A highly effective route for removal of Hg²⁺ from the waste water using 3-nitrobenzelidenemalononitrile as a modifier of Fe₃O₄@SiO₂ nanoparticles

Mosleh Mehryar,Ghasem Marandi Techno-Press 2024 Advances in nano research Vol.16 No.1

SiO₂-coated magnetic nanoparticles (Fe₃O₄@SiO₂ NPs) were modified by 3-nitrobenzelidenmalononitrile and used as green linkages for removal of Hg²⁺ form the wastewater. In this research, it has been attempted to refer to the harmful effects of mercury ions for living things and how to remove such ions using very easy and practical technique. This study shows that by optimizing the test conditions, the efficiency of the removal of harmful ions such as mercury from the water contaminated with these ions can be increased. Conditions such as temperature, speed of agitation, pH of solution were tested for removal of mercury ions. The advantages of this method over other methods listed in the article are the rapid and easy nanocry synthesis. The generated and modified Fe₃O₄@SiO₂ nanoparticles were characterized by X-ray diffraction, fourier transform infrared and scanning electron microscopy spectroscopy. The results show that the synthesized magnetic nanoparticles have the excellent performance for the removal of mercury(II) ion from the waste water.

Evaluation of thermal stability of confectionary sunflower protein isolate and its effect on nanoparticulation and particle size of the produced nanoparticles

Laleh Mehryar,Mohsen Esmaiili,Fariba Zeynali,Rohollah Sadeghi,Mehdi Imani 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.3

In this study, the effect of different defatting conditions on heat stability of confectionary sunflower protein isolate (SnPI) and the particle size of the produced nanoparticles was investigated. The evaluated factors included temperatures of defatting (40, 50, and 60 C), time of defatting (2, 6, and 10 h), and the amount of activated carbon (0, 25, and 50% of sample weight). The results of the central composite design showed a significant effect (P\0.05) among the studied factors, where denaturation temperature and particle size of SnPI nanoparticles were found to be in the ranges of 75.05–89.12 C and 268–1594 nm, respectively. Moreover, the interaction of activated carbon with temperature and time of defatting proved to be influential factors for the heat stability of confectionary SnPI.

Nitrogen assessment by remote sensing and multispectral imagery in maize (Zea mays L.)

Jaberi-Aghdam Mehryar,Momayezi Mohammad Reza,Bagheri Nikrooz,Azizi Peyman,Nasri Mohammad 한국작물학회 2024 Journal of crop science and biotechnology Vol.27 No.1

Over-application of nitrogen fertilizers in farm lands is the main reason to contaminate nitrogen components in the environment. Nitrogen can play a main role on the plant growth, biomass and crop yield. Therefore, the aim of this study was to evaluate diferent nitrogen rates and the response of maize plant characteristics on some vegetative indices using aerial multispectral imaging. The study was carried out in an experimental farm in Varamin city (35.80°N, 51.40°E), Tehran province, Iran. The experiment was performed in Randomized Complete Block Design (RCBD) with four treatments and two sampling stage in four replications. The treatments were diferent nitrogen rates included none (as control), 250, 500 and 750 kg urea ha−1 fertilizer which was applied by irrigation water and two sampling stage, 8-leaf stage (V8) and tasseling stage. Data analysis based on the diferent growth stages showed that, there were signifcantly increased in the average plant height (198 cm), total dry weight (336.73 g), SPAD index, and leaf nitrogen content in both V8 and tasseling stage. Based on our results, in the V8 growth stage chlorophyll index, modifed triangle vegetation index (MTVI), and green model index with the correlation coefcients 0.88, 0.86, and 0.80, respectively, were the most suitable indicators for detecting nitrogen stress in this edaphic and climatic conditions for this plant. Generally, it can be concluded that chlorophyll index in the V8 growth stage and nitrogen refectance index (NRI) in the tasseling growth stage are the most appropriate indicators for detecting nitrogen stress in that studied area. As a result, aerial multispectral imaging is a reliable technology to assist farmers in fertilizing plants at the right time and place, as well as the amount that the plants need. So, this technology is in accordance with the precious agriculture’ goals and eco-friendly

Down-regulation of the autophagy gene, ATG7, protects bone marrow-derived mesenchymal stem cells from stressful conditions

Sedigheh Molaei,Mehryar Habibi Roudkenar,Fatemeh Amiri,Mozhgan Dehghan Harati,Marzie Bahadori,Fatemeh Jaleh,Mohammad Ali Jalili,Amaneh Mohammadi Roushandeh 대한혈액학회 2015 Blood Research Vol.50 No.2

