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Preparation of Silica-bonded Propyl-diethylene-triamine-N- sulfamic Acid as a Recyclable Catalyst for Chemoselective Synthesis of 1,1-Diacetates

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Chinese Journal of Chemistry 2011年第11期29卷 2361-2367页

作者： Nouri Sefat, Maryam Deris, Abdolah Niknam, Khodabakhsh Chemistry Department Faculty of Sciences Persian Gulf University Bushehr 75169 Iran

A simple and efficient procedure for the preparation of silica-bonded propyl-diethylene-triamine-N-sulfamic acid （SPDTSA） by reaction of 3-diethylenetriamine-propylsilica （DTPS） and chlorosulfonic acid in chloroform is described. Silica-bonded propyl-diethylene-triamine-N-sulfamic acid is employed as a recyclable catalyst for the synthesis of 1,1-diacetates from aromatic aldehydes and acetic anhydride under mild and solvent-free conditions at room temperature. Catalyst could be recycled for several times without any additional treatment.

关键词： silica-bonded propyl-diethylene-triamine-N-sulfamic acid 1,1-diacetates aromatic aldehydes catalyst solvent-free

Silica-bonded S-sulfonic Acid as a Recyclable Catalyst for Synthesis of 2,3-Dihydroquinazolin-4（1H）-ones

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Chinese Journal of Chemistry 2011年第7期29卷 1417-1422页

作者： Niknam, Khodabakhsh Mohammadizadeh, Mohammad Reza Mirzaee, Salimeh Chemistry Department Faculty of Sciences Persian Gulf University Bushehr 75169 Iran

2,3-Dihydroquinazolin-4（1H）-one derivatives were synthesized via a one-pot, three component reaction of isatoic anhydride and an aromatic aldehyde with ammonium acetate or primary amine catalyzed by silica-bonded S-sulfonic acid in ethanol at 80 ℃. The reaction work-up is simple and the catalyst is easily separated from the products by filtration. The heterogeneous catalyst was recycled for ten runs upon the condensation reaction of isa- toic anhydride and 4-chlorobenzaldehyde with ammonium acetate without losing its catalytic activity.

关键词： silica-bonded S-sulfonic acid aldehydes 2,3-dihydroquinazolin-4(1H)-one isatoic anhydride amines

Pullout behavior of polymeric strip in compacted dry granular soil under cyclic tensile load conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 968-976页

作者： Sajad Razzazan Amin Keshavarz Mansour Mosallanezhad School of Engineering Persian Gulf University Department of Civil and Environmental Engineering Shiraz University

Assessment of the reinforcement behavior of soil under cyclic and monotonic loads is of great impor- tance in the safe design of mechanically stabilized earth walls, In this article, the method of conducting a multistage pullout （MSP） test on the polymeric strip （PS） is presented, The post-cyclic behavior of the reinforcement can be evaluated using a large-scale pullout apparatus adopting MSP test and one-stage pullout （OSP） test procedures, This research investigates the effects of various factors including load amplitude, load frequency, number of load cycles and vertical effective stress on the peak apparent coefficient of friction mobilized at the soil-PS interface and the pullout resistance of the PS buried in dry sandy soil. The results illustrate that changing the cyclic tensile load frequency from 0,1 Hz to 0,5 Hz does not affect the pullout resistance. Moreover, the influence of increasing the number of load cycles from 30 to 250 on the peak pullout resistance is negligible. Finally, the effect of increasing the cyclic tensile load amplitude from 20% to 40% on the monotonic pullout resistance can be ignored. The peak apparent coefficient of friction mobilized at the soil-PS interface under monotonic and cyclic load conditions decreases with the increase in vertical effective stress.

