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Eckert B, Aschauer S, Huth M, Majewski P, Soltau H, Strüder L. How to Count Electrons with Pixelated Semiconductor Detectors. Microsc Microanal 2023; 29:705-706. [PMID: 37613167 DOI: 10.1093/micmic/ozad067.347] [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] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- B Eckert
- PNDetector GmbH, München, Germany
- University of Siegen, Department of Physics, Siegen, Germany
| | | | - M Huth
- PNDetector GmbH, München, Germany
| | | | - H Soltau
- PNDetector GmbH, München, Germany
| | - L Strüder
- University of Siegen, Department of Physics, Siegen, Germany
- PNSensor GmbH, München, Germany
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2
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Huth M, Eckert B, Aschauer S, Hedley E, Nellist P, Majewski P, Strüder L, Soltau H. Combine 4D STEM and EELS Using a Fast Pixelated Direct Detector with Center Hole. Microsc Microanal 2023; 29:401-402. [PMID: 37613060 DOI: 10.1093/micmic/ozad067.188] [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] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- M Huth
- PNDetector GmbH, München, Germany
| | - B Eckert
- PNDetector GmbH, München, Germany
- University of Siegen, Department of Physics, Siegen, Germany
| | | | - E Hedley
- University of Oxford, Department of Materials, Oxford, United Kingdom
| | - P Nellist
- University of Oxford, Department of Materials, Oxford, United Kingdom
| | | | - L Strüder
- University of Siegen, Department of Physics, Siegen, Germany
- PNSensor GmbH, München, Germany
| | - H Soltau
- PNDetector GmbH, München, Germany
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3
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Molano JC, Xing K, Majewski P, Huang B. A holistic reverse logistics planning framework for end-of-life PV panel collection system design. J Environ Manage 2022; 317:115331. [PMID: 35636104 DOI: 10.1016/j.jenvman.2022.115331] [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: 01/08/2022] [Revised: 05/08/2022] [Accepted: 05/14/2022] [Indexed: 06/15/2023]
Abstract
Photovoltaic (PV) technologies are critical for sustainable energy supply, climate change mitigation, and energy security with lower environmental impact compared to other generation alternatives. Despite the environmental benefits of PV technologies, one of these major downsides is the growing concern over the environmental impact due to risks associated with improper waste handling and disposal of decommissioned PV panels. As a result, there are strong incentives for PV panel recycling to recover valuable resources and mitigate risks caused by hazardous substances. This study proposes a reverse logistical planning framework for collecting end-of-life PV panels, which aims to support the integration of existing recycling technologies and collection schemes using a holistic approach for ensuring feasibility and reducing environmental impact. The framework reviews current recycling methodologies for PV waste and the state of PV markets, including PV uptake, waste stream forecast, collection and logistic strategies. Additionally, South Australia is used as the context of analysis for a case study where the framework is applied to identify the potential strategies for handling and collection of end-of-life PV panels based on current PV uptake and waste stream forecast. As a result, capital, transportation and operation costs can be reduced, contributing to lower overall recycling cost for the PV waste treatment and a more efficient reverse logistic system.
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Affiliation(s)
| | - Ke Xing
- UniSA STEM, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.
| | - Peter Majewski
- Future Industry Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
| | - Bin Huang
- UniSA STEM, University of South Australia, Mawson Lakes, South Australia, 5095, Australia; School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
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4
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Haseli P, Majewski P, Christo F, Raven M, Klose S, Bruno F. Experimental Kinetic Analysis of Potassium Extraction from Ultrapotassic Syenite Using NaCl-CaCl 2 Salt Mixture. ACS Omega 2020; 5:16421-16429. [PMID: 32685805 PMCID: PMC7364589 DOI: 10.1021/acsomega.0c00549] [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] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
This kinetic experimental analysis reports on the application of a eutectic NaCl-CaCl2 salt system for the extraction of potassium from ultrapotassic microsyenite. The reaction parameters, time, temperature, salt composition, and salt to ore ratio, were systematically analyzed. It was found that a salt mixture increases the potassium cation extraction in comparison with using either pure NaCl or pure CaCl2. It was also found that adding CaCl2 into pure NaCl has a considerably stronger effect on increasing the potassium recovery than adding NaCl to pure CaCl2. The salt as a melting agent offers a reduction in the reaction temperature due to its lower melting temperature when compared to pure salts (NaCl or CaCl2). Approximately 70% of K+ in the deposit was extracted at 650 °C. Different characteristic methods have been used to understand the reaction mechanism of the salt mixture and ore, as well as to qualify and quantify the end product mineral phases.
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Affiliation(s)
- Pegah Haseli
- Academic
Unit STEM, University of South Australia, Mawson Lakes SA, 5095 Adelaide, Australia
| | - Peter Majewski
- Future
Industries Institute, University of South
Australia, Mawson Lakes
SA, 5095 Adelaide, Australia
| | - Farid Christo
- School
of Engineering, Deakin University, Geelong Waurn Ponds Campus Victoria, 3216 Melbourne, Australia
| | - Mark Raven
- Commonwealth
Scientific and Industrial Research Organisation, Urrbrae SA, 5064 Adelaide, Australia
| | - Steve Klose
- Centrex
Metals Limited, Adelaide
SA, 5000 Adelaide, Australia
| | - Frank Bruno
- Future
Industries Institute, University of South
Australia, Mawson Lakes
SA, 5095 Adelaide, Australia
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5
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Rugowska A, Wiernicki B, Maczewski M, Mackiewicz U, Chojnacka K, Bednarek-Rajewska K, Kluk A, Majewski P, Kolanowski T, Malcher A, Rozwadowska N, Kurpisz M. Human skeletal muscle-derived stem/progenitor cells modified with connexin-43 prevent arrhythmia in rat post-infarction hearts and influence gene expression in the myocardium. J Physiol Pharmacol 2020; 70. [PMID: 32203936 DOI: 10.26402/jpp.2019.6.10] [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] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 12/30/2019] [Indexed: 11/03/2022]
Abstract
Stem cell therapy in combination with genetic modification (e.g., transfection with the coding sequence for the connexion 43 gene, GJA1) may solve the problems associated with the occurrence of additional (secondary) stimulation in the post-infarcted heart (arrhythmia). Human skeletal muscle-derived stem/progenitor cells (SkMDS/PCs) were transfected with the pCiNeo-GJA1 plasmid at an efficiency of approximately 96%. Gene overexpression was assessed using qPCR, and subsequent analysis revealed that GJA1 expression increased more than 40-fold in SkMDS/PCs transfected with the appropriate coding sequence (SkMDS/PCsCX43) compared to that of the 'native' SkMDS/PCs control (SkMDS/PCsWT). Enhanced (4-fold) protein expression of connexin-43 was also confirmed by Western immunoblotting. Furthermore, using the arrhythmic score, we demonstrated the positive effects of SkMDS/PCsCX43 cell intervention in reducing additional secondary stimulations in rat post-infarcted hearts compared with that of wild-type cell delivery. Selected gene responses (Kcnq1, Cacna1c, Ncx1, Serca2a, and Tgfb1) showed significantly altered expression profiles in the rat myocardium upon intervention with SkMDS/PCsCX43. The genetic modification of human skeletal muscle-derived stem/progenitor cells with connexin-43 prevented the pro-arrhythmic effects of myogenic implanted stem cells on the host myocardium and positively influenced myocardial gene expression profiles in respect to myocardium conductivity.
