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See detailOrientation And Effects Of Mastoparan X On Phospholipid Bicelles
Whiles, Ja.; Brasseur, Robert ULg; Glover, Kj. et al

in Biophysical Journal (2001), 80(1), 280-93

Mastoparan X (MPX: INWKGIAAMAKKLL-NH2) belongs to a family of ionophoric peptides found in wasp venom. Upon binding to the membrane, MPX increases the cell's permeability to cations leading to a ... [more ▼]

Mastoparan X (MPX: INWKGIAAMAKKLL-NH2) belongs to a family of ionophoric peptides found in wasp venom. Upon binding to the membrane, MPX increases the cell's permeability to cations leading to a disruption in the electrolyte balance and cell lysis. This process is thought to occur either through a membrane-thinning mechanism, where the peptide resides on the membrane surface thereby disrupting lipid packing, or through formation of an oligomeric pore. To address this issue, we have used both high-resolution and solid-state 2H NMR techniques to study the structure and orientation of MPX when associated with bicelles. NOESY and chemical shift analysis showed that in bicelles, MPX formed a well-structured amphipathic alpha-helix. In zwitterionic bicelles, the helical axis was found to rest generally perpendicular to the membrane normal, which could be consistent with the "carpet" mechanism for lytic activity. In anionic bicelles, on the other hand, the helical axis was generally parallel to the membrane normal, which is more consistent with the pore model for lytic activity. In addition, MPX caused significant disruption in lipid packing of the negatively charged phospholipids. Taken together, these results show that MPX associates differently with zwitterionic membranes, where it rests parallel to the surface, compared with negatively charged membranes, where it penetrates longitudinally. [less ▲]

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See detailOrientation and Order of Self-Assembled p-Benzenedimethanethiol Films on Pt(111) Obtained by Direct Adsorption and via Alkanethiol Displacement
Silien, Christophe; Dreesen, Laurent ULg; Cecchet, Francesca et al

in Journal of Physical Chemistry C: Nanomaterials, Interfaces, and Hard Matter (2007), 111

Self-assembly of p-benzenedimethanethiol (p-BDMT) on Pt(111) has been investigated by high-resolution electron energy loss spectroscopy and sum-frequency generation spectroscopy. The molecules adsorb on ... [more ▼]

Self-assembly of p-benzenedimethanethiol (p-BDMT) on Pt(111) has been investigated by high-resolution electron energy loss spectroscopy and sum-frequency generation spectroscopy. The molecules adsorb on Pt-(111) like on gold, attached through one single thiol, leaving the second thiol moiety unreacted and exposed to the outer surface. Yet, the order of the p-BDMT self-assembled film is poor in comparison to alkanethiol SAMs. Displacement in solution of a preadsorbed pentanethiol (PTT) SAM by p-BDMT molecules proved to be a successful approach to achieve films of higher quality, where the size of the dithiol molecular domains tends toward the size measured for PTT. Nearly complete exchange is accomplished after 42 h. However, no significant exchange is observed when dodecanethiol replaces PTT. Displacing the alkanethiols by benzenethiol leads to the same conclusions, suggesting that the exchange processes are lessened as compared to gold. [less ▲]

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See detailOrientation and structure of different components in the tail of comet West /1975n/
Surdej, Jean ULg; Surdej, Anna ULg

in Astronomy and Astrophysics (1977), 57

The orientation and structure of various components in the tail of comet West are studied from plates obtained March 4-11, 1976, with a 60-cm Schmidt telescope. A wavelike structure appears on March 10 ... [more ▼]

The orientation and structure of various components in the tail of comet West are studied from plates obtained March 4-11, 1976, with a 60-cm Schmidt telescope. A wavelike structure appears on March 10 and 11 in the type I tail. The mechanism for these waves is very probably excitation of surface waves in the ion tail due to Kelvin-Helmholtz instability at the interface between the comet plasma and the solar wind. According to this model, the measured wavelengths increase with distance from the comet head. The average wavelength of observed waves is 0.009 plus or - 0.002 AU. [less ▲]

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See detailOrientation des objectifs et participation à des activités sportives
Ledent, Maryse; Telama, Risto; Cloes, Marc ULg et al

in Sport (1997), 159/160

Il existe une multitude de facteurs d'influence qui rendent la prévision d'une participation à l'activité sportive particulièrement délicate: influences biologiques et démographiques, psychologiques ... [more ▼]

Il existe une multitude de facteurs d'influence qui rendent la prévision d'une participation à l'activité sportive particulièrement délicate: influences biologiques et démographiques, psychologiques, sociales et environnementales. ... [less ▲]

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See detailL'orientation du jeune : Quels constats ? Quels cadres ? Quelles interventions
Donnay, Jean; Biémar, Sandrine; Boucenna, S. et al

Learning material (2002)

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See detailOrientation et facteurs interculturels
Broonen, Jean-Paul ULg

in Van Esbroeck, Raoul; Butcher, Val; Aungier, Colette (Eds.) et al Proceedings of the FEDORA Summer School: Successful adjustment to university and progression beyond in a European context (1996)