Background Mesenchymal stem cells (MSCs) are valuable for cell-based therapy. However, their applicationis limited owing to their low survival rate when exposed to stressful conditions. Autophagy, the process by which cells recycle the cytoplasm and dispose of defectiveorganelles, is activated by stress stimuli to adapt, tolerate adverse conditions, or triggerthe apoptotic machinery. This study aimed to determine whether regulation of autophagywould affect the survival of MSCs under stress conditions. Methods Autophagy was induced in bone marrow-derived MSCs (BM-MSCs) by rapamycin, andwas inhibited via shRNA-mediated knockdown of the autophagy specific gene, ATG7. ATG7 expression in BM-MSCs was evaluated by reverse transcription polymerase chainreaction (RT-PCR), western blot, and quantitative PCR (qPCR). Cells were then exposedto harsh microenvironments, and a water-soluble tetrazolium salt (WST)-1 assay was performedto determine the cytotoxic effects of the stressful conditions on cells. Results Of 4 specific ATG7-inhibitor clones analyzed, only shRNA clone 3 decreased ATG7expression. Under normal conditions, the induction of autophagy slightly increased theviability of MSCs while autophagy inhibition decreased their viability. However, understressful conditions such as hypoxia, serum deprivation, and oxidative stress, the inductionof autophagy resulted in cell death, while its inhibition potentiated MSCs to withstandthe stress conditions. The viability of autophagy-suppressed MSCs was significantlyhigher than that of relevant controls (P<0.05, P<0.01 and P<0.001). Conclusion Autophagy modulation in MSCs can be proposed as a new strategy to improve their survivalrate in stressful microenvironments.

Down-regulation of the autophagy gene, ATG7, protects bone marrow-derived mesenchymal stem cells from stressful conditions

Sedigheh Molaei,Mehryar Habibi Roudkenar,Fatemeh Amiri,Mozhgan Dehghan Harati,Marzie Bahadori,Fatemeh Jaleh,Mohammad Ali Jalili,Amaneh Mohammadi Roushandeh 대한혈액학회 2015 Blood Research Vol.50 No.2

Background Mesenchymal stem cells (MSCs) are valuable for cell-based therapy. However, their applicationis limited owing to their low survival rate when exposed to stressful conditions. Autophagy, the process by which cells recycle the cytoplasm and dispose of defectiveorganelles, is activated by stress stimuli to adapt, tolerate adverse conditions, or triggerthe apoptotic machinery. This study aimed to determine whether regulation of autophagywould affect the survival of MSCs under stress conditions. Methods Autophagy was induced in bone marrow-derived MSCs (BM-MSCs) by rapamycin, andwas inhibited via shRNA-mediated knockdown of the autophagy specific gene, ATG7. ATG7 expression in BM-MSCs was evaluated by reverse transcription polymerase chainreaction (RT-PCR), western blot, and quantitative PCR (qPCR). Cells were then exposedto harsh microenvironments, and a water-soluble tetrazolium salt (WST)-1 assay was performedto determine the cytotoxic effects of the stressful conditions on cells. Results Of 4 specific ATG7-inhibitor clones analyzed, only shRNA clone 3 decreased ATG7expression. Under normal conditions, the induction of autophagy slightly increased theviability of MSCs while autophagy inhibition decreased their viability. However, understressful conditions such as hypoxia, serum deprivation, and oxidative stress, the inductionof autophagy resulted in cell death, while its inhibition potentiated MSCs to withstandthe stress conditions. The viability of autophagy-suppressed MSCs was significantlyhigher than that of relevant controls (P<0.05, P<0.01 and P<0.001). Conclusion Autophagy modulation in MSCs can be proposed as a new strategy to improve their survivalrate in stressful microenvironments.

Numerical analysis of two and three dimensional buoyancy driven water-exit of a circular cylinder

Shahab Moshari,Amir Hossein Nikseresht,Reza Mehryar 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.2

With the development of the technology of underwater moving bodies, the need for developing the know-ledge of surface effect interaction of free surface and underwater moving bodies is increased. Hence, the two-phase flow is a subject which is interesting for many researchers all around the world. In this paper, the non-linear free sur-face deformations which occur during the water-exit of a circular cylinder due to its buoyancy are solved using finite volume discretization based code, and using Volume of Fluid (VOF) scheme for solving two phase flow. Dynamic mesh model is used to simulate dynamic motion of the cylinder. In addition, the effect of cylinder mass in presence of an ex-ternal force is studied. Moreover, the oblique exit and entry of a circular cylinder with two exit angles is simulated. At last, water-exit of a circular cylinder in six degrees of freedom is simulated in 3D using parallel processing. The simula-tion errors of present work (using VOF method) for maximum velocity and height of a circular cylinder are less than the corresponding errors of level set method reported by previous researchers. Oblique exit shows interesting results; formation of waves caused by exit of the cylinder, wave motion in horizontal direction and the air trapped between the waves are observable. In 3D simulation the visualization of water motion on the top surface of the cylinder and the free surface breaking on the front and back faces of the 3D cylinder at the exit phase are observed which cannot be seen in 2D simulation. Comparing the results, 3D simulation shows better agreement with experimental data, specially in the maximum height position of the cylinder.

