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Yousef S, Tonkonogovas A, Makarevicius V, Mohamed A. Enhanced gas separation performance for H 2 purification using MIL-68(ln)-nh 2/PES mixed-matrix membranes. Chemosphere 2024; 358:142166. [PMID: 38685331 DOI: 10.1016/j.chemosphere.2024.142166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 04/19/2024] [Accepted: 04/25/2024] [Indexed: 05/02/2024]
Abstract
The growing demand for sustainable and efficient gas separation technologies has prompted the exploration of advanced materials to enhance the gas permeability and selectivity. Polyethersulfone (PES) membranes are widely used in gas separation, gas upgrading, and clean energy production owing to their environmental friendliness and low cost. However, their gas permeability and selectivity can be further improved for commercial application. This study explored the incorporation of 10 wt % of MIL-68(ln)-NH2 into PES membranes using a phase-inversion approach to enhance gas permeability and selectivity. The morphological, structural, and thermal properties of the resulting MOF/PES membrane were characterized using SEM, AFM, BET, XRD, FTIR, and TGA-DTG. Gas permeation experiments were conducted using different gases (CO2, N2, CH4, and H2) under different heating conditions (20-60 °C) to evaluate the gas permeability and selectivity of the MOF/PES membrane. The results showed that the incorporation of MOF into the mixed matrix membrane (MMMs) led to a 9% increase in porosity, 87% reduction in roughness, and 32% decrease in pore size compared to neat PES membranes. Significant changes in the morphology, crystallinity, and thermal stability were observed, with notable improvements of up to 22%. Moreover, the MOF/PES membrane exhibited high gas permeability (CO2 = 124656, N2 = 83650, CH4 = 159298, and H2 = 427075 Barrer) and selectivity (H2/N2 = 5.7, H2/CO2 = 4, CH4/N2 = 2, and CH4/CO2 = 1.7) for flammable gases. The optimal gas separation performance was observed at 20 °C and 60 °C for H2/N2 and H2/CO2 separation, respectively. These findings demonstrate the potential of MOF-based PES membranes for gas separation applications, particularly in H2 purification.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania
| | - Andrius Tonkonogovas
- Lithuanian Energy Institute, Laboratory of Heat Equipment Research and Testing, Breslaujos 3, LT 44403, Kaunas, Lithuania
| | - Vidas Makarevicius
- Laboratory of Materials Research and Testing, Lithuanian Energy Institute, Breslaujos st. 3, 44403 Kaunas, Lithuania
| | - Alaa Mohamed
- Section of Chemical Science and Engineering, Department of Chemistry and Bioscience, Aalborg University, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark.
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Yousef S, Eimontas J, Stasiulaitiene I, Zakarauskas K, Striūgas N. Recovery of energy and carbon fibre from wind turbine blades waste (carbon fibre/unsaturated polyester resin) using pyrolysis process and its life-cycle assessment. Environ Res 2024; 245:118016. [PMID: 38154563 DOI: 10.1016/j.envres.2023.118016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/16/2023] [Accepted: 12/21/2023] [Indexed: 12/30/2023]
Abstract
Recovery of carbon fibres and resin from wind turbine blade waste (WTB) composed of carbon fibres (CF)-reinforced unsaturated polyester resin (UPR) has been environmentally challenging due to its complex structure that is not biodegradable and that is rich in highly toxic styrene (main component of UPR). Within this framework, this paper aims to liberate CF and UPR from WTB using a pyrolysis process. The treatment was performed on commercial WTB (CF/UPR) up to 600 °C using a 250 g reactor. The UPR fraction was decomposed into liquid and gaseous phases, while CF remained as a residue. The composition of gaseous phase was monitored during the entire treatment using a digital gas analyser, while gas chromatography-mass spectrometry (GC-MS) was used to characterize the collected liquid phase. CF fraction was collected and exposed to additional oxidation process after treatment at 450 °C for purification propose, then it was analysed using FTIR and SEM-EDX. Finally, the life cycle assessment (LCA) of the CF/UPR pyrolysis was studied using SimaPro software and the results were compared with landfill disposal practices. The pyrolysis results manifested that 500 °C was sufficient for UPR decomposition into styrene-rich oil and gaseous products with yields of 15.23 wt% and 6.83 wt%, respectively, accompanied by 77.93 wt% solid residue including CF. The LCA results showed that pyrolysis with oxidation process has high environmental potential in WTB recycling with significant reduction in several impact categories compared to landfill. However, the pyrolysis scenario revealed several additional environmental burdens related to ecosystems, acidification, Ozone formation, and fine particulate matter formation that must be overcome before upscaling.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania.
| | - Justas Eimontas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania.
| | - Inga Stasiulaitiene
- Department of Environmental Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-50254 Kaunas, Lithuania
| | - Kęstutis Zakarauskas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Nerijus Striūgas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania
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Yousef S, Tonkonogovas A, Mohamed A. Graphene-modified MIL-125-NH 2 mixed matrix membranes for efficient H 2 and CH 4 purification. Chemosphere 2024; 352:141362. [PMID: 38309606 DOI: 10.1016/j.chemosphere.2024.141362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/31/2024] [Accepted: 02/01/2024] [Indexed: 02/05/2024]
Abstract
This study investigates the performance of the mixed matrix membranes (MMMs) incorporating hybrid fillers of metal-organic framework (MIL-125-NH2) and graphene nanosheets (GNs) for enhanced methane (CH₄) and hydrogen (H₂) separation in the purification sector. The physico-chemical properties of the MMMs were evaluated by SEM, XRD, FTIR, AFM, TGA, DTG, and Brunauer-Emmett-Teller. The permeability and selectivity of the MMMs were determined using different single gases (CO2, N2, H2, and CH4) at various temperatures (20-60 °C). Optimization of fabrication parameters resulted in a significant improvement in porosity and roughness of the fabricated MMMs. The permeabilities of the MOF/PES membrane are 20.3 (CO2), 23.9 (N2), 32.2 (CH4), and 24.1 (H2) x 104 Barrer, while incorporating 0.05 wt% of GNs into the MOF/PES membrane improved the permeability by 36 % (CO2), 41 % (N2), 31 % (CH4), and 370 % (H2). In addition, the H2/CO2 and H2/N2 selectivities of the MMMs significantly increased up to 4 and 3.3, with an improvements of 236 % and 230 %, respectively, compared to the MOF/PES membrane. Furthermore, the CH4/CO2 and CH4/N2 selectivities of the MMMs decreased by 4 %. Therefore, a hybrid filler (10 wt % of MIL-125-NH2 and 0.05 wt % of GNs is highly recommended to improve the permeability and selectivity of the PES membrane, expanding its potential applications in CH4 and H2 purification.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424, Kaunas, Lithuania
| | - Andrius Tonkonogovas
- Lithuanian Energy Institute, Laboratory of Heat Equipment Research and Testing, Breslaujos 3, LT 44403, Kaunas, Lithuania
| | - Alaa Mohamed
- Section of Chemical Science and Engineering, Department of Chemistry and Bioscience, Aalborg University, Niels Bohrs Vej 8, 6700, Esbjerg, Denmark.
