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Newbigging A, Landry N, Brun M, Proctor D, Parker M, Zimmer C, Thorlacius L, Raizman JE, Tsui AKY. New solutions to old problems: A practical approach to identify samples with intravenous fluid contamination in clinical laboratories. Clin Biochem 2024; 127-128:110763. [PMID: 38615787 DOI: 10.1016/j.clinbiochem.2024.110763] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 04/09/2024] [Accepted: 04/11/2024] [Indexed: 04/16/2024]
Abstract
OBJECTIVES Contamination with intravenous (IV) fluids is a common cause of specimen rejection or erroneous results in hospitalized patients. Identification of contaminated samples can be difficult. Common measures such as failed delta checks may not be adequately sensitive nor specific. This study aimed to determine detection criteria using commonly ordered tests to identify IV fluid contamination and validate the use of these criteria. METHODS Confirmed contaminated and non-contaminated samples were used to identify patterns in laboratory results to develop criteria to detect IV fluid contamination. The proposed criteria were implemented at a tertiary care hospital laboratory to assess performance prospectively for 6 months, and applied to retrospective chemistry results from 3 hospitals and 1 community lab to determine feasibility and flagging rates. The algorithm was also tested at an external institution for transferability. RESULTS The proposed algorithm had a positive predictive value of 92 %, negative predictive value of 91 % and overall agreement of 92 % when two or more criteria are met (n = 214). The flagging rates were 0.03 % to 0.07 % for hospital and 0.003 % for community laboratories. CONCLUSIONS The proposed algorithm identified true contamination with low false flagging rates in tertiary care urban hospital laboratories. Retrospective and prospective analysis suggest the algorithm is suitable for implementation in clinical laboratories to identify samples with possible IV fluid contamination for further investigation.
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Affiliation(s)
- Ashley Newbigging
- Department of Laboratory Medicine and Pathology, Faculty of Medicine and Dentistry, College of Health Science, University of Alberta, Edmonton, Alberta, Canada
| | - Natalie Landry
- Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada; Clinical Biochemistry, Diagnostic Services, Shared Health Manitoba, Winnipeg, Manitoba, Canada
| | - Miranda Brun
- Department of Laboratory Medicine and Pathology, Faculty of Medicine and Dentistry, College of Health Science, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada
| | - Dustin Proctor
- Department of Laboratory Medicine and Pathology, Faculty of Medicine and Dentistry, College of Health Science, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada
| | - Michelle Parker
- Department of Laboratory Medicine and Pathology, Faculty of Medicine and Dentistry, College of Health Science, University of Alberta, Edmonton, Alberta, Canada; DynaLIFE Medical Labs, Edmonton, Alberta, Canada
| | - Carmen Zimmer
- Alberta Precision Laboratories, Edmonton, Alberta, Canada
| | - Laurel Thorlacius
- Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada; Clinical Biochemistry, Diagnostic Services, Shared Health Manitoba, Winnipeg, Manitoba, Canada; Departments of Pathology and Biochemistry & Medical Genetics, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Joshua E Raizman
- Department of Laboratory Medicine and Pathology, Faculty of Medicine and Dentistry, College of Health Science, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada
| | - Albert K Y Tsui
- Department of Laboratory Medicine and Pathology, Faculty of Medicine and Dentistry, College of Health Science, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada.
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2
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Shaw JLV, Arnoldo S, Beach L, Bouhtiauy I, Brinc D, Brun M, Collier C, Kostantin E, Fung AWS, Füzéry AK, Huang Y, Kaur S, Knauer M, Labrecque L, Leung F, Shea JL, Thakur V, Thorlacius L, Venner AA, Yip PM, De Guire V. Establishing quality indicators for point of care glucose testing: recommendations from the Canadian Society for Clinical Chemists Point of Care Testing and Quality Indicators Special Interest Groups. Clin Chem Lab Med 2023; 61:1280-1287. [PMID: 37043622 DOI: 10.1515/cclm-2023-0147] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 03/17/2023] [Indexed: 04/14/2023]
Abstract
OBJECTIVES Monitoring quality indicators (QIs) is an important part of laboratory quality assurance (QA). Here, the Canadian Society of Clinical Chemists (CSCC) Point of Care Testing (POCT) and QI Special Interest Groups describe a process for establishing and monitoring QIs for POCT glucose testing. METHODS Key, error prone steps in the POCT glucose testing process were collaboratively mapped out, followed by risk assessment for each step. Steps with the highest risk and ability to detect a non-conformance were chosen for follow-up. These were positive patient identification (PPID) and repeat of critically high glucose measurements. Participating sites were asked to submit aggregate data for these indicators from their site(s) for a one-month period. The PPID QI was also included as part of a national QI monitoring program for which fifty-seven sites submitted data. RESULTS The percentage of POCT glucose tests performed without valid PPID ranged from 0-87%. Sites without Admission-Discharge-Transfer (ADT) connectivity to POCT meters were among those with the highest percentage of POCT glucose tests performed without valid PPID. The percentage repeated critically high glucose measurements ranged from 0-50%, indicating low compliance with this recommendation. A high rate of discordance was also noted when critically high POCT glucose measurements were repeated, demonstrating the importance of repeat testing prior to insulin administration. CONCLUSIONS Here, a process for establishing these QIs is described, with preliminary data for two QIs chosen from this process. The findings demonstrate the importance of QIs for identification and comparative performance monitoring of non-conformances to improve POCT quality.
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Affiliation(s)
- Julie L V Shaw
- Division of Biochemistry, Eastern Ontario Regional Laboratories Association and University of Ottawa, Ottawa, ON, Canada
| | - Saranya Arnoldo
- William Osler Health System, Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Lori Beach
- Pathology and Laboratory Medicine, IWK Health and Dalhousie University, Halifax, NS, Canada
| | - Ihssan Bouhtiauy
- Division of Biochemistry, Vitalite Health Network, Edmundston, NB, Canada
| | - Davor Brinc
- Laboratory Medicine Program, University Health Network, Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Miranda Brun
- Alberta Precision Laboratories and Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
| | - Christine Collier
- Royal Columbian Hospital and Department of Pathology and Laboratory Medicine, University of British Columbia, Westminster, BC, Canada
| | - Elie Kostantin
- Clinical Department of Laboratory Medicine, Cite-de-la-Sante Hospital, Optilab LLL and University of Montreal, Montreal, QC, Canada
| | - Angela W S Fung
- Department of Pathology and Laboratory Medicine, St. Paul's Hospital and University of British Columbia, Vancouver, BC, Canada
| | - Anna K Füzéry
- Alberta Precision Laboratories and Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
| | - Yun Huang
- Kingston Health Sciences, Department of Pathology and Molecular Medicine, Queen's University, Kingston, ON, Canada
| | - Sukhbir Kaur
- Clinical Biochemistry Division, Laboratory Medicine, Saskatchewan Health Authority, Saskatoon, SK, Canada
| | - Michael Knauer
- Pathology and Laboratory Medicine, London Health Sciences and University of Western Ontario, London, ON, Canada
| | - Lyne Labrecque
- Clinical Department of Laboratory Medicine, University of Montreal Hospital Center (CHUM), Montreal, QC, Canada
| | - Felix Leung
- Department of Pathology and Laboratory Medicine, Sinai Health System, Department Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Jennifer L Shea
- Department of Laboratory Medicine, Saint John Regional Hospital, Horizon Health, Department of Pathology, Dalhousie University, St. John, NB, Canada
| | - Vinita Thakur
- Department of Laboratory Medicine, Eastern Health Authority and Memorial University, St. John's, NL, Canada
| | - Laurel Thorlacius
- Clinical Biochemistry, Shared Health and University of Manitoba, Winnipeg, MB, Canada
| | - Allison A Venner
- Alberta Precision Laboratories and Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, AB, Canada
| | - Paul M Yip
- Precision Diagnostics and Therapeutics Program, Sunnybrook Health Sciences Centre, Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Vincent De Guire
- Hospital Maisonneuve-Rosemont, Grappe OPTILAB, Montreal CHUM, Montreal, QC, Canada
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Gérigny O, Pedrotti ML, El Rakwe M, Brun M, Pavec M, Henry M, Mazeas F, Maury J, Garreau P, Galgani F. Characterization of floating microplastic contamination in the bay of Marseille (French Mediterranean Sea) and its impact on zooplankton and mussels. Mar Pollut Bull 2022; 175:113353. [PMID: 35121214 DOI: 10.1016/j.marpolbul.2022.113353] [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: 10/01/2021] [Revised: 01/12/2022] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
Microplastics (MPs) were sampled in three seasons from 2016 to 2018 in the Bay of Marseille, northwestern Mediterranean Sea, adjacent to a highly urbanized area. Six sites were selected according to their different characteristics (river mouth, treatment plants, protected marine area). Surface floating MPs were characterized (number, weight, typology and polymer) as was zooplankton. In addition, mussels were submerged and used to investigate ingestion. Finally, a hydrodynamic model was used to improve understanding of dispersion mechanisms. The annual averages of floating MPs values ranged from 39,217 to 514,817 items/km2. The MPs collected were mainly fragments principally composed of polyethylene and polypropylene. The mean abundance ratio (MPs/zooplankton) was 0.09. On average 87% of mussel pools were contaminated and ingested 18.73 items/100 g of flesh. Two hydrodynamic patterns were identified: the first retaining the MPs in the harbor, and the second dispersing them outside.
