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Open Access Article
1 - Application of nanozeolite technology in the removal of sulfate from the Gamasyab River
Amin Rezaei Hossein Babazadeh Amir Khosrojerdi Mahdi Sarai TabriziHuman activities, the presence of salts in riverbeds and runoff, as well as pollutants carried by the air lead to the contamination of rivers as one of the main sources of water supply. In this study, the Gamasayab River was selected and sampling was conducted at 16 des MoreHuman activities, the presence of salts in riverbeds and runoff, as well as pollutants carried by the air lead to the contamination of rivers as one of the main sources of water supply. In this study, the Gamasayab River was selected and sampling was conducted at 16 designated points for three-time intervals in the most polluted location with the highest pollutant levels compared to other stations after spectrophotometric testing of the samples, in different seasons of the year. The collected samples were transported to the laboratory for measurement and determination of the target pollutant levels. Then, they were simulated using natural and modified zeolite nanoparticles for the purpose of purification. In the following, using the Design Expert model and assuming two factors, pH and absorbent-to-pollutant ratio, the optimal absorption points were determined, and the theoretical absorption values were also obtained. The research results showed that the absorption efficiency for the modified sample with 0.2 M nitric acid and sulfuric acid was estimated at 77%. From the investigation of the interaction between sulfate and three other pollutants including phosphate, nitrate, and iron, which was investigated by simulating the solution and in order to neutralize the effect of other dissolved substances, it was found that phosphate and nitrate ions led to a decrease in sulfate ion absorption by the absorbent, while iron ions increased the absorption of sulfate by the absorbent. The simulation results of the proposed model also indicated that the optimal absorption point for the absorbent was at a pH of 9.6 and a D/C value of 17.01, resulting in an absorption of the pollutant by 5.86%. Finally, the Freundlich isotherm was chosen for this absorbent with a coefficient of determination of 0.92 as the superior isotherm compared to the Langmuir isotherm with a coefficient of determination of 0.79. Manuscript profile -
Open Access Article
2 - The evaluation of antibacterial activity of TiO2 nanoparticles , EDTA and garlic on standard strain of Pseudomonas aeroginusa by microdilution method
مینا سعادت شهلا رودبارمحمدی رمضانعلی خاوری نژاد الهام تقویImportance of microbial contamination in food industrial is always important health problemespecially in high risk population such as children and old individual. TiO2 nanoparticles wereobtained through the hydrolysis of TiCl4 (Titanium tetrachloride).It was slowly adde MoreImportance of microbial contamination in food industrial is always important health problemespecially in high risk population such as children and old individual. TiO2 nanoparticles wereobtained through the hydrolysis of TiCl4 (Titanium tetrachloride).It was slowly added intodistilled water under constant rotation for 5 hours. This Solution was dried at the 80-100 0C andcalcinated at the 5500C. Size and type of these Nanoparticles were characterized by scanningelectron microscope (SEM) and X-Ray-: Diffraction (XRD) pseudomonas aeroginusa strain(ATCC 27853) were cultured on nutrient agar medium (NA) for 24h at 370C. Suspension byconcentration 1×106 cells/ml was prepared. Minimum Inhibitory Concentration (MIC) test forTiO2 and EDTA and garlic were evaluated.Evaluation of Morphology and diameter of the TiO2 nanoparticles with SEM showed thatnanoparticles were spherical with diameter between 40-65nm. MIC of TiO2 and EDTA andgarlic on pseudomonas aeroginusa ATCC27853 were 2/2, 24/92 and 40 μg/ml respectively.In this study we synthesized the TiO2 nanoparticles with chemical method and showed that ithas antimicrobial activity compared with garlic, EDTA and positive control, so it couldeliminate Pseudomonas aeroginusa in field of food industrial specially in packaging. Manuscript profile -
Open Access Article
3 - مقایسه‌ی اثرات ضد قارچی فلوکونازول و نانوفلوکونازول بر روی درماتوفیت‌های حیوان‌گرای جدا شده از انسان و حیوان
, N Musavi Bafrui , SJ Hashemi , M Bayatیکی از شایع‌ترین عفونت‌های قارچی در انسان و حیوانات درماتوفیتوزیس می‌باشد. امروزه در برخی موارد بیماری، مقاومت‌های دارویی و درمانی در برابر داروهای رایج مشاهده شده است لذا طراحی و استفاده از داروهای ضد قارچی جدید جهت درمان این بیماری ضروری به نظر میرسد. در این مطالعه فر Moreیکی از شایع‌ترین عفونت‌های قارچی در انسان و حیوانات درماتوفیتوزیس می‌باشد. امروزه در برخی موارد بیماری، مقاومت‌های دارویی و درمانی در برابر داروهای رایج مشاهده شده است لذا طراحی و استفاده از داروهای ضد قارچی جدید جهت درمان این بیماری ضروری به نظر میرسد. در این مطالعه فرم نانوفلوکونازول دارو طراحی و تست‌های حساسیت دارویی برای گونه‌های‌ی درماتوفیتی انجام شد. از بیماران مشکوک به درماتوفیتوزیس آزمایش مستقیم و کشت به عمل آمد و درماتوفیت‌های جدا شده توسط تعیین توالی ژنومی ناحیه‌ی ITS1-5.8S-ITS2 تعیین هویت شدند. تست حساسیت دارویی برای ایزوله‌های درماتوفیتی با پروتکل استاندارد CLSI M38-A2 انجام گردید و MIC50 و MIC90برای هر گونه محاسبه شد. 47 مورد کلنی درماتوفیت شناسایی شد که شامل 23 مورد ترایکوفایتون منتاگروفیتس، 12 مورد ترایکوفیتون وروکوزوم و 12 مورد میکروسپوروم کنیس بود. نتایج MIC50 برای ترایکوفایتون منتاگروفیتس، ترایکوفیتون وروکوزوم و میکروسپوروم کنیس به ترتیب برابر با 32، 32 و 8 میکروگرم بر میلی‌لیتر برای فلوکونازول و 8، 16 و 4 میکروگرم بر میلی‌لیتر برای نانوفلوکونازول و همچنین MIC90 برای این سه گونه به ترتیب 64، 64 و 16 میکروگرم بر میلی‌لیتر برای فلوکونازول و 16، 32 و 8 میکروگرم بر میلی‌لیتر برای نانوفلوکونازول بدست آمد. نتیجه‌گیری: فرم نانوفلوکونازول در مقایسه با فرم معمول فلوکونازول دارای مقادیر MIC پایین تری در برابر گونه‌های حیوان‌گرای درماتوفیت می‌باشد و در غلظت‌های پایین‌تری از دارو باعث مهار رشد درماتوفیت‌ها شد. Manuscript profile -
Open Access Article
4 - Comparison of CYP51A gene expression of Aspergillus fumigatus isolates against fluconazole and nano-fluconazole
Sarrafha Sarrafha, S.J. Hashemi Hazaveh S. Rezaei M. Bayat,Aspergillosis is an opportunistic fungal infection in animals. The disease is mainly respiratory, but other disease manifestations also occur in poultry. Researchers have shown that, one of the reasons for the increase in drug resistance in Aspergillus species is the ov MoreAspergillosis is an opportunistic fungal infection in animals. The disease is mainly respiratory, but other disease manifestations also occur in poultry. Researchers have shown that, one of the reasons for the increase in drug resistance in Aspergillus species is the overexpression of the CYP51A gene. This study compared CYP51A gene expression of Aspergillus fumigatus isolated from poultry against fluconazole and nano-fluconazole. Fluconazole liposomal-nanoparticles were prepared by the thin layer hydration method. We dissolved 5.12 mg of fluconazole powder in 1 ml of sterile distilled water and 6 ml of chloroform-methanol organic solvent. We added 51 mg of lecithin and 5 mg of cholesterol to it. The size of nanoparticles was 88.9±12.1 nm and the surface charge of these nanoparticles was -20.12±1.88 mv. We also used a Scanning-Electron Microscope to study the structure of nanoparticles. Thirty samples of A. fumigatus were collected from poultry lung nodules. Minimum inhibitory concentration (MIC) was performed by standard Broth Microdilution method according to NCCLS-M38A2 to evaluate the MIC of fluconazole and nano-fluconazole against isolates. We selected two high-resistance isolates to fluconazole and used them to determine the CYP51A gene expression level by real-time PCR. The results showed that nano-fluconazole had a lower MIC than fluconazole and in lower concentrations of the drug inhibited the growth of Aspergillus fumigatus isolates. CYP51A gene expression was increased in fluconazole and nano-fluconazole-treated isolates compared to the untreated state. Conversely, a decrease in CYP51A gene expression was observed in the exposure to nano-drug compared with the normal drug. Manuscript profile -
Open Access Article
5 - Antioxidant effect of copper nanoparticles coated with Artemisia annua plant extract in the 2nd degree burns in mice
فرزانه Tavakoli بهناز Karimi babaahmadi موسی Javdani جهانگیر KaboutariBurns trigger intricate inflammatory processes and the generation of free radicals. The anti-inflammatory, antioxidant, and antibacterial characteristics of the Artemisia annua plant have a significant potential for enhancing the healing process for wounds. This study e MoreBurns trigger intricate inflammatory processes and the generation of free radicals. The anti-inflammatory, antioxidant, and antibacterial characteristics of the Artemisia annua plant have a significant potential for enhancing the healing process for wounds. This study examines the impact of an Artemisia annua extract-coated copper nanoparticle ointment on the antioxidant enzyme activity in second-degree burns in mice. After the green synthesis of coated copper nanoparticles, 100 male mice were divided into five groups: control without treatment, eucerin ointment group, 0.2% copper nanoparticle ointment, 0.2% copper nanoparticles coated with Artemisia annua extract ointment, and 5% Artemisia annua extract ointment. The activity of antioxidant enzymes and the level of lipid peroxidation in tissue homogenates were measured on days 14, 7, 3, and 21. SOD, CAT, and GPX activities were all significantly higher on day 7 in the coated copper nanoparticle ointment group compared to the control group (P˂0.05). The level of MDA was also significantly lower in the control group on days 7, 14, and 21 (P 0.05). The extract of the medicinal plant Artemisia annua is useful for making and coating copper nanoparticles. In addition to the advantages of plant extract, copper nanoparticles have a synergistic impact that speeds up the healing of second-degree burn wounds in mice by lowering lipid peroxidation in wound tissue and boosting antioxidant activity. Manuscript profile -
Open Access Article
6 - Three years effect of iron and magnesium nano-particles on the stability of aggregates and some soil chemical properties
Elahe Daraei Hossein Bayat Pouya ZamaniLittle is known about the long term effects of nanoparticles on soil properties. Therefore, the objective of this study was to investigate the three years effects of nanoparticles on aggregate stability and some of the soil chemical properties. Different amounts (1, 3 a MoreLittle is known about the long term effects of nanoparticles on soil properties. Therefore, the objective of this study was to investigate the three years effects of nanoparticles on aggregate stability and some of the soil chemical properties. Different amounts (1, 3 and 5 percentage by weight) of two types of nanoparticle of metal oxides, MgO and Fe3O4 were mixed with a loamy soil in three replications and their possible effects on different properties of the soil after three years were investigated. The results showed that application of nanoparticles, increased the pH of the soil from 7.7 in the control to 8.1- 9.3 and the electrical conductivity from 0.31 in the control to 0.34 -0.56 dSm-1, due to the increase in the alkali cations. The percentage of calcium carbonate increased from 19.75% in the control to 20.5-22.7% due to the accumulation of nanoparticles in the soil, with the highest increase in three variables with 5% magnesium nano oxide. 3% nano iron oxide significantly increased the cation exchange capacity from 23.50 in the control to 24.28 cmolc/kgsoil. Also the nanoparticles increased the mean weight diameter, due to their high specific surface area, with the greater effect of magnesium nano oxide (increased from 33 to 1242 percentage compared to the control) than iron nano oxide (increased from 97 to 173 percentage compared to the control). In general, the results of this study showed that, nanoparticles with specific physico-chemical properties can affect some properties of soil. Manuscript profile -
Open Access Article
7 - The Antimicrobial Effect of Chitosan Nano Particles Film on Two Species of Food Bacteria
P. Rezaee روحا Kasra KermanshahiIntroduction: Unbiodegradable materials used in food packaging and the microbial contaminants derived from this might create problems in our society. The application of biodegradable material that might have antimicrobial activity is desirable and is considered a priori MoreIntroduction: Unbiodegradable materials used in food packaging and the microbial contaminants derived from this might create problems in our society. The application of biodegradable material that might have antimicrobial activity is desirable and is considered a priority for the researchers. Chitosan is a biopolymer that eliminates these problems. Materials and Methods: In this study, chitosan nanoparticles and chitosan films were prepared and physical and chemical characteristics of these were determined and the antimicrobial effects against Staphylococcus aureus PTCC 1431 and Listeria monocytogenesusing different methods were assessed. Results: The size of chitosan nanoparticle was 273 nm with MIC and MBC of 3.5 for these bacteria. Synthezied chitosan film with 43.69 ± 2.4 mm of thickness, 1% of moisture content and 52% film solubility caused a reduction of 100% in the number of food pathogenic bacteria in 24 hoursat 30°C. Conclusion: Since chitosan is a biodegradable polymer and has antimicrobial activity in the form of chitosan nanoparticle and film against food pathogenic bacteria (Staphylococcus aureus PTCC 1431 and Listeria monocytogenes), it might be employed in the packaging industry particularly food. Manuscript profile -
