Aly Said - Academia.edu (original) (raw)

Papers by Aly Said

J. Egypt. Nat. Cancer …, 2003

... ALI MOSTAFA, MD*; EMAD EBEID, MD**; TAREK MANSOUR, MD***; MANAL AMIN, MD**; IMAN SIDHOM, MD**... more ... ALI MOSTAFA, MD*; EMAD EBEID, MD**; TAREK MANSOUR, MD***; MANAL AMIN, MD**; IMAN SIDHOM, MD**; ASHRAF KHAIRY, MD** and HOSSAM EL ZOMOR, M.Sc.** Department of Pediatrics*, Faculty of Medicine, Cairo University, Pediatric Oncology** and Virology ...

Pediatric Blood & Cancer, 2015

We describe an outbreak of mucormycosis in a pediatric oncology hospital during December 2010 and... more We describe an outbreak of mucormycosis in a pediatric oncology hospital during December 2010 and the measures taken to stop it. The outbreak began with two consecutive cases of laboratory-documented mucormycosis infections within 1 week. Investigations to track the source were conducted immediately. Air plate cultures from machines and ducts supplying patients' rooms revealed the growth of Rhizomucor. Of five affected patients, all had acute leukemia and three were histopathologically proven. All patients were treated with liposomal amphotericin B after mucormycosis was diagnosed. Posaconazole was used as a secondary prophylaxis in one case. Three patients died. Pediatr Blood Cancer

React ions of 6-ary l-5-cyano-2-thiouracil derivatives 1a,b with a variety of reagents leads to t... more React ions of 6-ary l-5-cyano-2-thiouracil derivatives 1a,b with a variety of reagents leads to the synthesis of some new pyrimid ines and condensed pyrimid ines. The antibacterial activ ity was studied against examples of Gram-positive and Gram-negative bacteria.

Journal of the Iranian Chemical Society, 2015

In connection with our programme aiming to investigate the cyclization reaction of uracil bearing... more In connection with our programme aiming to investigate the cyclization reaction of uracil bearing more reactive centers in addition to the possibility of pyrimidine ring transformation [1, 2, 21] we have tried to prepare some condensed pyrimidines. The starting material thiouracils 1a and 1b were obtained as described by [18, 19]. Thioxopyrimidine 1a undergo thiazole ring formation upon its reaction with chloroacetic acid and p-chlorobenzaldehyde in a mixture of acetic acid and acetic anhydride in the presence of fused sodium acetate to yield thiazolopyrimidine derivative 2. None of the expected products 3-5 were obtained (scheme 1). The formation of 2 is potentiated by the following facts: 1. Thermodynamically stable product. 2. The appearance of two carbonyl bands at 1761 and 1694 cm −1 in addition to cyano function at 2219 cm −1. 3. The absence of NH proton in 1 H NMR. The synthesis of N-cyanomethylpyrimidine derivative 6 was achieved by alkylation of compound 1a using chloroacetonitrile to give N-alkylated derivative 6. The structure of 6 was confirmed from IR spectrum that showed C≡N absorption band at 2224 cm −1 in addition to C=O band at 1686 cm −1. Moreover, the 1 H NMR spectrum showed two singlets at δ = 2.77 and 5.20 ppm corresponding to SCH 3 and CH 2 , respectively. Hydrazinolysis of 6 with hydrazine hydrate resulted in ring transformation affording diaminopyrimidine derivative 7. The formation of 7 was supported by 1 H NMR spectrum that showed three singlets at δ = 4.15, 4.41 and 11.50 ppm for NH 2 , CH 2 and NH, respectively.

Alexandria Science Exchange Journal

The objective of this study was to investigate the effect of priming wheat seeds (Triticum aestiv... more The objective of this study was to investigate the effect of priming wheat seeds (Triticum aestivum, Giza171 local wheat genotype) with bulk cellulose (BC) and nanocellulose crystals (NC) aqueous solutions and their urealoaded formulations on different germination parameters. BC was extracted from rice straw. NC was prepared from BC through bleaching, acid hydrolysis, and flocculation processes. Priming treatments were prepared using six BC and NC concentrations, three urea concentrations, and their combinations in a completely randomized design with three replicates. Seeds were soaked in the treatment solutions for 3 hrs, and then germinated on wet filter papers in Petri dishes for 7 days at 28ºC. Results revealed that NC treatments significantly increased root length and surface area, and vigor index compared to BC treatments which had significant positive effect on Germination percentage, root fresh weight, and root radius. The concentration of 0.5% BC or 0.3% NC recorded the significantly highest values of all parameters except root radius. Although application of 0.5% urea significantly increased root fresh weight and root radius, significant reduction in Germination percentage, root length, and vigor index was observed. According to the statistical analysis of the vigor index data obtained, priming wheat seeds using 0.3% NC without urea loaded is the most efficient treatment to enhance germination of wheat seeds.