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Affiliation(s)
- O Gérigny
- Ifremer, ODE/LITTORAL/LER-PAC, La Seine-sur-Mer, France.
| | - M-L Pedrotti
- Sorbonne Universités, CNRS, UMR 7093, LOV, Villefranche sur mer, France
| | | | - M Brun
- Ifremer, ODE/VIGIES, Nantes, France
| | - M Pavec
- Actimar, Université de Bretagne Occidentale, Brest, France
| | - M Henry
- Ifremer, ODE/LITTORAL/LER-PAC, La Seine-sur-Mer, France
| | - F Mazeas
- Ifremer, REM/RDT/LDCM, Brest, France
| | - J Maury
- Sorbonne Universités, CNRS, UMR 7093, LOV, Villefranche sur mer, France
| | - P Garreau
- Ifremer, Univ. Brest, CNRS UMR 6523, IRD, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, 29280 Plouzané, France
| | - F Galgani
- Ifremer, ODE/LITTORAL/LER-PAC, La Seine-sur-Mer, France
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To M, Raizman JE, Goudreau BL, Higgins T, Brun M, Tsui AKY. Centralization of multisite reagent lot-to-lot validation for Ortho Clinical Vitros chemistry instruments. Clin Biochem 2021; 97:62-66. [PMID: 34343576 DOI: 10.1016/j.clinbiochem.2021.07.017] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 07/07/2021] [Accepted: 07/29/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Reagent lot-to-lot comparisons are recommended by accreditation bodies to ensure that the performance of each reagent lot meets acceptable standards for quality patient results. The general approach is comprised of performing quality control (QC) and patient comparison between the old and new reagent lots and evaluating against a pre-defined criteria. Reagent lot comparison practices are often variable despite using the same instrument across different laboratories. This is costly, time consuming, and can lead to variability in acceptance criteria. While Clinical & Laboratory Standards Institute (CLSI) has a recommended guideline for reagent lot validation, it is often difficult to execute for small and rural laboratories due to limited resources. Defining the analytes required for detailed validation is important to allocate appropriate resources to ensure quality patient results. The goal of this study was to develop a standardized approach to reagent lot validation and optimize lab resources on Vitros chemistry instruments. DESIGN AND METHOD This study consists of a retrospective and prospective analysis of reagent lot changes in dry slide chemistry analyzers (Ortho Clinical Diagnostics Vitros). Two years of retrospective reagent lot comparison data was obtained at a single site. A prospective study was conducted by assessing aliquots of 10 patient sample pools at 9 sites with Vitros analyzers. RESULTS Of the 19 chemistry analytes evaluated, albumin, sodium, and total protein showed significant differences between reagent lots and also exceeded the pre-defined acceptance criteria. CONCLUSION For these analytes, our recommendations are to perform a comprehensive lot validation with QC and patient samples. A simple lot validation with a reflex approach comprised of initially assaying QC can be adapted for the more stable analytes to allow achieving quality patient result in a resource constraint rural environment.
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Affiliation(s)
- Michelle To
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada
| | - Joshua E Raizman
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada
| | | | - Trefor Higgins
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada
| | - Miranda Brun
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada
| | - Albert K Y Tsui
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada; Alberta Precision Laboratories, Edmonton, Alberta, Canada.
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5
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Brun M, Füzéry AK, Henschke B, Rozak K, Venner AA. Identifying sources of error and selecting quality indicators for point of care testing. Pract Lab Med 2021; 25:e00216. [PMID: 33869709 PMCID: PMC8042172 DOI: 10.1016/j.plabm.2021.e00216] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 03/15/2021] [Indexed: 11/27/2022] Open
Abstract
Objectives Point of Care Testing (POCT) is a rapidly expanding area of clinical laboratory testing and quality assurance is an important area of focus. Quality indicators (QIs) are a quality management system tool that monitors aspects of the testing process to help meet the challenges associated with maintaining high quality patient safety given the growth in POCT. Alberta aims to formalize the development and use of QIs for POCT. Design and Methods: Potential QIs were identified by reviewing both the current standards and guidelines for QIs in POCT, and the research regarding quality and sources of error in POCT. Quality practices and potential sources of error in POCT were identified by: 1) a Canadian national survey on POCT, and 2) direct observation in two local POCT programs. Results A proposed selection of QIs in POCT were identified by incorporating the results from these investigations, while considering the unique characteristics of POCT. These QIs monitor the preanalytical, analytical, and post-analytical phases of testing, and support processes. Conclusions As POCT volumes and test menu expands, QIs will be a vital tool in monitoring error and maintaining high quality of results. Adoption of formal QIs will support continuous quality improvement and improved patient care.
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Affiliation(s)
- Miranda Brun
- Department of Laboratory Medicine and Pathology, Faculty of Medicine, University of Alberta, Edmonton, AB, Canada.,Alberta Precision Laboratories, AB, Canada
| | - Anna K Füzéry
- Department of Laboratory Medicine and Pathology, Faculty of Medicine, University of Alberta, Edmonton, AB, Canada.,Alberta Precision Laboratories, AB, Canada
| | - Bailey Henschke
- Department of Laboratory Medicine and Pathology, Faculty of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Kallie Rozak
- Department of Laboratory Medicine and Pathology, Faculty of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Allison A Venner
- Alberta Precision Laboratories, AB, Canada.,Department of Pathology and Laboratory Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
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6
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Coutard JG, Brun M, Fournier M, Lartigue O, Fedeli F, Maisons G, Fedeli JM, Nicoletti S, Carras M, Duraffourg L. Volume Fabrication of Quantum Cascade Lasers on 200 mm-CMOS pilot line. Sci Rep 2020; 10:6185. [PMID: 32277096 PMCID: PMC7148313 DOI: 10.1038/s41598-020-63106-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 03/17/2020] [Indexed: 11/17/2022] Open
Abstract
The manufacturing cost of quantum cascade lasers is still a major bottleneck for the adoption of this technology for chemical sensing. The integration of Mid-Infrared sources on Si substrate based on CMOS technology paves the way for high-volume low-cost fabrication. Furthermore, the use of Si-based fabrication platform opens the way to the co-integration of QCL Mid-InfraRed sources with SiGe-based waveguides, enabling realization of optical sensors fully integrated on planar substrate. We report here the fabrication and the characterization of DFB-QCL sources using top metal grating approach working at 7.4 µm fully implemented on our 200 mm CMOS pilot line. These QCL featured threshold current density of 2.5 kA/cm² and a linewidth of 0.16 cm−1 with a high fabrication yield. This approach paves the way toward a Mid-InfraRed spectrometer at the silicon chip level.