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See detailOrientation et facteurs interculturels
Broonen, Jean-Paul ULg

in Van Esbroeck, R.; Butcher, V.; Aungier, C. (Eds.) et al Successful adjustment to university and progression beyond in a European context - Summer School - Proceedings (1996)

Beyond general skills of counseling, high multicultural competent counselor must extend his/her informative network and "social consciousness" to client's cultural variables; increase his/her self ... [more ▼]

Beyond general skills of counseling, high multicultural competent counselor must extend his/her informative network and "social consciousness" to client's cultural variables; increase his/her self-consciousness in the cultural field; increase his/her flexibility in the cognitive and emotional domains. [less ▲]

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See detailOrientation of Thiophenol Adsorbed on Silver Determined by Nonlinear Vibrational Spectroscopy of the Carbon Skeleton
Mani, A. A.; Schultz, Z. D.; Caudano, Y. et al

in Journal of Physical Chemistry B (2004), 108

The orientation of thiophenol adsorbed on silver is determined by comparing ab initio calculated and experimental sum-frequency generation (SFG) spectra measured between 9 and 20 µm using a tandem KTP ... [more ▼]

The orientation of thiophenol adsorbed on silver is determined by comparing ab initio calculated and experimental sum-frequency generation (SFG) spectra measured between 9 and 20 µm using a tandem KTP/CdSe optical parametric oscillator. The molecule S-C bond is tilted ~37° from the surface normal with the aromatic ring plane perpendicular to the surface. [less ▲]

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See detailL'orientation scolaire en Communauté française de Belgique
Demeuse, Marc ULg; Lafontaine, Dominique ULg

in Revue Internationale d'Education (2005), 38

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See detailL'orientation scolaire. Héritages sociaux et jugements professoraux
Andre, Géraldine ULg

Book published by Presses Universitaires de France - 1ère éd. (2012)

Pourquoi, au sein de sociétés démocratiques et de systèmes éducatifs ouverts, les jeunes de milieux populaires se retrouvent-ils souvent dans des filières et des formes d’enseignement peu valorisées dans ... [more ▼]

Pourquoi, au sein de sociétés démocratiques et de systèmes éducatifs ouverts, les jeunes de milieux populaires se retrouvent-ils souvent dans des filières et des formes d’enseignement peu valorisées dans la hiérarchie scolaire ? À partir d’une enquête qualitative de longue durée, cet ouvrage propose une relecture de la sociologie de l’éducation en confrontant les interprétations de l’orientation à un corpus empirique inédit. Une immersion prolongée dans les familles, les lieux de sociabilité d’élèves de l’enseignement professionnel, les séances d’orientation et les conseils de classe donne à ce livre l’épaisseur ethnographique nécessaire pour saisir les réalités scolaires. Au-delà des processus de relégation, cet ouvrage donne à voir les pratiques et les représentations des acteurs qui façonnent les trajectoires. En choisissant une région postindustrielle comme principal terrain d’enquête, c’est aussi la question de la transformation des classes sociales qui est posée. Les cultures de classe demeurent-elles le facteur clé pour expliquer les mécanismes de l’orientation ? L’analyse du processus d’orientation vers l’enseignement de type professionnel nous plonge ainsi dans un débat plus vaste sur la reproduction culturelle et le changement social. [less ▲]

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See detailL'orientation structurale de la linguistique au XVIIIe siècle
Droixhe, Daniel ULg

in Français Moderne (Le) (1970), 38

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See detailThe orientation within the Galaxy and the Large Magellanic Cloud of nebulae ejected by massive stars
Hutsemekers, Damien ULg

in Astronomy and Astrophysics (1999), 344

The orientation of nebulae ejected by massive stars (Luminous Blue Variables, WR stars, SN1987A) is investigated with respect to the structure of the galaxy to which they belong. In the Galaxy, we find ... [more ▼]

The orientation of nebulae ejected by massive stars (Luminous Blue Variables, WR stars, SN1987A) is investigated with respect to the structure of the galaxy to which they belong. In the Galaxy, we find that the projected long axes of the nebulae most often align with the galactic plane, and then also with the galactic magnetic field. This alignment is statistically significant. In addition, a few nebulae are apparently oriented perpendicular to the galactic plane. In the Large Magellanic Cloud, the nebular axes are found to closely follow the spiral magnetic field. With different inclinations, the Galaxy and the Large Magellanic Cloud probably offer complementary views of the same phenomenon. Although the sample studied thus far is small and the statistics limited, these results suggest that the orientation of massive star ejecta depends on galactic magnetic fields. Since the nebular axes are apparently correlated to the symmetry axes of the stars themselves, and since, in the early evolutionary stages, alignments of accretion disk axes with the interstellar magnetic field have been reported, it is argued that the observed alignment effect results from the star formation process. Based in part on observations collected at the European Southern Observatory (ESO, La Silla) [less ▲]

