Publications ORBi OA
Bookmark and Share    
Full Text
Peer Reviewed
See detailOn the identification of paedomorphic and overwintering larval newts based on cloacal shape: review and guidelines
Denoël, Mathieu ULg

in Current Zoology (in press)

Paedomorphosis is an alternative process to metamorphosis in which adults retain larval traits at the adult stage. It is frequent in newts and salamanders, where larvae reach sexual maturity without ... [more ▼]

Paedomorphosis is an alternative process to metamorphosis in which adults retain larval traits at the adult stage. It is frequent in newts and salamanders, where larvae reach sexual maturity without losing their gills. However, in some populations, larvae overwinter in water, while remaining immature. These alternative ontogenetic processes are of particular interest in various research fields, but have different causes and consequences, as only paedomorphosis allows metamorphosis to be bypassed before maturity. It is thus relevant to efficiently identify paedomorphs versus overwintering larvae. In this context, the aim of this paper was threefold: firstly, to perform a meta-analysis of the identification procedures carried out in the literature; secondly, to determine the effectiveness of body size to make inferences about adulthood by surveying natural newt populations of Lissotriton helveticus and Ichthyosaura alpestris, and thirdly, to propose easy guidelines for an accurate distinction between large larvae and paedomorphs based on an external sexual trait, which is essential for reproduction — the cloaca. More than half of the studies in the literature do not mention the diagnostic criteria used for determining adulthood. The criteria mentioned were the presence of mature gonads (10%), eggs laid (4%), courtship behaviour (10%), and external morphological sexual traits (39%) including the cloaca (24%). Body-size thresholds should not be used as a proxy for paedomorphosis, because overwintering larvae can reach a larger size than paedomorphs within the same populations. In contrast, diagnosis based on cloacal external morphology is recommended, as it can be processed by the rapid visual assessment of all caught specimens, thus providing straightforward data at the individual level for both sexes. [less ▲]

Detailed reference viewed: 25 (4 ULg)
Full Text
Peer Reviewed
See detail1 Conjoint influence of mind-wandering and sleepiness on task performance
Stawarczyk, David ULg; D'Argembeau, Arnaud ULg

in Journal of Experimental Psychology. Human Perception & Performance (in press)

Recent research suggests that sleepiness and mind-wandering—the experience of thoughts that are both stimulus-independent and task-unrelated—frequently co-occur and are both associated with poorer ... [more ▼]

Recent research suggests that sleepiness and mind-wandering—the experience of thoughts that are both stimulus-independent and task-unrelated—frequently co-occur and are both associated with poorer cognitive functioning. Whether these two phenomena have distinguishable effects on task performance remains unknown, however. To investigate this question, we employed the online experience sampling of mind-wandering episodes and subjective sleepiness during a laboratory task (the Sustained Attention to Response Task; SART), and also assessed mind-wandering frequency and sleep-related disturbances in daily life using self-report questionnaires. The results revealed that the tendency to experience mind-wandering episodes during the SART and daily life was associated with higher levels of daytime sleepiness and sleep-related disturbances. Importantly, however, mind-wandering and sleepiness were independent predictors of SART performance at both the within- and between-individuals levels. These findings demonstrate that, although mind-wandering and sleepiness frequently co-occur, these two phenomena have distinguishable and additive effects on task performance. [less ▲]

Detailed reference viewed: 145 (3 ULg)
Full Text
Peer Reviewed
See detailCrop residue management in arable cropping systems under a temperate climate. Part 2: Soil physical properties and crop production. A review
Hiel, Marie-Pierre ULg; Chelin, Marie ULg; Parvin, Nargish ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment (in press)

Detailed reference viewed: 29 (11 ULg)
Full Text
Peer Reviewed
See detailThe Science, development, and commercialization of postharvest biocontrol products
Droby, Samir; Wisniewski, Michael; Teixido, Neus et al

in Postharvest Biology & Technology (in press)

Detailed reference viewed: 21 (2 ULg)
Full Text
Peer Reviewed
See detailTowards sustainable food systems: the concept of agroecology and how it questions current research practices. A review
Hatt, Séverin ULg; Artru, Sidonie ULg; Brédart, David ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment (in press), 20(Special issue 1),

Introduction. Multiple environmental and socio-economic indicators show that our current agriculture and the organization of the food system need to be revised. Agroecology has been proposed as a ... [more ▼]