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Affiliation(s)
- J G Coutard
- Univ. Grenoble Alpes, CEA, LETI, F38054, Grenoble, France
| | - M Brun
- mirSense - Centre d'intégration NanoINNOV, Bâtiment 863, 8 avenue de la Vauve, F91120, Palaiseau, France
| | - M Fournier
- Univ. Grenoble Alpes, CEA, LETI, F38054, Grenoble, France
| | - O Lartigue
- Univ. Grenoble Alpes, CEA, LETI, F38054, Grenoble, France
| | - F Fedeli
- Univ. Grenoble Alpes, CEA, LETI, F38054, Grenoble, France
| | - G Maisons
- mirSense - Centre d'intégration NanoINNOV, Bâtiment 863, 8 avenue de la Vauve, F91120, Palaiseau, France
| | - J M Fedeli
- Univ. Grenoble Alpes, CEA, LETI, F38054, Grenoble, France
| | - S Nicoletti
- Univ. Grenoble Alpes, CEA, LETI, F38054, Grenoble, France
| | - M Carras
- mirSense - Centre d'intégration NanoINNOV, Bâtiment 863, 8 avenue de la Vauve, F91120, Palaiseau, France
| | - L Duraffourg
- Univ. Grenoble Alpes, CEA, LETI, F38054, Grenoble, France.
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7
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Halioua B, Pham T, Sokol H, Pourcel G, Brun M, Mary K, Pain E, Testa D. Considérations nutritionnelles dans les maladies auto-immunes : quels impacts sur la prise en charge des patients ? NUTR CLIN METAB 2020. [DOI: 10.1016/j.nupar.2020.02.393] [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: 10/24/2022]
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8
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Nieves MJ, Brun M. Dynamic characterization of a periodic microstructured flexural system with rotational inertia. Philos Trans A Math Phys Eng Sci 2019; 377:20190113. [PMID: 31474207 PMCID: PMC6732371 DOI: 10.1098/rsta.2019.0113] [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] [Accepted: 06/26/2019] [Indexed: 06/10/2023]
Abstract
We consider the propagation of waves in a flexural medium composed of massless beams joining a periodic array of elements, elastically supported and possessing mass and rotational inertia. The dispersion properties of the system are determined and the influence and interplay between the dynamic parameters on the structure of the pass and stop bands are analysed in detail. We highlight the existence of three special dynamic regimes corresponding to a low stiffness in the supports and/or low rotational inertia of the masses; to a high stiffness and/or high rotational inertia regime; and to a transition one where dispersion degeneracies are encountered. In the low-frequency regime, a rigorous asymptotic analysis shows that the structure approximates a continuous Rayleigh beam on an elastic foundation. This article is part of the theme issue 'Modelling of dynamic phenomena and localization in structured media (part 1)'.
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Affiliation(s)
- M. J. Nieves
- School of Computing and Mathematics, Keele University, Keele ST5 5BG, UK
- Department of Mechanical, Chemical and Material Engineering, University of Cagliari, Cagliari 09123, Italy
| | - M. Brun
- Department of Mechanical, Chemical and Material Engineering, University of Cagliari, Cagliari 09123, Italy
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Gerigny O, Brun M, Fabri MC, Tomasino C, Le Moigne M, Jadaud A, Galgani F. Seafloor litter from the continental shelf and canyons in French Mediterranean Water: Distribution, typologies and trends. Mar Pollut Bull 2019; 146:653-666. [PMID: 31426205 DOI: 10.1016/j.marpolbul.2019.07.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 03/11/2019] [Revised: 07/11/2019] [Accepted: 07/12/2019] [Indexed: 06/10/2023]
Abstract
Seafloor litter has been studied both on the continental shelves (by trawling during 24 years) and in canyons (by ROV) of the French Mediterranean sea Water (FMW). On the continental shelf, mean densities range from 49.63 to 289.01 items/km2. The most abundant categories were plastic, glass/ceramics, metals and textiles. Trend analysis shows a significant increase in plastic quantities during the study period. Plastics accumulate at all depths, with heavier items being found in deeper areas, while the continental slope-break appears as a clean area. The spatial distribution of litter revealed the influence of geomorphologic factors, anthropic activities, shipping route, river inputs. All the canyons are affected by debris but coastal canyons (Ligurian Sea and Corsica) were more impacted than offshore canyons in the Gulf of Lion. The FMW appears to be highly polluted with regard to values found in other areas, but lower than those observed in the Eastern Mediterranean.
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Affiliation(s)
- O Gerigny
- Institut Français de Recherche pour l'Exploitation de la MER (Ifremer), Centre Méditerranée, LER/PAC, France.
| | - M Brun
- Institut Français de Recherche pour l'Exploitation de la MER (Ifremer), Centre Atlantique, VIGIES, France
| | - M C Fabri
- Institut Français de Recherche pour l'Exploitation de la MER (Ifremer), Centre Méditerranée, LER/PAC, France
| | - C Tomasino
- Institut Français de Recherche pour l'Exploitation de la MER (Ifremer), Centre Méditerranée, LER/PAC, France
| | - M Le Moigne
- Institut Français de Recherche pour l'Exploitation de la MER (Ifremer), Centre Atlantique, VIGIES, France
| | - A Jadaud
- MARBEC, Ifremer, Université de Montpellier, CNRS, IRD, Sète, France
| | - F Galgani
- Institut Français de Recherche pour l'Exploitation de la MER (Ifremer), Centre Méditerranée, LER/PAC, France
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Subra-Paternault P, Harscoat-Schiavo C, Savoire R, Brun M, Velasco J, Ruiz-Mendez V. Utilization of pressurized CO2, pressurized ethanol and CO2-expanded ethanol mixtures for de-oiling spent bleaching earths. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2019.03.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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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Vo TM, Burchett R, Brun M, Monckton EA, Poon HY, Godbout R. Effects of nuclear factor I phosphorylation on calpastatin ( CAST) gene variant expression and subcellular distribution in malignant glioma cells. J Biol Chem 2019; 294:1173-1188. [PMID: 30504225 DOI: 10.1074/jbc.ra118.004787] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Revised: 11/29/2018] [Indexed: 12/20/2022] Open
Abstract
Malignant glioma (MG) is the most lethal primary brain tumor. In addition to having inherent resistance to radiation treatment and chemotherapy, MG cells are highly infiltrative, rendering focal therapies ineffective. Genes involved in MG cell migration and glial cell differentiation are up-regulated by hypophosphorylated nuclear factor I (NFI), which is dephosphorylated by the phosphatase calcineurin in MG cells. Calcineurin is cleaved and thereby activated by calpain proteases, which are, in turn, inhibited by calpastatin (CAST). Here, we show that the CAST gene is a target of NFI and has NFI-binding sites in its intron 3 region. We also found that NFI-mediated regulation of CAST depends on NFI's phosphorylation state. We noted that occupation of CAST intron 3 by hypophosphorylated NFI results in increased activation of an alternative promoter. This activation resulted in higher levels of CAST transcript variants, leading to increased levels of CAST protein that lacks the N-terminal XL domain. CAST was primarily present in the cytoplasm of NFI-hypophosphorylated MG cells, with a predominantly perinuclear immunostaining pattern. NFI knockdown in NFI-hypophosphorylated MG cells increased CAST levels at the plasma membrane. These results suggest that NFI plays an integral role in the regulation of CAST variants and CAST subcellular distribution. Along with the previous findings indicating that NFI activity is regulated by calcineurin, these results provide a foundation for further investigations into the possibility of regulatory cross-talk between NFI and the CAST/calpain/calcineurin signaling pathway in MG cells.