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Yousef S, Eimontas J, Striūgas N, Mohamed A, Ali Abdelnaby M. Pyrolysis Kinetic Behavior and Thermodynamic Analysis of PET Nonwoven Fabric. Materials (Basel) 2023; 16:6079. [PMID: 37763357 PMCID: PMC10532786 DOI: 10.3390/ma16186079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 08/27/2023] [Accepted: 08/31/2023] [Indexed: 09/29/2023]
Abstract
This research aims to maximize polyethylene terephthalate (PET) nonwoven fabric waste and make it as a new source for benzoic acid extraction using a pyrolysis process. The treatment was performed using a thermogravimetric analyzer (TGA) and released products were characterized using FTIR spectroscopy and gas chromatography-mass spectrometry (GC-MS). The pyrolysis kinetic and thermodynamic behavior of PET fabric was also studied and simulated using different linear and nonlinear models. The results show that the PET fabric is very rich in volatile matter (80 wt.%) and can completely degrade under 490 °C with a weight loss of 84%. Meanwhile, the generated vapor was rich in the carbonylic C=O functional group (FTIR), and the GC-MS analysis concluded that benzoic acid was the major compound with an abundance of 75% that was achieved at the lowest heating rate (5 °C/min). The linear kinetic results showed that PET samples had an activation energy in the ranges of 193-256 kJ/mol (linear models) and ~161 kJ/mol (nonlinear models). The thermodynamic parameters, including enthalpy, Gibbs free energy, and entropy, were estimated in the ranges of 149-250 kJ/mol, 153-232 kJ/mol, and 256-356 J/mol K, respectively. Accordingly, pyrolysis treatment can be used to extract benzoic acid from PET fabric waste with a 134% increase in the benzoic acid abundance that can be recovered from PET bottle plastic waste.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania
| | - Justas Eimontas
- Laboratory of Combustion Processes, Lithuanian Energy Institute, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Nerijus Striūgas
- Laboratory of Combustion Processes, Lithuanian Energy Institute, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Alaa Mohamed
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy, 6th of October 12566, Egypt;
| | - Mohammed Ali Abdelnaby
- Mechatronics Systems Engineering Department, October University for Modern Sciences and Arts-MSA, Giza 12451, Egypt
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Yousef S, Eimontas J, Striūgas N, Abdelnaby MA. Effect of aluminum leaching pretreatment on catalytic pyrolysis of metallised food packaging plastics and its linear and nonlinear kinetic behaviour. Sci Total Environ 2022; 844:157150. [PMID: 35803432 DOI: 10.1016/j.scitotenv.2022.157150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/20/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
This research aims to study the effect of aluminum (Al) leaching pre-treatment on the catalytic pyrolysis of metallised food packaging plastics waste (MFPW). The experiments started with removal of Al from MFPW using leaching process to prepare Al-free mixed plastic waste (MPW). The catalytic pyrolysis of MPW over ZSM-5 zeolite catalyst was carried out using thermogravimetric (TG) analysis coupled with FTIR, while GC-MS was used to observe the compounds of the volatile products. The catalytic pyrolysis kinetic behaviour of MPW was studied using the linear and nonlinear isoconversional approaches. The elemental and proximate results showed that MPW is very rich in carbon elements (79 %) and volatile content (99 %). The TG results showed that MPW and ZSM/MPW were fully decomposed in the range of 376-496 °C without any presence of char. Based on TG-FTIR analysis, methane and carboxylic acid residue were the main groups of the synthesized volatile products, whereas nitrous oxide, 1-Butanol, 1-Propene, acetic acid, and formic acid were the major GC compounds. In case of ZSM/MPW, carbon dioxide and acetic acid were the major GC compounds at 5-25 °C/min, triphenylphosphine oxide and Phosphine oxide at 30 °C/min. The kinetic analysis showed that when the activation energies are located in the range 287-297 kJ/mol (MPW) and 153-187 kJ/mol (ZSM/MPW) and KAS, Vyazovkin, and Cai methods are the most suitable models to study pyrolysis kinetic of MPW with R2 > 89. Based on that, leaching and catalytic pyrolysis processes are a highly suggested technology that can be used to convert MFPW into high-added energy and chemical products.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania.
| | - Justas Eimontas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Nerijus Striūgas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Mohammed Ali Abdelnaby
- Mechatronics Systems Engineering Department, October University for Modern Sciences and Arts-MSA, Giza, Egypt
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Scott Z, Beeninga F, Ali-Dinar T, ElMallah M, Sterrett E, Yousef S. 82 Screening for sleep disorders in pediatric patients with cystic fibrosis: Improved knowledge and early intervention. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)00773-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Mohamed A, Yousef S, Tonkonogovas A, Makarevicius V, Stankevičius A. High performance of PES-GNs MMMs for gas separation and selectivity. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2021.103565] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Thornton G, Shetye A, Knott K, Razvi Y, Vimalesvaran K, Kurdi H, Artico J, Yousef S, Antonakaki D, Kellman P, Knight D, Cole GD, Moon JC, Fontana M, Treibel TA. Myocardial perfusion after COVID-19 infection: No persisting impaired myocardial blood flow in surviving patients. Eur Heart J Cardiovasc Imaging 2021. [PMCID: PMC8344937 DOI: 10.1093/ehjci/jeab090.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Funding Acknowledgements Type of funding sources: None. Background Acute myocardial damage is common in hospitalized patients with severe COVID-19, with evidence of myocardial infarction and myocarditis demonstrated on cardiovascular magnetic resonance (CMR). Post-mortem studies have also implicated microvascular thrombosis, which may cause persistent microvascular disease. Purpose To determine the long-term coronary sequelae in recovered COVID-19 using multiparametric CMR including state-of-the-art inline quantitative stress myocardial blood flow (sMBF) mapping to assess global and regional sMBF. Methods Prospective, multicentre observational study of recovered COVID-19 patients scanned at three London CMR units. Results were compared to a propensity-matched, pre-COVID chest pain cohort (104 patients referred for perfusion CMR, with subsequently demonstrated unobstructed coronary arteries) and 27 healthy volunteers (HV). Perfusion image analysis was performed using a novel artificial intelligence approach deriving global and regional stress and rest MBF with a cut-off of >2.25mL/g/min signifying normal sMBF and <1.82mL/g/min abnormal sMBF (Kotecha JCVI 2019). Results 104 recovered, post-COVID patients (median age 62 years, 76% male; 89[87%] hospitalised, 41/89[46%] requiring ICU) underwent adenosine-stress perfusion CMR at a median 131(IQR 43-179) days from COVID-19 diagnosis. Median LVEF was 67% (IQR 60-71%; 12 (11.5%) with impaired LVEF), 51 patients (49%) had late gadolinium enhancement (LGE); 18% infarct-pattern and 33% non-ischaemic LGE. Global stress MBF in post-COVID patients was no different to age-, sex- and co-morbidities-matched controls (2.57 ± 0.77 vs. 2.40 ± 0.75 ml/g/min, p = 0.11, Figure 1), though lower than HV (3.00 ± 0.76 ml/g/min, p = 0.001). Post-COVID, multivariate predictors of low sMBF were male sex (OR 0.57, 95%CI 0.41-0.80, p = 0.001) and hypertension (OR 0.67, 95%CI 0.51-0.88, p = 0.004), but not COVID-19 disease severity (ICU admission) or presence of scar (ischemic/non-ischemic). 21/42 with reduced sMBF (<2.25mL/g/min) had regional perfusion defects consistent with epicardial coronary disease. Conclusions COVID-19 survivors do not demonstrate evidence of reduced global MBF by CMR compared to risk factor matched controls. Stress perfusion CMR identifies etiology of acute myocardial damage (infarction/myocarditis) and presence of occult coronary ischemia.
