Islamic Azad University at Shahre Qods

www.shahryariau.ac.ir
Tehran, Iran
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Keyvani H.,Tehran University of Medical Sciences | Bokharaei-Salim F.,Tehran University of Medical Sciences | Monavari S.H.,Tehran University of Medical Sciences | Esghaei M.,Tehran University of Medical Sciences | And 4 more authors.
Hepatitis Monthly | Year: 2013

Background: Occult hepatitis C virus (HCV) infection is a new entity described by the presence of HCV-RNA in liver biopsy and/or peripheral blood mononuclear cell (PBMC) specimens, and undetectable levels or absence of HCV-RNA and in the absence or presence of anti HCV antibodies in plasma by current laboratory methods. Objectives: To evaluate the detection of HCV-RNA in PBMC specimens of the liver transplant candidates with cryptogenic cirrhosis by reverse transcriptase-nested polymerase chain reaction (RT-nested PCR). Patients and Methods: From November 2007 to March 2013, 45 patients from Liver Transplant Center of Imam Khomeini Hospital, Tehran, were enrolled in this cross sectional study. PBMC specimens were separated from the peripheral blood sample. After extraction of RNA from plasma and PBMC specimens, HCV-RNA status was tested by RT-nested PCR. The 5′-untranslated region (5′-UTR) genotyping of HCV-RNA amplified from PBMC specimens was performed by a standard methodology with the INNO-LiPATM HCV II kit. The PCR products of 5′-UTR were sequenced after cloning into the pJET1.2 / blunt cloning vector. Results: Of 45 patients, 4 (8.9% [95% CI: 4.4-15.6]) had detectable genomic HCV-RNA in their PBMC specimens. HCV genotypes were determined in the PBMCs of these subjects showed that 2 (50.0%) subjects with occult HCV infection had HCV subtype 3a, and 2 (50.0%) had HCV subtype 1b. Conclusions: This study found that 8.9 % of the Iranian candidates for liver transplant with cryptogenic cirrhosis had occult HCV infection. Therefore, designing prospective studies focusing on the diagnosis of occult HCV infection in these subjects prior to liver transplantation could be valuable. © 2013, Kowsar Corp.; Licensee Kowsar Ltd.


Savaloni H.,University of Tehran | Farid-Shayegan F.,Islamic Azad University at Shahre Qods
Vacuum | Year: 2010

Titanium films of different thicknesses were deposited on glass substrates, using planar magnetron sputtering at 313 K substrate temperature. Their optical properties were measured by spectrophotometry in the spectral range of 200-2500 nm. Kramers-Kronig method was used for the analysis of the reflectivity curves of Ti films to obtain the optical constants of the films. In order to compare the influence of thickness of Ti films prepared using two different PVD methods, namely sputtering and electron gun depositions on the optical properties of Ti films, the optical results of Savaloni and Kangarloo (2007) for Ti films produced using electron gun deposition under UHV condition at 313 K substrate temperature are incorporated in this work. The analysis of the residual stress in the sputter deposited films using sin2 ψ technique and the nano-strain in the E. Gun deposited films obtained from X-ray diffraction line broadening analysis (Warren-Averbach method) showed consistency with the results obtained for optical functions and agreed well with the predictions of both structural zone model (SZM) and effective medium approximation (EMA) results. Therefore, a direct correlation between the optical properties and the processes involved in the evolution of thin films is established. The optical data, in particular the conductivity results for sputter deposited Ti films show more agreement with those of bulk sample (Lynch et al., 1975), while those of UHV E. Gun deposited films are more consistent with those of thin film sample (Johnson and Christy, 1974). © 2010 Elsevier Ltd. All rights reserved.


Moradi O.,Islamic Azad University at Shahre Qods | Yari M.,Islamic Azad University | Moaveni P.,Islamic Azad University at Shahre Qods | Norouzi M.,Tehran University of Medical Sciences
Fullerenes Nanotubes and Carbon Nanostructures | Year: 2012

Adsorption of p-nitrophenol and naphthalene in single aqueous solution from petrochemical wastewater by single-walled carbon nanotubes (SWCNTs) and functionalized single-walled carbon nanotubes having covalent attachments of carboxylic groups (SWCNT-COOH) has been considered. Removal behavior of p-nitrophenol and naphthalene by SWCNTs and SWCNT-COOH surfaces was studied by varying the parameters such as agitation time, initial concentration, and pH of solution. The presence of surface functional groups affected the adsorption capacity of SWCNTs and SWCNT-COOH surfaces for removal of p-nitrophenol and naphthalene in single aqueous solution from petrochemical wastewater. Kinetic studies were performed and pseudo-second-order kinetic model successfully represented the kinetic data. The Langmuir and Freundlich adsorption isotherms were used for description of adsorption equilibrium, and it was found that the experimental data fitted well with the Langmuir model. The results of the study show that the carbon nanotubes can be used as potential adsorbent for petrochemical wastewater. © 2011 Taylor & Francis Group, LLC.


