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Search Results: 1 - 10 of 507569 matches for " M. E. Abo "
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Vanadium Oxide/Graphene Nanoplatelet as a Cathode Material for Mg-Ion Battery  [PDF]
E. Sheha, M. H. Makled, Walaa M. Nouman, A. Bassyouni, S. Yaghmour, S. Abo-Elhassan
Graphene (Graphene) , 2016, DOI: 10.4236/graphene.2016.54015
Abstract: The aim of the present work is to introduce a high performance cathode for magnesium-ion batteries. A simple ball mill process is employed to synthesize (V2O5)1-x (Graphene Nanoplatelets (GNP))x nanocomposite, (where x = 0, 5, 10, 15, 20 and 25 wt.% GNP). The synthesized samples are characterized using scanning electron microscope (SEM), X-ray diffraction (XRD) technique, impedance spectroscopy, cyclic voltammetry and charge-discharge test. The maximum conductivity of the investigated samples was found to be 6 × 10-1 S/cm for optimum composite film (25 wt% GNP) at room temperature. Room temperature rechargeable magnesium batteries are constructed from Mg as anode material, (V2O5)1-x(GNP)x as a cathode material and the simple non-aqueous electrolyte based MgNO3·6H2O. Mg/V2O5 cells employing as-prepared electrolyte exhibit initial discharge capacity ~100 mAhg-1 while Mg/(V2O5/GNP (x = 25t.%)) cathode produces a lower initial capacity of ~90 mAhg-1. The high initial discharge capacity of V2O5 can be attributed to the presence of a large (001) interlayer spacing (~11.53 A) for facile Mg+ insertion/extraction.
Activities of Some Enzymes During Seed Germination of Some Leafy Vegetables under Saline Drainage Water
E.M. Abo-Kassem
Biotechnology , 2005,
Abstract: Seeds of five leafy vegetable crops were germinated to determine the effect of saline agriculture drainage water used as a resource to planting high value horticultural crops. Some glycolytic enzymes (Embeden-Meyerhof-Parnas: EMP) and Pentose Phosphate Pathways (PPP) enzymes [namely, Pyruvate Kinase (PK), lactate dehydrogenase (LDH), glucose 6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate dehydrogenase (6PGDH) were investigated in addition to alcohol dehydrogenase (ADH). The leafy vegetables included `Red Giant` mustard greens [Brassica juncea L. (Czerniak)], `Vitamen Green` salad greens [Brassica rapa L., (Narinosa Group)], pac choi [Brassica rapa L., (Chinensis Group)], `Winterbor` kale [Brassica oleracea L., (Acephala Group)] and tatsoi [Brassica rapa L. (Narinosa Group)].. The enzyme activity levels differ with various varieties in response to different saline concentrations. However, in mustard greens PK and 6PGDH were inhibited while LDH, ADH and G6PDH were activated in response to salinity stress. In salad greens, salinity inhibited both ADH and 6PGDH whereas LDH activity was activated up to 15 dS m-1. In addition, in salad greens PK and G6PDH were inhibited with low and activated with high saline concentrations. In tatsoi, salinity activated PK and ADH but inhibited LDH, G6PDH and 6PGDH. ADH and 6PGDH were activated in pac choi seedlings, while LDH was inhibited in response to salinity. PK and G6PDH in pac choi were inhibited at low and moderate (7, 11 and 15 dS m-1) saline concentrations, but were stimulated at higher concentrations (19 and 23 dS m-1). In kale, the response of the enzyme activities to salinity differed where PK and LDH from (EMP) and G6DH from (PP) pathways were enhanced with the increasing saline concentration, whereas ADH and 6PGDH (PPP) pathways were inhibited in response to the irrigation saline water. In conclusion, the enzymes of PP pathway and those of glycolysis expressed different response to salinity regardless the plant cultiver. The induction of some tested enzymes by salinity could be of a crucial importance in protecting the living cell.