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Affiliation(s)
- G Thornton
- University College London, London, United Kingdom of Great Britain & Northern Ireland
| | - A Shetye
- University College London, London, United Kingdom of Great Britain & Northern Ireland
| | - K Knott
- King"s College Hospital NHS Foundation Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - Y Razvi
- University College London, London, United Kingdom of Great Britain & Northern Ireland
| | - K Vimalesvaran
- Imperial College London, London, United Kingdom of Great Britain & Northern Ireland
| | - H Kurdi
- Barts Health NHS Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - J Artico
- Barts Health NHS Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - S Yousef
- Barts Health NHS Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - D Antonakaki
- Barts Health NHS Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - P Kellman
- National Heart Lung and Blood Institute, Bethesda, United States of America
| | - D Knight
- University College London, London, United Kingdom of Great Britain & Northern Ireland
| | - GD Cole
- Imperial College London, London, United Kingdom of Great Britain & Northern Ireland
| | - JC Moon
- University College London, London, United Kingdom of Great Britain & Northern Ireland
| | - M Fontana
- University College London, London, United Kingdom of Great Britain & Northern Ireland
| | - TA Treibel
- University College London, London, United Kingdom of Great Britain & Northern Ireland
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Yousef S, Eimontas J, Striūgas N, Abdelnaby MA. Pyrolysis kinetic behaviour and TG-FTIR-GC-MS analysis of Coronavirus Face Masks. J Anal Appl Pyrolysis 2021; 156:105118. [PMID: 33875899 PMCID: PMC8045431 DOI: 10.1016/j.jaap.2021.105118] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 03/15/2021] [Accepted: 03/25/2021] [Indexed: 05/06/2023]
Abstract
In the times of Covid-19, face masks are considered to be the main source of protection against the virus that reduces its spread. These masks are classified as single-use medical products with a very short service life, estimated at few days, hence millions of contaminated masks are generated daily in the form of hazardous materials, what requires to develop a safe method to dispose of them, especially since some of them are loaded with viruses. 3-ply face masks (3PFM) represent the major fraction of this waste and are composed mainly from polypropylene and melt blown filter with high content of volatile substances (96.6 wt.%), what makes pyrolysis treatment an emerging technology that could be used to dispose of face masks and convert them into energy products. In this context, this work aims to study pyrolysis kinetic behaviour and TG-FTIR-GC-MS analysis of 3PFM. The research started with analysis of 3PFM using elemental analysis, proximate analysis, and compositional analyses. Afterwards, TG-FTIR system was used to study the thermal and chemical decomposition of 3PFM analyzed at different heating rates: 5, 10, 15, 20, 25, and 30 °C/min. The GC/MS system was used to observe the synthesized volatile products at the maximum decomposition temperatures. After that, isoconversional methods, the advanced nonlinear integral isoconversional method, and the iterative linear integral isoconversional method were used to determine the activation energies of mask pyrolysis, while the distributed activation energy model and the independent parallel reactions kinetic model were used to fit TGA and DTG curves with deviations below <1. The TGA-DTG results showed that 3PFM can decompose in three different periods with a total weight loss of 95 % and maximum decomposition in the range 405-510 °C, while the FTIR spectra and GC-MS analysis exhibited that - C-H (aromatic and aliphatic) and 2,4-Dimethyl-1-heptene (28-43 % based on heating rate) represented the major compounds in the released volatile components. Finally, Vyazovkin and the iterative linear integral isoconversional methods gave activation energies almost similar to that obtained by the KAS isoconversional method.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424, Kaunas, Lithuania
- Department of Materials Science, South Ural State University, Lenin Prospect 76, 454080, Chelyabinsk, Russia
| | - Justas Eimontas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403, Kaunas, Lithuania
| | - Nerijus Striūgas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403, Kaunas, Lithuania
| | - Mohammed Ali Abdelnaby
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy 6th of October, Egypt
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Yousef S, Eimontas J, Zakarauskas K, Striūgas N, Mohamed A. A new strategy for using lint-microfibers generated from clothes dryer as a sustainable source of renewable energy. Sci Total Environ 2021; 762:143107. [PMID: 33129549 DOI: 10.1016/j.scitotenv.2020.143107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 10/12/2020] [Accepted: 10/13/2020] [Indexed: 05/22/2023]
Abstract
Lint-microfibers (LMs) generated during clothes drying are classified as primary microplastics and consist mainly of cotton, polyester and lignin. This research aims to convert LMFs into energy products using a pyrolysis treatment. The pyrolysis experiments were performed using a pilot pyrolysis plant. SEM-EDS was used to observe the morphology and elemental composition of the feedstock and the obtained biochar, while a digital unit of Instantaneous Gas analyzer and Gas chromatography (GC) were used to observe the concentration of O2, N2, CO2, CO, H2, CH4 gases during the whole conversion process. Finally, a simple mathematical model was developed to evaluate the economic and environmental performance of the suggested strategy based on the LMFs generated by one million persons. Based on the results of the developed model and yield of pyrolysis process, around 45 tons of LMFs are generated by one million persons annually and this amount is enough to produce 13.8 tons of oil (~31%), 21.5 tons of gas (47.7%), and 9.7 ton of char (21.6%) with estimated profitability of 120,400$ and reduction in carbon footprint estimated at -42,039,000kg CO2-eq/t of LMFs.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania; Department of Materials Science, South Ural State University, Lenin prospect 76, 454080 Chelyabinsk, Russia.
| | - Justas Eimontas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Kęstutis Zakarauskas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Nerijus Striūgas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania
| | - Alaa Mohamed
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Yousef S, Kuliešienė N, Sakalauskaitė S, Nenartavičius T, Daugelavičius R. Sustainable green strategy for recovery of glucose from end-of-life euro banknotes. Waste Manag 2021; 123:23-32. [PMID: 33549877 DOI: 10.1016/j.wasman.2021.01.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 06/18/2020] [Accepted: 01/07/2021] [Indexed: 05/22/2023]
Abstract
Usually, Euro banknotes are made from cotton substrates and their waste is disposed of in landfill or is incinerated. In order to valorize the end-of-life euro banknotes (ELEBs), the substrates were used in this research for cellulase production via submerged fungal fermentation (SFF), and the resultant fungal cellulase w s used in ELEBs hydrolysis process for extraction of glucose. The experiments were started by exposing the ELEBs to different types of pretreatments, including milling process, alkali (NaOH/urea solution), and acid leaching to remove any contamination (e.g. dyes) and to decrease the crystallinity of cellulose (the main element in cotton substrate) thus increasing the degradation rate during the fermentation process. The effect of pretreatments on the morphology and chemical composition of ELEBs was observed using Scanning Electron Microscope and Energy Dispersive Spectrometry. Afterwards, Trichoderma reesei-DSM76 was used for cellulase production from the treated ELEBs with high cellulase activity (12.97 FPU/g). The resultant cellulase was upscaled in a bioreactor and used in ELEBs hydrolysis. Finally, the results showed that the optimized pretreatment methods (milling followed by leaching process) significantly improved the cellulase activity and glucose recovery, which was estimated by 96%. According to the obtained results, the developed strategy has a great potential for conversion of ELEBs into a glucose product that could be used in biofuels and bioplastics applications.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania; Department of Materials Science, South Ural State University, Lenin Prospect 76, 454080 Chelyabinsk, Russia.