Sensors and Actuators A: Physical, 2019

This paper is aimed at the validation of a theoretical analysis of the properties of nonlinearly-... more This paper is aimed at the validation of a theoretical analysis of the properties of nonlinearly-operated weakly-coupled resonators (WCRs) for resonant sensing applications. In particular, we investigate the relationships between the operating point of such devices and different performance indicators, such as parametric sensitivity, sensitivity to drive level and to noise, and bandwidth. To this end, a couple of high-Q MEMS resonators exhibiting nonlinear restoring and damping forces are used. A careful characterization of the resonators and their associated electronics is made, resulting in a very good, quantitative fit between the experimental results and those predicted by theory.

Open Journal of Civil Engineering, 2018

Nanomaterials have been widely used in the past few decades due to their proven capacity to enhan... more Nanomaterials have been widely used in the past few decades due to their proven capacity to enhance the mechanical properties of materials. While many studies have sought to improve the understanding of how nanomaterials affect the behavior of concrete, additional research is needed in order to achieve the full potential of the material, especially in the presence of supplementary cementitious materials. This study aims to investigate the mechanical properties of cement mortars incorporating both nano-silica (NS) and class F fly ash (FA). Furthermore, mercury intrusion porosimetry (MIP) was performed to study its effect on pore characteristics, and thermogravimetric analysis (TGA) was performed to measure the calcium hydroxide Ca(OH) 2 content in the mixtures. It was found that using nano-silica enhances the compressive strength, reduces the total porosity and accelerates the pozzolanic reaction.

Fibers, 2016

Large residual strain in reinforced concrete structures after a seismic event is a major concern ... more Large residual strain in reinforced concrete structures after a seismic event is a major concern for structural safety and serviceability. Alternative reinforcement materials like fiber-reinforced polymer (FRP) have been widely used to mitigate corrosion problems associated with steel. Low modulus of elasticity and brittle behavior compared to steel has made the use of FRP unsuitable in seismic resistant strictures. A combination of steel-FRP reinforcement configuration can address the problem of corrosion. Therefore, introducing a material that shows strong post elastic behavior without any decay due to corrosion is in demand. Shape memory alloy (SMA), a novel material, is highly corrosion resistive and shows super elastic property. Coupling SMA with FRP or steel in the plastic hinge region allows the structure to undergo large deformations, but regains its original shape upon unloading. In this study, the performance characteristics of four previously tested beam-column joints reinforced with different configurations (steel, SMA/steel, glass fiber reinforced polymer (GFRP) and SMA/FRP) are compared to assess their capacity to endure extreme loading. Experimental results are scrutinized to compare the behavior of these specimens in terms of load-story drift and energy dissipation capacity. SMA/FRP and SMA/Steel couples have been found to be an acceptable approach to reduce residual deformation in beam-column joints with adequate energy dissipation capacity. However, SMA/FRP is superior to SMA/Steel concerning to the corrosion issue in steel.

Acta Ophthalmologica Scandinavica, 2009

The study was conducted on 66 different genotypes of four wheat groups viz Local genotype (LG), M... more The study was conducted on 66 different genotypes of four wheat groups viz Local genotype (LG), Mapping population (MP), Synthetic (Syn) and NIBGE cultivars subjected to drought stress. Wheat samples were collected from Plant Genomic Molecular Biology lab at NIBGE, Faisalabad and work was performed for isolation of DNA along with DNA fingerprinting on PCR. Antioxidant enzymes viz SOD, CAT and APX were analyzed in the Central Hi-Tech Lab., University of Agriculture, Faisalabad. Preparation of the samples for osmolytes and the enzymes were done in Molecular Biochemistry lab. HPLC analysis was also performed in the Central Hi-Tech Lab. of the university. 3.1 Cultivation of plants and culture conditions The wheat germplasm contained Local Genotype (LG = 20), Mapping Population (MP = 20), Synthetic (Syn = 20) and NIBGE = 06 varieties. The genotypes were grown in two different conditions i.e., normal as well as water stress conditions. Healthy seeds of wheat genotypes for each group were selected and geminated in sand filled plastic glasses. Hoagland solution was applied per pot at initial level. Later on, polyethylene glycol (PEG)