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Affiliation(s)
- The Minh Vo
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada
| | - Rebecca Burchett
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada
| | - Miranda Brun
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada
| | - Elizabeth A Monckton
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada
| | - Ho-Yin Poon
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada
| | - Roseline Godbout
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada.
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Newell M, Brun M, Field CJ. Treatment with DHA Modifies the Response of MDA-MB-231 Breast Cancer Cells and Tumors from nu/nu Mice to Doxorubicin through Apoptosis and Cell Cycle Arrest. J Nutr 2019; 149:46-56. [PMID: 30601995 DOI: 10.1093/jn/nxy224] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Background Docosahexaenoic acid (DHA) has been shown to reduce growth of breast cancer cells in vitro and in vivo; it may also benefit the action of cytotoxic cancer drugs. The mechanisms for these observations are not completely understood. Objectives We sought to explore how pretreatment of MDA-MB-231 breast cancer cells with DHA alters gene expression with doxorubicin (DOX) treatment and confirm that feeding DHA to tumor-bearing nu/nu mice improves the efficacy of DOX. Methods MDA-MB-231 cells were subjected to 4 conditions: a control mixture of 40 μM linoleic and 40 μM oleic acid (OALA), DHA (60 μM plus OALA), OALA DOX (0.41 μM), or DHA DOX (plus OALA) and assessed for effects on viability and function. Female nu/nu mice (6 wk old) bearing MDA-MB-231 tumors were randomly assigned to a nutritionally complete diet (20 g ± 2.8 g DHA/100 g diet) containing a polyunsaturated:saturated fat ratio of 0.5, with or without injections 2 times/wk of 5 mg DOX/kg for 4 wk. Results Microarray and protein analysis indicated that DHA DOX cells, compared with OALA DOX, had upregulated expression of apoptosis genes, Caspase-10 (1.3-fold), Caspase-9 (1.4-fold), and Receptor (TNFRSF)-interacting serine-threonine kinase 1 (RIPK1) (1.2-fold), while downregulating cell cycle genes, Cyclin B1 (-2.1-fold), WEE1 (-1.6-fold), and cell division cycle 25 homolog C (CDC25C) (-1.8-fold) (P < 0.05). DHA DOX-treated mice had 50% smaller tumors than control mice (P < 0.05). Analysis of proapoptotic proteins from tumors of DHA DOX mice showed increased Caspase-10 (by 68%) and BH3 interacting domain death agonist (Bid) (by 50%), decreased B-cell CLL/lymphoma 2 (BCL2) (by 24%), and decreased cell cycle proteins Cyclin B1 and Cdc25c (both by 42%), compared with control mice (P < 0.05). Conclusions Supplementation with DHA facilitates the action of DOX in MDA-MB-231 cells and in nu/nu mice, which may occur via amplification of the effect of DOX on apoptosis and cell cycle genes.
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Affiliation(s)
- Marnie Newell
- Department of Agricultural, Food & Nutritional Science, Faculty of Agricultural, Life & Environmental Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Miranda Brun
- Department of Agricultural, Food & Nutritional Science, Faculty of Agricultural, Life & Environmental Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Catherine J Field
- Department of Agricultural, Food & Nutritional Science, Faculty of Agricultural, Life & Environmental Sciences, University of Alberta, Edmonton, Alberta, Canada
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Brun M, Jain S, Monckton EA, Godbout R. Nuclear Factor I Represses the Notch Effector HEY1 in Glioblastoma. Neoplasia 2018; 20:1023-1037. [PMID: 30195713 PMCID: PMC6138789 DOI: 10.1016/j.neo.2018.08.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 08/17/2018] [Accepted: 08/20/2018] [Indexed: 01/16/2023] Open
Abstract
Glioblastomas (GBMs) are highly aggressive brain tumors with a dismal prognosis. Nuclear factor I (NFI) is a family of transcription factors that controls glial cell differentiation in the developing central nervous system. NFIs have previously been shown to regulate the expression of astrocyte markers such as glial fibrillary acidic protein (GFAP) in both normal brain and GBM cells. We used chromatin immunoprecipitation (ChIP)–on-chip to identify additional NFI targets in GBM cells. Analysis of our ChIP data revealed ~400 putative NFI target genes including an effector of the Notch signaling pathway, HEY1, implicated in the maintenance of neural stem cells. All four NFIs (NFIA, NFIB, NFIC, and NFIX) bind to NFI recognition sites located within 1 kb upstream of the HEY1 transcription site. We further showed that NFI negatively regulates HEY1 expression, with knockdown of all four NFIs in GBM cells resulting in increased HEY1 RNA levels. HEY1 knockdown in GBM cells decreased cell proliferation, increased cell migration, and decreased neurosphere formation. Finally, we found a general correlation between elevated levels of HEY1 and expression of the brain neural stem/progenitor cell marker B-FABP in GBM cell lines. Knockdown of HEY1 resulted in an increase in the RNA levels of the GFAP astrocyte differentiation marker. Overall, our data indicate that HEY1 is negatively regulated by NFI family members and is associated with increased proliferation, decreased migration, and increased stem cell properties in GBM cells.
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Affiliation(s)
- Miranda Brun
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada, T6G 1Z2
| | - Saket Jain
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada, T6G 1Z2
| | - Elizabeth A Monckton
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada, T6G 1Z2
| | - Roseline Godbout
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada, T6G 1Z2.
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Tellier E, Widemann A, Brun M, Sanderson F, Poullin P, Coppo P, Dignat-George F, Kaplanski G. Facteurs impliqués dans l’activation endothéliale au cours du purpura thrombotique thrombocytopénique. Rev Med Interne 2017. [DOI: 10.1016/j.revmed.2017.10.320] [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: 10/18/2022]
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15
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Tempelaere C, Brun M, Doursounian L, Feron JM. Traumatic avulsion of the flexor digitorum profundus tendon. Jersey finger, a 29 cases report. Hand Surg Rehabil 2017; 36:368-372. [PMID: 28694076 DOI: 10.1016/j.hansur.2017.06.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 12/21/2016] [Accepted: 06/19/2017] [Indexed: 11/30/2022]
Abstract
Traumatic avulsion of flexor digitorum profundus (jersey finger) is an uncommon injury. Our study aimed to describe functional outcomes of jersey fingers after surgical treatment. From January 2004 to 2014, we performed surgery on 32 patients who had jersey finger. Twenty-six of these patients were male and 6 were female with a mean age of 37.2years (range 16-68). Of the 32 cases, 11 were sports injuries, 16 presented on the ring finger and 13 on the little finger. Using the Leddy and Packer and Smith classifications, 16 of the injuries were type I, 4 were type II, 5 were type III, 7 were type IV. The mean time between injury and surgery was 6.8days (range: 0-32). The surgical techniques used were anchor, pull-out, or an association of both these techniques. Prior to the patient discharge, functional outcomes were evaluated. Twenty-nine patients were evaluated in total and three patients were lost. Of the 29, the average time between surgery and discharge was 36.6months ranging from 4.5 to 118months. According to the Buck-Gramcko classification, six patients had an excellent result, six had a good result, seven had a satisfactory result and ten a poor result. The mean Quick DASH score immediately to prior discharge was 5.66 (range: 0-56.82). Twelve complications were reported on nine patients. No infections were reported. Rapid diagnosis and rapid surgical treatment led to restoration of full range motion.