| | - Neringa Kuliešienė
- Department of Biochemistry, Vytautas Magnus University, Kaunas, Lithuania
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Abd E, Gomes J, Sales CC, Yousef S, Forouz F, Telaprolu KC, Roberts MS, Grice JE, Lopes PS, Leite-Silva VR, Andréo-Filho N. Deformable liposomes as enhancer of caffeine penetration through human skin in a Franz diffusion cell test. Int J Cosmet Sci 2020; 43:1-10. [PMID: 32866296 DOI: 10.1111/ics.12659] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/17/2020] [Accepted: 08/24/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The permeation of hydrophilic molecules through the skin is still a challenge due to the barrier posed by stratum corneum, the outermost layer of the skin. Liposomes have frequently been used as carriers for different types of drugs and may also function as permeation enhancers. Propylene glycol has also been used as an edge activator in liposomes to increase the permeation. The aim of this work was to prepare liposomes containing an edge activator and loaded with caffeine to evaluate the potential of caffeine reaching the deeper layers in the skin. METHODS The formulations were prepared by a top-down process using high-pressure homogenization at 200 00 psi for 10 min. They were characterized by size, polydispersity index (PI), zeta potential (ZP), pH, caffeine content and encapsulation efficiency (EE%) on preparation (time zero) and after 30 days. Cytotoxicity of blank and loaded liposomes was assessed by MTT proliferation assay with a normal keratinocyte cell line (HaCaT). In vitro permeation tests were performed with human skin in Franz cells over 24 h, and caffeine concentration was determined in the skin surface, stratum corneum, dermo-epidermal fraction and receptor medium by HPLC. RESULTS The caffeine liposomes with (DL-Caf) or without propylene glycol (CL-Caf) showed, respectively, mean size 94.5 and 95.4 nm, PI 0.48 and 0.42, ZP + 1.3 and + 18.1 mV and caffeine content of 78.57 and 80.13%. IC50 values of caffeine in DL-Caf (3.59 v/v %) and CL-Caf (3.65 v/v %) were not significantly different from conventional blank liposome (3.27 v/v %). The DL-Caf formulation presented the best capability to enhance the caffeine permeation through the skin, resulting 1.94-folds higher than caffeine solution. Furthermore, the caffeine flux from DL-Caf was 1.56- and 3.05-folds higher than caffeine solution and CL-Caf, respectively. On the other hand, CL-Caf showed the lowest caffeine penetration revealing the importance of edge activator to aid hydrophilic drug penetration to all skin layers. CONCLUSION The DL-Caf formulation tested was able to improve the permeation of caffeine through the stratum corneum and dermo-epidermal layers, suggesting that this delivery system may be effective for deep skin delivery of hydrophilic drugs.
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Affiliation(s)
- E Abd
- Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent Street, Woolloongabba, Qld., 4072, Australia
| | - J Gomes
- Departamento de Ciências Farmacêuticas, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau, 210, prédio de vidro, Diadema, SP, CEP 09913-030, Brazil
| | - C C Sales
- Departamento de Ciências Farmacêuticas, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau, 210, prédio de vidro, Diadema, SP, CEP 09913-030, Brazil
| | - S Yousef
- Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent Street, Woolloongabba, Qld., 4072, Australia.,Faculty of Pharmacy, Helwan University, Helwan, Cairo, 11795, Egypt
| | - F Forouz
- Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent Street, Woolloongabba, Qld., 4072, Australia
| | - K C Telaprolu
- Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent Street, Woolloongabba, Qld., 4072, Australia
| | - M S Roberts
- Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent Street, Woolloongabba, Qld., 4072, Australia.,Clinical and Health Sciences, City West Campus, Level 6 Cancer Research Institute (UniSA CRI), University of South Australia, North Terrace, Adelaide, S.A., 5000, Australia
| | - J E Grice
- Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent Street, Woolloongabba, Qld., 4072, Australia
| | - P S Lopes
- Departamento de Ciências Farmacêuticas, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau, 210, prédio de vidro, Diadema, SP, CEP 09913-030, Brazil
| | - V R Leite-Silva
- Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent Street, Woolloongabba, Qld., 4072, Australia.,Departamento de Ciências Farmacêuticas, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau, 210, prédio de vidro, Diadema, SP, CEP 09913-030, Brazil
| | - N Andréo-Filho
- Departamento de Ciências Farmacêuticas, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau, 210, prédio de vidro, Diadema, SP, CEP 09913-030, Brazil
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Yousef S, Eimontas J, Striūgas N, Abdelnaby MA. Modeling of Metalized Food Packaging Plastics Pyrolysis Kinetics Using an Independent Parallel Reactions Kinetic Model. Polymers (Basel) 2020; 12:E1763. [PMID: 32781759 PMCID: PMC7465160 DOI: 10.3390/polym12081763] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 07/28/2020] [Accepted: 08/04/2020] [Indexed: 11/16/2022] Open
Abstract
Recently, a pyrolysis process has been adapted as an emerging technology to convert metalized food packaging plastics waste (MFPWs) into energy products with a high economic benefit. In order to upscale this technology, the knowledge of the pyrolysis kinetic of MFPWs is needed and studying these parameters using free methods is not sufficient to describe the last stages of pyrolysis. For a better understanding of MFPWs pyrolysis kinetics, independent parallel reactions (IPR) kinetic model and its modification model (MIPR) were used in the present research to describe the kinetic parameters of MFPWs pyrolysis at different heating rates (5-30 °C min-1). The IPR and MIPR models were built according to thermogravimetric (TG)-Fourier-transform infrared spectroscopy (FTIR)-gas chromatography-mass spectrometry (GC-MS) results of three different types of MFPWs (coffee, chips, and chocolate) and their mixture. The accuracy of the developed kinetic models was evaluated by comparing the conformity of the DTG experimental results to the data calculated using IPR and MIPR models. The results showed that the dependence of the pre-exponential factor on the heating rate (as in the case of MIPR model) led to better conformity results with high predictability of kinetic parameters with an average deviation of 2.35% (with an improvement of 73%, when compared to the IPR model). Additionally, the values of activation energy and pre-exponential factor were calculated using the MIPR model and estimated at 294 kJ mol-1 and 5.77 × 1017 kJ mol-1 (for the mixed MFPW sample), respectively. Finally, GC-MS results illustrated that pentane (13.8%) and 2,4-dimethyl-1-heptene isopropylcyclobutane (44.31%) represent the main compounds in the released volatile products at the maximum decomposition temperature.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania
- Department of Materials Science, South Ural State University, Lenin prospect 76, 454080 Chelyabinsk, Russia
| | - Justas Eimontas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania; (J.E.); (N.S.)
| | - Nerijus Striūgas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania; (J.E.); (N.S.)
