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See detailFomento de la práctica reflexiva sobre el aprendizaje mediante el uso de tecnologías móviles
Tabuenca, B; Verpoorten, Dominique ULg; Ternier, S et al

in RED. Revista de Educación a Distancia (2013)

Durante 2 días de escuela y 2 días libres, se ofrece a 37 alumnos de educación secundaria llevar a cabo un ejercicio de reflexión diaria y e informar acerca de la intensidad de aprendizaje de su día y los ... [more ▼]

Durante 2 días de escuela y 2 días libres, se ofrece a 37 alumnos de educación secundaria llevar a cabo un ejercicio de reflexión diaria y e informar acerca de la intensidad de aprendizaje de su día y los canales utilizados. Este experimento piloto tuvo 2 propósitos: a) evaluar la medida en que el teléfono móvil puede utilizarse como instrumento para desarrollar la conciencia sobre el aprendizaje y b) explorar cómo los jóvenes atienden a su identidad como estudiante (permanente) cuando se les pide que reflexionar sobre este tema. Los resultados muestran que los estudiantes aceptaron responder a las preguntas sobre el aprendizaje enviados a sus propios dispositivos móviles y fuera del horario escolar. El estudio también proporciona indicios de que conseguir conocer y reflexionar acerca de su identidad como estudiantes (profesionales), no es una práctica común y comprensible para los participantes. Estos hallazgos, que cuestionan la vida cotidiana de los jóvenes desde una perspectiva de aprendizaje, se examinan invocando a la creación de un aprendizaje consciente, responsable y comprometido. [less ▲]

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See detailFomitiporia punctata (Basidiomycota, Hymenochaetales) and its presumed taxonomic synonyms in America: taxonomy and phylogeny of some species from tropical/subtropical areas.
Decock, Cony; Figueroa, Sara Herrera; Robledo, Gerardo et al

in Mycologia (2007), 99(5), 733-52

The status of the F. punctata complex in tropical/subtropical America, and more specifically in Cuba and the surrounding area, was partially assessed. Fomitiporia langloisii, Fomitiporia dryophila and ... [more ▼]

The status of the F. punctata complex in tropical/subtropical America, and more specifically in Cuba and the surrounding area, was partially assessed. Fomitiporia langloisii, Fomitiporia dryophila and Fomitiporia maxonii, three names long considered taxonomic synonyms of F. punctata, are recognized as representing three distinct species that are distinguished from the latter on the basis of morphological, molecular and ecological (biogeographical) data. The three species are described again and their preliminary phylogenetic relationships within Fomitiporia are discussed. Fomitiporia tabaquilio comb. nov. is proposed. The status of Fomitiporia in America and its present circumscription are discussed. [less ▲]

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See detailFomitiporia tenuis and Fomitiporia aethiopica (Basidiomycetes, Hymenochaetales), two undescribed species from the Ethiopian highlands: taxonomy and phylogeny.
Decock, Cony; Bitew, Adane; Castillo Cabello, Gabriel ULg

in Mycologia (2005), 97(1), 121-9

Fomitiporia tenuis sp. nov. and Fomitiporia aethiopica sp. nov. from the Ethiopian highlands are described. Both are characterized by a resupinate habit, globose, dextrinoid basidiospores, cystidioles ... [more ▼]

Fomitiporia tenuis sp. nov. and Fomitiporia aethiopica sp. nov. from the Ethiopian highlands are described. Both are characterized by a resupinate habit, globose, dextrinoid basidiospores, cystidioles, and respectively scarcity or absence of hymenial setae. Fomitiporia pseudopunctata and F. robusta are reported also in the same area. The preliminary phylogenetic relationships of F. tenuis, F. aethiopica and F. pseudopunctata are inferred from parsimony analysis based on partial nuclear ribosomal large subunit (nrLSU). A preliminary key to the poroid Hymenochaetales with dextrinoid basidiospores (Fomitiporia, Phellinus s.l., Pseudoinonotus) is proposed. [less ▲]

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See detailLe foncier en pratique : la délimitation de Zones Villageoises d’Intérêt Cynégétique en périphérie du parc du W
Vermeulen, Cédric ULg; Lamon, A.; Kabore, B. et al

in VertigO : la Revue Electronique en Sciences de l'Environnement (2007)

Le Burkina Faso est le seul pays d’Afrique occidentale dont la législation autorise la gestion cynégétique de la faune par les populations locales. L’opportunité de construire une conservation de la faune ... [more ▼]

