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T. Amani,M. Nosrati,S.M. Mousavi 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.1
Anaerobic oxidation of volatile fatty acids (VFAs) as the key intermediates is restricted thermodynamically. Presently, enriched acetogenic and methanogenic cultures were used for syntrophic anaerobic digestion of VFAs in an upflow anaerobic sludge bed reactor fed with acetic, propionic, and butyric acids at maximum concentrations of 5.0, 3.0, and 4.0 g/L, respectively. Interactive effects of propionate, butyrate and acetate were analyzed. Hydraulic retention time (HRT) and acetate oxidizing syntrophs and methanogen (hydrogenotrophs) to syntrophic bacteria (propionate- and butyrate-oxidizing bacteria)population ratio (M/A) were investigated as key microbiological and operating variables of VFA anaerobic degradations. M/A did not affect the size distribution and had little effect on extracellular polymer contents of the granules. Granular sludge with close spatial microbial proximity enhanced syntrophic degradation of VFAs compared to other cultures, such as suspended cultures. Optimum conditions were found to be propionate = 1.93 g/L, butyrate =2.15 g/L, acetate = 2.50 g/L, HRT = 22 h, and M/A = 2.5corresponding to maximum VFA removal and biogas production rate. Results of verification experiments and predicted values from fitted correlations were in close agreement at the 95% confidence interval. Granules seemed to be smaller particles and less stable in construction with an irregular fractured surface compared to the original granules.
Thermal Dissociation and Conformational Lock of Superoxide Dismutase
Hong, J.,Moosavi-Movahedi, A.A.,Ghourchian, H.,Amani, M.,Amanlou, M.,Chilaka, F.C. Korean Society for Biochemistry and Molecular Biol 2005 Journal of biochemistry and molecular biology Vol.38 No.5
The kinetics of thermal dissociation of superoxide dismutase (SOD) was studied in 0.05 M Tris-HCl buffer at pH 7.4 containing $10^{-4}\;M$ EDTA. The number of conformational locks and contact areas and amino acid residues of dimers of SOD were obtained by kinetic analysis and biochemical calculation. The cleavage bonds between dimers of SOD during thermal dissociation and type of interactions between specific amino acid residues were also simulated. Two identical contact areas between two subunits were identified. Cleavage of these contact areas resulted in dissociation of the subunits, with destruction of the active centers, and thus, lost of activity. It is suggested that the contact areas interact with active centers by conformational changes involving secondary structural elements.
El Nemr Ahmed,Aboughaly Rawan M.,El Sikaily Amany,Masoud Mamdouh S.,Ramadan Mohamed S.,Ragab Safaa 한국탄소학회 2022 Carbon Letters Vol.32 No.1
Sugarcane bagasse has been used as a substrate for the development of microporous nano-activated carbons for the treatment and elimination of dissolved materials from aquatic environment. The activated carbon was produced using chemical activation in one-step method with zinc chloride (ZnCl2) as the activating agent at a carbonization temperatures range from 500 to 900 °C. The effects of temperature and time of carbonization on the activated carbon product properties were thoroughly studied. The activated carbons that resulted were characterized using the N2 adsorption/desorption isotherms, Brunauer–Emmett–Teller method (BET), pore property analysis, micropore (MP) surface area, t-plot surface area, TGA, FTIR, SEM, TEM, and EDX analyses. The prepared activated carbon's point of zero charge, Boehm titration process, iodine removal percentage, and methylene blue number were also investigated. The prepared activated carbon's maximum surface area was achieved using a 2/1 impregnation ratio (dried sugarcane bagasse/ZnCl2) at 600 °C temperature of carbonization and 60 min residence time. 1402.2 m2/g, 0.6214 and 1.41 cm3/g, respectively, were the largest surface area, total pore volume, and micropore volume. As the activation temperature increased, the total pore volume increased and the BET study measured a pore diameter of 0.7 nm and a mean pore diameter of 1.77 nm.
Development of electroless Ni–P modified aluminum substrates in a simulated fuel cell environment
Amani E. Fetohi,K.M. El-Khatib,R.M. Abdel Hameed 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
The corrosion resistance of electroless Ni–P coating on pure Al, Al 6061, Al 3004 and Al 1050 is examinedin an environment simulated to PEM fuel cell. Potentiodynamic polarization techniques, Interfacialcontact resistance, surface morphology, chemical composition of coated substrates and EISmeasurements have been investigated. Modified Al 1050 showed reduction in its corrosion currentdensity by 44.69 times. It also showed the best stability of all modified Al substrates. The formed Ni–Player on Al 1050 is thicker by about 3 times, relative to that on Al 6061 and has higher Ea value of135.68 kJ mol 1 supporting its lower corrosion rate.
