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- 검색키워드
- 저자 : M. M. El-Sayed (검색결과 122 건)
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Salama, El-Sayed,Jeon, Byong-Hun,Chang, Soon Woong,Lee, Sang-hun,Roh, Hyun-Seog,Yang, Il-Seung,Kurade, Mayur B.,El-Dalatony, Marwa M.,Kim, Do-Hyeon,Kim, Ki-Hyun,Kim, Sunjoon Elsevier 2017 Journal of cleaner production Vol.168 No.-
<P><B>Abstract</B></P> <P>Enhancement of microalgal growth and fatty acid production is essential for development of a microalgae-based biodiesel production platform. Three different microalgal species (<I>Scenedesmus obliquus</I> GU732418, <I>Ourococcus multisporus</I> GU732424 and <I>Chlorella vulgaris</I> FR751187) were individually cultivated in media containing both indole-3-acetic acid (IAA) and diethyl aminoethyl hexanoate (DAH) at concentrations of 10<SUP>−8</SUP>−10<SUP>−4</SUP> M. Combined phytohormones (10<SUP>−8</SUP> to 10<SUP>−5</SUP> M) increased the growth of all three species compared to growth in media without phytohormones. IAA and DAH supported the maximum growth of <I>S</I>. <I>obliquusi</I> (38.12 × 10<SUP>6</SUP> cells mL<SUP>−1</SUP>) at 10<SUP>−8</SUP> M, <I>O</I>. <I>multisporus</I> (85.89 × 10<SUP>6</SUP> cells mL<SUP>−1</SUP>) at 10<SUP>−6</SUP> M, and <I>C. vulgaris</I> (4.09 × 10<SUP>6</SUP> cells mL<SUP>−1</SUP>) at 10<SUP>−5</SUP> M. Addition of 10<SUP>−7</SUP> M IAA and DAH also assisted the removal of Zn<SUP>2+</SUP> (97%), K<SUP>+</SUP> (88%) and Mg<SUP>2+</SUP> (99%) from the media by <I>S</I>. <I>obliquus</I>. The highest removal of Zn<SUP>2+</SUP>, K<SUP>+</SUP>, and Mg<SUP>2+</SUP> by <I>C</I>. <I>vulgaris</I> was achieved at 10<SUP>−5</SUP> M IAA and DAH. Under all experimental conditions (10<SUP>−8</SUP>−10<SUP>−4</SUP> M IAA and DAH) the amounts of poly-unsaturated fatty acids were significantly increased. Palmitic acid, linoleic acid and γ-linolenic acid were the major fatty acids, accounting for 11.75–21.55%, 2.55–6.73%, and 52.93–75.89% of the total fatty acid content, respectively. The fatty acids that accumulated in <I>O</I>. <I>multisporus</I> and <I>C</I>. <I>vulgaris</I> were found to be suitable for production of high quality biodiesel with characteristics equivalent to crop seed oil-derived biodiesel.</P> <P><B>Highlights</B></P> <P> <UL> <LI> IAA and DAH in the range of 10<SUP>−8</SUP>−10<SUP>−5</SUP> M enhanced the growth of algae. </LI> <LI> PUFAs was increased by growth in medium containing both IAA and DAH. </LI> <LI> Accumulated fatty acids in algae are suitable for production of high quality biodiesel. </LI> </UL> </P>
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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.
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Benyoussef M.,Mura T.,Saitzek S.,Azrour F.,Blach J.-F.,Lahmar A.,Gagou Y.,El Marssi M.,Sayede A.,Jouiad M. 한국물리학회 2022 Current Applied Physics Vol.38 No.-
Nanostructured BaTi1-xSnxO3 (x = 0, 0.05 & 0.075) were successfully synthesized using the modified Pechini processing method. The phase purity and symmetry were examined by X-ray diffraction and Raman spectroscopy. Tetragonal symmetry was obtained for BaTiO3 (BT) while orthorhombic symmetry for Sn doped BT. BT exhibits an up-shift of the Curie temperature towards high temperatures (TC = 139 ◦C). In contrast, a down-shift was recorded for Sn doped BT. Then, indirect electrocaloric (EC) adiabatic temperature change ΔT and the energy storage performances were determined based on ferroelectric hysteresis loops. Interestingly, large EC responsivity of ΔT/ΔE = 0.81 × 10-6 K m/V was obtained for the BT accompanied with a moderate stored energy of 23 mJ/cm3 but with a high energy efficiency of 67%. The incorporation of Sn in BT was found to broaden the EC responsivity and to improve the energy efficiency up to 90%, recorded for the 5% Sn doped BT.