Open Access Article
8 - The Effect of ZnO Nanoparticles on the Growth of Bacillus subtilis and Escherichia coli O157:H7
hakimeh esmaielzadeh parvaneh sangpour ramin khaksar farzaneh shahrazIntroduction: Recently antimicrobial nanoparticles such as ZnO have attracted the attentions of scientists. Regarding the antimicrobial effect and low cost of ZnO nanoparticles, these might be emplyed in food industry to reduce the growth of food microorganisms. The obj MoreIntroduction: Recently antimicrobial nanoparticles such as ZnO have attracted the attentions of scientists. Regarding the antimicrobial effect and low cost of ZnO nanoparticles, these might be emplyed in food industry to reduce the growth of food microorganisms. The object of this study is to evaluate the antibacterial effect of ZnO nanoparticles on Bacillus Subtilis and E.Coli O157:H7, two important spoiling and pathogenic bacteria of food.Materials and Methods: ZnO nanoparticles have been synthesized by molten salt method and have been characterized by X-ray diffraction, and scanning electron microscopy. Bacillus Subtilis and E.Coli O157:H7 have been inoculated in 2% and 4% w/w ZnO containing tryptic soy broth followed by the plot of their growth curve.Results: Treatments with both 2% and 4% concentrations of ZnO nanoparticles significantly reduced the number of E.Coli O157:H7 (p=0.001 and p Conclusion: Regarding the results of the present study, ZnO nanoparticles can significantly reduce the number of both bacteria however it seems that the effect for gram negative bacteria might be more dramatic. Manuscript profile -
Open Access Article
9 - Determination of the Antioxidant Activity of Calendula officinalis Extract and its Role in Synthesis of ZnO Nanoparticles
F. Nematollahi F. Taheri Konjini F. Zamani HergalaniIntroduction: The synthesis of zinc oxide nanoparticles is valuable due to its applications in the packaging and food industries as permitted additives to increase the shelf life.Materials and Methods: In this research, the synthesis of green nanoparticles of zinc MoreIntroduction: The synthesis of zinc oxide nanoparticles is valuable due to its applications in the packaging and food industries as permitted additives to increase the shelf life.Materials and Methods: In this research, the synthesis of green nanoparticles of zinc oxide were performed by zinc acetate dihydrate. Calendula officinalis extract was used as reducing and stabilizing agent. The prepared ZnO NPs were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), Energy dispersive X- ray (EDX) and X-ray diffraction (XRD) analysis.Results: The size of nanoparticles prepared by Calendula officinalis extract was obtained at 8 to 22nm In addition, the antioxidant properties of prepared nanoparticles were analyzed in the terms of total phenolic and flavonoid content. The antioxidant activity of zinc oxide nanoparticles was evaluated using 2,2- diphenyl picryl hydrazyl (DPPH) method. Gallic acid was used as standard to draw the calibration curve. The amount of total phenolic compounds in aqueous extract of the plant was 303 mg of gallic acid per gram.Conclusion: Calendula officinalis extract showed high antioxidant activity and great potential for green synthesis of nanoparticles. The average diameter of nanoparticles synthesized without plant extract as a stabilizer, was larger than the green synthesized one (more than 18 nm). There was also less agglomeration in nanoparticles synthesized by Calendula officinalis extract. Manuscript profile -
Open Access Article
10 - Evaluation of Optimization Removal of Methyl Orange from Aqueous Solutions with Ag, Co/TiO2 Nano-Particles by Experimental Design
Nasim Ziaefar Saber Khodaei Jila Talat-Mehrabad Farzad Arjomandi RadBackground and objective: Studying photocatalytic activities, some factors including the concentration of the pollutant, the amount of photo-catalyst, pH, and calcination temperature affect the process of eliminating the pollutant from aquatic solutions. Using an experi MoreBackground and objective: Studying photocatalytic activities, some factors including the concentration of the pollutant, the amount of photo-catalyst, pH, and calcination temperature affect the process of eliminating the pollutant from aquatic solutions. Using an experimental design, it is possible to eliminate the unnecessary factors and determine the optimal conditions. Method: The Ag, Co/TiO2 Nano-particles for eliminating methyl orange has been evaluated. The four main variables involved in the process of elimination of methyl orange are the original concentration of the pollutant, the doges of photo-catalyst, pH, and calcination temperature. So arraying four factors changes at 3 levels. Therefore, considering the surface conditions for optimization and for determining the effect of each factor, totally 9 experiments are needed. Findings: The effect of the operational parameters include the original concentration of the pollutant, the amount of the photo-catalyst, pH, and calcination temperature, was optimized through experimental design. Discussion and Conclusion: The results of the experiments on photochemical degradation of Methyl Orange using Taguchi method showed that the greatest effect is related to original concentration of the MO and the amount of the Nano-catalyst. Manuscript profile -
Open Access Article
11 - Histological effects of feeding with different sources of zinc and iron (nano-particles and mineral form) in common carp (Cyprinus carpio)
hasan sahraei Seyyed Aliakbar Hedayati Sarallah Yarmohammadi Barbarestani Mohammad FakhrianBackground and Objective: With the development of nanotechnology and materials science, however, these materials also have been used increasingly with the potential toxic effects of many unknown substances and many nano-particles were built with new properties and new d MoreBackground and Objective: With the development of nanotechnology and materials science, however, these materials also have been used increasingly with the potential toxic effects of many unknown substances and many nano-particles were built with new properties and new despite. Therefore, in this study the effects of feeding with different sources of iron and zinc in the tissue of common carp (Cyprinus carpio) were measured. Material and Methodology: For this purpose, 420 common carp (with an average initial weight 45±4.7 g) was prepared, the fish sterilization and adapted to the laboratory conditions for 10 days. Then fish were randomly divided into seven groups, the first group was considered as control groups respectively and other fish received values of 10, 50 and 100 micrograms of iron and zinc nano-particles per gram of food for 60 days. Findings: Microscopic studies of organs (liver, kidney) study showed that increasing the concentration of nano-materials could have more evenly histopathological lesions in the liver tissue and cells. In the medium and low concentrations of both nano-particle and in high doses of iron nano-particles, by removing the inducer tissues could again resume their physiological activity, but in high doses, unlike the iron nano-particles, the repair tissue was not resumable. Discussion and Conclusion: From the above results it can be concluded that increasing the concentration of the nano-particles could increase tissue damage and can be considerable factors. Manuscript profile -
Open Access Article
12 - بررسی تاثیر مستقیم نانوذره اکسید منیزیوم روی ویروس تب برفکی در شرایط آزمایشگاهی
سولماز رفیعی سیده الهام رضا توفیقی محمد رعایایی اردکانی امید مددکار -
Open Access Article
13 - بررسی اثرات ضد میکروبی و برآورد پتانسیل ضد سرطانی نانوذرات نقره سنتز شده به روش سبز با استفاده از عصاره زوفا بر روی رده‌های سلولی مختلف (A549، MCF-7 و Hela)
شبنم شماعی ریحانه سزاری همانکوه -
Open Access Article
14 - Investigation of Electrical Properties, Response and Recovery of Capacitive Nanosensors with Metal-Oxide-Semiconductor Structure for Hydrogen Gas Detection
G. Behzadi Pour L. Fekri Aval -
Open Access Article
15 - Investigation of radar absorption in magnetite- poly pyrrole/epoxy nanocomposites
K. Kolahgar M. Mashadi J. Fahim -
Open Access Article
16 - Preparation and Characterization of Pd Supported On Nano Zeolite as a Hetrogeneous catalyst for Ullmann Coupling Reaction
A. Alizadeh M.A. Khalilzadeh E. Alipour A. Esmaeili -
Open Access Article
17 - Palladium Anchored to Clinoptilolite as a Novel and Efficient Nanocatalyst for Suzuki Coupling Rection
A. Alizadeh M.A. Khalilzadeh D. Zareyee -
Open Access Article
18 - The Effect of Ethanol Extraction of Aloe vera on Certain Biomarkers of Cardiovascular Disease in Mice Treated with Nanoparticles of Titanium Dioxide
Fereshteh Javan Masoomi Jila Talat Mehrabad Roghayeh Babri BonabInroduction & Objective: The effect of ethanol extraction of Aloe vera on certain biomarkers of cardiovascular disease in mice treated with titanium dioxide nanoparticles was studied.Material and Methods: Mice were received titanium dioxide nanoparticles with density of MoreInroduction & Objective: The effect of ethanol extraction of Aloe vera on certain biomarkers of cardiovascular disease in mice treated with titanium dioxide nanoparticles was studied.Material and Methods: Mice were received titanium dioxide nanoparticles with density of 100 milligrams per kg and ethanol extraction of aloe vera plant with density of 100, 200 and 300 milligrams per kg for 30 days. Plasma levels ofmalondialdehyde, rich sialic acid, troponin I and creatine kinase MB at the end of treatment was evaluated. The antioxidant activity of ethanol extraction in Aloe Vera using free radical DPPH and total phenol levels were considered.Results: The results showed that giving titanium dioxide nanoparticles through the stimulation of oxidative activity had a significant increase in plasma levels of malondialdehyde (MDA). Plasma levels of troponin I, creatine kinase MB and rich sialic acid also significantly increased. With increasing density of aloe vera, the total phenol and antioxidant activity of ethanol extraction increased. Giving the extraction significantly reduced the plasma levels of biomarkers of cardiovascular damage in mice treated with titanium dioxide nanoparticles.Conclusion:According to the results, ethanol extraction of aloe vera as an antioxidant compound is able to reduce the levels of cardiovascular damage in mice treated with titanium dioxide nanoparticles. Manuscript profile -
Open Access Article
19 - Investigation of the effect of silica nanoparticles with the pathogenic fungus Beauveria bassiana on the greenhouse whitefly, Trialeurodes vaporariorum Westwood
SEYYED KAZEM Vahedi A. Hoseinzadeh Akbar Ghassemi-KahrizehIntroduction: Greenhouse whitefly, as an economic pest, has a wide and ubiquitous host range and causes great damage to many crops, including greenhouse plants. Due to the morphological characteristics and potential of resistance to chemical toxins, it is necessary to f MoreIntroduction: Greenhouse whitefly, as an economic pest, has a wide and ubiquitous host range and causes great damage to many crops, including greenhouse plants. Due to the morphological characteristics and potential of resistance to chemical toxins, it is necessary to find suitable and compatible compounds for integrated control of this pest by increasing the effect and minimizing the adverse effect on the pathogenic fungus Beauveria bassiana.Methods: In this study, the effect of pathogenic fungus Beauveria bassiana alone and in combination with silica nanoparticles against second instar seeds and nymphs of Trialeurodes vaporariorum Westwood and germination power of pathogenic fungi using probit analysis, one-way analysis of variance and ANOVA SPSS software was examined.Results: LC50 values obtained from probit degradation as a result of the effect of different concentrations of silica nanoparticles and Beauveria bassiana against eggs after 7 days and against second instar nymph after 72 hours (643.97 mg / L and 170399 conidia/ ml) and (602.952 mg / L and 78379 conidia/ ml) were obtained, respectively.Results: According to the results of the present study, silica nanoparticles alone have higher toxicity than other treatments and in combination with B. bassiana can be used in integrated control of the important greenhouse whitefly pest. The most important advantage of using these compounds is their compatibility with the environment and the lack of resistance to insects against them. Manuscript profile -
Open Access Article
20 - اثر رژیمهای کم آبیاری و نانوذرات سیلیکا بر عملکرد و شاخص بهرهوری آب در گیاه کاهو (Baby lettuce Vivian)
شکور طافی عبدالرحیم هوشمند ناصر عالم زاده انصاریرشد جمعیت و افزایش مشکلات زیست محیطی، تقاضای آب آبیاری در بسیاری از مناطق جهان را افزایش داده است. فناوری نانو تاثیرات زیادی در تولید پایدار محصولات کشاورزی داشته و می‎تواند خطرات زیست محیطی را کاهش داده و فرصت‎هایی برای تولید محصولات جدید فراهم کند. این تحقیق ب Moreرشد جمعیت و افزایش مشکلات زیست محیطی، تقاضای آب آبیاری در بسیاری از مناطق جهان را افزایش داده است. فناوری نانو تاثیرات زیادی در تولید پایدار محصولات کشاورزی داشته و می‎تواند خطرات زیست محیطی را کاهش داده و فرصت‎هایی برای تولید محصولات جدید فراهم کند. این تحقیق با هدف بررسی عملکرد و بهره­وری مصرف آب تحت شرایط رژیم­های کم­آبیاری و نانوذره سیلیکا انجام شد. مطالعه حاضر بر روی گیاه کاهو رقم baby lettuce Vivian در سه سطح ­آبیاری 75، 85 و 100 درصد نیاز آبی گیاه، سه سطح کاربرد نانوذره شامل: 0، 50 و 100 میلی­گرم بر لیتر به صورت تغذیه ریشه­ای در سه تکرار انجام شد. این طرح در قالب کرت­های خرد شده نواری و با طرح پایه بلوک­های کامل تصادفی تحلیل شد. براساس نتایج، بیش­ترین میزان پارامتر عملکرد کل به ترتیب در تیمار I100F100برابر 88/87 گرم بر بوته و کم­ترین میزان در تیمار I85F50با 47 گرم بر بوته به ثبت رسید. هم­چنین بالاترین عملکرد زیست­توده در تیمار I100F50 ثبت شد که برابر 33/61 گرم بر بوته بود و پایین­ترین عملکرد زیست­توده نیز در تیمار I75F100 گزارش گردید که برابر 26 گرم بر بوته بود. تیمار I100F50 با 53/20 کیوگرم بر مترمکعب بیش‎ترین بهره­وری مصرف آب را داشت. بالاترین و پایین­ترین شاخص برداشت در این پژوهش، به­ترتیب برابر 68/74 و 61/52 درصد بود. Manuscript profile -