关键词： Geosynthetics Post-cyclic pullout behavior Interface apparent coefficient of friction Multistage pullout (MSP) test

Thermal conductivity modeling of water containing metal oxide nanoparticles

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Journal of Central South university 2015年第3期22卷 1141-1145页

作者： Ahmad Azari persian gulf university Faculty of Oil Gas and Petrochemical EngineeringChemical Engineering Department

The nano particles have demonstrated great potential to improve the heat transfer characteristics of heat transfer *** parameters responsible for this increase were studied. The heat transfer profile in the nanolayer region was combined with other parameters such as volume fraction, particle radius thermal conductivity of the fluid, particle and nanolayer, to formulate a thermal conductivity model. Results predicting the thermal conductivity of nanofluids using the model were compared with experimental results as well as studies by other researchers. The comparison of the results obtained for the Cu O/water and Ti O2/water nanofluids studied shows that the correlation proposed is in closest proximity in predicting the experimental results for the thermal conductivity of a nanofluid. Also, a parametric study was performed to understand how a number of factors affect the thermal conductivity of nanofluids using the developed correlation.

关键词： nanofluid effective thermal conductivity nanoparticle nanolayer modeling

硅胶键合N-丙基哌嗪n-丙酸钠作为可循环使用催化剂催化4H-吡喃衍生物合成(英文)

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催化学报 2013年第12期34卷 2245-2254页

作者： Khodabakhsh Niknam Nassim Borazjani Reza Rashidian Abbas Jamali Department of Chemistry Faculty of Sciences Persian Gulf University Presian Gulf Reaserch and Studies Center Persian Gulf University

Silica‐bonded N‐propylpiperazine sodium n‐propionate(SBPPSP) was found to act as an efficient solid base for the preparation of a series of 4H‐benzo[b]pyran derivatives. SBPPSP was used as a recyclable heterogeneous solid base catalyst for the synthesis of 3,4‐dihydropyrano[c]chromenes, 2‐amino‐4H‐pyrans, 1,4‐dihydropyrano[2,3‐c]pyrazoles, and 2‐amino‐4H‐benzo[e]‐chromenes via the condensation reaction of dimedone, ethyl acetoacetate, 3‐methyl‐1‐phenyl‐1H‐pyrazol‐5(4H)‐ one, and α‐naphthol, respectively, with aromatic aldehydes and malononitrile in refluxing aqueous ethanol. The heterogeneous solid base showed similar efficiency when reused in consecutive reactions.

关键词： Silica‐bonded n‐propylpiperazine sodium n‐propionate Heterogeneous solid base catalyst Aldehyde 4H‐Pyran derivative Malononitrile

One-pot,direct synthesis of acyl azides from carboxylic acids using Ph_2PCl/I_2/NaN_3 reagent system

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Chinese Chemical Letters 2012年第4期23卷 442-445页

作者： Najmeh Nowrouzi Mohammad Zareh Jonaghani Department of Chemistry Faculty of SciencesPersian Gulf UniversityBushehr 75169Iran

A mild,efficient and simple method for the preparation of acyl azides from carboxylic acids using chlorodiphenylphosphine in the presence of molecular iodine and sodium azide is described.

关键词： Chlorodiphenylphosphine Iodine Acyl azides Carboxylic acids Sodium azide

Investigation of the characteristics of particulate flows through fibrous filters using the lattice Boltzmann method

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Particuology 2015年第4期13卷 90-98页

作者： Marzie Babaie Rabiee Shahram Talebi Omid Abouali Ehsan Izadpanah Department of Mechanical Engineering Yazd University Department of Mechanical Engineering Shiraz University Department of Mechanical Engineering Persian Gulf University

A fibrous filter is one of the most common systems used to separate suspended particles from air. Two important factors （i,e,, the pressure drop and capture efficiency） are usually used to evaluate the performance of this type of filter, This study considers three two-dimensional arrangements of fibers （parallel, staggered, and random） to geometrically model fibrous media, The lattice Boltzmann method is employed to numerically simulate fluid flow through the filter, The Lagrangian form of the equation of motion of a particle is numerically solved to track the path of each particle in the flow field, where a one-way interaction between the fluid and particles is considered. The effects of pertinent parameters such as the fiber arrangement, solid volume fraction, particle-to-fiber diameter ratio, particle-to-fluid density ratio, Reynolds number, Stokes number, and size of the fibrous medium on the pressure drop and capture efficiency are studied. The obtained results are compared with existing empirical and theoretical findings and discussed.