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See detailOrientations diagnostiques chez le voyageur au retour d'un pays exotique
Pierard, Gérald ULg

in Revue Médicale de Liège (2000), 55(6), 490-1

On a medical ground, a traveller returning from an exotic country may suffer from three main categories of diseases: fever, diarrhoea and unusual dermatosis. The present review is a synoptic aid at the ... [more ▼]

On a medical ground, a traveller returning from an exotic country may suffer from three main categories of diseases: fever, diarrhoea and unusual dermatosis. The present review is a synoptic aid at the diagnosis. [less ▲]

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See detailOrientations méthodologiques d’une recherche sur le genre et les espaces publics au travers de l’analyse socio-anthropologique des mobilisations pour la cause des femmes à Lubumbashi (RDCongo)
Grenade, Sophie ULg

in Yepez del Castillo, Isabel; Charlier, Sophie; Grenade, Sophie (Eds.) Les recherches en genre et développement pour des politiques de développement appropriées (2009)

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See detailLes orientations stratégiques de la Coopération Universitaire au Développement
Marchal, Jean ULg

(2002, November 28)

Chargée, dès 1997, à préparer et à mettre en œuvre les responsabilités nouvelles des universités francophones de Belgique dans le cadre de la coopération universitaire au développement, la C.U.D. n’a ... [more ▼]

Chargée, dès 1997, à préparer et à mettre en œuvre les responsabilités nouvelles des universités francophones de Belgique dans le cadre de la coopération universitaire au développement, la C.U.D. n’a cessé d’identifier, de définir, d’adapter, d’affiner ses orientations stratégiques. Ce processus a été celui d’un apprentissage continu : de nombreuses évaluations internes à la C.U.D., et à ses groupes de travail, une concertation continue avec les autorités publiques, le relais des institutions universitaires du sud, ont permis à la C.U.D. de consolider, tout au long de l’actuel plan quinquennal 1998-2002, les orientations stratégiques qui guident ses programmes et qui constitueront la base des travaux du prochain plan quinquennal. Dans la présente contribution, sont décrites très brièvement les principales orientations stratégiques qui servent de lignes directrices à la C.U.D. [less ▲]

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See detailLes orifices branchiaux externes des Ascidiens et la formation du cloaque chez Phallusia scabroïdes, nov. Sp.
Van Beneden, Édouard ULg; Julin, Charles

in Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique (1884), 8(7), 631-646

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See detailOrigin and distribution of Calvin cycle fructose and sedoheptulose bisphosphatases in Plantae and complex algae: A single secondary origin of complex red plastids and subsequent propagation via tertiary endosymbioses
Teich, René; Zauner, Stefan; Baurain, Denis ULg et al

in Protist (2007), 158(3), 263-276

Sedoheptulose-1,7-bisphosphatase (SBPase) and fructose-1,6-bisphosphatase (FBPase) are essential nuclear-encoded enzymes involved in land plant Calvin cycle and gluconeogenesis. In this study, we cloned ... [more ▼]

Sedoheptulose-1,7-bisphosphatase (SBPase) and fructose-1,6-bisphosphatase (FBPase) are essential nuclear-encoded enzymes involved in land plant Calvin cycle and gluconeogenesis. In this study, we cloned seven SBP and seven FBP cDNAs/genes and established sequences from all lineages of photosynthetic eukaryotes, in order to investigate their origin and evolution. Our data are best explained by a single recruitment of plastid-targeted SBP in Plantae after primary endosymbiosis and a further distribution to algae with complex plastids. While SBP is universally found in photosynthetic lineages, its presence in apicomplexa, ciliates, trypanosomes, and ascomycetes is surprising given that no metabolic function beyond the one in the plastid Calvin cycle is described so far. Sequences of haptophytes, cryptophytes, diatoms, and peridinin-containing dinoflagellates (complex red lineage) strongly group together in the SBP tree and the same assemblage is recovered for plastid-targeted FBP sequences, although this is less supported. Both SBP and plastid-targeted FBP are most likely of red algal origin. Including phosphoribulokinase, fructose bisphosphate aldolase, and glyceraldehyde-3-phosphate dehydrogenase, a total of five independent plastid-related nuclear-encoded markers support a common origin of all complex rhodoplasts via a single secondary endosymbiosis event. However, plastid phylogenies are incongruent with those of the host cell, as illustrated by the cytosolic FBP isoenzyme. These results are discussed in the context of Cavalier-Smith's far-reaching chromalveolate hypothesis. In our opinion, a more plausible evolutionary scenario would be the establishment of a unique secondary rhodoplast and its subsequent spread via tertiary endosymbioses. (c) 2007 Elsevier GmbH. All rights reserved. [less ▲]

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See detailOrigin and early evolution of life
Javaux, Emmanuelle ULg

Conference (2009)

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See detailOrigin and evolution of Dorlodotia (Rugosa)
Denayer, Julien ULg; Poty, Edouard

in Kölner Forum für Geologie und Paläontologie (2011), 19

Detailed reference viewed: 22 (4 ULg)