Mohammad sabet - Academia.edu (original) (raw)
Papers by Mohammad sabet
BACKGROUND In recent years, there is an increasing tendency to use diced cartilage grafts in rhin... more BACKGROUND In recent years, there is an increasing tendency to use diced cartilage grafts in rhinoplasty surgery for improving dorsum contour irregularities. This study was designed to compare graft resorption between three techniques of diced cartilage using surgical blade, electrical grinder and grater in rabbit model. METHODS Thirteen New Zealand rabbits were divided into three groups. Three 2×2 cm cartilage specimens were harvested from one of their ears. In group one, the cartilage was diced by use of No:11 surgical blade to o.5 to 1 mm cube pieces. In group two, an electrical grinder was used and in group three, a grater was applied. The grafts were placed in three subcutaneous pockets in the back of rabbits and after 12 weeks, the implants were removed and their weight and volume were recorded and were evaluated by histological techniques. RESULTS There was no difference between the three methods in the 3 groups for graft resorption. There was no change in the volume, but the...
PurposePurple acid phosphatases (PAPs) have included the largest classes of non-specific plant ac... more PurposePurple acid phosphatases (PAPs) have included the largest classes of non-specific plant acid phosphatases. Most characterized PAPs were found to play physiological functions in phosphorus metabolism. In this study, we investigated the function of AtPAP17 gene encoding an important purple acid phosphatase in A. thaliana.MethodsThe full-length cDNA sequence of AtPAP17 gene under the control of CaMV-35S promoter was transferred to the A. thaliana WT plant. The generated homozygote AtPAP17-overexpressed plants were compared by types of analyses with corresponding homozygote atpap17-mutant plant and WT in both of + P (1.2 mM) and –P (0 mM) conditions.ResultsThe highest and the lowest amount of Pi observed in AtPAP17-overexpressed plants with 111% more and atpap17-mutant plant by 38% less than WT in + P condition, respectively. Furthermore at the same condition, APase activity of AtPAP17-overexpressed plants increased 24% compared to the WT. Inversely, atpap17-mutant plant represen...
BMC Plant Biology
Background Viruses are the major threat to commercial potato (Solanum tuberosum) production world... more Background Viruses are the major threat to commercial potato (Solanum tuberosum) production worldwide. Because viral genomes only encode a small number of proteins, all stages of viral infection rely on interactions between viral proteins and host factors. Previously, we presented a list of the most important candidate genes involved in potato plants’ defense response to viruses that are significantly activated in resistant cultivars. Isolated from this list, Aspartic Protease Inhibitor 5 (API5) is a critical host regulatory component of plant defense responses against pathogens. The purpose of this study is to determine the role of StAPI5 in defense of potato against potato virus Y and potato virus A, as well as its ability to confer virus resistance in a transgenic susceptible cultivar of potato (Desiree). Potato plants were transformed with Agrobacterium tumefaciens via a construct encoding the potato StAPI5 gene under the control of the Cauliflower mosaic virus (CaMV) 35S promot...
Journal of Electronic Materials, 2020
Carbon quantum dot-graphene oxide hybrids have been synthesized from rice precursor using a ball-... more Carbon quantum dot-graphene oxide hybrids have been synthesized from rice precursor using a ball-milling-assisted hydrothermal method. The structure of the quantum dots and graphene oxide was studied using x-ray diffraction analysis, energy-dispersive x-ray spectroscopy, and elemental mapping. The size and morphology of the nanostructures were studied using field-emission scanning electron microscopy and transmission electron microscopy, revealing that the product was composed of spherical nanoparticles and nanosheets. We argue that the presence of some metals in the rice precursor can catalyze the synthesis of graphene oxide. The structure of the product was studied by Fourier-transform infrared spectroscopy. Investigation of the optical properties of the quantum dots and graphene oxide by ultraviolet-visible spectroscopy and photoluminescence (PL) spectroscopy revealed strong PL properties. The PL quantum yield could be improved by surface modification using polyethylene glycol, polyvinylpyrrolidone, ethylenediaminetetraacetic acid, and acetylacetone. The photocatalytic properties of the carbon nanomaterial (CNM) were investigated based on the decomposition of Eriochrome Black-T and Eosin Y dyes, revealing strong photocatalytic activity. The thermal stability of the product was examined by thermogravimetric analysis. Furthermore, atomic absorption spectroscopy showed that CNM could be used to eliminate cations of heavy metals such as lead and cadmium from toxic water.
