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See detailMyzus persicae feeding on water stressed Arabidopsis affects the emission profile of plant volatile organic compounds
Truong, Dieu-Hien; Delaplace, Pierre ULg; Brostaux, Yves ULg et al

in Journal of Environment and Ecology (2014), 5(2),

Emissions of volatile organic compounds (VOCs) by water-controlled or water-stressed Arabidopsis thaliana infested or not infested with Myzus persicae were evaluated by headspace solid phase ... [more ▼]

Emissions of volatile organic compounds (VOCs) by water-controlled or water-stressed Arabidopsis thaliana infested or not infested with Myzus persicae were evaluated by headspace solid phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). The infestations were maintained for 0–24 h, 24–48 h, and 48–72 h, and the emission profile for each time period was determined. Under these controlled conditions, the proportion of 4-methylpentyl isothiocyanate and dimethyl disulfide emitted by aphid-infested, water-stressed Arabidopsis was greater than that for aphid-infested water-controlled Arabidopsis over the 48–72 h sampling period. The proportion of terpene emitted by aphid-infested water-stressed plants also significantly increased compared with the other treatments over the three assayed sampling periods. In contrast, the proportion of 2-ethylhexanal (the only detected aldehyde) and ketones for the water-controlled plants generally remained high following aphid infestation. Taken together, these original data ascertain that abiotic factors can greatly interact to biotic stresses to alter the VOC emission profiles of plants. [less ▲]

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See detailCaractéristiques et performances de reproduction du Zebu. Le cas du Niger.
Moussa Garba, Mahamadou; Issa, M; Hanzen, Christian ULg

in Revue Africaine de Santé et de Productions Animales [=RASPA] (2014), 12(3-4), 135-141

This review presents an overview of the physiological and anatomical but also reproductive performance of African zebu characteristics. It is a first step to increase his milk and and meat potential by ... [more ▼]

This review presents an overview of the physiological and anatomical but also reproductive performance of African zebu characteristics. It is a first step to increase his milk and and meat potential by using more intensively artificial insemination (AI). The use of AI depends on the use of hormonal protocols to induce and synchronize oestrus. Actually, pregnancy rates obtained are between 31.4 and 46.6% respectively after use of PGF2a or progestagens. In Niger, the average pregnancy rates after artificial insemination is 29.9%. It is higher after in natural heat (43.4%) than induced heat (25.6%); It is also considerably lower after use of PGF2a (8.4%) than progestogens (23.4 to 39.5%). Improvement requires a better understanding of the effect of dietary factors, livestock or pathological responsible for fertility and fecundity. It is therefore important to continue and intensify field trials on more substantial numbers of animals. [less ▲]

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See detailCaractérisation de colluvions triasiques utilisés dans l'élaboration d'ustensiles rustiques de cuisson, cas de Talatast (Région de Marrakech, Maroc)
El Boudour El Idrissi, Hicham ULg; Daoudi, Lahcen; Collin, Frédéric ULg et al

in Verres, Céramiques & Composites (2014), 3(2), 18-22

The raw material used in the potter site of Talatast (Morocco) is collected from Triassic colluviums. Our study aims to characterize the mineralogical and geotechnical properties of the local clayey ... [more ▼]

The raw material used in the potter site of Talatast (Morocco) is collected from Triassic colluviums. Our study aims to characterize the mineralogical and geotechnical properties of the local clayey material before and after cooking. Our results confirm that the coarse particle size, the mineralogy of the clay fraction and the rate of fondants are suitable for the cookware material production. Defects encountered during the production are mainly related to the use of traditional ovens. Understanding the origin of the main defects could be helpful to promote the local pottery production. [less ▲]

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See detailLe délit de presse à l’ère numérique
Behrendt, Christian ULg

in Revue Belge de Droit Constitutionnel (2014), 2014

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See detailMinimal anomaly-free chiral fermion sets and gauge coupling unification
Ceboa, Luis; Emmanuel-Costa, David; González Felipe, Ricardo et al

in Physical Review. D, Particles, Fields, Gravitation, and Cosmology (2014)

We look for minimal chiral sets of fermions beyond the standard model that are anomaly free and, simultaneously, vectorlike particles with respect to color SU(3) and electromagnetic U(1). We then study ... [more ▼]

