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OALib Journal期刊

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匹配条件: “ Alaa El-Gharbawy” ,找到相关结果约13338条。
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Factors That Influence Entrepreneurial Intention within University Students in Egypt  [PDF]
Assem Sharaf, Alaa El-Gharbawy, Mohamed A. Ragheb
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104881
Abstract:
The current research aims to propose a framework of the effects of behav-ioral factors of theory of planned behavior and psychological traits factors on students’ entrepreneurial intention, measuring the size of effect, the circumstances under which the effect is clearly observed and studying the weighted effect of each of the behavior and traits elements. A questionnaire was adopted from previous studies and directed to students in the Egyptian universities. A total number of 430 respondents were considered and data were analyzed using AMOS through conducting SEM models for examining the effect of behavior and traits. Results showed that there is a significant effect of attitude toward behavior on students’ entrepreneurial intention, while there is an insignificant effect of traits.
Identification of four novel phosphorylation sites in estrogen receptor α: impact on receptor-dependent gene expression and phosphorylation by protein kinase CK2
Christopher C Williams, Aninda Basu, Abeer El-Gharbawy, Latonya M Carrier, Carolyn L Smith, Brian G Rowan
BMC Biochemistry , 2009, DOI: 10.1186/1471-2091-10-36
Abstract: Previously uncharacterized phosphorylation sites at serines 46/47, 282, 294, and 559 were identified by manual Edman degradation and phosphoamino acid analysis and confirmed by mutagenesis and phospho-specific antibodies. Antibodies detected phosphorylation of endogenous ERα in MCF-7, MCF-7-LCC2, and Ishikawa cancer cell lines by immunoblot. Mutation of Ser-282 and Ser-559 to alanine (S282A, S559A) resulted in ligand independent activation of ERα as determined by both ERE-driven reporter gene assays and endogenous pS2 gene expression in transiently transfected HeLa cells. Mutation of Ser-46/47 or Ser-294 to alanine markedly reduced estradiol dependent reporter activation. Additionally protein kinase CK2 was identified as a kinase that phosphorylated ERα at S282 and S559 using motif analysis, in vitro kinase assays, and incubation of cells with CK2 kinase inhibitor.These novel ERα phosphorylation sites represent new means for modulation of ERα activity. S559 represents the first phosphorylation site identified in the extreme C-terminus (F domain) of a steroid receptor.ERα is a member of the nuclear receptor superfamily of transcription factors whose activity is primarily regulated by the binding of small lipophilic ligands. Estradiol-induced ERα signaling is indispensable for many physiological processes including reproductive tissue development (uterus, mammary gland, and ovary), bone metabolism, and immune, cardiovascular, and neurological function(1-3). Importantly, ERα has remained the primary pharmacological target for endocrine therapy of ERα positive breast cancer. Selective estrogen receptor modulators (SERMs) such as tamoxifen, as well as estrogen ablation are front line therapies for the treatment of ERα-expressing breast neoplasias.Various aspects of ERα transcriptional activation are dependent on phosphorylation of the receptor. Coactivator recruitment, subcellular localization, receptor dimerization, ligand binding, and posttranslational modifications ar
Virtual water: an effective mechanism for integrated water resources management  [PDF]
Alaa El-Sadek
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.23033
Abstract: In regions, which suffer from water shortage or potential water shortage like the Middle East, water policies and different mitigation measures are formulated. With the increasing population and increasing demand for food and drinking water with the fixed supply of water, the demand management policies have been introduced. Virtual Water has been adopted as an alternative or potential alternative water resource. In the application of the Integrated Water Resources Management (IWRM), virtual water has to be considered as a resource of water. In this paper, the practical value of the virtual water concept as well as the possibility of the application of the concept in the regional and national level are discussed. The paper emphasizes on the application of virtual water in agriculture products and virtual water trade of these products. This research concluded that, there is a possibility for the application of the virtual water concept on the national level taking into account water endowments, and other natural and social economic conditions. The virtual water strategy seeks ways to consciously and efficiently utilize the internal and external water resources to alleviate water scarcity. This, however, by no means implies that importing food is the only response the water scarce countries and regions should and can take. Other measures concerning the supply and demand sides of water management are imperative. The argument here is that the virtual water strategy should be an integral component in the whole package of integrated water resources management.
Modeling of Nitrate Leaching during the Fall–Winter Season in Artificially Drained Soils
Alaa El-Sadek
The Scientific World Journal , 2002, DOI: 10.1100/tsw.2002.204
Abstract:
MINING FEATURE-OPINION IN EDUCATIONAL DATA FOR COURSE IMPROVEMENT
Alaa El-Halees
International Journal of New Computer Architectures and their Applications , 2011,
Abstract: In academic institutions, student comments about courses can be considered as a significant informative resource to improve teaching effectiveness. This paper proposes a model that extracts knowledge from students' opinions to improve and to measure the performance of courses. Our task is to use user-generated contents of students to study the performance of a certain course and to compare the performance of some courses with each others. To do that, we propose a model that consists of two main components: Feature extraction to extract features, such as teacher, exams and resources, from the user-generated content for a specific course. And classifier to give a sentiment to each feature. Then we group and visualize the features of the courses graphically. In this way, we can also compare the performance of one or more courses.
Monuments or Functioning Buildings: Legal Protection over Five Case-Study Historic Hammams in the Mediterranean
Alaa El Habashi
Archnet-IJAR : International Journal of Architectural Research , 2008,
Abstract:
Genotypic Variations in Phenolic, Flavonoids and Their Antioxidant Activities in Maize Plants Treated with Zn (II) HEDTA Grown in Salinized Media  [PDF]
Zeinab A. Salama, Alaa A. Gaafar, Mohamed M. El Fouly
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.63039
Abstract:

