Kermanshah, Iran
Kermanshah, Iran

Razi University is a public university based in Kermanshah, Iran.It is a center of research in many STEM fields such as CFD , membrane research, nano-science and nanotechnology. Razi University is ranked first in western Iran and third among Iran's public universities. The school's Science and Engineering departments attract many Iranian high school graduates as well as many graduate school applicants from all over Iran with a majority admitted from western provinces.The university has over 8,000 students, enrolled in several bachelor's , master's , and Ph.D. programs. Wikipedia.


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Cholesterol oxidase (ChOx) and catalase (CAT) were co-immobilized on a graphene/ionic liquid-modified glassy carbon electrode (GR-IL/GCE) to develop a highly sensitive amperometric cholesterol biosensor. The H2O2 generated during the enzymatic reaction of ChOx with cholesterol could be reduced electrocatalytically by immobilized CAT to obtain a sensitive amperometric response to cholesterol. The direct electron transfer between enzymes and electrode surface was investigated by cyclic voltammetry. Both enzymes showed well-defined redox peaks with quasi-reversible behaviors. An excellent sensitivity of 4.163mAmM-1cm-2, a response time less than 6s, and a linear range of 0.25-215μM (R2>0.99) have been observed for cholesterol determination using the proposed biosensor. The apparent Michaelis-Menten constant (KMapp) was calculated to be 2.32mM. The bienzymatic cholesterol biosensor showed good reproducibility (RSDs<5%) with minimal interference from the coexisting electroactive compounds such as ascorbic acid and uric acid. The CAT/ChOx/GR-IL/GCE showed excellent analytical performance for the determination of free cholesterol in human serum samples. © 2013 Elsevier B.V.


Boroun G.R.,Razi University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

The proposed linear and nonlinear behavior for the top structure function at the LHeC is considered. We present the conditions necessary to predict the top structure function F2t(x,Q2) with respect to the different predictions for the behavior of the gluon at low x. © 2014 The Author.


Boroun G.R.,Razi University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

We consider the ratio of the top structure functions Rt(τt) in top pair production as a probe of the top content of the proton at the LHeC project. We study the top structure functions with the geometrical scaling of gluon distribution at small x and show that top reduced cross section exhibits geometrical scaling in a large range of photon vitualities. This analysis shows that top longitudinal structure function has sizeable impact on the top reduced cross section at Q2≈4mt2. © 2015 The Author.


Wastewater of petrochemical industries contains high amounts of emulsified aliphatic or aromatic hydrocarbons that lead to the contamination of almost all environmental resources. The ability of Haloarcula sp. IRU1 isolated from Urmia lake, Iran for utilization of petrochemical wastewater and production of poly(3-hydroxybutyrate) (PHB) from it was evaluated and optimized by Taguchi experimental method. The optimium conditions for the maximum production of PHB were petrochemical wastewater 2% (as carbon source), tryptone 0.8% (as nitrogen source), KH2PO4 0.001% (as phosphorus source) and temperature 47°C. In conclusion, Haloarcula sp. IRU1 can degrade petrochemical wastewater and produce PHB from it in different conditions. © 2011 Elsevier B.V.


In this research, isothermal oxidation kinetics of nanocrystalline (NC) nickel prepared by electroplating as well as coarse grained (CG) nickel was investigated. Oxidation tests were carried out in static air for various durations at 700°C, 800°C and 900°C. The structure of oxidized specimens was characterized by means of SEM and XRD. Moreover, a theoretical model based on Atkinson approach as well as Maxwell Equation was proposed. The derived model was checked by fitting the theoretical curves to the experimental data using Matlab software. Good agreement between theoretical model and obtained experimental results as well as reported data was observed. The results indicated that the weight gain per unit area (w=Δm/A) of NC samples was considerably higher than the CG nickel. Moreover, the decrease in the parabolic growth rate constant (kp) of NC nickel by increasing the oxidation time was sharper than the microcrystalline samples. In spite of the overall data of log (kp), the logarithms of kp values corresponding to a given w was a linear function of the reciprocal temperature resulted an activation energy of ~108kJ/mol for oxide layer growth on NC nickel as well as CG samples. In addition, the values for the activation energy for grain boundary diffusion of Ni in NiO layer which are determined from the fitting parameters for NC and CG nickel, both were close to that for the growth of NiO layer. © 2011 Elsevier B.V.


