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See detailAbelian symmetries in multi-Higgs-doublet models
Ivanov, Igor ULg; Keus, Venus ULg; Vdovin, Evgeny

in Journal of Mathematical Physics (2012)

N-Higgs-doublet models (NHDM) are a popular framework to construct electroweak symmetry breaking mechanisms beyond the Standard model. Usually, one builds an NHDM scalar sector which is invariant under a ... [more ▼]

N-Higgs-doublet models (NHDM) are a popular framework to construct electroweak symmetry breaking mechanisms beyond the Standard model. Usually, one builds an NHDM scalar sector which is invariant under a certain symmetry group. Although several such groups have been used, no general analysis of symmetries possible in the NHDM scalar sector exists. Here, we describe a strategy that identifies all abelian groups which are realizable as symmetry groups of the NHDM Higgs potential. We consider both the groups of Higgs-family transformations only and the groups which also contain generalized CP transformations. We illustrate this strategy with the examples of 3HDM and 4HDM and prove several statements for arbitrary N. [less ▲]

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See detailNext-Generation Sequencing for Rodent Barcoding: Species Identification from Fresh, Degraded and Environmental Samples
Galan, Maxime; Pagès, Marie ULg; Cosson, Jean-François

in PLoS ONE (2012), 7(11), 48374

Rodentia are one of the most diverse orders among mammals, with more than 2,000 species currently described. Species assignation based on morphological data alone can present enormous challenges. In this ... [more ▼]

Rodentia are one of the most diverse orders among mammals, with more than 2,000 species currently described. Species assignation based on morphological data alone can present enormous challenges. In this study, we compared the applicability of 100 bp mini-barcodes from cytochrome b and cytochrome c oxidase 1 genes to enable rodent species identification. Based on GenBank sequence datasets of 115 rodent species, a 136 bp fragment of cytochrome b combined with universal rodent primers was selected as the most discriminatory mini-barcode. The efficacy of this new molecular tool was assessed on 946 samples including rodent tissues, feces, museum samples and feces/pellets from predators known to ingest rodents. Utilizing next generation sequencing technologies able to sequence multiple DNAs, 1,140 amplicons were tagged, multiplexed and sequenced together in one single 454 GS-FLX run. Our method was initially validated on a reference sample set including 265 clearly identified rodent tissues, corresponding to 103 different species. Following validation, 85.6% of 555 rodent samples from Europe, Asia and Africa whose species identity was unknown were able to be identified using the BLASTN program and GenBank reference sequences. In addition, our method proved effective even on degraded rodent DNA samples: 91.8% and 75.9% of samples from feces and museum specimens respectively were correctly identified. Finally, we succeeded in determining the diet of 66.7% of the investigated carnivores from their feces and 81.8% of owls from their pellets. Non-rodent species were also identified suggesting that our method is sensitive enough to investigate complete predator diets. This study demonstrates how this molecular identification method combined with high throughput sequencing can open new realms of possibilities in achieving fast, accurate and inexpensive species identification. [less ▲]

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See detailApplication of an Advanced GTN Model
Fansi, Joseph; Habraken, Anne ULg; Balan, Tudor et al

Conference (2012)

The present contribution consists of implementing an advanced GTN damage model as a "User Material subroutine" in the Abaqus FE code. This damage model is based on specific nucleation and growth laws.This ... [more ▼]

The present contribution consists of implementing an advanced GTN damage model as a "User Material subroutine" in the Abaqus FE code. This damage model is based on specific nucleation and growth laws.This model is applied to the prediction of the damage evolution and the stress state in notched specimens made of dual phase steel. By comparing numerical predictions with experimental results based on high-resolution X-ray absorption tomography, the numericalapproach was improved and validated [less ▲]

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See detailFP6 PROHITECH project: Volume 3: Seismic Protection of historical buildings: experimental activity
Arangelovski, Toni; Altay Askar, Gülay; Aras, Fuat et al

Book published by Polimetrica (2012)

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See detailOccurrence of cardiovascular calcifications in normal, aging rats.
Roosens, B; Bala, G; Droogmans, S et al

in Experimental Gerontology (2012), 47(8), 614-9

BACKGROUND: Cardiovascular calcification is an independent predictor of morbidity and mortality and increases with age. Animal models are frequently used to investigate the underlying pathophysiology ... [more ▼]