| | - Mohammed Ali Abdelnaby
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy, 6th of October 12566, Egypt;
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Yousef S, Sarwar Z, Šereika J, Striūgas N, Krugly E, Danilovas PP, Martuzevicius D. A New Industrial Technology for Mass Production of Graphene/PEBA Membranes for CO 2/CH 4 Selectivity with High Dispersion, Thermal and Mechanical Performance. Polymers (Basel) 2020; 12:E831. [PMID: 32260569 PMCID: PMC7240517 DOI: 10.3390/polym12040831] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 03/31/2020] [Accepted: 04/02/2020] [Indexed: 11/16/2022] Open
Abstract
Polyether block amide (PEBA) nanocomposite membranes, including Graphene (GA)/PEBA membranes are considered to be a promising emerging technology for removing CO2 from natural gas and biogas. However, poor dispersion of GA in the produced membranes at industrial scale still forms the main barrier to commercialize. Within this frame, this research aims to develop a new industrial approach to produce GA/PEBA granules that could be used as a feedstock material for mass production of GA/PEBA membranes. The developed approach consists of three sequential phases. The first stage was concentrated on production of GA/PEBA granules using extrusion process (at 170-210 °C, depending on GA concentration) in the presence of Paraffin Liquid (PL) as an adhesive layer (between GA and PEBA) and assisted melting of PEBA. The second phase was devoted to production of GA/PEBA membranes using a solution casting method. The last phase was focused on evaluation of CO2/CH4 selectivity of the fabricated membranes at low and high temperatures (25 and 55 °C) at a constant feeding pressure (2 bar) using a test rig built especially for that purpose. The granules and membranes were prepared with different concentrations of GA in the range 0.05 to 0.5 wt.% and constant amount of PL (2 wt.%). Also, the morphology, physical, chemical, thermal, and mechanical behaviors of the synthesized membranes were analyzed with the help of SEM, TEM, XRD, FTIR, TGA-DTG, and universal testing machine. The results showed that incorporation of GA with PEBA using the developed approach resulted in significant improvements in dispersion, thermal, and mechanical properties (higher elasticity increased by ~10%). Also, ideal CO2/CH4 selectivity was improved by 29% at 25 °C and 32% at 55 °C.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania
- Department of Materials Science, South Ural State University, Lenin Prospect 76, 454080 Chelyabinsk, Russia
| | - Zahid Sarwar
- Faculty of Chemical Technology, Kaunas University of Technology, LT-50254 Kaunas, Lithuania; (Z.S.); (E.K.); (P.P.D.); (D.M.)
| | - Justas Šereika
- Lithuanian Energy Institute, Laboratory of Heat Equipment Research and Testing, Breslaujos 3, LT-44403 Kaunas, Lithuania;
| | - Nerijus Striūgas
- Lithuanian Energy Institute, Laboratory of Combustion Processes, Breslaujos 3, LT-44403 Kaunas, Lithuania;
| | - Edvinas Krugly
- Faculty of Chemical Technology, Kaunas University of Technology, LT-50254 Kaunas, Lithuania; (Z.S.); (E.K.); (P.P.D.); (D.M.)
| | - Paulius Pavelas Danilovas
- Faculty of Chemical Technology, Kaunas University of Technology, LT-50254 Kaunas, Lithuania; (Z.S.); (E.K.); (P.P.D.); (D.M.)
| | - Dainius Martuzevicius
- Faculty of Chemical Technology, Kaunas University of Technology, LT-50254 Kaunas, Lithuania; (Z.S.); (E.K.); (P.P.D.); (D.M.)
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Sarwar Z, Yousef S, Tatariants M, Krugly E, Čiužas D, Danilovas PP, Baltusnikas A, Martuzevicius D. Fibrous PEBA-graphene nanocomposite filaments and membranes fabricated by extrusion and additive manufacturing. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.109317] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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16
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Yousef S, Tatariants M, Tichonovas M, Makarevicius V. Sustainable technology for mass production of Ag nanoparticles and Al microparticles from damaged solar cell wafers. Waste Manag 2019; 98:126-134. [PMID: 31445457 DOI: 10.1016/j.wasman.2019.08.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 07/29/2019] [Accepted: 08/13/2019] [Indexed: 06/10/2023]
Abstract
Solar cell industry produces high quantities of waste in form of broken, damaged, and rejected cells, whereas milling and filtering practices are typically used to recover the valuable materials (Al, Ag and Si) from such Waste Solar Cell Wafers (WSCWs). This recycling approach has its disadvantages, e.g. excessive energy consumption and dust emission causing loss of valuable metals. To fulfil the concept of Zero Waste for WSCWs, the authors present a sustainable technology for liberation of valuable metals from WSCWs and synthesis of added value products, in particular Ag nanoparticles and Al microparticles. The suggested technology consisted of three different approaches combined to liberate each material individually. The technology started with an Al layer disintegration process using Dimethyl Sulfoxide (as an eco-friendly and sustainable solvent) supported by ultrasonic treatment to break van der Waals' bonding between spherical Al microparticles that compose the Al paste layer, thus liberating Al in microparticle suspension form with particle size ∼3 μm, recovery rate >98%. After that, leaching by nitric acid and other eco-friendly reagents (Sodium Chloride, Ammonia solution and glucose syrup) assisted by ultrasonic treatment was used to dissolve Ag and later precipitate it in form of nanoparticles with avg. size 30 nm, yield >92%. Finally, etching using paste containing phosphoric acid was done to remove anti-reflection coating and purify the Si substrate with final recovery rate >99%. SEM-EDS, XRD, FTIR, and TEM were used for analysis of extracted materials as well as changes in the solvent. Investigation was also concerned with determining economic/global warming impacts of the technology.
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Affiliation(s)
- Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania; Department of Mechatronics Engineering, Canadian International College, 5th Settlement, New Cairo, Egypt.
| | - Maksym Tatariants
- Department of Environmental Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-50254 Kaunas, Lithuania
| | - Martynas Tichonovas
- Department of Environmental Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-50254 Kaunas, Lithuania
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Visco A, Yousef S, Scolaro C, Espro C, Cristani M. Tribological Behavior of Nanocomposites Based on UHMWPE Aged in Simulated Synovial Fluid. Polymers (Basel) 2018; 10:E1291. [PMID: 30961216 PMCID: PMC6401863 DOI: 10.3390/polym10111291] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 11/16/2018] [Accepted: 11/19/2018] [Indexed: 11/25/2022] Open
Abstract
Ultra High molecular weight polyethylene (UHMWPE) suffers wear degradation in total joint replacements and it needs to be improved. Thus, we enhanced wear resistance of UHMWPE with carbon nanofiller and paraffin oil and studied its tribological behavior in Simulated Synovial Fluid (SSF) for 60 days at 37 °C to reproduce the conditions of a real joint. Ageing in biological fluid accelerates the wear action but nanocomposite exhibited a higher wear resistance compared to UHMWPE because of its higher structural homogeneity. Carbon nanofiller closes the porosity of UHMWPE hindering SSF to penetrate inside. Wear resistance of the nanocomposite with 1.0 wt.% of CNF improved of 65% (before ageing) and of 70% (after 60 days in SSF) with respect to pure UHMWPE.
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Affiliation(s)
- Annamaria Visco
- Department of Engineering, University of Messina, C.da Di Dio, 98166 Messina, Italy.
- Institute for Chemical-Physical Processes CNR-IPCF, Viale Ferdinando Stagno d'Alcontres, 37, 98158 Messina, Italy.
| | - Samy Yousef
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy 6th of October, Giza 12511, Egypt.
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania.
| | - Cristina Scolaro
- Department of Engineering, University of Messina, C.da Di Dio, 98166 Messina, Italy.
| | - Claudia Espro
- Department of Engineering, University of Messina, C.da Di Dio, 98166 Messina, Italy.
| | - Mariateresa Cristani
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, V. Annunziata, 98168 Messina, Italy.
