]pyridines via the Friedl nder reactions of 8-allyl-2-amino-4-oxo-4H-chromene-3-carboxaldehyde
Magdy Ahmed Mohamed Ibrahim
European Journal of Chemistry , 2010, DOI: 10.5155/eurjchem.1.2.124-128.75
Abstract: New series of chromeno[2,3-b]pyridines, 2-8, have been obtained from 1,8-diazabicyclo [5.4.0]undec-7-ene catalyzed Friedl nder reaction of 8-allyl-2-aminochromone-3-carboxaldehyde (1) with some carbonyl compounds containing a reactive α-methyl or methylene group namely 2-acetylthiophene, 3-acetylpyridine, 4-chloroacetophenone, 4,6-diacetylresorcinol, acetylacetone, dibenzoyl methane and acetoacetanilide. Heteroannulated chromones, 13-16, were prepared from Friedl nder reaction of 1 with some cyclic α-methylene ketones namely 2-phenyliminothiazolidin-4-one, pyrazoline-3,5-dione, 5,5-dimethylcyclohexane-1,3-dione and thiobarbituric acid. Structures of the newly synthesized compounds have been established from elemental analysis and spectroscopic data.
The relationship between Test Takers’ Multiple Intelligences and Their Performance on the Reading Sections of TOEFL and IELTS
Mansour Fahim,Marzieh Bagherkazemi,Minoo Alemi
Brain. Broad Research in Artificial Intelligence and Neuroscience , 2010,
Abstract: The present study aimed at investigating the hypothetical relationship between the multiple intelligences of test takers and their performance on the reading sections of TOEFL and IELTS. Howard Gardner’s theory of multiple intelligences suggests that intelligence is not a single and solely inborn capacity, rather a multiple construct which is only partly genetic, and can be crystallized or paralyzed over one’s lifetime. Based on the theory, there are eight types of intelligence: linguistic, mathematical, musical, bodily, spatial, intrapersonal, interpersonal and naturalist, but the list is not exhaustive. The multiple intelligences of test takers were estimated by means of MIDAS, the Multiple Intelligences Developmental Assessment Scales, developed by Shearer (1994). Subsequently, the bias detection for the reading section of TOEFL was carried out on 90 participants, and this subtest was found to correlate positively with linguistic and logical intelligences. By the same token, 89 out of the 163 participants in the study were included in the analysis of the relationship between the multiple intelligences of test takers and their performance on the reading section of IELTS, and this test proved biased toward linguistic and spatial intelligences. The implications concern the inadequacy of the definition of language proficiency .Moreover, Measurement-Driven Instruction courses and preparatory materials of the two proficiency tests, TOEFL and IELTS, can benefit from the results of the study by being designed in such a way as to represent the intelligences which are positively correlated with performance on the tests in question.
Effects of drip irrigation circuit design and lateral line lengths: I—On pressure and friction loss  [PDF]
Mohamed Tayel, David Lightfoot, Hani Mansour
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.33046
Abstract: Laboratory tests were conducted at the Irrigation Devices and Equipment’s Test Laboratory, Agricultural Engineering Research Institute, Agriculture Research Center, Giza, Egypt. The experimental design of laboratory experiments was split in randomized complete block design with three replicates. Laboratory tests carried out on three irrigation lateral lines of 40, 60, 80 m under the following three drip irrigation circuit (DIC) designs; 1) one manifold for lateral lines or closed circuits with one manifold of drip irrigation system (CM1DIS); 2) closed circuits with two manifolds for lateral lines (CM2DIS), and 3) traditional drip irrigation system (TDIS) as a control. The aims of the work were to study the effect of drip irrigation circuits (DIC) and lateral lines lengths (LLL; where): (LLL1 = 40 m, LLL2 = 60 m, and LLL3 = 80 m) on pressure head (PH) and friction loss (FL). Regarding to LLL and according to PH values, DIC designs could be ranked in the following ascending order: TDIS < CM1DIS < CM2DIS. The differences in PH among DIC designs were significant at the 1% level. The depressive effects of LLL on PH could be ranked in the following ascending order: LLL1 < LLL2 ≤ LLL3. Differences in PH among LLL treatments were significant at the 1% level except that between LLL2 and LLL3. The effects of interactions among: DIC × LLL on PH were significant at the 1% level with some exceptions. The highest value of PH (9.5 m) and the lowest one (6.05 m) were achieved in the interactions of CM2DIS × LLL1 and TDIS × LLL3, respectively. The shapes of the energy gradient lines were affected by DIC and LLL treatments used through their effect on ?H/H ratio. However, they followed similar trends. According to the FL values, DIC and LLL treatments could be ranked in the following descending orders TDIS > CM1DIS > CM2DIS and LLL1 > LLL2 > LLL3. The differences in FL among DIC and LLL were significant and the effects of interactions among DIC × LLL on FL were significant at the 1% level. The maximum and minimum values of FL were obtained in the interactions: TDIS × LLL3 and CM2DIS × LLL1, respectively. Therefore, the CM2DIS system is recommended for use where technically feasible.
Effect of drip irrigation circuits design and lateral line length on: II-flow velocity and velocity head  [PDF]
Mohamed Tayel, David Lightfoot, Hani Mansour
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.34063
Abstract: The objectives of the work were to study the effect of drip irrigation circuits (DIC) and lateral lines lengths (LLL) on: Flow velocity (FV) and velocity head (VH). Laboratory tests were conducted at Irrigation Devices and Equipments Tests Laboratory, Agricultural Engineering Research Institute, Agriculture Research Center, Giza, Egypt. The experimental design of laboratory experiments was split in randomized complete block design with three replicates. Laboratory tests carried out on three irrigation lateral lines 40, 60, 80 m (LLL1, LLL2; LLL3) under the following three drip irrigation circuits (DIC): a) one manifold for lateral lines or closed circuits with one manifold of drip irrigation system (CM1DIS); b) closed circuits with two manifolds for lateral lines (CM2DIS), and c) traditional drip irrigation system (TDIS) as a control. Concerning FV values, DIC and LLL treatments could state in the following ascending orders: TDIS < CM1DIS < CM2DIS and LLL1 < LLL2 < LLL3, respectively. FV varied from 0.593 m·sec–1 to 1.376 m?sec–1. i.e FV < 5 ft·sec–1 and this is necessary to avoid the effect of water hammer in the main and sub-main lines, but in lateral line, it can cause silt and clay precipitation problems. The differences in FV among DIC and LLL were significant at the 1% level. The effect of interaction: DIC X LLL on FV values, were significant at the 1% level. The maximum and minimum values of FV were noticed in these interactions: CM2DIS X LLL3 and TDIS X LLL1, respectively. The following ascending orders TDIS < CM1DIS < CM2DIS and LLL1 < LLL2 < LLL3 expressed their effects on VH respectively. Differences in VH among DIC and/or LLL were significant at the 1% with few exceptions. The effects of interactions: DIC X LLL on VH were significant at the 1% level in some cases. The maximum and minimum values of VH were found in the interactions: CM2DIS X LLL3 and TDIS X LLL1, respectively.
Page 1 /10129
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.