Luminescence, 2020
In this study, highly photoluminescent and photocatalytic Fe2O3@carbon quantum dots/graphene oxid... more In this study, highly photoluminescent and photocatalytic Fe2O3@carbon quantum dots/graphene oxide nanostructures were synthesized using ball milling‐assisted hydrothermal synthesis with hard pistachio shells. Different analyses, such as X‐ray diffraction, energy dispersive X‐ray spectroscopy, and Fourier transform infrared spectroscopy were used to study the product structure. Scanning electron microscopy and transmission electron microscopy images were used to study product size and morphology. Optical properties of the as‐synthesized nanomaterials were investigated using ultraviolet–visible light and photoluminescence analyses. To increase photoluminescence intensity, ethylene diamine tetraacetic acid, polyethylene glycol, polyvinylpyrrolidone, and acetylacetonate anions were used to modify the product surface. Thermal stability of the product was studied using thermal gravimetric analysis. Finally, photocatalytic activity and surface adsorption of the product were investigated; ...
Nanoscience &Nanotechnology-Asia, 2019
Background: Due to unique chemical and physical properties and potential application in many fiel... more Background: Due to unique chemical and physical properties and potential application in many fields, nanostructured materials have attracted many attentions. Cadmium sulfide (CdS) is a semiconductor that has a wide band gap of 2.42 eV at room temperature and can be served in solar cells and photoluminescence devices. Cadmium sulfide (CdS) is a kind of attractive semiconductor material, and it is now widely used for optoelectronic applications. CdS nano and microstructures can be synthesized via different chemical methods such as microwave-solvothermal synthesis, surfactant-ligand coassisting solvothermal method and hydrothermal route. Also different morphologies of this semiconductor such as dendrites, nanorods, sphere-like, flakes, nanowires, flower-like shape triangular and hexagonal plates, were synthesized. Methods: To synthesis of the nanocomposite, a simple co-precipitation method was served. In briefly, 0.1 g of Pb(NO3)2 was dissolved in the distilled water (Solution 1). Also...
Journal of Materials Science: Materials in Electronics, 2018
In this experimental work, different conductive polymer nanocomposites were synthesized using pol... more In this experimental work, different conductive polymer nanocomposites were synthesized using polypyrrole as conductive polymer and CoFe 2 O 4 , NiFe 2 O 4 , CNT and graphene as fillers. X-ray diffraction pattern was used to study the crystallinity of the products and it was found CoFe 2 O 4 , NiFe 2 O 4 , CNT, and graphene were successfully embedded in the polymer matrix. To further approve the synthesis of the nanocomposites, energy dispersive X-ray spectroscopy was served. Surface groups of the synthesized nanocomposites were studied by Fourier transform infrared and Raman spectroscopy. The morphology of the products was examined by scanning electron microscopy and transmission electron microscopy. It was found the fillers were successfully embedded in the polymer matrix and they were in nanometer scales. To investigate the magnetic properties and conductivity of the polymer nanocomposites, alternating gradient force magnetometer and four-point probe were used, respectively. Finally, the microwave absorption properties of the polymer nanocomposites were studied and it was found the fillers have different effects on the polymer microwave absorption value.
DARU Journal of Pharmaceutical Sciences, 2018
Background Paclitaxel is a potent antitumor alkaloid widely used for the treatment of several can... more Background Paclitaxel is a potent antitumor alkaloid widely used for the treatment of several cancer types. This valuable secondary metabolite naturally exists in the inner bark of Taxus species in very low amounts. The small-scale production of paclitaxel in Taxus cell cultures requires utilization of several elicitors. Objective The main objective of this work was to identify key genes that encode rate-limiting enzymes in paclitaxel biosynthesis pathway by investigating the possible relationship between paclitaxel production and a set of 13 involved genes' relative expression in Taxus baccata L. cell suspension cultures affected by coronatine and methyl-β-cyclodextrin. Methods In the present research, the most important key genes were identified using gene expression profiling evaluation and paclitaxel production assessment in Taxus baccata L. cell cultures affected by mentioned elicitors. Results and Conclusion Gene expression levels were variably increased using methyl-β-cyclodextrin, and in some cases, a synergistic effect on transcript accumulation was observed when culture medium was supplemented with both elicitors. It was revealed that DBAT, BAPT, and DBTNBT are the most important rate-limiting enzymes in paclitaxel biosynthesis pathway in Taxus baccata L. cell suspension cultures under coronatine and methyl-βcyclodextrin elicitation condition. Moreover, PAM was identified as one of the important key genes especially in the absence of β-phenylalanine. In cell cultures affected by these elicitors, paclitaxel was found largely in the culture media (more than 90%). The secretion of this secondary metabolite suggests a limited feedback inhibition and reduced paclitaxel toxicity for producer cells. It is the result of the ABC gene relative expression level increment under methyl-β-cyclodextrin elicitation and highly depends on methyl-β-cyclodextrin's special property (complex formation with hydrophobic compounds). Paclitaxel biosynthesis was obviously increased due to the effect of coronatine and methyl-β-cyclodextrin elicitation, leading to the production level of 5.62 times higher than that of the untreated cultures.