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Tatariants M, Yousef S, Sakalauskaitė S, Daugelavičius R, Denafas G, Bendikiene R. Antimicrobial copper nanoparticles synthesized from waste printed circuit boards using advanced chemical technology. Waste Manag 2018; 78:521-531. [PMID: 32559941 DOI: 10.1016/j.wasman.2018.06.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 06/08/2018] [Accepted: 06/09/2018] [Indexed: 06/11/2023]
Abstract
Waste Printed Circuit Boards (WPCBs) were classified as one of the most important resources for urban mining containing high purity Copper (Cu) and other valuable materials. Recently, a dissolution recycling approach enhanced by ultrasonic treatment succeeded in the liberation of Cu foils from WPCBs as received. This research aims to synthesize Copper Nanoparticles (Cu-NPs) from the recovered Cu by using an advanced chemistry approach to obtain nano-product with high added value taking into consideration environmental risks. The experiments were carried out on the Cu foils recovered from the three types of WPCBs with different purity of Cu (Motherboard, Video Card, and Random Access Memory (RAM)). The synthesis process was performed in two stages: (a) preparation of Copper (II) Sulfate aqueous solutions from the recovered Cu and (b) chemical reduction of solutions for synthesis of Cu-NPs by using Native Cyclodextrins (NCDs), particularly ß-NCD as stabilizers. The efficiency of the developed approach for raw material of different purity was assessed and the final yield and the estimated recovery cost of synthesized Cu-NPs were calculated with high accuracy as well as the properties of the synthesized Cu-NPs. The obtained Cu-NPs were examined using SEM-EDS, TEM, XRD, Raman Spectroscopy, and TGA. To maximize the potential biomedical application benefits, the antibacterial activity of Cu-NPs was investigated by the standard microdilution method for E. coli, P. aeruginosa, and S. aureus bacterial cultures. The results showed that the produced Cu-NPs had an average size of 7 nm and yield 90%, while the preparation costs were 6 times lower in comparison to the commercial counterparts. In addition, the results indicated that the synthesized Cu-NPs from RAM sample had a good antimicrobial action.
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Affiliation(s)
- Maksym Tatariants
- Department of Environmental Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51424 Kaunas, Lithuania
| | - Samy Yousef
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania; Department of Production Engineering and Printing Technology, Akhbar Elyom Academy 6th of October, Egypt.
| | | | | | - Gintaras Denafas
- Department of Environmental Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51424 Kaunas, Lithuania
| | - Regita Bendikiene
- Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, Lithuania
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Yousef S, Ali S, Abdelnaby MA, Christova D, Hassan Y, Samir D, Kamel B. Synthesis and characterization of CNTs/POM nanocomposite acetabular hip cup. INT J POLYM MATER PO 2018. [DOI: 10.1080/00914037.2017.1362641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Samy Yousef
- Department of Manufacturing Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Kaunas, Lithuania
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy Egypt, Giza, Egypt
| | - Shady Ali
- Department of Mechatronics, Canadian International College, Fifth Settlement, New Cairo, Egypt
| | - Mohammed Ali Abdelnaby
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy Egypt, Giza, Egypt
| | - D. Christova
- Institute of Polymers, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Y. Hassan
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy Egypt, Giza, Egypt
| | - D. Samir
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy Egypt, Giza, Egypt
| | - B. Kamel
- Department of Production Engineering and Printing Technology, Akhbar Elyom Academy Egypt, Giza, Egypt
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Elbarazi I, Loney T, Yousef S, Elias A. Prevalence of and factors associated with burnout among health care professionals in Arab countries: a systematic review. BMC Health Serv Res 2017; 17:491. [PMID: 28716142 PMCID: PMC5513024 DOI: 10.1186/s12913-017-2319-8] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 05/18/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Burnout among healthcare professionals is one of the key challenges affecting health care practice and quality of care. This systematic review aims to (1) estimate the prevalence of burnout among health care professionals (HCP) in Arab countries; and (2) explore individual and work-related factors associated with burnout in this population. METHODS Multiple electronic databases were searched for studies published in English or Arabic from January 1980 to November 2014 assessing burnout (using the Maslach Burnout Inventory; MBI) amongst health care professionals (HCP) in Arab countries. RESULTS Nineteen studies (N = 4108; 49.3% females) conducted on HCP in Bahrain, Egypt, Jordan, Lebanon, Palestine, Saudi Arabia and Yemen were included in this review. There was a wide range of prevalence estimates for the three MBI subscales, high Emotional Exhaustion (20.0-81.0%), high Depersonalization (9.2-80.0%), and low Personal Accomplishment (13.3-85.8%). Gender, nationality, service duration, working hours, and shift patterns were all significantly associated with burnout. CONCLUSIONS Within the constraints of the study and the range of quality papers available, our review revealed moderate-to-high estimates of self-reported burnout among HCP in Arab countries that are similar to prevalence estimates in non-Arabic speaking westernized developed countries. In order to develop culturally appropriate interventions, further research using longitudinal designs is needed to confirm the risk factors for burnout in specific HCP settings and specialties in Arab countries.
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Affiliation(s)
- I Elbarazi
- Institute of Public Health, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, United Arab Emirates
| | - T Loney
- Institute of Public Health, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, United Arab Emirates
| | - S Yousef
- Department of Psychiatry and Behavioral Science, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, United Arab Emirates
| | - A Elias
- Institute of Public Health, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, United Arab Emirates.
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Mohamed A, Yousef S, Ali Abdelnaby M, Osman T, Hamawandi B, Toprak M, Muhammed M, Uheida A. Photocatalytic degradation of organic dyes and enhanced mechanical properties of PAN/CNTs composite nanofibers. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.03.051] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Tatariants M, Yousef S, Sidaraviciute R, Denafas G, Bendikiene R. Characterization of waste printed circuit boards recycled using a dissolution approach and ultrasonic treatment at low temperatures. RSC Adv 2017. [DOI: 10.1039/c7ra07034a] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
All the WPCB samples had similar structure, which comprises six layers of fiberglass (representing WPCB substrate), two copper foil layers (upper and lower layers), copper tracks, through-hole pads and two soldermask layers (upper and lower layers).
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Affiliation(s)
- Maksym Tatariants
- Department of Environmental Technology
- Faculty of Chemical Technology
- Kaunas University of Technology
- LT-50254 Kaunas
- Lithuania
| | - Samy Yousef
- Department of Production Engineering
- Faculty of Mechanical Engineering and Design
- Kaunas University of Technology
- LT-51424 Kaunas
- Lithuania
| | - Ruta Sidaraviciute
- Department of Environmental Technology
- Faculty of Chemical Technology
- Kaunas University of Technology
- LT-50254 Kaunas
- Lithuania
| | - Gintaras Denafas
- Department of Environmental Technology
- Faculty of Chemical Technology
- Kaunas University of Technology
- LT-50254 Kaunas
- Lithuania
| | - Regita Bendikiene
- Department of Production Engineering
- Faculty of Mechanical Engineering and Design
- Kaunas University of Technology
- LT-51424 Kaunas
- Lithuania
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Yousef S, Mamdouh R. Class I Integron and β-lactamase encoding genes of multidrug resistance Salmonella isolated from pigeons and their environments. Cell Mol Biol (Noisy-le-grand) 2016; 62:48-54. [PMID: 28145856 DOI: 10.14715/cmb/2016.62.14.8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 12/26/2016] [Accepted: 12/26/2016] [Indexed: 11/18/2022]
Abstract
Seroprevalence of Salmonella spp. was investigated in pigeon and its surrounding environment of Sharkia province, Egypt. Samples were randomly collected from fifty freshly dead squabs, forty freshly dead adults pigeons, sixty diseased adult pigeons and 100 apparently healthy adult pigeons. Bacterial isolates were tested for their susceptibility to 17 different antimicrobial discs, by using the disc diffusion method. The bacterial isolates were tested for Class I and β-lactamase encoding genes by using PCR. In vitro sensitivity of all Salmonella isolates were completely resistant to Streptomycin, Amoxicillin, clavulanic acid, Amoxicillin, Ampicillin and Ceftazidime (100%). Class1 integron were characterized in 70% Salmonella isolates from squabs, 42.9 % in adult pigeons and 14.3% in pigeon environment which confer their resistance to streptomycin and ampicillin. Meanwhile TEM-1 β-lactamase was characterized in 20% of tested Salmonella isolates from squabs including S. Entertidis, 42.9% of tested Salmonella isolates from adult pigeons including S. Entertidis which confer their resistance to cephalosporin and not detected in all isolates from pigeons environments. In conclusion TEM-1 β-lactamase was characterized in 20% of Salmonella isolates from squabs while Class1 integron was characterized in 70% Salmonella isolates from squabs.
