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See detailOccurrence of the multicolored ladybird, Harmonia axyridis PALLAS in Walloon agro-ecosystems
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

Conference (2010, May 05)

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted ... [more ▼]

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted to temperate climate conditions and to spread out all over Europe. Now, H. axyridis is one of the coccinellid with the biggest size in Belgium, causing damages to the ecosystems through e.g. intraguild predation (IGP). We are still lacking information about the consequences of the introduction of this superpredator in our agro-ecosystems. This work focuses on the potential impacts of H. axyridis on the entomofauna associated with several crops (potatos, corn, wheat, broad bean). We evaluated in 2009 the occurrence as well as the interactions between aphids and their natural enemies (hoverflies, coccinellids and lacewings) in several agro-ecosystem sites in northern Wallonia. After one year of field observations, were found thirteen coccinellid species, most of the catched individuals being H. axyridis with 64% of the coccinellids, Propylea 14-punctata, 15%, or Coccinella 7-punctata, 14%. This invasive ladybird dominates the group of coccinellids generally in all crops in north Wallonia. The results with the sticky traps show that the maximum occurrence of H. axyridis in crops is observed in chicory, sugar beet and potatoes. The relationship aphid-ladybird in wheat for example, brings out that increase of density of Asian ladybird in mid-July follow the increase of aphids (Sitobion avenae, Sitobion fragariae, Metopolophium dirhodum, Aphis fabae) in the end of June. We also observe that, in most agro-ecosystems, hoverflies and lacewings are the dominant aphid natural enemies. In all crops investigate, the multicolored ladybird occurs with 5% of the aphidophagous after the Chrysopidae, 12% and the Syrphidae, 76%. In 2009, the agro-ecosystems with the most aphidophagous species are carrot and broad bean and these habitats are dominated by hoverflies. [less ▲]

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See detailThe occurrence of the NII 4176 Å emission line in connection with type-B auroras
Gérard, Jean-Claude ULg; Harang, Ove E

in Planetary and Space Science (1969), 17

Not Available

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See detailOcean biogeochemical cycles and climate sensitivity in an Earth system model
Mouchet, Anne ULg; Loutre, M. F.; Fichefet, T. et al

Conference (2008, October)

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See detailOcean biogeochemical cycles and climate sensitivity in an Earth system model
Mouchet, Anne ULg; Loutre, M. F.; Fichefet, T. et al

Conference (2008, April)

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See detailThe ocean bomb radiocarbon inventory revisited
Mouchet, Anne ULg

in Radiocarbon (2013), 55(2-3), 1580-1594

Large discrepancies exist among data-based estimates and model reconstructions of the ocean bomb radiocarbon inventory. In order to resolve this gap, it has been proposed that the CO2 piston veloc- ity ... [more ▼]

Large discrepancies exist among data-based estimates and model reconstructions of the ocean bomb radiocarbon inventory. In order to resolve this gap, it has been proposed that the CO2 piston veloc- ity should be revised downward (Sweeney et al., 2007; Müller et al., 2008). Here we compare the transient 14C distributions in the ocean obtained with different formulations of the isotopic ratio commonly used in modeling studies. It is found that both the CO2 increase and the air-sea CO2 flux significantly contribute to the 1990 ocean bomb radiocarbon inventory, by around 10% each. Moreover, these two processes explain more than 25% of the inventory difference be- tween 1974 and 1990. These results imply that, as already argued by Naegler (2009), inventories based on observations which lack infor- mation about CO2 invasion are underestimated. Further, this work allows to gain insight into the reasons for discrepancies among model results. It suggests that while a comprehensive isotopic formulation is needed when addressing the global radiocarbon cycle, a simplified form is more relevant for model calibration and piston velocity assess- ment based on currently available bomb radiocarbon inventories. [less ▲]

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See detailL’océan borderline, troubles des états limites, récits de voyage. Cancrini, L. (2009). Bruxelles, De Boeck
Aubinet, Suzanne ULg

in Carnet de notes sur les maltraitances infantiles (2013), 131(1), 22

L’ouvrage de Luigi Cancrini, l’Océan Borderline, et le regard nouveau, complexe et intégré qu’il propose nous semble une ressource intéressante et riche pour la prise en charge et la réflexion sur les ... [more ▼]

