Iranian Academic Center for Education Culture and Research

Mashhad, Iran

Iranian Academic Center for Education Culture and Research

Mashhad, Iran
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Nobari N.,Urmia University of Technology | Behboudnia M.,Urmia University of Technology | Maleki R.,Iranian Academic Center for Education Culture and Research
Applied Surface Science | Year: 2016

Thin copper films were fabricated on glass substrates by palladium-free electroless deposition, using hydrazine. The effects of modifying the deposition parameters like temperature, initial concentration and pH of electroless bath on the deposition rate and morphology of resulting films were studied and optimized. The film deposition is performed in two simple steps which shortens the pretreatment time and avoids applying expensive components and is environmentally benign. FESEM images show a uniform dispersion of Cu nanoparticles on the glass substrates in the first step. These nanoparticles act as an activator in the growth of homogeneous Cu thin film in the second step. The activation energy for the growth of Cu films was found to be 62 kJ/mol. EDX and XRD analysis demonstrates that the composition of the deposits was pure Cu with FCC crystal structure. The Cu films of 260 nm thickness showed a resistivity of about 2 × 10-6 Ω cm. © 2016 Elsevier B.V. All rights reserved.


Darjani P.,Research Institute of Food Science and Technology RIFST | Hosseini Nezhad M.,Research Institute of Food Science and Technology RIFST | Kadkhodaee R.,Research Institute of Food Science and Technology RIFST | Milani E.,Iranian Academic Center for Education Culture and Research
LWT - Food Science and Technology | Year: 2016

Inulin type fructans are among the most studied prebiotics that contribute to enhance gastrointestinal system conditions. To improve the survival and stability of probiotic Lactobacillus casei, native inulin, long-chain and short-chain inulin, were separately incorporated into alginate and chitosan coated alginate beads during the microencapsulation of bacteria. Morphology, particle size and viability of different beads were measured before and after exposure to simulated gastro-intestinal condition. Application of inulin, with different chain lengths, did not alter the shape and size of alginate/inulin beads (2.25-2.28 mm) but slightly increased the size of chitosan-coated beads (about 2.9 mm), while the diameter of micro particles containing alginate alone was 2.2 mm. When alginate beads were exposed to the simulated gastric solution, their size was significantly decreased (by about 0.2 mm), while the size of chitosan-coated beads was not affected. Using inulin and chitosan-coating, the survival of co-encapsulated cells in simulated gastro-intestinal condition was improved with only 2.7-2.9 logs reduction for L. casei and long-chain inulin showed the highest survival rate (2.7 log reduction). © 2016 Elsevier Ltd.


Heydari Majd M.,Zabol University of Medical Sciences | Heydari Majd M.,Islamic Azad University at Sabzevar | Rajaei A.,Shahrood University of Technology | Salar Bashi D.,Gonabad University of Medical Sciences | And 3 more authors.
Industrial Crops and Products | Year: 2014

The ultrasound-assisted extraction (UAE) was applied to optimize the experimental conditions for the extraction of phenolic compounds from bovine pennyroyal (Phlomidoschema parviflorum) leaves by response surface methodology (RSM) and to compare its efficiency with maceration extraction (ME). The Box-Behnken design was employed for the optimization of three extraction parameters, including extraction time (X1, min), temperature (X2, °C) and pH (X3) for the achievement of high yields of dry matter (DM), total phenolics (TP) and antioxidant activity (AA) measured by the DPPH assay [expressed as 50% effective concentration (EC50)] and the Rancimat method [expressed as induction period (IP)]. The optimum extraction conditions were as follows: extraction time 49.3min, extraction temperature 41.5°C and pH 6.5. Under these conditions, DM, TP, EC50 and IP were 25,185mg/kg sample, 15.4mgGAE/g DM, 0.48mg/ml and 5.7h, respectively. The comparison between the UAE and ME methods showed the suitability of UAE for extracting phenolic compounds from bovine pennyroyal plant. The evaluation of antioxidant activity by DPPH assay indicated that the phenolic compounds from bovine pennyroyal plant had significant antioxidant activity. The results of HPLC analysis showed that caffeic acid and quercetin were the predominant phenolic acid and flavonoid in the plant extract, respectively. © 2014 Elsevier B.V.


