Search results for: G. Ledoux

Items from 1 to 20 out of 27 results

article

A fatal endocarditis case due to an emerging bacterium: Moraxella nonliquefaciens

C. Duployez, C. Loïez, G. Ledoux, S. Armand, more

IDCases > 2017 > 8 > C > 12-13

Moraxella nonliquefaciens is a Gram-negative coccobacillus considered as a commensal organism from the upper respiratory tract, with low pathogenic potential. The phenotypical conventional identification is difficult and the matrix-assisted laser desorption/ionization time-of-flight technology has increased the resolution of identification of this bacterium. We report a fatal case of endocarditis...

article

Colonization pressure as a risk factor of ICU-acquired multidrug resistant bacteria: a prospective observational study

J. Masse, A. Elkalioubie, C. Blazejewski, G. Ledoux, more

European Journal of Clinical Microbiology & Infectious Diseases > 2017 > 36 > 5 > 797-805

The primary objective of this study was to evaluate the impact of colonization pressure on intensive care unit (ICU)-acquired multidrug resistant bacteria (MDRB). All patients hospitalized for more than 48 h in the ICU were included in this prospective observational study. MDRB were defined as methicillin resistant Staphylococcus aureus, Pseudomonas aeruginosa resistant to ceftazidime or imipenem,...

article

Impact of a targeted isolation strategy at intensive-care-unit-admission on intensive-care-unit-acquired infection related to multidrug-resistant bacteria: a prospective uncontrolled before–after study

G. Ledoux, S. Six, R. Lawson, J. Labreuche, more

Clinical Microbiology and Infection > 2016 > 22 > 10 > 888.e11-888.e18

Isolation of patients with multidrug resistant (MDR) bacteria is recommended to reduce cross-transmission of these bacteria. However, isolation of critically ill patients has several negative side effects. Therefore, we hypothesized that a targeted isolation strategy, based on the presence of at least one risk factor for MDR bacteria, would be not inferior to a systematic isolation strategy at intensive-care...

article

ESICM LIVES 2016: part one

L. Bos, L. Schouten, L. van Vught, M. Wiewel, more

Intensive Care Medicine Experimental > 2016 > 4 > 1 > 1-203

chapter

Multibeam Bathymetry Investigations of Mass Movements in Lake Le Bourget (NW Alps, France) Using a Portable Platform

G. Ledoux, P. Lajeunesse, E. Chapron, G. St-Onge

Advances in Natural and Technological Hazards Research > Submarine Mass Movements and Their Consequences > Submarine Mass Movements: Case Studies and Hazard Assessment > 423-434

Here we report on a recent survey undertaken on Lake Le Bourget (NW Alps, France) using a multibeam echosounder mounted on a portable and shallow-draft platform. The 3.6 × 2.8 m survey platform can be transported from one lake to another and deployed within a few hours. Its shallow draft allows surveying in areas as shallow as 3 m, while the multibeam echosounder allows maximum sounding depths of...

article

Pneumonie acquise sous ventilation mécanique : quoi de neuf en 2016 ?

E. Jaillette, G. Ledoux, R. Lawson, B. Misset, more

Médecine Intensive Réanimation > 2016 > 25 > 2 > 83-91

Résumé La prévention et la prise en charge des pneumonies acquises sous ventilation mécanique (PAVM) représentent un enjeu majeur dans la gestion des soins et demeurent au centre des préoccupations des médecins réanimateurs. L’évaluation des taux de PAVM est un indice de qualité des soins largement utilisé pour comparer les hôpitaux aux États-Unis. Des travaux récents ont mis en évidence que, selon...

article

Sédation légère chez les patients en insuffisance respiratoire aiguë

G. Ledoux, N. Terzi, E. Jaillette, R. Lawson, more

Médecine Intensive Réanimation > 2016 > 25 > 1 > 65-71

Résumé Une sédation de plus en plus légère est utilisée en soins intensifs pour limiter les effets secondaires de la sédation plus profonde (hémodynamiques, digestifs, neuropsychiatriques, neuromusculaires). Cette stratégie est-elle applicable lors de l’insuffisance respiratoire aiguë ? La sédation non maîtrisée a des effets délétères sur la mécanique ventilatoire, la variabilité de la fréquence respiratoire,...