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Affiliation(s)
- C Tempelaere
- Service de chirurgie orthopédique, CHU Saint Antoine, 184, rue du Faubourg-Saint-Antoine, 75012 Paris, France.
| | - M Brun
- Service de chirurgie orthopédique, CHU Saint Antoine, 184, rue du Faubourg-Saint-Antoine, 75012 Paris, France; Clinique du Mont-Louis, 8-10, rue de la Folie-Regnault, 75011 Paris, France
| | - L Doursounian
- Service de chirurgie orthopédique, CHU Saint Antoine, 184, rue du Faubourg-Saint-Antoine, 75012 Paris, France
| | - J-M Feron
- Service de chirurgie orthopédique, CHU Saint Antoine, 184, rue du Faubourg-Saint-Antoine, 75012 Paris, France
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Jarrot P, Pelletier M, Mazodier K, Brun M, Jean R, Casanova D, Kaplanski G, Weiller P. Pseudo-pyoderma gangrenosum après réduction mammaire révélant une GPA. Rev Med Interne 2017. [DOI: 10.1016/j.revmed.2017.03.220] [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]
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Desbrières J, Rinaudo M, Brun M, Quinson J. Relation entre le taux de rétention et la distribution de pores dans une membrane d'ultrafiltration. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1981780187] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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19
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Quinson J, Brun M. Transformations de phase liquide [math] solide des solutions salines retenues au sein d'un milieu poreux: cas ou le matériau est saturé en eutectique. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1984810611] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Brun M, Lallemand A, Lorette G, Quinson JF, Richard M, Eyraud L, Eyraud C. Changement d’état liquide [math] solide dans les milieux poreux. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1973700973] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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22
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Ettabib MA, Lacava C, Liu Z, Bogris A, Kapsalis A, Brun M, Labeye P, Nicoletti S, Syvridis D, Richardson DJ, Petropoulos P. Wavelength conversion of complex modulation formats in a compact SiGe waveguide. Opt Express 2017; 25:3252-3258. [PMID: 28241541 DOI: 10.1364/oe.25.003252] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report a nonlinear signal processing system based on a SiGe waveguide suitable for high spectral efficiency data signals. Four-wave-mixing (FWM)-based wavelength conversion of 10-Gbaud 16-Quadrature amplitude modulated (QAM) and 64-QAM signals is demonstrated with less than -10-dB conversion efficiency (CE), 36-dB idler optical signal-to-noise ratio (OSNR), negligible bit error ratio (BER) penalty and a 3-dB conversion bandwidth exceeding 30nm. The SiGe device was CW-pumped and operated in a passive scheme without giving rise to any two-photon absorption (TPA) effects.
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24
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Carletti L, Sinobad M, Ma P, Yu Y, Allioux D, Orobtchouk R, Brun M, Ortiz S, Labeye P, Hartmann JM, Nicoletti S, Madden S, Luther-Davies B, Moss DJ, Monat C, Grillet C. Mid-infrared nonlinear optical response of Si-Ge waveguides with ultra-short optical pulses. Opt Express 2015; 23:32202-32214. [PMID: 26699010 DOI: 10.1364/oe.23.032202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We characterize the nonlinear optical response of low loss Si(0.6)Ge(0.4) / Si waveguides in the mid-infrared between 3.3 μm and 4 μm using femtosecond optical pulses. We estimate the three and four-photon absorption coefficients as well as the Kerr nonlinear refractive index from the experimental measurements. The effect of multiphoton absorption on the optical nonlinear Kerr response is evaluated and the nonlinear figure of merit estimated providing some guidelines for designing nonlinear optical devices in the mid-IR. Finally, we compare the impact of free-carrier absorption at mid-infrared wavelengths versus near-infrared wavelengths for these ultra-short pulses.
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25
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Amelot F, Picot E, Meusy A, Rousseau C, Brun M, Guillot B. [Syphilis in Montpellier, France, from 2002 to 2011: Survey in a free hospital screening centre for venereal disease and in the dermatology unit of a regional public hospital]. Ann Dermatol Venereol 2015; 142:742-50. [PMID: 26362133 DOI: 10.1016/j.annder.2015.07.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 09/19/2014] [Revised: 04/15/2015] [Accepted: 07/09/2015] [Indexed: 11/26/2022]
Abstract
BACKGROUND In a context of resurgent syphilis in France since 2000, we conducted a retrospective study in two different centres in Montpellier, France: the dermatology department of a public hospital and an anonymous and free centre for provision of information, diagnosis and treatment of venereal diseases (CDAG-CIDDIST). PATIENTS AND METHODS All patients with syphilis seen from January 2002 to December 2011 were included with the collaboration of the National Health Institute (InVS) and the Bacteriology Department of the public hospital. Epidemiology, clinical presentation, serological data, and treatment and monitoring data for up to 2 years were recorded. RESULTS One hundred and seventy-five cases of syphilis were diagnosed: 154 at the CDAG and 21 at the dermatology unit. Ninety-six percent of cases concerned men with a median age of 36 years. Eighty-two percent of these cases involved men having sex with men (MSM). Forty-nine percent of cases were diagnosed in the secondary stage, 22% in the primary stage and 28% in the latent stage. The treatment administered in the majority of cases (73%) was benzathine-penicillin G. The numbers of patients showing incomplete follow-up were equal at both centres, with 31 patients (17.7%) failing to attend the follow-up visit. A decrease of at least 2 dilutions in VDRL score occurred in the year following treatment for 93 of 103 patients (90%). Patients managed at the dermatology department were older than their counterparts managed at the CDAG and exhibited more frequent cutaneous eruptions (58% vs. 3%, P<0.0001) but were less frequently bisexual. However, no significant differences were seen concerning sex and associated infections (hepatitis, gonococcal infection, HPV or herpes). DISCUSSION Syphilis is on the rise, especially in the MSM population. The epidemiological characteristics of our cohort were consistent with those of other Western European countries. Although the reasons for consultation differed between CDAG/CIDDIST and the dermatology department, the two centres are complementary. Benzathine-penicillin G was the most commonly used treatment, in accordance with the recommendations. Measures must be introduced to improve patient monitoring without compromising anonymity.
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Affiliation(s)
- F Amelot
- Département de dermatologie, CHU, hôpital Saint-Éloi, 80, avenue Augustin-Fliche, 34000 Montpellier, France.
| | - E Picot
- CDAG/CIDDIST de Montpellier, département de dermatologie, hôpital Saint-Éloi, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
| | - A Meusy
- Département de l'information médicale, hôpital La-Colombière, 39, avenue Charles-Flahault, 34295 Montpellier cedex 5, France
| | - C Rousseau
- Cellule de l'InVS en région languedoc-roussillon (CIRE), département coordination des alertes et des régions, institut de veille sanitaire, ARS LR - 28 Parc-Club du Millénaire, 1025, rue Henri-Becquerel, CS3000, 34067 Montpellier cedex 2, France
| | - M Brun
- Laboratoire de bactériologie, hôpital Arnaud-de-Villeneuve, 371, avenue du Doyen-Gaston-Giraud, 34295 Montpellier cedex 5, France
| | - B Guillot
- Département de dermatologie, CHU, hôpital Saint-Éloi, 80, avenue Augustin-Fliche, 34000 Montpellier, France
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McPhedran RC, Movchan AB, Movchan NV, Brun M, Smith MJA. 'Parabolic' trapped modes and steered Dirac cones in platonic crystals. Proc Math Phys Eng Sci 2015; 471:20140746. [PMID: 27547089 DOI: 10.1098/rspa.2014.0746] [Citation(s) in RCA: 25] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
This paper discusses the properties of flexural waves governed by the biharmonic operator, and propagating in a thin plate pinned at doubly periodic sets of points. The emphases are on the design of dispersion surfaces having the Dirac cone topology, and on the related topic of trapped modes in plates for a finite set (cluster) of pinned points. The Dirac cone topologies we exhibit have at least two cones touching at a point in the reciprocal lattice, augmented by another band passing through the point. We show that these Dirac cones can be steered along symmetry lines in the Brillouin zone by varying the aspect ratio of rectangular lattices of pins, and that, as the cones are moved, the involved band surfaces tilt. We link Dirac points with a parabolic profile in their neighbourhood, and the characteristic of this parabolic profile decides the direction of propagation of the trapped mode in finite clusters.