Effect of intravenous magnesium on postoperative pain control for major abdominal surgery: a randomized double-blinded study

Yazdi Arash Peivandi,Esmaeeli Mehrdad,Gilani Mehryar Taghavi 대한마취통증의학회 2022 Anesthesia and pain medicine Vol.17 No.3

Background: Magnesium sulfate has been used in different studies as a pain control agent; however, the results are contradictory. This study aimed to evaluate the effect of magnesium sulfate on postoperative pain management during abdominal surgery. Methods: This randomized double-blinded study involved 84 patients candidates for abdominal surgery, who were divided into two groups (42 patients in each group). In the magnesium group, 25 mg/kg magnesium sulfate was infused for 1 h; then, 100 mg/kg/24 h was infused in the intensive care unit. The patients’ pain intensity, which was the primary outcome, was assessed using the numeric rating scale (NRS) every 3 h. If the NRS was > 3, morphine was used and evaluated as a secondary outcome after 24 h. The patients and nurses who assessed the patients were blinded to the drug groups. The results were analyzed using SPSS ver. 19 software, and statistical significance was set at P < 0.05.Results: Age, sex, body mass index (BMI) and surgery duration were similar between the groups. The pain intensity was 4 ± 0.2 in the control and 3.8 ± 0.2 in the magnesium group at first and then 3.98 ± 0.2 in the control and 3.45 ± 0.2 in the magnesium group at the third hour, which were similar in both groups (P = 0.39 and P = 0.17, respectively), but thereafter between 6 and 24 h, the pain severity was significantly lower in the magnesium group (4.4 ± 1.3 in the control and 3.34 ± 1 in the magnesium group at 6th hour and P = 0.001). In addition, morphine intake in the first 24 h in the two groups had a significant difference, with 13.2 ± 5.7 in control group and 8 ± 3.5 in magnesium group (P = 0.001). Hemodynamic state and muscle relaxation were similar in both groups.Conclusions: In this study, intravenous magnesium sulfate after abdominal surgeries for 24 h resolved the pain intensity after six hours and reduced morphine dosage.

Numerical analysis of two and three dimensional buoyancy driven water-exit of a circular cylinder

Moshari, Shahab,Nikseresht, Amir Hossein,Mehryar, Reza The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.2

With the development of the technology of underwater moving bodies, the need for developing the knowledge of surface effect interaction of free surface and underwater moving bodies is increased. Hence, the two-phase flow is a subject which is interesting for many researchers all around the world. In this paper, the non-linear free surface deformations which occur during the water-exit of a circular cylinder due to its buoyancy are solved using finite volume discretization based code, and using Volume of Fluid (VOF) scheme for solving two phase flow. Dynamic mesh model is used to simulate dynamic motion of the cylinder. In addition, the effect of cylinder mass in presence of an external force is studied. Moreover, the oblique exit and entry of a circular cylinder with two exit angles is simulated. At last, water-exit of a circular cylinder in six degrees of freedom is simulated in 3D using parallel processing. The simulation errors of present work (using VOF method) for maximum velocity and height of a circular cylinder are less than the corresponding errors of level set method reported by previous researchers. Oblique exit shows interesting results; formation of waves caused by exit of the cylinder, wave motion in horizontal direction and the air trapped between the waves are observable. In 3D simulation the visualization of water motion on the top surface of the cylinder and the free surface breaking on the front and back faces of the 3D cylinder at the exit phase are observed which cannot be seen in 2D simulation. Comparing the results, 3D simulation shows better agreement with experimental data, specially in the maximum height position of the cylinder.

Reopening of dental clinics during SARS-CoV-2 pandemic: an evidence-based review of literature for clinical interventions

Keyhan, Seied Omid,Fallahi, Hamid Reza,Motamedi, Amin,Khoshkam, Vahid,Mehryar, Paymon,Moghaddas, Omid,Cheshmi, Behzad,Firoozi, Parsa,Yousefi, Parisa,Houshmand, Behzad Korean Association of Maxillofacial Plastic and Re 2020 Maxillofacial Plastic Reconstructive Surgery Vol.42 No.-

Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes serious acute respiratory diseases including pneumonia and bronchitis with approximately 2.3% fatality occurrence. Main body: This study argues the main concepts that need to be considered for the gradual reopening of dental offices include treatment planning approaches, fundamental elements needed to prevent transmission of SARS-CoV-2 virus in dental healthcare settings, personal protection equipment (PPE) for dental health care providers, environmental measures, adjunctive measures, and rapid point of care tests in dental offices. Conclusion: This article seeks to provide an overview of existing scientific evidence to suggest a guideline for reopening dental offices.