Le Burkina Faso est le seul pays d’Afrique occidentale dont la législation autorise la gestion cynégétique de la faune par les populations locales. L’opportunité de construire une conservation de la faune servant directement le développement local existe donc. Dans la pratique des choses, il reste cependant encore beaucoup d’étapes à franchir avant que des Zones Villageoises d’Intérêt Cynégétiques (ZOVIC) réellement autonomes et indépendantes financièrement ne prennent corps. La gestion cynégétique villageoise recouvre un ensemble d’enjeux variés et ouvre la porte à de nombreux questionnements : internes à la communauté d’abord, dans son rapport à l’espace et au foncier ; quant au fonctionnement des structures locales de gestion et leur fusion avec le système politique coutumier local ensuite, ainsi que de la réelle volonté de l’univers administratif et privé de la chasse à partager la rente avec les populations locales. [less ▲]

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See detailFonck meurt premier comme devant
Bechet, Christophe ULg

E-print/Working paper (2014)

Cet article revient sur le mythe du cavalier Fonck, premier soldat belge tué le 4 août 1914, sur la route Thimister-Battice

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See detailLa fonction centrale du thymus dans la reconnaissance des fonctions neuroendocrines par les lymphocytes T au cours de leur développement
Geenen, Vincent ULg; Martens, Henri ULg; Cormann-Goffin, N. et al

in Archives Internationales de Physiologie, de Biochimie et de Biophysique (1993), 101(4, Jul-Aug), 19-22

The dual physiological role of the thymus in T cell positive and negative selection appears prominent in the establishment of appropriate host immune defenses. However, the cellular and molecular ... [more ▼]

The dual physiological role of the thymus in T cell positive and negative selection appears prominent in the establishment of appropriate host immune defenses. However, the cellular and molecular mechanisms underlying those thymic functions begin only to be understood. On the basis of our previous investigations about the thymic expression of different neuroendocrine-related signals, we have advanced a model which transposes at the peptide level the intervention of this primary lymphoid organ in both T cell positive and negative selective processes. There is now ample evidence that the thymic subcapsular and medullary epithelium is the site for synthesis of neurohypophysial (NHP)-related peptides (reviewed in Geenen et al., 1992a). We have also demonstrated that the epithelial component of thymic "nurse" cells (TNC) synthesizes NHP-related peptides and expresses a neuroendocrine-like phenotype (Geenen et al., 1988a). This observation was a remarkable example of the intimate neuroendocrine-immune interactions that take place during T cell ontogeny. Further immunocytochemical analyses have confirmed that one dominant NHP-related epitope belongs to the oxytocin (OT) lineage of the NHP peptide superfamily (Robert et al., 1991, 1992). The intrathymic coexpression of this OT-like epitope with a neurophysin protein domain is a strong argument for a local synthetic process similar to the hypothalamo-NHP one. However, the absence of ir-OT in secretory granules of thymic epithelial cells (TEC), as well as of NHP-related peptides in the supernatant of TEC cultures questioned the application to the thymus of the classical neurosecretory model established for hypothalamic magnocellular neurons (Scharrer [less ▲]

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See detailLa fonction de Cantor
Simons, Laurent ULg

Master's dissertation (2009)

Ce mémoire est une introduction à l'étude de la bijection de Cantor, bijection entre l'intervalle unité et le carré unité.

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See detailFonction de référent hospitalier pour la continuité des soins : une démarche d’aide à la décision
Gosset, Christiane ULg; Moons, Philippe; Pasquasy, Nathalie

Report (2005)

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See detailFonction de Riemann généralisée
Simons, Laurent ULg; Bastin, Françoise ULg; Nicolay, Samuel ULg

Conference (2014, September 22)

Dans cet exposé, nous étudions la régularité de la fonction de Riemann généralisée~$R_{\alpha,\beta}$ (avec $\alpha>1$ et $\beta>0$) définie par \[ R_{\alpha,\beta}(x)=\sum_{n=1}^{+\infty}\frac{\sin(\pi n ... [more ▼]

Dans cet exposé, nous étudions la régularité de la fonction de Riemann généralisée~$R_{\alpha,\beta}$ (avec $\alpha>1$ et $\beta>0$) définie par \[ R_{\alpha,\beta}(x)=\sum_{n=1}^{+\infty}\frac{\sin(\pi n^\beta x)}{n^\alpha},\quad x\in\R. \] En particulier, nous déterminons son exposant de Hölder uniforme. Pour terminer, nous analysons le comportement de~$R_{\alpha,\beta}$ lorsque le paramètre $\alpha$ ou $\beta$ tend vers l'infini. Cet exposé est basé sur un travail en collaboration avec F. Bastin et S. Nicolay. [less ▲]

