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See detailProtection of Antarctic microbial communities–‘out of sight, out of mind’
Hughes, Kevin; Cowan, Don; Wilmotte, Annick ULg

in Frontiers in Microbiology (2015), 6(151), 1-6

RecentadvancesinmolecularbiologytechniqueshaveshownthepresenceofdiversemicrobialcommunitiesandendemicspeciesinAntarctica.Endemicmicrobesmaybeapotentialsourceofnovelbiotechnologicallyimportantcompounds ... [more ▼]

RecentadvancesinmolecularbiologytechniqueshaveshownthepresenceofdiversemicrobialcommunitiesandendemicspeciesinAntarctica.Endemicmicrobesmaybeapotentialsourceofnovelbiotechnologicallyimportantcompounds,including,forexample,newantibiotics.Thus,thescientificandbiotechnologicalvalueofAntarcticterrestrialmicrobialhabitatscanbecompromisedbyhumanvisitationtoagreaterextentthanpreviouslyrealized.Theever-increasinghumanfootprintinAntarcticamakesconsiderationofthistopicmorepressing,asthenumberoflocationsknowntobepristinehabitats,whereincreasinglysophisticatedcutting-edgeresearchtechniquesmaybeusedtotheirfullpotential,declines.ExaminationoftheProtectedAreassystemoftheAntarcticTreatyshowsthatmicrobialhabitatsaregenerallypoorlyprotected.NoothercontinentonEarthisdominatedtothesamedegreebymicrobialspecies,andrealopportunitiesexisttodevelopnewwaysofconceptualizingandimplementingconservationofmicrobialbiogeographyonacontinentalscale.Herewehighlightpotentialthreatsbothtotheconservationofterrestrialmicrobialecosystems,andtofuturescientificresearchrequiringtheirstudy. [less ▲]

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See detail10. Perspectives - 1. La Lutte contre les pucerons grâce aux odeurs: développement d'une formulation phéromonale
Fassotte, Bérénice ULg; Vandereycken, Axel ULg; Chevalier Mendes Lopes, Thomas ULg et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2015, February 25)

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See detailImpact de la dynamique foncière dans la lutte contre l’insécurité foncière et la pauvreté des femmes dans la région de Tahoua au Niger
Moussa dit Kalamou, Mahamadou ULg

Doctoral thesis (2015)

In Niger Republic land issue is a concern to all parties acting in the rural area. The drought cycles of the last decades and the rapid increase of the population that doubles every ten years are ... [more ▼]

In Niger Republic land issue is a concern to all parties acting in the rural area. The drought cycles of the last decades and the rapid increase of the population that doubles every ten years are determinant factors of degradation of the agricultural land of culture with as consequence the land and food insecurity of the households in particular in the region of Tahoua. Despite efforts by the government and its partners through the village land management programs and natural regeneration, land access difficulties persist particularly for women households. The objective being to assess and analyze the impact of land dynamics induced by the recovery of land in order to find some solutions to the problems of land insecurity and access and control of natural resources by households, a survey was conducted in two phases. The first in 2010 for a sample of 420 households in twenty villages selected through a stratified sampling. The second in 2012 for a sample of 84 households with 42 female heads of household from the first sample being associated with a group of 42 male heads of households for a specific gender analysis. It appears from this study that men households have an average land area about twice as large as that of female households .It was also found that the land is usually concentrated in the hands of older householders over 60 years. It is noticed that the inheritance is also one of the most dominant modes of access to land. The fragmentation and the expansion of croplands favor the emergence of fields beyond the northern boundary of crops dedicated to breeding. Finally, the last three years, agricultural production has generally fallen. The results of the analysis also show that unlike men, women household heads have less inputs, on the one hand, and little income, on the other hand. These female households derive their main income from the sale of animal products. This proves that women are the poorest households with limited access to natural resources. To fight against tenure insecurity and poverty of households recommendations and perspectives have been identified for the establishment of good governance of land resources, intensification of anti-erosion works by households with substantial resources and initiation of other additional research for sustainable development of the region. [less ▲]

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See detailThe AgMIP Soil and Crop Rotation Initiative
Basso, Bruno; Dumont, Benjamin ULg; Shcherbak, Iurii et al

Conference (2015, February 25)

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See detailPoly(vinyl ester 1,2,3-triazolium)s: a new member of the poly(ionic liquid)s family
Obadia, M. M.; Colliat-Dangus, G.; Debuigne, Antoine ULg et al

in Chemical Communications (2015), 51(16), 3332-3335

A vinyl ester monomer carrying a pendant 1,2,3-triazole group is synthesized in two steps and polymerized by cobalt-mediated radical polymerization. Subsequent alkylation with N-methyl bis ... [more ▼]

