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El‑Sayed M. Sherif,Fahamsyah H. Latief,Hany S. Abdo,Nabeel H. Alharthi 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.6
In this study, manufacturing of Ti–5Al and Ti–5Al–5Cu alloys were accomplished employing mechanical alloying technique. The corrosion resistance in 3.5 wt% NaCl solution of Ti–5Al and Ti–5Al–5Cu alloys was investigated using cyclicpolarization (CPP), electrochemical impedance spectroscopy (EIS) and chronoamperometric current–time measurements. The corroded surfaces of Ti–5Al and Ti–5Al–5Cu were examined by the use of a scanning electron microscopy and energydispersive X-ray spectroscopy. It is found that Ti–5Al suffers both uniform and pitting corrosion, particularly with prolongingthe time of exposure period in the chloride solution. While, the addition of Cu, Ti–5Al–5Cu alloy, increases the intensity ofuniform corrosion and decreases the probability of pitting attack. Prolonging the immersion time to 48 h before measurementdecreases the corrosion of Ti–5Al alloy, while increases the corrosion of Ti–5Al–5Cu.
Alleviation of salt stress in Triticum aestivum by biopriming with Phanerochaete chrysosporium
Hanan El-Sayed Dief,El-Sayed A. Hashem,Salwa Fawzan,Ashraf S. A. El-Sayed 한국작물학회 2021 Journal of crop science and biotechnology Vol.24 No.1
Wheat is one of the most important cereals, vital basic crop in Egypt, covering approximately 32.6% of the total winter land. However, sensitivity to abiotic stress especially salinity is one the major current hurdles that reduce the global yield of this crop. Plant biopriming with fungi is the recent technology that might alleviate the salt stress eff ect. Thus, the objective of this work was to examine the eff ect of Triticum aestivum grains biopriming with Phanerochaete chrysosporium on the response of wheat to salt stress. From the physiological and biochemical parameters, biopriming of wheat grains with P. chrysosporium significantly alleviates the salt stress and markedly increases the growth parameters, photosynthetic pigments and osmolytes (soluble sugars, soluble protein and proline) contents. In addition, it alleviates the oxidative damage, as indicated by the lower accumulation of malondealdehyde and increasing the activity of antioxidant enzymes; superoxide dismutase, catalase, and ascorbate peroxidase in wheat seedlings. Results indicate the potential of using P. chrysosporium biopriming for reducing the deteriorating eff ects of salinity.
El-Sayed M. Sherif 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
The corrosion behavior of aluminum and its inhibition by 3-amino-1,2,4-triazole-5-thiol (ATAT) in naturally aerated stagnant Arabian Gulf water was reported. The work was carried out using electrochemical impedance spectroscopy (EIS), cyclic potentiodynamic polarization (CPP), and potentiostatic current–time (CCT) measurements. EIS data indicated that ATAT decreased the corrosion of Al by increasing the solution and polarization resistances, the impedance of the interface and the maximum degree of phase angle. ATAT was also found to decrease the cathodic, anodic, and corrosion currents and corrosion rate as well as increase the polarization resistance of Al as confirmed by the CPP and CCT measurements.
El Said A. Nouh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Cloud point extraction (CPE) was used for Eu(III) determination in water samples using flame atomic absorption spectrometry (FAAS). Complex of Eu(III) with alizarin red S was extracted into the surfactant- rich phase of octylphenoxypolyethoxyethanol (Triton X-114) from samples at room temperature in presence of an amount of NaNO3. The parameters affecting CPE such as sample pH and concentrations of NaNO3, complexing agent and Triton X-114 were studied. Under the optimized conditions, the limit of detection (3s) was 6 ng mL1 and the relative standard deviation (RSD) was 1.95%. The method was successfully applied to Eu(III) determination in water samples.