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Affiliation(s)
- A Rugowska
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - B Wiernicki
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - M Maczewski
- Department of Clinical Physiology, Centre for Postgraduate Medical Education, Warsaw, Poland
| | - U Mackiewicz
- Department of Clinical Physiology, Centre for Postgraduate Medical Education, Warsaw, Poland
| | - K Chojnacka
- Department of Clinical Pathology, Heliodor Swiecicki Clinical Hospital No. 2, Poznan University of Medical Sciences
| | - K Bednarek-Rajewska
- Department of Clinical Pathology, Poznan University of Medical Sciences, Poznan, Poland
| | - A Kluk
- Department of Clinical Pathology, Poznan University of Medical Sciences, Poznan, Poland
| | - P Majewski
- Department of Clinical Pathology, Poznan University of Medical Sciences, Poznan, Poland
| | - T Kolanowski
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - A Malcher
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - N Rozwadowska
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - M Kurpisz
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.
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Haseli P, Majewski P, Christo FC, Hammond B, Bruno F. Thermochemical and Experimental Kinetic Analysis of Potassium Extraction from Ultrapotassic Syenite Using Molten Chloride Salts. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b06328] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- P. Haseli
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - P. Majewski
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - F. C. Christo
- Deakin University, Melbourne, Victoria 3216, Australia
| | - B. Hammond
- Centrex Metals Limited, Adelaide, South Australia 5000, Australia
| | - F. Bruno
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
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7
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Amaudruz PA, Baldwin M, Batygov M, Beltran B, Bina CE, Bishop D, Bonatt J, Boorman G, Boulay MG, Broerman B, Bromwich T, Bueno JF, Burghardt PM, Butcher A, Cai B, Chan S, Chen M, Chouinard R, Cleveland BT, Cranshaw D, Dering K, DiGioseffo J, Dittmeier S, Duncan FA, Dunford M, Erlandson A, Fatemighomi N, Florian S, Flower A, Ford RJ, Gagnon R, Giampa P, Golovko VV, Gorel P, Gornea R, Grace E, Graham K, Gulyev E, Hakobyan R, Hall A, Hallin AL, Hamstra M, Harvey PJ, Hearns C, Jillings CJ, Kamaev O, Kemp A, Kuźniak M, Langrock S, La Zia F, Lehnert B, Lidgard JJ, Lim C, Lindner T, Linn Y, Liu S, Majewski P, Mathew R, McDonald AB, McElroy T, McGinn T, McLaughlin JB, Mead S, Mehdiyev R, Mielnichuk C, Monroe J, Muir A, Nadeau P, Nantais C, Ng C, Noble AJ, O'Dwyer E, Ohlmann C, Olchanski K, Olsen KS, Ouellet C, Pasuthip P, Peeters SJM, Pollmann TR, Rand ET, Rau W, Rethmeier C, Retière F, Seeburn N, Shaw B, Singhrao K, Skensved P, Smith B, Smith NJT, Sonley T, Soukup J, Stainforth R, Stone C, Strickland V, Sur B, Tang J, Taylor J, Veloce L, Vázquez-Jáuregui E, Walding J, Ward M, Westerdale S, Woolsey E, Zielinski J. First Results from the DEAP-3600 Dark Matter Search with Argon at SNOLAB. Phys Rev Lett 2018; 121:071801. [PMID: 30169081 DOI: 10.1103/physrevlett.121.071801] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 05/17/2018] [Indexed: 06/08/2023]
Abstract
This Letter reports the first results of a direct dark matter search with the DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing a large target mass, with the LAr target contained in a spherical acrylic vessel of 3600 kg capacity. The LAr is viewed by an array of PMTs, which would register scintillation light produced by rare nuclear recoil signals induced by dark matter particle scattering. An analysis of 4.44 live days (fiducial exposure of 9.87 ton day) of data taken during the initial filling phase demonstrates the best electronic recoil rejection using pulse-shape discrimination in argon, with leakage <1.2×10^{-7} (90% C.L.) between 15 and 31 keV_{ee}. No candidate signal events are observed, which results in the leading limit on weakly interacting massive particle (WIMP)-nucleon spin-independent cross section on argon, <1.2×10^{-44} cm^{2} for a 100 GeV/c^{2} WIMP mass (90% C.L.).
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Affiliation(s)
- P-A Amaudruz
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - M Baldwin
- Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, United Kingdom
| | - M Batygov
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
| | - B Beltran
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - C E Bina
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - D Bishop
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - J Bonatt
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - G Boorman
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - M G Boulay
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - B Broerman
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - T Bromwich
- University of Sussex, Sussex House, Brighton, East Sussex BN1 9RH, United Kingdom
| | - J F Bueno
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - P M Burghardt
- Department of Physics, Technische Universität München, 80333 Munich, Germany
| | - A Butcher
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - B Cai
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - S Chan
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - M Chen
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - R Chouinard
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - B T Cleveland
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - D Cranshaw
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - K Dering
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - J DiGioseffo
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - S Dittmeier
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - F A Duncan
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - M Dunford
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - A Erlandson
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
- Canadian Nuclear Laboratories Ltd, Chalk River, Ontario K0J 1J0, Canada
| | - N Fatemighomi
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - S Florian
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - A Flower
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - R J Ford
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - R Gagnon
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - P Giampa
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - V V Golovko
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Canadian Nuclear Laboratories Ltd, Chalk River, Ontario K0J 1J0, Canada
| | - P Gorel
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - R Gornea
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - E Grace
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - K Graham
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - E Gulyev
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - R Hakobyan
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - A Hall
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - A L Hallin
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - M Hamstra
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - P J Harvey
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - C Hearns
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - C J Jillings
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - O Kamaev
- Canadian Nuclear Laboratories Ltd, Chalk River, Ontario K0J 1J0, Canada
| | - A Kemp
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - M Kuźniak
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - S Langrock
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
| | - F La Zia
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - B Lehnert
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - J J Lidgard
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - C Lim
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - T Lindner
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - Y Linn
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - S Liu
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - P Majewski
- Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, United Kingdom
| | - R Mathew
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - A B McDonald
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - T McElroy
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - T McGinn
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - J B McLaughlin
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - S Mead
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - R Mehdiyev
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - C Mielnichuk
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - J Monroe
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - A Muir
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - P Nadeau
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - C Nantais
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - C Ng
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - A J Noble
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - E O'Dwyer
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - C Ohlmann
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - K Olchanski
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - K S Olsen
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - C Ouellet
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - P Pasuthip
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - S J M Peeters
- University of Sussex, Sussex House, Brighton, East Sussex BN1 9RH, United Kingdom
| | - T R Pollmann
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Department of Physics, Technische Universität München, 80333 Munich, Germany
| | - E T Rand
- Canadian Nuclear Laboratories Ltd, Chalk River, Ontario K0J 1J0, Canada
| | - W Rau
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - C Rethmeier
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - F Retière
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - N Seeburn
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - B Shaw
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - K Singhrao
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - P Skensved
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - B Smith
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - N J T Smith
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - T Sonley
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
| | - J Soukup
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - R Stainforth
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - C Stone
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - V Strickland
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - B Sur
- Canadian Nuclear Laboratories Ltd, Chalk River, Ontario K0J 1J0, Canada
| | - J Tang
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - J Taylor
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - L Veloce
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - E Vázquez-Jáuregui
- Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- SNOLAB, Lively, Ontario P3Y 1M3, Canada
- Instituto de Física, Universidad Nacional Autónoma de México, A. P. 20-364, México D. F. 01000, Mexico
| | - J Walding
- Royal Holloway University London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
| | - M Ward
- Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - S Westerdale
- Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - E Woolsey
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - J Zielinski
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
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8
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Moussa M, El-Kady MF, Zhao Z, Majewski P, Ma J. Recent progress and performance evaluation for polyaniline/graphene nanocomposites as supercapacitor electrodes. Nanotechnology 2016; 27:442001. [PMID: 27688234 DOI: 10.1088/0957-4484/27/44/442001] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Polyaniline (PANi)/graphene nanocomposites have attracted tremendous interest because of their great potential in electrochemical energy storage applications, especially supercapacitors. We herein focus on the composite synthesis, device fabrication and particularly various techniques for the improvement of electrochemical performance. It is imperative to take close control of the interface in these nanostructured composites, which thus would lead to the desired synergistic effects and cyclic stability with the efficient diffusion of electrolyte ions and electrons. Challenges and perspectives are discussed for the development of highly efficient PANi/graphene electrodes for supercapacitors.