Open Access Article
21 - The effect of green silver nanoparticles on spinach (Spinacia oleracea) seed germination under salt stress
Amin Ali Naghi Zadeh Mehrnaz Mahmoudi Zarandi Sayed Mohammad Reza Khoshroo Fatemeh Hasan ZadehSalinity is one of the most important abiotic stresses for plants and its adverse effects on different stages of plant growth and yield have been reported. Salinity can reduce seed germination as the most sensitive stage of plant growth. The use of silver nanoparticles MoreSalinity is one of the most important abiotic stresses for plants and its adverse effects on different stages of plant growth and yield have been reported. Salinity can reduce seed germination as the most sensitive stage of plant growth. The use of silver nanoparticles has been suggested to improve the germination of some plants in salinity conditions. On the other hand, consuming spinach is highly recommended due to its high nutritional value. In this study, aloe vera extract was used for synthesis of silver nanoparticles. Then, the effects of salinity on seed germination of spinach and the role of silver nanoparticles on seed germination indices in this plant were investigated. The formation of silver nitrate nanoparticles was investigated using a spectrophotometer, XRD analysis, and electron microscopy. Spherical nanoparticles, with an average size of 11.97 nm to 29.46 nm were observed. Treatments in a completely randomized design with three replications of green silver nanoparticles at concentrations of 10, 20, 40, 80 and 100 ppm and salinity at four levels of 0, 50, 100 and 150 mM on spinach seed germination process were investigated . The results showed that the germination process under salinity conditions decreased significantly compared to the control group. Treatment of 40 ppm concentration of silver nanoparticles for different levels of salinity had a significantly increased effect on germination indices at 1% level . Manuscript profile -
Open Access Article
22 - Effect of silver nanoparticles on surface hydrophobicity and biofilm formation in Staphylococcus aureus, Acinetobacter baumannii, Pseudomonas aeruginosa and Escherichia coli
alireza Farazandeh Fatemeh Noorbakhsh Sahar Honarmand JahromiIntroduction: Biofilms are microbial aggregates that adhere to a substrate as a surface and are surrounded by an exopolysaccharide matrix. The bacteria that make up biofilms are so resistant to antimicrobials and antibiotics that this has led to concerns in the medical MoreIntroduction: Biofilms are microbial aggregates that adhere to a substrate as a surface and are surrounded by an exopolysaccharide matrix. The bacteria that make up biofilms are so resistant to antimicrobials and antibiotics that this has led to concerns in the medical community.The aim of this study was effect of silver nanoparticles on surface hydrophobicity and biofilm formation in Staphylococcus aureus, Acinetobacter baumannii, Pseudomonas aeruginosa and Escherichia coli. Methods: This study was performed on 40 bacterial strains including Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli and Acinetobacter baumannii isolated from Milad Hospital in Tehran. The strains were identified by biochemical tests. Also, biofilm formation by microtiter plate method, surface hydrophobicity by MATH method and sensitivity of strains to silver nanoparticles were evaluated.Results: According to the results obtained in this study, all strains were able to form biofilms and no strains with negative biofilms were observed in the study. The highest effect of silver nanoparticles in this study was observed on strains at concentrations of 0.5, 1 and 2 μg / ml. Also, only 20% of Pseudomonas aeruginosa strains in this study were observed with moderate hydrophobicity and the others of the bacteria were weakly hydrophobic.Conclusion: silver nanoparticles in low concentrations with the effect of low toxicity had the ability to inhibit the biofilm formation of Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Acinetobacter baumannii. Hydrophobicity in the studied bacteria were weak. Manuscript profile -
Open Access Article
23 - Green production of silver nanoparticles from )Eryngium planum( and its antimicrobial effect on )Escherichia coli( and )Staphylococcus aureus(
zahra khoshhal Atoosa Vaziri rahele rahbarianBackground: The development of nanotechnology in the last decade has opened a new and unique window to science; Among them, silver nanoparticles are one of the most important types of nanoparticles due to their antimicrobial properties. There are different methods for p MoreBackground: The development of nanotechnology in the last decade has opened a new and unique window to science; Among them, silver nanoparticles are one of the most important types of nanoparticles due to their antimicrobial properties. There are different methods for producing silver nanoparticles by green synthesis. Using plant extracts to produce silver nanoparticles is a cheap and cost-effective method that does not harm the environment.Objective: In this research, the phytochemistry of the plant and the production of silver nanoparticles using the leaves of )Eryngium pulegium( were studied. Also, the antibacterial effect of the resulting nanoparticles was investigated on Escherichia coli and Staphylococcus aureus bacteria.Methods: First, secondary metabolites including phenol, flavonoids, terpenoid and alkaloids were measured. Then, the amount of antioxidant activity of Chuchag) Eryngium pulegium) plant extract was measured by DPPH method and after confirming the presence of antioxidant property and high amount of secondary metabolites in the examined plant, the synthesis of silver nanoparticle was carried out by aqueous extract of Chuchag plant)Eryngium pulegium( and by spectrophotometry and SEM methods. TEM confirmed the presence of nanoparticles and determined the size and shape of nanoparticles. Then, the antibacterial property of the extract along with nanoparticles was evaluated on two species of bacteria, Escherichia coli and Staphylococcus aureus.Findings: The analysis of secondary metabolites in (Eryngium pulegium) plant showed that the main and indicative compounds in (Eryngium pulegium) essential oil include terpenoids curcumin, gamma-3 carne, beta gorgonen, alpha guain, gamma cadinene, alpha terpinen, etc. The results of LC.MS of alkaloids showed that Eryngium pulegium has 4 alkaloid compounds in order of highest concentration, berbamine, coxoline, balochistin and fikamin. The results related to DPPH in (Eryngium pulegium) plant showed that as the concentration of ( Eryngium pulegium) extract increased, its free radical inhibition percentage also increased, so it can be proved that Eryngium pulegium has free radical inhibitory properties. It also has antioxidant properties. Vis-UV spectroscopic analysis and the presence of a peak at 370 nm indicated the biosynthesis of these nanoparticles in (Eryngium pulegium) extract, and the SEM image determined the shape of the nanoparticles to be spherical and their average size around 20 nm. In the investigation of the antibacterial effect of nanoparticles biosynthesized with (Eryngium pulegium) extract against microbial bacteria, the nanoparticles showed a good antibacterial effect against the studied bacteria. In the MIC test on Staphylococcus aureus bacteria, the minimum inhibitory concentration in(Eryngium Manuscript profile -
Open Access Article
24 - Antibacterial activity of zinc aluminate nanoparticles against foodborne pathogenic bacteria of E. coli and P. aeruginosa
A. Taheri M. Ziaadini M. GahramzeiMaterials in nanoscale dimensions have a high surface-to-volume ratio, and thus have better reactions with other materials. The development of nanotechnology over the past decades has opened up opportunities for discovering the antibacterial effects of metallic nanopart MoreMaterials in nanoscale dimensions have a high surface-to-volume ratio, and thus have better reactions with other materials. The development of nanotechnology over the past decades has opened up opportunities for discovering the antibacterial effects of metallic nanoparticles. In this study, the antibacterial properties of nanoparticles on aluminate (ZnAl2O4) were studied on Escherichia coli and Pseudomonas aeruginosa bacteria. Antibacterial activity was assessed by using the disk diffusion method on agar using nanoparticles on synthesized aluminate. The non-growth halo diameter indicates the sensitivity of bacteria to antimicrobials. The minimum inhibitory concentration of bacterial growth (MIC) and minimum bacterial leaching concentration (MBC) was measured by microdilution in sterile tubes. Statistical analysis was done by T-test. The results of this study showed that Pseudomonas aeruginosa sensitivity (16.06±1.8mm) was higher than E. coli (11.64±2.2mm) (p < 0.05). The minimum inhibitory concentration (MIC) and bactericidal concentration MBC of bacteria Pseudomonas aeruginosa and Escherichia coli bacteria MIC and MBC was lacking. According to the results obtained in this study, we conclude that Pseudomonas aeruginosa was more sensitive to alumina than that of E. coli against nanoparticles. Manuscript profile -
Open Access Article
25 - Effects of selenium nanoparticles and sodium selenite on expression of adiponectin gene in placenta of pregnant ewes.
Pedram Moayeri Gholam ali Kojouri Afshin Jafari dehkordi Ali mohammad Ahadi Mahsa AbolfazlzadehIn recent years, special attention has been paid to insulin resistance mediators, such as adiponectin, that is produced and expressed during conception in placental tissue, thereby inducing its effects on the growing embryo and the health of the mother.In this study, th MoreIn recent years, special attention has been paid to insulin resistance mediators, such as adiponectin, that is produced and expressed during conception in placental tissue, thereby inducing its effects on the growing embryo and the health of the mother.In this study, the effect of selenium nanoparticles and sodium selenite on transcription of placental adiponectin gene was investigated for the first time during the transitional period. For this purpose, 20 pregnant ewes were selected randomly. During the 10 days leading up to birth, oral administration of selenium nanoparticles (Se NPs) with dosages of 0.05 and 0.10 mg/kg B.W. and sodium selenite with dosage of 0.1 mg/kg B.W. was performed. At the same time, the control group received equal volume of distilled water. At parturition, placental samples were collected and the transcription rate of adiponectin gene was determined by using RT-PCR based on a comparison assay of 2-ΔΔCt.The results showed that selenium supplementation in pregnant ewes leads to a significant reduction in adiponectin gene transcription rate and the suppressive role of selenium nanoparticles was significantly superior to sodium selenite. Manuscript profile -
Open Access Article
26 - The comparative effect of selenium nanoparticles and sodium selenite supplementation in transitional period on serum thyroxin level of neonatal lambs
Vahid Tabatabaei Gholamali Kojouri Afshin Jafari Abdonaser MohebiThe objective of the present study was to study the comparative effect of administering selenium nanoparticles and sodium selenite in pregnant ewes on the blood serum levels of thyroxin in newly born lambs. For this purpose, twenty, four-month pregnant ewes within the s MoreThe objective of the present study was to study the comparative effect of administering selenium nanoparticles and sodium selenite in pregnant ewes on the blood serum levels of thyroxin in newly born lambs. For this purpose, twenty, four-month pregnant ewes within the same age were used. During the 21 days leading up to birth, supplementation of selenium nanoparticles (Se NPs) with dosages of 0.05 and 0.10 mg/kg B.W. were respectively fed to treatment groups 1 and 2. And supplementation with sodium selenite with dosage of 0.1 mg/kg B.W. was fed to treatment group 3. At the same time the control group was fed distilled water in equal volume. The ewes were monitored under accurate laboratory and clinical examination until the time of delivery. Neonatal lamb serum thyroxin level was measured at the day zero (birth day) and also at the 7th day. The results indicated that serum thyroxin level of neonatal lambs of treated groups 1 and 3, decreased significantly at 7 days' age in comparison to the birth day (p values less than 0.006 and 0.001, respectively). Results also showed that serum thyroxin level of group 2 offspring lambs on the day 0 was significantly less than that in group 1 (p=0.003). It was concluded that the physiological function of selenium nanoparticles was dose dependent, and the 0.05 mg/kg B.W. dosage of Se NPs induced similar effects like 0.1 mg/Kg B.W. of sodium selenite, which resulted in increasing serum level of thyroxin at the day of birth. Conflict of interest: None declared. Manuscript profile -
Open Access Article
27 - The effects of zinc oxide nanoparticles on sterilization, establishment, and proliferation of lemon balm (Melissa officinalis L.)