Said Ait Talhajt,Mohammed El Amine Ghanjaoui,Sana Esserrar,Bouchra Nechchadi,Anas Salhi,Mohammed El Krati,Soufiane Tahiri 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
This work aims to treat paint wastewater from industrial equipment cleaning by electrocoagulation (EC)using aluminum electrodes and reusing residual sludge as a starting material for synthesizing a blue inorganicnano-pigment. An initial pH of the wastewater without adjustment, a current density of 133.33 A/m2, an electrolysis time of 30 min and an inter-electrode distance (IED) of 2 cm were the best operatingconditions for EC. The reduction rate of COD and turbidity was about 92% and 99.6%, respectively. At optimumconditions, specific metal consumption and specific electrical energy consumption are about 0.168kg/m3 and 15 kWh/m3, respectively. The paint wastewater treatment sludge (PWTS) from EC was firstcharacterized and then mixed with cobalt(II) chloride to synthesize an inorganic blue nano-pigment. The effects of Co/Al molar ratios and temperatures were studied. From colorimetric data, the pigmentobtained at 1100 C is more bluish than those synthesized at a lower temperature. This study will havebeneficial effects on the environment as well as on the economy because it makes it possible to transformPWTS into value-added products. Treated wastewater can be reused for paint equipment cleaning and ECsludge can be completely transformed into pigment. The zero-waste principle can therefore be achieved.
Memory response in elasto-thermoelectric spherical cavity
El-Attar, Sayed I.,Hendy, Mohamed H.,Ezzat, Magdy A. Techno-Press 2020 Coupled systems mechanics Vol.9 No.4
A mathematical model of electro-thermoelasticity subjected to memory-dependent derivative (MDD) heat conduction law is applied to a one-dimensional problem of a thermoelectric spherical cavity exposed to a warm stun that is an element of time in the presence of a uniform magnetic field. Utilizing Laplace transform as an instrument, the issue has been fathomed logically within the changed space. Numerical inversion of the Laplace transform is carried for the considered distributions and represented graphically. Some comparisons are shown in the figures to estimate the effects of MDD parameters and thermoelectric properties on the behavior of all considered fields.
In-vitro release and in-vivo performance of tolmetin from different topical gel formulations
Sayed Hassan Auda,Saleh Abd El-Rasoul,Mahmoud Mohamed Ahmed,Shaaban Khalaf Osman,Mahmoud El-Badry 한국약제학회 2015 Journal of Pharmaceutical Investigation Vol.45 No.3
This study was designed to evaluate the suitability of Pluronic F-127, different grades of Carbopol and cellulosic polymers as gel bases containing tolmetin, a nonsteroidal anti-inflammatory drug. In vitro release characteristics, effect of enhancers, viscosity and the mechanism of drug release for different gel bases was studied as well as the anti-inflammatory activity were evaluated. The results showed that the HPMC gel has the superior percent of drug release than the others. The percent released of drug from Carbopol and the Pluronic F-127 gels is concentration defendants. It was found that the drug release from the tested gel bases obeyed the diffusion mechanism. The use of propylene glycol and urea in different concentrations (3.0, 5.0 and 10 % w/v) had enhanced the percent of drug release significantly (p<0.05). The anti-inflammatory activity of the drug in Carbopol gel formulation showed excellent anti-inflammatory activity. These finding highlight the potential local application of tolmetin gel as topical anti-inflammatory medication.
New Delay Dependent Robust Stability Criteria for T–S Fuzzy Systems with Constant Delay
Said Idrissi,El Houssaine Tissir,Ismail Boumhidi,Noreddine Chaibi 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.5
This paper deals with the problem of delay dependent robust stability for T–S fuzzy time delay systems. The approach based on constructing a new Lyapunov-Krasovskii functional by dividing uniformly the delay interval into N segment with N is positive integer, and using Finsler’s lemma. This new Lyapunov-Krasovskii functional is chosen with different weighted matrices corresponding to dif-ferent segments. The perturbations considered are norm bounded, and the results are expressed in terms of linear matrix inequality (LMIs). Numerical examples are provided to show the effectiveness of the present method, compared with some recent previous ones.