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Affiliation(s)
- Mahmoud Moussa
- Future Industries Institute and School of Engineering, University of South Australia, Mawson Lakes, SA5095, Australia. Department of Chemistry, Faculty of Science, Beni-Suef University, Beni-Suef 62111, Egypt
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Chowdhury NR, MacGregor-Ramiasa M, Zilm P, Majewski P, Vasilev K. 'Chocolate' silver nanoparticles: Synthesis, antibacterial activity and cytotoxicity. J Colloid Interface Sci 2016; 482:151-158. [PMID: 27501038 DOI: 10.1016/j.jcis.2016.08.003] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 07/31/2016] [Accepted: 08/01/2016] [Indexed: 12/15/2022]
Abstract
HYPOTHESIS Silver nanoparticles (AgNPs) have emerged as a powerful weapon against antibiotic resistant microorganisms. However, most conventional AgNPs syntheses require the use of hazardous chemicals and generate toxic organic waste. Hence, in recent year's, plant derived and biomolecule based synthetics have has gained much attention. Cacao has been used for years for its medicinal benefits and contains a powerful reducing agent - oxalic acid. We hypothesized that, due to the presence of oxalic acid, cacao extract is capable of reducing silver nitrate (AgNO3) to produce AgNPs. EXPERIMENTS In this study, AgNPs were synthesized by using natural cacao extract as a reducing and stabilizing agent. The reaction temperature, time and reactant molarity were varied to optimize the synthesis yield. FINDINGS UV-visible spectroscopy (UV-vis), dynamic light scattering (DLS) and transmission electron microscopy (TEM) characterization demonstrated that the synthesized AgNPs were spherical particles ranging in size from 35 to 42.5nm. The synthesized AgNPs showed significant antibacterial activity against clinically relevant pathogens such as Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Staphylococcus epidermidis. Importantly, these green AgNPs are not cytotoxic to human dermal fibroblasts (HDFs) at concentrations below 32μg/ml. We conclude that cacao-based synthesis is a reproducible and sustainable method for the generation of stable antimicrobial silver nanoparticles with low cytotoxicity to human cells. The AgNPs synthesized in this work have promising properties for applications in the biomedical field.
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Affiliation(s)
- Neelika Roy Chowdhury
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia.
| | | | - Peter Zilm
- Microbiology Laboratory, The School of Dentistry, The University of Adelaide, Adelaide, SA 5005, Australia.
| | - Peter Majewski
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia.
| | - Krasimir Vasilev
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia.
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Cavallaro A, Mierczynska A, Barton M, Majewski P, Vasilev K. Influence of immobilized quaternary ammonium group surface density on antimicrobial efficacy and cytotoxicity. Biofouling 2016; 32:13-24. [PMID: 26691649 DOI: 10.1080/08927014.2015.1115977] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Bacterial colonization of medical devices causes infections and is a significant problem in healthcare. The use of antibacterial coatings is considered as a potential solution to this problem and has attracted a great deal of attention. Using concentration density gradients of immobilized quaternary ammonium compounds it was demonstrated that a specific threshold of surface concentration is required to induce significant bacterial death. It was determined that this threshold was 4.18% NR4(+) bonded nitrogen with a surface potential of + 120.4 mV. Furthermore, it is shown for the first time that adhesion of constituents of the culture medium to the quaternary ammonium modified surface eliminated any cytotoxicity towards eukaryotic cells such as primary human fibroblasts. The implications of this type of surface fouling on the antimicrobial efficacy of surface coatings are also discussed.
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Affiliation(s)
- Alex Cavallaro
- a School of Engineering , University of South Australia , Adelaide, South Australia , Australia
| | | | - Mary Barton
- c School of Pharmacy and Medical Sciences , University of South Australia , Adelaide, South Australia , Australia
| | - Peter Majewski
- a School of Engineering , University of South Australia , Adelaide, South Australia , Australia
| | - Krasimir Vasilev
- a School of Engineering , University of South Australia , Adelaide, South Australia , Australia
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Taheri S, Cavallaro A, Christo SN, Majewski P, Barton M, Hayball JD, Vasilev K. Antibacterial Plasma Polymer Films Conjugated with Phospholipid Encapsulated Silver Nanoparticles. ACS Biomater Sci Eng 2015; 1:1278-1286. [PMID: 33429675 DOI: 10.1021/acsbiomaterials.5b00338] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Medical device associated infections are a persistent medical problem which has not found a comprehensive solution yet. Over the last decades, there have been intense research efforts toward developing antibacterial coatings that could potentially improve medical outcomes. Silver nanoparticles have attracted a great deal of attention as a potent alternative to conventional antibiotics. Herein, we present a biologically inspired approach to synthesize phospholipid encapsulated silver nanoparticles and their surface immobilization to a functional plasma polymer interlayer to generate antibacterial coatings. The antibacterial efficacy of the coatings was evaluated against three medically relevant pathogens including the Gram-positive Staphylococcus aureus and Staphylococcus epidermidis, and the Gram-negative Pseudomonas aeruginosa. The innate immune response to the coatings was assessed in vitro using primary bone marrow derived macrophages (BMDM). Any potential cytotoxicity was studied with primary human dermal fibroblasts (HDFs). Overall, the coatings had excellent inhibition of bacterial growth. We also observed reduced expression of pro-inflammatory cytokines from BMDM which suggests a reduced inflammatory response. The combined properties of coatings developed in this study may make them a good candidate for application on medical devices such as catheters and wound dressings.