Introduction. Multiple environmental and socio-economic indicators show that our current agriculture and the organization of the food system need to be revised. Agroecology has been proposed as a promising concept for achieving greater sustainability. This paper offers an overview and discussion of the concept based on existing literature and case studies, and explores the way it questions our current research approaches and education paradigms. Literature. In order to improve the sustainability of agriculture, the use of external and chemical inputs needs to be minimized. Agroecological farming practices seek to optimize ecological processes, thus minimizing the need for external inputs by providing an array of ecosystem services. Implementing such practices challenges the current structure of the food system, which has been criticized for its lack of social relevance and economic viability. An agroecological approach includes all stakeholders, from field to fork, in the discussion, design and development of future food systems. This inclusion of various disciplines and stakeholders raises issues about scientists and their research practices, as well as about the education of the next generation of scientists. Conclusions. Agroecology is based on the concept that agricultural practices and food systems cannot be dissociated because they belong to the same natural and socio-economic context. Clearly, agroecology is not a silver-bullet, but its principles can serve as avenues for rethinking the current approaches towards achieving greater sustainability. Adapting research approaches in line with indicators that promote inter- and transdisciplinary research is essential if progress is to be made. [less ▲]

Detailed reference viewed: 83 (16 ULg)
Full Text
Peer Reviewed
See detailLate Pleistocene molecular dating of past population fragmentation and demographic changes in African rain forest tree species supports the forest refuge hypothesis
Duminil, Jérôme; Mona, Stefano; Mardulyn, Patrick et al

in Journal of Biogeography (in press)

Aim : Phylogeographical signatures of past population fragmentation and demographic change have been reported in several African rain forest trees. These signatures have usually been interpreted in the ... [more ▼]

Aim : Phylogeographical signatures of past population fragmentation and demographic change have been reported in several African rain forest trees. These signatures have usually been interpreted in the light of the Pleistocene forest refuge hypothesis, although dating these events has remained impracticable because of inadequate genetic markers. We assess the timing of interspecific and intraspecific genetic differentiation and demographic changes within two rain forest Erythrophleum tree species (Fabaceae: Caesalpinioideae). Location : Tropical forests of Upper Guinea (West Africa) and Lower Guinea (Atlantic Central Africa). Methods : Six single-copy nuclear genes were used to characterize the phylogeographical patterns of the parapatric sister species Erythrophleum suaveolens (characteristic of semi-deciduous or gallery forests) and Erythrophleum ivorense (characteristic of evergreen forests). The number of gene pools within each species was determined and the timings of their divergence and past demographic changes were estimated using Bayesian-based coalescent approaches. Results : Three geographically separated gene pools were identified within E. suaveolens, and a single gene pool was inferred in E. ivorense. All gene pools show signatures of demographic bottlenecks concomitant with the last glacial period (c. 120–12 ka). Species-tree inferences show that the two species diverged c. 600 ka, whereas the divergence between E. suaveolens gene pools was dated to the late Pleistocene (first divergence c. 120 ka, second c. 60 ka). Main conclusions : (1) Molecular dating of demographic changes of two African tropical forest tree species is consistent with the Pleistocene forest refuge hypothesis. (2) Tree species from Guinean evergreen tropical forests might have been less affected by past climate change than semi-deciduous species. (3) Our phylogeographical data support a recent date (Holocene) of the last opening of the Dahomey Gap. [less ▲]

Detailed reference viewed: 29 (7 ULg)
Full Text
Peer Reviewed
See detailLa place de l'arbre dans les systèmes agricoles par les populations locales
Hick, Aurélie ULg; Hallin, Maud; Tshibungu, Alain et al

in Mahy, Grégory; Colinet, Gilles; Bogaert, Jan (Eds.) Anthropisation au Katanga (in press)

Dans un contexte de déforestation massive dans les zones rurales adjacentes aux grandes métropoles de la République Démocratique du Congo (RDC), zones d’approvisionnement en bois-énergie, l’identification ... [more ▼]

Dans un contexte de déforestation massive dans les zones rurales adjacentes aux grandes métropoles de la République Démocratique du Congo (RDC), zones d’approvisionnement en bois-énergie, l’identification de la place et du rôle que prend l’arbre dans les villages constituent un préalable à tous plan de restauration forestière. Ce chapitre porte sur les connaissances taxonomiques, les usages et la distribution des espèces arborées indigènes au sein de quatre villages en zone rurale adjacente à la ville de Lubumbashi, chef-lieu de la province du Katanga en RDC. Un total de 49 espèces indigènes de la forêt claire a été identifié par les 51 familles interrogées. Les utilisations sont classées en 6 catégories. Neuf espèces sont connues par plus de 50% des familles et correspondent aux espèces les plus utilisées pour l’alimentation via la consommation de leurs fruits et pour la confection d’outils. Les espèces citées par les personnes interrogées ne sont pas présentes dans le système agricole. La densité d’arbre à l’hectare au sein des champs est faible. Les espèces présentes sont des espèces résistantes aux facteurs de dégradation. Cette étude a montré que la connaissance taxonomique est limitée aux espèces les plus utilisées. Il n’y a pas de gestion intégrée de l’arbre au sein du système agricole dans la zone rurale adjacente à la ville de Lubumbashi. [less ▲]

