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See detailHow shattered flakes were used : Micro-wear analysis of quartz flake fragments
Knutsson, Helena; Knutsson, Kjel; Taipale, Noora ULg et al

in Journal of Archaeological Science: Reports (2015), 2

Prehistoric quartz assemblages have always posed a special problem for archaeologists. Due to its brittle nature, quartz is hard to understand within lithic classification systems that are based on ... [more ▼]

Prehistoric quartz assemblages have always posed a special problem for archaeologists. Due to its brittle nature, quartz is hard to understand within lithic classification systems that are based on formally varied flint assemblages. In this paper we explore ways to deal with this problem by applying two analytical methods, fracture analysis and use-wear analysis. A sample of 544 unmodified quartz flakes and flake fragments from Mesolithic and Neolithic sites in Sweden and Finland was analysed. It can be concluded that both whole and fragmented flakes were used as tools. Larger flakes and flake fragments were preferred as tool blanks and the type of use was correlated to variation in edge qualities rather than the formal characteristics of flakes. The results of this investigation suggest that making behavioural inferences from quartz assemblages with low formal variability requires the assemblages to be approached with a focus on functional types. [less ▲]

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See detailAcetylene (C2H2) and hydrogen cyanide (HCN) from IASI satellite observations: global distributions, validation, and comparison with model
Duflot, V.; Wespes, C.; Clarisse, L. et al

in Atmospheric Chemistry & Physics Discussions (2015), 15(10), 14357--14401

We present global distributions of C2H2 and HCN total columns derived from the Infrared Atmospheric Sounding Interferometer (IASI). These distributions are obtained with a fast method allowing to retrieve ... [more ▼]

We present global distributions of C2H2 and HCN total columns derived from the Infrared Atmospheric Sounding Interferometer (IASI). These distributions are obtained with a fast method allowing to retrieve C2H2 abundance globally with a 5% precision and HCN abundance in the tropical (subtropical) belt with a 10% (30%) precision. IASI data are compared for validation purposes with ground-based Fourier Transform Infrared (FTIR) spectrometer measurements at four selected stations. We show that there is an overall agreement between the ground-based and space measurements. Global C2H2 and subtropical HCN abundances retrieved from IASI spectra show the expected seasonality linked to variations in the anthropogenic emissions and seasonal biomass burning activity, as well as exceptional events, and are in good agreement with previous spaceborne studies. IASI measurements are also compared to the distributions from the Model for Ozone and Related Chemical Tracers, version 4 (MOZART- 4). Seasonal cycles observed from satellite data are reasonably well reproduced by the model. However, the model seems to overestimate (underestimate) anthropogenic (biomass burning) emissions and a negative global mean bias of 1% (16 %) of the model relative to the satellite observations was found for C2H2 (HCN). [less ▲]

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See detailAgroecology: Unity into diversity
Hatt, Séverin ULg; Artru, Sidonie ULg; Boeraeve, Fanny ULg et al

Poster (2015, May 21)

What does agroecology suggest ? Next to the theoretical agroecological principles, we present illustrative examples from farming practices, through the food system, up to the way of carrying agricultural ... [more ▼]

What does agroecology suggest ? Next to the theoretical agroecological principles, we present illustrative examples from farming practices, through the food system, up to the way of carrying agricultural research and education. [less ▲]

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See detailAnatomy of the pelvis re-designed
Bonnet, Pierre ULg

Conference (2015, May 21)

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See detailInvestigation of the consistency of the recent CH4 increase derived from NDACC-FTIR, ACE-FTS and GEOS-Chem
Bader, Whitney ULg; Conway, Stephanie; Strong, Kim et al

Conference (2015, May 21)

We present an update on the status of the recent methane increase study based on six FTIR ground-based sites, ACE-FTS satellite occultations and GEOS-Chem simulation.