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Affiliation(s)
- Shima Taheri
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Alex Cavallaro
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Susan N Christo
- Sansom Institute, University of South Australia, Adelaide, SA 5000, Australia
| | - Peter Majewski
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Mary Barton
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - John D Hayball
- Sansom Institute, University of South Australia, Adelaide, SA 5000, Australia.,School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Krasimir Vasilev
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia
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Abstract
Carbon nanomaterials including carbon black (CB), carbon nanotubes (CNTs) and graphene have attracted increasingly more interest in academia due to their fascinating properties. These nanomaterials can significantly improve the mechanical, electrical, thermal, barrier, and flame retardant properties of elastomers. The improvements are dependent on the molecular nature of the matrix, the intrinsic property, geometry and dispersion of the fillers, and the interface between the matrix and the fillers. In this article, we briefly described the fabrication processes of elastomer composites, illuminated the importance of keeping fillers at nanoscale in matrices, and critically reviewed the recent development of the elastomeric composites by incorporating CB, CNTs, and graphene and its derivatives. Attention has been paid to the mechanical properties and electrical and thermal conductivity. Challenges and further research are discussed at the end of the article.
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Affiliation(s)
- Sherif Araby
- School of Engineering, University of South Australia, SA5095, Australia. Department of Mechanical Engineering, Faculty of Engineering, Benha University, Egypt
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Abstract
Highly negatively charged particles were fabricated via an innovative plasma-assisted approach for the removal of heavy metal ions. Thiophene plasma polymerization was used to deposit sulfur-rich films onto silica particles followed by the introduction of oxidized sulfur functionalities, such as sulfonate and sulfonic acid, via water-plasma treatments. Surface chemistry analyses were conducted by X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectroscopy. Electrokinetic measurements quantified the zeta potentials and isoelectric points (IEPs) of modified particles and indicated significant decreases of zeta potentials and IEPs upon plasma modification of particles. Plasma polymerized thiophene-coated particles treated with water plasma for 10 min exhibited an IEP of less than 3.5. The effectiveness of developed surfaces in the adsorption of heavy metal ions was demonstrated through copper (Cu) and zinc (Zn) removal experiments. The removal of metal ions was examined through changing initial pH of solution, removal time, and mass of particles. Increasing the water plasma treatment time to 20 min significantly increased the metal removal efficiency (MRE) of modified particles, whereas further increasing the plasma treatment time reduced the MRE due to the influence of an ablation mechanism. The developed particulate surfaces were capable of removing more than 96.7% of both Cu and Zn ions in 1 h. The combination of plasma polymerization and oxidative plasma treatment is an effective method for the fabrication of new adsorbents for the removal of heavy metals.
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Affiliation(s)
- Behnam Akhavan
- School of Engineering, Mawson Institute, University of South Australia , Mawson Lakes, SA 5095, Australia
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Abstract
A completely dry method has been introduced for the development of negatively charged oxidized sulfur-terminated particles.
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Affiliation(s)
- Behnam Akhavan
- School of Engineering
- Mawson Institute
- University of South Australia
- Mawson Lakes
- Australia
| | - Karyn Jarvis
- School of Engineering
- Mawson Institute
- University of South Australia
- Mawson Lakes
- Australia
| | - Peter Majewski
- School of Engineering
- Mawson Institute
- University of South Australia
- Mawson Lakes
- Australia
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Taheri S, Baier G, Majewski P, Barton M, Förch R, Landfester K, Vasilev K. Synthesis and surface immobilization of antibacterial hybrid silver-poly(l-lactide) nanoparticles. Nanotechnology 2014; 25:305102. [PMID: 25007946 DOI: 10.1088/0957-4484/25/30/305102] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Infections associated with medical devices are a substantial healthcare problem. Consequently, there has been increasing research and technological efforts directed toward the development of coatings that are capable of preventing bacterial colonization of the device surface. Herein, we report on novel hybrid silver loaded poly(L-lactic acid) nanoparticles (PLLA-AgNPs) with narrowly distributed sizes (17 ± 3 nm) prepared using a combination of solvent evaporation and mini-emulsion technology. These particles were then immobilized onto solid surfaces premodified with a thin layer of allylamine plasma polymer (AApp). The antibacterial efficacy of the PLLA-AgNPs nanoparticles was studied in vitro against both gram-positive (Staphylococcus epidermidis) and gram-negative (Escherichia coli) bacteria. The minimal inhibitory concentration values against Staphylococcus epidermidis and Escherichia coli were 0.610 and 1.156 μg · mL(-1), respectively. The capacity of the prepared coatings to prevent bacterial surface colonization was assessed in the presence of Staphylococcus epidermidis, which is a strong biofilm former that causes substantial problems with medical device associated infections. The level of inhibition of bacterial growth was 98%. The substrate independent nature and the high antibacterial efficacy of coatings presented in this study may offer new alternatives for antibacterial coatings for medical devices.
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Affiliation(s)
- Shima Taheri
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095 Australia
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Majewski P, Salwa-Żurawska W. In memoriam Professor Przemysław Gabryel (01.12.1919 - 27.04.2014). POL J PATHOL 2014; 65:91-92. [PMID: 25119167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023] Open
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Taheri S, Cavallaro A, Christo SN, Smith LE, Majewski P, Barton M, Hayball JD, Vasilev K. Substrate independent silver nanoparticle based antibacterial coatings. Biomaterials 2014; 35:4601-9. [DOI: 10.1016/j.biomaterials.2014.02.033] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 02/20/2014] [Indexed: 12/25/2022]
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Akhavan B, Jarvis K, Majewski P. Development of oxidized sulfur polymer films through a combination of plasma polymerization and oxidative plasma treatment. Langmuir 2014; 30:1444-1454. [PMID: 24428447 DOI: 10.1021/la4045489] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A novel two-step process consisting of plasma polymerization and oxidative plasma treatment is introduced in this article for the first time for the fabrication of -SO(x)(H)-functionalized surfaces. Plasma-polymerized thiophene (PPT) was initially deposited onto silicon wafers and subsequently SO(x)(H)-functionalized using air or oxygen plasma. The effectiveness of both air and oxygen plasma treatments in introducing sulfur-oxygen groups into the PPT film was investigated as the plasma input specific energy and treatment time were varied. The surface chemistries of untreated and treated PPT coatings were analyzed by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectroscopy (ToF-SIMS), whereas spectroscopic ellipsometry was used to evaluate the film thickness and ablation rate. Surface chemistry analyses revealed that high concentrations of -SO(x)(H) functionalities were generated on the surface upon either air or oxygen plasma treatment. It was found that, at low plasma input energies, the oxidation process was dominant whereas, at higher energies, ablation of the film became more pronounced. The combination of thiophene plasma polymerization and air/oxygen plasma treatment was found to be a successful approach to the fabrication of -SO(x)(H)-functionalized surfaces.
