Entity

Time filter

Source Type


Torkashvand M.,Razi UniversityKermanshah | Gholivand M.B.,Razi UniversityKermanshah | Malekzadeh G.,Islamic Azad UniversityKhuzestan
Sensors and Actuators, B: Chemical | Year: 2016

In this paper a new electrochemical sensor based on molecularly imprinted polymer immobilized on multiwall carbon nanotube surface was introduced for determination of ceftazidime. The sensor was constructed via synthesis of a molecularly imprinted polymer on glassy carbon electrode which has been modified with carboxyl-functionalized multiwall carbon nanotubes. Then, for increasing the sensitivity of the sensor, Ag dendrites (AgDs) nanobranch was deposited on polymer electrochemically. The resulting imprinted polymer-multiwall carbon nanotube composite showed high sensitivity, excellent stability and good specific recognition behavior towards template molecule. The morphology of AgDs/MIP/c-MWCNT/GCE was investigated by field emission scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy in detail. Under the optimal experimental conditions, the current response of the imprinted sensor was linear to the concentration of ceftazidime in the range of 2-500 and 500-7000 nM, with the limit of detection of 0.55 nM (S/N = 3). The proposed sensor has also been examined for recognition of ceftazidime quantitatively, in complicated matrices real samples. © 2016 Elsevier B.V. All rights reserved. Source


Eight different grasses collected from pastures of the Kermanshah province (Kermanshah, Iran), at mid-vegetative stage were used to study the relationships between their chemical compositions, kinetic parameters of in vitro gas production and rumen methane production. There was a positive correlation (r = 0.62, p < 0.05) between crude protein (CP) content of grasses and total gas production (A) at 96h incubation. Negative correlations were also observed between acid detergent fiber (ADF) content and total gas production (r = -0.60, p < 0.05). Amongst the nutrients, neutral detergent fiber (NDF) and ADF were positively correlated with methane concentration, (r = 0.75 and 0.77, p < 0.01). The methane reduction potential (MRP) was negative for Trachyspermum copticum indicating higher methane production than the control hay for this grass. The MRP of Chamaemelum nobile was more than 25%, indicating plants that reduce methane production more than 20 percent methane in comparison with control actually have ingredients to reduce methane. © 2015, Eduem - Editora da Universidade Estadual de Maringa. All rights reserved. Source


Karami J.,Razi UniversityKermanshah | Zalipoor S.,Razi UniversityKermanshah | Pourjavad M.,Mashhad University of Medical Sciences
Iranian Journal of Obstetrics, Gynecology and Infertility | Year: 2014

Introduction: Premenstrual syndrome includes physical, cognitive, and behavioral changes and is one of the most common disorders of reproductive age which causes disruption in women’s function. So, applying inexpensive and effective methods is necessary to relieve or improve the symptoms. This study was performed with the aim to assess the efficacy of emotional disclosure on premenstrual syndrome. Methods: This is a quasi-experimental, pretest-posttest study with case and control group which was performed on 30 girl student with premenstrual syndrome living in the dormitories of Kermanshah Razi University. The subject were randomly assigned into two experimental and control groups. The experimental group performed 4 to 5 half hour sessions of written emotional disclosure during two weeks and the control group with same amount performed writing about the issues with less emotional dimension. Then, posttest was performed in both groups. Data were analyzed by covariance test. PResults: According to the results of covariance test, written emotional disclosure significantly decreased total score of premenstrual syndrome in the experimental group than the control group in posttest (P<0.003). Conclusion: Emotional disclosure is effective in decreasing the symptoms of premenstrual syndrome. © 2015, Mashhad University of Medical Sciences. All rights reserved. Source


Gholivand M.-B.,Razi UniversityKermanshah | Akbari A.,Razi UniversityKermanshah
Materials Science and Engineering C | Year: 2016

Multi-walled carbon nanotube (MWCNTS) coated with poly p-aminobenzene sulfonic acid/β-cyclodextrin (p-ABSA/β-CD) film was used as an effective strategy for modification of the surface of glassy carbon electrode (GCE). Electrochemical study and determination of citalopram (CT) were investigated at the p (p-ABSA)/β-CD/MWCNT/GC using cyclic and differential pulse anodic stripping voltammetric techniques. The results indicate that the p (p-ABSA)/β-CD/MWCNT/GC significantly enhanced the oxidation peak current of CT. The modified electrode was characterized by electrochemical impedance spectroscopy (EIS), scanning electron microscopy(SEM) and cyclic voltammetry (CV).The fabricated electrochemical sensor exhibits a fast and reversible linear response toward CT within the concentration ranges of 90 nM-1 μM, 1-11 μM and 11-100 μM with correlation coefficients greater than 0.99 and detection limit of 44 nM. The resulting functionalized polymer film features interesting electrochemical properties such good recovery, reproducibility and selectivity toward CT. The applicability of the proposed sensor was tested by determination of CT in pharmaceutical combinations and human body fluids. © 2016 Elsevier B.V. All rights reserved. Source


Dehdashtian S.,Iran University of Science and Technology | Gholivand M.B.,Razi UniversityKermanshah | Shamsipur M.,Razi UniversityKermanshah | Karimi Z.,Payame Noor University
Sensors and Actuators, B: Chemical | Year: 2015

Abstract A novel, simple, selective and robust sensor has been developed for the electrochemical determination of metformin (MET) using anodic stripping voltammetry. The sensor was designed by incorporating of a nano sized mesoporous silica material functionalized by copper ion (SBA-15-Cu(II)) in the carbon paste electrode (CPE). The sensitivity of the sensor was improved by increasing the accumulation of MET on the surface of the electrode through complex with copper ions. The synthesized SBA-15-Cu(II) was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Under optimized conditions, the modified electrode exhibited a linear response over the MET concentration range of 0.1-65 μM, with a detection limit of 30 nM. Also, the applicability of the method to the direct assays of the pharmaceutical and biological fluid real samples was investigated. © 2015 Elsevier B.V. Source

Discover hidden collaborations