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See detail"Tell me about Self." Clarté de soi et souvenirs définissant le soi: Particularités du self chez des individus souffrant d'un trouble de l'humeur
Boulanger, Marie ULg; Wagener, Aurélie ULg; Blairy, Sylvie ULg

Poster (2015, May 21)

The present study focusses on a particular kind of autobiographical memories called self-defining memories (SDMs). SDMs are highly pertinent for self-building because they help to define in the most ... [more ▼]

The present study focusses on a particular kind of autobiographical memories called self-defining memories (SDMs). SDMs are highly pertinent for self-building because they help to define in the most clearly way our perception of ourselves. If literature showed that depressed and bipolar patients suffer from autobiographical memory (AM) disturbances, SDMs have not been studied a lot since yet in these two disorders. Then, the present study pursues two main aims: (1) to assess SDM’s characteristics and (2) to assess the relationship between the ability to retrieve SDM’s and self-concept clarity. To reach our objective, 17 depressed and 16 bipolar patients are compared to 17 healthy subjects. Participants are asked to complete SDMs procedure that is recalling six important events which happened in their life. These SDMs are assessed on four variables: specificity, impact, valence, meaning making, contain. Self-concept clarity and mood are also assessed. Preliminary results do not highlight difference between our groups on specificity. Marginal effects appear for meaning making with healthy subjects recalling more meaning making events. Results show that depressed patients present a mood congruence. The final results will be presented during the convention, as data-collection is on-going and will end in April. Experimental and clinical implications of our results will be discussed. [less ▲]

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See detailInnovation alimentaire : Retour vers le futur
Goffin, Dorothée ULg

Conference given outside the academic context (2015)

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See detailOn the use of the transmission disequilibrium test to detect pseudo-autosomal variants affecting traits with sex-limited expression
Elansary, Mahmoud ULg; Stinckens, Anneleen; Ahariz, Naïma ULg et al

in Animal Genetics (2015)

We herein describe the realization of a genome-wide association study for scrotal hernia and cryptorchidism in Norwegian and Belgian commercial pig populations. We have used the transmission ... [more ▼]

We herein describe the realization of a genome-wide association study for scrotal hernia and cryptorchidism in Norwegian and Belgian commercial pig populations. We have used the transmission disequilibrium test to avoid spurious associations due to population stratification. By doing so, we obtained genome-wide significant signals for both diseases with SNPs located in the pseudo-autosomal region in the vicinity of the pseudo-autosomal boundary. By further analyzing these signals, we demonstrate that the observed transmission disequilibria are artifactual. We determine that transmission bias at pseudo-autosomal markers will occur (i) when analyzing traits with sex-limited expression and (ii) when the allelic frequencies at the marker locus differ between X and Y chromosomes. We show that the bias is due to the fact that (i) sires will preferentially transmit the allele enriched on the Y (respectively X) chromosome to affected sons (respectively daughters) and (ii) dams will appear to preferentially transmit the allele enriched on the Y (respectively X) to affected sons (respectively daughters), as offspring inheriting the other allele are more likely to be non-informative. We define the conditions to mitigate these issues, namely by (i) extracting information from maternal meiosis only and (ii) ignoring trios for which sire and dam have the same heterozygous genotype. We show that by applying these rules to scrotal hernia and cryptorchidism, the pseudo-autosomal signals disappear, confirming their spurious nature. [less ▲]

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See detailCombining remote sensing and ancillary data to improve species distribution models
Delangre, Jessica ULg; Radoux, Julien; Jacquemin, Floriane ULg et al

Poster (2015, May 21)

Correlative distribution models are increasingly used in biological conservation. They often require the compilation of various environmental attributes (climate, topography, land cover,…), which can be ... [more ▼]

Correlative distribution models are increasingly used in biological conservation. They often require the compilation of various environmental attributes (climate, topography, land cover,…), which can be very time-consuming. In the Lifewatch project, a database combining segmentation in homogeneous landscape units (“ecotopes”) and environmental attributes derived from regularly updated remote sensing data (land cover, potential solar energy,…) and other data sources (climate, topography,…) has been designed. Our aim was to assess the usefulness of this database for species distribution modelling and to propose further improvements. The distribution of ten species (four butterflies, three birds, two reptiles and one mammal) was modelled across Wallonia and model performance was assessed by Area Under the ROC Curve using the subsample approach. The models derived from ecotope segmentation and quantitative land cover attributes were compared to those obtained with a corresponding grid and a qualitative land cover database. The usefulness of ancillary data (soil properties, contextual attributes) was assessed to decide which variables should be integrated in the ecotope database. The results allowed us to assess and improve the relevance and accuracy of our database, which is a promising tool for species distribution modellers at the European scale. [less ▲]

