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8 results on '"Le Brun, Matthieu"'

2. Less and more IGM-transmitted galaxies from z similar to 2.7 to z similar to 6 from VANDELS and VUDS

Author

Thomas, R., Pentericci, L., Le Fevre, O., Koekemoer, A. M., Castellano, M., Cimatti, A., Fontanot, F., Gargiulo, A., Garilli, B., Talia, M., Amorin, R., Bardelli, S., Cristiani, S., Cresci, G., Franco, M., Fynbo, J. P. U., Hathi, N. P., Hibon, P., Khusanova, Y., Le Brun, Matthieu, Lemaux, B. C., Mannucci, F., Schaerer, D., Zamorani, G., and Zucca, E.

Subjects
STELLAR, DATA-REDUCTION, intergalactic medium, miscellaneous [cosmology], REDSHIFTS, INTERGALACTIC MEDIUM TRANSMISSION, high-redshift [galaxies], EVOLUTION
Abstract

Aims. Our aim is to analyze the variance of the intergalactic medium (IGM) transmission by studying this parameter in the rest-frame UV spectra of a large sample of high-redshift galaxies.Methods. We made use of the VIMOS Ultra Deep Survey and the VANDELS public survey to gain insight into the far UV spectrum of 2.7

Published
2021
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3. Sunyaev-Zel'dovich detection of the galaxy cluster Cl J1449+0856 at z=1.99:The pressure profile in uv space

Author

Gobat, R., Daddi, Emanuele, Coogan, R. T., Le Brun, Matthieu, Bournaud, F., Melin, J.-B, Riechers, D., Sargent, M., Valentino, Francesco Maria, Hwang, Helena, Finoguenov, Alexis, Strazzullo, Veronica, Gobat, R., Daddi, Emanuele, Coogan, R. T., Le Brun, Matthieu, Bournaud, F., Melin, J.-B, Riechers, D., Sargent, M., Valentino, Francesco Maria, Hwang, Helena, Finoguenov, Alexis, and Strazzullo, Veronica

Published
2019

4. Susceptibility of Legionella Strains to the Chlorinated Biocide, Monochloramine

Author

Jakubek, Delphine, Guillaume, Carole, Binet, Marie, Leblon, Gérard, DuBow, Michael, and Le Brun, Matthieu

Subjects
water cooling circuit, Disinfection, Nuclear Power Plants, Chloramines, Legionella, Articles, biocide, Water Microbiology, monochloramine, Disinfectants
Abstract

Members of the Legionella genus find suitable conditions for their growth and survival in nuclear power plant cooling circuits. To limit the proliferation of Legionella pathogenic bacteria in nuclear power plant cooling circuits, and ensure that levels remain below regulatory thresholds, monochloramine treatment can be used. Although the treatment is highly effective, i.e. it reduces Legionella numbers by over 99%, Legionella bacteria can still be detected at low concentrations and rapid re-colonisation of circuits can occur after the treatment has ceased. The aim of this study was to develop an in vitro methodology for determining the intrinsic susceptibility of L. pneumophila strains, collected from various nuclear power plant cooling circuits subjected to different treatment conditions. The methodology was developed by using an original approach based on response surface methodology (RSM) combined with a multifactorial experimental design. The susceptibility was evaluated by the Ct factor. The susceptibility of environmental strains varies widely and is, for some strains, greater than that of known tolerant species; however, strain susceptibility was not related to treatment conditions. Selection pressure induced by monochloramine use did not result in the selection of more tolerant Legionella strains and did not explain the detection of Legionella during treatment or the rapid re-colonisation of cooling circuits after disinfection has ceased.

Published
2013

5. Rapid detection and enumeration of Legionella pneumophila in hot water systems by solid-phase cytometry

Author

Aurell, Helena, Catala, Philippe, Farge, Pierre, Wallet, France, Le Brun, Matthieu, Helbig, Jurgen H., Lebaron, Philippe, and Jarraud, Sophie

Subjects
Microbiology -- Research, Legionella pneumophila -- Research, Biological sciences
Abstract

A new method for the rapid and sensitive detection of Legionella pneumophila in hot water systems is presented. Current methods for the detection of Legionella species are based on culture techniques and require at least 3 to 10 days.

