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RISS 인기검색어
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- 저자 : Saeideh Rajabi (검색결과 2 건)
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Saeideh Rajabi,Hanieh Shaki 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
The performance of the prepared polyacrylonitrile (PAN) nanofiber membrane by electrospinning process for theremoval of lead and copper ions from aqueous solutions was investigated. The optimum electrospinning conditions wereobtained to be 14 wt% concentration, 20 kV voltages, 120 mm tips to collector distance and 0.8 ml h-1 flow rate. Chemicalfunctionalities were grafted by a two steps grafting process which involves hydrolysis and chemical modification withethyleneglycol (EG), ethylenediamine (EDA), diethylenetriamine (DTA). The prepared nanofibers were characterized byAttenuated total reflectance-Fourier transform infrared (ATR-FTIR), Scanning Electron Microscope (SEM), Atomic ForceMicroscopy (AFM), UV-Visible Spectrophotometer and Energy Dispersive X-ray Spectroscopy (EDS or EDX) analysis. Theadsorption capacity of Cu2+ and Pb2+ ions on modified PAN nanofiber mats were evaluated by atomic absorptionspectroscopy (AAS). Adsorption isotherms were used to find the model of the adsorption behavior and to calculate theremoval percentage. The results show that modified nanofibers with ethylenediamine have the maximum adsorption capacityabout of 22.954 mmol/gr and 12.367 mmol/gr for Cu2+ and Pb2+ ions, respectively. Therefore, these modified nanofibers openup delighted opportunities for the efficient removal of Pb2+ and Cu2+ from aqueous solutions.
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Hamidian, Saeideh,Talebi, Ali Reza,Fesahat, Farzaneh,Bayat, Mohammad,Mirjalili, Ali Mohammad,Ashrafzadeh, Hamid Reza,Rajabi, Mahya,Montazeri, Fateme,Babaei, Saeid The Korean Society for Reproductive Medicine 2020 Clinical and Experimental Reproductive Medicine Vol.47 No.1
Objective: Since sperm abnormalities are known to be a major reason for recurrent pregnancy loss (RPL), any defects in DNA structure and chromatin condensation can place embryos at risk in the early stage of development and implantation. As antioxidants such as vitamin C may play a protective role against the destruction of protamine genes in sperm chromatin, this study was conducted to evaluate the effects of vitamin C on chromatin and the expression of protamine genes in the male partners of couples with RPL. Methods: Twenty male partners of couples with RPL were selected as the intervention group and received vitamin C supplementation (250 mg daily for 3 months). Healthy fertile men (n = 20) were included as controls. Sperm chromatin, DNA integrity, and the expression levels of protamine genes were evaluated before and after treatment. Results: Significant differences were found in sperm morphology, protamine deficiency, and apoptosis between the two groups and before and after vitamin C administration. A significant change was found in mRNA levels of PRM1, PRM2, and the PRM1/PRM2 ratio after treatment. Conclusion: Daily oral administration of vitamin C may improve human sperm parameters and DNA integrity by increasing protamine gene expression levels in the male partners of couples with RPL. The beneficial effects of vitamin C supplementation as an antioxidant for the male partners of couples with RPL could lead to improved pregnancy outcomes in these cases.
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