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Search Results: 1 - 10 of 3410 matches for " Mohsen Soltani Gerd Faramarzi "
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Cerebrospinal Fluid Concentration of Interleukin-6 and Interleukin-10 in Idiopathic Intracranial Hypertension
Hamed ReihaniKermani,Mohsen Soltani Gerd Faramarzi,Mehdi Ansari,Alireza Ghafarinejad
Journal of Medical Sciences , 2008,
Abstract: The aim of investigation was to determine interleukin-6 (IL-6; a proinflammatory cytokine) and IL-10 (an anti-inflammatory cytokine) concentrations in cerebrospinal fluid (CSF) of Idiopathic Intracranial Hypertension patients (IIH). The study covered 28 middle aged female (IIH patients, n = 14; controls, n = 14). CSF IL-6 and IL-10 concentration were determined by the use of commercial enzyme-linked immunosorbent assay (ELISA) kits. Concentration of IL-6 and IL-10 in CSF of IIH patients was 23.6±3.46 pg mL 1 and 3.7±0.5 pg mL 1 and in controls was 1.8±1.9 and 4.0±1.0 pg mL 1, respectively. Elevated IL-6 concentration in IIH patients found to be statistically significant in comparison to controls (p<0.05). There was no significant difference of IL-10 in IIH and controls. Role of immune system and inflammatory processes in etiology and pathogenesis of IIH must be taking into account.
A comperative study on quality changes in positive, negative and combined switching strategies in control of three Phase Matrix Converter
Mohammad Sarvi, Iman Soltani,Hossein Faramarzi
International Journal of Mechatronics, Electrical and Computer Technology , 2013,
Abstract: In this paper has used positive, negative and combined switching strategies for three phase ac/ac matrix converter.the author compares these strategies. The performance comparison of these three strategies is made under balanced operation. The simulation of three phase matrix converter feeding a three phase load was accomplished by means of the matlab/simulink software. After the simulation the comparison of the waveforms THD in three switching sequence is done. It must be mentioned that the duty cycle of the whole switches in the converter is according to Venturini switching algorithm.
Analysis of Extreme Precipitation Events over Central Plateau of Iran  [PDF]
Iman Rousta, Mohsen Soltani, Wen Zhou, Hoffman H. N. Cheung
American Journal of Climate Change (AJCC) , 2016, DOI: 10.4236/ajcc.2016.53024
Abstract: This paper describes the results of an analysis of extreme rainfall events in the central plateau of Iran. To study the extreme events, daily records of eighteen stations’ rainfalls in the region for different initial dates up to 2005 gathered from the bureau of meteorology. Then, the extreme rainfall threshold was calculated for each individual station using the statistical index of Gamble type I. Lastly, 22 mm was determined as the extreme rainfall value for the entire stations, and eventually 17 out of 169 extreme precipitation events were extracted in accordance with three factors including a) days with precipitation in not less than 50% of the stations, b) maximum rainfall is 22 mm or more in at least one of the stations, and c) mean precipitation of the basin is more than 3 mm. In the next step to analyze the synoptic features, the relevant meteorological data i.e. relative vorticity, geopotential height, sea level pressure, u and v wind components, relative humidity, vertical velocity, and precipitable water content at multiple levels of the atmosphere were examined from the NCEP/NCAR reanalysis dataset. The synoptic findings indicate that two patterns of deep trough and high ridge of the eastern Mediterranean were responsible for making the heavy precipitation events over the central plateau of Iran. The most and severest rainfall events occurred via deep tough pattern, which covered 76% of days with extreme precipitations during the examined period. Furthermore, the results suggest that the main moisture resources, which identified by HYSPLIT model’s outputs and moisture convergence/divergence zones for the rainy systems in the first pattern (deep trough) including Persian Gulf, Oman Sea, Indian Ocean, and Red Sea, while for the second pattern (high ridge) Persian Gulf and Red Sea play a significant role in feeding the storms in the central regions of Iran. Moreover, the southward movement of Polar Vortex is also considered as those important factors to produce extreme precipitation events over the central plateau of Iran. In general, the HYSPLIT trajectories model’s outputs confirmed the observed synoptic features in particular for the systems’ moisture feeding discussed in the patterns.