Ehsan Soraya Gholamreza Gohari Alireza Motallebi Azar Saeedeh Alizadeh SaletehPlant tissue culture is one of the most important techniques for the production of secondary metabolites. Plant cells are an important and appropriate source for the production of various valuable secondary metabolites. Melissa officinalis L. is an important medicinal p MorePlant tissue culture is one of the most important techniques for the production of secondary metabolites. Plant cells are an important and appropriate source for the production of various valuable secondary metabolites. Melissa officinalis L. is an important medicinal plant with applications in treatment and alleviation of heart, nervous system, and gastrointestinal diseases, and particularly in memory enhancement and Alzheimer. This study investigated the effect of various concentrations of zinc oxide nanoparticles (0, 50, 100, 150, and 200 mg l-1) on disinfection stages, establishment, and proliferation of the lemon balm. Also, in order to study the effects of zinc oxide nanoparticles on establishment and proliferation of the lemon balm, explants were cultivated in murashige and skoog media containing zinc oxide nanoparticles at four different concentrations (0, 25, 50 and 75 mg L-1). Results showed that application of 200 mg l-1 zinc oxide nanoparticles significantly reduced fungal and bacterial infections and the number of healthy plantlets was more compared to the other treatments. Also, the second experiment showed that with an increase in the concentration of zinc oxide nanoparticles, the growth and proliferation decreased. Among different concentrations of zinc oxide nanoparticles, 25 mg L-1 had the maximum effect with significant increase in chlorophyll content while 25 and 50 mg L-1 zinc oxide nanoparticle concentrations had the maximum effect on increasing carotenoid contents. According to the findings,خطای ترجمه application of zinc oxide nanoparticles at low concentration (25 mg L-1) improved water and mineral uptake and eventually resulted in an improved growth and proliferation of Melissa officinalis L. plants Manuscript profile -
Open Access Article
28 - The effect of putrescine and calcium nanoparticle on photosynthetic pigments and antioxidant enzymes activities in stevia (Stevia rebaudiana Bertoni) under salt stress
Seyedeh Fatemeh Ghaderi kolayi Mahyar Gerami Masoud Azadbakht Parastoo MajidianThe objective of this study was to evaluate the effect of different concentrations of calcium nanoparticle and putrescine on some physiological traits of the medicinal plant, stevia, under salt stress. In this regard, the experiment was performed based on a factorial co MoreThe objective of this study was to evaluate the effect of different concentrations of calcium nanoparticle and putrescine on some physiological traits of the medicinal plant, stevia, under salt stress. In this regard, the experiment was performed based on a factorial completely randomized design with three replications. The experimental treatments contained three levels of calcium nanoparticle (0, 75, and 150 ppm), two levels of putrescine (0 and 1 mM), and three levels of salt (0, 75, 150 mM). Based on analysis of variance results, the simple effect of each treatment as salt stress, calcium nanoparticle, and putrescine was significant at P≤0.05; however, their interaction effect was not significant. Results also showed that salt stress (150 mM) resulted in the reduction of chlorophyll a (0.21), chlorophyll b (0.47), and total chlorophyll (0.68 mg/g dry weight) compared to the control while, an increase in carotenoid content (0.10) was observed under 150 mM salinity. Also, the photosynthetic pigments content increased under 150 ppm calcium nanoparticle and 1 mM of putrescine. Considering antioxidant enzymes, the treatment with 150 mM salt increased catalase enzyme as 1.69 and as 5.02 g/wet weight. In addition, the effect of putrescine led to the increase of catalase and peroxidase by 2.18 and 4.46 g/wet weight of leaves, respectively. Moreover, the treatment with 150 ppm calcium nanoparticles resulted in increases in catalase and peroxidase contents by 1.87 and 4.84 g/wet weight of leaves, respectively. The most appropriate concentrations of putrescine and calcium nanoparticles were 1 mM and 150 ppm, respectively which are recommended for assessment of other physiological and biochemical properties of stevia. Manuscript profile -
Open Access Article
29 - Phytochemical, antioxidant and phenolic content Survey of leaves and flowers hydroalcoholic extracts of the Conocarpus erectus and biosynthesis of gold and silver nanoparticles using this extracts
FATEMEH gORJIAN roya mirza jani maryam kolahiThe identification of various bioactive compounds, high phenolic content and high antioxidant activity in extracts of Conocarpus erectus reveals the potential application of this plant as a natural source of antioxidant with the capability of synthesizing nanoparticles MoreThe identification of various bioactive compounds, high phenolic content and high antioxidant activity in extracts of Conocarpus erectus reveals the potential application of this plant as a natural source of antioxidant with the capability of synthesizing nanoparticles for medicine. The aim of this study was to examine the phytochemical compounds in the leaves and flowers of Conocarpus erectus L. and to determine the phenolic content and antioxidant properties of these extracts. Conocarpus erectus L leaves and flowers were extracted utilizing the Soxhlet and Maceration extraction methods. Phytochemical compounds present in plant extracts were analyzed by the use of gas chromatography mass spectrometry. The amount of phenolic content and antioxidant activity in leaf and flower extracts were determined, and the gold and silver nanoparticles were synthesized using these extracts. Additionally the diameter of gold and silver nanoparticles synthesized using extracts of the leaves and flowers were measured. 19 chemical compounds were identified that were mainly in methanolic extracts of leaves prepared by Soxhlet extraction. Steroids were detected in both extracts The amount of phenolic compounds was high. In this study, the extract of flower obtained by Soxhlet method had the highest phenolic compounds. Of the plant extracts evaluated, the extracts obtained by the Soxhlet method had the lowest IC50 and thus the highest antioxidant capacity. Extracts were also utilized in the preparation of nanoparticles of gold and silver. Manuscript profile -
Open Access Article
30 - The Acute Toxicity of tin dioxide Nanoparticles on Chlorella vulgaris Algae
Fatemeh Shariati Mahrooz Ziksari Zohreh RamzanpourNowadays, nanotechnology and the use of its components, including nanoparticles, have successfully improved the situation of industries in advancing production goals. Among these nanoparticles, SnO2 or tin dioxide nanoparticles, which was used in this study, can be ment MoreNowadays, nanotechnology and the use of its components, including nanoparticles, have successfully improved the situation of industries in advancing production goals. Among these nanoparticles, SnO2 or tin dioxide nanoparticles, which was used in this study, can be mentioned. Tin dioxide is used in the manufacture of batteries and fuel cells, capacitors, and catalysts, and the health of living organisms will be affected by the negative effects of factory effluents entering rivers and other water sources. In this study, the biotoxicity of tin oxide nanoparticles on Chlorella vulgaris algae, which is one of the primary producers and most important levels of the food chain was investigated. This research was conducted by the OECD acute toxicity test method (Counting method for algae, method 201) and statistical probit analysis was performed to obtain toxicity data using the probit method. The results of exposure for Chlorella vulgaris in 48 and 72 hours, were EC50 and EC90 equal to 6.99, 57.54 and 13.08, and 1.07 x 1010 mg L-1, respectively. The highest growth decrease after 48 and 72 hours was observed in 5.5 mg L-1 SnO2 NP. During the test period, no morphological changes were observed for any of the microorganisms, which are based on the toxicity of tin oxide nanoparticles. Manuscript profile -
Open Access Article
31 - Evaluate the inhibitory activity of ZnO nanoparticles against standard strains and isolates of Staphylococcus aureus and Escherichia coli isolated from food samples
alireaz masiha maryam baradaran khosro isazadehThe antibacterial effect of different concentrations of zinc oxide nanoparticles on standard and isolated S. aureus and E. coli from food were studied. In this experimental study, suspension has been prepared from commercial ZnO nanoparticles in broth medium. After prep MoreThe antibacterial effect of different concentrations of zinc oxide nanoparticles on standard and isolated S. aureus and E. coli from food were studied. In this experimental study, suspension has been prepared from commercial ZnO nanoparticles in broth medium. After preparing standard strain and the strain were isolated from food samples, the effect of 1 and 2 times of Minimum Inhibitory Concentration (MIC) and also MBC test for ZnO nanoparticles on bacteria in different time were analyzed. According to the results obtained in this study, the maximum diameter of growth inhibition related to the concentration in5000 μg/ml zinc oxide nanoparticles for standard and isolated strain of E. coli. The average diameter of growth inhibition of standard strain of E. coli PTCC1399 and S. aureus PTCC11189 respectively were17.4 and 20.5 mm. The average diameter of the growth of E. coli and S. aureus isolated from foods respectively were 18.4 and 15.4 mm. A comparison of average MIC and MBC ZnO nanoparticles on the bacteria strains by Duncan test (p˂0.005) showed that the MBC is higher than the MIC in whole position bacteria. A ZnO nanoparticle among bacteria has most inhibition onS.aureu and for E. coli ST showed least impact. Results showed that mean comparison testis significantly different. Among times, zero time has the highest OD and the lowest OD was obtained in 240 second. This study showed that zinc oxide nanoparticles can be used to inhibit mentioned bacteria and can be a potential for alternative preservatives to prevent food spoilage possess. Manuscript profile -
Open Access Article
32 - Studying the antifungal effects of graphene nanoparticles on Aspergillus niger and Penicillium citrinum
Nader Habibi Maryam Aliasghari Asad RokhzadiThis study was conducted to study the antifungal effects of graphene nanoparticles on Aspergillus niger and Penicillium citrinum. Different concentrations of graphene nanoparticles were investigated to determine the minimum inhibitory concentration (MIC), the minimum fu MoreThis study was conducted to study the antifungal effects of graphene nanoparticles on Aspergillus niger and Penicillium citrinum. Different concentrations of graphene nanoparticles were investigated to determine the minimum inhibitory concentration (MIC), the minimum fungicidal concentration (MFC) and inhibition zone diameter. The results showed that the concentration of graphene nanoparticle which inhibited the growth of Penicillium mold was statistically more than that of Aspergillus niger. On the other hand, there was no difference between the concentrations of MFC for these two fungi. The MIC results for Aspergillus niger and Penicillium citrinum were 10388.9 and 10527.8 μg/ml respectively. Evaluation of the growth inhibition zone showed that up to 10500 ppm, there was no difference between the inhibition zones diameter of two microorganisms. However, with an increase in the concentration of graphene nanoparticle, the difference between the zone diameters in the two molds increased, so that the diameter of the inhibition zone of Aspergillus niger in higher nanoparticle concentrations was more than that of Penicillin citrinum. According to the results of this study it can be concluded that the effect of graphene nanoparticles on Aspergillus niger was higher than that of Penicillin citrinum. Manuscript profile -
Open Access Article
33 - Evaluation of pigments content and functional traits of Camelina (Camelina sativa) under the influence of growth stimulants
Najmeh Rezaiean Mahyar Gerami Parastoo Majidian Hamidreza GhorbaniThis research was conducted in order to investigate the effect of iron nanoparticle (INp) and Putrescine (Pu) on some Camelina traits as a factorial design in a randomized complete block design with three replications at Baye-Kola Agricultural Research Station (BARS) in MoreThis research was conducted in order to investigate the effect of iron nanoparticle (INp) and Putrescine (Pu) on some Camelina traits as a factorial design in a randomized complete block design with three replications at Baye-Kola Agricultural Research Station (BARS) in 2021. The treatments included INp (0, 20, 40 and 60 ppm) and putrescine (0, 0.5, 1 and 1.5 mM). Variance analysis showed that the factors were significant on the amount of photosynthetic pigments and morphological traits. The results of the comparison of the simple effect of the treatments showed that the highest amount of chlorophyll a and carotenoid was in the vegetative stage and carotenoid in the reproductive stage at 60 ppm of INp and the highest amount of chlorophyll a at 1 mM Pu and the highest am ount of carotenoid at 1.5 mM Pu. The highest amounts of chlorophyll b and total pigments were observed in the vegetative stage in the treatment combination of 40 ppm INp with 1.5 mM Pu and in the reproductive stage in the treatment combination of 60 ppm INp with 1 mM Pu. The highest amount of yield, number of seeds per capsule and also, the high value of 1000 seed weight and plant height were observed in the treatment combination of 40 ppm INp with 1 mM Pu. In general, the interaction effect of 60 ppm of INp and different concentration of Pu had the best results, and the spraying of these stimulants can improve the yield of the Camelina plant. Manuscript profile -
Open Access Article
34 - Ultra trace determination of Ranitidine in drinking water, tablet, serum (blood) , and human urine by a colorimetric method based on the aggregation of gold nanoparticles