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See detailLa fonction endocrinienne et métabolique du poumon
Lamy, Maurice ULg; Faymonville, Marie ULg; Deby, Ginette ULg et al

in La pathologie respiratoire en anesthésie-réanimation (1984)

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See detailFonction et signification de l'image égyptienne
Laboury, Dimitri ULg

in Bulletin de la Classe des Beaux-Arts de l'Académie Royale de Belgique, 6e série (1998), IX

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See detailLa fonction exponentielle : premières propriétés
Bair, Jacques ULg; Henry, Valérie ULg

in Tangente Sup (2013), 69

Nous passons en revue différentes façons d'introduire des fonctions exponentielles et logarithmes, montrant notamment comment procédait Euler en exploitant des infinitésimaux.

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See detailLa fonction guidage en micromécanique
Merken, Patrick; Debongnie, Jean-François ULg

Book published by DEBONGNIE (JEAN-FRANCOIS) (2010)

1) Modelling the stiffness of a circular notch hinge subjected to flexure, torsion or shear : asymptotic values for a vanishing thickness and correction factors for the general case. 2) Flexible membrane ... [more ▼]

1) Modelling the stiffness of a circular notch hinge subjected to flexure, torsion or shear : asymptotic values for a vanishing thickness and correction factors for the general case. 2) Flexible membrane : stiffness for vanishing radius ratio and correction factor for the general case. 3) Conclusion. 4) Appendices, including a summary of useful formulae. [less ▲]

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See detailLa fonction mitochondriale des cellules musculaires squelettiques équines en culture : effet de l'anoxie et des neutrophiles activés.
Ceusters, Justine ULg

Doctoral thesis (2012)

Introduction Horses are known to be remarkable athletes. However, to realize such repeated intense exercises, as competition horses do, and could also became a stressing condition leading to muscular ... [more ▼]