We look for minimal chiral sets of fermions beyond the standard model that are anomaly free and, simultaneously, vectorlike particles with respect to color SU(3) and electromagnetic U(1). We then study whether the addition of such particles to the standard model particle content allows for the unification of gauge couplings at a high energy scale, above 5.0 × 1015 GeV so as to be safely consistent with proton decay bounds. The possibility to have unification at the string scale is also considered. Inspired in grand unified theories, we also search for minimal chiral fermion sets that belong to SU(5) multiplets, restricted to representations up to imension 50. It is shown that, in various cases, it is possible to achieve gauge unification provided that some of the extra fermions decouple at relatively high intermediate scales. [less ▲]

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See detailCO Gas Inside the Protoplanetary Disk Cavity in HD 142527: Disk Structure from ALMA
Perez, S.; Casassus, S.; Ménard, F. et al

in Astrophysical Journal (2014), 798

Inner cavities and annular gaps in circumstellar disks are possible signposts of giant planet formation. The young star HD 142527 hosts a massive protoplanetary disk with a large cavity that extends up to ... [more ▼]

Inner cavities and annular gaps in circumstellar disks are possible signposts of giant planet formation. The young star HD 142527 hosts a massive protoplanetary disk with a large cavity that extends up to 140 AU from the central star, as seen in continuum images at infrared and millimeter wavelengths. Estimates of the survival of gas inside disk cavities are needed to discriminate between clearing scenarios. We present a spatially and spectrally resolved carbon monoxide isotopologue 2-1 line of $^12$CO, $^13$CO, and C[SUP]18[/SUP]$O obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). We detect emission coming from inside the dust-depleted cavity in all three isotopologues. Based on our analysis of the gas in the dust cavity, the $^12$CO emission is optically thick, while $^13$CO and C[SUP]18[/SUP]$O emissions are both optically thin. The total mass of residual gas inside the cavity is \~1.5-2 M $_Jup$. We model the gas with an axisymmetric disk model. Our best-fit model shows that the cavity radius is much smaller in CO than it is in millimeter continuum and scattered light observations, with a gas cavity that does not extend beyond 105 AU (at 3$\sigma$). The gap wall at its outer edge is diffuse and smooth in the gas distribution, while in dust continuum it is manifestly sharper. The inclination angle, as estimated from the high velocity channel maps is 28 \plusmn 0.5 deg, higher than in previous estimates, assuming a fix central star mass of 2.2 M $_&sun;$. [less ▲]

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See detailThe seed dispersal of the afro- tropical tree species Staudtia kamerunensis (Myristicaceae)
Hambuckers, Alain ULg

Scientific conference (2014, December 27)

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See detailBacterial Community Composition in Three Freshwater Reservoirs of Different Alkalinity and Trophic Status
Llirós, Marc; Inceoğlu, Özgul; García-Armisen, Tamara et al

in PLoS ONE (2014)

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See detailHydrophobin Fusion of an Influenza Virus Hemagglutinin Allows High Transient Expression in Nicotiana benthamiana, Easy Purification and Immune Response with Neutralizing Activity
Jacquet, Nicolas; Navarre, Catherine; Desmecht, Daniel ULg et al

in PLoS ONE (2014), 9(12), 115944

The expression of recombinant hemagglutinin in plants is a promising alternative to the current egg-based production system for the influenza vaccines. Protein-stabilizing fusion partners have been ... [more ▼]

The expression of recombinant hemagglutinin in plants is a promising alternative to the current egg-based production system for the influenza vaccines. Protein-stabilizing fusion partners have been developed to overcome the low production yields and the high downstream process costs associated with the plant expression system. In this context, we tested the fusion of hydrophobin I to the hemagglutinin ectodomain of the influenza A (H1N1)pdm09 virus controlled by the hybrid En2PMA4 transcriptional promoter to rapidly produce high levels of recombinant antigen by transient expression in agro-infiltrated Nicotiana benthamiana leaves. The fusion increased the expression level by a factor of ∼2.5 compared to the unfused protein allowing a high accumulation level of 8.6% of the total soluble proteins. Hemagglutinin was located in ER-derived protein bodies and was successfully purified by combining an aqueous-two phase partition system and a salting out step. Hydrophobin interactions allowed the formation of high molecular weight hemagglutinin structures, while unfused proteins were produced as monomers. Purified protein was shown to be biologically active and to induce neutralizing antibodies after mice immunization. Hydrophobin fusion to influenza hemagglutinin might therefore be a promising approach for rapid, easy, and low cost production of seasonal or pandemic influenza vaccines in plants. [less ▲]