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Abdelwahed R. Sayed,Hany M Abd El-lateef,Ahmad Desoky M. Mohamad 한국고분자학회 2018 Macromolecular Research Vol.26 No.10
In this paper polyhydrazide incorporated with thiadiazole moiety (S5) was prepared and its chemical configuration was confirmed by spectroscopic methods (FTIR, 1H NMR, and 13C NMR). The inhibitive action of S5 polymer and its monomer 2,5-dihydrazinyl-1,3,4-thiadiazole (M1) on the C-steel corrosion in pickling acids solution was investigated by weight loss, potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) measurements. PDP method exhibited that the investigated polymer is mixed-type corrosion inhibitor in both acids (HCl and H2SO4). The data revealed that S5 compound is a good inhibitor for Csteel in studied acids, and protection efficiency (P%) follows this sequence: H2SO4<HCl. Also, it was found that, the P% of the S5 polymer is higher than that obtained for its monomer (M1). Adsorption of the titled polymer obeyed the isotherm of Langmuir and involves both chemical and physical adsorptions. Scanning electron microscopy (SEM) investigations established the protective layer formation from the studied polymer on the metal substrate and shield it from direct Cl- and/ or SO4 2- attack.
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Abou-Shanab, Reda A.I.,El-Dalatony, Marwa M.,EL-Sheekh, Mostafa M.,Ji, Min-Kyu,Salama, El-Sayed,Kabra, Akhil N.,Jeon, Byong-Hun 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.3
Coupling of advanced wastewater treatment with microalgae cultivation for low-cost lipid production was demonstrated in this study. The microalgal species Micractinium reisseri and Scenedesmus obliquus were isolated from municipal wastewater mixed with agricultural drainage. M. reisseri was selected based on the growth rate and cultivated in municipal wastewater (influent, secondary and tertiary effluents) which varied in nutrient concentration. M. reisseri showed an optimal specific growth rate (${\mu}_opt$) of 1.15, 1.04, and 1.01 1/day for the influent and the secondary and tertiary effluents, respectively. Secondary effluent supported the highest phosphorus removal (94%) and saturated fatty acid content (40%). The highest lipid content (40%), unsaturated fatty acid content, including monounsaturated and polyunsaturated fatty acids (66%), and nitrogen removal (80%) were observed for tertiary effluent. Fatty acids accumulating in the microalgal biomass (M. reisseri) were mainly composed of palmitic acid, oleic acid, linoleic acid, and ${\alpha}$-linolenic acid. Cultivation of M. reisseri using municipal wastewater served a dual function of nutrient removal and biofuel feedstock generation.
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Sayed, S.M.,El-Ella, Ghada A. Abou,Wahba, Nahed M.,Nisr, Neveen A. El,Raddad, Khaled,Rahman, M.F. Abd El,Hafeez, M.M. Abd El,Aamer, Ahmed Abd El Fattah The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.3
The objective of this work was to evaluate the potency of bee product-immunized rats to overcome an induced Staphylococcus aureus infection. Forty rats were divided to eight groups: T1, T3, and T5 received, respectively, fennel honey, ethanol, and aqueous propolis extracts orally, and T2, T4, and T6 were administered the respective materials intraperitoneally; T7 received bee venom by the bee sting technique; and T8 was the control group. All groups were challenged by a bovine clinical mastitis isolate of S. aureus. Each rat received 2mL of broth inoculated with $1{\times}10^5$ colony-forming units/mL intraperitoneally. Two weeks post-induced infection all rats were sacrificed and eviscerated for postmortem inspection and histopathological study. Three rats from T8 and one rat from T7 died before sacrifice. Another two rats, one each in T4 and T5, had morbidity manifestations. The remaining experimental animals showed apparently healthy conditions until time of sacrifice. Postmortem inspection revealed that all T8 rats showed different degrees of skeletal muscle and internal organ paleness with scattered focal pus nodules mainly on lungs and livers. All rats of the treated groups showed normal postmortem features except three rats. A dead rat in group T7 showed focal pus nodules on the lung surface only, whereas the affected two rats in groups T4 and T5 appeared normal except with some pus nodules, but much smaller than in the control, scattered on the hepatic surface and mesentery. Histopathological studies revealed that T8 rats had typical suppurative bronchopneumonia and or severe degenerative and necrobiotic changes in hepatic tissues. Three affected rats of the treated groups showed slight bronchopneumonia or degenerative hepatic changes only. The other animals of the treated groups showed completely normal parenchymatous organs with stimulated lymphatic tissues. It was concluded that all tested previously bee product-immunized rats could significantly challenge the induced S. aureus infection (P < .01). The effects were more pronounced in rats that had received fennel honey solution.