Ghorbani A.,Mashhad University of Medical Sciences | Naderi-Meshkin H.,Iranian Academic Center for Education Culture and Research
Current Stem Cell Research and Therapy | Year: 2016

Throughout life, different types of stem cells participate in tissue generation, maintenance, plasticity, and repair. Their abilities to secrete growth factors, to proliferate and differentiate into several cell lineages, and to migrate and home into the damaged tissues have made them attractive candidates for cell therapy and tissue engineering applications. Normal stem cell function is tied to the cell-intrinsic mechanisms and extrinsic signals derived from the surrounding microenvironment or circulation. Under-standing the regulatory signals that govern stem cell functions is essential in order to have full knowledge about organogenesis, tissue maintenance and tissue plasticity in the physiological condition. It is also important for optimizing tissue engineering and improving the therapeutic efficiency of stem cells in regenerative medicine. A growing body of evidence indicates that hormonal signals can critically influence stem cell functions in fetal, postnatal, and adult tissues. This review focuses on recent studies revealing how growth hormone, insulin, thyroid hormone, parathormone, adrenocorticotropin, glucocorticoids, erythropoietin, and gastrointestinal hormones control stem cell behavior through influencing survival, proliferation, migration, homing, and differentiation of these cells. Moreover, how environmental factors such as exercise, hypoxia, and nutrition might affect stem cell functions through influencing the endocrine system is discussed. Some of the current limitations of cell therapy and how hormones can help overcoming these limitations are briefly outlined. © 2016 Bentham Science Publishers.


Ebrahimi S.E.,Ferdowsi University of Mashhad | Koocheki A.,Ferdowsi University of Mashhad | Milani E.,Iranian Academic Center for Education Culture and Research | Mohebbi M.,Ferdowsi University of Mashhad
Food Hydrocolloids | Year: 2016

Lepidium perfoliatum seed gum (LPSG) film is brittle and permeable to water vapor. Therefore, in the present study different proportions of grass pea (Lathyrus sativus) protein isolate (LSPI) and glycerol (GLY) were used to improve the quality of the film. Fourier-transform infrared (FTIR) spectroscopy techniques were used to highlight the interactions between the two biopolymers. With addition of LSPI, the intensity and wave number of peaks changed, due to the interactions occurred between LPSG and LSPI. LPSG-LSPI blends had single glass transition temperature (Tg), meaning that LPSG and LSPI has formed a one phase blend. The moisture content, moisture absorption, water solubility and water vapor barrier of composite films significantly decreased with addition of LSPI to LPSG. Increasing LSPI to LPSG ratio led to a decrease in tensile strength (TS), young's modulus (YM) and melting point (Tm). Addition of LSPI to the composite films increased their transparency, whereas, elongation at break (EB) significantly increased when the LPSG ratio enhanced. The lightness of the composite film decreased and the film became greenish and bluish in color when the LSPI proportion increased. With incorporation of LSPI, the microstructure of films changed to a continuous and uniform network without any pores or cracks. As a result, the mechanical properties of LPSG film improved with addition of LPSI to the formulation and film made from 80:20 LPSG to LSPI ratio and 60% GLY could be used as a new biodegradable film with acceptable physical properties. © 2015 Elsevier Ltd.


Milani E.,Iranian Academic Center for Education Culture and Research | Koocheki A.,Ferdowsi University of Mashhad | Golimovahhed Q.A.,Iranian Academic Center for Education Culture and Research
International Journal of Food Science and Technology | Year: 2011

Burdock root could be a source of inulin, but scarce studies about its extraction exist. To optimise conventional and ultrasound-assisted extraction of inulin, various combinations were used. The independent variables for ultrasound extraction were sonication amplitude (20-100%), sonication temperature (20-60°C) and sonication time (5-25min) while for conventional extraction the following variables were water to solid ratio (5-15v/w), temperature (40-90°C) and time (5-40min). For each response, a second-order polynomial model was developed using multiple linear regression analysis. The use of high intensity ultrasound significantly improves the extraction of inulin contained within the body of Burdock root. It was shown that increasing the amplitude (from 20% to 85%) and extraction time increased the extraction yield; however, the effect of temperature was minor. Optimum extraction condition was found to be sonication time: 25min, sonication amplitude 83.22% and temperature: 36.76°C. © 2011 The Authors. International Journal of Food Science and Technology © 2011 Institute of Food Science and Technology.


