Original Research Article
Tayeb AB Matin; Nahid Ghasemi; Keivan Ghodrati; Majid Ramezani
Abstract
Here, green synthesis of silver nanoparticles (NPs) using aqueous extract of Scrophularia Striata was demonstrated. In order to obtain the best formation conditions of NPs, different physicochemical parameters such as volume of the extract, silver ion concentration, temperature and reaction time were ...
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Here, green synthesis of silver nanoparticles (NPs) using aqueous extract of Scrophularia Striata was demonstrated. In order to obtain the best formation conditions of NPs, different physicochemical parameters such as volume of the extract, silver ion concentration, temperature and reaction time were studied. Synthesized resultant NPs were characterized using UV, SEM, TEM, EDX, XRD, FT-IR and DLS analyses. A color change to brown after adding the extract to the silver nitrate solution was observed which indicated the formation of silver NPs. The synthesized silver NPs by Scrophularia Striata extract showed the highest absorbance at 426 nm. Plants use as stabilizing and reducing agents for NPs, due to their antioxidant properties and many secondary compounds.
Original Research Article
Saeed Hayati; Reza Yazdani; Soghra Fallahi; Zivar Atashbar; Seyed Ashkan Tabibzadeh Dezfuli
Abstract
The present research aimed to compare the effectiveness of promethazine and diazepam in patients suffering from acute peripheral vertigo. This is a double blind clinical trial with a sample of 154 patients visiting the emergency section of Shahid Mohammadi Hospital in Bandar Abbas in 2017-18. The participants ...
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The present research aimed to compare the effectiveness of promethazine and diazepam in patients suffering from acute peripheral vertigo. This is a double blind clinical trial with a sample of 154 patients visiting the emergency section of Shahid Mohammadi Hospital in Bandar Abbas in 2017-18. The participants were randomly divided into two groups of 77, one treated with intravenous promethazine (50 mg) and the other with intravenous Diazepam (10 mg). The severity of vertigo was measured qualitatively and quantitatively 20 minutes later in both groups. Participants were 46 (29.9%) male and 108 (70.1%) female visiting the emergency section of hospital. The mean score of vertigo severity in Promethazine group was 44.44±17.94 and that of Diazepam group was 2.49±+3.87. The severity scores before and after the treatment in promethazine group were respectively 7.75±1.59 and 2.72±1.93. The mean scores of vertigo severity before and after the treatment in promethazine group was -5.04+2.10 and in the diazepam group it was -3.83+3.09. The intergroup difference was statistically significant (p=.013). The results revealed that intravenous promethazine and diazepam applied 20 minutes after prescription are both effective in controlling the severity of vertigo. Considering the probability of occurrence of extrapyramidal side-effects it can be suggested that the infusion of this medication be done slowly and take longer time. Meanwhile, vital signs should be precisely controlled.
Original Research Article
Mehri Deilam; Ashraf Sadat Ghasemi; Fereydoun Ashrafi
Abstract
In this research, Bendamustine anticancer drug in main and excited states in gaseous phase and in water, ethanol and methanol solvent phases have studied, using DFT and at MPW1PW91/6-311++G(d, p) theoretical level. The molecules of solvent affected the equilibrium structure of species. The effects of ...
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In this research, Bendamustine anticancer drug in main and excited states in gaseous phase and in water, ethanol and methanol solvent phases have studied, using DFT and at MPW1PW91/6-311++G(d, p) theoretical level. The molecules of solvent affected the equilibrium structure of species. The effects of solvents have studied by Polarized continuum model (PCM). The optimized structural parameters in gaseous and in water, ethanol and methanol solvent phases as frequency data, relative energy, dipole moment, the energy of highest occupied molecular orbital (HOMO), the energy of lowest unoccupied molecular orbital (LUMO), density functional graphs and gap energies have calculated. The results of theoretical computations confirm that the structure of drug, in both the main and the excited states, is more stable in liquid phase than in gaseous phase, and most stable in water. The computation results confirm that the drug stability increase by increasing in polarizability of solvent.
Original Research Article
Tayeb AB Matin; Nahid Ghasemi; Keivan Ghodrati; Majid Ramezani
Abstract
In this study, at first, the biosynthesis of silver nanoparticles (Ag NPs) using an aqueous extract of Thymbra spicataL was studied and then, the shape and size of synthesized NPs were characterized by different analysis such as UV-Vis, TEM, SEM, EDX, XRD, DLS and FT-IR. The synthesized Ag NPs were evaluated ...
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In this study, at first, the biosynthesis of silver nanoparticles (Ag NPs) using an aqueous extract of Thymbra spicataL was studied and then, the shape and size of synthesized NPs were characterized by different analysis such as UV-Vis, TEM, SEM, EDX, XRD, DLS and FT-IR. The synthesized Ag NPs were evaluated for their antibacterial activity against Escherichia coli (PTTC 1707), Staphylococcus aureus (PTTC 1112), Bacillus cereus (PTTC 1154) and Aspergillus Niger (PTTC 5012) and Candida albicans (PTTC5027) by well diffusion method and determination of minimum inhibitory concentration (MIC). Ag NPs displayed significant antimicrobial activity against the specimens, and they prevented the growth of bacteria and fungi at low concentrations.