Food Chemistry, 2021
The gold electrode was functionalized with anti-bisphenol A (BPA) aptamer and captured the BPA as... more The gold electrode was functionalized with anti-bisphenol A (BPA) aptamer and captured the BPA as analyte. By dropping the aptamer-modified magnetic Fe3O4/Au nanoparticles solution onto the electrode, a BPA molecule attaches to many aptamers that are in contact with a large number of Fe3O4/Au nanoparticles. The modified electrode were transferred to a solution containing Ag+ ions. Fe3O4/Au nanoparticles reduce the Ag+ ions to Ag0. A potential scan was applied for the oxidation of the Ag0-loaded magnetic nanoparticles to the AgCl. The magnitude of the stripping anodic signal of the Ag0 was related to the concentration of the BPA. The assay shows a detection limit of 0.6 fmol L-1 and linear range of 1 fmol L-1-150 pmol L-1 and. The applicability of the aptasensor is measured by its successful use in the sensing BPA in water, milk and juice samples and measuring BPA migration from different commercial plastic products.
Journal of Cluster Science, 2017
In this article, we deposited a layer of ZnO nanostructure doped with various concentrations from... more In this article, we deposited a layer of ZnO nanostructure doped with various concentrations from 0.0 to 4.0% volume percentage of aluminum and gallium on the glass substrate via sol-gel process and spin coating technique. The sol concentration that used for spin coating was 0.1 M. The thin films were analyzed by X-ray diffraction, scanning electron microscopy, UV-Vis spectrometer and resistivity measurement (four point probe) to investigate the structural, surface morphology, optical transmittance, and electrical properties of the thin films. Then the optimized layers were used in dye-sensitized solar cells. The sample with GZO/ AZO bilayer shows the 10.2 mA/cm 2 short circuit current density, 0.51 V open circuit voltage, 56% fill factor and 2.91% efficiency.
![Research paper thumbnail of Using the [Co(oct)2] as a New Precursor for Simple Synthesis of CoS2 Nanoparticles and Kinetics Studies on Photocatalytic Activities Under UV Irradiation](https://attachments.academia-assets.com/111134397/thumbnails/1.jpg)
](Journal of Nanostructures, 2018
Cobalt sulfide (CoS2) nanostructures were synthesized via a simple thermal decomposition method u... more Cobalt sulfide (CoS2) nanostructures were synthesized via a simple thermal decomposition method using [Co(oct)2] as a new precursor. Using the organometallic compound as precursor could synthesize materials in nano-scale because of having the massive structure that acted as capping agent. The products were characterized by various analyses such as X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fourier transform infrared (FT-IR) spectroscopy. Also, the optical properties of this product was investigated by photoluminescence spectroscopy (PL). However, band gap of CoS2 nanostructures was estimated about 2.2 eV in this work but CoS2 was considered as a metallic product in the former work. This difference may be related to quantum effects in nanomaterials. The photocatalytic activity of CoS2 nanoparticles was examined by decolorization of Erythrosine as an organic pollutant under UV irradiation and degradation percent of t...
Journal of Materials Science: Materials in Electronics, 2017
Journal of Molecular Liquids, 2017
In this work, we studied a new sensor to determine the ascorbic acid (AA) based on CeO 2 nanostru... more In this work, we studied a new sensor to determine the ascorbic acid (AA) based on CeO 2 nanostructures and multi-walled carbon nanotube on the pencil graphite electrode. For this purpose, different morphologies of CeO 2 nanostructures were synthesized via a simple hydrothermal method and their applications in the biosensors were investigated. Different parameters such as capping agent kind, hydrothermal time, and temperature on the product size and morphology were studied. The products were characterized via different analysis such as X-ray diffraction pattern (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Photoluminescence (PL), Fourier transform infrared (FT-IR), N2 adsorption (BET) and Cyclic Voltammetry (CV). The results showed that each parameter has a significant effect on the product size and morphology. This method showed appropriate responses to a trace amount of AA and the limit of detection was found to be 8 nmol L −1 for AA.