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Affiliation(s)
- R C McPhedran
- Department of Mathematical Sciences , University of Liverpool , Liverpool L69 3BX, UK
| | - A B Movchan
- Department of Mathematical Sciences , University of Liverpool , Liverpool L69 3BX, UK
| | - N V Movchan
- Department of Mathematical Sciences , University of Liverpool , Liverpool L69 3BX, UK
| | - M Brun
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK; Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Universitá di Cagliari, Piazza d'Armi, Cagliari 09123, Italy
| | - M J A Smith
- Institut Fresnel (UMR 7249), Aix-Marseille Université , Marseille 13013, France
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Hildebrandt MR, Germain DR, Monckton EA, Brun M, Godbout R. Ddx1 knockout results in transgenerational wild-type lethality in mice. Sci Rep 2015; 5:9829. [PMID: 25909345 PMCID: PMC4408975 DOI: 10.1038/srep09829] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 03/20/2015] [Indexed: 12/21/2022] Open
Abstract
DEAD box 1 (DDX1) is a member of the DEAD box family of RNA helicases which are
involved in all aspects of RNA metabolism. DDX1 has been implicated in a variety of
biological processes, including 3’-end processing of mRNA, DNA repair,
microRNA processing, tRNA maturation and mRNA transport. To study the role of DDX1
during development, we have generated mice carrying a constitutive Ddx1
knock-out allele. Ddx1+/− mice have no obvious
phenotype and express similar levels of DDX1 as wild-type mice indicating
compensation from the intact Ddx1 allele. Heterozygote matings produce no
viable Ddx1−/− progeny, with
Ddx1−/− embryos dying prior to
embryonic day (E) 3.5. Intriguingly, the number of wild-type progeny is
significantly decreased in heterozygote crosses, with two different heterozygote
populations identified based on parental genotype: (i) normal
Ddx1+/− mice which generate the expected number
of wild-type progeny and (ii) Ddx1*/− mice (with *
signifying a non-genetically altered allele) which generate a significantly reduced
number of wild-type mice. The transgenerational inheritance of wild-type lethality
observed upon crossing Ddx1*/− mice is independent
of parental sex and occurs in cis through a mechanism that is different from
other types of previously reported transgenerational epigenetic inheritance.
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Affiliation(s)
- Matthew R Hildebrandt
- Department of Oncology, University of Alberta, Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta T6G 1Z2, Canada
| | - Devon R Germain
- Department of Oncology, University of Alberta, Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta T6G 1Z2, Canada
| | - Elizabeth A Monckton
- Department of Oncology, University of Alberta, Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta T6G 1Z2, Canada
| | - Miranda Brun
- Department of Oncology, University of Alberta, Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta T6G 1Z2, Canada
| | - Roseline Godbout
- Department of Oncology, University of Alberta, Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta T6G 1Z2, Canada
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Carletti L, Ma P, Yu Y, Luther-Davies B, Hudson D, Monat C, Orobtchouk R, Madden S, Moss DJ, Brun M, Ortiz S, Labeye P, Nicoletti S, Grillet C. Nonlinear optical response of low loss silicon germanium waveguides in the mid-infrared. Opt Express 2015; 23:8261-8271. [PMID: 25968664 DOI: 10.1364/oe.23.008261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have investigated the nonlinear optical response of low loss Si(0.6)Ge(0.4) / Si waveguides in the mid-infrared wavelength range from 3.25- 4.75μm using picosecond optical pulses. We observed and measured the three and four-photon absorption coefficients as well as the Kerr nonlinear refractive index. The dynamics of the spectral broadening suggests that, in addition to multiphoton absorption, the corresponding higher order nonlinear refractive phenomena also needs to be included when high optical pulse intensities are used at mid-infrared wavelengths in this material.
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Costabel U, Richeldi L, du Bois RM, Raghu G, Azuma A, Brown KK, Cottin V, Flaherty KR, Inoue Y, Kim DS, Kolb M, Noble PW, Selman M, Taniguchi H, Brun M, Girard M, Schlenker-Herceg R, Disse B, Collard HR. Efficacy and safety of nintedanib in patients with idiopathic pulmonary fibrosis: Results of two 52-week, Phase III, randomized, placebo-controlled trials (INPULSIS™). Pneumologie 2015. [DOI: 10.1055/s-0035-1544829] [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: 10/24/2022]
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Amelot F, Picot E, Meusy A, Rousseau C, Brun M, Guillot B. La syphilis à Montpellier au CDAG-CIDDIST et dans le service de dermatologie du CHRU de 2002 à 2011. Ann Dermatol Venereol 2014. [DOI: 10.1016/j.annder.2014.09.477] [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: 10/24/2022]
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Kempf M, Varon E, Lepoutre A, Gravet A, Baraduc R, Brun M, Chardon H, Cremniter J, Croizé J, Dalmay F, Demachy MC, Fosse T, Grelaud C, Hadou T, Hamdad F, Koeck JL, Luce S, Mermond S, Patry I, Péchinot A, Raymond J, Ros A, Segonds C, Soullié B, Tandé D, Vergnaud M, Vernet-Garnier V, Wallet F, Gutmann L, Ploy MC, Lanotte P. Decline in antibiotic resistance and changes in the serotype distribution of Streptococcus pneumoniae isolates from children with acute otitis media; a 2001-2011 survey by the French Pneumococcal Network. Clin Microbiol Infect 2014; 21:35-42. [PMID: 25636925 DOI: 10.1016/j.cmi.2014.08.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [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: 06/09/2014] [Revised: 07/25/2014] [Accepted: 08/06/2014] [Indexed: 11/19/2022]
Abstract
Streptococcus pneumoniae is an important cause of acute otitis media (AOM). The aim of this study was to evaluate trends in antibiotic resistance and circulating serotypes of pneumococci isolated from middle ear fluid of French children with AOM during the period 2001-2011, before and after the introduction of the PCV-7 (2003) and PCV-13 (2010) vaccines. Between 2001 and 2011 the French pneumococcal surveillance network analysed the antibiotic susceptibility of 6683 S. pneumoniae isolated from children with AOM, of which 1569 were serotyped. We observed a significant overall increase in antibiotic susceptibility. Respective resistance (I+R) rates in 2001 and 2011 were 76.9% and 57.3% for penicillin, 43.0% and 29.8% for amoxicillin, and 28.6% and 13.0% for cefotaxime. We also found a marked reduction in vaccine serotypes after PCV-7 implementation, from 63.0% in 2001 to 13.2% in 2011, while the incidence of the additional six serotypes included in PCV-13 increased during the same period, with a particularly high proportion of 19A isolates. The proportion of some non-PCV-13 serotypes also increased between 2001 and 2011, especially 15A and 23A. Before PCV-7 implementation, most (70.8%) penicillin non-susceptible pneumococci belonged to PCV-7 serotypes, whereas in 2011, 56.8% of penicillin non-susceptible pneumococci belonged to serotype 19A. Between 2001 and 2011, antibiotic resistance among pneumococci responsible for AOM in France fell markedly, and PCV-7 serotypes were replaced by non-PCV-7 serotypes, especially 19A. We are continuing to assess the impact of PCV-13, introduced in France in 2010, on pneumococcal serotype circulation and antibiotic resistance.