Environmental Chemicals Inhibit Sperm Tyrosine Phosphorylation
El-Sayed A. Mohamed,Yoo-Jin Park,Woo-Sung Kwon,Sung-Jae Yoon,Kyu-Hyun Jeong,Myung-Geol Pang 한국동물생명공학회(구 한국동물번식학회) 2011 발생공학 국제심포지엄 및 학술대회 Vol.2011 No.1
Phosphorylation of proteins is a post-translational modification process which plays a significant role in a wide range of cellular processes. Addition or removal of phosphate groups result in conformational changes in proteins leading either to their activation or inactivation. Tyrosine phosphorylation of protein is associated with sperm function in several mammalian species. The control of this process may via the changes in cyclic adenosine monophosphate (cAMP); the changes in cAMP levels that occur in the spermatozoa regulate protein kinase A (PKA) activity which, in turn, leads to the tyrosine phosphorylation of protein substrates by either the activation of sperm tyrosine kinases and/or the inhibition of phosphoprotein phosphatases. Cyclic nucleotides, in particular, cAMP, are important regulators of various maturation events in sperm including capacitation and motility. Interestingly, some environmental chemicals (ECs) may exert broader endocrine disrupting effects through possible modulation of cAMP/PKA second messenger systems. Otherwise, because the mature spermatozoa are transcriptionally inactive, therefore the study of sperm proteins phosphorylation may permit more information about the agents and conditions affects on sperm function. In the present study, to examine the effect of ECs on human sperm function, human spermatozoa were incubated with a group of ECs represent a widespread chemicals in the environment bisphenol A (BPA, 100 μM), nonylphenol (NP, 10 μg/ml), 2,3,7,8-Tetrachlorodibenzo- pdioxin (TCDD, 2.5 μg/ml), genistein (Gen, 100 μM), and the following pesticides, dibromochloropropane (DBCP, 10 μg/ml), atrazine (Atraz, 500 μM), and diazinone (Diaz, 500 μM) for 6 hr at 37℃ in 5% CO2. Then, western blot analysis was carried out using extracted sperm proteins. Antiphosphorylation antibody (pY20) was used to determine sperm tyrosine phosphorylation after EDs treatment. The pY20 antibody labeled three common bands of approximately 90, 110, and 150 KDa. There were no significant differences between negative and positive control groups in regard to the tyrosine phosphorylated proteins except at the band with molecular weight 110 KDa. However, except Diaz treatment group, the other treatment groups showed decreasing (TCDD, Gen, NP, BPA, and DBCP) or increasing (Atraz) in the tyrosine phosphorylated proteins at least in one band from the three common bands studied. Therefore, it sug-gests that ECs effectively alters human sperm function and this effect may detect via their effect on tyrosine phosphorylation pattern.
E-Folklore and cyber-communication among Emirati youth
El-Sayed el-Aswad 국립민속박물관 2014 International Journal of Intangible Heritage Vol.9 No.-
The objective of this article is to explain the emergence of anew mediated heritage-social sphere and the articulation ofa contemporary Emirati identity that transforms traditionaloral heritage into an innovative form of electronic folkheritage. The literature addressing changes in folkheritage caused by the flourishing of new media, as wellas off- and on-line social networking in the UAE, is scant. This research seeks to fill that gap by showing howEmirati nationals have succeeded in assimilating outsideinfluences without deserting their heritage, and howglobal and local forms of communication have generatedunique cultural patterns that help Emirati peoplemaintain their identity, authenticity and socialconnectivity in a globally changing world. The studyshows that the Internet provides information zones,enhancing people’s knowledge, and interaction zones,strengthening people’s social relationships. Tounderstand these two domains, this inquiry addressesonline heritage and cyber-communication as used byboth the UAE government (formal network) and ordinaryE-Folklore and cyber-communicationamong Emirati youthpeople (informal network). For the purpose of theorisinge-folklore, this research proposes a paradigm dealingwith the content and form of heritage by bridgingtraditional/oral and technical/textual forms ofcommunication. For Emirati young people, focusing oncontent allows for unusual engagement with the pastthrough technologies that have the potential to shape andinfluence their future heritage. Emirati folk heritage hasundergone a sort of ‘cyber-communication’ or‘internetisation’, which means a process through whichcore elements of folk heritage are mediated by theInternet, reaching diverse audiences and allowing forbroad public participation.