Namdjoyan S.,Islamic Azad University at Shahre Qods | Kermanian H.,Shahid Beheshti University
Scientia Horticulturae | Year: 2013

This research investigated the effects of exogenous sodium nitroprusside (SNP) supplementation as a nitric oxide (NO) on alleviating arsenic-induced oxidative damage in watercress (Nasturtium officinale R. Br.) plants. In arsenic-treated plants, dry weight of roots and shoots and chlorophyll content of leaves markedly decreased, while application of 100μM SNP, alleviated the inhibitory effect of arsenic on plant growth and chlorophyll content in arsenic-treated plants. Treatment with 100μM SNP considerably reduced root-to-shoot translocation of arsenic and increased slightly the protein and proline content in watercress tissues. Level of oxidative markers (lipoxygenase activity and malondialdehyde (MDA) and H2O2 content) sharply increased in arsenic-treated plants. Upon application of SNP this trend was alleviated; however, the activities of enzymatic antioxidants increased when plants were subjected to arsenic stress in combination with SNP. Results obtained in the present study suggest that exogenous NO could alleviate negative effects of arsenic on watercress plants probably through its ability to the stimulation of reactive oxygen species (ROS)-scavenging enzymes activity and/or direct scavenging of superoxide onion. © 2013 Elsevier B.V.


Sefidi F.J.,Tehran University of Medical Sciences | Keyvani H.,Tehran University of Medical Sciences | Monavari S.H.,Tehran University of Medical Sciences | Alavian S.M.,Baqiyatallah Research Center for Gastroenterology and Liver Diseases | And 2 more authors.
Hepatitis Monthly | Year: 2013

Background: Hepatitis C virus (HCV) has different genotypes throughout the world. Since the determination of which antiviral treatment to be applied is related to HCV genotypes, identification of an individual's HCV genotypes prior to antiviral therapy is critical. Objectives: The purpose of this study was to investigate the distribution of HCV genotypes in a large population of Iranian HCV infected patients. Patients and Methods: Eleven thousand, five hundred and sixty one patients with chronic HCV infection which referred to hospitals related to the Tehran University of Medical Sciences and Tehran Hepatitis Center-Clinical Department of Baqiyatallah Research Center for Gastroeneterology and Liver Disease from March 2003 to December 2011 were enrolled. Following extraction of viral RNA of the serum, HCV-RNA was detected using reverse transcriptase-nested polymerase chain reaction (RT-nested PCR) and then HCV genotypes analyzed by restriction fragment length polymorphism (RFLP) assay. Results: The mean age of patients was 37.6 ± 14.2 years (range: 1-87). The highest frequency was noted for subtype 1a (44.9%) followed by subtype 3a (39.6%), and 1b (11.3%). Mixed HCV genotypes were also found in 2.5% of the total cases. Subtype 1a was the most frequent genotype in patients over 40 years of age (46.1% versus 42.4%) and subtype 3a was the most frequent in patients under 40 years old (41.5% versus 38.9%). Conclusions: This study suggested that the dominant HCV subtype among Iranian patients was 1a followed by subtype 3a. © 2013, Kowsar Corp.


Amani J.,Islamic Azad University at Shahre Qods | Musavi S.M.,University of Tabriz
Tetrahedron | Year: 2011

DFT calculations are employed to compare and contrast six-membered ring carbenes including 1,3-dimethyltetrahydropyrimidin-2-ylidene (1a), 1-methyl-3-cyclopropyltetrahydropyridine-2-ylidene (2a), and 1,3-dicyclopropylcyclohexane-2-ylidene (3a) as well as their unsaturated analogues 1b, 2b, 3b, and 2c. The amino groups exert singlet-triplet energy separation (Es-t) of 60.9 kcal/mol to 1a while cyclopropyls induce a Es-t of 14.8 kcal/mol to 3a. The simultaneous presence of amino and cyclopropyl in 2a leads to a Es-t of 43.3 kcal/mol. Unsaturation slightly increases the Es-t of 1a and 3a but not that of 2a. Our thermodynamic, kinetic, and reactivity results are compared with those of synthetic five-membered ring N-heterocyclic carbenes. © 2010 Elsevier Ltd. All rights reserved.