Detailed reference viewed: 15 (3 ULg)
Full Text
Peer Reviewed
See detail« Observation relative au poème Un Coup de Dés jamais n’abolira le Hasard par Stéphane Mallarmé » : une préface d’un nouveau genre ?
Durand, Pascal ULg

in Luneau, Marie-Pier; Saint-Amand, Denis (Eds.) La Préface. Formes et enjeux d'un discours d'escorte (in press)

L’« Observation relative au poème UN COUP DE DÉS JAMAIS N’ABOLIRA LE HASARD », rédigée expressément à la demande de la rédaction de la revue Cosmopolis qui en avait procuré l’édition originale sous une ... [more ▼]

L’« Observation relative au poème UN COUP DE DÉS JAMAIS N’ABOLIRA LE HASARD », rédigée expressément à la demande de la rédaction de la revue Cosmopolis qui en avait procuré l’édition originale sous une première forme, est depuis lors, assez improprement, considérée et lue comme une « préface » au Coup de dés dans sa version définitive. Émanant d’un poète ayant marqué plus d’une fois la vive défiance que lui inspirait le geste de la préface, elle doit plutôt être lue, tout d’abord, comme un texte de circonstance imposé par des contingences éditoriales et comme un commentaire visant à assurer la lisibilité d’un texte monstre en le rabattant sur des codes reçus. Examinée sous l’angle de sa construction et de son dispositif d’énonciation, cette « Observation » tient sans doute moins, en outre, d’une préface apportée après coup à un « poème » que d’un manifeste esthétique faisant « observer » et se lever, à l’horizon du texte, l’émergence d’un genre poétique sans précédent. [less ▲]

Detailed reference viewed: 146 (52 ULg)
Full Text
Peer Reviewed
See detailOne decade of active avian influenza wild bird surveillance in Belgium showed a higher viroprevalence in hunter-harvested than live-ringed birds
Steensels, Mieke; Vangeluwe, Didier; Linden, Annick ULg et al

in Avian Diseases (in press)

Detailed reference viewed: 12 (1 ULg)
Full Text
Peer Reviewed
See detailBioclimatism in Architecture : an evolutionary perspective
Nguyen, Anh Tuan; Reiter, Sigrid ULg

in International Journal of Design and Nature and Ecodynamics (in press)

Fundamentals of vernacular architecture have been used in bioclimatic architecture which has gradually become the inspiration of various movements in contemporary architecture. The study points out that ... [more ▼]

Fundamentals of vernacular architecture have been used in bioclimatic architecture which has gradually become the inspiration of various movements in contemporary architecture. The study points out that the development of bioclimatism in architecture has followed the pattern of a natural evolutionary process in which “natural selection” is likely motivated by several factors, including resources and environment problems, and driven by different mechanisms including novel building design concepts and methods, new standards and codes, discoveries in building science and construction costs. This study is an effort aimed to clarify the evolution process of the bioclimatic approach in architecture over time and its influences on contemporary movements in architecture. The paper shows also that the evolutionary theory generated new scientific tools able to improve building design thanks to simulation-based optimization methods applied to building performances. Finally, this study investigates new motivations in the era of climate change whose effects are expected to introduce more challenges as well as more trends towards a sustainable built environment through the new concept of Eco-adaptive architecture. [less ▲]

Detailed reference viewed: 23 (2 ULg)
Full Text
See detailDesign and modelisation of a straylight facility for space optical instrument
Mazy, Emmanuel ULg; Stockman, Yvan ULg; Hellin, Marie-Laure ULg

in SPIE (Ed.) 2012 Optical system Design (in press)

In the framework of instrument calibration, straylight issues are a critical aspect that can deteriorate the optical performances of instrument. To cope with this, a new facility is designed dedicated for ... [more ▼]

