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See detailOzone tropospheric and stratospheric trends (1995-2011) at six ground- based FTIR stations (34°S to 79°N)
Vigouroux, Corinne; Demoulin, Philippe ULg; Hase, Frank et al

Poster (2011, November)

Five ground-based stations in Western Europe, from 79°N to 28°N, all part of the Network for the Detection of Atmospheric Composition Change (NDACC), have joined their efforts to homogenize and optimize ... [more ▼]

Five ground-based stations in Western Europe, from 79°N to 28°N, all part of the Network for the Detection of Atmospheric Composition Change (NDACC), have joined their efforts to homogenize and optimize the retrievals of ozone profiles from FTIR (Fourier transform infrared) solar absorption spectra. Using the optimal estimation method, distinct vertical information can be obtained in four layers: ground—10 km, 10—18 km, 18—27 km, and 27—42 km, in addition to total column amounts. A bootstrap resampling method has been implemented to determine annual partial and total column trends. Vigouroux et al. (2008) applied this method to the ozone data and discussed the trends of the total columns and of the partial columns in the above four layers, over the period 1995-2004. The updated trends for the 1995-2009 period has been published in the WMO 2010 report. Here, we present the updated trends for the 1995-mid-2011 period, for the five European stations but also for a southern hemisphere station, Wollongong (34°S), which recently joined this ozone network. [less ▲]

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See detailOzone tropospheric and stratospheric trends (1995-2011) at six ground-based FTIR stations (28°N to 79°N)
Vigouroux, Corinne; De Mazière, Martine; Demoulin, Philippe ULg et al

Poster (2012, August)

Five ground-based stations in Western Europe, from 79°N to 28°N, all part of the Network for the Detection of Atmospheric Composition Change (NDACC), have joined their efforts to homogenize and optimize ... [more ▼]

Five ground-based stations in Western Europe, from 79°N to 28°N, all part of the Network for the Detection of Atmospheric Composition Change (NDACC), have joined their efforts to homogenize and optimize the retrievals of ozone profiles from FTIR (Fourier transform infrared) solar absorption spectra. Using the optimal estimation method, distinct vertical information can be obtained in four layers: ground—10 km, 10—18 km, 18—27 km, and 27—42 km, in addition to total column amounts. Vigouroux et al. (2008) applied a bootstrap resampling method to the ozone data to determine the trends of the total columns and of the partial columns in the above four layers, over the period 1995-2004. The updated trends for the period 1995-2009 have been published in the WMO 2010 report. Here, we present the updated trends, obtained using the bootstrap resampling method, for the 1995-mid-2011 period, for the five European stations and also for the station Thule, Greenland (77°N), which has joined this effort. The trends have also been estimated using a multiple regression model including the Quasi Biennial Oscillation (QBO) and the solar flux as explanatory variables. The trends obtained by the two methods will be compared and discussed. One of the major results is the significant positive trend observed in the upper stratosphere at the station Jungfraujoch (47°N), which provides a sign of ozone recovery at mid-latitudes. Significant positive trends are also observed in the upper stratosphere at the high latitude stations. [less ▲]

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See detailOzone tropospheric and stratospheric trends (1995-2012) at six ground-based FTIR stations (28°N to 79°N)
Vigouroux, Corinne; De Mazière, Martine; Demoulin, Philippe ULg et al

Poster (2013, April)

In the frame of the Network for the Detection of Atmospheric Composition Change (NDACC), contributing ground-based stations have joined their efforts to homogenize and optimize the retrievals of ozone ... [more ▼]

In the frame of the Network for the Detection of Atmospheric Composition Change (NDACC), contributing ground-based stations have joined their efforts to homogenize and optimize the retrievals of ozone profiles from FTIR (Fourier transform infrared) solar absorption spectra. Using the optimal estimation method, distinct vertical information can be obtained in four layers: ground-10 km, 10-18 km, 18-27 km, and 27-42 km, in addition to total column amounts. In a previous study, Vigouroux et al. (2008) applied a bootstrap resampling method to determine the trends of the ozone total and four partial columns, over the period 1995-2004 at Western European stations. The updated trends for the period 1995-2009 have been published in the WMO 2010 report. Here, we present the updated trends and their uncertainties, for the 1995-2012 period, for the different altitude ranges, above five European stations (28°N-79°N) and above the station Thule, Greenland (77°N). In this work, the trends have been estimated using a multiple regression model including some explanatory variables responsible for the ozone variability, such as the Quasi Biennial Oscillation (QBO), the solar flux, the Arctic Oscillation (AO) or El Niño-Southern Oscillation (ENSO). A major result is the significant positive trend of ozone in the upper stratosphere, observed at the Jungfraujoch (47°N), which is a typical mid-latitude site, as well as at the high latitude stations. This positive trend in the upper stratosphere at Jungfraujoch provides a sign of ozone recovery at mid-latitudes. [less ▲]