Bioethanol Production from Rice Straw Enzymatically Saccharified by Fungal Isolates, Trichoderma viride F94 and Aspergillus terreus F98  [PDF]
Mervate A. Abo-State, Ahmed M. E. Ragab, Nour Sh. EL-Gendy, Laila A. Farahat, Hekmat R. Madian
Soft (Soft) , 2014, DOI: 10.4236/soft.2014.32003

Egypt faces a high population growth rate nowadays, which demands for an increase in agricultural production efficiency. Consequently, agricultural field residues will increase. Rice straw is one of the main agriculture residues in Egypt. So this study was performed on rice straw as a resource for production of bioethanol. Eight microbial isolates, five yeasts and three fungi were isolated from rice straw. Yeast isolates were selected for their ability to utilize different sugars and cellulose. Chipped and grinded rice straw was subjected to different pretreatment methods physically through steam treatment by autoclaving and different doses of gamma γ irradiation (50 and 70 Mrad). Autoclaved pretreated rice straw was further enzymatically treated throughout solid state fermentation process by different fungal isolates; F68, F94 and F98 producing maximum total reducing sugars of 12.62, 13.58, 17.00 g/L, respectively. Bioethanol production by separate microbial hydrolysis and fermentation (SHF) process of rice straw hydrolysate was performed by the two selected fungal isolates; Trichoderma viride F94 and Aspergillus terreus F98 and two yeast isolates (Y26 and Y39). The two yeast isolates have been identified by 18S, RNA as Candida tropicalis Y26 and Saccharomyces cerevisiae Y39. SHF processes by F94 and Y26 produced 45 gallon/ton rice straw while that of F98 and Y39 produced 50 gallon/ton rice straw.

Multigrid Method for the Numerical Solution of the Modified Equal Width Wave Equation  [PDF]
Yasser M. Abo Essa
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.710102
Abstract: Numerical solutions of the modified equal width wave equation are obtained by using the multigrid method and finite difference method. The motion of a single solitary wave, interaction of two solitary waves and development of the Maxwellian initial condition into solitary waves are studied using the proposed method. The numerical solutions are compared with the known analytical solutions. Using error norms and conservative properties of mass, momentum and energy, accuracy and efficiency of the mentioned method will be established through comparison with other methods.
A. A. Abo Khadra,,A. M. Kozae,,M. E. Ali
International Journal of Engineering Science and Technology , 2010,
Abstract: In this paper, we need to define a new definition for a correlation factor using semi rough sets technique. This definition is very simpler than statistic definition, that gives us a capability to deal with all information tables (quantities and qualitative). By using this definition, the boundary region will be decreased according to theincreasing of the positive and negative regions. We can make the reduction of any information system tables by using the definition of semi correlation factor.
Estimation of the Parameters of the Reversed Generalized Logistic Distribution with Progressive Censoring Data
Z. A. Abo-Eleneen,E. M. Nigm
International Journal of Mathematics and Mathematical Sciences , 2010, DOI: 10.1155/2010/539860
Abstract: The reversed generalized logistic (RGL) distributions are very useful classes of densities as they posses a wide range of indices of skewness and kurtosis. This paper considers the estimation problem for the parameters of the RGL distribution based on progressive Type II censoring. The maximum likelihood method for RGL distribution yields equations that have to be solved numerically, even when the complete sample is available. By approximating the likelihood equations, we obtain explicit estimators which are in approximation to the MLEs. Using these approximate estimators as starting values, we obtain the MLEs using iterative method. We examine numerically MLEs estimators and the approximate estimators and show that the approximation provides estimators that are almost as efficient as MLEs. Also we show that the value of the MLEs decreases as the value of the shape parameter increases. An exact confidence interval and an exact joint confidence region for the parameters are constructed. Numerical example is presented in the methods proposed in this paper. 