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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Nutrition,Fasting and Health
- نوع مقاله: Journal Article
- کلمات کلیدی: Protein,Macronutrients,micronutrients,Carbohydrate,Fat,fasting
- چکیده:
- چکیده انگلیسی: Introduction: The study was aimed to assess the intakes of nutrients of individuals in month of Ramadan. Materials and Methods: In total, 119 participants visited twice: once before Ramadan and then the 3rd week of Ramadan. A food frequency questionnaire (FFQ) and 3-day food intake recall used to determine the nutrient intake during Ramadan and other months. Weight, height and other demographic parameters were also gathered. Results: One sample T-test showed a significantly higher intake of Calorie, total fat, saturated fatty acids, cholesterol, vitamin A carotene, vitamin A total, vitamin B2, B12, C, niacin and phosphorous were significantly higher than RDA before Ramadan (P<0.05). However, Carbohydrate, fiber, polyunsaturated fat, folate, cooper, magnesium, potassium, selenium and sodium of subjects’ diets were significantly lower than RDA before Ramdan. paired sample T-test illustrated that Calories, carbohydrate, fiber, total fat, monounsaturated fatty acids, saturated fatty acids, cholesterol, vitamin A carotene, total vitamin A, vitamin B1, C, E, folate, calcium, iron, magnesium, phosphorous, potassium, selenium and sodium intake all significantly decreased after 3 weeks of fasting. However, only Calories, protein, carbohydrate, fiber, total fat, saturated fat, monounsaturated fat, polyunsaturated fat, cholesterol, vitamin A carotene, vitamin B2, B6, C, E, folacin, calcium, copper, iron, magnesium, phosphorous, potassium, selenium and sodium intake in 3rd week of Ramadan were significantly lower than RDA and vitamin A and niacin were significantly higher than RDA during Ramadan. Conclusion: The present study demonstrates a significant decrease in some micronutrients during the month of Ramadan and indicates to imply nutritional recommendation in selecting foods.
- انتشار مقاله: 17-09-1397
- نویسندگان: Seyedeh Forogh Sajjadi,Kosar Hassanpour,Majid Assadi,Farzaneh Yousefi,Afshin Ostovar,Iraj Nabipour,Alireza Rahbar
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Immunology
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی:
- انتشار مقاله: 15-05-1395
- نویسندگان: Shokrollah Farrokhi,Iraj Nabapour,Majid Assadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Basic Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Electrospun nanofiber In vitro Mouse N,acetylcysteine (NAC) Oxidative stress Wound
- چکیده:
- چکیده انگلیسی: Objective(s): N-acetylcysteine (NAC) has gained attention recently in dermatology as a unique anti-oxidant. In light of progress in nanotechnological methods, it was hypothesized that loading NAC onto nanofibers would positively affect skin wound healing. The objective of this study was to fabricate NAC-loaded electrospun mats and test their effect on wound healing in vivo and in vitro.
Materials and Methods: Polyvinyl alcohol (PVA)-based mats loaded with NAC at three concentrations were electrospun and characterized in terms of physicochemical properties and drug release profile. Human fibroblast cells (in vitro) and mouse full-thickness skin wounds (in vivo) were treated with mats for 5 and 14 days, respectively. Wound area, tissue histopathology, fibroblast proliferation and cellular oxidative state were evaluated.
Results: Mats containing 5% PVA/NAC showed thinner fibers with suitable physicochemical properties and a sustained drug release profile. PVA/NAC (5%) mats enhanced fibroblast proliferation and attachment in vitro. The mats resulted in significant wound closure with high levels of re-epithelialization and collagen fiber synthesis on day 14 post-surgery in vivo. The mats also reduced granulation tissue and edematous stroma to a higher extent. These findings were accompanied by a significant decrease in tissue lipid peroxidation and higher superoxide dismutase activity, which may explain how NAC improved wound healing.
Conclusion: We propose an NAC-loaded nanofibrous mat that takes the advantage of a porous nanoscaffold structure to release NAC in a sustained manner. This mat may be a promising candidate for further clinical evaluation.- انتشار مقاله: 06-02-1399
- نویسندگان: Ramin Seyedian,Elham Shabankareh Fard,Maryam Najafiasl,Majid Assadi,Sasan Zaeri
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Basic Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Electrospun nanofiber In vitro Mouse N,acetylcysteine (NAC) Oxidative stress Wound
- چکیده:
- چکیده انگلیسی: Objective(s): N-acetylcysteine (NAC) has gained attention recently in dermatology as a unique anti-oxidant. In light of progress in nanotechnological methods, it was hypothesized that loading NAC onto nanofibers would positively affect skin wound healing. The objective of this study was to fabricate NAC-loaded electrospun mats and test their effect on wound healing in vivo and in vitro.
