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See detailTowards the identification of cis-elements responsible for the high expression of HMA4, an essential gene for Zn hyperaccumulation in Arabidopsis halleri.
Spielmann, Julien ULg; Nouet, Cécile ULg; Scheepers, Maxime ULg et al

Conference (2015, June 26)

A. halleri is a Zn and Cd hypertolerant and hyperaccumulator plant which stores metals in shoot vacuoles. One key step for hyperaccumulation is a highly efficient root-to-shoot translocation of metals ... [more ▼]

A. halleri is a Zn and Cd hypertolerant and hyperaccumulator plant which stores metals in shoot vacuoles. One key step for hyperaccumulation is a highly efficient root-to-shoot translocation of metals. The Zn/Cd plasmamembrane pump HMA4 (heavy metal ATPase 4) plays a central role in this process and is involved in xylem loading/unloading. Moreover, HMA4 is overexpressed in A. halleri compare to its non-tolerant and non-hyperaccumulator sister, Arabidopsis thaliana. The HMA4 overexpression is determined by a combination of gene triplication and cis-regulatory changes increasing transcription levels of each three HMA4 copies. In this study, we are focusing on the two most active HMA4 promoters and we aim to identify the cis-elements underlying high expression of HMA4 in A. halleri using promoter-reporter constructs. Through deletion analysis, two important regions for a high expression have been identified. Ongoing analysis of more detailed deletions will be presented. [less ▲]

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See detailInfluence of terroir on the fungal assemblages associated to common bean seed
Klaedtke, Stephanie ULg; Jacques, Marie-Agnès; Chable, Véronique et al

Conference (2015, June 25)

Plants have evolved in association with microbial assemblages, also known as microbiota, which can affect plant growth and health. In contrast with other plant habitats, microbiota associated to seeds ... [more ▼]

Plants have evolved in association with microbial assemblages, also known as microbiota, which can affect plant growth and health. In contrast with other plant habitats, microbiota associated to seeds have only recently become an object of research. First surveys reveal that seed-associated microbial assemblages are composed of 50 to 1000 bacterial and fungal operational taxonomic units (OTUs) (Barret et al., 2015), including plant pathogens. Common bean (Phaseolus vulgaris L.) is affected by several seed-borne pathogens representing a phytosanitary challenge for common bean seed production. In a participatory research project (Farm Seed Opportunities, a European FP6 project), small scale organic seed producers emitted the hypothesis that seed microbiota in their integrity, including pathogens, play a role in shaping the crop as it adapts to local environments, leading to more resilience (Döring et al., 2014). As a first step to investigating this hypothesis, we analyzed 27 bean seed samples to assess whether the seed microbiota are indeed site-dependant or in contrary transmitted from on plant generation to the next within each cultivar. [less ▲]

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See detailIs western lowland gorilla a good gardener? Effect of fecal matrix and deposition at nest sites on seedling growth
Haurez, Barbara ULg; Brostaux, Yves ULg; Petre, Charles-Albert ULg et al

Conference (2015, June 25)

The Western lowland gorilla is a key dispersal agent, which disperses viable seeds of various size. In consequence of its nesting behavior, gorilla deposits half of its feces, and therefore about half of ... [more ▼]

The Western lowland gorilla is a key dispersal agent, which disperses viable seeds of various size. In consequence of its nesting behavior, gorilla deposits half of its feces, and therefore about half of dispersed seeds, at nest sites. This study was conducted in a logging concession of southeast Gabon where 78 % of the observed nest sites (n=183) were installed in open canopy terra firma forest. The aim of this research was to assess if seed deposition by gorillas (i) in fecal matrix and (ii) at nest sites is advantageous for seedling growth. To assess the effect of fecal matrix, seeds of Santiria trimera (Burseraceae), Chrysophyllum lacourtianum (Sapotaceae) and Plagiostyles africana (Euphorbiaceae) collected in gorilla feces were sown with and without fecal matrix in a nursery at the study site. The impact of seed deposition at nest sites on seedling growth was evaluated in situ. Seedlings of Santiria trimera and Dacryodes normandii (Burseraceae) were installed at nest sites and at closed canopy terra firma forest sites. For both type of trials, seedling growth was monitored. [less ▲]

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See detailCaractéristiques des patchs dans les herbiers à Posidonia oceanica. Origine naturelle versus origine anthropique
Abadie, Arnaud ULg

Scientific conference (2015, June 25)