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S.M. Sayed,Ghada A. Abou El-Ella,Nahed M. Wahba,Neveen A. El Nisr,Khaled Raddad,M.F. Abd El Rahman,M.M. Abd El Hafeez,Ahmed Abd El Fattah Aamer 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.3
The objective of this work was to evaluate the potency of bee product-immunized rats to overcome an induced Staphylococcus aureus infection. Forty rats were divided to eight groups: T1, T3, and T5 received, respectively, fennel honey, ethanol, and aqueous propolis extracts orally, and T2, T4, and T6 were administered the respective materials intraperitoneally; T7 received bee venom by the bee sting technique; and T8 was the control group. All groups were challenged by a bovine clinical mastitis isolate of S. aureus. Each rat received 2mL of broth inoculated with 1×105 colony-forming units/mL intraperitoneally. Two weeks post-induced infection all rats were sacrificed and eviscerated for postmortem inspection and histopathological study. Three rats from T8 and one rat from T7 died before sacrifice. Another two rats, one each in T4 and T5, had morbidity manifestations. The remaining experimental animals showed apparently healthy conditions until time of sacrifice. Postmortem inspection revealed that all T8 rats showed different degrees of skeletal muscle and internal organ paleness with scattered focal pus nodules mainly on lungs and livers. All rats of the treated groups showed normal postmortem features except three rats. A dead rat in group T7 showed focal pus nodules on the lung surface only, whereas the affected two rats in groups T4 and T5 appeared normal except with some pus nodules, but much smaller than in the control, scattered on the hepatic surface and mesentery. Histopathological studies revealed that T8 rats had typical suppurative bronchopneumonia and or severe degenerative and necrobiotic changes in hepatic tissues. Three affected rats of the treated groups showed slight bronchopneumonia or degenerative hepatic changes only. The other animals of the treated groups showed completely normal parenchymatous organs with stimulated lymphatic tissues. It was concluded that all tested previously bee product-immunized rats could significantly challenge the induced S. aureus infection (P<.01). The effects were more pronounced in rats that had received fennel honey solution.
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M.M. El-Nahass,H.S. Metwally,H.E.A. El-Sayed,A.M. Hassanien 한국물리학회 2014 Current Applied Physics Vol.14 No.2
The JeV characteristics of the Au/5,10,15, 20-tetraphenyl-21H, 23H-porphine iron (III) chloride (FeTPPCl)/ ITO device exhibits rectifying behavior in the dark which can be explained due to the formation of Schottky barrier at ITO/FeTPPCl junction and the typical junction parameters were estimated in temperatures from 302 to 368 K. The temperature dependence of DC electrical conductivity showed that FeTPPCl films behave as semiconducting materials. These results indicate that the DC electrical conduction is through an activated process having three conduction mechanisms in the investigated range of temperatures. A variable range hopping model, a polaron model and band to band transitions have been used to explain the conduction mechanisms for FeTPPCl films.
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Synthesis of Certain 6-(Arylthio)uracils and Related Derivatives as Potential Antiviral Agents
El-Emam, Ali A.,Massoud, Mohamed A.M.,El-Bendary, Eman R.,El-Sayed, Magda A. Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.7
New series of 6-(arylthio)uracils, 6-(4-substituted-1-piperazinyl)uracils, 2,4,5-trioxo-1H,3H-benzothiopyrano[2,3-d]pyrimidine and 5-aryl-2,4-dioxo-1H,3H-pyrimido[5,4-f]benzo[1,4]thiazepines have been prepared and screened for their in vitro activity against herpes simplex-1 virus (HSV-1) and human immunodeficiency virus-1 (HIV-1). The in vitro cytotoxic activity was also evaluated. The results of biological testing revealed that compound 5b showed marginal activity against HSV-1, while compounds 5b and 5f exhibited marginal activity against HIV-1. The rest of the tested compounds were found devoid of antiviral activity against both HSV-1 and HIV-1.
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