关键词： Fibrous filter Pressure drop factor Capture efficiency Lattice Boltzmann method Random geometry Ordered geometry

Epidemiology of hepatitis E virus in Iran

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World Journal of Gastroenterology 2016年第22期22卷 5143-5153页

作者： Reza Taherkhani Fatemeh Farshadpour Department of Microbiology and Parasitology School of Medicine Bushehr University of Medical Sciences persian gulf Biomedical Research Center Bushehr University of Medical Sciences persian gulf Tropical Medicine Research Center Bushehr University of Medical Sciences

Iran is known as an endemic country for hepatitis E virus(HEV) infection, while there are variations in the epidemiology of HEV infection throughout the country. The available epidemiological studies in different regions of Iran show HEV seroprevalence of 1.1%-14.2% among general population, 4.5%-14.3% among blood donors, 6.1%-22.8% among injecting drug users, 6.3%-28.3% among hemodialysis patients, 1.6%-11.3% among patients infected with other hepatitis viruses, 27.5% among patients with chronic liver disease, 30.8% among kidney transplant recipient patients, and 10%-16.4% among human immunodeficiency virus-infected patients. These variations reflect differences in the status of public health and hygiene, risk factors, and routes of transmission in different regions and groups. Therefore, it is necessary to review the epidemiology of HEV infection to determine the most prevalent risk factors and routes of transmission, and to evaluate the effectiveness of preventive strategies employed in the public health services of the country. Moreover, the other epidemiological aspects of HEV, including the genotypic pattern, extra hepatic manifestations, and incidence of chronic infection need to be investigated among Iranian population to expand the current knowledge on the epidemiology of HEV and to clarify the real burden of HEV infection. Therefore, this review was performed to provide a general overview regarding the epidemiology of HEV in Iran.

关键词： Hepatitis E virus General population Blood donors Injecting drug users Hemodialysis Immunocompromised patients Chronic liver disease Prevalence Epidemiology Iran

Chemical identification,antioxidant,cholinesterase inhibitory,and cytotoxic properties of fucoidan extracted from persian gulf Sargassumangustifolium

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Acta Oceanologica Sinica 2022年第12期41卷 133-141页

作者： Arghavan Hosseinpouri Mehdi Mohammadi Elham Ehsandoost Paria Sharafi-Badr Narges Obeidi Department of Cellular and Molecular Sciences Faculty of SciencesPersian Gulf UniversityBushehr 75168Iran Department of Marine Biotechnology Persian Gulf InstitutePersian Gulf UniversityBushehr 75168Iran Department of Biotechnology Persian Gulf Algae Development TechnologyDelvar Industrial Zone No.55Bushehr 75168Iran Department of Food Science and Technology Shiraz UniversityShiraz 71441-65186Iran Department of Pharmacognosy and Pharmaceutical Biotechnology School of PharmacyIran University of Medical SciencesTehran 14496-14535Iran Department of Hematology Faculty of ParamedicineBushehr University of Medical SciencesBushehr 75146-33341Iran

Marine macroalgal sulfated fucose-containing polysaccharides,like fucoidan,have drawn significant attention due to their biotechnological potentials,such as anti-cancer,antioxidant,and anti-cholinesterase *** fucoidan derived from brown macroalgae Sargassum angustifolium species(FSA)was investigated for its cytotoxic effects and alterations in cell proliferation,and cell cycle-related gene expression in the present study occurred on NB4 cell *** results showed that FSA would induce p53,p21,pro-apoptotic genes and increase expression of the p15 gene as a cell arrest ***,FSA inhibited the anti-apoptotic effect of the Bcl-2 gene and decreased dnmt-1 gene *** significantly exhibited potent 2,2-diphenyl-1-picrylhydrazyl(DPPH)radical scavenging activity(p<0.05)with an IC_(50) value of 0.157 mg/mL and showed moderate anti-acetylcholinesterase activity with an IC_(50) value of 1.20μg/*** results indicated the potential of FSA for the development of therapeutic or preventive agents of cancer and Alzheimer’s disease mainly through cytotoxic effect and AChE(acetylcholinesterase)inhibition as well as additional antioxidant capacities.

关键词： fucoidan Sargassum angustifolium cytotoxicity antioxidant anti-cholinesterase