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Affiliation(s)
- Behnam Akhavan
- School of Engineering, Mawson Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
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Araby S, Meng Q, Zhang L, Kang H, Majewski P, Tang Y, Ma J. Electrically and thermally conductive elastomer/graphene nanocomposites by solution mixing. POLYMER 2014. [DOI: 10.1016/j.polymer.2013.11.032] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Taheri S, Cavallaro A, Barton M, Whittle JD, Majewski P, Smith LE, Vasilev K. Antibacterial Efficacy and Cytotoxicity of Silver Nanoparticle Based Coatings Facilitated by a Plasma Polymer Interlayer. Plasma Med 2014. [DOI: 10.1615/plasmamed.2014011974] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Taheri S, Baier G, Majewski P, Barton M, Förch R, Landfester K, Vasilev K. Synthesis and antibacterial properties of a hybrid of silver–potato starch nanocapsules by miniemulsion/polyaddition polymerization. J Mater Chem B 2014; 2:1838-1845. [DOI: 10.1039/c3tb21690j] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Akhavan B, Jarvis K, Majewski P. Hydrophobic plasma polymer coated silica particles for petroleum hydrocarbon removal. ACS Appl Mater Interfaces 2013; 5:8563-71. [PMID: 23942510 DOI: 10.1021/am4020154] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In recent years, functionalized hydrophobic materials have attracted considerable interest as oil removal agents. This investigation has applied plasma polymerization as a novel method to develop hydrophobic and oleophilic particles for water purification. 1,7-Octadiene was plasma polymerized onto silica particles using a radio frequency inductively coupled reactor fitted with a rotating chamber. Plasma polymerized 1,7-octadiene (ppOD) films were deposited using plasma power of 40 W and monomer flow rate of 2 sccm, while polymerization time was varied from 5 to 60 min. The surface chemistry of ppOD coated particles was investigated via X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectroscopy, while Washburn capillary rise measurements were applied to evaluate the hydrophobicity and oleophilicity of the particles. The effectiveness of ppOD coated particles for the removal of hydrophobic matter from water was demonstrated by adsorption of motor oil, kerosene, and crude oil. Petroleum hydrocarbon removal was examined by varying removal time and particle mass. The morphology of oil-loaded ppOD coated particles was examined via environmental scanning electron microscopy observations. Increasing the polymerization time increased the concentration of hydrocarbon functionalities on the surface, thus also increasing the hydrophobicity and oil removal efficiency (ORE). The ppOD coated particles have shown to have excellent ORE. These particles were capable of removing 99.0-99.5% of high viscosity motor oil in 10 min, while more than 99.5% of low viscosity crude oil and kerosene was adsorbed in less than 30 s. Plasma polymerization has shown to be a promising approach to produce a new class of materials for a fast, facile, and efficient oil removal.
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Affiliation(s)
- Behnam Akhavan
- School of Engineering, Mawson Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
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Jarvis KL, Majewski P. Influence of film stability and aging of plasma polymerized allylamine coated quartz particles on humic acid removal. ACS Appl Mater Interfaces 2013; 5:7315-7322. [PMID: 23823504 DOI: 10.1021/am401648g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Plasma polymerized allylamine (ppAA) films have been successfully deposited on to the surface of quartz particles via a rotating barrel plasma reactor for humic acid removal. The films were deposited at a power of 25 W, allylamine flow rate of 4.4 sccm and polymerization times of 5 to 60 min. X-ray photoelectron spectroscopy was used to investigate the influence of short-term stirring in water and film age on surface chemistry. Stirring results in a reduction in the nitrogen concentration, which was greatest for shorter polymerization times. Film aging of up to 52 weeks appeared to result in a reduction in the concentration of C-N species. The influence of batch, recycling, and film age on humic acid removal was investigated. Humic acid removal appeared to be reproducible across three separate batches for polymerization times of 20 min or more, which was attributed to film thickness. Recycling of the ppAA films was most successful at pH 11 for up to 4 humic acid removal/regeneration cycles. Successful regeneration at pH 11 was attributed to electrostatic repulsion of the adsorbed humic acid molecules. Decreasing the pH of the regeneration solution reduced the number of successful regeneration cycles due to greater retention of adsorbed humic acid via electrostatic attraction. Film age appears to have minimal effect on humic acid removal where freshly deposited and 52-week-old films removed similar masses of humic acid. Successful production and development of ppAA coated quartz particles has resulted in a functional material that can be incorporated into a water treatment system to improve water quality.
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Affiliation(s)
- Karyn L Jarvis
- Mawson Institute, University of South Australia, Mawson Lakes, South Australia
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Deneke T, Bansmann M, Nentwich K, Krug J, Majewski P, Schmitt R, Muegge A, Mueller P, Shin DI, Schade A. Incidence of silent cerebral lesions using different ablation technologies. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.2806] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Turkowska E, Rai S, Majewski P, Skwarło-Sońta K. Diurnal and seasonal changes in IL-6 and IL-18 gene expression in blood leukocytes of male chickens with experimental peritonitis: the impact of lighting conditions and melatonin. J Anim Feed Sci 2013. [DOI: 10.22358/jafs/66006/2013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Araby S, Zaman I, Meng Q, Kawashima N, Michelmore A, Kuan HC, Majewski P, Ma J, Zhang L. Melt compounding with graphene to develop functional, high-performance elastomers. Nanotechnology 2013; 24:165601. [PMID: 23535387 DOI: 10.1088/0957-4484/24/16/165601] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Rather than using graphene oxide, which is limited by a high defect concentration and cost due to oxidation and reduction, we adopted cost-effective, 3.56 nm thick graphene platelets (GnPs) of high structural integrity to melt compound with an elastomer-ethylene-propylene-diene monomer rubber (EPDM)-using an industrial facility. An elastomer is an amorphous, chemically crosslinked polymer generally having rather low modulus and fracture strength but high fracture strain in comparison with other materials; and upon removal of loading, it is able to return to its original geometry, immediately and completely. It was found that most GnPs dispersed uniformly in the elastomer matrix, although some did form clusters. A percolation threshold of electrical conductivity at 18 vol% GnPs was observed and the elastomer thermal conductivity increased by 417% at 45 vol% GnPs. The modulus and tensile strength increased by 710% and 404% at 26.7 vol% GnPs, respectively. The modulus improvement agrees well with the Guth and Halpin-Tsai models. The reinforcing effect of GnPs was compared with silicate layers and carbon nanotube. Our simple fabrication would prolong the service life of elastomeric products used in dynamic loading, thus reducing thermosetting waste in the environment.
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Affiliation(s)
- Sherif Araby
- School of Engineering, University of South Australia, SA5095, Australia
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Donskow-Łysoniewska K, Majewski P, Brodaczewska K, Jóźwicka K, Doligalska M. Heligmosmoides polygyrus fourth stages induce protection against DSS-induced colitis and change opioid expression in the intestine. Parasite Immunol 2013; 34:536-46. [PMID: 22889318 DOI: 10.1111/pim.12003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Primary exposure of mice to the nematode Heligmosomoides polygyrus infection reduces inflammation in an experimental model of colitis. The aim of the present investigation was to evaluate whether the reduced inflammation provoked by H. polygyrus L4 larvae in BALB/c mice treated with dextran sulphate sodium is associated with changed expression of opioids in the small intestine and colon. Colitis was induced by 5% Dextran sulphate sodium (DSS) oral administration for 3 days before oral infection with 200 infective larvae (L3) H. polygyrus until the end of the experiment, 6 days post-infection. Clinical disease symptoms were monitored daily. The expressions of proopiomelanocortin POMC1, MOR1 (Oprm1) - opioid receptor and β-endorphin were determined by RT-PCR, Western blot and immunoassay, respectively, in the colon and small intestine of mice. RT-PCR analysis of colon tissues showed up-regulation of the expression of POMC and MOR1 opioid-dependent genes in mice with DSS-induced colitis. H. polygyrus L4 larvae inhibited DSS-induced colitis symptoms that were correlated with increased IL-1β, TNF-α, IL-6, myeloperoxidase (MPO) concentration, macrophages infiltration and MOR1, POMC and β-endorphin increased expression in the small intestine and inhibition of those in the colon.