Original Research Article
Sima Mehdizadeh; Nahid Ghasemi; Majid Ramezani
Abstract
Silver nanoparticles (NPs) have been synthesized by aqueous Beetroot extract. Effective parameters on the synthesis of silver NPs like pH, extract volume, silver nitrate concentration and time of reaction have been investigated at room temperature. The synthesized silver NPs have been studied with different ...
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Silver nanoparticles (NPs) have been synthesized by aqueous Beetroot extract. Effective parameters on the synthesis of silver NPs like pH, extract volume, silver nitrate concentration and time of reaction have been investigated at room temperature. The synthesized silver NPs have been studied with different analysis like UV-Vis, FT-IR, FE-SEM, TEM, and XRD. Our analysis indicates that the level of Surface Plasmon is 439 nm. The shape of NPs is spherical and the size is 20-30 nm by using FE-SEM and TEM technique. Four bacteria (Escherichia coli, Staphylococcus aureus, Bacillus subtilis and Salmonella typhymurium) were used as references bacteria to analyze the antibacterial effect. Antibacterial results show, gram negative bacteria are so sensitive to synthesized silver NP. Recommended method was completely eco-friendly.
Original Research Article
Ali Jalaeian-Hadad; Abolghasem Davoodnia; Niloofar Tavakoli-Hoseini; Farzaneh Tajfirooz
Abstract
A nanomagnetic acidic catalyst (CuFe2O4@SiO2-OSO3H) was prepared by the chemical anchoring of sulfuric acid onto the surface of modified CuFe2O4 magnetic nanoparticles and characterized using FT-IR, SEM, EDX, and VSM techniques. The results confirmed that the sulfuric acid is well dispersed on the surface ...
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A nanomagnetic acidic catalyst (CuFe2O4@SiO2-OSO3H) was prepared by the chemical anchoring of sulfuric acid onto the surface of modified CuFe2O4 magnetic nanoparticles and characterized using FT-IR, SEM, EDX, and VSM techniques. The results confirmed that the sulfuric acid is well dispersed on the surface of the nanomagnetic support. The catalytic activity of CuFe2O4@SiO2-OSO3H was evaluated in the synthesis of 1,8-dioxo-octahydroxanthenes under solvent-free conditions. The reactions using this nanomagnetic acidic catalyst could be carried out in lower than 12 min with excellent yields. Also, the catalyst was easily isolated from the reaction mixture by an external magnet and used at least four times without significant loss of activity.
Original Research Article
Amir Samimi; Soroush Zarinabadi; Amir Hossein Shahbazi Kotanaei; Alireza Azimi; Masoumeh Mirzaei
Abstract
Nowadays, computational tools for analyzing and collecting data in the operation of petroleum units are essential. One of the methods is the classification or regression is to step in the overall process of knowledge extraction. In this article, one of specific type of decision called the conditional ...
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Nowadays, computational tools for analyzing and collecting data in the operation of petroleum units are essential. One of the methods is the classification or regression is to step in the overall process of knowledge extraction. In this article, one of specific type of decision called the conditional contract arrangement, is used to extract the relevant knowledge in Catalytic Reforming Units (CRU) for 4 factors: Density, PH, total iron ions in vessels (S.FE) and H2S. All of these factors are related to corrosion in CRU units and this paper aims to optimize some conditions to eliminate it. In this regard, using ammonium water with a specific range and pH can be helpful. According to the obtained results the best range of density (in Feed) is less than 0.515 kg/m3, PH (water in vessels) is more than 6.7, S.FE is less than 1.5 ppm and H2S in recycle gas is less than 700 ppm. The outcomes also show how this approach can be used to gain insight into some refineries and how to deliver results in a comprehensible and user-friendly way.
Original Research Article
Mohammad Zakarianezhad; Batool Makiabadi; Motahare Shool; Mahboobeh Hasanpour
Abstract
Intermolecular proton transfer in barbituric acid (BA) both in the gas phase and in the presence of water molecule was investigated using the B3LYP method with aug-cc-pVDZ basis set. The overall process involves keto-enol and lactam-lactim tautomerism that occurs. The most stable form of barbituric acid ...
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Intermolecular proton transfer in barbituric acid (BA) both in the gas phase and in the presence of water molecule was investigated using the B3LYP method with aug-cc-pVDZ basis set. The overall process involves keto-enol and lactam-lactim tautomerism that occurs. The most stable form of barbituric acid turns into the intermediates with three-step proton transfer at three different positions of the structure of this compound. Then, these intermediates become to the final products passing through two competing processes. In order to determine the priority of each competitive process, energy changes of all possible tautomeric forms were investigated along with the role of solvent molecules in multiple routes. Also, transposition in the proton transfer process makes changes in the electron transfer energy which was investigated both in the gas phase and in the presence of water molecules. Frequency calculations performed to characterize ground and transition states and calculation of zero point energies. Natural bond orbital analysis and topological property of electron density were investigated using natural bond orbital (NBO) and atoms in molecules (AIM) analysis. From the results, all proton transfer process in the gas phase and in the presence of the solvent molecule (water) is exothermic and non-spontaneous. In the gas phase and in the water assisted condition, the route 1b is kinetically more preferred. Despite the increase of the increase of ring resonance of stronger hydrogen bonds in the product compared to the reactant, the products are more unstable than the reactant. Therefore, the only factor can make the product unstable is the severe decrease of LP (N) →σ* (C-O) electron transfer energy.
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