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Er_(2)TiO_(5)@Ag nanocomposites:Enhanced photocatalysis and bacteria inactivation,and cytotoxicity

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Journal of Rare Earths 2024年第5期42卷 851-858,I0002页

作者： Mehdi Nazeri hossein Sedaghat Reza rafiei mohammad Amin Farzin Seyed Mostafa hosseinpour Mashkani Department of Parasitology and Mycology Kashan University of Medical SciencesKashanIran Department of Microbiology Kashan University of Medical SciencesKashanIran General Medicine Student School of MedicineKashan University of Medical SciencesKashanIran Student Research Committee Kashan University of Medical SciencesKashanIran Institute for Biomedical Materials and Devices School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneyNSW2007Australia

In this study,we successfully synthesized Er_(2)TiO_(5)@Ag nanocomposites(NCPs) using the ultrasonicmediated sol-gel technique to create a multifunctional material with enhanced photocatalytic and antibacterial *** visible light photocatalytic activities of Er_(2)TiO_(5) nanoparticles(NPs) and Er_(2)TiO_(5)@Ag NCPs were systematically evaluated under various conditions,including different concentrations of Basic Blue 41(BB 41) dye and *** results reveal a remarkable improvement in the photocatalytic degradation efficiency of Er_(2)TiO_(5)@Ag NCPs(95%) compared to Er_(2)TiO_(5) NPs(80%).Furthermore,the antibacterial efficacy of Er_(2)TiO_(5) NPs and Er2TiO_5@Ag NCPs were extensively examined against Gram-positive and Gram-negative ***,Er_(2)TiO_(5)@Ag NCPs exhibit significantly higher minimum bactericidal concentration(MBC) values compared to Er_(2)TiO_(5) *** antibacterial effect of Er_(2)TiO_(5)@Ag NCPs is particularly pronounced against *** and Pseudomonas aeruginosa,while demonstrating moderate effects on Escherichia coli and Enterococcus *** assess the biocompatibility of the synthesized materials,we investigated their internalization by MCF-7 ***,both Er_(2)TiO_(5) NPs and Er_(2)TiO_(5)@Ag NCPs are found to be effectively internalized by the cells,suggesting their potential application in biomedical ***,our study unveils the exceptional potential of Er_(2)TiO_(5)@Ag NCPs as a dual-action solution,simultaneously possessing enhanced photocatalytic efficiency and potent antibacterial *** multifunctional nanocomposite not only outperforms Er_(2)TiO_(5) and Ag but also paves the way for innovative applications in sustainable environmental remediation and advanced biomedical technologies,promising a brighter and cleaner future.

关键词： Rare earth catalysis Nanocomposite Er_(2)TiO_(5)@Ag Antibacterial activity Photocatalysis Cytotoxicity

Cytotoxic effect of methanolic extracts of Fritillaria imperialis bulbs and Eryngium caucasicum leaves on hepatoma and colon cancer cells

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Asian Pacific Journal of Tropical Biomedicine 2019年第8期9卷 353-358页

作者： Mostafa Kardan Zahra Yazdani Zaher Morsaljahan mohammad Ali Ebrahimzadeh Alireza rafiei Student Research Committee Department of ImmunologyMolecular and cell Biology Research CenterSchool of MedicineMazandaran University of Medical SciencesSariIran Department of Immunology School of MedicineMazandaran University of Medical SciencesSariIran Pharmaceutical Sciences Research Center Department of Medicinal ChemistryFaculty of PharmacyMazandaran University of Medical SciencesSariIran

Objective: To evaluate antitumor activities of Fritillaria imperialis and Eryngium caucasicum methanolic extracts on human hepatoma (hepG2) and colon cancer (hCT116) cell lines in comparison to human foreskin fibroblasts as the normal cells. Methods: Methanolic extracts of Fritillaria imperialis and Eryngium caucasicum were prepared by the maceration method. The effect of the extracts at various concentrations (100, 200, 400, 600, and 800 μg/mL) on cell survival was evaluated using the MTT method. Besides, fluorescence staining was used to evaluate death patterns of the cells. Results: MTT assay showed that Fritillaria imperialis significantly decreased the viability of all cell lines after 24 and 48 hours of treatments. however, Eryngium caucasicum extract did not show any significant cytotoxicity effect on the cell lines. Fluorescence staining revealed that Fritillaria imperialis induced apoptosis of hCT116 cells at 550 μg/mL. Conclusions: Fritillaria imperialis extract has antiproliferative and cytotoxic effects on hCT116 and hepG2 cancer cells and therefore, may serve as an anticancer agent.

