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See detailLa flexicurité revisitée : analyse qualitative interdisciplinaire du discours de travailleurs à l'aide d'un logiciel collaboratif »
Beuker, Laura ULg; DE CIA, Julie ULg; Orianne, Jean-François ULg et al

Conference (2015, June 17)

La flexicurité constitue un oxymore qui prône la recherche d’un équilibre entre besoins de flexibilité et de sécurité sur le marché du travail. Cet équilibre est avant tout un objectif politique, mais il ... [more ▼]

La flexicurité constitue un oxymore qui prône la recherche d’un équilibre entre besoins de flexibilité et de sécurité sur le marché du travail. Cet équilibre est avant tout un objectif politique, mais il reste fragile aux yeux des acteurs concernés. En cherchant à croiser le regard analytique de trois disciplines – psychologie, gestion et sociologie –, nous avons recouru au logiciel Cassandre (Lejeune, 2008) pour dégager des tensions discursives autour des notions de flexibilité et de sécurité dans un corpus de vingt entretiens qualitatifs. L’article permet ainsi de concrétiser l’intérêt et les limites de l’utilisation d’un logiciel d’analyse qualitative dans le cadre d’un travail interdisciplinaire. [less ▲]

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See detailAdvanced characterisation to investigate the effect of raw material properties on the kinetics of iron ores granulation
Jaimes Contreras, Rafael Antonio; van Loo, Frédéric; Douce, Jean-François et al

Speech/Talk (2015)

The objective of this paper is to study the effect of raw material properties on the kinetics of iron ore granulation considering in particular the layering mechanisms in wet granulation for different ... [more ▼]

The objective of this paper is to study the effect of raw material properties on the kinetics of iron ore granulation considering in particular the layering mechanisms in wet granulation for different iron ore types. For that purpose, the granulation behaviour of single iron ore binary mixtures and more complex mixtures (iron ores and return fines) has been studied at laboratory scale using pilot drums. A particular interest is paid to the influence of morphology and wettability of iron ores. [less ▲]

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See detailUse of 16S rDNA Metagenetics and classical Microbiology to Assess the bacterial superficial Contamination Patterns in Bovines Classically Slaughtered or following the Halal Ritual
Korsak Koulagenko, Nicolas ULg; Taminiau, Bernard ULg; Hupperts, Caroline et al

Poster (2015, June 17)

In Belgium and in several European countries, two cattle slaughtering protocols exist: the classical method, that encompasses a stunning step before the sticking procedure, and the halal method, combining ... [more ▼]

In Belgium and in several European countries, two cattle slaughtering protocols exist: the classical method, that encompasses a stunning step before the sticking procedure, and the halal method, combining the stunning and the sticking in one single step. The main difference lies in the fact that, in the halal protocol, a single cut with a sharp knife is practiced directly on live cattle, instead of two cutting steps with two different knives for the sticking in the classical slaughtering technique. The unique section in the halal technique results generally in the cross section of trachea and esophagus of cattle. The aim of this study was to seek if the two slaughtering techniques were similar regarding the superficial contamination of carcasses, swabbed between 2 and 4 hours after the killing step. For this purpose, classical microbiological tests (TVC and Enterobacteriaceae) and 16S rDNA metagenetic analysis were carried out from 20 cattle carcasses (swabbing of “legal” zone – 1.600 cm2 – and in the neck area – 200 cm2). The classical microbiological results revealed no significant differences between the two slaughtering practices. Statistical analysis of pyrosequencing data showed that differences in bacterial population abundance between slaughtering methods were mainly found in the “legal” swabbing zone compared to the neck area. Bacterial genera belonging to Actinobacteria (Brevibacterium, Corynebacterium) were more aundant in “Halal” samples whereas populations from the Proteobacteria (Caulobacteraceae, Comamonadaceae, Bradyrhizobiaceae) and Firmicutes (Lactobacillus) were more abundand in the “classical” group. The analysis of OTU abundance of bacteria from the digestive or respiratory tract revealed no differences beteween groups. In conclusion, the slaughtering method does not influence the superficial microbiological pattern in terms of specific microbiological markers of the digestive or respiratory tract. However, precise analysis to the genus level underlines differences between methods, the legal swabbing zone being still the best sampling zone compared to the neckline. The next step will be the identification of precise contamination origin of the differences found between slaughtering methods. [less ▲]