article

Effects of vasoconstrictors on microcirculation

A. El Kalioubie, P. Overtchouk, G. Ledoux, R. Lawson, more

Médecine Intensive Réanimation > 2015 > 24 > 2 > 112-121

Physiology and animal models often predict microvascular negative effects of excessive vasoconstriction. The following are among them: a drop in capillary pressure (even closure of capillaries), a drop in microvascular haematocrit, a possible drop in flow, a possible decrease in capillary density. In fact, the impact of usual vasoconstrictors is difficult to predict, e.g. norepinephrine is an alpha...

article

Syndrome de Marfan et grossesse

S. Langlois, G. Ledoux, A. Le Roch, A.-F. Dalmas, more

Annales francaises d'anesthesie et de reanimation > 2013 > 32 > Supplement 1 > A364-A365

article

Hypertension artérielle et grossesse

S. Langlois, G. Ledoux, C. Roué, M. Pougeoise, more

Annales francaises d'anesthesie et de reanimation > 2013 > 32 > Supplement 1 > A364

article

Synthesis of Oxide Nanoparticles by Pulsed Laser Ablation in Liquids Containing a Complexing Molecule: Impact on Size Distributions and Prepared Phases

D. Amans, C. Malaterre, M. Diouf, C. Mancini, more

The Journal of Physical Chemistry C > 2011 > 115 > 12 > 5131 - 5139

article

Thin Film Growth Using Hetero Embryo: Demonstration on Pyrochlore Phase

A Pillonnet, V. Le Bihan, B. Masenelli, G. Ledoux, more

ACS Applied Materials & Interfaces > 2010 > 2 > 5 > 1543 - 1547

article

Probing the excitonic emission of ZnO nanoparticles using UV–VUV excitations

D. Tainoff, B. Masenelli, P. Melinon, A. Belsky, more

Journal of Luminescence > 2009 > 129 > 12 > 1798-1801

This study deals with the influence of the excitation (UV-lamp, UV-laser and VUV synchrotron radiation) on the 3.31eV band of ZnO microcrystals and of variously treated nanoparticles. The nanoparticles are synthesized in ultra high vacuum condition and their stoichiometry and crystallinity can be controlled. This provides an efficient way to probe the influence of these factors on the excitonic emission...

article

Rare-earth-based nanoclusters embedded in sol–gel waveguiding thin films

A. Pillonnet, J. Mugnier, V. Le Bihan, C. Leluyer, more

Journal of Luminescence > 2006 > 119-120 > Complete > 560-564

We present a new structural method for clusters analysis based on sol–gel planar waveguides and luminescent nanoparticles of Gd ₂ O ₃ :Eu ³⁺ . Clusters are deposited onto a TiO ₂ sol–gel layer then covered by a second TiO ₂ film. The resulting structure exhibits waveguiding properties.High-quality and large surface titanium oxide films are dip coated onto Pyrex...

article

Confinement effects in sesquioxydes

B. Mercier, C. Dujardin, G. Ledoux, C. Louis, more

Journal of Luminescence > 2006 > 119-120 > Complete > 224-227

When the size of a particle is decreased to nano-scales, confinement effects induce strong changes. The luminescence of Eu ³⁺ -doped Gd ₂ O ₃ nanoparticles has been studied as a function of both the temperature and the size of the nanoparticles.Two consequences of the small sizes in Eu ³⁺ -doped Gd ₂ O ₃ are observed. First the linewidth of the Eu ...

article

Transport properties and defects in silicon nanoparticles and effect of embedding in amorphous silicon layers

M.E. Gueunier-Farret, J.P. Kleider, F. Voigt, R. Brüggemann, more

Journal of Non-Crystalline Solids > 2006 > 352 > 9-20 > 1101-1104

We study the properties of silicon nanoparticles produced by CO ₂ laser pyrolysis of silane in a gas flow reactor, and the effect of sandwiching a thin layer of such particles between two a-Si:H layers. Contrary to the case of hydrogenated polymorphous silicon for which it is known that the electronic and stability properties can be enhanced compared to conventional hydrogenated amorphous...

article

Preparing nanometer scaled Tb-doped Y2O3 luminescent powders by the polyol method

