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Deschamps C, Apper E, Brun M, Durif C, Denis S, Humbert D, Blanquet-Diot S. Development of a new antibiotic-induced dysbiosis model of the canine colonic microbiota. Int J Antimicrob Agents 2024; 63:107102. [PMID: 38325721 DOI: 10.1016/j.ijantimicag.2024.107102] [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: 12/01/2023] [Revised: 01/05/2024] [Accepted: 01/29/2024] [Indexed: 02/09/2024]
Abstract
As in humans, antibiotics are widely used in dogs to treat gastrointestinal infections, contributing to the global burden of antimicrobial resistance on both human and animal health. Close contact between pets and their owners can lead to horizontal transfer of gut microbes, including transmission of antibiotic resistance. Nevertheless, until now, the impact of antibiotics on the canine gut microbiota has been poorly described. The aim of this study was to adapt the canine mucosal artificial colon (CANIM-ARCOL) model, reproducing the main nutritional, physicochemical and microbial parameters found in the large intestine of the dog to simulate an antibiotic-induced perturbation. Following initial investigation of five antibiotic cocktails at in-field doses, a 5-day regimen of metronidazole/enrofloxacin (ME) was selected for further model development. Two CANIM-ARCOL bioreactors were inoculated with a faecal sample (n=2 donors) and run in parallel for 26 days under control or antibiotic conditions. ME reduced microbial diversity and induced major shifts in bacterial populations, leading to a state of dysbiosis characterized by an increase in the relative abundance of Streptococcaceae, Lactobacillaceae and Enterobacteriaceae, and a decrease in the relative abundance of Bacteroidaceae, Fusobacteriota and Clostridiaceae. Overall, mucus-associated microbiota were less impacted by antibiotics than luminal microbes. Microbial alterations were associated with drastic decreases in gas production and short-chain fatty acid concentrations. Finally, the model was well validated through in-vitro-in-vivo comparisons in a study in dogs. The CANIM-ARCOL model provides a relevant platform as an alternative to in-vivo assays for an in-depth understanding of antibiotic-microbiota interactions and further testing of restoration strategies at individual level.
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Affiliation(s)
- Charlotte Deschamps
- Université Clermont Auvergne, UMR 454 MEDIS UCA-INRAE, Clermont-Ferrand, France; Lallemand Animal Nutrition, Blagnac Cedex, France
| | | | - Morgane Brun
- Université Clermont Auvergne, UMR 454 MEDIS UCA-INRAE, Clermont-Ferrand, France
| | - Claude Durif
- Université Clermont Auvergne, UMR 454 MEDIS UCA-INRAE, Clermont-Ferrand, France
| | - Sylvain Denis
- Université Clermont Auvergne, UMR 454 MEDIS UCA-INRAE, Clermont-Ferrand, France
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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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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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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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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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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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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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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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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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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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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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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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23
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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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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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26
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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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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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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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29
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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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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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31
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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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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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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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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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35
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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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36
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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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37
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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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38
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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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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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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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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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Capel F, Delmotte M, Brun M, Lonchampt M, De Fanti B, Xuereb L, Baschet L, Rolland G, Galizzi J, Lockhart B, Ktorza A, Dacquet C. Aging and Obesity Induce Distinct Gene Expression Adaptation in the Liver of C57BL/6J Mice. J Nutrigenet Nutrigenomics 2011; 4:154-64. [DOI: 10.1159/000328190] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Accepted: 04/04/2011] [Indexed: 12/22/2022]
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Hayton J, Polesel-Maris J, Demadrille R, Brun M, Thoyer F, Lubin C, Cousty J, Grévin B. Atomic force microscopy imaging using a tip-on-chip: opening the door to integrated near field nanotools. Rev Sci Instrum 2010; 81:093707. [PMID: 20886987 DOI: 10.1063/1.3477996] [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: 05/29/2023]
Abstract
We describe in detail how atomic force microscopy (AFM) images can be routinely achieved with macroscopic silicon-based chips integrating mesoscopic tips, paving the way for the development of new near field devices combining AFM imaging with any kind of functionality integrated on a chip. The chips have been glued at the end of the free prong of 100 kHz quartz tuning forks mounted in Qplus configuration. Numerical simulations by modal analysis have been carried out to clarify the nature of the vibration modes observed in the experimental spectra. It is shown that two low frequency modes can be used to drive the system and scan the surface with a great stability in amplitude modulation as well as in frequency modulation AFM under ultrahigh vacuum. The AFM capabilities are demonstrated through a series of examples including phase and dissipation contrast imaging, force spectroscopy measurements, and investigations of soft samples in weak interaction with the substrate. The lateral resolution with the tips grown by focused ion beam deposition already matches the one achieved in standard amplitude modulation mode AFM experiments.