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See detailMaladaptive emotion regulation strategies and stress sensitivity mediate the relation between adverse life events and attenuated psychotic symptoms.
Laloyaux, Julien ULg; Dessart, Gregory; Van der Linden, Martial ULg et al

Poster (2015, May 21)

Introduction There is now solid evidence for a relation between Adverse Life Events (ALE) and psychotic symptoms in both patients with psychosis and in the general population. A recent study has shown ... [more ▼]

Introduction There is now solid evidence for a relation between Adverse Life Events (ALE) and psychotic symptoms in both patients with psychosis and in the general population. A recent study has shown that this relation may be partially mediated by stress sensitivity. However, other factors that may mediate this relation, such as emotion regulation strategies, have not yet been examined in the literature. Objective The aim of this study was to assess the mediation effect of both emotion regulation strategies and stress sensitivity in the relation between ALE and attenuated positive psychotic symptoms in the general population. Results Results demonstrated that the relation between ALE and attenuated positive psychotic symptoms (i.e. hallucinations and delusions) was mediated by maladaptive emotion regulations strategies. Discussion Although it is most likely that there are several possible trajectories leading to the formation of positive psychotic symptoms, the results of the present study suggest that one such trajectory may involve the maladaptive regulation of negative emotions alongside a certain vulnerability after experiencing highly distressing ALE. Hence, interventions aiming to enhance adaptive emotion regulation strategies and diminish the utilization of maladaptive strategies should be regarded as an integral part of psychological treatment schemes in the context of psychotic symptoms. Conclusion In summary, the present study demonstrated that the relation between ALE and attenuated positive psychotic symptoms is mediated by maladaptive emotion regulation strategies. [less ▲]

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See detailQuelles stratégies africaines face aux émergents?
Mputu Ingole, Jean-Claude ULg

Conference (2015, May 20)

Le rapprochement entre l’Afrique et les pays émergents pose toute une série des questions. Dans cet article, nous voulons nous interroger sur la position africaine face à ces nouveaux acteurs. Le ... [more ▼]

Le rapprochement entre l’Afrique et les pays émergents pose toute une série des questions. Dans cet article, nous voulons nous interroger sur la position africaine face à ces nouveaux acteurs. Le continent africain est-il un acteur conscient des enjeux en cours avec ces nouveaux « partenaires », pour reprendre les termes de l’Union Africaine, ou comme le suggère certains auteurs, elle serait entrain de subir une fois de plus la volonté des acteurs extérieurs ? Car si l’on constate que l’ensemble des pays émergents ont mis en place des nouvelles stratégies africaines, le contraire ne paraît pas évident. Ce papier se propose donc de voir s’il existe une ou plusieurs stratégies africaines vis-à-vis des émergents et si oui, de les analyser dans le contexte d’un monde en pleine mutation avec des nouveaux enjeux. Comment l’Union Africaine fait face aux nouvelles sollicitations des Etats émergents ? Compte-t-elle en tirer profit pour sa propre affirmation comme une actrice qui compte ou bien est-elle marginalisée par les Etats africains qui chacun, en ce qui le concerne, recherche ses propres intérêts. A-t-elle mis en place des nouveaux instruments pour gérer, selon ses intérêts cet accroissement de coopération avec les pays émergents. Quels rôles jouent les organisations régionales et/ou le NEPAD dans le développement de ces nouvelles coopérations ? Car au moment où la croissance africaine est l’une des plus fortes au monde et que le nombre de ses partenaires ne cesse d’augmenter, il est dès lors question de savoir comment l’Afrique se prépare à saisir ces nouvelles opportunités pour renforcer sa présence sur le monde avec ou sans les émergents. [less ▲]

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