maryam moradi mahmoodreza sohrabi saeed mortazavi nikAbstract: This research introduces a simple, sensitive, and rapid ultraviolet- visible spectrophotometry method for determination of ultra-trace amount of Ranitidine (RAN) in several sample such as drinking water, tablet, serum (blood), and human urine using gold nan MoreAbstract: This research introduces a simple, sensitive, and rapid ultraviolet- visible spectrophotometry method for determination of ultra-trace amount of Ranitidine (RAN) in several sample such as drinking water, tablet, serum (blood), and human urine using gold nanoparticles (AuNPs). The surface plasmon resonance (SPR) property of AuNPs and the interaction between RAN and AuNPs is the base of this method. The addition of RAN into AuNPs led to the aggregation of AuNPs. Transmission electron microscopy (TEM) proved aggregation of AuNPs in the presence of RAN. Also, the size of the nanoparticles distribution was evaluated by dynamic light scattering (DLS). The parameters that affect the absorbance such as pH, type and volume of buffer, AuNPs concentration, interaction time, ionic strength, and interfering ions were investigated and optimized. Linear range was obtained 25-300 μgL-1 in the optimum conditions. Also, the correlation coefficient (R2 =0.9955) and the limit of detection (LOD), and limit of quantification (LOQ) were equal to 1.45 μgL-1, and 1.63 μgL-1, respectively. In addition, the effect of interfering species was investigated. Eventually, the results showed that the proposed method had a high potential for rapid, sensitive, and accurate determination of RAN Manuscript profile -
Open Access Article
35 - سنتز و شناسایی نانوذرات وانادیم اکساید بهینه شده با نقره و بررسی اثر ضد باکتری آن بر اشرشیاکلی و استافیلوکوکوس اورئوس
مرجان حاجی محمد جوادی حمید رضا آقا بزرگ هدی پاسدار -
Open Access Article
36 - Using of steel slag and waste rusted iron shavings for biosynthesis of nano zero-valent iron nanoparticles with magnetite coating
Saber Moosazadeh shahab shariaty Mohammad Yousefi Sahar Baniyaghoob Hassan KefayatiIn the present study, iron ions were prepared by chemical digestion from waste rusted iron shavings and steel slag. The zero-valent iron nanoparticles (nZVI) were synthesized by reduction of iron ions from steel scrap and steel slag with Camellia sinensis extract (tea) MoreIn the present study, iron ions were prepared by chemical digestion from waste rusted iron shavings and steel slag. The zero-valent iron nanoparticles (nZVI) were synthesized by reduction of iron ions from steel scrap and steel slag with Camellia sinensis extract (tea) and coated by magnetite (Fe3O4). For this purpose, the leaf extract of Camellia sinensis was extracted using microwave waves as an environmentally friendly method and used as a reducing agent for the synthesis of nZVI. Then, the magnetite coating was placed on the zero-valent iron core to create a magnetic property. The properties and morphology of synthetic magnetic nanoparticles were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). The specific surface area and magnetic property of the nanoparticles were determined by adsorption and desorption isotherms (BET) and vibrating sample magnetometry (VSM) as 3.59 m2 g-1 and 6.5 emu g-1, respectively. The results confirmed the formation of magnetite on the core of zero-valent iron nanoparticles and the average diameter of synthetic particles was estimated to be about 20 nm. Using waste and slag sources and using plant extract as a reducing agent lead the proposed method to be considered as a green and economical method for synthesizing the core-shell nanostructure of zero-valent iron nanoparticles with magnetite coating. Manuscript profile -
Open Access Article
37 - Preparation of heterogeneous magnetic nanocatalysts based on reduced graphene oxide with nickel and cobalt particles and investigation of its activity in Heck and sonogashira cross-coupling reactions and 4-nitrophenol reduction
abdolreza abri forough matloubiToday catalysts are widely used in the production of various materials. Nano-catalysts according to their importance have become one of the most important areas for Nanotechnology research. Development of magnetic catalysts for carbon–carbon and carbon–heter MoreToday catalysts are widely used in the production of various materials. Nano-catalysts according to their importance have become one of the most important areas for Nanotechnology research. Development of magnetic catalysts for carbon–carbon and carbon–heteroatom coupling reactions are one of the most important issues in terms of applications to organic synthesis. At present, many researches are focused on the construction of more active and more stable, heterogeneous Nano-sized metal catalysts, which can be recovered and reused. Nickel and cobalt nanoparticles due to low prices, magnetic properties and high chemical activity attracted particular attention. In this work, nickel and cobalt nanoparticles were synthesized with a green and one-pot method on graphene oxide substrate for reduction reaction of 4-nitrophenol, Heck and Sonogashira cross-coupling reactions. Several characterization techniques such as FTIR, FESEM, XRD, and VSM were employed to characterize the Co and Ni nanoparticle reduced graphene oxide composites witch indicates that nickel and cobalt magnetic particles with a size of about 20-30 nanometers were uniformly anchored on graphene oxide nanosheets. In addition, results showed that incorporation of Co and Ni nanoparticles and GO produce much higher activity in cross-coupling and reduction reactions. The soft-ferromagnetic behavior of the RGO/CoxNi100-x nanocomposite demonstrated the easy separable from the reaction mixture and reusable several times without losing its catalytic activity, Hence, the RGO/CoxNi100-x composites can be a potential promising material to catalyze the cross-coupling reactions Manuscript profile -
Open Access Article
38 - Biosynthesis of iron oxide nanoparticles using aqueous extract of Opuntia Cactus and its application in the synthesis of pyrimidine derivatives
Maryam Jahandar Lashaki Rahimeh Hajinasiri Zinatossadat Hossaini Navabeh NamiIn recent years, the green method, especially using plant extracts, has attracted much attention for synthesis of metal nanoparticles. In this study, biosynthesis of magnetic iron oxide nanoparticles (Fe­3O4-NPs) was performed using an aqueous extract of Opuntia Cac MoreIn recent years, the green method, especially using plant extracts, has attracted much attention for synthesis of metal nanoparticles. In this study, biosynthesis of magnetic iron oxide nanoparticles (Fe­3O4-NPs) was performed using an aqueous extract of Opuntia Cactus. Plant extract had a reducing and stabilizing role in the nanoparticle synthesis process. The structure and morphology of synthesized Fe­3O4-NPs were confirmed with X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared Fourier transform spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), and vibrating sample magnetometry (VSM). The obtained results showed that the proposed method presented a synthesis of magnetic Fe3O4-NPs with a spherical shape and average size of 9.7 nm. Also, pyrimidine derivatives were synthesized by a one-pot three-component reaction between aromatic aldehydes, acetoacetanilide and urea or thiourea in the presence of prepared magnetic Fe­3O4-NPs as a catalyst in ethanol at room temperature. Short reaction time, easy purification steps, and high efficiency are the advantages of this method. Manuscript profile -
Open Access Article
39 - The Study of the effect of nanographene and nanographene oxide on physical and mechanical properties of natural rubber nanocomposites
Bagher Mohammadi Fahimeh NoriIn this work, natural rubber (latex) nanocomposites were prepared by adding reduced graphene oxide and graphene oxide nanoparticles to the pristine latex. Then some physical and mechanical properties of these nanocomposites were investigated. These properties included t MoreIn this work, natural rubber (latex) nanocomposites were prepared by adding reduced graphene oxide and graphene oxide nanoparticles to the pristine latex. Then some physical and mechanical properties of these nanocomposites were investigated. These properties included tensile strength at peak point, tensile strength at breaking point, tensile percentage, surface cohesion, and rheometry. The experimental results of these nanocomposites were compared with those of natural rubber. The results showed that nanocomposites containing graphene oxide were much more desirable in terms of physical and mechanical properties than nanocomposites containing reduced graphene oxide. Both of these nanocomposites had better results in terms of physical and mechanical properties than pristine natural rubber. The FESEM images showed that the surface of samples which containing nanographene, had better uniformity and adhesion than those of the original latex. The surface adhesion of nanocomposites, containing nanographene oxide was much better and more desirable comparing to the others. Manuscript profile -
Open Access Article
40 - Investigation of thermophysical properties and rheology of iron-silver-copper metal oxide hybrid nanoparticles based on carbon structure of quantum dots for use in heat transfer systems with turbulent flow regime
Hamid Mousavi , Seyed Mostafa Tabatabaee Ghomshe Alimorad rashidi Masoumeh MirzaeiIn this work, nano-hybrids of iron-carbon quantum dots, silver-carbon quantum dots, and copper– carbon quantum dots were synthesized and prepared by a wet chemical method. After examining their thermal and thermophysical properties, the thermal conductivity (k) wa MoreIn this work, nano-hybrids of iron-carbon quantum dots, silver-carbon quantum dots, and copper– carbon quantum dots were synthesized and prepared by a wet chemical method. After examining their thermal and thermophysical properties, the thermal conductivity (k) was measured and the heat transfer coefficient (h) for turbulent flow was compared. The synthesized samples were characterized with Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), tunneling electron microscopy (TEM), and scanning electron microscopy (SEM). Zeta, and dynamic light scattering (DLS) stability tests were also performed for the synthesized samples. The prepared carbon quantum dots and hybridized-iron, silver, and copper samples were distributed in the base fluid (water) by ultrasonic probe device. Viscosity and density were examined as a measure of nanoparticle concentration and temperature. Also, the heat capacity of synthesized nanoparticles was measured at different temperatures, but the changes in density and heat capacity at low concentrations of nanoparticles were not significant. Then the thermal conductivity (k) and the heat transfer coefficient (h) were measured to improve the heat transfer by the synthesized nanoparticles. The synthesized nanoparticles were prepared and analyzed for three different concentrations of 0.05, 0.1, and 0.5 wt. %. The greatest improvement in thermal conductivity 25 % at a concentration 0.5 wt. % and 45 °C was for hybridized copper nanoparticles-carbon quantum dots. Also, the highest improvement in heat transfer coefficient (h) was reported in Reynolds number 15529 for silver nanoparticles-carbon quantum dots improvement was about 29 %. In addition, copper nanoparticles-carbon quantum dots with a 20 % improvement in transfer heat transfer coefficient reported. Manuscript profile -
Open Access Article
41 - Preparation and evaluation of polyvinyl alcohol nanocomposite containing zinc oxide nanoparticles and montmorillonite
Negar Motakef Kazemi elaheh mollaakbari Raheleh HalabianThe purpose of this research is to investigate the mechanical, antibacterial, and cytotoxic properties of biocompatible polyvinyl alcohol (PVOH) nanocomposite modified with zinc oxide (ZnO) nanoparticles and montmorillonite (MMT) to prepare a film for use in food packag MoreThe purpose of this research is to investigate the mechanical, antibacterial, and cytotoxic properties of biocompatible polyvinyl alcohol (PVOH) nanocomposite modified with zinc oxide (ZnO) nanoparticles and montmorillonite (MMT) to prepare a film for use in food packaging. Zinc oxide nanoparticles were synthesized by hydrothermal method via chemical reduction process. This method was performed using zinc acetate salt as a metal precursor, soda as reductant and water as a solvent for 1 hour at a temperature of 80°C. The samples were characterized by X-ray diffraction (XRD) to evaluate the crystal structure, and field emission scanning electron microscope (FESEM) to check the size of the particles and morphology of the samples. The mechanical properties of the samples were investigated. The obtained results showed that the moisture content in the optimal film was reduced to 1.01 x 10-8 g/m3 and the tensile strength and Young's modulus were increased to 0.492 MPa and 24.1 Pa, respectively. The antibacterial activity against Escherichia coli was evaluated by the agar well method and the final nanocomposite showed the highest antibacterial property with the non-growth halo of 0.64 mm. Cytotoxicity of the samples was recorded using the MTT assay method on the HEK293 cell line after 1, 3, and 5 days. The highest percentage of normal cell viability was observed at the concentration of 0.25 mg/ml of the sample and the final nanocomposite showed the highest cell viability. Based on the obtained results, nanocomposite containing zinc oxide nanoparticles and montmorillonite can have a good potential for use in food packaging industries. Manuscript profile -
Open Access Article
42 - Synthesis, characterization, and evaluation of antibacterial activities of novel nanocomposite films chitosan/phosphorus triamide/Fe3O4 NPs
samad yarahmadi niloufar dorosti maryam pas abdul naser mohammadiIn this work, new nano-composite of chitosan/phosphorus triamide with Fe3O4 NPs (1, 2.5, 5%) was prepared. The Fe3O4 NPs were synthesized at size of about 18-24 nm with a spherical morphology through co-precipitation method by using FeCl3.9H2O and FeCl2.4H2O salts. The MoreIn this work, new nano-composite of chitosan/phosphorus triamide with Fe3O4 NPs (1, 2.5, 5%) was prepared. The Fe3O4 NPs were synthesized at size of about 18-24 nm with a spherical morphology through co-precipitation method by using FeCl3.9H2O and FeCl2.4H2O salts. The phosphorus triamide derivative was synthesized from the reaction of tert-butylamine with phosphoryl chloride. X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images of chitosan, phosphorus triamide, Fe3O4 NPs, chitosan/phosphorus triamide, and chitosan/phosphorus triamide/1-5% Fe3O4 NPs were investigated and the results confirmed the formation of the desired films. Further, morphology and the size of nanoparticles were investigated by changing ultrasonic frequency (37 and 80 Hz) and power (30, 60, and 100 W). The in vitro antibacterial activities were evaluated against two gram-positive Staphylococcus aureus (S. aureus), Bacillus cereus (B. cereus) and one gram-negative Pseudomonas aeruginosa (P. aeruginosa) bacteria. Nanocomposite containing higher percent of Fe3O4 NPs showed more antibacterial activities. Results also displayed greater antibacterial effects against B. cereus bacterium. Manuscript profile -