Shahabadi N.,Razi University | Maghsudi M.,Razi University
Molecular BioSystems | Year: 2014

The interaction of methyldopa [(S)-2-amino-3-(3,4-dihydroxyphenyl)-2-methyl propanoic acid] (MDP), antihypertensive drug, with calf thymus DNA (ct-DNA) was investigated by spectroscopic and viscometric techniques. According to the results arising from the fluorescence spectra, viscosity measurements and molecular modeling studies; we concluded that MDP is a minor groove binder of ct-DNA and preferentially binds to AT rich regions. Ethidium bromide (EB) displacement studies revealed that MDP did not have any effect on EB bound DNA which is indicative of groove binding. This was substantiated by displacement studies with Hoechst 33258, a known minor groove binder. In addition, the thermodynamic and docking parameters showed that hydrophobic interaction via drug aromatic rings inside the DNA minor groove plays a major role in this binding. © 2014 The Royal Society of Chemistry.


Boroun G.R.,Razi University
Nuclear Physics B | Year: 2014

We study the structure functions Fkb(x,Q2) (k = 2, L) and the reduced cross section σrb(x,Q2) for small values of Bjorken's x variable with respect to the hard (Lipatov) pomeron for the gluon distribution and provide a compact formula for the ratio R b that is useful to extract the beauty structure function from the beauty reduced cross section, in particular at DESY HERA. Also we show that the effects of the nonlinear corrections to the gluon distribution tame the behavior of the beauty structure function and the beauty reduced cross section at low x. © 2014 The Author.


Using multidimensional Langevin equations, we have calculated the angular distribution of fission fragments with nonconstant values for the dissipation coefficient of the K coordinate (the projection of the total angular momentum I onto the symmetry axis of the fissioning nuclear system) for symmetry and asymmetry fission. We investigated the relaxation time of the K coordinate, τK, as a function of scission criteria and the asymmetry parameter. Calculations are done for 16O+232Th→248Cf, 16O+238U→254Fm, and 16O+248Cm→264Rf reactions and obtained results are compared with available experimental data. Our calculations with nonconstant values of the K coordinate show that the agreement between theoretical calculations and experimental data for asymmetry fission is better than that for symmetry fission. © 2014 American Physical Society.


Naderi D.,Razi University
Physical Review C - Nuclear Physics | Year: 2012

In this paper, the fission rate and fission probability are calculated using the Langevin dynamical approach. We employed the Langevin equations to calculate the fission probability of a hot compound nucleus and investigated the role of one- and two-body dissipation mechanisms on the fission rate and fission probability. The obtained results using one-body dissipation are lower than results based on two-body dissipation. Calculations are done for 19F +159Tb, 19F +169Tm, 19F +181Ta, and 16O +197Au reactions. It is concluded that agreement between experimental data and results of one-body dissipation, especially in lower energies, is better than calculations based on two-body viscosity. © 2012 American Physical Society.


Parvin M.H.,Razi University
Electrochemistry Communications | Year: 2011

This work describes a novel type of working electrode for use in voltammetry methods. Graphene is ideally suited for implementation in electrochemical applications due to its reported large electrical conductivity, large surface area, unique heterogeneous electron transfer rate, and low production costs. This paper presents a method for the construction of graphene paste electrode (GPE) from graphene. The GPE is not needed to be modified, because the surface of graphene is functionalized. Direct electrochemical detection of drug is of high importance in analytical chemistry. Here, the GPE was successfully used for the determination of chlorpromazine. © 2011 Elsevier B.V. All rights reserved.

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