In the framework of instrument calibration, straylight issues are a critical aspect that can deteriorate the optical performances of instrument. To cope with this, a new facility is designed dedicated for in-field and far field straylight characterization: up to 10-8 for in-field and up to 10-10 for far field straylight in the visible to NIR spectral ranges. Moreover, from previous straylight test performed at CSL, vacuum conditions are needed for reaching the 10-10 rejection requirement mainly to avoid air/dust diffusion. The major constrains are to design a straylight facility either for in-field and out-field straylight measurements. That requires high dynamic range at source level and a high radiance point source allowing small diverging collimated beam. Moreover, the straylight facility has to be implemented into a limited envelope and has to be built with vacuum compatible materials and black coating. As checking the facility performance requires an instrument better than the facility itself, that is no easy to find, so that the performances have been estimated through a modelisation into a non sequential optical software. This modelisation is based on CAD importation of mechanical design, on BRDF characteristics of black coating and on statistical averaging of ray tracing at instrument entrance. [less ▲]

Detailed reference viewed: 110 (30 ULg)
Full Text
Peer Reviewed
See detailMeningitis and orchitis in a hare (Lepus Europaeus) infected with Francisella tularensis
Grégoire, Fabien; Cassart, Dominique ULg; Desmecht, Daniel ULg et al

in Veterinary Records Case Reports (in press)

Detailed reference viewed: 13 (3 ULg)
Full Text
Peer Reviewed
See detailLinguistic variation in Ancient Egyptian. An introduction to the state of the art (with special attention to the community of Deir el-Medina)
Polis, Stéphane ULg

in Cromwell, Jennifer; Grossman, Eitan (Eds.) Beyond Free Variation: Scribal Repertoires from Old Kingdom to Early Islamic Egypt (in press)

In this chapter, I explore different aspects of the variability ‘inherent to human languages’ as it manifests itself in the corpus of pre-Demotic texts from Ancient Egypt. More specifically, I adopt a ... [more ▼]

In this chapter, I explore different aspects of the variability ‘inherent to human languages’ as it manifests itself in the corpus of pre-Demotic texts from Ancient Egypt. More specifically, I adopt a sociolinguistic perspective and describe the types of impact that extra-linguistic factors have had on the written performance in this specific socio-cultural setting. [less ▲]

Detailed reference viewed: 300 (18 ULg)
Full Text
Peer Reviewed
See detailRevealed preference tests of collectively rational consumption behavior: formulations and algorithms
Talla Nobibon, Fabrice; Cherchye, Laurens; Crama, Yves ULg et al

in Operations Research (in press)

This paper focuses on revealed preference tests of the collective model of household consumption. We start by showing that the decision problems corresponding to testing collective rationality are {\sc np ... [more ▼]

This paper focuses on revealed preference tests of the collective model of household consumption. We start by showing that the decision problems corresponding to testing collective rationality are {\sc np}-complete. This makes the application of these tests problematic for (increasingly available) large(r) scale data sets. We then present two approaches to overcome this negative result. First, we introduce exact algorithms based on mixed-integer programming ({\sc mip}) formulations of the collective rationality tests, which can be usefully applied to medium sized data sets. Next, we propose simulated annealing heuristics, which allow for efficient testing of the collective model in the case of large data sets. We illustrate our methods by a number of computational experiments based on Dutch labor supply data. [less ▲]

Detailed reference viewed: 92 (10 ULg)
Full Text
Peer Reviewed
See detailMinor compounds and oxidative stability of mono-varietal virgin olive oils produced in eastern of Morocco
Mansouri, Farid; Benmoumen, Abdessamad; Richard, Gaetan ULg et al

in Food Chemistry (in press)

The aim of this study is to characterize monovarietal virgin olive oils (VOOs) of new high-density plantings system of three cultivars (Arbequina, Arbosana and Koroneiki) which have been recently ... [more ▼]

The aim of this study is to characterize monovarietal virgin olive oils (VOOs) of new high-density plantings system of three cultivars (Arbequina, Arbosana and Koroneiki) which have been recently introduced in the eastern mediterranean region of Morocco. In this study, we have also conducted comparison between those monovarietal VOOs and olive oil of the local olive cultivar Picholine marocaine. Monovarietal VOOs characterization has been carried out by analysing several parameters, including quality index and olive oil stability to oxidation. Significant differences between the analysed olive oils were highlighted. They depend on cultivars and technological conditions of processing. We have noticed that Koroneiki olive oil have higher content of phenols (459.48 mg kg-1) and have the best value of oxidative stability (93.16 h). On the other hand Arbrosana’s VOO has low content of total phenols (260.85 mg kg-1) but it was distinguished by its higher content of alpha-tocopherol (460.07 mg kg-1). In addition, ten phenolic compounds present in virgin olive oils, were identified and quantitatively assessed by HPLC. Hydroxytyrosol, tyrosol, luteoline, pinoresinol and apigenin were the main phenolic compounds in those analyzed monovarietal VOOS. [less ▲]