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Anishur Rahman ATM, Majewski P, Vasilev K. Gd2O3nanoparticles: size-dependent nuclear magnetic resonance. Contrast Media Mol Imaging 2012; 8:92-5. [DOI: 10.1002/cmmi.1481] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | - Peter Majewski
- School AME; University of South Australia; Mawson Lakes SA-5095 Australia
| | - Krasimir Vasilev
- School AME; University of South Australia; Mawson Lakes SA-5095 Australia
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Kumari P, Rickard H, Majewski P. Deposition of silver and gold nanoparticles on surface engineered silica particles and their potential applications. J Nanosci Nanotechnol 2012; 12:8001-8007. [PMID: 23421170 DOI: 10.1166/jnn.2012.6655] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study focuses the attachment of gold and silver nanoparticles on commercial micron sized silica particles. The silica was functionalized with amine groups by a commercial silane surfactant and a layer-by-layer process employing polyelectrolytes, respectively. The nanoparticles were produced by conventional water based processes and the nanoparticles were functionalised by poly acrylic acid. The chemical analysis and X-ray photoelectron spectrometry clearly shows that the gold and silver nanoparticles can be attached to the functionalized silica by the used approaches. However, silane functionalized silica appears to result in a much more efficient uptake of the nanoparticles compared to layer-by-layer functionalized silica. 99% of gold and silver nanoparticle could be recovered and attached to the surface of the silane functionalized silica resulting in a concentration of 0.89 micromolAg/gSES (0.096 mgAg/gSES) and 1.53 micromolAu/gSES (0.301 mgAu/gSES) on the surface of the silica particles. The silver and gold coated silica particles were used for removal of Escherichia coli bacteria and radio frequency (RF) heating, respectively. The test indicate that the bactericide properties of silver and the RF heating effect of gold nanoparticles can be retained by attaching the nanoparticles to silica.
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Affiliation(s)
- Prity Kumari
- School of Advanced Manufacturing and Mechanical Engineering, Mawson Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
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Jarvis KL, Majewski P. Plasma polymerized allylamine coated quartz particles for humic acid removal. J Colloid Interface Sci 2012; 380:150-8. [DOI: 10.1016/j.jcis.2012.05.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 05/01/2012] [Accepted: 05/02/2012] [Indexed: 11/25/2022]
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Rahman ATMA, Majewski P, Vasilev K. Extraordinary optical transmission: coupling of the Wood-Rayleigh anomaly and the Fabry-Perot resonance. Opt Lett 2012; 37:1742-1744. [PMID: 22627556 DOI: 10.1364/ol.37.001742] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this Letter, we demonstrate for the first time that by combining the effects of the Wood-Rayleigh anomaly (WRA) and the Fabry-Perot (FP) resonance, transmission efficiencies of one-dimensional metallo-dielectric gratings on substrates can be significantly improved compared to when these two phenomena work separately. Results of combining the WRA and the FP resonance can be utilized to eliminate the necessity of using the index matching technique and the core-shell structure for enhancing the performance of extraordinary optical transmission devices. Further, the outcomes of combining the WRA and the FP resonance can elucidate some of the unexplained results in the literature.
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Banasiewicz T, Marciniak R, Paszkowski J, Krokowicz P, Kaczmarek E, Walkowiak J, Szmeja J, Majewski P, Drews M. Pouchitis may increase the risk of dysplasia after restorative proctocolectomy in patients with ulcerative colitis. Colorectal Dis 2012; 14:92-7. [PMID: 21689264 DOI: 10.1111/j.1463-1318.2011.02547.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [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] [Indexed: 12/22/2022]
Abstract
AIM Dysplasia of the pouch mucosa after restorative proctocolectomy is rare. The aim of this study was to establish whether there is a correlation between pouchitis and dysplasia. METHOD A group of 276 patients treated for ulcerative colitis by restorative proctocolectomy between 1984 and 2009 was analysed. The presence or absence of pouchitis and dysplasia within the pouch was evaluated. RESULTS Inflammation was diagnosed in 66 (23.9%) patients, low-grade dysplasia in five (1.8%), high-grade dysplasia in three (1.1%), and cancer in one patient (0.4%). The prevalence of low-grade dysplasia was significantly higher in patients with inflammation than in those without (P < 0.04). High-grade dysplasia was significantly more frequent in pouchitis than in non-inflamed pouches (P < 0.01). Logistic regression analysis suggested that the occurrence of mucosal inflammation increased the risk of low grade dysplasia. CONCLUSION Patients with chronic pouchitis are at risk of dysplasia and require surveillance of the pouch.
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Affiliation(s)
- T Banasiewicz
- Department of General, Gastroenterological and Endocrinological Surgery, Poznan University of Medical Sciences, Poznań, Poland.
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Majewski P, Luong J, Stretton K. The application of surface engineered silica for the treatment of sugar containing wastewater. Water Sci Technol 2012; 65:46-52. [PMID: 22173407 DOI: 10.2166/wst.2011.829] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The removal of sucrose and fructose from water at various high concentrations by surface engineered silica (SES) was studied using dissolved sugar in pure water. The results indicate that sugar at concentrations of up to 800 g/L can be removed by SES at a relatively high dose of 250 to 300 g/L. Based on these results, process water from a soft drink filling station which was contaminated by sugar, flavour components, Escherichia coli, Pseudomonas aeruginosa bacteria and Candida pelliculosa yeast were treated to study the performance of SES using actual process water samples by analysing turbidity, biological oxygen demand (BOD), UV absorption, and various other standard parameters, and microbial tests. The study shows that at a dose of 100 g/L of SES bacterial contamination as well as turbidity, BOD and UV absorption can be significantly reduced. However, the study found the yeast species Candida pelliculosa could not be removed from the water samples.
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Affiliation(s)
- Peter Majewski
- School of Advanced Manufacturing and Mechanical Engineering, Mawson Institute, University of South Australia, Mawson Lakes, Australia.