La plante marine endémique de Méditerranée Posidonia oceanica, ou posidonie, forme en Corse des herbiers colonisant les substrats depuis la surface jusqu’à 40 m de profondeur. Ces herbiers constituent un ... [more ▼]

La plante marine endémique de Méditerranée Posidonia oceanica, ou posidonie, forme en Corse des herbiers colonisant les substrats depuis la surface jusqu’à 40 m de profondeur. Ces herbiers constituent un véritable écosystème, l’un des plus riches en espèces de Méditerranée. Ils sont notamment soumis à des phénomènes de fragmentation naturels (hydrodynamisme) et anthropiques (par exemple l’ancrage, le chalutage, la pollution) à l’origine de la formation de patchs (ou "intermattes"), créant des zones de contact entre habitats de nature disparate. Issus de phénomènes différents, les patchs auront ainsi des caractéristiques et une dynamique propre. Les présents travaux de recherche ont été réalisés en baie de Calvi à 15 m de profondeur et visent à comparer les caractéristiques de patchs naturels générés par l’hydrodynamisme, et de patchs anthropiques issus de l’ancrage intensif. Dans cette optique, un patch de chaque type a été sélectionné et cartographié par triangulation à l’aide de balises afin d’étudier précisément leur dynamique spatiale. Les patchs au sein des herbiers à P. oceanica étant en grande partie composés de sédiments, le flux de déposition des particules a été étudié à l’aide de pièges à sédiments. Les caractéristiques chimiques du sédiment ayant une importante influence sur le développement de la posidonie, l’oxygène (O2), un composé vital, et le sulfure d’hydrogène (H2S), un composé létal, ont été mesurés à différentes profondeurs dans la couche sédimentaire et comparés avec les valeurs obtenues dans l’herbier adjacent. Des données ont été récoltées en hiver et en été afin de prendre en compte la variation saisonnière des phénomènes biotiques et abiotiques. Le suivi de la dynamique spatiale des patchs montre que, concernant le patch naturel, l’érosion de l’herbier (-10,3 cm.a-1) est compensée par sa colonisation (+10,1 cm.a-1), alors qu’une très grande proportion du patch d’ancrage (64 %) est érodée. Le flux de particules dans les patchs est de façon générale très faible en été (de 1,71 à 4,45 gDW.m-².d-1) par rapport à l’hiver (de 32,17 à 91,48 gDW.m-².d-1). Le dépôt total de particule est beaucoup plus important au sein du patch d’ancrage en hiver. Les deux patchs montrent des profils de concentration en oxygène et en sulfure d’hydrogène dans le sédiment similaire en hiver et contrastés en été, avec une concentration importante en sulfure dans le patch d’ancrage (9,3 µM à 10 cm de profondeur), limitant la potentielle recolonisation par l’herbier environnant. [less ▲]

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See detailRobustifier nos analyses de données: un must!
Aerts, Stéphanie ULg

Conference given outside the academic context (2015)

Financiers, biologistes, psychologues, économistes ou chimistes,… tous utilisent des outils statistiques pour prédire, expliquer, modéliser, comprendre des processus spécifiques à leur domaine. Néanmoins ... [more ▼]

Financiers, biologistes, psychologues, économistes ou chimistes,… tous utilisent des outils statistiques pour prédire, expliquer, modéliser, comprendre des processus spécifiques à leur domaine. Néanmoins, les résultats de toute analyse statistique, de la plus simple à la plus complexe, peuvent être fortement influencés, voire renversés, par la présence d’une seule valeur atypique. S’il est assez aisé de surmonter ce problème pour de simples ensembles de données, lorsque plusieurs caractéristiques sont mesurées simultanément, disposer de méthodes robustes nécessite l’emploi d’algorithmes alliant à la puissance actuelle de nos ordinateurs, des théorèmes mathématiques parfois vieux de plus de 50 ans. A l’heure où on dispose de bases de données de plus en plus grandes mais de qualité inégale, il est indispensable que les praticiens se familiarisent avec les statistiques robustes afin de fiabiliser leurs conclusions. [less ▲]

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See detailDUSP3 Phosphatase Deficiency or Inhibition Limits Platelet Activation and Arterial Thrombosis
Rahmouni, Souad ULg; MUSUMECI, Lucia ULg; Kuipers, Marijke J et al

Conference (2015, June 24)

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See detailLes complications rénales du diabète
Krzesinski, Jean-Marie ULg

Conference (2015, June 24)