Materials and Methods: Polyvinyl alcohol (PVA)-based mats loaded with NAC at three concentrations were electrospun and characterized in terms of physicochemical properties and drug release profile. Human fibroblast cells (in vitro) and mouse full-thickness skin wounds (in vivo) were treated with mats for 5 and 14 days, respectively. Wound area, tissue histopathology, fibroblast proliferation and cellular oxidative state were evaluated.
Results: Mats containing 5% PVA/NAC showed thinner fibers with suitable physicochemical properties and a sustained drug release profile. PVA/NAC (5%) mats enhanced fibroblast proliferation and attachment in vitro. The mats resulted in significant wound closure with high levels of re-epithelialization and collagen fiber synthesis on day 14 post-surgery in vivo. The mats also reduced granulation tissue and edematous stroma to a higher extent. These findings were accompanied by a significant decrease in tissue lipid peroxidation and higher superoxide dismutase activity, which may explain how NAC improved wound healing.
Conclusion: We propose an NAC-loaded nanofibrous mat that takes the advantage of a porous nanoscaffold structure to release NAC in a sustained manner. This mat may be a promising candidate for further clinical evaluation.- انتشار مقاله: 06-02-1399
- نویسندگان: Ramin Seyedian,Elham Shabankareh Fard,Maryam Najafiasl,Majid Assadi,Sasan Zaeri
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: Permeability,Tortuosity,GDL Reconstruction,Fiber Orientation,Pore Size Distribution
- چکیده:
- چکیده انگلیسی: A 3D microstructure of the non-woven gas diffusion layers (GDLs) of polymer electrolyte fuel cells (PEFCs) is reconstructed using a stochastic method. For a commercial GDL, due to the planar orientation of the fibers in the GDL, 2D SEM image of the GDL surface is used to estimate the orientation of the carbon fibers in the domain. Two more microstructures with different fiber orientations are generated and compared. The method is verified by comparing the commercial GDL (Toray TGP-H-060) model properties with other simulations or real GDL data. Three different reconstructed models are compared in terms of permeability, and the 3D pore size distribution of the models is also investigated. Through-plane (TP) and in-plane (IP) tortuosity, and the effects of binder addition on tortuosity are also discussed. For the TGH-H-060, tortuosity is derived to be 0.93, 1.50, and 1.42 in IP-x, IP-y, and TP-z directions, respectively. It is shown that adding binders to the fibrous skeleton increases the tortuosity of the pore phase.
- انتشار مقاله: 17-06-1396
- نویسندگان: Sepehr Sima Afrookhteh,Jalil Jamali,Mohsen Shakeri,Majid Baniassadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: Backbone Anisotropy,Infiltrated Electrode,Realization of Microstructure,Solid Oxide Fuel Cells
- چکیده:
- چکیده انگلیسی: Design of optimal microstructures for infiltrated solid oxide fuel cell (SOFC) electrodes is a complicated process because of the multitude of the electrochemical and physical phenomena taking place in the electrodes in different temperatures, current densities and reactant flow rates. In this study, a stochastic geometric modeling method is used to create a range of digitally realized infiltrated SOFC electrode microstructures to extract their geometry-related electrochemical and physical properties. Triple Phase Boundary (TPB), active surface density of particles along with the gas transport factor is evaluated in those realized models to adapt for various infiltration strategies. Recently, additive manufacturing or freeze type casting methods enable researchers to investigate the performance of directional electrodes to get the maximum electrochemical reaction sites, gas diffusivity and ionic conductivity simultaneously. A series of directional backbones with different amount of virtually deposited electrocatalyst particles are characterized in the first step. The database of microstructural parameters (inputs) and effective geometric properties (outputs) is used to train a range neural network. A microstructure property hull is created using the best neural network model to discover the range of effective properties, their relative behaviour and optimum microstructure. The characteristics of models is shown that there is not any contradiction between the high level of TPB and contact surface density of particles, but the highest amount of gas diffusivity can be found in the microstructures with lower level of reaction sites. Also increasing the contact surface density has a negative effect on gas transport but the high level of TPB density is feasible in the full range of microstructures. In the other hand, TPB density and gas diffusion into the models are inversely related, although there are a limited number of microstructures with high level of reaction sites and acceptable gas diffusivity. Finally, using a simple optimization process, the microstructures with the highest level of reaction sites and gas transport factor are identified which have the backbone porosity of about 50%, and extremely higher gain growth rate normal to the electrolyte. Additive manufacturing and 3D printing methods will enhance researchers in the future to create the real directional electrodes on the base of these proposed models.