M.A. Flores-Gonzalez, G. Ledoux, S. Roux, K. Lebbou, more

Journal of Solid State Chemistry > 2005 > 178 > 4 > 989-997

Sub-micrometer Tb-doped Y ₂ O ₃ luminescent powders were prepared from nitrate precursors using the polyol method. Just after precipitation, the powders consist of agglomerates with a spherical shape and a size ranging between 400 and 500nm. Each agglomerate is composed of ultra-small crystallites (from 3 to 6nm) of a bcc oxide phase whose luminescence presents original features in...

article

Elaboration of nanostructured Eu³⁺-doped Gd₂O₃ phosphor fine spherical powders using polyol-mediated synthesis

M.A. Flores-González, C. Louis, R. Bazzi, G. Ledoux, more

Applied Physics A > 2005 > 81 > 7 > 1385-1391

Red-emitting Eu³⁺-doped Gd₂O₃ spherical powders were directly precipitated using a polyol method. The as-synthesized powders consist of agglomerates with a spherical shape and a size ranging between 0.4 and 0.6 μm. Each agglomerate is nanostructured and consists of a packing of nanocrystallites (3–5 nm) of a bcc oxide phase whose luminescence presents original features in comparison with bulk materials...

article

Rare earth based clusters for nanoscale light source

B. Masenelli, P. Mélinon, D. Nicolas, E. Bernstein, more

The European Physical Journal D > 2005 > 34 > 1-3 > 139-143

. We investigate the fundamental properties of films resulting from the deposition of Eu³⁺ doped Gd₂O₃ clusters. We first report that the crystalline structure of clusters with diameter as low as 2.8 nm is still BCC (as in the bulk phase at ambient temperature and pressure). No phase transition to monoclinic structure is observed. We show that contamination from air (formation of hydroxide) is important...

article

Synthesis and properties of europium-based phosphors on the nanometer scale: Eu2O3, Gd2O3:Eu, and Y2O3:Eu

R Bazzi, M.A Flores, C Louis, K Lebbou, more

Journal of Colloid And Interface Science > 2004 > 273 > 1 > 191-197

Nanocrystals of oxides containing europium as the main constituent or as a doping element in RE ₂ O ₃ (RE=Y, Gd) have been prepared by direct oxide precipitation in high-boiling polyalcohol solutions and characterized by high-resolution TEM, absorption spectroscopy, and luminescence spectroscopy. The samples obtained consisted of concentrated and colloidally stable suspensions of luminescent...

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INFONA - science communication portal

Search results for: G. Ledoux

A fatal endocarditis case due to an emerging bacterium: Moraxella nonliquefaciens

Colonization pressure as a risk factor of ICU-acquired multidrug resistant bacteria: a prospective observational study

Impact of a targeted isolation strategy at intensive-care-unit-admission on intensive-care-unit-acquired infection related to multidrug-resistant bacteria: a prospective uncontrolled before–after study

ESICM LIVES 2016: part one

Multibeam Bathymetry Investigations of Mass Movements in Lake Le Bourget (NW Alps, France) Using a Portable Platform

Pneumonie acquise sous ventilation mécanique : quoi de neuf en 2016 ?

Sédation légère chez les patients en insuffisance respiratoire aiguë

Effects of vasoconstrictors on microcirculation

Syndrome de Marfan et grossesse

Hypertension artérielle et grossesse

Synthesis of Oxide Nanoparticles by Pulsed Laser Ablation in Liquids Containing a Complexing Molecule: Impact on Size Distributions and Prepared Phases

Thin Film Growth Using Hetero Embryo: Demonstration on Pyrochlore Phase

Probing the excitonic emission of ZnO nanoparticles using UV–VUV excitations

Rare-earth-based nanoclusters embedded in sol–gel waveguiding thin films

Confinement effects in sesquioxydes

Transport properties and defects in silicon nanoparticles and effect of embedding in amorphous silicon layers

Preparing nanometer scaled Tb-doped Y2O3 luminescent powders by the polyol method

Elaboration of nanostructured Eu³⁺-doped Gd₂O₃ phosphor fine spherical powders using polyol-mediated synthesis

Rare earth based clusters for nanoscale light source

Synthesis and properties of europium-based phosphors on the nanometer scale: Eu2O3, Gd2O3:Eu, and Y2O3:Eu

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