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See detailGalectin-3 and suppression of tumorignenicity 2 measurment in participat at the "Tor des Géants"
LE GOFF, Caroline ULg

in Final programme European College of sport Science (2015)

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See detailDUSP3 Phosphatase Deficiency or Inhibition Limits Platelet Activation and Arterial Thrombosis
Rahmouni, Souad ULg; MUSUMECI, Lucia ULg; Kuijpers, Marijke J et al

Conference (2015, June 24)

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See detailA hydrochemical - isotopic approach for assessing factors controlling the regional pollution of an urban aquifer
Gesels, Julie ULg; Orban, Philippe ULg; Popescu, Ileana-Cristina et al

Poster (2015, June 24)

The alluvial aquifer of the Meuse River is contaminated at regional scale in the urbanized and industrialized area of Liège in Belgium, in particular inorganics pollutants such as sulfate, nitrate and ... [more ▼]

The alluvial aquifer of the Meuse River is contaminated at regional scale in the urbanized and industrialized area of Liège in Belgium, in particular inorganics pollutants such as sulfate, nitrate and ammonium. The sources of those contaminants are numerous: brownfields, urban waste water, subsurface acid mine drainage from former coal mines, atmospheric deposits related to former pollutants emissions in the atmosphere ... Sulfate, nitrate and ammonium are both typical pollutants of the aquifer and tracers of the possible pollution sources. In the Water Framework Directive context, a detailed hydrogeochemical characterization of groundwater was performed. The aim is to determine the origin of the inorganic contaminations, the main processes contributing to poor groundwater quality and the spatial extent of the contaminations. A large hydrochemical sampling campaign was performed, based on 71 selected representative sampling locations, to better characterize the different vectors (end-members) of contamination of the alluvial aquifer and their respective contribution to groundwater contamination in the area. Groundwater samples were collected and analyzed for major and minor compounds and metallic trace elements. The analyses also include stable isotopes in water, sulfate, nitrate, ammonium, dissolved inorganic carbon, boron and strontium. Different hydrogeochemical approaches are combined to obtain a global understanding of the hydrogeochemical processes at regional scale. Hydrochemical interpretations are based on classical diagrams, spatial distribution maps, geochemical equations, multivariate statistics such as self-organizing maps and isotopic analyses. With this combined approach, the location of the contaminant sources and most contaminated sectors of the alluvial aquifer together with a better understanding of geochemical processes involved are obtained. Redox processes strongly influence the composition of groundwater, specifically for compounds degrading the quality of groundwater in the area (sulfate, nitrate and ammonium). The highest concentrations of sulfate can be associated with the post-mining stage in the acid mine drainage process. Various reactions involving nitrogen compounds have been identified and allow a better understanding of causes of high concentrations of ammonium and nitrate. Denitrification and sulphate reduction are also demonstrated based on isotopic ratios. [less ▲]

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See detailWood Acid Hydrolysate as a Feedstock for Chlorella Growth
Miazek, Krystian ULg; Goffin, Dorothée ULg; Richel, Aurore ULg et al

Scientific conference (2015, June 24)

In this work, the effect of beech (Fagus sylvatica) wood acid hydrolysate on growth of Chlorella sorokin-iana was evaluated. Experiments carried out in this study show that neutralized wood acid ... [more ▼]

In this work, the effect of beech (Fagus sylvatica) wood acid hydrolysate on growth of Chlorella sorokin-iana was evaluated. Experiments carried out in this study show that neutralized wood acid hydrolysate can vastly improve Chlorella growth, due to the presence of organic carbon. However, simultaneously the suppression of Chlorella growth at the onset of cultivation was observed, presumably due to inhibitory substances, and this effect was more pronounced with the increase of hydrolysate dosage. Beech wood acid hydrolysate can be a valuable feedstock to stimulate Chlorella growth, on condition that inhibitory level of hydrolysate loading is avoided. [less ▲]

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See detailSuperstudio’s Dystopian Tales: Textual and Graphic Practice as Operational Method
Prina, Daniela ULg

in Writing Visual Culture (2015), 6

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See detailIUVS periapse observations of Mars’ Nitric Oxide
Stiepen, Arnaud ULg; IUVS team

Scientific conference (2015, June 24)

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See detailAlma @ ULg : Déploiement d'Alma à l'Université de Liège
Renaville, François ULg

Conference given outside the academic context (2015)

Présentation du projet de migration de Aleph et SFX vers le système de gestion de bibliothèque (SGB) Alma d'août 2014 à février 2015.

Detailed reference viewed: 22 (1 ULg)