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Affiliation(s)
- J Hayton
- UMR 5819 SPrAM (CEA-CNRS-UJF), CEA-Grenoble, INAC, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France
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Walker M, Delord S, Brun M, Dilharreguy B, Mayo W, Allard M. Neural Networks involved in Automatic and Controlled Processes in Visual Selective Attention: an fMRI study. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70355-6] [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] Open
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Perez T, Arnould B, Grosbois JM, Bosch V, Guillemin I, Bravo ML, Brun M, Tonnel AB. Validity, reliability, and responsiveness of a new short Visual Simplified Respiratory Questionnaire (VSRQ) for health-related quality of life assessment in chronic obstructive pulmonary disease. Int J Chron Obstruct Pulmon Dis 2009; 4:9-18. [PMID: 19436682 PMCID: PMC2672786] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
The Visual Simplified Respiratory Questionnaire (VSRQ) was designed to assess health-related quality of life (HRQoL) in patients with chronic obstructive pulmonary disease (COPD). It contains eight items: dyspnea, anxiety, depressed mood, sleep, energy, daily activities, social activities and sexual life. Psychometric properties were assessed during a clinical trial that evaluated the impact of tiotropium on HRQoL of COPD patients. These included the determination of structure, internal consistency reliability, concurrent validity with the St George's Respiratory Questionnaire (SGRQ), test - retest reliability, clinical validity and responsiveness to change over two weeks. Minimal important difference (MID) was calculated; cumulative response curves (CRC) were based on the dyspnea item. Psychometric analyses showed that VSRQ structure was unidimensional. The questionnaire demonstrated good internal consistency reliability (Cronbach's alpha = 0.84), good concurrent validity with SGRQ (Spearman = -0.70) and clinical validity, good test-retest reproducibility (ICC = 0.77), and satisfactory responsiveness (standardized response mean = 0.57; Guyatt's statistic = 0.63). MID was 3.4; CRC median value of the 'minimally improved' patients was 3.5. In conclusion, VSRQ brevity and satisfactory psychometric properties make it a good candidate for large studies to assess HRQoL in COPD patients. Further validation is needed to extend its use in clinical practice.
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Affiliation(s)
- T Perez
- Centre Hospitalier Régional Universitaire (CHRU), Lille, France
| | | | - J-M Grosbois
- Service de Pneumologie, Centre Hospitalier de Béthune, Béthune, France
| | | | | | - M-L Bravo
- Boehringer Ingelheim France, Reims Cédex, France
| | - M Brun
- Boehringer Ingelheim France, Reims Cédex, France
| | - A-B Tonnel
- Centre Hospitalier Régional Universitaire (CHRU), Lille, France
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Merle De Boever C, Mura F, Brun M, Reynes J. Bartonellose oculaire chez une patiente co-infectée VIH–VHC. Med Mal Infect 2008; 38:504-6. [DOI: 10.1016/j.medmal.2008.06.006] [Citation(s) in RCA: 2] [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] [Received: 09/17/2007] [Revised: 12/21/2007] [Accepted: 06/10/2008] [Indexed: 10/21/2022]
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Tonnel AB, Perez T, Grosbois JM, Verkindre C, Bravo ML, Brun M. Effect of tiotropium on health-related quality of life as a primary efficacy endpoint in COPD. Int J Chron Obstruct Pulmon Dis 2008; 3:301-10. [PMID: 18686739 PMCID: PMC2629970 DOI: 10.2147/copd.s2463] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Clinical manifestations of chronic obstructive pulmonary disease (COPD), including airflow limitation, dyspnea, and activity limitation, ultimately lead to impaired health-related quality of life (HRQoL). This 9-month, randomized, double-blind, multicenter study compared the effect of once-daily tiotropium 18 microg and placebo on HRQoL, spirometric parameters, and exacerbations in 554 patients with moderate-to-severe COPD. HRQoL was assessed using the St. George's Respiratory Questionnaire (SGRQ) and the new 8-item Visual Simplified Respiratory Questionnaire (VSRQ), which is currently being validated. The primary efficacy endpoint was the proportion of patients achieving a reduction of at least 4 units in the SGRQ total score at study end (Month 9). Mean +/- SD baseline SGRQ total score was 47.4 +/- 18.1. Significantly more tiotropium-treated patients achieved a reduction of at least 4 units in the SGRQ score vs placebo at study end (59.1% vs 48.2%, respectively; p = 0.029). Tiotropium significantly improved spirometric parameters (forced expiratory volume in 1 second [FEV1]: 0.11 +/- 0.02 L vs 0.01 +/- 0.02 L; between-group difference: 0.10 +/- 0.03 L, p = 0.0001) and reduced exacerbations vs placebo. Maintenance treatment with tiotropium provided significant and clinically relevant improvements in HRQoL, as measured by the SGRQ.
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Affiliation(s)
- A-B Tonnel
- Centre Hospitalier Régional Universitaire (CHRU) de Lille, Service de Pneumologie et Immuno-Allergologie, Lille Cedex, France.