BACKGROUND: Cardiovascular calcification is an independent predictor of morbidity and mortality and increases with age. Animal models are frequently used to investigate the underlying pathophysiology. Only scarce data regarding the effect of aging on calcifications in these animal models are available. The aim of this study is to investigate the occurrence of cardiovascular calcifications in normal, aging rats. METHODS: A mixed inbred/outbred population of 44 male Lewis/Wistar rats was studied. Group 1 of three-month-old rats, group 2 twelve-month-old, group 3 twenty-four-month-old and group 4 thirty-month-old rats. Calibrated integrated backscatter (cIB) values and blood parameters (creatinine, parathyroid hormone (PTH)) were measured, followed by ex-vivo micro-CT and histology as reference methods. RESULTS: Cardiovascular calcifications developed with age, as demonstrated by significantly increasing cIB values of the aortic valve and myocardium. This was confirmed by a significant increase in the calcified volume on ex-vivo micro-CT and in the histological calcium score. There was also a significantly higher level of creatinine and PTH with age. CONCLUSIONS: As in humans, cardiovascular calcifications progressively increase with age in the normal rat. Therefore the aging rat model could be used for studying calcifying cardiovascular disease. cIB might have a value in future studies for the early detection of subclinical calcifications in humans. [less ▲]

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See detailInvestigation of the glucose metabolisme of the chicken embryo by injection of insulin
Franssens, Lies; Koppenol, Astrid; Wang, Yufeng et al

Poster (2012)

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See detailLe théorème de Lagrange en mathématiques et en économie : une étude didactique du savoir enseigné
Henry, Valérie ULg; Xhonneux, Sebastian

in Actes du Colloque EMF 2012 (2012)

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See detailC Fibres - Mg Matrix Composites Produced by Squeeze Casting and Friction Stir Processing: Microstructure & Mechanical Behaviour
Mertens, Anne ULg; Simar, Aude; Delannay, Francis

in Materials Science Forum (2012), 706-709

Mg-Al-Zn alloys have been reinforced with carbon fibres using either the liquid state process of squeeze casting (SC), or friction stir processing (FSP), a solid state process developed more recently and ... [more ▼]

Mg-Al-Zn alloys have been reinforced with carbon fibres using either the liquid state process of squeeze casting (SC), or friction stir processing (FSP), a solid state process developed more recently and that appears as a promising alternative for the large-scale production of C-Mg composites. Both processes have shown their ability to produce sound composites with enhanced strength compared to the non-reinforced alloys. in SC composites, the unsized woven C fabric remains intact while in the FSP composites the sized C fabric is fragmented in short fibres, with an aspect ratio typically equal to 4, homogeneously distributed in the Mg alloy matrix. [less ▲]

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See detailLinear magnetoelectric effect by orbital magnetism
Scaramucci, A.; Bousquet, Eric ULg; Fechner, M. et al

in Physical Review Letters (2012), 109(19),

We use symmetry analysis and first-principles calculations to show that the linear magnetoelectric effect can originate from the response of orbital magnetic moments to the polar distortions induced by an ... [more ▼]

We use symmetry analysis and first-principles calculations to show that the linear magnetoelectric effect can originate from the response of orbital magnetic moments to the polar distortions induced by an applied electric field. Using LiFePO 4 as a model compound we show that spin-orbit coupling partially lifts the quenching of the 3d orbitals and causes small orbital magnetic moments (μ (L)≈0.3μ B) parallel to the spins of the Fe2 + ions. An applied electric field E modifies the size of these orbital magnetic moments inducing a net magnetization linear in E. © 2012 American Physical Society. [less ▲]

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See detailBioindicator of Genotoxicity: the Allium cepa test
Tedesco, S; Laughinghouse IV, Haywood ULg

in Srivastava, J.K. (Ed.) Environmental Contamination (2012)

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See detailLatin du Haut Moyen Age et annotation morphosyntaxique automatique : quelles perspectives ?
Longrée, Dominique ULg; Philippart de Foy, Caroline ULg; Poudat, Céline

in Biville, Frédérique; Lhommé, Marie-Karine; Vallat, Daniel (Eds.) Actes du IXe Colloque international sur le latin vulgaire et tardif (LVLT9), Lyon, 2-6 Septembre 2009 (2012)

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See detailInternationaal privaatrecht geannoteerd
Wautelet, Patrick ULg; Kruger, Thalia; Verhellen, Jinske et al

Book published by La Charte (2012)

This collection presents the most important statutory materials useful for the practice in Belgium of private international law. Each instrument (Belgian Acts, European Regulations and International ... [more ▼]

This collection presents the most important statutory materials useful for the practice in Belgium of private international law. Each instrument (Belgian Acts, European Regulations and International Conventions in force in Belgium) is reproduced together with comments highlighting the most important case law in relation to the provisions studied. [less ▲]

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See detailUne histoire politique d'Internet
Lejeune, Christophe ULg

in Olivier, Jacques (Ed.) Mémo, Magazine radiophonique dont l’ambition est d’expliquer le passé avec les yeux d’aujourd’hui pour que l’histoire aide à son tour à expliquer le présent (2012)

Christophe Lejeune présente son ouvrage intitulé "Démocratie 2.0. Une histoire politique d'Internet".

