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Nafiseh Tavakolpoor Saleh,Alireza Naderi Sohi,Elaheh Esmaeili,Somayeh Karami,Fatemeh Soleimanifar,Nikoo Nasoohi 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.6
Due to number of reasons such as ease of isolation and their broad differentiation capability, adult human mesenchymal stem cells (MSCs) are widely considered as of the most promising cells for regenerative medicine and tissue engineering. Nevertheless quick decrease in expression of transcription factors associated with stemness and self-renewal during ex vivo expansion of MSCs is an impediment against their therapeutic applications. Since the influence of extra cellular matrix (ECM) proteins on the fate of stem cells is well documented, the culture of MSCs on ECM-derived synthetic biomolecules is worth investigating. In the present study, a lamininderived peptide, YIGSR was covalently immobilized on the chitosan film surface using carbodiimide chemistry and confirmed by fluorometry. The results obtained from surface characterization by atomic force microscopy (AFM) and contact angle measurement, showed no significant difference in topological features and hydrophilicity after peptide immobilization. Employment of these surfaces for culture of human adipose-derived mesenchymal stem cells demonstrated that the immobilized YIGSR peptide has a favorable effect on adhesion and maintaining viability of the MSCs as well as on the expression of stemness markers (Nanog, Oct-4, and Sox-2) in these cells.
Hassan Pahlavanzadeh,Amideddin Nouralishahi,Mohammadmehdi Choolaei,Elaheh Esmaeili,Amir Yadegari 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.6
An optimal oxygen concentration trajectory in an isothermal OCM plug flow reactor for maximizing C2production was determined by the algorithm of piecewise linear continuous optimal control by iterative dynamic programming (PLCOCIDP). The best performance of the reactor was obtained at 1,085 K with a yield of 53.9%; while,at its maximum value, it only reached 12.7% in case of having no control on the oxygen concentration along the reactor. Also, the effects of different parameters such as reactor temperature, contact time, and dilution ratio (N2/CH4) on the yield of C2 hydrocarbons and corresponding optimal profile of oxygen concentration were studied. The results showed an improvement of C2 production at higher contact times or lower dilution ratios. Furthermore, in the process of oxidative coupling of methane, controlling oxygen concentration along the reactor was more important than controlling the reactor temperature. In addition, oxygen feeding strategy had almost no effect on the optimum temperature of the reactor. Finally, using the optimal oxygen strategy along the reactor has more effect on ethylene selectivity compared to ethane.
Application of palladium supported on functionalized MWNTs for oxidative desulfurization of naphtha
Neda Mohammadi Meman,Bahman ZareNezhad,Alimorad Rashidi,Zeinab Hajjar,Elaheh Esmaeili 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
In this research, Pd supported multi wall carbon nanotube(MWNT) nano catalyst prepared in previous work used for investigation the efficiency of an oxidative desulfurization (ODS) process in sulfur reduction from naphtha. Palladium (Pd) supported on functionalized multi-walled carbon nanotubes (FMWNTs) have been found to be effective in catalyzing oxidation of the sulfur impurities in naphtha to corresponding sulfones. a catalyst of 0.1%wt Pd on FMWNT as a support synthesized by impregnation method and was characterized by TEM, X-ray Diffraction (XRD), TPR and BET analysis. oxidative desulfurization reaction was done at 25 °C in atmospheric pressure under reaction condition of VH2O2 = 2 mL and Fuel/solvent molar ratio = 2. We also applied our catalyst in oxidative desulfurization reaction of naphtha (with sulfur contents 870 ppm), and more than 90% of sulfur was removed from naphtha under mild reaction conditions.
Application of palladium supported on functionalized MWNTs for oxidative desulfurization of naphtha
Neda Mohammadi Meman,Bahman ZareNezhad,Alimorad Rashidi,Zeinab Hajjar,Elaheh Esmaeili 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In this research, Pd supported multi wall carbon nanotube(MWNT) nano catalyst prepared in previouswork used for investigation the efficiency of an oxidative desulfurization (ODS) process in sulfurreduction from naphtha. Palladium (Pd) supported on functionalized multi-walled carbon nanotubes(FMWNTs) have been found to be effective in catalyzing oxidation of the sulfur impurities in naphtha tocorresponding sulfones. a catalyst of 0.1%wt Pd on FMWNT as a support synthesized by impregnationmethod and was characterized by TEM, X-ray Diffraction (XRD), TPR and BET analysis. oxidativedesulfurization reaction was done at 25 8C in atmospheric pressure under reaction condition of VH2O2 =2 mL and Fuel/solvent molar ratio = 2.We also applied our catalyst in oxidative desulfurization reactionof naphtha (with sulfur contents 870 ppm), and more than 90% of sulfur was removed from naphthaunder mild reaction conditions.