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On Water CuSO<sub>4</sub>. 5H<sub>2</sub>O-catalyzed Synthesis of 2-amino-4H-chromenes
Behbahani, Farahnaz Kargar,Maryam, Sadeghi Korean Chemical Society 2013 대한화학회지 Vol.57 No.3
Sustainable development is a balance between environment and development. Sustainable development requires sustainable supplies of clean, affordable, and renewable energy sources that do not cause negative impact to the society. This article introduces a green chemistry method to synthesize 2-amino-4H-chromenes that reduces or eliminates the use and generation of hazardous substances in the design, manufacture, and application of chemical products. This method is described using copper (II) sulfate pentahydrate, as a green and reusable catalyst on water. The products were obtained at very good yields, short reaction time, and at lower cost than other reported procedures.
Behbahani, F.K.,Farahani, M.,Oskooie, H.A. Korean Chemical Society 2011 대한화학회지 Vol.55 No.4
알코올과 페놀 계 화합물을 아실화시키는 반응에서, iron (III) phosphate 촉매를 사용했을 때에, 좋은 수율로 아실화 화합물을 얻었다. Iron (III) phosphate 촉매는 또한 친환경 반응에 재사용할 수 있는 친환경 촉매이다. Iron (III) phosphate was employed as an efficient catalyst for the chemo selective acetylation of alcohols and phenols under solvent free condition at room temperature and with high yields. Iron (III) phosphate is also a potential green catalyst due to solid intrinsically, reusable and with high catalytic activity.
Synthesis of 2-Amino-3-cyano-7-hydroxy-4H-chromenes Using L-Proline as a Biocatalyst
Behbahani, Farahnaz K.,Mehraban, Sima Korean Chemical Society 2015 대한화학회지 Vol.59 No.4
Three-component one-pot synthesis of 2-amino-3-cyano-7-hydroxy-4H-chromenes, which have been reported from condensation of malononitrile, aryl aldehydes and resorcinol in the presence of L-proline under reflux conditions in ethanol.
Synthesis of 1,2,3,4-Tetrahydroquinolines Using AlCl<sub>3</sub> in Aqua Mediated
Behbahani, Farahnaz K.,Ziaei, Parisa Korean Chemical Society 2014 대한화학회지 Vol.58 No.1
Catalytic performance of Lewis acids have been investigated in the synthesis of 1,2,3,4-tetrahydroquinolines via cyclocondensation reaction of aniline derivatives with cyclic enol ethers such as 3,4-dihydro-2H-pyran and 2,3-dihydrofuran. The catalytic activity of various of these catalysts in different solvents was compared with other classical catalysts such as KSF clay (1.5 g), $InCl_3$ (10-20 mol%), $ZrOCl_2$ (10 mol%), $Sc(OTf)_3$ (3 mol%), PANI-$InCl_3$ (10 mol%), $I_2$ (20 mol%), $InCl_3$ (5 mol%), 4-npa (25 mol%) and Cellulose-$SO_3H$ (0.03 g).
Mohammad Behbahani,Fatemeh Najafi,Mostafa M. Amini,Omid Sadeg,Akbar Bagheri,Parmoon Ghareh Hassanlou 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this paper, functionalized MCM-41 nanoporous silica with 3,4-dihydroxybenzaldehyde was applied for trace determination of copper, silver, gold and palladium in real samples. The content of solutions containing the mentioned metals was determined by flame atomic absorption spectrometry (FAAS), and the limit of detection was 0.09, 0.03, 0.5 and 0.08 ng mL 1 for gold, copper, silver, and palladium, respectively. The recoveries and precisions for mentioned ions were >97.0% and <3%, respectively. The adsorption capacity of the modified MCM-41 was 290 mg g 1 for gold, 130 mg g 1 for copper, 160 mg g 1 for silver and 155 mg g 1 for palladium, respectively.
Mohammadian-Behbahani Mohammad-Reza 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.9
Radiation detection at high count rate suffers from pulse pile-up, where the counting data and energy information of the system are affected by the overlapping of the system output pulses. There exist various pile-up correction strategies to recover the true information of the pulses, among which pulse-tail extrapolation is a well-known method focused on in this study. Present work aims to use a mono-exponential model for extrapolating the pileup-distorted trailing edge of a pulse, to provide a reference line for calculating the true amplitude of its subsequent overlapping pulse. To this goal, the auto-regression on linear operations (ARLO) method is examined and compared with two integrationbased methods (the Foss and the Matheson methods), as well as the non-linear least squares (NLS) method. Despite a higher sensitivity to noise, the ARLO method was able to provide a simple, non-iterative solution with a performance over 400 times faster than the NLS algorithm, according to the analysis of a high count rate set of experimental pulses from a NaI(Tl) detection system. Foss and Matheson methods also provided solutions reasonably faster than NLS (but not surpassing ARLO), performing exactly the same as each other with results very close to NLS, benefiting from their non-iterative nature.