Constitutive flavonoids of the flowers of Tamarix tetragyna
Amani M. D. ElMousallamy,Sayed A. Ahmed 한국생약학회 2000 Natural Product Sciences Vol.6 No.2
A phytochemical investigation of the aqueous ethanolic flower extract of Tamarix tetragyna led to the isolation and characterization of the hitherto unknown conjugates, kaempheride 3,7-dipotassium sulphate and kaempferol 3,4`-dipotassium sulphate as well. Twelve known flavonol compounds, including kaempheride 3-potassium sulphate and kaempheride 3-O-β-glucuronide were also isolated and identified. ¹H- and <sup>13</sup>C-NMR spectra for the known kaempheride derivatives have been recorded and assigned for the first time. Structures of all compounds were established by conventional methods of analysis and confirmed by ¹H-, <sup>13</sup>C-NMR and mass spectral analysis.
Chemical Investigation of the Constitutive Flavonoid Glycosides of the Leaves of Crataegus sinaica
Amani M. D. El-Mousallamy 한국생약학회 1998 Natural Product Sciences Vol.4 No.2
Leaves of Crataegus sinaica Boiss, contain the new C-glycosyl flavone 3$quot;`,4$quot;`-di-O-acetyl-2$quot;-O-α-rhamnosylvitexin, together with the hitherto unknown, dihydroflavonol 3-O-xyloside, (2R:3R)-dihydroquercetin-3-O-β-xylopyranoside. The known compounds (+)-catechin, (-)-epicatechin, vicenin-II, 2$quot;-O-α-rhamnosylvitexin, and 4$quot;`-O-acetyl-2$quot;-O-α-rhamnosylvitexin were also characterized. Structures were established by conventional methods of analysis and confirmed by ¹H-, <sup>13</sup>C-NMR, and ESI-MS.
Ahmed M. A. Souleman,Amani M. D. El-Mousallamy 한국생약학회 2000 Natural Product Sciences Vol.6 No.2
The aqueous ethanolic whole plant extract of Rosa arabica was found to contain the new natural dimeric phenolic compound, ellagic acid 3,3`-dimethyl ether 4-O-α-rhamnopyranoside, 9, along with ten known phenolic metabolites (1-8, 10 and 11). Structures of all compounds (1-11) were established by routine methods of analysis and confirmed by FAB-MS, ¹H and <sup>13</sup>C NMR spectral analysis.
Samy M. Mostafa,Ola W. Abd El-Baseer,D. L. Shi,Amany M. Menshawy,Kul Hur 원광대학교 기초자연과학연구소 2024 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.27 No.2
A picture fuzzy set is one of the generalizations of Atanassove's (IFSs) fuzzy set. Under this environment, in this manuscript, we familiarize a new type of extensions of fuzzy sets called cubic root fuzzy sets (briefly, $\sqrt[3]{\cdot}$-Fuzzy sets) and Fermatean fuzzy sets to contrast $(3,3,\sqrt[3]{\cdot})$-picture sets. We introduce the notion of $(3,3,\sqrt[3]{\cdot})$-picture fuzzy $BCC$-ideals of $BCC$-algebras. After then, we study the homomorphic image and inverse image of $(3,3,\sqrt[3]{\cdot})$-picture fuzzy $BCC$-ideals under homomorphism of $BCC$-algebras. Moreover, the Cartesian product of $(3,3,\sqrt[3]{\cdot})$-picture fuzzy $BCC$-ideals of $BCC$-algebras is given. Finally, we introduce the concept of correlation for $(3,3,\sqrt[3]{\cdot})$-picture fuzzy sets, which is a new extension of the correlation of Atanassove's IFSs and investigated several properties.
N.M. Khalil,M.M.S. Wahsh,Amany Gaber 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
Vitreous ceramic tiles were produced from clay, quartz and albite mixtures fired at 1150 oC. These ceramic tiles were classifiedaccording to the ISO standard. The effect of fluxes additions on the technological properties of ceramic tiles has been studied. The sintering behavior (linear shrinkage, water absorption, apparent porosity and bulk density) of the prepared ceramicbodies was followed. Phase compositions and microstructure were characterized by X-ray diffraction (XRD) and scanningelectron microscope (SEM) attached with an EDAX unit. The densification parameters and hence mechanical properties ofthe samples were enhanced with increasing of albite content up to 40 wt. % due to liquid phase sintering mechanism. However,higher amount of fluxes above the vitrification range (> 40 wt.%) results in a noticeable decrease in the sintering andmechanical properties.