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Meyer-Witte S, Brissaud O, Brun M, Lamireau D, Bordessoules M, Chateil JF. [Prognostic value of MR in term neonates with neonatal hypoxic-ischemic encephalopath: MRI score and spectroscopy. About 26 cases]. Arch Pediatr 2007; 15:9-23. [PMID: 18164915 DOI: 10.1016/j.arcped.2007.08.027] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2006] [Revised: 07/20/2007] [Accepted: 08/28/2007] [Indexed: 10/22/2022]
Abstract
UNLABELLED Neonatal hypoxic-ischemic encephalopathy remains a major cause of chronic disability in childhood. Early diagnosis and prognosis are necessary for the clinician to adapt the treatment. However, there is yet no reliable test to predict the patient's evolution. OBJECTIVE The aim of our study was to evaluate the predictive value of a personal magnetic resonance imaging (MRI) scoring system and of magnetic resonance spectroscopy (MRS). MATERIAL AND METHODS We included 26 term newborns in condition of neonatal brain suffering. MR examination was performed during the first week of life for all patients and MRI and MRS data were collected. Standardised follow-up visits were made for all patients. Finally, prognostic value of the different criteria was evaluated with statistical tests. RESULTS Our MRI scoring system proved to be linked to prognosis. A high MRI score, abnormal signal in the internal capsule, white matter or basal ganglia abnormalities with diffusion imaging were associated with unfavourable outcome. These results confirmed the data of the literature concerning the MRI predictive value. Our study also confirmed prognostic interest of MR: particularly, ratios using lactate were significantly linked to prognosis in our study. Specificity of the elevation of these ratios was interesting but sensibility was less optimal. CONCLUSION We suggest using our MRI scoring system which associates standard MRI and diffusion imaging, which is significantly related to outcome. We confirm the prognostic value of MRS in this pathological situation. MR with diffusion sequence and spectroscopy, performed three to four days after birth appears to be an essential tool to manage these patients.
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Affiliation(s)
- S Meyer-Witte
- Service de neuropédiatrie, hôpital Pellegrin, 33076 Bordeaux, France.
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Djidjik R, Ghaffor M, Brun M, Gharnaout M, Salah SS, Boukouaci W, Djidjik H, Benyounes A, Koumaravelou K, Krishnamoorthy R, Abbadi MC, Charron D, Tamouza R. Constitutive nitric oxide synthase gene polymorphisms and house dust mite respiratory allergy in an Algerian patient group. ACTA ACUST UNITED AC 2007; 71:160-4. [PMID: 18086269 DOI: 10.1111/j.1399-0039.2007.00976.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Genetic polymorphisms in neuronal nitric oxide synthase (NOS1) and calmodulin-dependent endothelial NOS (NOS3) genes are known to influence the course of allergic respiratory disorders. We investigated the role of NOS1 -84 G-->A and NOS3 -786 T-->C, 894 G-->T and 27 base pair (bp) repeat polymorphisms in 125 patients suffering from asthma and/or rhinitis and monosensitized against Dermatophagoides pteronyssinus (Dpter) and 111 controls from Algeria. We found a higher frequency of the -786 C NOS3 allele in patients than in controls [corrected P value (Pc) = 0.04], especially in female cases (Pc = 0.02) and that the 'ab' genotype of the 27-bp polymorphism was significantly associated with specific immunoglobulin E production against Dpter (P = 0.006). This study brings further support for the participation of NOS3 gene polymorphism in the pathogenesis of respiratory allergic disorders.
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Affiliation(s)
- R Djidjik
- Laboratoire de Biologie, Unité d'Immunologie, CHU Beni-Messous, Algiers, Algeria
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Takashina K, Brun M, Ota T, Maude DK, Fujiwara A, Ono Y, Takahashi Y, Hirayama Y. Anomalous resistance ridges along filling factor nu=4i. Phys Rev Lett 2007; 99:036803. [PMID: 17678309 DOI: 10.1103/physrevlett.99.036803] [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] [Received: 11/15/2006] [Indexed: 05/16/2023]
Abstract
We report anomalous structure in the magnetoresistance of SiO(2)/Si(100)/SiO(2) quantum wells. When Landau levels of opposite valleys are driven through coincidence at the Fermi level, the longitudinal resistance displays elevations at filling factors that are integer multiples of 4 (nu=4i) accompanied by suppression on either side of nu=4i. This persists when either the magnetic field or the valley splitting is swept, leading to resistance ridges running along nu=4i. The range of field over which they are observed points to the role of spin degeneracy, which is directly confirmed by their disappearance with the addition of an in-plane magnetic field. The data suggest a new type of many-body effect arising from the combined degeneracy due to the valley and the spin degrees of freedom.
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Affiliation(s)
- K Takashina
- NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan
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