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See detailMAVEN IUVS observations of the aftermath of the Comet Siding Spring meteor shower on Mars
Schneider, Nick; Deighan, Justin; Stewart, Ian et al

in Geophysical Research Letters (2015)

We report the detection of intense emission from magnesium and iron in Mars' atmosphere caused by a meteor shower following Comet Siding Spring's close encounter with Mars. The observations were made with ... [more ▼]

We report the detection of intense emission from magnesium and iron in Mars' atmosphere caused by a meteor shower following Comet Siding Spring's close encounter with Mars. The observations were made with the Imaging Ultraviolet Spectrograph, a remote sensing instrument on the Mars Atmosphere and Volatile EvolutioN spacecraft orbiting Mars. Ionized magnesium caused the brightest emission from the planet's atmosphere for many hours, resulting from resonant scattering of solar ultraviolet light. Modeling suggests a substantial fluence of low-density dust particles 1–100 µm in size, with the large amount and small size contrary to predictions. The event created a temporary planet-wide ionospheric layer below Mars' main dayside ionosphere. The dramatic meteor shower response at Mars is starkly different from the case at Earth, where a steady state metal layer is always observable but perturbations caused by even the strongest meteor showers are challenging to detect. [less ▲]

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See detailIn vitro model to study the biological properties of humic fractions from landfill leachate and leonardite during root elongation of Alnus glutinosa L. Gaertn and Betula pendula Roth.
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Thonart, Philippe ULg et al

in Plant Cell, Tissue & Organ Culture (2015), 122(3), 739-749

Humic substances (HS) are organic compounds resulting from the physical, chemical and microbiological transformations of organic residues. Our study aims to determine the main biological properties of HS ... [more ▼]

Humic substances (HS) are organic compounds resulting from the physical, chemical and microbiological transformations of organic residues. Our study aims to determine the main biological properties of HS comparing landfill leachate (LHS) source to a stable formulation extracted from leonardite (HHS), and using an in vitro system of root development from shoot and leaf explants of silver birch (Betula pendula Roth) and black alder (Alnus glutinosa L. Gaertn). Results showed that both explants of both species rooted closely to 100% when cultivated in absence of HS. The incorporation of HS or their fractions into the culture medium affect root growth, mainly lateral roots formation and primary root length. Applied at low concentration (10 ppm) HS stimulated especially primary root growth. But at high concentration (100 ppm), LHS inhibited root formation of alder, while birch was more tolerant. The application of 100 ppm of HHS, did not affect alder root growth but increased root growth in birch. Humic acids fractions (HA) were favorable and improved root growth while, fulvic acids (FA) and other molecules (OM) decreased significantly root growth, especially those extracted LHS. The root inhibition expressed at high LHS concentration may be due to the presence of different toxic molecules and root growth inhibitors in OM and FA fractions and that some of them remained in the OM fraction from leonardite. [less ▲]

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See detailEffect of γ-radiation on free radicals formation, structural changesand functional properties of wheat starch
Atrous, Hager; Benbettaieb, Nasreddine; Hosni, Faouzi et al

in International Journal of Biological Macromolecules (2015), 80

Wheat starch was treated by different γ-radiation doses (3, 5, 10, 20, 35 and 50 kGy). The effects of γ-radiation on structural, thermal, physicochemical, morphological and rheological properties of wheat ... [more ▼]

Wheat starch was treated by different γ-radiation doses (3, 5, 10, 20, 35 and 50 kGy). The effects of γ-radiation on structural, thermal, physicochemical, morphological and rheological properties of wheat starch were studied. The presence of free radicals after γ-radiation treatment, which number decreased with time was confirmed. Structural analysis revealed decreases in the intensities of the O–H and C–H stretches and glycosidic linkages indicating the depolymerization of amylose and probably amy-lopectin into shorter chain molecules, but showed that γ-radiation treatment did not affect the crystalline structure. Differential scanning calorimetric (DSC) thermograms showed the absence of significant differences in the gelatinization temperatures, as well as the corresponding transition enthalpies since the DSC parameters are related to the crystalline ordering within the granules. Apparent amylose content decreased linearly with increasing irradiation dose leading to an increase in water solubility index. Anincrease in the swelling power was observed after irradiation treatment until 20 kGy, followed by a rapiddecrease at higher doses. Microscopic observations showed that the effect of γ-radiation was more visible on starch pastes than on starch granules. Rheological properties of the starch pastes decreased within creasing irradiation dose as a result of glycosidic bond cleavage. [less ▲]