Zinc (Zn (II) HEDTA) was used to determine their effect on salt-induced damages in maize plants. The aim of this study was to investigate the antioxidant capacity and the levels of enhanced total phenolic (TPC), total flavonoid (TFC) contents and their antioxidant activity in leaves of two maize cultivars Single cross 10 (SC10) and Single cross 162 (SC162) grown in two levels of salinity 0.00 and 100 mmol in response to 20 μmol Zn (II) HEDTA foliar spray treatments. Significant differences (P ≤ 0.05) in amounts of TPC ranged from (2.55 to 4.62 mg/gdw as Gallic) in Single cross 10 (SC10) and from (2.53 to 4.38 mg/gdw as Gallic) in Single cross 162 (SC162), TFC (ranged 1.53 to 2.41 mg/gdw as qurestien) in Single cross 10 (SC10) and from (1.28 to 2.41 mg/gdw as qurestien) in Single cross 162 (SC162) among all treated plants were observed. The levels of their compounds increase related to foliar spraying of Zn (II) HEDTA. A significant positive correlation between TPC, TFC and DPPH scavenging activity and iron chelating activity was observed which shows that phenolic compounds were involved in the mechanism of salt tolerance of the two cultivars by showing enhanced antioxidant activity which resulted in reduced membrane damage and hence improved growth. According to the results obtained, the adverse effects of salt stress on maize plants can partly be alleviated with application of Zn (II)-HEDTA chelates. It is concluded that the application of Zn (II) HEDTA to maize plants grown in salt conditions leads to the increase of antioxidant compounds and maize tolerance.

To Parallelize or Not to Parallelize, Speed Up Issue
Alaa Ismail El-Nashar
International Journal of Distributed and Parallel Systems , 2011,
Abstract: Running parallel applications requires special and expensive processing resources to obtain the requiredresults within a reasonable time. Before parallelizing serial applications, some analysis is recommendedto be carried out to decide whether it will benefit from parallelization or not. In this paper we discuss theissue of speed up gained from parallelization using Message Passing Interface (MPI) to compromisebetween the overhead of parallelization cost and the gained parallel speed up. We also propose anexperimental method to predict the speed up of MPI applications.
Parallel Performance of MPI Sorting Algorithms on Dual-Core Processor Windows-Based Systems
Alaa Ismail El-Nashar
International Journal of Distributed and Parallel Systems , 2011,
Abstract: Message Passing Interface (MPI) is widely used to implement parallel programs. Although Windowsbasedarchitectures provide the facilities of parallel execution and multi-threading, little attention hasbeen focused on using MPI on these platforms. In this paper we use the dual core Window-basedplatform to study the effect of parallel processes number and also the number of cores on theperformance of three MPI parallel implementations for some sorting algorithms.
THE HORIZON OF DEVELOPINGTHE EGYPTIAN MARKETING TOURISM IN EU
Radwan Alaa El Din Hussien
Annals of the University of Oradea : Economic Science , 2009,
Abstract: Egypt made a tremendous effort during the last few years to enhance its tourism sectors. This was reflected in the number of tourists who visited Egypt, especially form E.U. and also in the revenue from the tourists who jumped in the recent years. Relate
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