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Affiliation(s)
- S Yousef
- Bacteriology, Mycology and Immunology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig
| | - R Mamdouh
- Bacteriology, Mycology and immunology department, Faculty of Veterinary Medicine, Kafer elshikh University ,Kafer elshikh
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Roberts MS, Mohammed Y, Pastore MN, Namjoshi S, Yousef S, Alinaghi A, Haridass IN, Abd E, Leite-Silva VR, Benson H, Grice JE. Topical and cutaneous delivery using nanosystems. J Control Release 2016; 247:86-105. [PMID: 28024914 DOI: 10.1016/j.jconrel.2016.12.022] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Accepted: 12/20/2016] [Indexed: 12/11/2022]
Abstract
The goal of topical and cutaneous delivery is to deliver therapeutic and other substances to a desired target site in the skin at appropriate doses to achieve a safe and efficacious outcome. Normally, however, when the stratum corneum is intact and the skin barrier is uncompromised, this is limited to molecules that are relatively lipophilic, small and uncharged, thereby excluding many potentially useful therapeutic peptides, proteins, vaccines, gene fragments or drug-carrying particles. In this review we will describe how nanosystems are being increasingly exploited for topical and cutaneous delivery, particularly for these previously difficult substances. This is also being driven by the development of novel technologies, which include minimally invasive delivery systems and more precise fabrication techniques. While there is a vast array of nanosystems under development and many undergoing advanced clinical trials, relatively few have achieved full translation to clinical practice. This slow uptake may be due, in part, to the need for a rigorous demonstration of safety in these new nanotechnologies. Some of the safety aspects associated with nanosystems will be considered in this review.
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Affiliation(s)
- M S Roberts
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia; School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia.
| | - Y Mohammed
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia
| | - M N Pastore
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia
| | - S Namjoshi
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia
| | - S Yousef
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia
| | - A Alinaghi
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia
| | - I N Haridass
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia; School of Pharmacy, Curtin Health Innovation Research Institute, Curtin University, GPO Box U1987, Perth, WA, Australia
| | - E Abd
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia
| | - V R Leite-Silva
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia
| | - Hae Benson
- School of Pharmacy, Curtin Health Innovation Research Institute, Curtin University, GPO Box U1987, Perth, WA, Australia
| | - J E Grice
- Therapeutics Research Centre, School of Medicine, The University of Queensland, Translational Research Institute, QLD, 4102, Australia
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25
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Yousef S, Visco A, Galtieri G, Nocita D, Espro C. Wear behaviour of UHMWPE reinforced by carbon nanofiller and paraffin oil for joint replacement. Mater Sci Eng C Mater Biol Appl 2016; 73:234-244. [PMID: 28183604 DOI: 10.1016/j.msec.2016.11.088] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 11/03/2016] [Accepted: 11/23/2016] [Indexed: 11/30/2022]
Abstract
The majority of artificial joints incorporate biomedical grade Ultra High Molecular Weight Poly Ethylene (UHMWPE), whose wear is considered most important in controlling service time of the whole joint. The aim of this work was to improve wear resistance of UHMWPE through the addition of 0.5-2.0wt% of Carbon Nano Filler (CNF) and 2% wt of Paraffin Oil (PO) using ball milling (BM) and extrusion techniques (EX). The wear tests on these nanocomposites were conducted by a pin on disc in dry (air) and wet media (simulated synovial fluid or artificial lubricant, and bovine synovial fluid or natural lubricant). Mechanical tests (tensile and hardness), physical analysis (calorimetric, density, wet ability, roughness) and morphological observations were also performed. The experimental results showed that natural lubricant provides the greatest reduction in wear rate while the largest one occurred in air. Furthermore, the BM mixed nanocomposites with a filler load of 1.0% exhibited the best wear resistance among all the samples with an improvement of 42%, 64% and 83% in air, artificial and natural lubricant, respectively. This is due to its higher ductility and thermal features, and lower wet ability in the two lubricants.
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Affiliation(s)
- Samy Yousef
- Department of Engineering, University of Messina, Contrada Di Dio, I-98166 Messina, Italy; Dept. of Production Engineering and Printing Technology, Akhbar Elyom Academy, 6th of October, Egypt
| | - Annamaria Visco
- Department of Engineering, University of Messina, Contrada Di Dio, I-98166 Messina, Italy.
| | - Giovanna Galtieri
- Department of Engineering, University of Messina, Contrada Di Dio, I-98166 Messina, Italy
| | - Davide Nocita
- Department of Engineering, University of Messina, Contrada Di Dio, I-98166 Messina, Italy
| | - Claudia Espro
- Department of Engineering, University of Messina, Contrada Di Dio, I-98166 Messina, Italy
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Yousef S, Visco A, Galtieri G, Njuguna J. Flexural, impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil. POLYM ADVAN TECHNOL 2016. [DOI: 10.1002/pat.3801] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Samy Yousef
- Department of Production Engineering and Printing Technology; Akhbar Elyom Academy; 6th of October Egypt
- Department of Engineering; University of Messina; Contrada Di Dio, Vill. S.Agata 98166 Messina Italy
| | - Annamaria Visco
- Department of Engineering; University of Messina; Contrada Di Dio, Vill. S.Agata 98166 Messina Italy
| | - Giovanna Galtieri
- Department of Engineering; University of Messina; Contrada Di Dio, Vill. S.Agata 98166 Messina Italy
| | - James Njuguna
- Centre for Advanced Engineering Materials, School of Engineering; Robert Gordon University; Riverside East, Garthdee Road Aberdeen AB10 7GJ UK
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Alhajali S, Yousef S, Naoum B. Appropriate concrete for nuclear reactor shielding. Appl Radiat Isot 2015; 107:29-32. [PMID: 26408911 DOI: 10.1016/j.apradiso.2015.09.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 09/01/2015] [Accepted: 09/01/2015] [Indexed: 11/17/2022]
Abstract
A survey for the neutron activation significant trace-minerals in limestones from different sites in Syria has been carried out. The specific saturation activation radioactivity was calculated and compared to the clearance levels. The results show that the limestone composition varies significantly from one site to another. For example Al-Tamoura site has ∑(C(i)/CL(i))≤1 at thermal neutron flux less than 10(7) (n cm(-2) s(-1)), while the limestone from other the three sites has ∑(C(i)/CL(i))≤1 at a flux less than 3×10(6) (n cm(-2) s(-1)).