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See detailMicrobial diversity and function during different bioremediation strategies of diesel-polluted soil
Masy, Thibaut ULg; Hiligsmann, Serge ULg; Thonart, Philippe ULg et al

Poster (2015, June 16)

In numerous hydrocarbon-polluted sites, oxygen and pollutant bioavailability constitutes the main limiting factors for biodegradation because of the strong adsorption of hydrocarbons on organic soil ... [more ▼]

In numerous hydrocarbon-polluted sites, oxygen and pollutant bioavailability constitutes the main limiting factors for biodegradation because of the strong adsorption of hydrocarbons on organic soil particles (clay and peat). Therefore, several strategies such as biostimulation (with air/H2O2 and/or nutrients) or bioaugmentation are used, but often without understanding the endogenous microflora degrading capacity. This lack of differentiation between indigenous and added microorganisms could lead to poor predictability of the biodegradation efficiency. In addition, anaerobic degradation remains less applied in industrial settings for such compounds (especially for saturated hydrocarbons) as this process remains slow. In this context, the main objective of our study was to understand how the bacterial community evolves, in terms of species and degrading gene diversities, during the application of three different bioremediation strategies in a heavily diesel-polluted clay soil: (i) anaerobic natural attenuation, (ii) bioventing and (iii) bioaugmentation with Rhodococcus erythropolis T902.1. In addition to the supply of new degrading genes, bioaugmentation with this biosurfactant-producing strain should facilitate the bioassimilation of desorbed hydrocarbons by the whole degrading microflora. This hypothesis is strengthened by previous results obtained during several microcosm- and pilot-scale experiments. Aerobic and anaerobic microcosms were set up with three different soil samples coming from the same polluted site. Initially, their global organic content was identical but their hydrocarbon and peat concentrations were different, which led to differential oxygen consumption. Soils were sampled every 10 days to extract the DNA to measure changes in bacterial populations (with RISA analysis and 16S rRNA gene sequencing) and function (with qPCR and sequencing of degrading genes). Further analyses of the hydrocarbon content by GC-MS and of the genetic diversity by MiSeq metagenomic analysis provided detailed chemical and functional microbial data related to compound degradation and relative gene increases. Initial results showed significant differences in the microbial community structure. Moreover, Rhodococci seem to be maintained in the soil after inoculation. [less ▲]

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See detailCompétition partisane, changement climatique et écologie politique : convergences et conflits sur les thématiques politiques
Piet, Grégory ULg

in Flipo, Fabrice (Ed.) Les actes du Colloque "Penser l'écologie politique" (2015, June 16)

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See detailModélisation de la mortalité de larves d'Hylotrupes bajulus (L.) par traitement anoxique pour la conservation d'objets d'intérêt patrimonial
de Streel, Géraud; Henin, Jean-Mac; Mercier, Emmanuelle et al

Poster (2015, June 16)

Au cours des dernières décénnies, les preuves scientifiques concernant les dangers des insecticides utilisés pour éliminer les insectes présents dans les œuvres d’art des points de vue de la santé du ... [more ▼]

Au cours des dernières décénnies, les preuves scientifiques concernant les dangers des insecticides utilisés pour éliminer les insectes présents dans les œuvres d’art des points de vue de la santé du personnel et des visiteurs, des risques environnementaux et des risques pour les œuvres ont conduit le monde de la conservation patrimoniale à se tourner vers des techniques alternatives de désinsectisation. Le traitement par anoxie fait partie de ces techniques. Il s’agit de soumettre les insectes à une atmosphère à faible teneur en oxygène (généralement < 0.1%) pendant une certaine durée pour les éliminer sans causer de dégât à l’œuvre ni laisser de résidus toxiques. Cette technique souffre toutefois de deux inconvénients majeurs. Le premier concerne l’importante durée de traitement nécessaire et le second concerne la sensibilité des résultats à un grand nombre de paramètres environnementaux. Cette étude a pour but d’analyser l’impact des températures élevées comme moyen pour accélérer le traitement ainsi que d’établir des modèles de mortalité intégrant certain paramètres qui influencent l’efficacité du traitement en vue de faciliter la détermination de la durée de ce dernier. Cette étude est réalisée en collaboration avec l’Institut Royal du Patrimoine Artistique (IRPA), et a également pour but de leur fournir un protocole permettant d’assurer une efficacité de traitement proche de 100%. Il a été montré que, conformément à ce qui existe dans la littérature, la température, la durée de traitement et le poids initial des larves influencent significativement la probabilité de mortalité des larves soumises au traitement tandis que le fait que la larve se situe dans une boite de Pétri ou dans une planchette de bois ne joue pas de rôle significatif. Il est également mis en évidence que, si la déshydratation des insectes lors du traitement joue un rôle important sur la mortalité, ce n’est pas le seul mécanisme impliqué. Des recherches supplémentaires sont nécessaires à ce sujet. Des modèles ont également pu être établis et ils permettent de déterminer qu’à température ambiante et 50% d’humidité du flux de gaz, la durée de traitement nécessaire pour éliminer 99% des insectes est de 26 jours [less ▲]