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Pihut M, Majewski P, Wisniewska G, Reron E. Auriculo-vestibular symptoms related to structural and functional disorders of stomatognatic system. J Physiol Pharmacol 2011; 62:251-256. [PMID: 21673374] [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] [Received: 10/25/2010] [Accepted: 04/12/2011] [Indexed: 05/30/2023]
Abstract
Auriculo-vestibular symptoms are otolaryngological complaints which frequently co-occur with functional disorders of masticatory organ. These symptoms include: earache, plugged ears sensation, sudden hearing impairment, burning pain of the throat, tinnitus, and dizziness. The aim of the study was assessment of co-occurrence of functional disorders of masticatory organ and auriculo-vestibular symptoms, in patients referred for otolaryngological treatment. Forty-two patients aged 24-46 years of both sexes referred for otolaryngological treatment, because of auriculo-vestibular symptoms, were qualified to our study within the framework of research project. After otolaryngological diagnostics (Department of Otolaryngology), these patients were referred for prosthetic consultation to the Department of Dental Prosthetics of Jagiellonian University Medical College. In Otolaryngology Clinic the following specialist examinations were carried out: basic clinical examinations, including otoscopy, tuning fork trials, tonal and verbal audiometry, and tympanometry. These examinations were supplemented with electronystagmometry. On prosthetic consultation, specialist functional investigations of masticatory organ, and electromyographic assessment of the activity of masseter muscles and the anterior part of the temporal muscle, were carried out. Results of the investigation revealed otolarygological causes of the reported symptoms in 30 patients, whereas in 12 patients (out of 42 patients referred for prosthetic consultation), numerous functional disorders of the stomatognathic system were observed. The investigation confirmed the occurrence of functional disorders in patients with auriculo-vestibular symptoms and appropriateness of treatment by a multi-specialist team.
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Affiliation(s)
- M Pihut
- Department of Dental Prosthetics of the Institute of Dentistry, Jagiellonian University Medical College, 4 Montelupich Street, Cracow, Poland.
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Chan CC, Choudhury NR, Majewski P. Fabrication and characterisation of self-assembled monolayers of N-[3-(trimethoxysilyl)propyl]diethylenetriamine on silica particles. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.12.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Anishur Rahman A, Vasilev K, Majewski P. Ultra small Gd2O3 nanoparticles: Absorption and emission properties. J Colloid Interface Sci 2011; 354:592-6. [DOI: 10.1016/j.jcis.2010.11.012] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Revised: 11/02/2010] [Accepted: 11/05/2010] [Indexed: 11/17/2022]
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39
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Kaczmarek E, Lacka K, Jarmolowska-Jurczyszyn D, Sidor A, Majewski P. Changes of B and T lymphocytes and selected apopotosis markers in Hashimoto's thyroiditis. J Clin Pathol 2011; 64:626-30. [DOI: 10.1136/jcp.2010.086553] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [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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40
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Stanisic M, Majewski W, Zurawski J, Lesniewska K, Majewski P. IL-6, TNF-alpha, IL-1-beta arterial wall expression is independent of serum concentration in patients sustaining primary or secondary open vascular reconstructions. INT ANGIOL 2010; 29:496-506. [PMID: 21173731] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
AIM The aim of this study was to assess morphological and immunohistochemical differences in arterial wall inflammation during primary and secondary vascular reconstructions. METHODS Forty patients with lower extremities ischemia underwent vascular reconstruction: Group I included patients undergoing primary vascular reconstruction with 25 minor arterial reconstructive procedures; Group II included patients undergoing secondary reconstruction due to limb ischemia after at least 12 months since first operation (15). Immunohistochemical expression of IL-1-BETA,IL-6,and TNF-alpha in arterial wall was correlated with serum concentration. RESULTS No differences were observed in IL-1-beta, IL-6, TNF-alpha expression among groups (P=0.06, P=0.13, P=0.9). Cytokines expression was not accompanied by the growth of its serum concentrations (P=0.8, P=0.9). IL-6 serum concentration depended on the degree of limb ischemia and was very high in case of critical limb ischemia (P=0.006). Arterial morphology was comparable among the groups. CONCLUSION IL-6, IL-1-BETA, TNF-alpha expression in the arterial wall is comparable in primary and secondary lesions. Serum concentrations of IL-6, IL-1-BETA, TNF-alpha are independent of its arterial wall expression.
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Affiliation(s)
- M Stanisic
- Department of General and Vascular Surgery, Poznan University of Medical Sciences, Dluga 1/2, Poznan, Poland.
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Krasiński Z, Biskupski P, Dzieciuchowicz Ł, Kaczmarek E, Krasińska B, Staniszewski R, Pawlaczyk K, Stanisić M, Majewski P, Majewski W. The Influence of Elastic Components of the Venous Wall on the Biomechanical Properties of Different Veins Used for Arterial Reconstruction. Eur J Vasc Endovasc Surg 2010; 40:224-9. [DOI: 10.1016/j.ejvs.2010.04.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Accepted: 04/10/2010] [Indexed: 10/19/2022]
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Pihut M, Wisniewska G, Majewski P, Gronkiewicz K, Majewski S. Measurement of occlusal forces in the therapy of functional disorders with the use of botulinum toxin type A. J Physiol Pharmacol 2009; 60 Suppl 8:113-116. [PMID: 20400803] [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] [Received: 10/22/2009] [Accepted: 12/18/2009] [Indexed: 05/29/2023]
Abstract
Functional disorders of the stomatognathic system include dysfunctions leading to pathological increase of the occlusal forces generated by mandibular adductors. High values of these forces are the cause of numerous disorders within the masticatory organ such as pathological abrasion of the teeth, tension headaches and pain in the region of the temporomandibular joints. The aim of this study was assessment of occlusal forces in the course of the therapy of painful types of functional disorders with the use of botulinum toxin type A - the drug causing muscle relaxation. The material for the study comprised adult patients aged 24-42 years who presented with a painful type of functional disorders in the University Hospital, Institute of Dentistry Jagiellonian University Medical College in Cracow. The patients were qualified to the study on the basis of the results of specialist functional examination of the masticatory organ in which additionally the VAS (Visual Analogue Scale) was used for pain assessment of the masseters and temporomandibular joints. The measurement of maximal occlusal forces in the examined patients was carried out in all patients in the region of the central incisors and first molars on the both side with the use of a special measuring instrument for dental examination, specially constructed (patent number P 334933). The examinations were performed before the beginning of the treatment, 10 days and 16 weeks after intramuscular administration of botulinum toxin type A at a dosage of 21 mouse units - U for one masseter. The results of the examination of maximal occlusal forces obtained in the first examination, that is, before the beginning of the treatment, markedly exceeded the physiological values. In the control examinations, significant, persistent decrease of the studied forces has been noted.
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Affiliation(s)
- M Pihut
- Chair of Dental Prosthetics, Institute of Dentistry, Jagiellonian University Medical College, Cracow, Poland.
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Gronkiewicz K, Majewski P, Wisniewska G, Pihut M, Loster BW, Majewski S. Experimental research on the possibilities of maintaining thermal conditions within the limits of the physiological conditions during intraoral preparation of dental implants. J Physiol Pharmacol 2009; 60 Suppl 8:123-127. [PMID: 20400805] [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] [Received: 10/22/2009] [Accepted: 12/18/2009] [Indexed: 05/29/2023]
Abstract
The objective of the study was to evaluate the degree of temperature change in the bone, directly adjacent to the implant site during the abutment part of one-piece implants, during procedures involving different cutting techniques. Three different one-piece implants: Osteoplant, Nobel Direct, Q-implant were cut with air-turbine burs after insertion in fresh pig ribs. Tests were performed with a variety of cooling techniques including air and air-liquid coolant. Implants were cut on the occlusal and axial surfaces of the abutment part. The temperature changes were evaluated using thermocouple type K during and after cutting procedures. It was found that regardless of the cutting technique, the temperature of the bone always increased during the cutting procedure. The critical temperature threshold Delta T=10 degrees C (47 degrees C) was always exceeded, when only the air coolant was used, although when the air-water spray coolant was utilized during the cutting procedure, it prevented the temperature to exceed this critical level. The extent of thermal changes in the bone depends on the cutting technique. Constant air-water cooling during the cutting procedure is a recommended technique in order to avoid overheating the implant-bone interface. The dry cutting technique, using only an air coolant, should be avoided as it can induce sufficiently high thermal damage in the bone adjacent to the implant, which leads to compromise of the osteointegration process.