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Affiliation(s)
- S Alhajali
- A.E.C.S, Department of Nuclear Engineering, Syrian Arab Republic
| | - S Yousef
- A.E.C.S, Department of Technical service, Syrian Arab Republic
| | - B Naoum
- A.E.C.S, Department of Radiation Protection and Safety, Syrian Arab Republic
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28
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Yousef S, Benden C, Boyer D, Elidemir O, Frischer T, Goldfarb S, Lopez-Mitnik G, Mallory G, Visner G, Westall G, Schecter MG. Lung transplantation in children following bone marrow transplantation: a multi-center experience. Pediatr Transplant 2013; 17:231-6. [PMID: 23217003 DOI: 10.1111/petr.12023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/02/2012] [Indexed: 12/19/2022]
Abstract
Allogenic BMT has been successfully performed as a treatment for hematologic diseases with an expected long-term survival. This survival is truncated by respiratory complications including airway obstruction especially BO. Chronic GVHD has been reported to precede almost all cases reported. LTx has become a therapeutic life-saving option for patients with end-stage lung disease that maybe offered for the treatment of GVHD. We report a multi-center experience of pediatric LTx following BMT in 11 patients age- and gender-matched with 11 controls who received LTx for end-stage lung disease secondary to CF. Overall death was 36.4% over a follow-up period of 19 months (range 3-36 months) for the cases and 27.3% for the control group followed for 17 months (range 8-32 months). Median FEV1 one yr post-transplant for the cases was 78% predicted compared with 67.3% predicted for the controls. The median for episodes of infection was comparable at a median of one episode per patient through the entire follow-up period among both groups. Acute rejection episodes were significantly higher in the control group with a median of one episode per patient in the control group compared to none within the cases. Our data suggest that LTx may be a valuable therapeutic option for children with end-stage lung disease post-BMT with comparable survival outcome to that after LTx in children for other indications such as CF. Hospital stay was significantly longer in our case group. Infection rate was comparable between groups albeit type of infection varied. Significantly and of interest is that acute rejection episodes were non-existent in these cases.
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Affiliation(s)
- S Yousef
- Division of Pediatric Pulmonology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA.
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Abstract
In spite of the fact that Basalt is a widespread type of rock, there is very little available information on using it as aggregates for concrete radiation shielding. This paper investigates the possibility of using Basalt for the aforementioned purpose. The results have shown that Basalt could be used successfully for preparing radiation shielding concrete, but some attention should be paid to the choice of the suitable types of Basalt and for the neutron activation problem that could arise in the concrete shield.
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Affiliation(s)
- S Alhajali
- Department of Nuclear Engineering, A.E.C.S., PO Box 6091, Damascus, Syria.
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Yousef S, Adem A, Eapen V, Zoubeidi T, Kosanovic M, Mabrouk AA. SP4-26 Burden of toxic metal exposure among school-aged children in United Arab Emirates. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976p.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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31
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Kharita M, Yousef S, AlNassar M. Review on the addition of boron compounds to radiation shielding concrete. Progress in Nuclear Energy 2011. [DOI: 10.1016/j.pnucene.2010.09.012] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mousa HSA, Yousef S, Riccardo F, Zeidan W, Sabatinelli G. Hyperglycaemia, hypertension and their risk factors among Palestine refugees served by UNRWA. East Mediterr Health J 2010; 16:609-614. [PMID: 20799587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
UNRWA's noncommunicable disease screening activities were evaluated among 7762 refugees screened for hypertension and type 2 diabetes in Jordan, Syrian Arab Republic, Lebanon, Gaza Strip and West Bank in June 2007. People were referred for screening most commonly because of age (both sexes), followed by smoking (males) and family history (females). Atotal of 9% ofscreened people were diagnosed with hypertension/ diabetes. Being older than 40 years, obese or with a positive family history of diabetes or cardiovascular disease increased the risk of presenting with hypertension and/or hyperglycaemia 3.5, 1.6 and 1.2 times respectively. Differences in risk factor detection and screening outcome in relation to differences in lifestyle are discussed.
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Affiliation(s)
- H S A Mousa
- Department of Health, Headquarters, United Nations Relief and Works Agency for Palestine Refugees in the Near East, Amman, Jordon
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Mousa H, Yousef S, Riccardo F, Zeidan W, Sabatinelli G. Hyperglycaemia, hypertension and their risk factors among Palestine refugees served by UNRWA. East Mediterr Health J 2010. [DOI: 10.26719/2010.16.6.609] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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34
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Suman H, Kharita MH, Yousef S. Assessment of public doses due to a neutron calibration bunker. Radiat Prot Dosimetry 2010; 138:340-345. [PMID: 19946121 DOI: 10.1093/rpd/ncp275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this work, the expected neutron and gamma doses in the populated areas outside the newly constructed neutron calibration bunker at the Atomic Energy Commission of Syria will be assessed using the Monte Carlo code MCNP-4C2. The results showed that the maximum ambient dose equivalent rate (neutrons and gammas) outside the bunker would not exceed 0.5 microSv h(-1), assuming an Am-Be neutron source of emission rate of 10(8) n s(-1). The neutron dose is approximately 10 times higher than the photon dose. Sky shine contributes by about 25-50% of the neutron dose and 7-27% of the gamma dose, depending on the location. The simulation uncertainty due to the possible variations in the simulation parameters has been given particular importance.
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Affiliation(s)
- H Suman
- Radiological and Nuclear Regulatory Office, Atomic Energy Commission, Damascus ,PO Box 6091, Syria
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Yousef S, Benden C, Frischer T, Westall G, Goldfarb S, Ballman M, Aurora P, Doherty G, Boyer D, Visner G. 201: Lung Transplantation in Children after Hematopoietic Stem-Cell Transplantation. J Heart Lung Transplant 2010. [DOI: 10.1016/j.healun.2009.11.212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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36
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Kharita M, Yousef S, AlNassar M. The effect of carbon powder addition on the properties of hematite radiation shielding concrete. Progress in Nuclear Energy 2009. [DOI: 10.1016/j.pnucene.2008.10.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Alhajali S, Kharita M, Naoom B, Yousef S, AlNassar M. Estimation of the activation of local reactor shielding concretes. Progress in Nuclear Energy 2009. [DOI: 10.1016/j.pnucene.2008.04.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Zamar Akhtar U, Yousef S, Adolphus OS. Relapsing life threatening community acquired pneumonia due to rare Legionella species responsive to ceftriaxone and aztreonam. Afr J Med Med Sci 1998; 27:205-8. [PMID: 10497650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
A 24 year old Saudi housewife was admitted thrice with life threatening community acquired pneumonia. Even though she responded to an initial cocktail of cefriaxone, erythromcin, rifampicin and flucloxacillin during the second admission, she relapsed within four days of discharge when she was on erythromycin only. During the third admission she was put on ceftriaxone and aztreonam and recovered fully without any relapse. Serology results received later showed Legionella IgM titres of more than 1:256 for Legionella micdadei and Legionella bozemanii, and IgG titres of Legionella hackeliae. This case demonstrates relapsing pneumonia due to Legionella micdadei and bozemanii infection, and previous exposure to Legionella hackeliae. Both species, that is, Legionella micdadei and bozemanii, are resistant to erythromycin, but responded very well to a combination of ceftriaxone and aztreonam have not been used previously for the treatment of Legionnaires diseases.
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Affiliation(s)
- U Zamar Akhtar
- Department of Internal Medicine, North West Armed Forces Hospitals Programme, Tabuk, Saudi Arabia
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Maurage C, Brochu P, Garel L, Yousef S, Seidman EG, Weber AM, Morin CL, Roy CC. Portoenterostomy in a case of Alagille's syndrome with extrahepatic biliary atresia. J Pediatr Surg 1991; 26:111-3. [PMID: 2005516 DOI: 10.1016/0022-3468(91)90445-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- C Maurage
- Department of Pediatrics, Hôpital Ste-Justine, Montreal, Quebec
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