L’ouvrage de Luigi Cancrini, l’Océan Borderline, et le regard nouveau, complexe et intégré qu’il propose nous semble une ressource intéressante et riche pour la prise en charge et la réflexion sur les situations cliniques de maltraitance. Au sein de son ouvrage où il conceptualise les troubles borderline sous la forme d’un océan entouré de deux continents, la névrose et la psychose, l’auteur défend l’idée que les difficultés psychopathologiques des individus se référeraient bien plus à un fonctionnement contextuel et ponctuel qu’à une structure fixe et atemporelle de la personnalité. [less ▲]

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See detailOceanic forcing of Antarctic climate change: A study using a stretched-grid atmospheric general circulation model
Krinner, Gerhard; Largeron, Chloé; Ménégoz, Martin et al

in Journal of Climate (in press)

A variable-resolution atmospheric general circulation model (AGCM) is used for climate change projections over the Antarctic. The present-day simulation uses prescribed observed sea-surface conditions ... [more ▼]

A variable-resolution atmospheric general circulation model (AGCM) is used for climate change projections over the Antarctic. The present-day simulation uses prescribed observed sea-surface conditions, while a set of five simulations for the end of the 21st century (2070-2099) under the SRES-A1B scenario uses sea- surface condition anomalies from selected CMIP3 coupled ocean-atmosphere climate models. Analysis of the results shows that the prescribed sea-surface condition anomalies have a very strong influence on the simulated climate change on the Antarctic continent, largely dominating the direct effect of the prescribed greenhouse gas concentration changes in the AGCM simulations. Complementary simulations with idealized forcings confirm these results. An analysis of circulation changes using self-organizing maps shows that the simulated climate change on regional scales is not principally caused by shifts of the frequencies of the dominant circulation patterns, except for precipitation changes in some coastal regions. The study illustrates that in some respects the use of bias-corrected sea- surface boundary conditions in climate projections with a variable-resolution atmospheric general circulation model has some distinct advantages over the use of limited-area atmospheric circulation models directly forced by generally biased coupled climate model output. [less ▲]

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See detailOCEANIC POLYMETALLIC NODULES - A CATALYST FOR HYDROTREATMENT OF PETROLEUM RESIDUES
Dodet, Claude ULg; Noville, Francis ULg; Crine, Michel ULg et al

in Acta Chimica Hungarica-Models In Chemistry (1987), 124(1), 65-72

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See detailOceanic polymetallic nodules : a catalyst for hydrotreatment of petroleum residua
Dodet, Claude ULg; Noville, Francis ULg; Crine, Michel ULg et al

in Acta Chimica Hungarica (1987), 124

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See detailOceanic sources, sinks, and transport of atmospheric CO2
Gruber, Nicolas; Gloor, Manuel; Fletcher, Sara E Mikaloff et al

in Global Biogeochemical Cycles (2009), 23

We synthesize estimates of the contemporary net air-sea CO2 flux on the basis of an inversion of interior ocean carbon observations using a suite of 10 ocean general circulation models (Mikaloff Fletcher ... [more ▼]