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See detailNavigating the uncertain seas of controversies – A pedagogical wind rose
Verpoorten, Dominique ULg

in Melard, François; Stassart, Pierre M (Eds.) Proceedings of the International Interdisciplinary Working Conference "Teaching complexity and uncertainty on Environmental Issues - Practices, Theories and Products" (2014, December 23)

The Arlon conference brought together lecturers willing to share and discuss aspects of their practice of “controversies”, seen as a teaching/learning method suited to the contextual needs and demands of ... [more ▼]

The Arlon conference brought together lecturers willing to share and discuss aspects of their practice of “controversies”, seen as a teaching/learning method suited to the contextual needs and demands of higher education environmental studies. The paper contributes to this joint reflective effort by providing conceptual tools helping to interpret the practice, to question what it puts at stake and to detect, from a pedagogical viewpoint, key issues and upcoming questions. The contribution falls within the Conference's aim n°2: “share theories or conceptual propositions that make it possible to equip the teaching approaches and to give them theoretical and methodological foundations” (Program Arlon Conference 2014, p. 2). The article takes a traditional stance, looking at the contributions to the conference through “constructive alignment”(Biggs, 1996), a basic principle meant to secure the pedagogical validity of any given learning situation by establishing a triple consistency (Kovertaite & Leclercq, 2006; Leclercq, 1995; Petit, Castaigne, & Verpoorten, 2007; Tyler, 1949) between objectives, methods and assessment. [less ▲]

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See detailEarly history of extended irreversible thermodynamics (1953-1983): an exploration beyond local equilibrium and classical transport theory
Lebon, Georgy ULg; Jou, david

in European Physical Journal H. Historical Perspectives on Contemporary Physics (2014), 5(23),

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See detailTowards generic image classification: an extensive empirical study
Marée, Raphaël ULg; Geurts, Pierre ULg; Wehenkel, Louis ULg

E-print/Working paper (2014)

This paper considers the general problem of image classification without using any prior knowledge about image classes. We study variants of a method based on supervised learning whose common steps are ... [more ▼]

This paper considers the general problem of image classification without using any prior knowledge about image classes. We study variants of a method based on supervised learning whose common steps are the extraction of random subwindows described by raw pixel intensity values and the use of ensemble of extremely randomized trees to directly classify images or to learn image features. The influence of method parameters and variants is thoroughly evaluated so as to provide baselines and guidelines for future studies. Detailed results are provided on 80 publicly available datasets that depict very diverse types of images (more than 3800 image classes and over 1.5 million images). [less ▲]

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See detailDetection of response to command using voluntary control of breathing in disorders of consciousness
Charland-Verville, Vanessa ULg; Lesenfants, Damien; Sela, Lee et al

in Frontiers in Human Neuroscience (2014), 8(1020),

BACKGROUND: Detecting signs of consciousness in patients in a vegetative state/unresponsive wakefulness syndrome (UWS/VS) or minimally conscious state (MCS) is known to be very challenging. Plotkin et al ... [more ▼]

BACKGROUND: Detecting signs of consciousness in patients in a vegetative state/unresponsive wakefulness syndrome (UWS/VS) or minimally conscious state (MCS) is known to be very challenging. Plotkin et al. (2010) recently showed the possibility of using a breathing-controlled communication device in patients with locked in syndrome. We here aim to test a breathing-based "sniff controller" that could be used as an alternative diagnostic tool to evaluate response to command in severely brain damaged patients with chronic disorders of consciousness (DOC). METHODS: Twenty-five DOC patients were included. Patients' resting breathing-amplitude was measured during a 5 min resting condition. Next, they were instructed to end the presentation of a music sequence by sniffing vigorously. An automated detection of changes in breathing amplitude (i.e., >1.5 SD of resting) ended the music and hence provided positive feedback to the patient. RESULTS: None of the 11 UWS/VS patients showed a sniff-based response to command. One out of 14 patients with MCS was able to willfully modulate his breathing pattern to answer the command on 16/19 trials (accuracy 84%). Interestingly, this patient failed to show any other motor response to command. DISCUSSION: We here illustrate the possible interest of using breathing-dependent response to command in the detection of residual cognition in patients with DOC after severe brain injury. [less ▲]