1. Introduction There are many scenarios in life-testing and reliability experiments whose units are lost or removed from experimentation before failure. The loss may occur un intentionally, or it may have been designed so in the study. In many situations, however, the removal of units prior to failure is preplanned in order to provide saving in terms of time and cost associated with testing. There are types of censored test. Type I and Type II have been investigated extensively by many authors (see, e.g., [1–3]). A generalization of type II censoring is progressive Type II censoring. Under this scheme, units are placed in test at time zero. Immediately following the first failure, surviving units are removed from the test at random. Then, Immediately following the second failure, surviving units are removed from the test at random. This process continues until, at the time of the observed failure, the remanding are all removed from the experiment. In this censoring scheme, are all prefixed. However, in some particle situations, the size may occur at random (see [4]). Note that if , then which corresponds to the type II censoring. If , then which corresponds to the complete sample. The statistical inference on the parameters of lifetime distribution under progressive Type II censoring has been studied by many authors such as Cohen [5], Mann [1], Viveros and Balakrishnan [6], and Balakrishnan and Sandhu [7]. Viveros and Balakrishnan has discussed inference for the Weiblull and exponential distributions
Reactions and Resistance Status of Differential Rice Genotypes to Rice Yellow Mottle Virus, Genus Sobemovirus in Cote d`Ivoire
A. Onasanya,Y. Sere,F. Nwilene,M.E. Abo
Asian Journal of Plant Sciences , 2004,
Abstract: High yielding rice genotypes with good levels of resistance to RYMV were identified at Africa Rice Center-WARDA in Cote d`Ivoire. The yields and resistance stability of these genotypes, however, remain uncertain. The performance of 13 genotypes over 10 different RYMV isolates from 7 localities in Cote d`Ivoire was tested in the screenhouse. Chlorophyll (SPAD) and yield reductions due to RYMV disease were evaluated. Considerable diversity was observed in the reactions of these genotypes to all the RYMV isolates. Percentage yields and SPAD reduction were between 2.3-90.3 and 5.3-40%, respectively. Of 13 rice genotypes studied, IR 47686-15-1-1(P) had the lowest mean SPAD and yield reductions. The levels of resistance shown by japonicas were better than those of indicas. Six genotypes (FARO 11; GIGANTE (tete); H 232-44-1-1; IR 47686-15-1-1(P); IR 47686-15-1-1; ITA 235) could be described as possessing both stable and acceptable levels of resistance to RYMV. The high genotype by environment interactions in the reactions of the rice genotypes to RYMV suggests the possible existence of different strains of RYMV in Cote d`Ivoire. This information could be useful in rice breeding programs aiming at deployment of RYMV resistant genotypes to different rice ecologies and localities in Cote d`Ivoire.
Similarity/dissimilarity analysis of protein sequences using the spatial median as a descriptor  [PDF]
Mervat M. Abo-Elkhier
Journal of Biophysical Chemistry (JBPC) , 2012, DOI: 10.4236/jbpc.2012.32016
Abstract: A novel 3-D graphical representation of protein sequence has been introduced. A right cone of a unit base and unit height has been selected to represent protein sequences on its surface. The twenty amino acids have been represented by 20 circles and all protein's residues have been represented by n lines on the cone's surface. All the spots which represent the protein's residues have been shown in the cone's top view. The spatial median of all the spots is used as a new descriptor of any protein sequence. This approach was applied on two short segments of protein of yeast Saccharomyces cerevisiae. The examination of the similarities/dissimilarities for the eight ND5 proteins and the six β-globin proteins illustrate the utility of our approach. A linear correlation and significance analysis have been provided to compare our results and the percentage sequence alignment identity.
Application on local discrete expansion
M. E. Abd El-Monsef,A. M. Kozae,A. A. Abo Khadra
International Journal of Mathematics and Mathematical Sciences , 1996, DOI: 10.1155/s0161171296001032
Abstract: The process of changing a topology by some types of its local discrete expansion preserves s-closeness, S-closeness, semi-compactness, semi-Ti, semi-Ri, i ¢ {0,1,2}, and extremely disconnectness. Via some other forms of such above replacements one can have topologies which satisfy separation axioms the original topology does not have.
Extinction efficiencies of coated absorbing aerosols measured by cavity ring down aerosol spectrometry
A. Abo Riziq, M. Trainic, C. Erlick, E. Segre,Y. Rudich
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2008,
Abstract: In this study, we measure the extinction efficiency at 532 nm of absorbing aerosol particles coated with a non-absorbing solid and liquid organic shell with coating thickness varying between 5 and 100 nm using cavity ring down aerosol spectrometry. For this purpose, we use nigrosin, an organic black dye, as a model absorbing core and two non-absorbing organic substances as shells, glutaric acid (GA) and Di-Ethyl-Hexyl-Sebacate (DEHS). The measured behavior of the coated particles is consistent with Mie calculations of core-shell particles. Errors between measured and calculated values for nigrosin coated with GA and DEHS are between 0.5% and 10.5% and between 0.5% and 9%, respectively. However, it is evident that the calculations are in better agreement with the measured results for thinner coatings. Possible reasons for these discrepancies are discussed.
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