A vinyl ester monomer carrying a pendant 1,2,3-triazole group is synthesized in two steps and polymerized by cobalt-mediated radical polymerization. Subsequent alkylation with N-methyl bis[(trifluoromethyl)sulfonyl]imide affords the corresponding poly(vinyl ester 1,2,3-triazolium). This unprecedented example of poly(vinyl ester ionic liquid) exhibits an ionic conductivity of 9.2 × 10(-7) S cm(-1) at 30 °C [less ▲]

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See detailQuantifying landscape anthropisation patterns: concepts, methods and limits
Vranken, Isabelle ULg

Doctoral thesis (2015)

Since human beings began to use and shape the land, their influence on their environment has kept on growing so that little or no ecosystem in the world is now considered as untouched. This induces ... [more ▼]

Since human beings began to use and shape the land, their influence on their environment has kept on growing so that little or no ecosystem in the world is now considered as untouched. This induces pressures on ecosystem health and land scarcity. Africa is of particular concern because it still presents broad undisturbed zones and key ecosystem services, despite being submitted to increasing anthropogenic pressures. Landscape ecology appears suitable for the study of such phenomena, thanks to its spacebased integrative nature and geographical level of focus. It studies the impact of spatial pattern transformation — especially heterogeneity and its components — on ecological processes and provides powerful analytical tools of landscape anthropisation. The main objective of this thesis is to organise the concepts and methods, from landscape ecology and related disciplines, into a consistent logic, to pinpoint missing analytical frameworks for response-oriented anthropisation assessment, and to apply them to African cases to explore the spatial patterns of anthropisation. In order to address landscape anthropisation, we assemble diverse disciplines into a logical network (DPSIR). The new theoretical framework is tested on Lubumbashi (DRC). In order to address spatial patterns, we first evaluate the thermodynamic connection of the term entropy in landscape ecology: spatial heterogeneity, unpredictability and scale influence. Then, based on 20 landscapes, we highlight the complex relationship between spatial heterogeneity and landscape anthropisation. We finally use the modelled relationships to test the anthropogenic origin of the spatial pattern of a land cover class in Lubumbashi. The main results of this research show that several concepts are used to describe different aspects of anthropisation and that its quantification strongly depends on the reference states. Data formats can be combined into a new assessment method ensuring more precision and comparability, but a good field knowledge is required. As for heterogeneity, the existing definitions of landscape entropy follow the logic of thermodynamics or information theory, that are not compatible. Only unpredictability could be properly interpreted in thermodynamic terms if energy transfer measurements were performed at the appropriate level. The anthropogenic effects on heterogeneity completely diverge depending on the amount of already anthropised surface, on the land cover type (natural or anthropogenic), and on the heterogeneity components. The aforementioned findings could be adapted to include functional aspects and better address the relationship between spatial pattern and ecological processes. Such integration would help designing response actions that can recommend human activities and spatial patterns that could optimise the use of land to ensure ecological functioning while supporting human development. [less ▲]

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See detailLe logiciel PegOpera : un outil pour la gestion intégrée des eaux de surface
Grard, Aline ULg; Everbecq, Etienne ULg; Graindorge, Caroline ULg et al

Poster (2015, February 24)

Le logiciel PegOpera inclut le modèle Pegase (Planification Et Gestion de l’ASsainissement des Eaux) et une interface graphique conviviale. PegOpera est un outil personnalisé utilisé par les gestionnaires ... [more ▼]

Le logiciel PegOpera inclut le modèle Pegase (Planification Et Gestion de l’ASsainissement des Eaux) et une interface graphique conviviale. PegOpera est un outil personnalisé utilisé par les gestionnaires de l’eau et opérationnel dans les champs d’applications de la Gestion Intégrée des Ressources en Eau (assainissement, DCE, NQE, …). L'ANPE s'est doté de cet outil d'aide à la décision afin de mieux remplir ses missions de gestion de la qualité des eaux de surface du bassin versant de la Medjerda. [less ▲]

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See detailContribution à l’étude de la dynamique de l’élevage pastoral au Niger : cas de la région de Diffa
Laouali, Abdoulkadri ULg

Doctoral thesis (2015)

In the Sahelian countries where extensive pastoral breeding is practiced, livestock plays an essential role in the socio-economic and dietary balance of the households. However, throughout the literature ... [more ▼]