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Affiliation(s)
- K Gronkiewicz
- Institute of Dentistry, Jagiellonian University Medical College, Cracow, Poland.
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Lebedenko VN, Araújo HM, Barnes EJ, Bewick A, Cashmore R, Chepel V, Currie A, Davidge D, Dawson J, Durkin T, Edwards B, Ghag C, Horn M, Howard AS, Hughes AJ, Jones WG, Joshi M, Kalmus GE, Kovalenko AG, Lindote A, Liubarsky I, Lopes MI, Lüscher R, Lyons K, Majewski P, Murphy ASJ, Neves F, da Cunha JP, Preece R, Quenby JJ, Scovell PR, Silva C, Solovov VN, Smith NJT, Smith PF, Stekhanov VN, Sumner TJ, Thorne C, Walker RJ. Limits on the spin-dependent WIMP-nucleon cross sections from the first science run of the ZEPLIN-III experiment. Phys Rev Lett 2009; 103:151302. [PMID: 19905617 DOI: 10.1103/physrevlett.103.151302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 09/03/2009] [Indexed: 05/28/2023]
Abstract
We present new experimental constraints on the WIMP-nucleon spin-dependent elastic cross sections using data from the first science run of ZEPLIN-III, a two-phase xenon experiment searching for galactic dark matter weakly interacting massive particles based at the Boulby mine. Analysis of approximately 450 kg x days fiducial exposure allow us to place a 90%-confidence upper limit on the pure WIMP-neutron cross section of sigma(n)=1.9x10(-2) pb at 55 GeV/c(2) WIMP mass. Recent calculations of the nuclear spin structure based on the Bonn charge-dependent nucleon-nucleon potential were used for the odd-neutron isotopes 129Xe and 131Xe. These indicate that the sensitivity of xenon targets to the spin-dependent WIMP-proton interaction could be much lower than implied by previous calculations, whereas the WIMP-neutron sensitivity is impaired only by a factor of approximately 2.
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Affiliation(s)
- V N Lebedenko
- Blackett Laboratory, Imperial College London, London, United Kingdom
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Wijenayaka AKAR, Colby CB, Atkins GJ, Majewski P. Biomimetic hydroxyapatite coating on glass coverslips for the assay of osteoclast activity in vitro. J Mater Sci Mater Med 2009; 20:1467-1473. [PMID: 19259788 DOI: 10.1007/s10856-009-3718-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2008] [Accepted: 02/13/2009] [Indexed: 05/27/2023]
Abstract
The osteoclast (OC) is the cell type responsible for the resorption of bone. The activity of this cell is important in the aetiology of a large number of skeletal pathologies, and also for the biocompatibility and osseointegration of orthopaedic implant materials. OC mediated acid hydrolysis of calcium phosphate from the bone matrix offers a prime means of studying the biology and activity of this cell type. We have developed a method of coating glass coverslips with a hydroxyapatite (HA)-like mineral, using a biomimetic approach. Hydroxylation followed by formation of a self assembled monolayer (SAM) using the surfactant triethoxysilylpropyl succinic anhydride (TESPSA), allowed biomimetic deposition of HA-like mineral from a simulated body fluid (SBF). The biocompatibility of the TESPSA SAM-HA coated glass coverslips was tested by culturing human mature OC present in samples of giant cell tumour of bone (GCT). Parameters of OC activity were assayed, including F-actin ring formation, release of calcium and formation of osteoclastic resorption pits, confirming that OC were able to attach to and resorb the coated surface. This approach for the preparation of HA coatings on glass coverslips could have wide applicability for the study of osteoclast behaviour in vitro.
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Affiliation(s)
- Asiri K A R Wijenayaka
- Bone Cell Biology Group, Discipline of Orthopaedics and Trauma, University of Adelaide, Adelaide, SA 5005, Australia
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Szkaradkiewicz A, Karpinski T, Majewski P, Andrzejewska E, Zwozdziak B. P226 EBV infection in patients with gastric carcinoma. Int J Antimicrob Agents 2009. [DOI: 10.1016/s0924-8579(09)70445-5] [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: 10/20/2022]
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Thierry B, Al-Ejeh F, Brown MP, Majewski P, Griesser HJ. Immunotargeting of Functional Nanoparticles for MRI detection of Apoptotic Tumor Cells. Adv Mater 2009; 21:541-5. [PMID: 21161977 DOI: 10.1002/adma.200800998] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Affiliation(s)
- Benjamin Thierry
- Ian Wark Research Institute, University of South Australia SA 5095 (Australia)
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El Ali Z, Szczepanek E, Majewski P, Iwanik K, Sowinski J, Grzymislawski M. Single brain metastasis from a minute, well differentiated, but invading beyond the tunica muscularis mucosa rectal carcinoid. Acta Gastroenterol Belg 2009; 72:63-66. [PMID: 19402375] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the case of a 48-year-old woman with small-sized (< 10 mm), highly differentiated, aggressive rectal carcinoid, who developed a solitary distant metastasis to the brain. The primary lesion, initially removed by conventional polypectomy, invaded the mucosa/tunica muscularis mucosa and had positive resection margins. Afterwards, an assessment of 5-hydroxyindoloacetic acid (5-HIAA) 24 h urine excretion revealed a significantly increased level. Thus, a partial rectal resection was performed. Because of constantly elevated carcinoid markers: serum chromogranin A (CGA) and 5-HIAA, a somatostatin receptor scintigraphy was performed, which disclosed a focus of pathological marker accumulation in the left frontal area. The pathological finding after neurosurgical excision was meningioma. An unexpected normalization of the biochemical markers prompted us to verify this diagnosis. The final histopathological report was a well-differentiated neuroendocrine brain metastasis. Our case shows that in well differentiated, of diameter < 10 mm rectal carcinoids, an invasion even beyond the mucosa/tunica muscularis mucosa seems to be an independent factor predicting a malignant metastatic potential of these tumors. Hence, in such cases, behind the endoscopic submucosal resection with ligation device a more radical surgery should be considered. Additionally, a systematic CGA and 5-HIAA follow-up assessment and whole body somatostatin receptor scintigraphy, if necessary, are required.
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Affiliation(s)
- Z El Ali
- Department of Internal Diseases, University of Medical Sciences in Poznan, Poznan, Poland.
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Thierry B, Al-Ejeh F, Khatri A, Yuan Z, Russell PJ, Ping S, Brown MP, Majewski P. Multifunctional core–shell magnetic cisplatin nanocarriers. Chem Commun (Camb) 2009:7348-50. [DOI: 10.1039/b911703b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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