Introduction Horses are known to be remarkable athletes. However, to realize such repeated intense exercises, as competition horses do, and could also became a stressing condition leading to muscular dysfunctions but could also decrease their performances. In horses, lesions from ischemia/reperfusion are found in numerous clinical situations but also during intense exercise, the muscular oxygenation decreasing as a function of the exercise intensity. But it is during the reoxygenation, with the subsequent increase of the electron flux within the mitochondrial respiratory electron transport chain at the cessation of exercise, that an important increase of the reactive oxygen and nitrogen species (RNOS) production will be observed. The realization of such intense exercise provokes also an important systemic inflammatory reaction. Recently, some studies realized by our group on competing horses showed that intense exercise can activate the polymorphonuclear neutrophils (PMNs) which degranulate their myeloperoxidase (MPO) and elastase (ELT). The increase of MPO was not only plasmatic but also muscular, where it was associated with a decrease of the mitochondrial complex I activity, showing there a possible link between the MPO activity and the mitochondrial dysfunction in horses performing exercise. The relationship between ischemia/reperfusion, ROS production from mitochondria, muscular damages and inflammatory reaction is largely unexplored in horses. The principal objectives of this work were to study, on a primary culture of equine skeletal muscle cells obtained from muscular microbiopsies, the effect of anoxia/reoxygenation (A/R) and/or of MPO on their ROS production and mitochondrial respiratory function. Results Primary culture of equine skeletal muscle cells from muscular microbiopsies With muscular microbiopsies, we developed an efficient and convenient sampling method, usable in current practice and even on high level competing horses. By using the microbiopsies as explants, we obtained a primary culture of skeletal muscle cells, a suitable experimental model for the in vitro study of equine muscular function. Model of anoxia/reoxygenation applied on cultured equine skeletal muscle cells Thanks to the primary culture, we showed by fluorescence spectroscopy and gas chromatography, an increased ROS production by adherent cells submitted to 2 h of A/R. For the following investigations, 2 other models were designed on detached cells : a first one of cyclic A/R (2 x 30 min) and a second one of a single long period of 1 h, 2 h or 3 h of A/R. The first one showed a decrease of the routine respiration, but also of ROS production and of the mitochondrial complex I specific activity of the cells submitted to cyclic A/R. After a single long period of A/R, on the contrary, the routine respiration, the ROS production and the mitochondrial complex I specific activity of the cells were increased while the ATP production by these cells was decreased. This observation, arguing for an uncoupling of the oxidative phosphorylation, prompted us to investigate the uncoupling protein 3 (UCP3) expression by cultured cells. The indirect immunofluorescence, as well as the electrophoresis coupled with the western blot, showed that they expressed UCP3, in normoxia and after 2 h of A/R, but also that this expression varied as a function of the duration of the A/R, with a maximum observed for 2 h. The oxygraphic phosphorylation control protocol (PCP) applied on detached cells showed an increase of their routine but also of their non phosphorylating (after ATP synthase inhibition) respirations after a single long period of 2 h A/R. Their maximal respiratory capacity, per contra, decreased significantly. When regarding the flux control ratios (FCR, related to maximal respiratory capacity), we confirmed that cells submitted to 2 h of A/R need to function more to keep stable their energetic state (increase of the part of their maximal respiratory capacity used for oxidative phosphorylation because of a lesser efficiency). Inflammatory model Equine neutrophils activation in whole blood All the activation systems used, 12-phorbol 13-myristate acetate (PMA), cytochalasin B with N-formyl-methionyl-leucyl-phenylalanine (CB/fMLP), tumor necrosis factor-alpha (TNF- α), lipopolysaccharides (LPS) and LPS with TNF-α, induced a significant degranulation of total MPO by the PMNs activated in whole blood. Only the combinations CB/fMLP and LPS/TNF-α caused a significant release of active MPO. For the release of ELT by activated PMNs, only the action of the PMA was significant. Use of purified active equine MPO Initially, we showed that MPO incubated with equine skeletal muscle cells was able to bind to the cell membranes, but furthermore, thanks to the differential centrifugation protocol, that we demonstrated that it was able to enter within the cells, because we found it in the cytosolic fraction. Our following experiences showed that it was able, even alone, to increase the ROS produced by the cells, as demonstrated by fluorescence and gas chromatography. Furthermore, MPO worked harder than Horseradish peroxidase (HRP), our "peroxidasic control". The MPO seemed also to alter the mitochondrial respiratory function of cultured cells. Anyway, thanks to the oxygraphic PCP protocol, we showed that MPO alone decreased mostly their routine respiration and their maximal respiratory capacity. Paradoxically, we seen that it increased the part of the maximal respiratory capacity used for routine and non phosphorylating respirations. The second oxygraphic protocol, designed on permeabilized cells, seems to confirm these observations. Compared to control cells, the MPO-treated cells had a increased non phosphorylating respiration and a decreased maximal respiratory capacity, particularly via the mitochondrial complex I. Combined model: anoxia/reoxygenation in inflammatory conditions With fluorescence spectroscopy as well as with gas chromatography, the MPO amplifies the ROS production already increased with the A/R alone. Furthermore, with a 3,3-diaminobenzidine (DAB) coloration, we showed the persistence of the MPO (and of the HRP), within the cells, even after 2 h of A/R. The oxygraphic PCP protocol confirms that MPO seems to exacerbate the damage initiated by A/R. Thus, compared to what we observed with A/R alone, the addition of MPO causes a further decrease of the routine respiration and the maximal respiratory capacity of the cells and increases their non phosphorylating respiration. These observations, along the lines of an important mitochondrial dysfunction, were confirmed when regarding the FCR. Thus, MPO-treated cells, submitted to A/R need to use a greater part of their maximal respiratory capacity for routine respiration, but a greater part of it was also used for non efficient respiration. So, these cells need to work more intensely to keep stable their energetic state, what is reflected in our protocol by an increased part of the maximal respiratory capacity used for oxidative phosphorylation compared to what we observed after A/R alone. Conclusion and perspectives During intense exercise, some physiopathological conditions, inducing important mitochondrial and energetic alterations, seem to gather within the muscle of sport horses. As showed by our work, because of its implication in the mitochondrial regulation at the respiratory level as well as for RNOS production, and of its particular sensibility to nitration, the mitochondrial complex I could play a pivotal role. Although our results clearly indicate that MPO, by exacerbating the deleterious effects of A/R, is detrimental to cellular and mitochondrial functions, further precisions are needed to confirm the specific implication of mitochondrial complex I in the observed phenomena. The results obtained by our group in vivo on competing horses lead the way in this direction but, the adaptation of the oxygraphic protocol on permeabilized cells, combining A/R with the action of MPO, will help to confirm, in vitro, the hypothesis. On another way, the effect of nitration or nitrosation on the mitochondrial complex I will need to be further investigated. Finally, to consider in a largest way the action of the PMNs on the mitochondrial function, it will be interesting to use the whole blood model of PMNs activation in co-culture with equine skeletal myoblasts. By this way, the action of other inflammatory factors or mediators could be studied in conditions nearly to the ones observed in vivo. [less ▲]

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See detailLa fonction neuroendocrine du thymus
Geenen, Vincent ULg

Conference given outside the academic context (1986)

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See detailLa fonction neuroendocrinienne du thymus
Geenen, Vincent ULg

in Revue Médicale de Liège (1986), XLI

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