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See detailBrain activation pattern related to gait disturbances in Parkinson's disease.
Cremers, Julien ULg; D'Ostilio, Kevin ULg; Stamatakis, Julien et al

in Movement Disorders : Official Journal of the Movement Disorder Society (2012), 27(12), 1498-505

Gait disturbances represent a therapeutic challenge in Parkinson's disease (PD). To further investigate their underlying pathophysiological mechanisms, we compared brain activation related to mental ... [more ▼]

Gait disturbances represent a therapeutic challenge in Parkinson's disease (PD). To further investigate their underlying pathophysiological mechanisms, we compared brain activation related to mental imagery of gait between 15 PD patients and 15 age-matched controls using a block-design functional MRI experiment. On average, patients showed altered locomotion relatively to controls, as assessed with a standardized gait test that evaluated the severity of PD-related gait disturbances on a 25-m path. The experiment was conducted in the subjects as they rehearsed themselves walking on the same path with a gait pattern similar as that during locomotor evaluation. Imagined walking times were measured on a trial-by-trial basis as a control of behavioral performance. In both groups, mean imagined walking time was not significantly different from that measured during real gait on the path used for evaluation. The between-group comparison of the mental gait activation pattern with reference to mental imagery of standing showed hypoactivations within parieto-occipital regions, along with the left hippocampus, midline/lateral cerebellum, and presumed pedunculopontine nucleus/mesencephalic locomotor area, in patients. More specifically, the activation level of the right posterior parietal cortex located within the impaired gait-related cognitive network decreased proportionally with the severity of gait disturbances scored on the path used for gait evaluation and mental imagery. These novel findings suggest that the right posterior parietal cortex dysfunction is strongly related to the severity of gait disturbances in PD. This region may represent a target for the development of therapeutic interventions for PD-related gait disturbances. (c) 2012 Movement Disorder Society. [less ▲]

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See detailAn Unexpected Synthesis of Dihydrophenazines en Route to Benzimidazolium Salts
Borguet, Yannick ULg; Zaragoza, Guillermo; Demonceau, Albert ULg et al

in Advanced Synthesis & Catalysis (2012), 354(7), 1356--1362

The oxidation of various N,N′-diarylbenzene-1,2-diamines bearing bulky aromatic substituents with sodium periodate on wet silica gel afforded a series of five new dihydrophenazines instead of the expected ... [more ▼]

The oxidation of various N,N′-diarylbenzene-1,2-diamines bearing bulky aromatic substituents with sodium periodate on wet silica gel afforded a series of five new dihydrophenazines instead of the expected cyclohexadiene-1,2-diimines. The reaction most likely proceeds via a 1,6-electrocyclic path and provides a convenient access to an important class of nitrogen heterocycles. Subsequent treatment of the mesityl derivative with chloromethyl pivalate and silver triflate led to the corresponding benzimidazolium salt. [less ▲]

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See detailIntérieurs poétiques : quelle(s) réflexivité(s) ?
Hick, Anne-Laure ULg

in MethIS : Méthodes et Interdisciplinarité en Sciences Humaines (2012), 3

Cet article propose une analyse de la teneur réflexive des poèmes d’intérieur. Après une brève description de ces textes, nous en étudions quelques échantillons à partir desquels nous dégageons divers ... [more ▼]

Cet article propose une analyse de la teneur réflexive des poèmes d’intérieur. Après une brève description de ces textes, nous en étudions quelques échantillons à partir desquels nous dégageons divers types de réflexivité : premièrement, une réflexivité spéculaire ou mise en abîme, deuxièmement, une réflexivité psychique, troisièmement une réflexivité sociale, quatrièmement, une réflexivité « en gigogne » (Durand, 2008 : 206), et cinquièmement, une réflexivité critique. Chacune de ces réflexivités se voit définie et illustrée par l’analyse d’un cas concret. [less ▲]

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