Published
2004

6. Next-generation monitoring of aquatic biodiversity using environmental DNA metabarcoding

Author

Valentini, Alice, Taberlet, Pierre, Miaud, Claude, Civade, Raphaël, Herder, Jelger, Thomsen, Philip Francis, Bellemain, Eva, Besnard, Aurélien, Coissac, Eric, Boyer, Frédéric, Gaboriaud, Coline, Jean, Pauline, Poulet, Nicolas, Roset, Nicolas, Copp, Gordon H, Geniez, Philippe, Pont, Didier, Argillier, Christine, Baudoin, Jean-Marc, Peroux, Tiphaine, Crivelli, Alain Jean, Olivier, Anthony, Acqueberge, Manon, Le Brun, Matthieu, Møller, Peter Rask, Willerslev, Eske, Dejean, Tony, Valentini, Alice, Taberlet, Pierre, Miaud, Claude, Civade, Raphaël, Herder, Jelger, Thomsen, Philip Francis, Bellemain, Eva, Besnard, Aurélien, Coissac, Eric, Boyer, Frédéric, Gaboriaud, Coline, Jean, Pauline, Poulet, Nicolas, Roset, Nicolas, Copp, Gordon H, Geniez, Philippe, Pont, Didier, Argillier, Christine, Baudoin, Jean-Marc, Peroux, Tiphaine, Crivelli, Alain Jean, Olivier, Anthony, Acqueberge, Manon, Le Brun, Matthieu, Møller, Peter Rask, Willerslev, Eske, and Dejean, Tony

Abstract

Global biodiversity in freshwater and the oceans is declining at high rates. Reliable tools for assessing and monitoring aquatic biodiversity, especially for rare and secretive species, are important for efficient and timely management. Recent advances in DNA sequencing have provided a new tool for species detection from DNA present into the environment. In this study, we tested if an environmental DNA (eDNA) metabarcoding approach, using water samples, can be used for addressing significant questions in ecology and conservation. Two key aquatic vertebrate groups were targeted: amphibians and bony fish. The reliability of this method was cautiously validated in silico, in vitro, and in situ. When compared with traditional surveys or historical data, eDNA metabarcoding showed a much better detection probability overall. For amphibians, the detection probability with eDNA metabarcoding was 0.97 (CI = 0.90-0.99) versus 0.58 (CI = 0.50-0.63) for traditional surveys. For fish, in 89% of the studied sites, the number of taxa detected using the eDNA metabarcoding approach was higher or identical to the number detected using traditional methods. We argue that the proposed DNA-based approach has the potential to become the next-generation tool for ecological studies and standardized biodiversity monitoring in a wide range of aquatic ecosystems. This article is protected by copyright. All rights reserved.

Published
2016

8. The impact of monochloramine on the diversity and dynamics of Legionella pneumophila subpopulations in a nuclear power plant cooling circuit.

Author

Jakubek D, Le Brun M, Leblon G, DuBow M, and Binet M

Subjects
Biodiversity, Legionella pneumophila drug effects, Legionella pneumophila isolation & purification, Chloramines pharmacology, Disinfectants pharmacology, Legionella pneumophila classification, Nuclear Power Plants
Abstract

Members of the pathogenic Legionella genus encounter suitable growth conditions in nuclear power plant cooling circuits. To limit its proliferation and ensure that levels remain below regulatory thresholds, chemical treatment with monochloramine can be used in continuous or sequential conditions. The aim of this study was to determine the impact of monochloramine on L. pneumophila subpopulations in the cooling circuits of a nuclear power plant. The chosen procedure involved monitoring the diversity and dynamics of L. pneumophila subpopulations every month over the course of a year in a nuclear power plant cooling circuit, which was treated for 2 months during the period under study. This study confirmed the effectiveness of monochloramine to limit L. pneumophila concentrations in cooling circuits. The culturable L. pneumophila community was strongly affected by the injection of monochloramine. Several subpopulations persisted during treatment at low concentrations (below the detection limit of standard methods), suggesting that the susceptibility of L. pneumophila is strain dependent. Although the composition of the subpopulations was not similar, the resilience of the community structure was observed. Indeed, the community eventually returned to its initial structure and presented a similar pattern of richness, diversity and uniformity to that seen before treatment., (© 2013 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.)

Published
2013
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