Open Access Article
43 - Application of Nano Hydrogels In Improving The Performance Of Wound Dressings and Drug Delivery: A Review Study
MohammadHossein Karami Majid Abdouss MohammadReza Kalaee Omid MoradiOne of the most common clinical diseases is skin scarring, which is defined as damage to the structure or integrity of skin tissue. Nanohydrogel can help in sustained release of drug by entrapping drug or loading drugs and thus promote wound healing. A hydrogel is a thr MoreOne of the most common clinical diseases is skin scarring, which is defined as damage to the structure or integrity of skin tissue. Nanohydrogel can help in sustained release of drug by entrapping drug or loading drugs and thus promote wound healing. A hydrogel is a three-dimensional hydrophilic network that is insoluble in water or aqueous solutions and is able to absorb water or other biological fluids that can promote wound healing. Various nano hydrogels have been designed to improve the design of wound dressings, and nano hydrogels are also used in drug release. The advantage of hydrogels over traditional wound dressings is their ability to improve the wound and the wound healing process. Hydrogels meet most criteria for modern wound dressings due to their unique properties. Among the unique properties of nano-hydrogels, we can mention the ability to absorb wound secretions, maintain a moist environment, gas exchange, remove the dressing from the wound surface without pain and replace the dressing for the patient, ease of movement for surgery. In this research, an overview of the use of nano-hydrogels in improving the performance of wound dressings and drug delivery, along with the investigation of antibacterial properties, introduction of commercial wound dressings and wound healing mechanisms, has been discussed. Manuscript profile -
Open Access Article
44 - Optimization of operating conditions and the role of ultrasound waves in the green synthesis of silver nanoparticles using apple tree leaf extract
Sarvin Mohammadi-Aghdam Omid AhmadiApple tree leaf extract is one of the effective materials in the synthesis of AgNPs, the results of FTIR spectroscopy showed the presence of several reducing agents. AgNPs were synthesized by mixing 2 ml of extract with 8 ml of AgNO3 solution based on the design of the MoreApple tree leaf extract is one of the effective materials in the synthesis of AgNPs, the results of FTIR spectroscopy showed the presence of several reducing agents. AgNPs were synthesized by mixing 2 ml of extract with 8 ml of AgNO3 solution based on the design of the experiment by surface response methodology in the heating temperature range of 30-70 °C and ultrasound time of 5-25 min. After the optimization, the results showed that the temperature of 52 °C and the duration of 15 min was the most suitable mode for the synthesis of AgNPs, in which the highest concentration was 27.10 ppm, the lowest average particle size was 66 nm, and the highest antioxidant property was 31.48. %. The results of UV-Vis spectroscopy and DLS analysis were confirmed at the optimum point with a slight difference, and the PDI and zeta potential were obtained as 0.397 and 21.2 mV, respectively. AgNPs showed good antibacterial properties against Staphylococcus aureus and Escherichia coli with halo diameters of 56 and 48 mm, respectively. The antifungal property of nanoparticles was 72%. Manuscript profile -
Open Access Article
45 - Targeted delivery of Elesclomol to colorectal cancer using a drug delivery system based on magnetic mesoporous silica nanoparticles
Mojtaba Tarin Maryam Babaei Hossein Eshghi Maryam Matin Amir Shokooh SaljooghiIn this research, the targeted delivery of elesclomol to colorectal cancer cells was explored through the development of magnetic mesoporous silica nanoparticles (MMSNs) loaded with elesclomol and surface modification with gold gatekeepers, bifunctional polyethylene gly MoreIn this research, the targeted delivery of elesclomol to colorectal cancer cells was explored through the development of magnetic mesoporous silica nanoparticles (MMSNs) loaded with elesclomol and surface modification with gold gatekeepers, bifunctional polyethylene glycol (PEG) polymer, and epithelial cell adhesion molecule (EpCAM) aptamers to improve drug delivery performance. The physicochemical properties of nanocarriers were characterized and the cellular toxicity of elesclomol, and nano-delivery system with and without EpCAM aptamer modification has been investigated in vitro. High resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscopy (FESEM) showed that MMSNs had a uniform spherical morphology with a diameter of 19 nm and a negative surface charge. Elesclomol was successfully encapsulated in the open porous structure of the nanocarrier. The encapsulation efficiency (EE) and drug loading capacity (LC) were about 88% and 39%, respectively. Moreover, the prepared Au-ELC-MMSN-NH2 displayed pH responsive and sustained drug release within 96 h. Targeted nano-delivery systems were prepared with a final diameter of 89 nm and a negative surface charge. The MTT assay revealed that the targeted nano-delivery system induced highly effective cytotoxicity on colorectal cancer cells-expressing EpCAM aptamer (HT-29) compared to the CHO cells. This engineered nano-platform is a promising elesclomol replacement therapy for colorectal cancer. However, further experiments are required before it can be practiced in the clinic. Manuscript profile -
Open Access Article
46 - Removal of some textile cationic dyes from industrial wastewater using modified gamma alumina nanoparticles
Masoud Saadati Mortaza Iranifam Seyyed Iman MosaviThe present study deals with the removal of two cationic dyes from aqueos solutions by surfactant-modified gamma alumina nanoparticles. The nanoparticles were synthesized by sol-gel method and after modifying with sodium dodecyl sulfate (SDS), an anionic surfactant, had MoreThe present study deals with the removal of two cationic dyes from aqueos solutions by surfactant-modified gamma alumina nanoparticles. The nanoparticles were synthesized by sol-gel method and after modifying with sodium dodecyl sulfate (SDS), an anionic surfactant, had been successfully performed to remove basic brown 1 (BB1) and basic red 46 (BR46) from textile industrial effluents. The SEM images, FTIR spectra, and XRD patterns showed a successful synthesis of the nanoparticles followed by surface modification. The relationships between different condition factors (contact time, concentration of dyes, amount of adsorbent, and pH) were investigated by response surface methodology (RSM). The optimal conditions were determined to be a contact time of 15 minutes, pH of 6, initial concentrations of 27.5 mg/l and 41.6 mg/l for BB1 and BR46, respectively; and adsorbent doses of 0.030g and 0.035 g for BB1and BR46, respectively. The effect of other parameters including temperature and interfering species on the removal of dyes were also investigated and the dye removal obtained under optimal conditions were 93.12% for BB1 and 97.34% for BR46. The obtained results showed that the removal of dye with modified nanoparticles was better than unmodified nanoparticles. Manuscript profile -
Open Access Article
47 - Electrocatalytic activity of Pt/C nanocatalyst stabilized by different amounts of sodium citrate in oxygen reduction reaction
Kulthum Mehrabinejad Mehdi KheirmandIn the present study, Pt(20wt%)/C electrocatalysts for oxygen reduction reaction in the cathode of fuel cells were synthesized with different amounts of trisodium citrate as stabilizing agent, to achieve higher efficiency of platinum electrocatalyst. The electrocatalyst MoreIn the present study, Pt(20wt%)/C electrocatalysts for oxygen reduction reaction in the cathode of fuel cells were synthesized with different amounts of trisodium citrate as stabilizing agent, to achieve higher efficiency of platinum electrocatalyst. The electrocatalysts containing platinum and trisodium citrate with ratios of 1:12, 1:9, 1:6, and 1:3 (Pt/C:TC) were prepared by using the saturation-reduction method. To evaluate the oxygen reduction reaction in the cathode catalyst layer in an acidic environment cyclic voltammetry (CV), linear sweep voltammetry (LSV), rotating disk electrode (RDE), and finally electrochemical impedance spectroscopy (EIS) techniques were applied. Also, morphology of the catalysts was studied with scanning electron microscopy (SEM). The results showed that the efficiency of the synthesized electrocatalysts at a ratio of 1:3 (Pt/C:TC) was better for oxygen reduction. It also had lower charge transfer resistance, more suitable distribution, and higher electrochemically active surface area (14.7 m2gPt). In addition, the number of electrons involved in the oxygen reduction reaction was calculated to follow the four-electron pathway for the electrocatalyst prepared at ratio of 1:3. Manuscript profile -
Open Access Article
48 - Continuous and controlled production of dexamethasone nanoparticles in a microfluidic system
payam zahedi maryam tabatabai morteza fathi pour amin sohrabiThe aim of this work is to produce continuously dexamethasone nanoparticles (DEX NPs) in a microfluidic (MF) system via nanoprecipitation method to control particle size, possessing their physical structure, and enhancing the efficiency of this hydrophobic drug in physi MoreThe aim of this work is to produce continuously dexamethasone nanoparticles (DEX NPs) in a microfluidic (MF) system via nanoprecipitation method to control particle size, possessing their physical structure, and enhancing the efficiency of this hydrophobic drug in physiological environments. In order to fabricate a MF chip, a series of microchannels with dimensions 1 cm in length, 200 μm in width, and 50 μm in depth are embedded using ultraviolet soft lithography on a sheet based on polydimethylsiloxane (PDMS), and then the laminar fluid flow ability is investigated through it. The effective factors on the optimized production of the drug NPs are determined by the design of experiment. In this line, the optimum values for drug solution concentration, surfactant concentration, drug solution flow rate, and non-solvent flow rate are 15 mg/ml, 1 mg/ml, 4.5 ml/h, and 8 ml/h, respectively. By adjusting these values the average sizes of DEX NPs are obtained 590 ± 20 nm based on the model and 500 ± 20 nm according to the experiments. In the following, the results of dynamic light scattering (DLS) test show the narrow size distribution of DEX NPs fabricated using the MF chip. Also, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) assays reveal that application of the MF system does not affect the crystallinity of the drug NPs and does not alter their structure after the process. Finally, MF-assisted DEX NPs sample shows the drug solubility rate of about 8-fold compared to the commercial powder ones Manuscript profile -
Open Access Article
49 - Study of biological effects and toxicity of mercury impregnated γ-alumina nanoparticles in Hella cancer cells and stem cells
nahid soheili arshadi amir abbas mokhariyeh mehdi zamani -
Open Access Article
50 - ساخت نانوذره‌های CuO در بستر موردنیت و بررسی ویژگی ضدباکتری آن
سمیرا کریمی افشین پوراحمد لیلا اسدپور -
Open Access Article
51 - Effects of adding silver nanoparticles on thermal conductivity and viscosity of poly-alpha-olefin fluid
حمیدرضا قربانی سید کمیل حسینی اسفندانیIn this work, the silver nanoparticles effects on viscosity and thermal conductivity of silver-poly alpha olefin nanofluid were studied. Silver nanoparticles in different sizes and with various concentrations spread over the base fluid of poly alpha olefin and thermal c MoreIn this work, the silver nanoparticles effects on viscosity and thermal conductivity of silver-poly alpha olefin nanofluid were studied. Silver nanoparticles in different sizes and with various concentrations spread over the base fluid of poly alpha olefin and thermal conductivity were studied. Also, thermal conductivity was measured at different temperature conditions. In addition, the impact of nanoparticles on the viscosity of the fluid was measured at different concentrations. The thermal conductivity and viscosity of nanofluids increase with increasing volumetric concentration of silver nanoparticles. In addition, the thermal conductivity of nanofluid increases and the viscosity of nanofluid decreases with increasing temperature. Also, the thermal conductivity decreases with increasing nanoparticles size. Manuscript profile -
Open Access Article
52 - Methylene blue removal in a batch reactor using synthesized CdO nanoparticles
Kasra Behzad Parisa Attarzade Afarin BahramiIn the present research, CdO nanoparticles were synthesized using the chemical reduction method at six different temperatures. Due to have different calcination temperature, the nanoparticle were synthesized in different sizes. Structural and optical properties of nanop MoreIn the present research, CdO nanoparticles were synthesized using the chemical reduction method at six different temperatures. Due to have different calcination temperature, the nanoparticle were synthesized in different sizes. Structural and optical properties of nanoparticles were characterized using XRD and UV-Vis spectroscopy. Based on the results, the CdO nanoparticles have cubic structure with the particles size of 27 – 60 nanometer. To investigate the photocatalytic properties of CdO nanoparticles, dye degradation effect in the presence of CdO nanoparticles and UV beam was study in a batch reactor as a function of time at three different pH values. Studies have shown that the optical absorption was decrease as a function of time. The photocatalytic reaction revealed that the dye degradation in methylene blue was speeded up with increasing the pH value. Manuscript profile -