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See detailETAT DE LIEU DE LA FILIERE APICOLE EN REPUBLIQUE DEMOCRATIQUE DU CONGO ET EVALUATION DES CAPACITES POLLINISATRICES DES ABEILLES DOMESTIQUES (Apis mellifera adansonii, L.) SUR LA CULTURE DE MELON AFRICAIN (Cucumeropsis mannii Naudin) A KISANGANI.
Posho Ndola, Boniface ULg

Doctoral thesis (2014)

La présente étude s’inscrit dans le cadre de la recherche d’une meilleure compréhension de la filière apicole en RDC, de l’influence de l’environnement sur la qualité de pains d'abeille et de miel pour la ... [more ▼]

La présente étude s’inscrit dans le cadre de la recherche d’une meilleure compréhension de la filière apicole en RDC, de l’influence de l’environnement sur la qualité de pains d'abeille et de miel pour la survie d’Apis mellifera adansonii, L. 1758 en RDC et de l’impact de la pollinisation des abeilles introduites (A. mellifera adansonii, L. 1758) sur la production de Cucumeropsis mannii (Naudin) à Kisangani. Trois approches ont été adoptées pour faire l’état de lieu de la filière apicole en RDC, dont (1) la distribution des questionnaires structurés aux apiculteurs, (2) des visites de ruchers et (3) des recherches documentaires. Dans le cadre de l’évaluation de la qualité de miels et pains d’abeilles, les échantillons de miels et de pollens ont été collectés dans trois sites écologiquement différents de la RDC. Les échantillons de miels ont été évalués suivant les critères et les protocoles établis par Codex Alimentarius; tandis que les pollens ont été évalués suivant les critères de teneur en protéines et en acides aminés essentiels. Les teneurs en protéines et en acides aminés essentiels de pains d’abeilles collectés ont été déterminées respectivement par la méthode Kjeldahl et par les hydrolyses acides et basiques. Les essais comparatifs de la pollinisation des abeilles domestiques ont été également conduits dans deux sites expérimentaux à Kisangani. Sur chaque site, deux champs d'un hectare séparés de 3 kilomètres ont été installés. Deux colonies d'abeilles ont été installées au milieu du champ expérimental de chaque site pendant la floraison (quand 10 % des plantes ont fleuri). Le second champ expérimental, sans colonies d’abeilles, a été considéré comme témoin. Les résultats obtenus après l’étude exploratoire sur l’apiculture en RDC montrent que l’apiculture congolaise reste encore semi traditionnelle; 54 % des apiculteurs congolais travaillent en coopérative; 100 % du cheptel apicole congolais est constitué d’A. mellifera adansonii, L. ; 96 % des apiculteurs utilisent les ruches Kenyanes; le nombre de ruches utilisé par un apiculteur congolais varie entre 2 et 120; la production d’une colonie par récolte oscille entre 1 et 25 litres de miel; la production annuelle par apiculteur est évaluée entre 10 et 900 litres de miel, le nombre de récoltes de miel effectué par an varie de 1 à 2. Cette étude a révélé que la teneur moyenne en protéines de pollens recueillies en RDC était 14,11 ± 5,27 %. Cette teneur en protéines était faible comparativement aux besoins alimentaires des abeilles en Europe. Tous les échantillons de pollen étaient constitués de dix acides aminés essentiels et leurs concentrations étaient dans la fourchette optimale des exigences alimentaires des abeilles en Europe. Les analyses des échantillons de miels ont révélé que la teneur en sucres réducteurs des échantillons de miel recueillies variait de 63,40 à 73,80 %, la teneur en saccharose était comprise entre 0,30 et 1,90 %, la teneur en eau oscillait entre 16,80 et 22,00 %, le pH des échantillons de miel analysés variait de 4,22 à 4,53, la moyenne de la conductivité électrique de miels récoltés a été ( 47,74 ± 13,93 ) S/cm et la concentration de HMF varié de 1,75 à 31,38 mg / kg de HMF miel. Les miels et les pollens collectés dans la forêt tropicale de Kisangani étaient moyennement plus nutritifs pour les abeilles que ceux de la savane de Kavwaya. Après les observations des essais comparatifs de pollinisation, il a révélé que la pollinisation des abeilles introduites a amélioré significativement le nombre de graines par fruit de 83,78 %, tandis que le nombre de fruits par plante et le poids de graines par fruit ont été améliorés respectivement de 422,89 % et 185,61 % par rapport au témoin. La taille de graine a été positivement influencée par la présence de colonie d’abeille dans le champ de C. mannii (Naudin). Dans cette étude, la distance par rapport aux ruches et l’orientation de vol des ouvrières n'ont pas influencé significativement le rendement et la taille des graines de C. mannii (Naudin) [less ▲]