关键词： Fritillaria imperialis Eryngium caucasicum Cytotoxity Colon cancer hepatoma cancer

Efficacy of combined albendazol and praziquntel and their loaded solid lipid nanoparticles components in chemoprophylaxis of experimental hydatidosis

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Asian Pacific Journal of Tropical Biomedicine 2017年第6期7卷 549-554页

作者： Ali Jelowdar Abdollah.rafiei mohammad Reza Abbaspour Iran Rashidi Mahmood Rahdar Department of Parasitology School of MedicineAhvaz Jundishapur University of Medical Sciences health Research Institute Infectious and Tropical Diseases Research CenterFaculty of MedicineAhvaz Jundishapur University of Medical Sciences Targeted Drug Delivery Research Center School of PharmacyMashhad University of Medical Sciences Department of Pathology School of MedicineAhvaz Jundishapur University of Medical Sciences

Objective:To evaluate the efficacy of combined ABZ and PZQ and their solid lipid nanoparticles in chemoprophylaxis of cystic echinococcosis(CE).Methods:ABZ and PZQ loaded solid lipid nanoparticles(SLNs) were prepared by high shear homogenization and microemulsion congealing techniques with some minor *** average size,polydispersity index(PDI),and particle size distribution were determined by scanning electron microscopy(SEM) and photon correlation *** females BALB/c were experimentally infected by protoscoleces(PSC) and randomly divided into four equal groups of 10 *** the end of the 3 months treatment period and 2 months rest,mice were sacrificed and the peritoneal cavity was opened for removal,counting,measuring,and histological analysis of hydatid ***:The results indicated that ABZ and PZQ chemoprophylaxis treatment reduced the wet weight and size of developed cysts 77.3% and 79%,*** corresponding result for the ABZ and PZQ loaded SLNs was 83% and 85%,***:This study for the first time demonstrated that ABZ and PZQ loaded SLNs is superior to free ABZ and PZQ for the chemoprophylaxis of CE in mice.

关键词： Echinococcosis Albendazole Praziquantel high pressure homogenization Solid lipid nanoparticles(SLNs)

Factor of safety of strain-softening slopes

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 473-483页

作者： hossein rafiei Renani C.Derek Martin Klohn Crippen Berger Ltd. VancouverCanada Department of Civil and Environmental Engineering University of AlbertaEdmontonCanada

Stability analysis of strain-softening slopes is carried out using the shear strength reduction method and Mohr-Coulomb model with degrading cohesion and friction *** e ffect of strain-softening behavior on the slope factor of safety is investigated by performing a series of analyses for various slope geometries and strength *** charts and equations are developed to estimate the factor of safety of strain-softe ning slopes from the results of traditional stability analysis based on perfectly-plastic *** example applications including an open pit mine in weak rock and clay shale slope with daylighting bedding planes are *** results of limit equilibrium analysis and shear strength reduction method with perfectly-plastic models were in close *** perfectly-plastic models with peak strength properties led to overly optimistic results while adopting residual strength properties gave excessively conservative *** shear strength reduction method with a strain-softening model gave realistic factors of safety while accounting for the process of strength degradation.