Open Access Article
53 - Synthesis and characterization of polyindole/silver nanoparticles nanocomposite and its application in the design of electrochemical sensor L-Cysteine
خدیجه قنبری زهرا بابایی سپیده بنیادیIn this study, an effective electrochemical sensor for the rapid measurement of L-cysteine based on glassy carbon electrode modified with polyindole/silver nanoparticles nanocomposite is presented. Polyindole nanofibers were synthesized by cyclic voltammetry method at t MoreIn this study, an effective electrochemical sensor for the rapid measurement of L-cysteine based on glassy carbon electrode modified with polyindole/silver nanoparticles nanocomposite is presented. Polyindole nanofibers were synthesized by cyclic voltammetry method at the glassy carbon electrode surface, and then silver nanoparticles were deposited on these nanofibers using a constant potential method. Surface morphology and characterization of the modified electrodes were confirmed by field emission scanning microscopy (FE-SEM), X-ray diffraction (XRD), Raman, and FT-IR spectroscopies. The electrochemical investigation showed that the polyindole/silver nanoparticles had very good efficiency with respect to the electrocatalytic oxidation of L-cysteine in phosphate buffer solution (pH = 7.0). The response of the glassy carbon electrode/polyindole/silver nanoparticles to L-cysteine was linear in the concentration range of 0.01-10 mM. The detection limit was obtained at signal/noise=3, 5.7 μM. In addition, the sensor showed good stability and repeatability. The application of the proposed sensor for the analysis of L-cysteine in human serum was successful. Manuscript profile -
Open Access Article
54 - تهیه و مطالعه نانوذرات پلی‌آکریل‌آمید حکاکی شده برای تشخیص گلوکز در محیط آبی
زهرا حسینی مینا کشوردوست فریده پیری -
Open Access Article
55 - Green synthesis of Ag nanoparticles on the calcite support using Salix aegyptiaca leaf extract and its catalytic activity investigation in removal of dyes
akbar Rostami leila rostamiIn this work, Ag nanoparticles (Ag NPs) were immobilized on the surface of mineral calcite (CaCO3) using leaf extract of pussy willow (Salix aegyptiaca) as reducing and stabilizing agent. Conversion of Ag+ to Ag NPs was carried out within a few minutes at room temperatu MoreIn this work, Ag nanoparticles (Ag NPs) were immobilized on the surface of mineral calcite (CaCO3) using leaf extract of pussy willow (Salix aegyptiaca) as reducing and stabilizing agent. Conversion of Ag+ to Ag NPs was carried out within a few minutes at room temperature. The calcite and its Ag nanocomposite (Ag NPs/Calcite) were characterized by fourier transform infrared (FTIR), ultraviolet and visible spectroscopy (UV-Vis), X-ray powder diffraction (XRD) and field emission scanning electron microscope (FESEM) couplied with energy dispersive X-ray spectroscopy (EDS or EDX), and transmission electron microscopy (TEM) techniques. The broad peaks between 450-500 nm in the UV-Vis spectrum of silver nanoparticles and Ag NPs/Calcite is assigned to a surface plasmon absorption. According to the TEM image, the average size of the Ag NPs on the surface of calcite surface was 11 nm. The Ag NPs/Calcite nanocomposite was used in the catalytic reduction reaction of methyl orange (MO), methylen blue (MB), and rhodamine B (RhB). The catalyst was reused three times without considerable loss in its activity. Manuscript profile -
Open Access Article
56 - Removal, pre-concentration and determination of palladium from different environmental water samples using modified magnetic nanoparticles prior to flame atomic absorption spectrometry
مریم حمیدی مجید رمضانیIn this study, a new sorbent based on dimethylglyoxim/sodium dodecyl sulfate - immobilized on TEOS-coated magnetic nanoparticles (Fe3O4@SiO2@SDS/DMG) was prepared as a simple, inexpensive, and fast method for pre-concentration and determination of trace amounts of palla MoreIn this study, a new sorbent based on dimethylglyoxim/sodium dodecyl sulfate - immobilized on TEOS-coated magnetic nanoparticles (Fe3O4@SiO2@SDS/DMG) was prepared as a simple, inexpensive, and fast method for pre-concentration and determination of trace amounts of palladium. In the proposed approach, the analytes retained on the sorbent are effectively eluted with thiourea– HCl solution and the absorbance of analyte was determined by flame atomic absorption spectrometry. The effects of different parameters on extraction efficiency such as effect of pH, extraction time, type and amount of eluent, and amount of absorbent phase were investigated and optimized by batch procedures. Under the optimum experimental conditions, the preconcentration factor, detection limit, linear range, and relative standard deviation (RSD) of palladium (II) ions were 250, 0.49 μgl-1, 125-3750μ gl-1, and 2.26 % (for 125μ gl-1, n=6), respectively. Finally, the method was successfully applied to the evaluation of Pd2+ in different environmental water samples. Manuscript profile -
Open Access Article
57 - تهیه و بررسی ویژگی‌های نانوذره‌های بسپار قالب مولکولی گزینش‌پذیر بر پایه پلی‌وینیل‌الکل برای حذف2،4- دی‌نیتروتولوئن
سید مهدی پور مرتضوی معصومه فروتن کودهی -
Open Access Article
58 - Investigation of magnetic properties and photocatalytic performance of Fe3O4 nano particles after coating with ZnO and TiO2
سولماز قنبرنژاد علی نعمتی سعید باغشاهی محبوبه محمودیIn this research, magnetite NPs via sol/gel method was coated with ZnO and TiO2. Phases, microstructures, and magnetic properties of binary and ternary core/shell nanoparticles were characterized using X-ray diffraction )XRD), transmission electron microscopy )TEM) and MoreIn this research, magnetite NPs via sol/gel method was coated with ZnO and TiO2. Phases, microstructures, and magnetic properties of binary and ternary core/shell nanoparticles were characterized using X-ray diffraction )XRD), transmission electron microscopy )TEM) and vibrational magnetometer )VSM). Photocatalytic activities in methylene blue degradation under sunlight irradiation for 120 min were recorded using UV/Vis spectrophotometer, changes were studied using the photoluminescence spectrum (PL), and the specific surface areas were obtained by the nitrogen adsorption/desorption apparatus )BET). The results showed that 10 mg/ml core/shell nanoparticles during 120 min under sunlight radiation could degrade >90% of methylene blue molecules. However, the increase in the number of shells causes the change in the type of semiconductors from direct to indirect; following that heterogeneous interface reduces the photocatalytic efficiency Manuscript profile -
Open Access Article
59 - Synthesis and characterization of magnetic graphene nano-adsorbent stabilized on polymer nylon 6 and its application for removal of lead (II) ions contaminant form aqueous solution
سید یدالله میر نظامی مهران دولو محمودرضا سهرابی مرتضی خسروی فرشته مطیعیIn this research, the magnetic graphene nanoparticle )GM( was synthesized and stabilized on nylon-6. The purpose of its synthesis is to remove lead ions )II( contaminant from the aqueous solution. The prepared nanocomposite was characterized using X-ray diffraction anal MoreIn this research, the magnetic graphene nanoparticle )GM( was synthesized and stabilized on nylon-6. The purpose of its synthesis is to remove lead ions )II( contaminant from the aqueous solution. The prepared nanocomposite was characterized using X-ray diffraction analysis )XRD(, scanning electron microscope )SEM(, Fourier transform infrared spectrometry )FT-IR(, and surface area determination )BET(. In order to optimize the removal of Pb)II( ions from the aqueous solution the graphene was converted from two-dimensional to three-dimensional structure by using nylon-6 as substract to increase the surface area of the graphene and consequently increase the adsorbent efficiency. Another advantage of the absorbent is its magnetic effect that allows adsorption of the contaminant and its easy separation by an external magnet. The influence of experimental parameters such as initial solution pH, contact time, adsorbent dosage, concentration of lead ions (II) solution, and solution temperature on the removal efficiency were investigated. At optimal conditions the removal efficiency of lead ions (II) achieved by adsorbent was 95%. Manuscript profile -
Open Access Article
60 - تهیه، شناسایی ساختار و ویژگی ضدباکتری نانوچندسازه‌های پلی(آنترانیلیک اسید)/نقره
حسین حسین زاده بهاره رضاپور -
Open Access Article
61 - Biosynthesis of copper nanoparticles by Stenotrophomonas maltophilia
Zahra Amirpoor Monir Doudi Gholam Reza AmiriBackground & Objectives: Heavy metals are environmentally sustainable and durable pollutants that have become a world problem. As microorganisms show high resistance to heavy metals and can purify the environment and produce nanoparticles, the present study was desi MoreBackground & Objectives: Heavy metals are environmentally sustainable and durable pollutants that have become a world problem. As microorganisms show high resistance to heavy metals and can purify the environment and produce nanoparticles, the present study was designed to produce copper nanoparticles from copper-resistant bacteria isolated from wastewater of two copper workshops in Isfahan. Materials & Methods: In this cross-sectional study, wastewater samples were collected from two copper workshops in Isfahan. The physicochemical factors of the wastewater, the minimum inhibitory concentration of bacteria (MIC) to copper and their resistance to several antibiotics were investigated. Morphological, biochemical and molecular identification tests were carried out on samples. Then the biomass of copper-resistant bacteria was added to the copper sulfate pentahydrate stock (CuSO4.5H2O) and the results were evaluated by Ultraviolet-Visible spectrophotometer (UV-VIS), X-ray diffraction (XRD) and Transient Electron Microscopy (TEM). Results: Among the studied bacteria, the Bacillus toyonensis strain NE2 with the MIC of 3.5 mM and Arthrobacteragilis NE1 with MIC of 4 mM from copper workshop 2 and Stenotrophomonas maltophilia strain 5633 with the MIC of 6 mM from copper workshop 1 were isolated. Among these isolates, only S. maltophilia strain 5633 was able to synthesize copper nanoparticles. Peaks created in the range of 250-430 nm confirmed the presence of Copper (Cu) and Copper Oxide (CuO) particles. Conclusion: The findings of this study showed that the isolated bacteria could be a good candidate to remove copper from wastewater and to biosynthesize copper nanoparticle. Manuscript profile -
Open Access Article
62 - The Effect of Silicon Carbide Ceramic Nanoparticles on the Tribological Properties of SN500HVI Paraffinic Base Oil
Meisam Makkarian Elham AmeriThe effect of silicon carbide (SiC) nanoparticles on the tribological properties of the base oil was investigated by friction and wear tests. SiC nanoparticles were synthesized by sol-gel method and added to the base oil at various weight percentages of (0.25, 0.5, 1 an MoreThe effect of silicon carbide (SiC) nanoparticles on the tribological properties of the base oil was investigated by friction and wear tests. SiC nanoparticles were synthesized by sol-gel method and added to the base oil at various weight percentages of (0.25, 0.5, 1 and 5). To increase the stability of SiC nanoparticles in the base oil, the surface was modified using oleic acid. To characterize the morphology of SiC nanoparticles, the FT-IR, FESEM and XRD techniques were applied. This investigation was carried out in the base oil SN500HVI from Sepahan Oil Company, Iran. The friction and wear tests were performed on the mixture of SN500HVI/nanoparticles. The tribological properties of nanoparticles in base oil were investigated using pin on disc test according to ASTM G99 test method. Based on the results obtained by XRD, the average size of SiC was known to be less than 30 nm. The mixture of nanoparticles in base oil with concentrations of 0.25, 0.5 and 1 wt.% led to reduction of friction coefficient by 26%, 15%, and 4%, in comparison to pure base oil, respectively. This tribological behavior was due to adhesiveness of nanoparticles on involving surfaces. Furthermore, the topography of worn surfaces was analyzed using FESEM. The results illustrated that the nanoparticles can be an effective additives to improve the quality of lubricants in terms of reducing the friction and wear due to their proper physical properties such as suitable hardness, spherical shape and high specific surface area. Manuscript profile -
Open Access Article
63 - Biochemical and Histopathological Study of the Toxicity of Zinc Oxide Nanoparticles on Liver in Rat
S.M Hosseini A.H Moshrefi رضا Amani S.V Razavimehr M.H AghajanikhahZinc oxide (ZnO) is one of the most widely used materials in diverse industrial fields, for this reason most widely produced and Have many technological applications. The human body may be intentionally or unintentionally exposed to these nanoparticles. In this study, a MoreZinc oxide (ZnO) is one of the most widely used materials in diverse industrial fields, for this reason most widely produced and Have many technological applications. The human body may be intentionally or unintentionally exposed to these nanoparticles. In this study, acute toxicity of zinc oxide nanoparticles on the liver enzymes and liver histopathology was evaluated. Fifty female rats with 180-220 grams of weight were divided into five groups, including control, Sham and Three groups with different doses of ZnO nanoparticle (25, 50 and 100 mg/kg twice a week for four weeks). The rats were then sacrificed and cholesterol, triglycerides, totalprotein, albumin and liver enzymes (ALT, AST and ALP) were determined and livers were fixed in formalin processed, sectioned and stained with Hematoxylin- Eosin. After removal of the tissue, samples digestion and zinc concentrations were measured by atomic absorption; Finally Data were analyzed using one way ANOVA. Also the most of the Zno nanoparticles absorption on the dose of 100 mg/kg was observed. Histopathological analysis of liver sections showed tissue damage, such as necrosis, congestion and vacuolar degeneration at a dose of 25 mg/ kg andin addition inflammatorycell infiltrationin doses 50 and 100 mg/kg was observed. In Serological studyalso increased serum ALT, AST and ALP Liver enzymes levels. Results of the present study showed the dose-dependent toxicity of ZnO nanoparticles on the liver; therefore exposure to nanoparticles can make serious risks in humans. Manuscript profile -