Journal of Materials Science: Materials in Electronics, 2016
In this experimental work different morphologies of the new Cu 2 CdI 4 /CuI nanocomposite were sy... more In this experimental work different morphologies of the new Cu 2 CdI 4 /CuI nanocomposite were synthesized via simple hydrothermal method. Different parameters such as CuI/CdI mole ratio, hydrothermal time and temperature were investigated on the product size and morphology. It was found that the product morphologies are dependent on these parameters, significantly. The crystallity and purity of the products were studied with X-ray diffraction pattern. It was found that the products are mainly composed nanocomposite and there were not any peaks related to other materials. The morphology of the products was investigated by SEM images and it was calculated that different parameters had a significant role in product size and morphology. The optical property of the product was obtained from diffuse reflectance spectroscopy. Finally, the photocatalytic activity of the nanostructure was investigated.
Journal of Cluster Science, 2015
In this study, lead molybdate (PbMoO4) nanostructures were synthesized successfully via a simple ... more In this study, lead molybdate (PbMoO4) nanostructures were synthesized successfully via a simple and fast co-precipitation method. A new lead precursor [pb(2-hydroxyacetophenone)]2 was used for synthesis of the product. It was seen that using lead complex led to create of very tiny structures that can be attributed its steric effect. Different parameters such as pH, surfactant kind and solvent were changed to study their effect on the product size and morphology. It was found each parameter can effect on the product shape and change particle size and morphology. Different analysis such as scanning electron microscopy, X-ray diffraction pattern, Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy were used to characterize the fabricated products. Also photocatalytic activity of the product was studied by UV–Visble spectroscopy and it was found that synthesized lead molybdate can act as photocatalyst under visible light range.
Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2014
ABSTRACT This study focuses on the preparation and characterization of single phase CuInS2 nanopa... more ABSTRACT This study focuses on the preparation and characterization of single phase CuInS2 nanoparticles with [diaquabis(salisylate)copper(II)], [Cu(Hsal)2(H2O)2] as precursor via microwave technique. Several effects on product morphology have been investigated, such as sulfur sources, solvent, power, and time of microwave. The products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-visible spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. Thin films CuInS2 were prepared by doctor's blade method and then studied via I-V characterization.
Materials Science in Semiconductor Processing, 2013
CuInS 2 microspheres were synthesized by Ultrasonic method in propylene glycol as solvent and cop... more CuInS 2 microspheres were synthesized by Ultrasonic method in propylene glycol as solvent and copper oxalate, indium chloride and thioacetamde (TAA) as precursors. Optimum conditions such as reaction time, solvent type, sulfur source, and ultrasonic power were determined. Then, a thin film of CuInS 2 was prepared and its application in solar cells was investigated. Photovoltaic characteristics such as V oc , J sc and FF were measured. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy were performed to characterize the CuInS 2 microsphere. The optical band gap of the CuInS 2 microsphere was estimated to be 2.28 eV.
Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2014
CoS2 nanostructures were synthesized successfully via hydrothermal approach with new precursor. T... more CoS2 nanostructures were synthesized successfully via hydrothermal approach with new precursor. The products were characterized with X-ray diffraction and scanning electron microscopy. The effect of different sulfur sources were investigated on product size and morphology.
Bulletin of Materials Science, 2014
CuInS 2 nanostructures were synthesized by sonochemical route using (bis(salicylate)copper(II)) a... more CuInS 2 nanostructures were synthesized by sonochemical route using (bis(salicylate)copper(II)) as a new copper precursor. The effects of different parameters such as sulphur source, solvent, power of irradiation and reaction time on the morphology of the products were investigated. Nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and Fourier transform infrared (FT-IR) spectroscopy. CuInS 2 nanostructures paste was prepared by doctor's blade technique on the transparent conductive oxide (TCO). The fill factor (FF), open circuit voltage (V oc), and short circuit current (I sc) were obtained by I-V characterization.
Materials Science in Semiconductor Processing, 2013
Copper indium sulfide, CuInS 2 , nanocrystals were synthesized by a new precursor complex, [bis(2... more Copper indium sulfide, CuInS 2 , nanocrystals were synthesized by a new precursor complex, [bis(2-hyroxyacetophenato)copper(II)], [Cu(HAP) 2 ], via a microwave method. The effects of sulfur sources, solvents, heating time and microwave power on morphology of product were investigated. The as-synthesized CuInS 2 nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) spectroscopy, and room temperature photoluminescence (PL) spectroscopy. The nanoparticles of CuInS 2 were used to prepare CuInS 2 film by doctor's blade technique. The fill factor (FF), open circuit voltage (V oc), and short circuit current (I sc) were obtained by I-V characterization.