- انتشار مقاله: 26-11-1395
- نویسندگان: Mehdi Tafazoli,Mohsen Shakeri,Majid Baniassadi,Alireza Babaei
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: Active Triple Phase Boundary Length,Anode,Active Cluster,Solid oxide fuel cell,Tortuosity
- چکیده:
- چکیده انگلیسی: An efficient procedure is presented for the evaluation of solid oxide fuel cell (SOFC) anode microstructure triple phase boundary length (TPBL). Triple phase boundary- the one that is common between three phases of the microstructure- has a great influence on the overall efficiency of SOFC because all electrochemical reactions of anode take place in its vicinity. Therefore, evaluation of TPBL for virtual or experimental 3D microstructures is essential for comparison purposes and the optimization processes. In this study, first, an algorithm is proposed to distinguish between percolated and non-percolated clusters for each of the phases. Then, another algorithm is used to determine the value of TPBL for all percolated clusters of three phases. Also, a procedure based on thermal and diffusion analogy is presented to assess the tortuosity of porous and solid phases. Finally for a virtual microstructure, percolated clusters, active and total TPBL and tortuosity are calculated and discussed.
- انتشار مقاله: 13-11-1394
- نویسندگان: Ali Hasanabadi,Majid Baniassadi,Karen Abrinia,Mostafa Baghani,Mohsen Mazrouei Sebdani
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: Microstructure,Fuel cell,Material Design
- چکیده:
- چکیده انگلیسی: In the present study, the effect of porosity on the cathode microstructure (50:50 wt. % LSM: YSZ) of a Solid Oxide Fuel Cell (SOFC) has been examined. A 3-D finite element method for Mixed Ionic and Electronic Conducting Cathodes (MIEC) is presented to study the effects of porosity on cell performance. Each microstructure was realized using the Monte Carlo approach with the isotropic type of growth rate. The effect of porosity on the cathode of a solid oxide fuel cell involving the Three Phase Boundary Length (TPBL), electric conductivity of LSM phase, ionic conductivity of YSZ, mechanical behavior and tortuosity of the pore phase were explored in the present work. The cathode having a porosity value between 31 and 34% revealed the maximum TPBL value as well as a high variation in the electrical conductivity of the LSM phase. Pore phase tortuosity was also decreased by increasing the porosity factor.
- انتشار مقاله: 13-08-1393
- نویسندگان: Mohammad Riazat,Majid Baniassadi,Mohsen Mazrouie,Mehdi Tafazoli,Mahdi Moghimi Zand
- مشاهده
- جایگاه : پژوهشی
- مجله: Asia Oceania Journal of Nuclear Medicine and Biology
- نوع مقاله: Journal Article
- کلمات کلیدی: COVID-19,new normal,Nuclear Medicine Facilities,Reopening,SARS-CoV-2
- چکیده:
- چکیده انگلیسی: The stormy clouds of the coronavirus disease 2019 outbreak caused a rapidly spreading epidemic still hanging over the sphere. Any steps to transition toward a new normal should be guided by health authorities, together with economic and societal considerations. There are various items mainly falling into three classifications, including patient worry, clinical demand, and economic recession. Social distancing, lay-offs, and decreased number of patients with health insurance may lead to a prolonged period to retrieve normalcy. To return to a new normal, an individualized management model should be developed for each laboratory based on staff, instruments, services, crowding, physical space, hospital base unit, or outpatient clinic. Continuous training of different occupational staffs is among the key parameters in maintaining this readiness. The proposed response model should have internal and systemic integrity as well as coherence among the included items in two intra- and inter-unit management categories, namely thinking globally and acting locally.
- انتشار مقاله: 19-05-1399
- نویسندگان: Farhad Abbasi,Ali Gholamrezanezhad,Narges Jokar,Majid Assadi
- مشاهده