Open Access Article
64 - The Effect of Fe2O4Zn Nanoparticles on Kidney Tissue and Blood Biochemical Factors in Wistar Male Rats
D. Rahmani Z. Hooshmandi Ferdowsi Sh.Nanoparticles should be investigated under the laboratory conditions for using in treatment of diseases. This study aimed to investigate the effects of nanoparticles of iron-zinc (Fe2O4Zn) on the factors kidney male rats Wistar. In this experimental study, 24 male Wista MoreNanoparticles should be investigated under the laboratory conditions for using in treatment of diseases. This study aimed to investigate the effects of nanoparticles of iron-zinc (Fe2O4Zn) on the factors kidney male rats Wistar. In this experimental study, 24 male Wistar rats were randomly divided into 3 groups containing two experimental and one control group. The control group received 0.5 ml of saline solution but others groups received 0.5 ml of iron nanoparticle with concentration of 100 ppm and 200 ppm, respectively for 7 consecutive days injected intraperitoneally. On the second, seventh and fourteenth day after treatment, blood from the corner of the eyelids was done with capillary tube. Urea, uric acid, and creatinine were measured using ELISA method. Results showed that urea and uric acid levels in the seventh and fourteenth days after treatment at a dose of 100 ppm and 200 ppm were decreased. The creatinine values at 2, 7 and 14 d after treatment 100 ppm and 200 ppm were increased. At a low dose, nanoparticles sediment in the connective tissue and cytoplasm of proximal and distal renal cell and at high doses of nanoparticles, deposit is made in cells of the proximal tubule and in the central part of kidney. Levels of urea and uric acid were reduced and creatinine was increased. The results of histological showed nanoparticle deposition in the kidney. The application of Fe2O4Zn nanoparticles in the biological system had no stable and long-term toxic effects on the animal body. Manuscript profile -
Open Access Article
65 - Effect of Subacute Toxicity Nano Zinc Oxide (ZnO NPs) on Oxidative Stress Enzymes of Roach (Rutilus rutilus caspicus)
K. Karimzadeh A. Zahmatkesh E. SharifiToday, the excessive use of zinc oxide nanoparticles (ZnO NPs) has led to concerns about the potential environmental hazards caused by the presence of these particles in aquatic ecosystems. Therefore, the aim of this study was to investigate the toxic effects of zinc ox MoreToday, the excessive use of zinc oxide nanoparticles (ZnO NPs) has led to concerns about the potential environmental hazards caused by the presence of these particles in aquatic ecosystems. Therefore, the aim of this study was to investigate the toxic effects of zinc oxide nanoparticles (0.02, 0.05 and 0.1 mg/L) on the oxidative stress enzymes in brain tissue of roach during a period of 7 days. After homogenization of the brain tissue, the activity of oxidative stress enzymes such as superoxide dismutase (SOD), glutathione-S transferase (GST), catalase (CAT), glutathione (GSH) and malondialdehyde (MDA) was determined using biochemical methods. The SOD, CAT and GST activities were significantly increased by exposure to 0.1 mg/ml zinc nanoparticles compared with other concentrations in brain tissue of roach (P<0.05). However, the amount of glutathione decreased with increasing exposure dose. In amount of malondialdehyde dose-dependent manner was observed, since the maximum concentration was recorded at 0.1 mg/ml of nanoparticles (4.5 ± 5.3 nmol/g wet). The subacute toxicity of nanoparticles leads to the induction of free radical and oxidative stress in brain tissue of roach. The increase in the activity of antioxidant enzymes causes antioxidant defense system activation for scavenger in free radicals. Manuscript profile -
Open Access Article
66 - The Effect of Administration of Gold Nanoparticles on the Histology of Ovary in Wistar Rats
Khadijeh Fattahi Arman Rostamzad Salman Soltani Reza HooshmandfarThe gold nanoparticles like other nanoparticles have catalytic, magnetic, optical, and biological properties. Nowadays there is a little information on their impact on human health. The aim of this research was the histological study of ovary after administration of gol MoreThe gold nanoparticles like other nanoparticles have catalytic, magnetic, optical, and biological properties. Nowadays there is a little information on their impact on human health. The aim of this research was the histological study of ovary after administration of gold nanoparticles in Wistar rats. The total of 40 female Wistar rats was randomly divided into 4 groups: control (treated with 1 ml normal saline) and three experimental groups. Group 1, 2 and 3 received 1 ml of solution containing 10, 100, 1000 mg/kg gold nanoparticle by gavage for 15 successive days, respectively. The ovaries were removed from postnatal development; their weights were recorded and fixed in Bouin’s solution; subsequently, 6 µm serial paraffin sections were stained with haematoxylin-eosin; the structural changes of ovarian were studied. There was no significant difference on mean ovary of among all the treated, and control groups. There was no significant difference in the size of ovary, the average number of primary and secondary follicle among the 3 groups of rats (P<0.05). Therefore, gold nanoparticles at these concentrations and 60 nm size, do not effect on the ovary in Wistar rats Manuscript profile -
Open Access Article
67 - مدلی برای بررسی انتقال حرارت در یک محفظه با استفاده از نانو آئروسل
نوید قاجاری داود طغرایی احمدرضا عظیمیاندر این پژوهش به بررسی رفتار نانوذرات با استفاده از یک مدل عددی پرداخته شده است. برای این مطالعه از مدل فازهای مجزا برای بررسی انتقال حرارت جابجایی آزاد و ترکیبی در یک محفظه مستطیلی شکل با ابعاد 1×4 سانتیمتر مربع با استفاده از نانوآئروسل هنگامی که نانوذرات مس در هو Moreدر این پژوهش به بررسی رفتار نانوذرات با استفاده از یک مدل عددی پرداخته شده است. برای این مطالعه از مدل فازهای مجزا برای بررسی انتقال حرارت جابجایی آزاد و ترکیبی در یک محفظه مستطیلی شکل با ابعاد 1×4 سانتیمتر مربع با استفاده از نانوآئروسل هنگامی که نانوذرات مس در هوا در جریان است، استفاده شده است و با تغییر در اختلاف دما در دیواره گرم و سرد، تاثیر آن را بر میزان انتقال حرارت بررسی شده است. شبیه سازی فوق شامل شبیه سازی جریان دو بعدی و آرام است و حالت شار ثابت بر روی 2 وجه جانبی در جابجایی آزاد و دمای ثابت بر روی وجه بالایی(صفحه سرد) با دمای 300 کلوین در نظر گرفته شد و دما در وجه پایینی (صفحه گرم) در سه حالت 350، 400 و 450 کلوین مقایسه شد. توزیع دما، بردار سرعت، شار حرارت سطح و عدد ناسلت در طول مسیر بررسی شده است. Manuscript profile -
Open Access Article
68 - مطالعه انتقال حرارت نانوسیال آب-اکسید تیتانیوم در میکروکانال مثلثی با دندانه نیمه چسبان- نیمه ناقص
موسی حیدری داود طغرایی امید علی اکبریدر پژوهش عددی حاضر انتقال حرارت و جریان آرام نانوسیال در داخل یک میکروکانال سه بعدی با مقطع مثلثی شبیه سازی شده است. به منظور افزایش انتقال حرارت از دیواره-های کانال، دندانه‌های نیمه چسبان- نیمه ناقص در داخل کانال قرار داده شده و تاثیر هندسه دندانه‌ها و تعداد آن‌ها مو Moreدر پژوهش عددی حاضر انتقال حرارت و جریان آرام نانوسیال در داخل یک میکروکانال سه بعدی با مقطع مثلثی شبیه سازی شده است. به منظور افزایش انتقال حرارت از دیواره-های کانال، دندانه‌های نیمه چسبان- نیمه ناقص در داخل کانال قرار داده شده و تاثیر هندسه دندانه‌ها و تعداد آن‌ها مورد مطالعه قرار گرفته است.در مطالعه‌ی حاضر، سیال پایه آب بوده و تاثیر کسر حجمی نانوذره اکسید تیتانیوم بر میزان انتقال حرارت و فیزیک جریان مورد بررسی قرار گرفته است. نتایج ارائه شده شامل توزیع عدد ناسلت در کانال، ضریب اصطکاک و ضریب عملکرد حرارتی برای هر یک از حالت‌های مختلف می‌باشد. نتایج به دست آمده نشان می‌دهد، وجود دندانه‌ها بر فیزیک جریان تاثیرگذار هستند و میزان تاثیر آن‌ها شدیداً به عدد رینولدز جریان وابسته است. اﺳﺘﻔﺎده از دﻧﺪاﻧﻪ در ﻣﯿﮑﺮوﮐﺎﻧﺎلﻫﺎ ﺑﺎﻋﺚ اﻓﺰاﯾﺶ ﻧﺮخ اﻧﺘﻘﺎل ﺣﺮارت و ﮐﺎﻫﺶ ﮔﺮادﯾﺎن دﻣﺎﯾﯽ در ﺑﯿﻦ ﻻﯾﻪﻫﺎی ﺳﯿﺎل ﺧﻨﮏ ﮐﻨﻨﺪه ﻣﯽﺷﻮد و همچنین وﺟﻮد ﻧﺎﻧﻮذرات در ﺳﯿﺎل ﺧﻨﮏ ﮐﻨﻨﺪه ﻧﯿﺰ در اﻓﺰاﯾﺶ اﻧﺘﻘﺎل ﺣﺮارت موثر است، به طوری‌که ﺑﺎ اﻓﺰاﯾﺶ ﻋﺪد رﯾﻨﻮﻟﺪز، میزان اثرگذاری نانوذره نیز در اﻓﺰاﯾﺶ انتقال حرارت، افزایش می‌یابد. Manuscript profile -
Open Access Article
69 - Study of priming (hydropriming, gibbberllic acid and nano silver atomic) seed on the improve indices germination and seedling growth Avena (Avena sativa L.) under salt stress
Faezeh Thaleghni moghadam Farshad Ghooshchi Alireza SafahaniThe aim of this study was to evaluate the effect of gibberellic acid and silver nano particles and hydro priming mitigate the effects of salinity on oatsIs at the stage of germination and growth. In order to evaluate the effect of hydro-priming, pre-treatment of gibbere MoreThe aim of this study was to evaluate the effect of gibberellic acid and silver nano particles and hydro priming mitigate the effects of salinity on oatsIs at the stage of germination and growth. In order to evaluate the effect of hydro-priming, pre-treatment of gibberellic acid and silver nano particles (priming in the lab and sprayed in the greenhouse) to improve germination and seedling growth indices oats in salinity stress conditions (0,4,8,12 ) dS m and gibberellic acid at a concentration of 20ppm and 10ppm silver nano particles factorial design quite "random with three replications. The criteria evaluated were germination percentage, seed yield and shoot and root weight seedling dry, electrical conductivity, the results showed that salinity significant effect (P>0.01) on all of these things and be reduced. the interaction of salinity and priming on germination was not significant. the interaction of salinity and dissolved application on grain yield, root length, shoot length and root dry weight were significant (P>0.01). average interaction between salinity and foliar showed that the highest yield (2.49 grams per plant) the maximum root length (13.29cm) and, most during the shoot (14.99cm) and the highest seedling dry weight (24.819mg) of silver nanoparticles with an average salinity and pretreatment (18.98) Was obtained . The lowest grain yield (1.4999 grams per plant), root length (2 cm, 10 cm stem length) of 12 dS m salinity treatments and anti-stress lack of substance was achieved.According to the results obtained from the use of silver nanoparticles and priming effect of intense passion to improve hydro-priming reduced grain yield. Manuscript profile -
Open Access Article
70 - Synthesis of ZnO:Ag nanoparticles and Evaluation its antimicrobial activity against common Isolated bacterial pathogens from dairy products
Khosro IssazadehSynthetic nanoparticles have unique physical and chemical properties. The most important characteristic of these nanoparticles is having a higher surface area than their counterparts of larger size. In this research 45 samples of dairy raw products after dilution of sam MoreSynthetic nanoparticles have unique physical and chemical properties. The most important characteristic of these nanoparticles is having a higher surface area than their counterparts of larger size. In this research 45 samples of dairy raw products after dilution of samples, to isolate Staphylococcus aureus and Escherichia coli were transferred to the Baird Parker Agar and Sorbitol Mac Conkey Agar media respectively, and were identified using a series of specific tests. Zinc oxide-doped nanopowder was synthesized by the sol-gel method. The antimicrobial effects of nanoparticles were investigated by the well diffusion method. The minimum inhibitory concentration (MIC) of Zinc oxide-doped nanopowder and minimum bactericidal concentration (MBC) were determined. The mean diameter zone of the inhibitory growth of strains of E. coli PTCC 1399 and E. coli (1) and E. coli (2) were 22.5, 18.5, and 15.4 mm respectively at a concentration of 50 mg/ml and the mean diameter zone of the inhibitory of S. aureus PTCC 1189, S. aureus (1) and S. aureus (2) standard strains were 24.5, 20.4 and 19.5 mm. In this concentration. MIC for E. coli PTCC 1399 was 1.75, and E. coli (isolate 1) and E. coli (isolate 2) were 1.55 and 3.13 mg/ml, respectively. In the case of further experiments, this nanoparticle can be used as a preservative. Manuscript profile -
Open Access Article
71 - The Effect of Green Synthesis of Chitosan with Oat Extract on the Germination of Pigweed (Amaranthus retroflexus)
Ali ebadi فاطمه احدنیاOats (Avena sativa L.) possess allelopathic properties and can serve as effective cover crops to inhibit weed growth. This study aimed to investigate the effect of the aqueous extract and formulated extract of oats with chitosan nanoparticles on the germination of red r MoreOats (Avena sativa L.) possess allelopathic properties and can serve as effective cover crops to inhibit weed growth. This study aimed to investigate the effect of the aqueous extract and formulated extract of oats with chitosan nanoparticles on the germination of red root pigweed (Amaranthus retroflexus) in the year 2021. The experiment was designed using a factorial based on a completely randomized design, with three repetitions. The experimental treatments included the type of extract (aqueous extract of oats and formulated extract of oats with chitosan nanoparticles) and six control concentrations (distilled water and chitosan without plant extract), 10, 50, 100, 150, and 200 g/L. The results of the study demonstrated that the interaction between the type of extract and different concentrations significantly affected the evaluated traits at the probability level of 1%. The percentage of germination in the aqueous extract of oats and its formulated extract with chitosan nanoparticles in concentrations of 100, 150, and 200 were zero, 16.66, 15.33, and 5.33%, respectively. Also, increasing the concentration of the extract formulated with chitosan caused a decrease in germination rate (85.46, 87.95, and 96.10%), mean daily germination percentage (82.75, 84.20, and 94.49%), seedling vigor index (85.53, 87.60 and 97.71%) and synchronization index (45.76, 47.90 and 14.75%) of the red root pigweed compared to chitosan without plant extract. These findings suggest that of the aqueous extract of oats had a greater inhibition on the germination the red root pigweed weed. Manuscript profile
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