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See detailFacultative paedomorphosis in the Alpine newt, Triturus a. alpestris: feeding and spatial advantages of paedomorphs in an Alpine lake
Denoël, Mathieu ULg; Joly, Pierre; Poncin, Pascal ULg et al

Poster (1998)

Paedomorphosis in newts and salamanders is defined as the retention of larval morphology in reproductive adults. In Triturus, Paedomorphosis is facultative because some larvae transform while other retain ... [more ▼]

Paedomorphosis in newts and salamanders is defined as the retention of larval morphology in reproductive adults. In Triturus, Paedomorphosis is facultative because some larvae transform while other retain larval characteristics such as gill slits and mature as Paedomorph. This heterochronic process is thought to be an important micro- and macroevolutionary mechanism. In a population of a French alpine lake (le lac de la Cabane), Alpine newt Paedomorphs (Triturus a. alpestris) are abundant and coexist with a Metamorph minority. The coexistence of both morphs and the dominance of one on the other beg a few questions such as what ecological factors favour the paedomorph strategy. In this study, we analysed the feeding and spatial distribution of the Paedomorphs and Metamorphs of the Lac de la Cabane in June, July, August and October 1998. Newts were caught in the main four microhabitats of the lake : the shore, the bottom (3-7 meters deep), the water column and the surface, at dawn, during the day and in the evening. In this way, we caught 1481 newts to record their spatial position. We flushed the stomachs of 822 of these newts (the total prey number identified is more than 60 thousand). The feeding strategies of Metamorphs and Paedomorphs are very different : while Paedomorphs prey principally on plankton (Daphnia, Chydorus, ...), Metamorphs prey on a lot of exogenous invertebrates (flyes, aphids, ...). This characteristic is observed for males, females and juveniles. Cladocerans are also eaten by Metamorphs, but in much smaller quantity. The Paedomorph newts live in all the microhabitats of the lake while Metamorphs are hardly ever found on the deep bottom and in the water column. The spatial niche of Metamorphs is thus smaller than that of Pedomorphs. The data presented here suggest that the success of both morphs can be strongly influenced by environmental conditions, and that Paedomorphosis may be maintained and favoured by the spatial and feeding advantages of Paedomorphs into a deep lake. [less ▲]

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See detailFacultative paedomorphosis in the Alpine newt, Triturus a. alpestris: feeding habits and habitat use in an Alpine lake
Denoël, Mathieu ULg; Joly, Pierre; Poncin, Pascal ULg

in Miaud, C.; Guyetant, G. (Eds.) Current Studies in Herpetology (1999)

Feeding habits and micro-habitat use were compared between metamorphs and paedomorphs in a population of the Alpine newt, Triturus a. alpestris in the French Alps. This population occupies a deep Alpine ... [more ▼]

Feeding habits and micro-habitat use were compared between metamorphs and paedomorphs in a population of the Alpine newt, Triturus a. alpestris in the French Alps. This population occupies a deep Alpine lake. The paedomorphs largely outnumbered the metamorphs. Whereas paedomorph diet was mainly composed of plankton, that of metamorphs was especially composed of larval and adult insects. The spatial use of the habitat also differed between the two forms: the paedomorphs occupied all the micro-habitats (shore, bottom, water column and surface) while the metamorphs were only found along the shore and at the water surface. In such a deep lake paedomorphosis may have persisted because of a different use of both feeding resources and micro-habitat [less ▲]

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See detailLa Faculté des Sciences Agronomiques de Gembloux (Belgique) fête ses 125 ans
Rondeux, Jacques ULg

in Revue Forestière Française (1986), 38(6), 582-584

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See detailFAD : quelles stratégies pour garder l'apprenant en ligne ?
Vandeput, Etienne ULg; Henry, Julie ULg

in Sidir, Mohamed; Bruillard, Éric; Baron, Georges-Louis (Eds.) Acteurs et Objets Commmunicants. Vers une éducation orientée objets ? (2010)

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See detailFAD: augmenter l'interactivité pour diminuer la distance?
Henry, Julie ULg; Vandeput, Etienne ULg; Denis, Brigitte ULg

in Actes du Colloque scientifique Ludovia 2010 (2010, August)

Peut-on réellement prétendre qu'en contexte de formation à distance (FAD) l'interactivité brise la distance ? En théorie, une démarche de conception de FAD axée à la fois sur le respect de critères ... [more ▼]

Peut-on réellement prétendre qu'en contexte de formation à distance (FAD) l'interactivité brise la distance ? En théorie, une démarche de conception de FAD axée à la fois sur le respect de critères ergonomiques, sur des stratégies et des outils stimulant l'activité des apprenants et la communication entre acteurs du dispositif va dans ce sens. Encore faut-il la mettre concrètement en oeuvre. Cet article traite de l'interactivité comme solution aux diverses contraintes rencontrées par les apprenants en situation de FAD. Les auteurs alimentent leurs réflexions au travers de champs disciplinaires variés tels que l'ergonomie des interfaces homme-machine, la psychopédagogie et la communication (synchrone et asynchrone). Dans chacun de ces champs, ils répertorient quelques bonnes pratiques pour la conception d'un dispositif de FAD « interactive ». [less ▲]