关键词： Slope stability analysis Factor of safety ratio Shear strength reduction Perfectly-plastic behavior Open pit slope Clay shale slope

Status of intestinal parasitic infections among rural and urban populations, southwestern Iran

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Asian Pacific Journal of Tropical Medicine 2019年第3期12卷 130-136页

作者： Molouk Beiromv Esmat Panabad Abdollah.rafiei Infectious and Tropical Diseases Research Center Health Research Institute Ahvaz Jundishapur University of Medical Sciences Department of Parasitology School of Medicine Ahvaz Jundishapur University of Medical Sciences

Objective: To evaluate the prevalence and risk factors of intestinal parasitic infections in the urban and rural areas of Shushtar County,southwest ***: A total of 1 008 fecal samples were analyzed by direct smear examination,formalinether concentration,and Ziehl-Neelsen and trichrome staining; furthermore,PCR was used to distinguish Trichostrongylus and hookworm species based on 28 S rRNA ***: Totally,16.0% cases tested positive,either with a pathogenic or a non-pathogenic parasite. Protozoa were detected in 14.0%,helminths in 1.0%,protozoa and helminth coinfections were detected in 0.3%,and co-infections of two protozoa were detected in 0.7% of cases. The most common protozoa and helminths were Giardia duodenalis(7.7%) and Trichostrongylus spp.(0.5%),respectively. Among five microscopy Trichostrongylus positive cases,Trichostrongylus culbriformis was successfully identified in three isolates by sequencing. In the rural areas,the prevalence of parasitic infection was higher(9.8%) than that in the urban areas(6.2%). A significant association was found between educational level,type of drinking water,animals contact,hand-washing,and clinical symptoms. Conclusions: This study indicates that intestinal parasitic infections remain as a public health priority in Shushtar County. It seems that drinking water and environmental sanitation are the main risk factors of parasitic infections in rural areas.

关键词： Intestinal parasitic infections Risk factors Iran

Synthesis of a NiTi_(2)–AlNi–Al_(2)O_(3) nanocomposite by mechanical alloying and heat treatment of Al–TiO_(2)–NiO

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 345-349页

作者： Reza Beygi Majid Zarezadeh Mehrizi hossein Mostaan Mahdi rafiei Ahmadreza Abbasian Department of Materials Engineering and Metallurgy Faculty of Engineering Arak University Advanced Materials Research Center Department of Materials Engineering Najafabad Branch Islamic Azad University Department of Materials Engineering Faculty of Engineering University of Sistan and Baluchestan

The aim of the present study was to investigate the phases formed during ball milling of Al–TiO_2–NiO. For this purpose, a mixture of Al–TiO_2–NiO with a molar ratio of 6:1:1 was used. Characterization of the milled powders by X-ray diffraction, differential thermal analysis, field-emission scanning electron microscopy, and transmission electron microscopy showed the formation of nanocrystalline NiTi_2 along with AlNi. A thermodynamical investigation confirmed that NiO was reduced by Al during ball milling, which consequently promoted TiO_2 reduction and the formation of NiTi_2. Al is capable of reducing NiO either during ball milling or at temperatures above the melting point of Al; by contrast, TiO_2 can be reduced by Al only by milling.

关键词： mechanical alloying NiTi_(2)-AlNi nanocomposite reaction mechanism

Characteristic Assessment of Stabilized Polyacrylonitrile Nanowebs for the Production of Activated Carbon Nano-Sorbents

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Chinese Journal of Polymer Science 2014年第4期32卷 449-457页

作者： S.rafiei B.Noroozi Sh.Arbab A.K.haghi Department of Textile Engineering University of Guilan

Polyacrylonitrile （PAN） nanofibers with average diameter of 300 nm were produced by electro-spinning. The nanofibers were stabilized at different temperatures in the range of 180-270 ℃in several duration times and heating rates. Fourier transforms infrared （FTIR） spectroscopy, differential scanning calorimetry （DSC） and X-ray diffraction （XRD） analyzing techniques were employed to measure the extent of stabilization reaction. By all procedures, the ranges of temperature and duration time recommended were about 250-270 ℃ and 1-2 h, respectively. Increasing the activation temperature from 800 ℃ to 1200 ℃ caused porosity and pore volume development up to 60% and 0.532 cm3/g, respectively. Pore width of all samples was calculated to be about 0.7 nm confirming micro-pore structure of the produced PAN based activated carbon nanofibers. Comparing dye adsorption for different adsorbents including chitin and granular activated carbon （GAC） showed the highest efficiency for the produced activated carbon nanofibers （ACNFs）.