Detailed reference viewed: 48 (11 ULg)
Full Text
Peer Reviewed
See detailInfluence of the secondary endosymbiont Serratia Symbiotica on the resistance to the parasitism in the aphid Acyrthosiphon pisum
Attia, Sabrine; Foray, Vincent; Louâpre, Philippe et al

in Journal of Entomology and Zoology Studies (in press)

Aphids have an obligate association with the primary symbiont Buchnera aphidicola and is known to affect aphid fitness. Aphids commonly harbour other facultative bacterial endosymbionts and may benefit ... [more ▼]

Aphids have an obligate association with the primary symbiont Buchnera aphidicola and is known to affect aphid fitness. Aphids commonly harbour other facultative bacterial endosymbionts and may benefit from their presence through increased resistance to parasitoids [1]. Present results suggest that the ability of hosts to defend against natural enemies depend not only on the presence of symbionts but also on the host genotype. Aphids represent a complex micro-environment for the parasitoid larvae and both the aphid physiology and endosymbiont influence their survival until mummification. [less ▲]

Detailed reference viewed: 86 (5 ULg)
Full Text
See detailL’apport du biofeedback dans le traitement des troubles de la voix
Remacle, Angélique ULg; Boughabi, Loubna; Morsomme, Dominique ULg

in Actes des XVIèmes Rencontres internationales d’orthophonie (in press)

It has recently become possible to monitor patients’ voices outside the speech therapist’s office with a portable, easy-to-use tool: the voice dosimeter. This tool measures voice frequency and sound ... [more ▼]

It has recently become possible to monitor patients’ voices outside the speech therapist’s office with a portable, easy-to-use tool: the voice dosimeter. This tool measures voice frequency and sound pressure level, as well as the duration of phonation, during a full day of regular activities. In addition to voice accumulation in an ecological context, the dosimeter used in this study (VoxLog, Sonvox) gives patients feedback on their voice use. In practice, the clinician configures the device so that it provides a vibratory signal in real time when the patient speaks above or below a predetermined frequency or sound pressure threshold. The feedback is intended to make patients aware of inappropriate vocal behavior and encourage them to change it. In this case study, we used biofeedback with the aim of reducing sound pressure level for a teacher suffering from vocal fold nodules. Our goal was to determine whether vibrotactile biofeedback applied in an ecological context for three consecutive weeks could reduce excess sound pressure. The feedback was activated every time the teacher spoke too loudly; its purpose was to help her avoid vocal abuse and (re)learn healthy vocal behaviors. This preliminary study generated encouraging results regarding the use of biofeedback in voice treatment. Nevertheless, it is important to investigate how this tool can best be implemented for patient management in speech language pathology. In addition, the method should be validated with randomized studies using a larger sample. [less ▲]

Detailed reference viewed: 20 (2 ULg)
Full Text
Peer Reviewed
See detailTreatment of Multiple Myeloma with high-risk cytogenetics: a consensus of the International Myeloma Working Group
Sonneveld, Pieter; Avet-Loiseau, Hervé; Lonial, Sagar et al

in Blood (in press)

Detailed reference viewed: 10 (2 ULg)
Full Text
Peer Reviewed
See detailPower System Dynamic Simulations using a Parallel Two-level Schur-complement Decomposition
Aristidou, Petros; Lebeau, Simon; Van Cutsem, Thierry ULg

in IEEE Transactions on Power Systems (in press)

As the need for faster power system dynamic simulations increases, it is essential to develop new algorithms that exploit parallel computing to accelerate those simulations. This paper proposes a parallel ... [more ▼]

As the need for faster power system dynamic simulations increases, it is essential to develop new algorithms that exploit parallel computing to accelerate those simulations. This paper proposes a parallel algorithm based on a two-level, Schur complement-based, domain decomposition method. The two-level partitioning provides high parallelization potential (coarse and fine-grained). In addition, due to the Schur-complement approach used to update the sub-domain interface variables, the algorithm exhibits high global convergence rate. Finally, it provides significant numerical and computational acceleration. The algorithm is implemented using the shared-memory parallel programming model, targeting inexpensive multi-core machines. Its performance is reported on a real system as well as on a large test system combining transmission and distribution networks. [less ▲]

Detailed reference viewed: 145 (9 ULg)