BACKGROUND In recent years, there is an increasing tendency to use diced cartilage grafts in rhin... more BACKGROUND In recent years, there is an increasing tendency to use diced cartilage grafts in rhinoplasty surgery for improving dorsum contour irregularities. This study was designed to compare graft resorption between three techniques of diced cartilage using surgical blade, electrical grinder and grater in rabbit model. METHODS Thirteen New Zealand rabbits were divided into three groups. Three 2×2 cm cartilage specimens were harvested from one of their ears. In group one, the cartilage was diced by use of No:11 surgical blade to o.5 to 1 mm cube pieces. In group two, an electrical grinder was used and in group three, a grater was applied. The grafts were placed in three subcutaneous pockets in the back of rabbits and after 12 weeks, the implants were removed and their weight and volume were recorded and were evaluated by histological techniques. RESULTS There was no difference between the three methods in the 3 groups for graft resorption. There was no change in the volume, but the...
PurposePurple acid phosphatases (PAPs) have included the largest classes of non-specific plant ac... more PurposePurple acid phosphatases (PAPs) have included the largest classes of non-specific plant acid phosphatases. Most characterized PAPs were found to play physiological functions in phosphorus metabolism. In this study, we investigated the function of AtPAP17 gene encoding an important purple acid phosphatase in A. thaliana.MethodsThe full-length cDNA sequence of AtPAP17 gene under the control of CaMV-35S promoter was transferred to the A. thaliana WT plant. The generated homozygote AtPAP17-overexpressed plants were compared by types of analyses with corresponding homozygote atpap17-mutant plant and WT in both of + P (1.2 mM) and –P (0 mM) conditions.ResultsThe highest and the lowest amount of Pi observed in AtPAP17-overexpressed plants with 111% more and atpap17-mutant plant by 38% less than WT in + P condition, respectively. Furthermore at the same condition, APase activity of AtPAP17-overexpressed plants increased 24% compared to the WT. Inversely, atpap17-mutant plant represen...
BMC Plant Biology
Background Viruses are the major threat to commercial potato (Solanum tuberosum) production world... more Background Viruses are the major threat to commercial potato (Solanum tuberosum) production worldwide. Because viral genomes only encode a small number of proteins, all stages of viral infection rely on interactions between viral proteins and host factors. Previously, we presented a list of the most important candidate genes involved in potato plants’ defense response to viruses that are significantly activated in resistant cultivars. Isolated from this list, Aspartic Protease Inhibitor 5 (API5) is a critical host regulatory component of plant defense responses against pathogens. The purpose of this study is to determine the role of StAPI5 in defense of potato against potato virus Y and potato virus A, as well as its ability to confer virus resistance in a transgenic susceptible cultivar of potato (Desiree). Potato plants were transformed with Agrobacterium tumefaciens via a construct encoding the potato StAPI5 gene under the control of the Cauliflower mosaic virus (CaMV) 35S promot...
Journal of Electronic Materials, 2020
Carbon quantum dot-graphene oxide hybrids have been synthesized from rice precursor using a ball-... more Carbon quantum dot-graphene oxide hybrids have been synthesized from rice precursor using a ball-milling-assisted hydrothermal method. The structure of the quantum dots and graphene oxide was studied using x-ray diffraction analysis, energy-dispersive x-ray spectroscopy, and elemental mapping. The size and morphology of the nanostructures were studied using field-emission scanning electron microscopy and transmission electron microscopy, revealing that the product was composed of spherical nanoparticles and nanosheets. We argue that the presence of some metals in the rice precursor can catalyze the synthesis of graphene oxide. The structure of the product was studied by Fourier-transform infrared spectroscopy. Investigation of the optical properties of the quantum dots and graphene oxide by ultraviolet-visible spectroscopy and photoluminescence (PL) spectroscopy revealed strong PL properties. The PL quantum yield could be improved by surface modification using polyethylene glycol, polyvinylpyrrolidone, ethylenediaminetetraacetic acid, and acetylacetone. The photocatalytic properties of the carbon nanomaterial (CNM) were investigated based on the decomposition of Eriochrome Black-T and Eosin Y dyes, revealing strong photocatalytic activity. The thermal stability of the product was examined by thermogravimetric analysis. Furthermore, atomic absorption spectroscopy showed that CNM could be used to eliminate cations of heavy metals such as lead and cadmium from toxic water.