关键词： Polyacrylonitrile Electro-spinning Stabilization Activated carbon nanofibers Adsorbent.

A dynamic credit risk assessment model with data mining techniques:evidence from Iranian banks

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Financial Innovation 2019年第1期5卷 240-266页

作者： Somayeh Moradi Farimah Mokhatab rafiei Science and Research Branch Islamic Azad UniversityTehranIran Tarbiat Modares University TehranIran

Giving loans and issuing credit cards are two of the main concerns of banks in that they include the risks of *** to the Basel 2 guidelines,banks need to develop their own credit risk assessment *** banks have such systems;nevertheless they have lost a large amount of money simply because the models they used failed to accurately predict customers’***,banks have used static models with demographic or static factors to model credit risk ***,economic factors are not independent of political fluctuations,and as the political environment changes,the economic environment evolves with *** has been especially evident in Iran after the 2008-2016 USA sanctions,as many previously reliable customers became unable to repay their debt(i.e.,became bad customers).Nevertheless,a dynamic model that can accommodate fluctuating politicoeconomic factors has never been *** this paper,we propose a model that can accommodate factors associated with politico-economic *** judgement is removed from the customer evaluation *** used a fuzzy inference system to create a rule base using a set of uncertainty ***,we train an adaptive network-based fuzzy inference system(ANFIS)using monthly data from a customer profile ***,using the newly defined factors and their underlying rules,a second round of assessment begins in a fuzzy inference ***,we present a model that is both more flexible to politico-economic factors and can yield results that are max compatible with real-life *** between the prediction made by proposed model and a real non-performing loan indicates little difference between *** risk specialists also approve the *** major innovation of this research is producing a table of bad customers on a monthly basis and creating a dynamic model based on the *** latest created model is used for assessing customers henceforth,so the whole pro

关键词： Fuzzy clustering Non-performing loan Credit risk FIS Dynamism ANFIS

Uncertainty analysis of hydrological modeling in a tropicalarea using different algorithms

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Frontiers of Earth Science 2018年第4期12卷 661-671页

作者： Ammar rafiei EMAM Martin KAPPAS Steven FASSNAChT Nguyen hoang Khanh LINh Department of Cartography GIS and Remote SensingUniversity of Goettingen37077GoettingenGermany Colorado State University Fort CollinsCO 80523-1476USA Faculty of Land Resources and Agricultural Environment (FLRAE) Flue University of Agriculture and Forestry (F1UAF)Hue UniversityHue City 0084Vietnam

hydrological modeling outputs are subject to uncertainty resulting from different sources of errors (e.g., error in input data, model structure, and model parameters), making quantification of uncertainty in hydrological modeling imperative and meant to improve reliability of modeling results. The uncertainty analysis must solve difficulties in calibration of hydrological models, which further increase in areas with data scarcity. The purpose of this study is to apply four uncertainty analysis algorithms to a semi-distributed hydrological model, quantifying different source of uncertainties (especially parameter uncertainty) and evaluate their performance. In this study, the Soil and Water Assessment Tools (SWAT) eco-hydrological model was implemented for the watershed in the center of Vietnam. The sensitivity of parameters was analyzed, and the model was calibrated. The uncertainty analysis for the hydrological model was conducted based on four algorithms: Generalized Likelihood Uncertainty Estimation (GLUE), Sequential Uncertainty Fitting (SUFI), Parameter Solution method (ParaSol) and Particle Swarm Optimization (PSO). The performance of the algorithms was compared using P-factor and Rfactor, coefficient of determination (R2), the Nash Sutcliffe coefficient of efficiency (NSE) and Percent Bias (PBIAS). The results showed the high performance of SUFI and PSO with P-factor>0.83, R-factor 0.91, NSE>0.89, and 0.18hence, we would suggest to use SUFI-2 initially to set the parameter ranges, and further use PSO for final analysis. Indeed, the uncertainty analysis must be accounted when the outcomes of the model use for policy or management decisions.

关键词： SWAT-CUP GLUE SUFI2 ParaSol PSO Vietnam