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See detailConcept of robustness
Demonceau, Jean-François ULg

Conference (2015, June 16)

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See detailRobustimpact project - System design
Demonceau, Jean-François ULg

Conference (2015, June 16)

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See detailDenjoy-Carleman classes and lineability
Esser, Céline ULg

Conference (2015, June 16)

The Denjoy-Carleman classes are spaces of smooth functions which satisfy growth conditions on their derivatives defined through weight sequences. In this talk, given a Denjoy-Carleman class E of Beurling ... [more ▼]

The Denjoy-Carleman classes are spaces of smooth functions which satisfy growth conditions on their derivatives defined through weight sequences. In this talk, given a Denjoy-Carleman class E of Beurling type that strictly contains another non-quasianalytic class F of Roumieu type, we handle the question of knowing how large the set of functions in E that are nowhere in the class F is. In particular, we prove the dense-lineability of the set of functions of E which are nowhere in F. Consequences for the Gevrey classes are also given. We extend then these results to the case of classes of ultradifferentiable functions defined using weight functions. [less ▲]

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See detailA generalization of the Snu spaces: getting rid of dyadic scales
Kleyntssens, Thomas ULg; Nicolay, Samuel ULg

Conference (2015, June 16)

The Snu spaces have been introduced by S. Jaffard to develop a new multifractal formalism that allows to improve the study of irregular functions. This type of formalism is connected to Besov spaces. From ... [more ▼]

The Snu spaces have been introduced by S. Jaffard to develop a new multifractal formalism that allows to improve the study of irregular functions. This type of formalism is connected to Besov spaces. From a theoretical point of view, the Snu spaces gave birth to counterexamples in functional analysis. In this talk, I present the first results on a generalization of these spaces. I also present some links between these new spaces and the generalized Besov spaces defined with wavelet coefficients. [less ▲]

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See detailEVALUATION OF CONTINUOUS SUPRASCAPULAR NERVE BLOCKADE IN THE TREATMENT OF REFRACTORY ADHESIVE CAPSULITIS : A RETROSPECTIVE STUDY
MUTSERS, Pierre ULg; LECOQ, Jean-Pierre ULg; GOFFIN, Pierre ULg et al

in Abstract Book du Residence Meeting de la Société Belge d'Anesthésie (2015, June 15)

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See detailL'activité de la NADPH oxydase : une nouvelle cible pour la curcumine ?
Derochette, Sandrine ULg

Doctoral thesis (2015)

La NADPH oxydase (Nox2) des neutrophiles (PMNs) est une enzyme multi-protéique responsable de la production d'espèce activées de l'oxygène (ROS) pour la destruction des pathogènes. L'activation excessive ... [more ▼]