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See detailOZONE, CLIMATE AND BIOSPHERIC ENVIRONMENT IN THE ANCIENT OXYGEN-POOR ATMOSPHERE
François, Louis ULg; Gérard, Jean-Claude ULg

in Planetary and Space Science (1988), 36(12), 1391-1414

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See detailOzone-Depleting Substances (ODSs) and Related Chemicals (Chapter 1)
Montzka, S. A.; Reimann, S.; Engel, A. et al

in Nohende Ajavon, Ayité-Lô; Newmann, Paul A.; Pyle, John A. (Eds.) et al Scientific Assessment of Ozone Depletion: 2010 (2011)

The amended and adjusted Montreal Protocol continues to be successful at reducing emissions and atmospheric abundances of most controlled ozone-depleting substances (ODSs).

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See detailOzone-Induced Stimulation of Pulmonary Sympathetic Fibers: A Protective Mechanism against Edema
Delaunois, Annie ULg; Segura, P.; Dessy, Cécile ULg et al

in Toxicology and Applied Pharmacology (1997), 147(1), 71-82

Tropospheric ozone exerts well-described toxic effects on the respiratory tract. Less documented, by contrast, is the ability of ozone to induce protective mechanisms against agents that are toxic to the ... [more ▼]

Tropospheric ozone exerts well-described toxic effects on the respiratory tract. Less documented, by contrast, is the ability of ozone to induce protective mechanisms against agents that are toxic to the lungs. In particular, interactions between ozone and the sympathetic nervous system have never been considered. Using a model of permeability edema in isolated perfused rabbit lungs, we report here that, immediately after exposure of rabbits to 0.4 ppm ozone for 4 hr, the pulmonary microvascular responses to acetylcholine and substance P are completely blocked. Several lines of evidence, including partial inhibition of the ozone-induced protective effect by several drugs (alpha2- and beta-adrenergic antagonists, neuropeptide Y antagonist, guanethidine), measured levels of released catecholamines in blood and urine and the in vitro response of isolated lungs exposed to 0.4 ppm ozone all seem to suggest that ozone can stimulate pulmonary adrenergic fibers and induce the local release of catecholamines and neuropeptide Y, this resulting in transient protection against pulmonary edema. We also showed that, 48 hr after the exposure, ozone increased the baseline microvascular permeability and the response to low concentrations of acetylcholine [less ▲]

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See detailL'ozone: une alternative au traitement chirurgical de la carie ?
Guéders, Audrey; Geerts, Sabine ULg

in Actualités Dentaires de l'Université de Liège (2007), 37

L'ozone possède des propriétés intéressantes tant dans le domaine médical que dans le domaine de la dentisterie. Ce gaz est capable d'éradiquer un certain nombre de bactéries, de virus et de champignons ... [more ▼]

L'ozone possède des propriétés intéressantes tant dans le domaine médical que dans le domaine de la dentisterie. Ce gaz est capable d'éradiquer un certain nombre de bactéries, de virus et de champignons après seulement 5 secondes de son application. Depuis quelques années, la firme Kavo propose un disposif (HealOzone®) générateur d'ozone spécialement conçu pour traiter les lésions carieuses non cavitaires. Cet article fait le point sur les connaissances actuelles concernant l'utilisation de l'ozone dans le traiement des caries débutantes. [less ▲]

