http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Bahman Ebrahimi,Seyed Abbas Shojaosadati,Seyyed Mohammad Mousavi 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.3
A flow-through system based on acetylcholineesterase (AChE) was studied. The system was prepared by mixing AChE and a multiwall carbon nanotube (MWCNT). Two important parameters, the ratios of AChE:MWCNT (X1) and AChE-MWCNT:sol-gel (X2)were optimized using response surface methodology. The results revealed that an enzyme immobilized within the MWCNT-sol-gel was more effective compared to one conducted with sol-gel. The optimum feed flow rate was 0.4 mL/min and ATChI concentration was found to be 1 mM. The optimum ratios of X1 and X2 for immobilization on ceramic packing were 1.07 and 0.43, respectively. The sensitivity of this flow-through system was 1.82 × 10−5/μM and long-term stability analyzed after 120 days was 74% of initial absorbance. With respect to an incubation time of 14 min, the detection limit for paraoxon was 7.3 × 10−12 mol.
Bahman Nasiri-Tabrizi,Abbas Fahami,Reza Ebrahimi-Kahrizsangi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
In the present investigation the effects of milling parameters (time, atmosphere, and media) andchemical composition of raw materials on the mechanochemical synthesis of nanocrystallinehydroxyapatite (n-HAp) were studied. For a comparative study of the mechanically activated samplesversus thermally treated specimen (natural origin), n-HAp was also produced via annealing of bovinebone at 800℃ for 2 h. The gained powders exhibited average sizes about 32 and 27 nm under airatmosphere, and about 32 and 34 nm under argon atmosphere. TEM images confirmed the formation ofn-HAp with various morphologies under different experimental conditions.
Reflected shock tube experiments on aeroacoustic signature of hot jets
Iman Bahman Jahromi,Mohammad Ebrahimi,Kaveh Ghorbanian 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
We used a reflected shock tube to investigate the acoustic signature of a hot jet at the far-field. Experiments were performed at Mach = 1.4 and a total temperature of T t = 950 Kelvin. Far-field acoustic signatures of the hot jet at six polar angles θ = 15˚ to θ = 90˚ from the jet axis) were measured and imaged by the means of continuous wavelet transform in scalograms. The results were compared with experiments from a steady test facility at similar test conditions. Further, the primary characteristics of noise events in jet far-field were compared with analytical models considering wavepacket as the main source of jet noise. The results indicate that higher frequency events at θ = 90˚ occur with a small time shift relative to the low azimuthal mode base event. This phenomenon might be the main reason why the acoustic signal at the side angles behaves more noisily than at low polar angles.
Javad Saberi,Mojtaba Ansari,Bahman Ebrahimi Hoseinzadeh,Soheila Salahshour Kordestani,Seyed Morteza Naghib 한국섬유공학회 2018 Fibers and polymers Vol.19 No.12
Chitosan (Cs)-poly acrylic acid (PAA) complex nanoparticles well dispersed and stable in aqueous solution was prepared by free radical polymerization of acrylic acid monomers (AA) in the presence of chitosan (Cs). Different concentrations of Cs and AA was cross-linked to form scalable hybrid nanoparticles (HNP). The physicochemical characterization of nanopolymers was investigated using FTIR, dynamic light scattering (DLS) and scanning electron microscopy (SEM). Infrared spectroscopy and electronic microscopy analysis results showed the preparation of Cs-PAA hybrid nanoparticles due to the formation of polyelectrolyte complexes and their spherical shape, respectively. The average particle size obtained under 180 nm for all samples obtained by using DLS analysis. A dhesion strength for the samples with a ratio of Cs/AA 1: 1 and 0.2: 1 was 50 to 120 kPa and 120 to 230 kPa , respectively. Cytotoxicity assay (MTT) showed that cell activity for concentrations X/5 and X/10 was over 7 5 %, demonstrating the sample extracts have suitable cytocompatibility. In addition, hemolytic assay of the samples represents below 0.5 % (according to the standard) in damage extend to red blood cells. Furthermore, prepared tissue adhesive based on Cs-PAA hybrid NPs in terms of adhesion strength was competitive with commercial samples as well as satisfactory results in terms of biocompatibility and blood compatibility were achieved in comparison with commercial available adhesives based on cyanoacrylate.
Mohammad Reza Safaee-Ardakani,Ashrafalsadat Hatamian-Zarmi,Seyedeh Mahdieh Sadat,Zahra Beagom Mokhtari-Hosseini,Bahman Ebrahimi-Hosseinzadeh,Hamid Kooshki,Jamal Rashidiani 한국섬유공학회 2019 Fibers and polymers Vol.20 No.12
The use of natural polymers and electrospinning as a new method of wound dressing production is one of thethings that can revolutionize the medical world. Due to the importance of wound healing and characteristics such as antiinflammatoryand antimicrobial properties, it is possible to use natural compounds such as fungi and metabolites derivedfrom them to produce wound dressing. In this study, schizophyllan (SPG) as an extracellular polysaccharide was extractedfrom Iranian Schizophyllum commune (NCBI MG761830) and then the silver nanoparticles (AgNPs) were produced by thein-situ method in 1.5 % SPG solution. Afterward, they were combined with polyvinyl alcohol 10 % (PVA) polymer tostrengthen the fiber structure. We investigated the properties of nanofibers containing PVA/SPG-AgNPs and PVA/SPG20 %. The physicochemical properties of two fibers were investigated by SEM, TEM, FTIR, contact angle, water uptake,nanoparticle release, and biological test (antibacterial, and MTT). The diameter of the nanofiber-containing the AgNPs wasabout 169 nm and the other nanofiber was about 212 nm. The highest inhibition of the growth of the bacterium by PVA/SPGAgNPsagainst E. coli and S. aureus was about 88.34 % and 64.7 %, respectively. The silver ion release from PVA/SPGAgNPsnanofibers was 21 μg/ml after fifth day. Both nanofibers had no toxic effect on L929 fibroblast cells.