Ansari R.,Guilan University | Keivani M.B.,Iranian Academic Center for Education Culture and Research | Delavar A.F.,Guilan University
Journal of Polymer Research | Year: 2011

In this research, polyaniline was synthesized chemically onto the surface of sawdust as a thin layer (termed as PAni/SD) and was then used for removal of tartrazine dye (a typical anionic azo dye) from aqueous solutions. Ammonium peroxodisulphate was used as chemical oxidant for polymerization of polyaniline directly on the surface of sawdust. The procedure involves sorption experiments were performed on both batch and column systems. The effects of some important parameters such as pH, initial concentration, sorbent dosage, exposure time and temperature on uptake of tartrazine dye were investigated. Adsorption studies have shown that pH of the tartrazine solution has influence on the dye removal capacity of PAni/SD. It was found that effective dye removal is occurred under neutral or acidic conditions. The treatments of the data were carried out using both Freundlich and Langmuir adsorption isotherms. Sorption/desorption studies showed that PAni/SD was fast, simple, inexpensive, highly efficient and potential re-usable adsorbent to remove tartrazine from aqueous solutions. Based on our kinetics and thermodynamic studies, it was found that sorption process was endothermic (ΔH∈>∈0) and the experimental data fitted very well with pseudo second-order kinetic model. © 2011 Springer Science+Business Media B.V.


Zandsalimi S.,Iranian Academic Center for Education Culture and Research | Karimi N.,Razi University | Kohandel A.,Iranian Academic Center for Education Culture and Research
International Journal of Environmental Science and Technology | Year: 2011

Arsenic concentrations of surface waters, soils and plants were surveyed in three contaminated villages of Bijar County. Total arsenic in water samples (4.5 to 280 μg/L) was correlated with electrical conductivity, total dissolved solid, total hardness, alkalinity, chloride, sulphate, bicarbonate, calcium and sodium (p<0.001). Total arsenic in the soils ranged from 105.4 to 1500 mg/kg. Some of the soil factors play an important role in soil arsenic content and its bioavailability for organisms. In general, the arsenic concentrations in plants were low, especially in the most common wild species. Among 13 plant species, the highest mean arsenic concentration was found in leaves of Mentha Longifolia (79.4 mg/kg). Arsenic levels in soils and plants were positively correlated, while the ability of the plants to accumulate the element, expressed by their biological accumulation coefficients and arsenic transfer factors, was independent of the soil arsenic concentration. Relationships between the arsenic concentrations in plants, soils and surface water and the environmental aspects of these relationships have been discussed in comparison with literature data. The accumulation of arsenic in environmental samples (soil, sediment, water, plant, etc.) poses a potential risk to human health due to the transfer of this element in aquatic media, their uptake by plants and subsequent introduction into the food chain. © IRSEN, CEERS, IAU.


Ansari R.,Guilan University | Keivani M.B.,Iranian Academic Center for Education Culture and Research | Delavar A.F.,Guilan University
Journal of Applied Polymer Science | Year: 2011

In this research, the removal of carmoisine dye from aqueous solutions using polypyrrole coated onto sawdust (PPy/SD) has been investigated. The sorption experiments were performed using both batch and column systems. The effects of some important parameters such as pH, initial concentration, sorbent dosage, exposure time, and temperature on uptake of carmoisine dye were investigated. Based on the data obtained in batch system, it was found that maximum adsorption is occurred under acidic conditions. Complete removal was observed when a dye solution with the initial concentration of 100 mg L -1 was treated by 1.0 g of the used adsorbent (PPy/SD) at pH value of 4 and room temperature. However, higher sorption was observed at elevated temperature. According to the kinetics study, it was found that the experimental data fitted very well the pseudo-second-order kinetic model (k2 = 0.184 g mg-1 min-1). It was found that polypyrrole chemically coated on SD is an efficient system for the removal of carmoisine dye from aqueous solutions. Desorption of the dye-loaded column was also possible by using dilute NaOH solution with high efficiency (∼ 80%). © 2011 Wiley Periodicals, Inc.


Milani E.,Iranian Academic Center for Education Culture and Research | Koocheki A.,Ferdowsi University of Mashhad
International Journal of Dairy Technology | Year: 2011

The effect of adding date syrup (0%, 25% and 50% as sugar replacement) and guar gum (0%, 0.1%, 0.2% and 0.3% as fat replacement) was examined in respect of physicochemical, rheological and sensory properties of low fat frozen yoghurt. Increasing date syrup and guar gum concentration increased the mixture viscosity and acidity. Guar gum softened the frozen yoghurt whereas date syrup increased the hardness of the product. The control yoghurt was less sticky than samples containing the gum, but date syrup had no significant effect on the samples stickiness. Melt-down stability of the samples also increased with increase in gum and date syrup concentration. The low fat orange flavoured frozen yoghurt dessert prepared in this study also had good sensory properties. © 2010 Society of Dairy Technology.

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