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See detailp-[18F]MPPF, 5-HT1A antagonist: comparison to [3H]8-OH-DPAT with autoradiography
Plenevaux, Alain ULg; Weissmann, D.; Lemaire, Christian ULg et al

in Society for Neuroscience / Abstracts (1999)

p-MPPF 4-(2’-methoxyphenyl)-1-[2’-[N-(2’’-pyridinyl)-p-fluorobenzamido] ethyl]piperazine is the para-fluorobenzoyl analog of the highly selective 5-HT1A antagonist WAY-100635. The one step procedure used ... [more ▼]

p-MPPF 4-(2’-methoxyphenyl)-1-[2’-[N-(2’’-pyridinyl)-p-fluorobenzamido] ethyl]piperazine is the para-fluorobenzoyl analog of the highly selective 5-HT1A antagonist WAY-100635. The one step procedure used to label p-MPPF with fluorine-18 (cyclotron produced positron emitter of 110 min half-life) leads to a radiopharmaceutical compound easily prepared on a large scale. The preliminary evaluations conducted in rats and cats are good reason to consider p-[18F]MPPF as an interesting reversible radioligand to study the 5-HT1A receptor family in humans with positron emission tomography (PET). In this paper we report a careful comparison between p-[18F]MPPF and [3H]8-OH-DPAT with autoradiography and quantitative densitometry in the same animal. All experiments were conducted in Sprague Dawley male rats. For p-[18F]MMPF, the results were obtained ex-vivo after an intravenous injection of high specific activity radioligand (0.8-1.5 Ci/µmol) in vigil (no anesthesia), free moving and unstressed animals. For the purpose, permanent cannulation of the posterior vena cava were realized at least four days in advance. The [3H]8-OH-DPAT results were obtained in vitro on adjacent coronal sections to the one used for the p-[18F]MPPF autoradiography. Quantitative densitometry was employed to compare the values obtained in relevant brain structures (frontal cortex, lateral septum, hippocampus, dorsal raphe, entorhinal cortex and cerebellum). The plot of the p-[18F]MPPF values obtained for each structure against the [3H]8-OH-DPAT results displayed a significant linear correlation. These results demonstrate that from a qualitative as well as quantitative point of view, the binding of p-[18F]MPPF is totally comparable to the one of [3H]8-OH-DPAT. Supported by grants from INSERM/CGRI and FNRS Belgium. [less ▲]

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See detailp-[18F]MPPF, a fluoro analog of WAY-100635 for visualisation of 5-HT1A receptors in cat.
Le Bars, D.; Ginovart, N.; Hassoun, W. et al

in Journal of Labelled Compounds & Radiopharmaceuticals (1999), 42

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See detailLe p-[18F]MPPF: un nouveau ligand pour l'étude par TEP des récepteurs 5-HT1A
Ginovart, Nathalie; Le Bars, Didier; Lemaire, Christian ULg et al

Poster (1997, May 25)

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See detailp-mode Oscillations of alpha Cen A
Thoul, Anne ULg; Scuflaire, Richard ULg; Vatovez, B. et al

in Astrophysics & Space Science (2003), 284

Models of alpha Cen A & B have been computed using the masses determined by Pourbaix et al. (2002) and the data derived from the spectroscopic analysis of Neuforge and Magain (1997). The seismological ... [more ▼]

Models of alpha Cen A & B have been computed using the masses determined by Pourbaix et al. (2002) and the data derived from the spectroscopic analysis of Neuforge and Magain (1997). The seismological data obtained by Bouchy and Carrier (2001, 2002) do help improve our knowledge of the evolutionary status of the system. All the constraints are satisfied with a model which gives an age of about 6 Gyr for the binary. [less ▲]

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See detailP. Colon. Inv. 4781 verso: vente d'une esclave
Straus, Jean ULg

in Zeitschrift für Papyrologie und Epigraphik (1993), 98

Edition du contrat de vente d'une esclave. Papyrus grec d'Egypte. Ptolémaïs Euergétis, 3 décmebre 65

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See detailP. H. Liotta, the Graveyard of Fallen Monuments
Delville, Michel ULg

in Sentence: A Journal of Prose Poetics (2008), 7

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See detailLe P. Vindob. L 150 et les "glossaires" virgiliens
Rochette, Bruno ULg

in Chronique d'Egypte : Bulletin Périodique de la Fondation Egyptologique Reine Elisabeth (1989), 64(127-128), 231-234

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See detailLa P.E.B. expliquée
Delnoy, Michel ULg

in Delnoy, Michel; Hauglustaine, Jean-Marie; Levaux, Jean-Baptiste (Eds.) La P.E.B. expliquée (2009)

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See detailP.E.T.R.A.E. : une banque de données des inscriptions grecques et latines
Denooz, Joseph ULg

in Archéo-log (1988), 3

Detailed reference viewed: 17 (3 ULg)