Invasive Fungal Sinusitis in Immunocompromised Patients: A Multicenter, University Hospital Experience in Shiraz  [PDF]
Mohsen Moghadami, Hossein Ruzbahani, Parisa Badiee, Abolhassan Faramarzi, Payam Peymani, Kamran Bagheri Lankarani
Advances in Infectious Diseases (AID) , 2013, DOI: 10.4236/aid.2013.34040

Objective: It is to determine the causes of invasive fungal sinusitis in patients of Shiraz University hospitals, Iran. Methods: This cross-sectional study was conducted during 18 months (from 21 March 2009 till 22 September 2010) in three Shiraz University Hospitals. Thirty-six patients with sings of invasive fungal sinusitis were enrolled, and tissue samples were investigated for histopathology, culture and antifungal susceptibility test. The laboratory results with host factor and sinus computed tomography scan were evaluated for classification of patients as proven, probable and possible invasive fungal sinusitis. Results: Thirty-five patients have involved with at least one risk factor (immune compromised disease, diabetes mellitus, or use of immune suppressed drugs). Radiological findings of parasinus invasion or necrosis were present in 20 patients. By histopathology, 21 patients were considered as proven, from these, 17 samples had positive growth. The culture aetiology agents were 4 Candida, 8 Aspergillus, and 5 Mucor. All positive culture samples were matched with histopathology findings. Significant associations were considered for radiologic finding and histopathology and culture (p < 0.05). From 8 patients with mucormycosis histopathology, 6 suffered from diabetes mellitus. None of the antifungal agents were effective on these three types of infections. Conclusion:

Prednisolone Bio-Transformation in the Culture of Filamentous Fungus Acremonium strictum
Mohammad Ali Faramarzi,Mojtaba Tabatabaei Yazdi,Mohsen Amini,Abbas Shafiee
Biotechnology , 2008,
Abstract: The whole cells of Acremonium strictum transformed prednisolone at its side chain to produce two steroid compounds. 21,21-Dimethoxy-11β-hydroxypregn-1,4-dien-3,20-dione was the main metabolite which its production has not been previously reported using microbiological means. This metabolite together with a hydroxylated derivative, 11β-hydroxyandrost-1,4-dien-3,17-dione, were purified with preparative TLC followed by their identification through 1H, 13C NMR and other spectroscopic data. Best fermentation condition was found to be 5 day incubation at 25 °C and pH value of 6 according to TLC profiles. Optimum concentration of the substrate, which gave maximum bioconversion efficiency, was 1 mg mL-1 in one batch. Biotransformation was completely inhibited in a concentration above 5 mg mL-1.
Simultaneous preconcentration of lead and cadmium ions with methyltrioctylammonium chloride supported on microcrystalline naphthalene and determination by flame atomic absorption spectrometry
Mohsen Behpour,Nasrin Soltani,Sayed Mehdi Ghoreishi
European Journal of Chemistry , 2010, DOI: 10.5155/eurjchem.1.3.216-220.86
Abstract: A sensitive and selective preconcentration method has been developed for the determination of trace amounts of lead and cadmium ions by using naphthalene-methyltrioctylammonium chloride as an adsorbent. Lead and cadmium ions were retained by the adsorbent in the minicolumn as PbI42- and CdI42-, respectively. The column was washed by 5 mL of 2 mol L-1 nitric acid solution to elute the adsorbed cations. The collected eluents then were determined by flame atomic absorption spectrometry (FAAS). Potential factors affecting on the recovery of the analytes were investigated. Meanwhile optimum conditions were established. The preconcentration factor for lead (II) and cadmium (II) have been 300 and 100, respectively. The calibration curves were linear in the range of 3 to 100 ng mL-1 for Pb2+ and in the range of 1 to 100 ng mL-1 for Cd2+, in the original water samples. The detection limits for Pb2+ and Cd2+ are 0.42 and 0.072 ng mL-1 respectively. On the other hand, the relative standard deviation (RSD) for 11 replicate measurements of 20 ng mL-1 Pb2+ and Cd2+ were 2.2% and 1.4% in the initial solution respectively (n=11). The developed method was successfully applied for the determination of trace Pb2+ and Cd2+ ions in a variety of water samples.
Selection of Bottom Liner for Land Disposal of Industrial Waste Containing Lead-Case Study: Tabriz Petrochemical Complex
Mohsen Soltani,Edwin Safari,Akbar Baghvand,Mohammad Ali Abduli
Journal of Applied Sciences , 2007,
Abstract: Industrial wastes generated at Tabriz Petrochemical Complex (TPC) were shown to contain significant concentration of lead. Environmentally sound landfilling of these waste streams was studied in terms of potential risk of associated groundwater contamination. The waste was to be disposed of in a landfill overlying an aquifer of fine sand texture and a water table depth of about 9 m. A modeling approach was employed for estimating the concentration of lead in groundwater downstream of the landfill site. The Industrial Waste Evaluation Model (IWEM) developed by US Environmental Protection Agency was used which estimates the receptor dose of lead, calculates the associated human health risk and recommends protective measures (i.e., liner type). Accordingly the appropriate liner being of composite type was selected as the required protective measure to minimize the transport of lead to the underlying aquifer which is a major source of drinking water for the downstream residential communities.