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See detailRapid dynamic activation of a marine-based Arctic ice cap
McMillan, M; Shepherd, A; Gourmelen, N et al

in Geophysical Research Letters (2014), 41(24), 89028909

We use satellite observations to document rapid acceleration and ice loss from a formerly slow-flowing, marine-based sector of Austfonna, the largest ice cap in the Eurasian Arctic. During the past two ... [more ▼]

We use satellite observations to document rapid acceleration and ice loss from a formerly slow-flowing, marine-based sector of Austfonna, the largest ice cap in the Eurasian Arctic. During the past two decades, the sector ice discharge has increased 45-fold, the velocity regime has switched from predominantly slow (~ 101 m/yr) to fast (~ 103 m/yr) flow, and rates of ice thinning have exceeded 25 m/yr. At the time of widespread dynamic activation, parts of the terminus may have been near floatation. Subsequently, the imbalance has propagated 50 km inland to within 8 km of the ice cap summit. Our observations demonstrate the ability of slow-flowing ice to mobilize and quickly transmit the dynamic imbalance inland; a process that we show has initiated rapid ice loss to the ocean and redistribution of ice mass to locations more susceptible to melt, yet which remains poorly understood. [less ▲]

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See detailToward a Consistent Application of International Financial Reporting Standards (IFRSs) across Companies and Countries
Yammine, Mira ULg

Doctoral thesis (2014)

International Financial Reporting Standards (IFRSs) were developed to be a single set of high-quality globally accepted accounting standards. They are meant to allow uniformity in financial reporting ... [more ▼]

International Financial Reporting Standards (IFRSs) were developed to be a single set of high-quality globally accepted accounting standards. They are meant to allow uniformity in financial reporting, enhance comparability of financial statements in the midst of economical globalization, and allow companies with international subsidiaries to prepare their financial statements using similar global standards. The objective of the dissertation is to study whether the application of IFRSs is consistent across companies and countries; in particular we tackle the following two questions: -Does the application of IFRSs in the preparation of financial statements lead to consistency? -Does the public enforcement of accounting standards impact the consistent application of IFRSs? To answer the first question we have addressed standard IAS 36 that was developed by the International Accounting Standards Board (IASB) and covering impairment of assets. We found that managers’ opportunism still has an impact on the impairment of assets recognition and magnitude when taking impairment decisions. To address the second question, a survey covering enforcement of accounting standards activities was prepared and sent to public enforcement bodies in a number of countries mandating the adoption of IFRSs. The survey allowed us to construct an index that represents the activities of the public enforcement bodies. We studied the impact of public enforcement on specific applications of the standards, the results show a decrease in earnings management in countries with effective public enforcement. [less ▲]

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See detailUn concetto dal presente difficile: "diasistema" fra linguistica e filologia (romanze)
Morato, Nicola ULg

Scientific conference (2014, December 22)

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See detailUn guide de la rédaction du mémoire : pourquoi et comment ?
Grandjean, Geoffrey ULg

Scientific conference (2014, December 19)

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See detailThe Politics of National Accounting: Assessing Walloon Public Debt
Piron, Damien ULg

Conference (2014, December 19)

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