Luminescence, 2020
In this study, highly photoluminescent and photocatalytic Fe2O3@carbon quantum dots/graphene oxid... more In this study, highly photoluminescent and photocatalytic Fe2O3@carbon quantum dots/graphene oxide nanostructures were synthesized using ball milling‐assisted hydrothermal synthesis with hard pistachio shells. Different analyses, such as X‐ray diffraction, energy dispersive X‐ray spectroscopy, and Fourier transform infrared spectroscopy were used to study the product structure. Scanning electron microscopy and transmission electron microscopy images were used to study product size and morphology. Optical properties of the as‐synthesized nanomaterials were investigated using ultraviolet–visible light and photoluminescence analyses. To increase photoluminescence intensity, ethylene diamine tetraacetic acid, polyethylene glycol, polyvinylpyrrolidone, and acetylacetonate anions were used to modify the product surface. Thermal stability of the product was studied using thermal gravimetric analysis. Finally, photocatalytic activity and surface adsorption of the product were investigated; ...
Nanoscience &Nanotechnology-Asia, 2019
Background: Due to unique chemical and physical properties and potential application in many fiel... more Background: Due to unique chemical and physical properties and potential application in many fields, nanostructured materials have attracted many attentions. Cadmium sulfide (CdS) is a semiconductor that has a wide band gap of 2.42 eV at room temperature and can be served in solar cells and photoluminescence devices. Cadmium sulfide (CdS) is a kind of attractive semiconductor material, and it is now widely used for optoelectronic applications. CdS nano and microstructures can be synthesized via different chemical methods such as microwave-solvothermal synthesis, surfactant-ligand coassisting solvothermal method and hydrothermal route. Also different morphologies of this semiconductor such as dendrites, nanorods, sphere-like, flakes, nanowires, flower-like shape triangular and hexagonal plates, were synthesized. Methods: To synthesis of the nanocomposite, a simple co-precipitation method was served. In briefly, 0.1 g of Pb(NO3)2 was dissolved in the distilled water (Solution 1). Also...
Journal of Materials Science: Materials in Electronics, 2018
In this experimental work, different conductive polymer nanocomposites were synthesized using pol... more In this experimental work, different conductive polymer nanocomposites were synthesized using polypyrrole as conductive polymer and CoFe 2 O 4 , NiFe 2 O 4 , CNT and graphene as fillers. X-ray diffraction pattern was used to study the crystallinity of the products and it was found CoFe 2 O 4 , NiFe 2 O 4 , CNT, and graphene were successfully embedded in the polymer matrix. To further approve the synthesis of the nanocomposites, energy dispersive X-ray spectroscopy was served. Surface groups of the synthesized nanocomposites were studied by Fourier transform infrared and Raman spectroscopy. The morphology of the products was examined by scanning electron microscopy and transmission electron microscopy. It was found the fillers were successfully embedded in the polymer matrix and they were in nanometer scales. To investigate the magnetic properties and conductivity of the polymer nanocomposites, alternating gradient force magnetometer and four-point probe were used, respectively. Finally, the microwave absorption properties of the polymer nanocomposites were studied and it was found the fillers have different effects on the polymer microwave absorption value.
DARU Journal of Pharmaceutical Sciences, 2018
Background Paclitaxel is a potent antitumor alkaloid widely used for the treatment of several can... more Background Paclitaxel is a potent antitumor alkaloid widely used for the treatment of several cancer types. This valuable secondary metabolite naturally exists in the inner bark of Taxus species in very low amounts. The small-scale production of paclitaxel in Taxus cell cultures requires utilization of several elicitors. Objective The main objective of this work was to identify key genes that encode rate-limiting enzymes in paclitaxel biosynthesis pathway by investigating the possible relationship between paclitaxel production and a set of 13 involved genes' relative expression in Taxus baccata L. cell suspension cultures affected by coronatine and methyl-β-cyclodextrin. Methods In the present research, the most important key genes were identified using gene expression profiling evaluation and paclitaxel production assessment in Taxus baccata L. cell cultures affected by mentioned elicitors. Results and Conclusion Gene expression levels were variably increased using methyl-β-cyclodextrin, and in some cases, a synergistic effect on transcript accumulation was observed when culture medium was supplemented with both elicitors. It was revealed that DBAT, BAPT, and DBTNBT are the most important rate-limiting enzymes in paclitaxel biosynthesis pathway in Taxus baccata L. cell suspension cultures under coronatine and methyl-βcyclodextrin elicitation condition. Moreover, PAM was identified as one of the important key genes especially in the absence of β-phenylalanine. In cell cultures affected by these elicitors, paclitaxel was found largely in the culture media (more than 90%). The secretion of this secondary metabolite suggests a limited feedback inhibition and reduced paclitaxel toxicity for producer cells. It is the result of the ABC gene relative expression level increment under methyl-β-cyclodextrin elicitation and highly depends on methyl-β-cyclodextrin's special property (complex formation with hydrophobic compounds). Paclitaxel biosynthesis was obviously increased due to the effect of coronatine and methyl-β-cyclodextrin elicitation, leading to the production level of 5.62 times higher than that of the untreated cultures.