Moradi O.,Islamic Azad University at Shahre Qods
Chemical and Biochemical Engineering Quarterly | Year: 2011

In this studies removal of some ions such as Pb(II), Cd(II) and Cu(II) by single walled carbon nanotubes (SWCNTs) and carboxylate functionalized (SWCNTs-COOH) from aqueous solution were studied. The effect of pH, contact time, initial concentration, ionic strength, temperature, equilibrium, models and thermodynamic parameters on the removal of ions was investigated. The results indicated that Langmuir fits adsorption isotherm data better than Freundlich model. The results also demonstrated that SWCNTs-COOH can remove ions more effectively. Maximum adsorption capacities for Pb(II), Cu(II) and Cd(II) ions on SWCNTs-COOH were obtained as 96.02, 77.00 and 55.89 mg g -1, respectively and by SWCNTs, as 33.55, 24.29 and 24.07 mg g -1, respectively. Thermodynamic parameters values showed that the adsorption of ions on SWCNTs-COOH and SWCNTs at 283-313 K are spontaneous and endothermic. Further, adsorption of ions by SWCNTs-COOH and SWCNTs are chemisorption and physisorption processes, respectively.


Moradi O.,Islamic Azad University at Shahre Qods | Maleki M.S.,Islamic Azad University at Shahre Qods
Fullerenes Nanotubes and Carbon Nanostructures | Year: 2013

The present study reports the treatment of synthetic dairy wastewater in terms of chemical oxygen demand removal by means of adsorption onto multi-walled carbon nanotube. The effects of contact time, initial concentration, temperature, adsorbent dosage and pH on the removal of dairy wastewater were also investigated. The equilibrium data were analyzed by the Langmuir, Freundlich, Temkin, Handersen, and Harkins-jura, and Halsey models, which revealed that Langmuir model is more suitable to describe the dairy wastewater adsorption than other models. © 2013 Copyright Taylor and Francis Group, LLC.


Moradi O.,Islamic Azad University at Shahre Qods | Maleki M.S.,Islamic Azad University at Shahre Qods | Tahmasebi S.,Islamic Azad University at Shahre Qods
Fullerenes Nanotubes and Carbon Nanostructures | Year: 2013

In this research, a Bovine Serum Albumin (BSA) experiment was carried out and the produced BSA used to investigate the adsorption behavior of BSA from aqueous solutions by single-walled carbon nanotubes (SWCNTs) and Gold Nanoparticles (GNPs) through UV-Vis spectroscopy. The change of the parameter of contact time was tested in several adsorption experiments. The kinetic data indicate that the adsorption fits well with the pseudo first-order kinetic model for BSA adsorbed by GNPs and for SWCNTs was intraparticle diffusion model. © 2013 Copyright Taylor & Francis Group, LLC.


Moradi O.,Islamic Azad University at Shahre Qods
Fullerenes Nanotubes and Carbon Nanostructures | Year: 2013

In this study, the adsorption behavior of Basic Red 46 (BR 46) in aqueous solutions by single-walled carbon nanotube (SWCNTs) and functionalized SWCNTs having covalent attachments of carboxylic group (SWCNT-COOH) surface as adsorbents were investigated. The adsorption equilibrium data were analyzed using various adsorption isotherms, and the results have shown that adsorption behavior of BR 46 could be described reasonably well by a generalized isotherm. Kinetic studies indicated adsorption of BR 46 by SWCNTs and SWCNT-COOH surfaces follows a pseudo-order model. The maximum adsorption capacities of BR46 by SWCNTs and SWCNT-COOH surfaces are reported at 298 K, 38.35 and 49.45 mg/g, respectively. The adsorption of BR 46 depends on the initial pH of the solution with maximum uptake occurring at about pH 9. Decrease in the absolute value of ΔG 0 with increasing temperature indicates that higher temperatures hardship the adsorption. The negative value of ΔH 0 reflects an exothermic adsorption and indicates that the adsorption is favored at low temperature. The negative entropy states that the adsorption of BR 46 by SWCNT-COOH and SWCNTs surfaces are orderly adsorbed by the surfaces. © Taylor & Francis Group, LLC.

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