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RISS 인기검색어
- 검색키워드
- 저자 : Abbas Ali Khodadadi (검색결과 4 건)
- 무료
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Hengameh Fatemi,Abbas Ali Khodadadi,Azam Anaraki Firooz,Yadollah Mortazavi 한국물리학회 2012 Current Applied Physics Vol.12 No.4
Biomorphic porous ZnO nanostructures were successfully synthesized via an aqueous solegel soaking process using pieces of apple flesh and skin as templates and employed for glucose direct electrochemical biosensor. The structure and morphology of ZnO nanostructures were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). By modifying glassy carbon electrode with the biomorphic ZnO nanostructures and Nafion, two glucose biosensors were constructed and their direct electrochemistry of glucose oxidase (GOD) was successfully investigated by cyclic voltammetry (CV). The biomorphic porous ZnO nanostructures using apple skin template (S-ZnO) were more effective in facilitating the electron transfer of immobilized GOD than that of using flesh apple template (F-ZnO). This may be a result of the unique morphology and smaller average crystallite size of the S-ZnO nanostructure. GOD immobilized on Nafion-porous S-ZnO nanostructure composite display direct, reversible,and surface-controlled redox reaction with a detection limit of 10 mM, a response time of 7 s, high sensitivity of 23.4 mA/mM cm2 and a fast heterogeneous electron transfer rate with a rate constant (ks) of 3.9 s-1. It was found that S-ZnO significantly has improved the direct electron transfer between GOD and glassy carbon electrode with good stability and reproducibility. Biomorphic porous ZnO nanostructures were successfully synthesized via an aqueous solegel soaking process using pieces of apple flesh and skin as templates and employed for glucose direct electrochemical biosensor. The structure and morphology of ZnO nanostructures were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). By modifying glassy carbon electrode with the biomorphic ZnO nanostructures and Nafion, two glucose biosensors were constructed and their direct electrochemistry of glucose oxidase (GOD) was successfully investigated by cyclic voltammetry (CV). The biomorphic porous ZnO nanostructures using apple skin template (S-ZnO) were more effective in facilitating the electron transfer of immobilized GOD than that of using flesh apple template (F-ZnO). This may be a result of the unique morphology and smaller average crystallite size of the S-ZnO nanostructure. GOD immobilized on Nafion-porous S-ZnO nanostructure composite display direct, reversible,and surface-controlled redox reaction with a detection limit of 10 mM, a response time of 7 s, high sensitivity of 23.4 mA/mM cm2 and a fast heterogeneous electron transfer rate with a rate constant (ks) of 3.9 s-1. It was found that S-ZnO significantly has improved the direct electron transfer between GOD and glassy carbon electrode with good stability and reproducibility.
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Ashkan Karbasi,Ali Abbasi,Abbas Mohagheghi,Jalal Poorolajal,Farzad Emami,Shirin Moradkhani,Iraj Khodadadi,Mahmoud Gholyaf,Heidar Tavilani 전남대학교 의과학연구소 2024 전남의대학술지 Vol.60 No.1
Contrast-induced acute kidney injury (CI-AKI) is a frequent challenge following the injection of contrast media and its subsequent oxidative stress. The aim of the present study was to evaluate the preventive effects of coenzyme Q10 (Q10), as a mitochondrial-targeted antioxidant in CI-AKI in diabetic patients, who account for a large proportion of angiographic cases. A total of 118 diabetic patients were randomly assigned to receive 120 mg of oral coenzyme Q10 (Q10 group) or placebo (Placebo group) for four days, starting 24 hours before contrast media injection. Blood urea nitrogen (BUN), serum and urinary creatinine, estimated glomerular filtration rate (eGFR), urinary malondialdehyde (UMDA), urinary total antioxidant capacity (UTAC), and urinary mitochondrial to nuclearDNA ratios (mtDNA/nDNA ratio) were evaluated before and after the treatment period. Urine sediments were also evaluated to report the urine microscopy score (UMS).The levels of BUN, serum and urine creatinine, and UMS were similar in the Q10 and placebo groups. EGFR was lower in the Q10 group before the treatment (p=0.013) but not after. The urinary mtDNA/nDNA ratio was 3.05±1.68 and 3.69±2.58 in placebo and Q10 groups, but UTAC was found to be lower in Q10 both before (p=0.006) and after the treatment (p<0.001). The incidence of CI-AKI was 14.40% and the mtDNA/nNDA ratio was similar between CI-AKI and non-CI-AKI patients. In conclusion, Q10 treatment shows no favorable effect on prevention of CI-AKI or a urinary mtDNA/nDNA ratio among diabetic patients.
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Mahdi Davoodpour,Reza Tafreshi,Abbas Ali Khodadadi,Yadolla Mortazavi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
A novel bilayer catalyst composed of amorphous silica-alumina (ASA) layer coated on Y zeolite layer is proposed as a fluid catalytic cracking (FCC) catalyst to cause two-stage reactions of pre-cracking and deep-cracking. The bilayer catalyst (Y/ASA) is compared with the usual mixed one (ASA+Y), in catalytic cracking of a feed composed of 1,3,5-triisopropylbenzene and naphthalene. The two catalyst representations were prepared by applying layers of Y zeolite and ASA or both on inert monolith supports. Catalytic cracking experiments were carried out at 300, 350 and 400 oC. Compared to Y+ASA, Y/ASA yielded about 33% and 46% more benzene and toluene, respectively, and 18% less coke in the catalytic cracking at 350 oC. The coke of Y/ASA was less refractory than that of Y+ASA as burnt at lower temperatures, while emitting less carbon monoxide in regeneration. Y/ASA configuration shows promising features as FCC catalysts for increased bottoms cracking and suppressed coking.
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Akbar Zamaniyan,Yadollah Mortazavi,Hossein Manafi,Abbas Ali Khodadadi 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.4
A novel catalyst shape for reforming reaction, as an intraparticle diffusion limited-reaction, using bulk monolithic catalyst (BMC), the so-called tube fitted bulk monolithic catalyst (TFBMC), instead of conventional pellets is presented. A detailed analysis of the transport phenomena and proper models are introduced. The model is applied for natural gas reforming reaction and validated using industrial data. Then comparative model analysis and comparison for packed bed rector using conventional pellet shapes and TFBMC is presented. The results indicate that the TFBMC has superior advantages over the conventional pellet shapes especially with regards to the pressure drop and effective usage of the catalyst. Thus, TFBMC offer smaller reactor volume for processing similar feed flow which in turn results in less capital cost and also energy saving in the course of operation. Moreover, the TFBMC concept may be easily adapted to the present fixed bed reactors which use conventional pellet catalysts resulting more productivity and better performance.
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