We synthesize estimates of the contemporary net air-sea CO2 flux on the basis of an inversion of interior ocean carbon observations using a suite of 10 ocean general circulation models (Mikaloff Fletcher et al., 2006, 2007) and compare them to estimates based on a new climatology of the air-sea difference of the partial pressure of CO2 (pCO(2)) (Takahashi et al., 2008). These two independent flux estimates reveal a consistent description of the regional distribution of annual mean sources and sinks of atmospheric CO2 for the decade of the 1990s and the early 2000s with differences at the regional level of generally less than 0.1 Pg C a(-1). This distribution is characterized by outgassing in the tropics, uptake in midlatitudes, and comparatively small fluxes in the high latitudes. Both estimates point toward a small(similar to -0.3 Pg C a(-1)) contemporary CO2 sink in the Southern Ocean (south of 44 degrees S), a result of the near cancellation between a substantial outgassing of natural CO2 and a strong uptake of anthropogenic CO2. A notable exception in the generally good agreement between the two estimates exists within the Southern Ocean: the ocean inversion suggests a relatively uniform uptake, while the pCO(2)-based estimate suggests strong uptake in the region between 58 degrees S and 44 degrees S, and a source in the region south of 58 degrees S. Globally and for a nominal period between 1995 and 2000, the contemporary net air-sea flux of CO2 is estimated to be -1.7 +/- 0.4 Pg C a(-1) (inversion) and -1.4 +/- 0.7 Pg C a(-1) (pCO(2)-climatology), respectively, consisting of an outgassing flux of river-derived carbon of similar to+0.5 Pg C a(-1), and an uptake flux of anthropogenic carbon of -2.2 +/- 0.3 Pg C a(-1) (inversion) and -1.9 +/- 0.7 Pg C a(-1) (pCO(2)-climatology). The two flux estimates also imply a consistent description of the contemporary meridional transport of carbon with southward ocean transport throughout most of the Atlantic basin, and strong equatorward convergence in the Indo-Pacific basins. Both transport estimates suggest a small hemispheric asymmetry with a southward transport of between -0.2 and -0.3 Pg C a(-1) across the equator. While the convergence of these two independent estimates is encouraging and suggests that it is now possible to provide relatively tight constraints for the net air-sea CO2 fluxes at the regional basis, both studies are limited by their lack of consideration of long-term changes in the ocean carbon cycle, such as the recent possible stalling in the expected growth of the Southern Ocean carbon sink. [less ▲]

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See detailL'océanographie , c'est quoi?
Gobert, Sylvie ULg

Conference given outside the academic context (2012)

Présentation de l'océanographie: définition, notion de base, histoire de l'océanographie à Liège

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See detailOceanological applications of stable isotope ratios
Dauby, Patrick ULg

Scientific conference (1997, November)

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See detailLes océans malades des hommes - Portrait
Devuyst, Paul; Das, Krishna ULg

Article for general public (2009)

Portrait de Krishna Das par Mr Paul Devuyst "Krishna Das, chercheuse au laboratoire d’océanologie de l’Université de Liège, dans le service du professeur Jean-Marie Bouquegneau, s’intéresse aux niveaux et ... [more ▼]

Portrait de Krishna Das par Mr Paul Devuyst "Krishna Das, chercheuse au laboratoire d’océanologie de l’Université de Liège, dans le service du professeur Jean-Marie Bouquegneau, s’intéresse aux niveaux et aux effets des polluants toxiques tels que les métaux lourds et autres composés organiques qui s’accumulent dans les tissus de plusieurs espèces marines de poissons, reptiles, oiseaux et mammifères." [less ▲]

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See detailOcena skutecznosci napraw – wplyw jakosci podkladu betonowego
Czarnecki, Lech; Courard, Luc ULg; Garbacz, Andzej

in Inzynieria i Budownictwo (Engineering and Building Industry) (2007), 12

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See detailThe OCS Molecule. The Photoabsorption Spectrum. The Threshold Photoelectron and CIS-photoelectron Spectra.
Locht, Robert ULg; Hottmann, K.; Baumgärtel, H.

Book published by Berliner Elektronen Speicherring für Synchrotron Strahlung m.b.H (1994)

Using synchrotron radiation the threshold-, the CIS- and the 21.22 eV-photoelectron spectra are reported. This investigation has been completed by recording the VUV photoabsorption spectrum.

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See detailOctarellin VI: using rosetta to design a putative artificial (beta/alpha)8 protein.
Figueroa Yévenes, Maximiliano ULg; Oliveira, Nicolas; Lejeune, Annabelle et al

in PloS one (2013), 8(8), 71858

The computational protein design protocol Rosetta has been applied successfully to a wide variety of protein engineering problems. Here the aim was to test its ability to design de novo a protein adopting ... [more ▼]