La NADPH oxydase (Nox2) des neutrophiles (PMNs) est une enzyme multi-protéique responsable de la production d'espèce activées de l'oxygène (ROS) pour la destruction des pathogènes. L'activation excessive des PMNs est souvent associée à des pathologies mortelles chez le cheval, faisant de l'activité de la Nox2 une cible thérapeutique privilégiée. Le premier but de ce travail, a été de développer une méthode appelée "cell-free system" (CSF) pour mesurer l'activité in vitro de la Nox2 équine. Un inconvénient de cette technique sont les interférences possibles entre les inhibiteurs et la sonde utilisée pour la mesure de l'activité. Sur base de notre CFS, nous avons créé l'EquiNox2, un nouvel outil pharmacologique, pour étudier les interactions entre des inhibiteurs et la Nox2 et leurs effets sur l'assemblage et l'activité de l'enzyme. Cette méthode consiste en la mesure in vitro de l'activité de la Nox2 fixée sur un support solide, ce qui permet d'éliminer les inhibiteurs avant la mesure de l'activité et réduit les interférences citées pour le CFS. Le CFS et l'EquiNox2 ont été validés avec le diphénylène iodonium et le Gp91ds-tat, deux inhibiteurs connus de la Nox2 humaine. Le deuxième but de ce travail, était l'étude du NDS27, un complexe de lysinate de curcumine avec l'hydroxypropyl-β-cyclodextrine (HPβCD) sur la réponse oxydante des PMNs. Le NDS27, n'est pas toxique et est capable d'entrer et d'interagir avec les membranes des PMNs et d'inhiber l'activité de la myéloperoxydase, la Nox2 et la PKCδ (un activateur de Nox2) impliquées dans la production de ROS. Nous avons montré en CFS et EquiNox2 que le NDS27 se fixe fortement à la Nox2 pour empêcher son assemblage et que l'HPβCD, l'excipient du NDS27, en plus de solubiliser et transporter la curcumine, augmente l'action de celle-ci sur les activités de la PKC et la Nox2. L'effet modulateur du NDS27 sur l'activation de la Nox2 ouvre des perspectives thérapeutiques pour traitement des pathologies accompagnées de réactions inflammatoires excessives. [less ▲]

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See detailLes biotechnologies de la reproduction des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmo, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

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See detailIs it possible for large herds to graze while keeping a high milk yield level? The experience of two Belgian dairy farms.
Lessire, Françoise ULg; Hornick, Jean-Luc ULg; Dufrasne, Isabelle ULg

in van den Pol-van Dasselaer, Agnes; Aarts, H.F.M; De Vliegher, Alex (Eds.) et al Grassland and forages in high output dairy farming systems (2015, June 15)

Grazing is more and more abandoned because of increasing size of herds and automation of herd management (e.g. automatic milking system – AMS). In this context, this study aims to evaluate milk production ... [more ▼]

Grazing is more and more abandoned because of increasing size of herds and automation of herd management (e.g. automatic milking system – AMS). In this context, this study aims to evaluate milk production and composition of 2 large Belgian dairy herds equipped with AMS during winter and summer. These herds were followed over 2 years. At grazing, 30% of the offered feed was grass. Milk production in both herds was similar in summer and winter (30.2 ± 7.14 vs 29.7 ± 7.8 ± in Herd 1 and 26.9 ± 0.8 vs 26.4 ± 0.8 in Herd 2) while their milk composition differed. In conclusion, it is possible for grazing to be preserved even in large herds without impacting noticeably on the herd performance. [less ▲]

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See detailLa projection turque dans les Balkans occidentaux: défi ou opportunité pour l'Union européenne?
Lika, Liridon ULg

Scientific conference (2015, June 15)

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See detailCommercial farming of Leiolepis guttata in Binh Thuan province, Vietnam: implications for conservation and management
Rochette, Anne-Julie; Tran, Tinh ULg; De Martynoff, Abigail et al

in Herpetological Conservation and Biology (2015), 10(1),

Since the first Indochinese war, natural populations of Leiolepis guttata have been hunted for their meat in southeastern Vietnam as a subsistence meal; nowadays, it has become a luxury delicacy ... [more ▼]

Since the first Indochinese war, natural populations of Leiolepis guttata have been hunted for their meat in southeastern Vietnam as a subsistence meal; nowadays, it has become a luxury delicacy. Commercial farms have become established since 2004 because of wild population declines and increasing demand for meat. We interviewed farmers and restaurateurs about the breeding and trade of the species to better understand the impact on wild populations. The results highlight the recent flourishing expansion of farming with rapidly increasing product prices and number of farms, as well as the ease and profitability of this activity. Wild population declines are widely acknowledged by authorities and local communities. Farms are being regarded as conservation pools to offset wild stock depletion, in addition to an important source of income. We discuss the risks associated with this trade development and we emphasize the conservation implications. Demand for lizards as founders for farms and for meat are likely to increase further, but risks exist that the development of new farms would saturate the market causing prices to ultimately fall. Habitat destruction and over-collecting severely reduce wild populations, but the high densities of farmed lizards raise serious genetic and sanitary issues. We suggest that further information should be collected to assess the sustainability of this trade. Priority should be given to the assessment of natural population densities and hunting effort. Biological patterns of this species are poorly documented and sound knowledge would enable better management of farms, and if this species is recognized as endangered could lead restrictions on harvesting of wild populations. [less ▲]

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