An Insight into the Interactions between -Tocopherol and Chitosan in Ultrasound-Prepared Nanoparticles
Majid Naghibzadeh,Amir Amani,Mohsen Amini,Elina Esmaeilzadeh,Negar Mottaghi-Dastjerdi,Mohammad Ali Faramarzi
Journal of Nanomaterials , 2010, DOI: 10.1155/2010/818717
Abstract: The aim of this study was to investigate the interactions between -tocopherol and chitosan molecules prepared subsequent to preparation of -tocopherol-loaded chitosan nanoparticles using ultrasonication. Dynamic light scattering (DLS) and scanning electron microscopy (SEM) analyses showed semispherical particles with an average size of approximately 350?nm. Also from reconstitution test, -tocopherol was suggested as stabilizing agent during lyophilization/reconstitution process. The zeta potentials of chitosan and -tocopherol nanoparticles were larger than 30?mV, representing suitable stability. Data obtained from FTIR showed possibility of chemical interaction between chitosan and -tocopherol. Furthermore, the results from FTIR, NMR, and XRD spectroscopy confirmed electrostatic interactions between the two molecules. Overall, this procedure could be considered as a facile method to prepare -tocopherol-loaded nanoparticles. 1. Introduction Chitosan, the second plentiful polysaccharied after cellulose in nature, is a biopolymer derived by alkaline deacetylation of chitin [1]. This polymer, exhibiting unique properties such as biocompatibility, biodegradability, low cytotoxicity, bioadhesivity, and the ability to increase the drugs absorption through polyanionic membranes, has attracted attention of many researchers in drug delivery systems [2, 3]. Among different types of chitosans, medium and high molecular weight chitosans are not fully dispersible in neutral aqueous media. This in turn limits the application of chitosans in delivery of pH-sensitive active agents such as proteins, enzymes, and genes [4]. During recent years, among different types of chitosans, low molecular weight chitosan has gained attention as a drug conjugate according to its water solubility without the need for low pH values [5, 6]. -Tocopherol, one of the lipid soluble vitamins, has proved useful in anticancer, anti-inflammatory, and antioxidant activities [7]. However, conventional formulations of tocopherol often fail to provide satisfactory bioavailability due to its hydrophobic characteristics [8]. To overcome this problem, based on Bruner and Tolloczko equation [9], it could be hypothesized that increasing the particles surface area leads to an increase in the dissolution velocity [9]. This hypothesis had been confirmed by Kotyla and coworkers that had compared nanosized tocopherol with microsized particles of this drug. The results showed an increase in bioavailability of tocopherol [10]. The principal of ultrasonication is based on formation, growth, and implosion of
Determination of Harmine and Harmaline in Peganum harmala Seeds by High-Performance Liquid Chromatography
Hamid Reza Monsef-Esfahani,Mohammad Ali Faramarzi,Venus Mortezaee,Mohsen Amini
Journal of Applied Sciences , 2008,
Abstract: A High-Performance Liquid Chromatography (HPLC) method was developed for determination of harmine, harmaline, harmol and harmalol in the extract of Peganum harmala seeds. The sample preparation was performed using liquid-liquid extraction. Chromatographic separation was achieved with a Tracer Excel 120 ODSA (150x4.6 mm) column, using a mixture of potassium phosphate buffer (10 mM, pH 7.0): acetonitrile (100:30; v/v) as mobile phase, in an isocratic mode at 1.5 mL min-1. UV detection (λ = 330 nm) was used. The calibration curves were linear (r2>0.998) in the concentration range of 0.5-20 μg mL-1 for all analytes. The lower limit of quantification for all analytes was 0.5 μg mL-1. The within and between day precisions in the measurement of QC samples at three tested concentrations were in the range of 0.6-10.2% for all analytes. The HPLC method is able to measure the harmala alkaloids in the plant extract. The method has suitable reproducibility, sensitivity and resolution for routine and accurate use with UV detection.
Multiplication and Translation Operators on the Fock Spaces for the q-Modified Bessel Function  [PDF]
Fethi Soltani
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14039
Abstract: We study the multiplication operator M by z2 and the q-Bessel operator Δq,αon a Hilbert spaces Fq,α of entire functions on the disk D( o, ) , 0<q<1 ; and we prove that these operators are adjoint-operators and continuous from Fq,α into itself. Next, we study a generalized translation operators on Fq,α .
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