The computational protein design protocol Rosetta has been applied successfully to a wide variety of protein engineering problems. Here the aim was to test its ability to design de novo a protein adopting the TIM-barrel fold, whose formation requires about twice as many residues as in the largest proteins successfully designed de novo to date. The designed protein, Octarellin VI, contains 216 residues. Its amino acid composition is similar to that of natural TIM-barrel proteins. When produced and purified, it showed a far-UV circular dichroism spectrum characteristic of folded proteins, with alpha-helical and beta-sheet secondary structure. Its stable tertiary structure was confirmed by both tryptophan fluorescence and circular dichroism in the near UV. It proved heat stable up to 70 degrees C. Dynamic light scattering experiments revealed a unique population of particles averaging 4 nm in diameter, in good agreement with our model. Although these data suggest the successful creation of an artificial alpha/beta protein of more than 200 amino acids, Octarellin VI shows an apparent noncooperative chemical unfolding and low solubility. [less ▲]

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See detailL'octave de la Trinité du calendrier liégeois. Chronologie et liturgie.
Close, Florence ULg

in Moyen Age (Le) (2004), CX(3-4), 627-641

The Pope's increasing authority in the middle of the 11th century led to a change in the relative status of the liturgical feasts that were celebrated in various European dioceses. From the second half of ... [more ▼]

The Pope's increasing authority in the middle of the 11th century led to a change in the relative status of the liturgical feasts that were celebrated in various European dioceses. From the second half of the 11th to the 14th centuries there was a disagreement between those who, according to the Roman custom, considered that the celebration of the Whitsun octave prevailed and those who stood up for the celebration of the Trinity Sunday octave. In order to give each of these feasts its proper solemnity some dioceses in the Holy Empire swapped Trinity Sunday and the Sunday of its octave celebration. The Liège diocese was one of them. Such permutation, wich often went unnoticed, was a frequent source of uncertainty about dates, notably about the original date of Corpus Christi. [less ▲]

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See detailOctreotide (long-acting release formulation) treatment in patients with graves' orbitopathy: clinical results of a four-month, randomized, placebo-controlled, double-blind study.
Wemeau, J. L.; Caron, P.; Beckers, Albert ULg et al

in Journal of Clinical Endocrinology and Metabolism (2005), 90(2), 841-848

There are few effective, safe modalities for the management of Graves' ophthalmopathy (GO), a cell-mediated immune comorbidity of thyroid disease. Somatostatin analogs inhibit lymphocyte proliferation and ... [more ▼]

There are few effective, safe modalities for the management of Graves' ophthalmopathy (GO), a cell-mediated immune comorbidity of thyroid disease. Somatostatin analogs inhibit lymphocyte proliferation and activation, and accumulate in the orbital tissue of patients with GO. A double-blind, placebo-controlled study of a long-acting somatostatin analog [16 wk of long-acting release formulation of octreotide (octreotide-LAR)] was conducted in 51 patients with mild active GO with the aim of preventing deterioration and precluding the need for more aggressive therapeutic modalities, such as glucocorticoids or radiotherapy. No treatment effect was observed for the primary end point (a composite parameter defining the outcome as either success or failure on the basis of changes in class/grade of the severity index and Clinical Activity Scale of GO). The Clinical Activity Scale score was reduced for patients treated with octreotide-LAR, but without any significant difference with respect to patients receiving placebo. However, octreotide-LAR significantly reduced proptosis (as measured by exophthalmometry). This was associated with nonsignificant differences in favor of octreotide-LAR in a series of proptosis-related parameters: class III grade, opening of the upper eyelid, the difference in ocular pressure between primary position and upgaze, and extraocular muscle involvement. By magnetic resonance imaging evaluation the extraocular muscle volumes appeared reduced, but nonsignificantly. No significant correlation between the initial uptake of the somatostatin analog indium-labeled and the response to treatment was observed. One patient in the octreotide-LAR group developed gallstones. In this study, octreotide-LAR did not seem suitable to mitigate activity in mild GO. Surprisingly, it significantly reduced proptosis, one of the most debilitating symptoms of GO. Additional studies are warranted to define the benefit to risk ratio of the somatostatin analogs in this indication. [less ▲]

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See detailL'octréotide LP dans le traitement des ophtalmopathies basedowiennes incipiens : Evaluation prospective VS placebo
Wemeau, J. L.; Caron, P.; Rohmer, V. et al

in XXIème Congrès de la Société Française d'Endocrinologie - Abstract book (2004)

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