Food Chemistry, 2021
The gold electrode was functionalized with anti-bisphenol A (BPA) aptamer and captured the BPA as... more The gold electrode was functionalized with anti-bisphenol A (BPA) aptamer and captured the BPA as analyte. By dropping the aptamer-modified magnetic Fe3O4/Au nanoparticles solution onto the electrode, a BPA molecule attaches to many aptamers that are in contact with a large number of Fe3O4/Au nanoparticles. The modified electrode were transferred to a solution containing Ag+ ions. Fe3O4/Au nanoparticles reduce the Ag+ ions to Ag0. A potential scan was applied for the oxidation of the Ag0-loaded magnetic nanoparticles to the AgCl. The magnitude of the stripping anodic signal of the Ag0 was related to the concentration of the BPA. The assay shows a detection limit of 0.6 fmol L-1 and linear range of 1 fmol L-1-150 pmol L-1 and. The applicability of the aptasensor is measured by its successful use in the sensing BPA in water, milk and juice samples and measuring BPA migration from different commercial plastic products.
Journal of Cluster Science, 2017
In this article, we deposited a layer of ZnO nanostructure doped with various concentrations from... more In this article, we deposited a layer of ZnO nanostructure doped with various concentrations from 0.0 to 4.0% volume percentage of aluminum and gallium on the glass substrate via sol-gel process and spin coating technique. The sol concentration that used for spin coating was 0.1 M. The thin films were analyzed by X-ray diffraction, scanning electron microscopy, UV-Vis spectrometer and resistivity measurement (four point probe) to investigate the structural, surface morphology, optical transmittance, and electrical properties of the thin films. Then the optimized layers were used in dye-sensitized solar cells. The sample with GZO/ AZO bilayer shows the 10.2 mA/cm 2 short circuit current density, 0.51 V open circuit voltage, 56% fill factor and 2.91% efficiency.
Journal of Nanostructures, 2018
Cobalt sulfide (CoS2) nanostructures were synthesized via a simple thermal decomposition method u... more Cobalt sulfide (CoS2) nanostructures were synthesized via a simple thermal decomposition method using [Co(oct)2] as a new precursor. Using the organometallic compound as precursor could synthesize materials in nano-scale because of having the massive structure that acted as capping agent. The products were characterized by various analyses such as X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fourier transform infrared (FT-IR) spectroscopy. Also, the optical properties of this product was investigated by photoluminescence spectroscopy (PL). However, band gap of CoS2 nanostructures was estimated about 2.2 eV in this work but CoS2 was considered as a metallic product in the former work. This difference may be related to quantum effects in nanomaterials. The photocatalytic activity of CoS2 nanoparticles was examined by decolorization of Erythrosine as an organic pollutant under UV irradiation and degradation percent of t...
Journal of Materials Science: Materials in Electronics, 2017
Journal of Molecular Liquids, 2017
In this work, we studied a new sensor to determine the ascorbic acid (AA) based on CeO 2 nanostru... more In this work, we studied a new sensor to determine the ascorbic acid (AA) based on CeO 2 nanostructures and multi-walled carbon nanotube on the pencil graphite electrode. For this purpose, different morphologies of CeO 2 nanostructures were synthesized via a simple hydrothermal method and their applications in the biosensors were investigated. Different parameters such as capping agent kind, hydrothermal time, and temperature on the product size and morphology were studied. The products were characterized via different analysis such as X-ray diffraction pattern (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Photoluminescence (PL), Fourier transform infrared (FT-IR), N2 adsorption (BET) and Cyclic Voltammetry (CV). The results showed that each parameter has a significant effect on the product size and morphology. This method showed appropriate responses to a trace amount of AA and the limit of detection was found to be 8 nmol L −1 for AA.