In the Sahelian countries where extensive pastoral breeding is practiced, livestock plays an essential role in the socio-economic and dietary balance of the households. However, throughout the literature, this activity was submitted to various controversies including its contribution to the degradation of the environment; greenhouse gas emissions; its weak economic performance; etc. But other studies have noted the importance and efficiency of pastoral practice in a precarious natural environment such as the Republic of Niger, great stockbreeding country in the heart of the Sahel, with a herd of over 37 million heads. Thus, this research has tried to reposition the debate by emphasizing the role and importance of pastoral breeding in the Sahelian countries in general, particularly in Niger and specifically in the region of Diffa. Located between the desert zone in the North and the Sahelian zone in the South, the Region of Diffa is a pastoral area par excellence in Niger. Breeding, with a highly diversified livestock, is the dominant economic activity in the region. It concerns 95% of the population and contributes annually to 55% of the regional gross domestic product. However, this activity is submitted to various constraints, particularly biophysical and anthropogenic. In order to understand the pastoral dynamics in this region, a research work was initiated starting in 2010 and following a systemic approach. The work was built around three poles: Man-Natural Resources-Animals. A survey of 300 households (150 households with a sedentary herd and 150 with a mobile herd) was conducted during the first semester of 2012. Investigations were made on the basis of the prior identification of three agro-ecological zones (pastoral bowls, Komadougou River, Lake Chad) based on 100 households for each zone. The research results revealed that pastoral breeding in the region of Diffa is mutating. Herds (sedentary and mobile) are relatively small sized and increasingly composed in majority by small ruminants. The reproduction is carried out by a core of female spawners more or less stable and dominated by younger ones. Data cross analysis highlights the occurrence of recurrent fodder deficits, attributable to a series of annual rainfall deficits as well as animal diseases as the main causes of changing pastoral breeding in the region of Diffa. To deal with these problems the pastoral and agro-pastoral populations have built and developed a set of adaptive strategies to resist shocks and to mitigate their effects and to ensure the survival of households and livestock. However, over the years and the recurrence of shocks, traditional strategies for managing risks and uncertainties are being weakened with socio-economic consequences in pastoral and agro-pastoral households. An Intervention of the State, NGOs and / or associations and other development partners, would boost these strategies and strengthen the capacity of households to manage risk in the long term. [less ▲]

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See detailCover Songs Retrieval and Identification
Osmalsky, Julien ULg

Conference (2015, February 24)

Cover songs retrieval is a MIR task that has been widely studied in the recent years. The task, in its general sense, consists in retrieving covers for a given audio query. In this PhD, we focus on the ... [more ▼]

Cover songs retrieval is a MIR task that has been widely studied in the recent years. The task, in its general sense, consists in retrieving covers for a given audio query. In this PhD, we focus on the more specific task of cover songs *identification*. Given an unknown cover song query, we want to find relevant information about the original song, such as the title, the artist etc. Applications are live music recognition, plagiarism detections, query by examples, etc. Our approach is based on a pruning algorithm, whose role is to discard as quickly as possible as many tracks as possible from a search database in order to keep a smaller subset that should contain the tracks relevant to the query. We introduce the concept of *rejectors* for the pruning algorithm, which are single or combined classifier using multiple audio features for selecting relevant tracks. [less ▲]

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See detailResonant and antiresonant bouncing droplets
Hubert, Maxime ULg; Robert, Damien; Caps, Hervé ULg et al

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2015), 91

When placed onto a vibrating liquid bath, a droplet may adopt a permanent bouncing behavior, depending on both the forcing frequency and the forcing amplitude. The relationship between the droplet ... [more ▼]

When placed onto a vibrating liquid bath, a droplet may adopt a permanent bouncing behavior, depending on both the forcing frequency and the forcing amplitude. The relationship between the droplet deformations and the bouncing mechanism is studied experimentally and theoretically through an asymmetric and dissipative bouncing spring model. Antiresonance phenomena are evidenced. Experiments and theoretical predictions show that both resonance at specific frequencies and antiresonance at Rayleigh frequencies play crucial roles in the bouncing mechanism. In particular, we show that they could be exploited for bouncing droplet size selection. [less ▲]

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See detailA propos des fonctions continues nulle part dérivables
Esser, Céline ULg

Conference (2015, February 24)

En 1872, Karl Weierstrass choqua la communauté mathématique en présentant une famille de fonctions continues nulle part dérivables. Après la publication de ce résultat, beaucoup d'autres mathématiciens ... [more ▼]

En 1872, Karl Weierstrass choqua la communauté mathématique en présentant une famille de fonctions continues nulle part dérivables. Après la publication de ce résultat, beaucoup d'autres mathématiciens apportèrent leur propre contribution en construisant d'autres fonctions continues et nulle part dérivables. Dans cet exposé, nous présenterons les fonctions de Weierstrass. De plus, nous montrerons que le th eorème de Baire permet d'affirmer que l'ensemble des fonctions nulle part dérivables est dense dans l'ensemble des fonctions continues. Nous étudierons également la régularité ponctuelle de telles fonctions en utilisant la notion d'exposant de Hölder. [less ▲]