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Affiliation(s)
- M Kempf
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - E Varon
- Centre National de Référence des Pneumocoques (CNRP), AP-HP HEGP, Paris, France
| | - A Lepoutre
- Institut de Veille Sanitaire (InVS), Saint Maurice, France
| | - A Gravet
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - R Baraduc
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - M Brun
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - H Chardon
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - J Cremniter
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - J Croizé
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - F Dalmay
- CHU Limoges, UFRCB, Limoges, France
| | - M-C Demachy
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - T Fosse
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - C Grelaud
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - T Hadou
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - F Hamdad
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - J-L Koeck
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - S Luce
- CHU Limoges, UFRCB, Limoges, France
| | - S Mermond
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - I Patry
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - A Péchinot
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - J Raymond
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - A Ros
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - C Segonds
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - B Soullié
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - D Tandé
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - M Vergnaud
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - V Vernet-Garnier
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - F Wallet
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - L Gutmann
- Centre National de Référence des Pneumocoques (CNRP), AP-HP HEGP, Paris, France
| | - M-C Ploy
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France
| | - P Lanotte
- French pneumococcal surveillance network 'Observatoires Régionaux du Pneumocoque', CHU Limoges, Limoges, France.
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Abstract
In this paper, we investigate the formation of band-gaps and localization phenomena in an elastic strip nearly disintegrated by an array of transverse cracks. We analyse the eigenfrequencies of finite, strongly damaged, elongated solids with reference to the propagation bands of an infinite strip with a periodic damage. Subsequently, we determine analytically the band-gaps of the infinite strip by using a lower-dimensional model, represented by a periodically damaged beam in which the small ligaments between cracks are modelled as ‘elastic junctions’. The effective rotational and translational stiffnesses of the elastic junctions are obtained from an
ad hoc
asymptotic analysis. We show that, for a finite frequency range, the dispersion curves for the reduced beam model agree with the dispersion data determined numerically for the two-dimensional elastic strip. Exponential localization, boundary layers and standing waves in strongly damaged systems are discussed in detail.
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Affiliation(s)
- G. Carta
- Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Università di Cagliari, Cagliari, Italy
- Department of Mathematical Sciences, University of Liverpool, Liverpool, L69 3BX, UK
| | - M. Brun
- Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Università di Cagliari, Cagliari, Italy
- Department of Mathematical Sciences, University of Liverpool, Liverpool, L69 3BX, UK
| | - A. B. Movchan
- Department of Mathematical Sciences, University of Liverpool, Liverpool, L69 3BX, UK
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33
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Masson E, Lacroix R, Sautereau N, Eldin C, Ebbo M, Brun M, Arnaud L, Thuret I, Schleinitz N, Harle JR, Dignat George F, Bernit E. Un biomarqueur de la vasculopathie de l’adulte drépanocytaire ? Rev Med Interne 2014. [DOI: 10.1016/j.revmed.2014.03.037] [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: 11/30/2022]
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34
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Brown KK, Richeldi L, Costabel U, Flaherty KR, Kim DS, Noble PW, Raghu G, Selman M, Brun M, Klüglich M, Staines H, du Bois RM. Behandlung der Idiopathischen Lungenfibrose (IPF) mit dem Tyrosinkinaseinhibitor Nintedanib: Patientenberichtete Endpunkte in der TOMORROW-Studie. Pneumologie 2014. [DOI: 10.1055/s-0034-1368044] [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: 10/25/2022]
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35
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Colquitt DJ, Jones IS, Movchan NV, Movchan AB, Brun M, McPhedran RC. Making waves round a structured cloak: lattices, negative refraction and fringes. Proc Math Phys Eng Sci 2013; 469:20130218. [PMID: 24062625 PMCID: PMC3780812 DOI: 10.1098/rspa.2013.0218] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 06/05/2013] [Indexed: 11/25/2022] Open
Abstract
Using the framework of transformation optics, this paper presents a detailed analysis of a non-singular square cloak for acoustic, out-of-plane shear elastic and electromagnetic waves. Analysis of wave propagation through the cloak is presented and accompanied by numerical illustrations. The efficacy of the regularized cloak is demonstrated and an objective numerical measure of the quality of the cloaking effect is provided. It is demonstrated that the cloaking effect persists over a wide range of frequencies. As a demonstration of the effectiveness of the regularized cloak, a Young's double slit experiment is presented. The stability of the interference pattern is examined when a cloaked and uncloaked obstacle are successively placed in front of one of the apertures. This novel link with a well-known quantum mechanical experiment provides an additional method through which the quality of cloaks may be examined. In the second half of the paper, it is shown that an approximate cloak may be constructed using a discrete lattice structure. The efficiency of the approximate lattice cloak is analysed and a series of illustrative simulations presented. It is demonstrated that effective cloaking may be obtained by using a relatively simple lattice structure, particularly, in the low-frequency regime.
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Affiliation(s)
- D. J. Colquitt
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
| | - I. S. Jones
- School of Engineering, John Moores University, Liverpool L3 3AF, UK
| | - N. V. Movchan
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
| | - A. B. Movchan
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
| | - M. Brun
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
- Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Universitá di Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
| | - R. C. McPhedran
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
- CUDOS, School of Physics, University of Sydney, New South Wales 2006, Australia
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36
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Brun M, Glubrecht DD, Baksh S, Godbout R. Calcineurin regulates nuclear factor I dephosphorylation and activity in malignant glioma cell lines. J Biol Chem 2013; 288:24104-15. [PMID: 23839947 DOI: 10.1074/jbc.m113.455832] [Citation(s) in RCA: 15] [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] [Indexed: 01/05/2023] Open
Abstract
Malignant gliomas (MG), including grades III and IV astrocytomas, are the most common adult brain tumors. These tumors are highly aggressive with a median survival of less than 2 years. Nuclear factor I (NFI) is a family of transcription factors that regulates the expression of glial genes in the developing brain. We have previously shown that regulation of the brain fatty acid-binding protein (B-FABP; FABP7) and glial fibrillary acidic protein (GFAP) genes in MG cells is dependent on the phosphorylation state of NFI, with hypophosphorylation of NFI correlating with GFAP and B-FABP expression. Importantly, NFI phosphorylation is dependent on phosphatase activity that is enriched in GFAP/B-FABP+ve cells. Using chromatin immunoprecipitation, we show that NFI occupies the GFAP and B-FABP promoters in NFI-hypophosphorylated GFAP/B-FABP+ve MG cells. NFI occupancy, NFI-dependent transcriptional activity, and NFI phosphorylation are all modulated by the serine/threonine phosphatase calcineurin. Importantly, a cleaved form of calcineurin, associated with increased phosphatase activity, is specifically expressed in NFI-hypophosphorylated GFAP/B-FABP+ve MG cells. Calcineurin in GFAP/B-FABP+ve MG cells localizes to the nucleus. In contrast, calcineurin is primarily found in the cytoplasm of GFAP/B-FABP-ve cells, suggesting a dual mechanism for calcineurin activation in MG. Finally, our results demonstrate that calcineurin expression is up-regulated in areas of high infiltration/migration in grade IV astrocytoma tumor tissue. Our data suggest a critical role for calcineurin in NFI transcriptional regulation and in the determination of MG infiltrative properties.