Non-iterative pulse tail extrapolation algorithms for correcting nuclear pulse pile-up
Mohammad-Reza Mohammadian-Behbahani 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12
Radiation detection systems working at high count rates suffer from the overlapping of their output electric pulses, known as pulse pile-up phenomenon, resulting in spectrum distortion and degradation of the energy resolution. Pulse tail extrapolation is a pile-up correction method which tries to restore the shifted baseline of a piled-up pulse by extrapolating the overlapped part of its preceding pulse. This needs a mathematical model which is almost always nonlinear, fitted usually by a nonlinear least squares (NLS) technique. NLS is an iterative, potentially time-consuming method. The main idea of the present study is to replace the NLS technique by an integration-based non-iterative method (NIM) for pulse tail extrapolation by an exponential model. The idea of linear extrapolation, as another non-iterative method, is also investigated. Analysis of experimental data of a NaI(Tl) radiation detector shows that the proposed non-iterative method is able to provide a corrected spectrum quite similar with the NLS method, with a dramatically reduced computation time and complexity of the algorithm. The linear extrapolation approach suffers from a poor energy resolution and throughput rate in comparison with NIM and NLS techniques, but provides the shortest computation time.
Omics and CRISPR in CHO bioproduction: a state-of-the-art review
Soofia Sorourian,Abbas Behzad Behbahani,Gholamreza Rafiei Dehbidi,Farahnaz Zare,Safar Farajnia,Haniyeh Najafi,Fatemeh Safari 한국생물공학회 2024 Biotechnology and Bioprocess Engineering Vol.29 No.3
Chinese hamster ovary (CHO) cells have been routinely used as a factory for recombinant proteins for several years, and their improvements have been the focus of consideration. Over the past two decades, omics have been developed that have great momentum for the future, equipped with nucleic acid sequencing, mass spectrometry, peptide sequencing, and statistical and computational capabilities. Functional omics, including genomics, transcriptomics, proteomics, epigenomics, metabolomics, and glycomics, have been recruited to promote CHO cell productivity. Recent breakthrough advances in CRISPR systems of this century are revolutionizing cell research and development. In recent years, various researchers have used the CRISPR system for gene knockout/in, gene activation or repression, epigenetic modulation, etc., in CHO cells as a genome-editing tool kit. Omics and CRISPR technology is poised to identify genes involved in increasing recombinant protein production and molecular insights. The development of novel technologies to modify CHO genome such as CRISPR/Cas9 and the establishment of a suffi ciently broad range of molecular and biological data will help to develop new approaches to improve commercially valuable traits in CHO cells. The CRISPR/Cas9 technology enables fast, precise, and simple modifi cation of the mammalian genome. This technology has numerous applications, including genome-wide screening and the control or alteration of specifi c genes. Researchers in the CHO community can now easily modify the genome to study the mechanisms involved in high-level protein synthesis and desired product quality attributes. This review provides an overview of omics and the CRISPR system as a toolbox for the optimization of recombinant protein yield in CHO cells.
Fluid flow effects on diffusion layer and current density for electrochemical systems
Behzad Ebad,Morteza Behbahani-Nejad,Maziar Changizian,Ioan Pop 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.9
The effects of flow field upon the distribution of ionic concentration, electric potential, concentration boundary layer thickness, and electric current density were investigated. A modified numerical scheme is proposed to simulate the corresponding electrochemical system which is governed by nonlinear partial differential equations. Seven types of geometries and various flow fields with Reynolds numbers up to 2100 are considered. The obtained results indicate the current numerical method can successfully simulate the increase of current density on the cathode as the applied potential cell increases, and that rise will continue until the limiting current density is reached. To predict the effect of fluid flow, the proposed scheme is applied for various Peclet numbers. The increase of current density for Peclet numbers between 1 and 104 is quite evident. But for large Peclet numbers between 104 and 107 , the current density increases gradually. The results also show that as the anode size is doubled, the maximum current density occurs at the leading and trailing edges. However, if the cathode size is doubled, the maximum current density occurs at the center regions of it. Knowing the regions where current density is extremum helps electochemical system designers to control the parameters of the corresponding process.
A new approach for modeling of multicomponent gas hydrate formation
Vahid Mohebbi,Reza Mosayyebi Behbahani,Abbas Naderifar 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
Several models have been proposed to investigate the kinetics of gas hydrate formation. The main differences between the proposed models are the definition of the driving force, thermodynamics approach and the number of resistances to study the gas consumption by the hydrate phase. This paper concentrates on gas hydrate formation from multicomponent mixture, which has not been much studied before. In the present research, chemical potential has been considered as the driving force and, consequently, a new resistance coefficient was introduced. A complete discussion and reasonable assumptions has been provided to support this modelling.