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- 저자 : Maryam Davari (검색결과 2 건)
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Ahmad Tavasoli,Saba Karimi,Maryam Davari,Nazanin Nasrollahi,Tahereh Nematian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
Alkalized MoS2 nanocatalysts supported on carbon nanotubes (CNTs) is prepared using microemultiontechnique with water-to-surfactant ratios of 1–4. The nanocatalysts were extensively characterized bydifferent methods and their activity and selectivity in higher alcohols synthesis (HAS) been assessed in afixed bed micro-reactor. The physico-chemical properties and performance of the nanocatalysts werecompared with the catalyst prepared by impregnation method. Very narrow particle size distributionhas been produced by the microemulsion technique at the relatively high loading of active metal(15 wt.% Mo). The TEM images showed that small Mo nanoparticles are confined inside the CNTs and theon the outer surface of the CNTs (2–7 nm). Using microemultion technique with water to surfactant ratioof one; the average MoO3 particle sizes decreased to 4.5 nm, the %dispersion increased to 60.75 and the%reduction increased by 43%. Also, the chemical interactions between K–Mo–O species increased,enhancing the conditions for the formation of alcohols. Activity and selectivity were found to bedependent on the catalyst preparation method and water to surfactant ratio. The %CO conversionincreased to 43.8%. The CNTs-supported MoO3–K2O nanocatalyst synthesized by the proposedmicroemulsion technique with water to surfactant ratio of one, decreased the hydrocarbons selectivityto 21.98% and increased the alcohols selectivity to 65.21%. Finally, using microemultion methoddramatically decreased the methanol selectivity and increased ethanol and other higher alcoholsselectivities.
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Jahromi, Bahia Namavar,Mosallanezhad, Zahra,Matloob, Najmeh,Davari, Maryam,Ghobadifar, Mohamed Amin The Korean Society for Reproductive Medicine 2015 Clinical and Experimental Reproductive Medicine Vol.42 No.3
Objective: In order to increase the number of mature oocytes usable for intracytoplasmic sperm injection (ICSI), we aimed to investigate the effect of co-culturing granulosa cells (GCs) on human oocyte maturation in vitro, the fertilization rate, and embryo development. Methods: A total of 133 immature oocytes were retrieved and were randomly divided into two groups; oocytes that were cultured with GCs (group A) and oocytes that were cultured without GCs (group B). After in vitro maturation, only oocytes that displayed metaphase II (MII) underwent the ICSI procedure. The maturation and fertilization rates were analyzed, as well as the frequency of embryo development. Results: The mean age of the patients, their basal levels of follicle-stimulating hormone, and the number of oocytes recovered from the patients were all comparable between the two study groups. The number of oocytes that reached MII (mature oocytes) was 59 out of 70 (84.28%) in group A, compared to 41 out of 63 (65.07%) in group B (p=0.011). No significant difference between fertilization rates was found between the two study groups (p=0.702). The embryo development rate was higher in group A (33/59, 75%) than in group B (12/41, 42.85%; p=0.006). The proportion of highest-quality embryos and the blastocyst formation rate were significantly lower in group B than in group A (p=0.003 and p<0.001, respectively). Conclusion: The findings of the current study demonstrate that culturing immature human oocytes with GCs prior to ICSI improves the maturation rate and the likelihood of embryo development.
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