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Affiliation(s)
- Miranda Brun
- Departments of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada
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37
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Brun M, Camillieri E, Genot S, Thuny F, Harle JR, Mazodier K, Kaplanski G. Myocardite aiguë grave au cours d’une poussée de maladie de Still traitée avec succès par antagoniste du récepteur de l’interleukine-1. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.125] [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: 10/26/2022]
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38
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Brun M, Mazodier K, Farnault L, Harle JR, Chetaille B, Costello R, Kaplanski G. Premier cas de syndrome d’activation macrophagique secondaire à une hépatite virale E (VHE) chez un patient atteint d’un lymphome splénique. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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39
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Brun M, Widemann A, Bachelier R, Robert S, Poullin P, Dignat-George F, Kaplanski G. Rôle de la blessure calcique et des immunoglobulines G circulantes dans la mort cellulaire et la microvésiculation endothéliale au cours du purpura thrombotique thrombocytopénique auto-immun de l’adulte. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.230] [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: 11/27/2022]
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40
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Jean E, Brun M, Harti K, Loeve C, Albanese J, Sanderson F, Harle JR, Poullin P, Kaplanski G. Exceptionnelle présentation hépatique d’un purpura thrombocytopénique thrombotique auto-immun, à propos d’un cas. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.136] [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: 10/26/2022]
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41
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Brun M, Freslon M, Champdavoine AL, Gayet LÉ. Évaluation fonctionnelle après lambeau homodactyle en îlot antérograde pour perte de substance pulpaire des doigts longs. À propos de 15 cas. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.main.2012.10.161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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42
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Abstract
The paper presents an approach to modelling a novel elastic metamaterial structure that possesses non-trivial dispersion features. A system of spinners has been embedded into a two-dimensional periodic lattice system. The analysis of the motion of the spinners is used to derive an expression for a ‘chiral term’ in the equations describing the dynamics of the lattice. Dispersion of elastic waves is shown to possess innovative filtering and polarization properties induced by the vortex-type nature of the structured media. The related effective behaviour in a continuous medium is implemented to build a shielding cloak around an obstacle. Analytical work is accompanied by numerical illustrations.
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Affiliation(s)
- M. Brun
- Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Universitá di Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
- Istituto Officina dei Materiali del CNR (CNR-IOM) Unitá SLACS, Cittadella Universitaria, 09042 Monserrato (Ca), Italy
| | - I. S. Jones
- School of Engineering, John Moores University, Liverpool L3 3AF, UK
| | - A. B. Movchan
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
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43
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Brun M, Frénéa-Robin M, Chateaux JF, Haddour N, Deman AL, Ferrigno R. A new microfluidic device for electric lysis and separation of cells. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2012:6281-6284. [PMID: 23367365 DOI: 10.1109/embc.2012.6347430] [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: 06/01/2023]
Abstract
This paper demonstrates the potential use of a new microfluidic device embedding thick electrodes for cell lysis and cell separation applications. The system consists of a microfluidic channel featuring conductive walls made of a polydimethylsiloxane (PDMS) matrix mixed with carbon nanoparticles. Cell lysis was performed electrically by applying square pulses across the channel width, which was monitored by fluorimetry. Lysed and unlysed cells showed different dielectrophoretic behavior under appropriate experimental conditions, which suggests that the developed device is suitable to perform both cell lysis and subsequent sorting of viable and dead cells.
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Affiliation(s)
- M Brun
- Ampère Lab, UMR5005 CNRS, Ecole Centrale de Lyon, 39134 Ecully Cedex, France.
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44
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Benalcázar M, Padín J, Brun M, Pastore J, Ballarin V, Peirone L, Pereyra G. Measuring Leaf Area in Soy Plants by HSI Color Model Filtering and Mathematical Morphology. ACTA ACUST UNITED AC 2011. [DOI: 10.1088/1742-6596/332/1/012034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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45
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Brun M, Desilles S, Dellyes A, Lafforgue P, Berda-Haddad Y, Mazodier K, Harle JR, Kaplanski G. La pneumocystose pulmonaire : une cause rare de syndrome d’activation macrophagique au cours des maladies auto-immunes. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.071] [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: 11/29/2022]
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46
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Brun M, Moucadel M, Cristea A, Mazodier K, Genot S, Costello R, Harle JR, Kaplanski G. Sarcoïdose pulmonaire pseudo-tumorale : à propos de deux cas. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.035] [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: 10/15/2022]
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47
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Brun M, Chandesris MO, Mazodier K, Chiche L, Ebbo M, Legall S, Veit V, Bernit E, Durand JM, Harle JR, Nicolino-Brunet C, Kaplanski G. Déficit spécifique de l’expression érythrocytaire de la molécule régulatrice du complément CD59 au cours des anémies hémolytiques par agglutinines froides. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.379] [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: 10/15/2022]
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48
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Abstract
The paper addresses a mathematical model describing the dynamic response of an elongated bridge supported by elastic pillars. The elastic system is considered as a multi-structure involving subdomains of different limit dimensions connected via junction regions. Analytical formulae have been derived to estimate eigenfrequencies in the low frequency range. The analytical findings for Bloch–Floquet waves in an infinite periodic structure are compared with the finite element numerical computations for an actual bridge structure of finite length. The asymptotic estimates obtained here have also been used as a design tool in problems of asymptotic optimization.
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Affiliation(s)
- M. Brun
- Department of Structural Engineering, University of Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
- Istituto Officina dei Materiali del CNR (CNR-IOM) Unità SLACS, Cittadella Universitaria, 09042 Monserrato (Ca), Italy
| | - G. F. Giaccu
- Department of Structural Engineering, University of Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
| | - A. B. Movchan
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
| | - N. V. Movchan
- Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, UK
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49
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Le Perchec J, de Lamaestre RE, Brun M, Rochat N, Gravrand O, Badano G, Hazart J, Nicoletti S. High rejection bandpass optical filters based on sub-wavelength metal patch arrays. Opt Express 2011; 19:15720-15731. [PMID: 21934934 DOI: 10.1364/oe.19.015720] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report the study of a resonant bandpass filter made of a very thin subwavelength metal patch array coupled to a high index dielectric waveguide. The spectral properties of those filters can easily be tuned by playing on the lateral dimensions of the grating. They exhibit high and narrow transmission peaks together with very good rejection of light out of the pass-band and low angular dependance. An experimental demonstration using standard large scale silicon microelectronics processes is presented in the mid infrared spectral range. This concept of filters can easily be scaled throughout the optical spectrum, and can be integrated within focal plane arrays of various imaging technologies, down to visible wavelengths.
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Affiliation(s)
- J Le Perchec
- CEA, LETI, Minatec Campus, 17 rue des martyrs, 38042 Grenoble, France.
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50
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Grévin B, Fakir M, Hayton J, Brun M, Demadrille R, Faure-Vincent J. Qplus AFM driven nanostencil. Rev Sci Instrum 2011; 82:063706. [PMID: 21721701 DOI: 10.1063/1.3600898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe the development of a novel setup, in which large stencils with suspended silicon nitride membranes are combined with atomic force microscopy (AFM) regulation by using tuning forks. This system offers the possibility to perform separate AFM and nanostencil operations, as well as combined modes when using stencil chips with integrated tips. The flexibility and performances are demonstrated through a series of examples, including wide AFM scans in closed loop mode, probe positioning repeatability of a few tens of nanometer, simultaneous evaporation of large (several hundred of micron square) and nanoscopic metals and fullerene patterns in static, multistep, and dynamic modes. This approach paves the way for further developments, as it fully combines the advantages of conventional stenciling with the ones of an AFM driven shadow mask.
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Affiliation(s)
- B Grévin
- CEA-INAC-UMR 5819-SPrAM (CEA-CNRS-UJF), 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France.
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