Journal of Materials Science: Materials in Electronics, 2016
In this experimental work different morphologies of the new Cu 2 CdI 4 /CuI nanocomposite were sy... more In this experimental work different morphologies of the new Cu 2 CdI 4 /CuI nanocomposite were synthesized via simple hydrothermal method. Different parameters such as CuI/CdI mole ratio, hydrothermal time and temperature were investigated on the product size and morphology. It was found that the product morphologies are dependent on these parameters, significantly. The crystallity and purity of the products were studied with X-ray diffraction pattern. It was found that the products are mainly composed nanocomposite and there were not any peaks related to other materials. The morphology of the products was investigated by SEM images and it was calculated that different parameters had a significant role in product size and morphology. The optical property of the product was obtained from diffuse reflectance spectroscopy. Finally, the photocatalytic activity of the nanostructure was investigated.
Journal of Cluster Science, 2015
In this study, lead molybdate (PbMoO4) nanostructures were synthesized successfully via a simple ... more In this study, lead molybdate (PbMoO4) nanostructures were synthesized successfully via a simple and fast co-precipitation method. A new lead precursor [pb(2-hydroxyacetophenone)]2 was used for synthesis of the product. It was seen that using lead complex led to create of very tiny structures that can be attributed its steric effect. Different parameters such as pH, surfactant kind and solvent were changed to study their effect on the product size and morphology. It was found each parameter can effect on the product shape and change particle size and morphology. Different analysis such as scanning electron microscopy, X-ray diffraction pattern, Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy were used to characterize the fabricated products. Also photocatalytic activity of the product was studied by UV–Visble spectroscopy and it was found that synthesized lead molybdate can act as photocatalyst under visible light range.
Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2014
ABSTRACT This study focuses on the preparation and characterization of single phase CuInS2 nanopa... more ABSTRACT This study focuses on the preparation and characterization of single phase CuInS2 nanoparticles with [diaquabis(salisylate)copper(II)], [Cu(Hsal)2(H2O)2] as precursor via microwave technique. Several effects on product morphology have been investigated, such as sulfur sources, solvent, power, and time of microwave. The products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-visible spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. Thin films CuInS2 were prepared by doctor's blade method and then studied via I-V characterization.
Materials Science in Semiconductor Processing, 2013
CuInS 2 microspheres were synthesized by Ultrasonic method in propylene glycol as solvent and cop... more CuInS 2 microspheres were synthesized by Ultrasonic method in propylene glycol as solvent and copper oxalate, indium chloride and thioacetamde (TAA) as precursors. Optimum conditions such as reaction time, solvent type, sulfur source, and ultrasonic power were determined. Then, a thin film of CuInS 2 was prepared and its application in solar cells was investigated. Photovoltaic characteristics such as V oc , J sc and FF were measured. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy were performed to characterize the CuInS 2 microsphere. The optical band gap of the CuInS 2 microsphere was estimated to be 2.28 eV.
Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2014
CoS2 nanostructures were synthesized successfully via hydrothermal approach with new precursor. T... more CoS2 nanostructures were synthesized successfully via hydrothermal approach with new precursor. The products were characterized with X-ray diffraction and scanning electron microscopy. The effect of different sulfur sources were investigated on product size and morphology.
Bulletin of Materials Science, 2014
CuInS 2 nanostructures were synthesized by sonochemical route using (bis(salicylate)copper(II)) a... more CuInS 2 nanostructures were synthesized by sonochemical route using (bis(salicylate)copper(II)) as a new copper precursor. The effects of different parameters such as sulphur source, solvent, power of irradiation and reaction time on the morphology of the products were investigated. Nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and Fourier transform infrared (FT-IR) spectroscopy. CuInS 2 nanostructures paste was prepared by doctor's blade technique on the transparent conductive oxide (TCO). The fill factor (FF), open circuit voltage (V oc), and short circuit current (I sc) were obtained by I-V characterization.
Materials Science in Semiconductor Processing, 2013
Copper indium sulfide, CuInS 2 , nanocrystals were synthesized by a new precursor complex, [bis(2... more Copper indium sulfide, CuInS 2 , nanocrystals were synthesized by a new precursor complex, [bis(2-hyroxyacetophenato)copper(II)], [Cu(HAP) 2 ], via a microwave method. The effects of sulfur sources, solvents, heating time and microwave power on morphology of product were investigated. The as-synthesized CuInS 2 nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) spectroscopy, and room temperature photoluminescence (PL) spectroscopy. The nanoparticles of CuInS 2 were used to prepare CuInS 2 film by doctor's blade technique. The fill factor (FF), open circuit voltage (V oc), and short circuit current (I sc) were obtained by I-V characterization.