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See detailGenetic Heterogeneicity and Clinical Variability in Musculo contractural Ehlers-Danlos syndrome caused by Impaired Dermatan Sulfate Biosynthesis
Syx, Delfien; Van Damme, Tim; Symoens, Sofie et al

in Human Mutation (2015), 36(5), 535-547

Bi-allelic variants in CHTS-14, encoding dermatan 4-O sulfotransferase-1(D4ST-1), cause musculocontractural Ehlers-Danlos syndrome (MC-EDS), a recessive disorder characterized by connective tissue ... [more ▼]

Bi-allelic variants in CHTS-14, encoding dermatan 4-O sulfotransferase-1(D4ST-1), cause musculocontractural Ehlers-Danlos syndrome (MC-EDS), a recessive disorder characterized by connective tissue fragility, craniofacial abnormalities, congenital contractures and developmental abnormalities. Recently, the identification of bi-allelic variants in DSE, encoding dermatan-sulfate epimerase-1(DS-epi1), in a child with MC-EDS features, suggested locus heterogeneity of this condition. DS-epi1 and D4ST1 are crucial for biosynthesis of dermatan sulfate (DS) moieties in the hybrid chondoitin sulfate (CS)/DS glycosaminoglycans (GAGs). Here, we report four novel families with severe MC-EDS caused by unique homozygous CHST14 variants and a second family with a homozygous DSE missense variant, presenting a somewhat milder MC-EDS phenotype. The glycanation of a dermal DS protoglycan decorin is impaired in fibroblasts from D4ST1, as well as DS-epi1-deficient patients. However, D4ST1-deficiency, decorin GAG is completely replaced by CS, whereas in DS-epi1-deficency, still some DS moieties are present. The multisystemic abnormalities observed in our patients support a tight spatiotemporal control of the balance between CS and DS, which is crucial for multiple processes including cell differentiation, organ development, cell migration, coagulation and connective tissue integrity. [less ▲]

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See detailTwo-Photon Luminescence of Gold Nanorods Mediated by Higher Order Plasmon Modes
Verellen, Niels; Denkova, Denitza; De Clercq, Ben et al

in ACS Photonics (2015), 2

Metallic nanorod antennas can be considered as an analogue to classical half-wave dipole antennas, constituting an important tool for manipulating linear and nonlinear lightmatter interactions in ... [more ▼]

Metallic nanorod antennas can be considered as an analogue to classical half-wave dipole antennas, constituting an important tool for manipulating linear and nonlinear lightmatter interactions in nanoscale volumes. Using two-photon luminescence (TPL) scanning laser microscopy, we investigate such optical antennas beyond their fundamental dipole mode. The antenna mode dispersion is extracted from the nonlinear TPL measurement and reveals a TPL process that is dominated by plasmon-induced enhancement of the two photon absorption in the metal. Additionally, a clear signature of the mode parity is observed in the TPL images. TPL maxima are observed outside the antenna boundaries for even parity modes, whereas they are located inside for odd modes. It is concluded that for even modes the two-photon luminescence emission is strongly mediated by retardation of the excitation field, a consequence of their zero net-dipole moment. This selective excitation of different mode parities is highly relevant for nanoscale enhanced nonlinear optics, as well as plasmonic nanosensor applications and tuning of radiative properties of quantum emitters. [less ▲]

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See detailInorhanic and organic carbon spatial variability in the Congo River during high waters (December 2013) and low waters (June 2014)
Borges, Alberto ULg; Bouillon, S; Teodoru, C et al

Conference (2015, February 23)

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See detailBiologie du développement (partim. animal)
Peers, Bernard ULg

Learning material (2015)

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See detailMédiations numériques de la lecture
Barnabé, Fanny ULg

Scientific conference (2015, February 23)

Séance de séminaire sur la médiation que représente le numérique dans la lecture littéraire.

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See detailSolidarities and Learning: Reporting Incidents in a Nuclear Research Center
Rossignol, Nicolas ULg

Scientific conference (2015, February 23)

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See detailLes plantes qui nous soignent : de la tradition à la médecine moderne
Frederich, Michel ULg

Scientific conference (2015, February 23)

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See detailPenser le vieillissement de la population pour la Wallonie de demain
Delvenne, Pierre ULg

Conference given outside the academic context (2015)

Detailed reference viewed: 24 (1 ULg)