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See detailFaded Dreams - M. Carnoy
Martiniello, Marco ULg

in New Community (1996), 22(3), 547-548

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See detailFading of Modern Prussian Blue Pigments : Preliminary Study
Samain, Louise ULg; Sougrati, Moulay T.; Hatert, Frédéric ULg et al

Poster (2009, June)

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See detailFading of modern Prussian blue pigments in linseed oil medium
Samain, Louise ULg; Silversmit, Geert; Sanyova, Jana et al

in Journal of Analytical Atomic Spectrometry [=JAAS] (2011), 26(5), 930

The fading of modern laboratory-synthesized and commercial Prussian blue, iron(III) hexacyanoferrate(II), based pigments in a linseed oil medium during exposure to light has been investigated. The ... [more ▼]

The fading of modern laboratory-synthesized and commercial Prussian blue, iron(III) hexacyanoferrate(II), based pigments in a linseed oil medium during exposure to light has been investigated. The Prussian blue pigments were painted from linseed oil, as a pure pigment and mixed with white lead, (PbCO3)2Pb(OH)2, zinc white, ZnO, or titanium white, TiO2, pigment. The samples were subjected to accelerated ageing for 800 hours and the light fastness of the Prussian blue pigment was evaluated by reference to blue wool standards. Pure Prussian blue is extremely light fast whilst it strongly fades when mixed with a white pigment, especially with lead white or zinc oxide. The painted samples were studied by UV-visible, iron K-edge X-ray absorption, iron-57 transmission Mössbauer, and attenuated total reflectance infrared spectroscopy. X-ray absorption results reveal a decrease in the iron coordination number in aged samples in the presence of white pigment. The Mössbauer spectra of the pure Prussian blue and the unaged and aged mixtures of Prussian blue and lead white or zinc oxide at 1:100 and 1:10 dilution ratios, respectively, indicate the presence of iron(II) and iron(III) in a ratio close to one as expected for the bulk stoichiometric KFeIII[FeII(CN)6]; no change in the spectral parameters was observed upon ageing. Combined with the X-ray near edge absorption and infrared studies, these results suggest reduction of the surface iron ions in the Prussian blue with ageing upon exposure to light. [less ▲]

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See detailFading of modern Prussian blue pigments in linseed oil medium
Samain, Louise ULg; Silversmit, Geert; Sanyova, Jana et al

Poster (2011, February 04)

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See detailFaecal bacterial dgge profiles of Crohn's disease patients are different from those of their healthy first degree relatives and matched healthy controls
Joossens, Marie; Vanhoutte, Tom; De preter, Vicky et al

in Journal of Crohn’s and Colitis [=JCC] (2007), 1(1), 55

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See detailFaecal bacterial dgge profiles of Crohn's disease patients are different from those of their healthy first degree relatives and matched healthy controls
Joossens, M.; Vanhoutte, T.; De Preter, V. et al

in Gastroenterology (2007), 132(4), 704-704

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See detailFaecal bacterial DGGE profiles of Crohn’s disease patients are different from those of their healthy first degree relatives and matched healthy controls
Joossens, M.; Vanhoutte, T.; De Preter, V. et al

in Acta Gastro-Enterologica Belgica (2007)

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See detailFaecal bacterial molecular profiles of Crohn’s disease patients differ from their healthy relatives and matched healthy controls.
Joossens, M.; De Preter, V.; Vanhoutte, T. et al

in Gut (2007), 56(Suppl III), 5

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See detailFagraldehyde, a Secoiridoid Isolated from Fagraea fragrans
Jonville, Marie ULg; Capel, Marie; Frederich, Michel ULg et al

in Journal of Natural Products (2008), 71(12), 2038-2040

A secoiridoid aglycone with atypical skeleton, named fagraldehyde (1), together with several known secoiridoids (gentiopicroside (2), sweroside (3) and swertiamarin (4)) were isolated from the bark and ... [more ▼]

A secoiridoid aglycone with atypical skeleton, named fagraldehyde (1), together with several known secoiridoids (gentiopicroside (2), sweroside (3) and swertiamarin (4)) were isolated from the bark and leaves of Fagraea fragrans collected in Cambodia. The conformations of 1 were evaluated on the basis of molecular modeling and NOESY correlations. A hypothetical biogenesis of fagraldehyde was proposed to explain the unusual skeleton. Compound 1 was weakly active in vitro against Plasmodium falciparum. [less ▲]

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See detailFaible agressivité des eaux de fonte des glaciers: l'exemple de la Marmolada (Dolomites)
Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1966), 89(6), 177-188

From some measurements of pH and hardness in melt-waters of the Marmolada Glacier (Dolomites), it appears that these waters are - or at least were in September 1965 - strongly alkaline and not very ... [more ▼]

From some measurements of pH and hardness in melt-waters of the Marmolada Glacier (Dolomites), it appears that these waters are - or at least were in September 1965 - strongly alkaline and not very aggressive towards their limestone bedrock; pH on the glacier and just nearby are between 8.8 and 7.8. Calculated CO2 pressure is lower in the glacier (3.6 10 -4 atm) than in anyone of four other samples analysed in the region. [less ▲]

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