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See detail17-O-Actetyl-10-hydroxycorynantheol, a selective antiplasmodial alkaloid isolated from Strychnos usambarensis leaves
Cao, Martine ULg; Muganga, Raymond ULg; Tits, Monique ULg et al

Conference (2011, December 13)

In the course of our investigations on Strychnos usambarensis leaves in order to isolate isostrychnopentamine, the main alkaloid responsible for the antiplasmodial activity of the plant, a new tertiary ... [more ▼]

In the course of our investigations on Strychnos usambarensis leaves in order to isolate isostrychnopentamine, the main alkaloid responsible for the antiplasmodial activity of the plant, a new tertiary indolic alkaloid has been isolated: 17-O-acetyl, 10-hydroxycorynantheol 1. Its structure was determined by means of spectroscopic and spectrometric methods such as UV, IR, CD, NMR and ESI-MS. 17-O-acetyl, 10-hydroxycorynantheol 1 is one of the most active monomeric indole alkaloid known to date showing an in vitro activity against Plasmodium falciparum close to 5 µM and a high selectivity. [less ▲]

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See detailHTA résistante et cible tensionnelle chez le diabétique
Krzesinski, Jean-Marie ULg

Conference (2011, December 13)

Detailed reference viewed: 11 (0 ULg)
See detailMarx et la division du travail
Pieron, Julien ULg

Conference given outside the academic context (2011)

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See detail"Les langues: le coeur et la raison"
Defays, Jean-Marc ULg

Conference (2011, December 12)

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See detailFonctions visuo-perceptives et spatiales chez les enfants IMC
Schmetz, Emilie ULg; Detraux, Jean-Jacques ULg

Poster (2011, December 12)

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See detailBeef cattle systems in the context of sustainable agriculture in Bac Kan province, the Northern Mountainous Region of Vietnam
Hoang, Thi Huong Tra ULg

Doctoral thesis (2011)

Among livestock types, beef cattle production is ranked as a very important sub-sector in the extremely harsh natural conditions characterising the northern uplands of Vietnam, where ethnic minorities are ... [more ▼]

Among livestock types, beef cattle production is ranked as a very important sub-sector in the extremely harsh natural conditions characterising the northern uplands of Vietnam, where ethnic minorities are often concentrated on land resources which are not hospitable to crops. To help local people to escape from poverty, many organisations have initiated development projects featuring beef cattle production, but it still remains under-developed, hence the generally high level of poverty faced by farmers. <br /> <br />Thus, the study aims to assess the characteristics and appropriateness of beef cattle feeding systems, which are compared from the point of view of sustainability. <br /> <br />Stratified sampling was used to select 97 households within free-range, part-time grazing, and cut-and-carry feeding systems, which were surveyed in Bac Kan province between 2007 and 2009. The collection of field data was implemented using various survey instruments such as structured questionnaires and interview guides. Data processing consisted in descriptive statistics, correlations between the variables, and the calculation of socio-economic indicators. Based on the sample surveyed, the differences between the three systems of cattle management were highlighted. <br /> <br />Access to grazing land and its topography, the ethnicity of the communities, the relative importance of agricultural and forest production, and opportunities for off-farm employment were all factors influencing the cattle systems. Those using the “cut-and-carry” fodder system are practicing the most efficient husbandry style among the systems from both the social and economic points of view, except for lack of proper management and use of cattle manure. Manure use for cultivation in this system was limited because of the predominantly steep slope lands and the habits of the indigenous peoples. Animal manure utility was evaluated as less important in the cut-and-carry system compared to other systems practiced in the lowlands. <br /> <br />However, good prospects are seen to improve conditions in the rural uplands in the future. Thus, different strategies should be implemented to fill the gap and improve the position of farmers. The study derives helpful recommendations for farmers keeping beef cattle to strongly develop their production, alleviate poverty, and improve their livelihoods. [less ▲]

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See detailCoupure n’est pas renversement. La dialectique marxienne au prisme d’Althusser
Bolmain, Thomas ULg

Scientific conference (2011, December 12)

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See detailauditory sensitivity in birds: sex differences and noise impacts
Noirot, Isabelle ULg

Doctoral thesis (2011)

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See detailIntérêts des traitements symptomatiques anti-arthrosiques
Bruyère, Olivier ULg

Conference (2011, December 12)

Detailed reference viewed: 7 (1 ULg)
See detailExpressions et territoires politico-religieux- le cas des Eglises de Réveil (RDC et diaspora
Demart, Sarah ULg

Scientific conference (2011, December 12)

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See detailRousseau
Herla, Anne ULg

Conference given outside the academic context (2011)

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See detailAstrophysical parameters and multiplicity of massive stars: a mathematical approach
Mahy, Laurent ULg

Doctoral thesis (2011)

Often quoted for their crucial role in the ecology of galaxies, massive stars remain mysterious. The exact process leading to their formation, their stability or their stellar winds are so many questions ... [more ▼]

Often quoted for their crucial role in the ecology of galaxies, massive stars remain mysterious. The exact process leading to their formation, their stability or their stellar winds are so many questions which are still unanswered. Since the lifetime of these objects is too short to allow them to move far away from their birth places, the large majority of massive stars are located in young open clusters or in OB associations. The observations of massive stars in these locations thus provide with promising information on their formation mechanisms. One of the most interesting properties, in this context, is their multiplicity. Indeed, the proportion of multiple systems, the values of orbital periods, of eccentricities, or of mass ratios are parameters directly linked to the formation mechanism and to the dynamical interactions occurring during the earliest stages of their existence. Moreover, constraining this multiplicity with a sufficient accuracy allows to obtain a better determination of the nature and physical parameters of massive stars. The present work is devoted to the study of the O star populations located in the young open cluster NGC2244 and in the surrounding Mon OB2 association as well as in several OB associations of the Cygnus complex. We establish not only the multiplicity of about thirty stars but also their fundamental parameters such as their masses or their N content. However, the complexity of observed spectra of multiple systems makes these objects difficult to investigate. Their analysis thus requires the development and the utilization of mathematical tools such as the "disentangling" which allows to separate the spectra of the components from the observed ones or such as the Doppler tomography which aims at mapping the wind interactions seen in some binary systems. The first part of this dissertation is dedicated to the development and to the characterization of these mathematical methods whilst the second part focuses on the study of populations of massive stars. We refine the orbital and physical parameters of systems already known as multiple. In this context, the analysis of the two components of LZ Cep system reveals modified abundances for the secondary star, confirming a mass transfer from the secondary towards to primary. We also detect for the first time a third star in the HD150136 system. This object, composed of an O3, an O5.5 and an O6.5, constitutes a new test to apply these mathematical methods and thus to better constrain the physical properties of the system as well as those of each component. Moreover, we find, in the population of NGC2244, of Mon OB2 and of the Cygnus OB associations, six new binary systems and derive the orbital solutions for five of them. These results show that NGC2244 hosts only one long-period binary and none with a short period whilst four short-period and no long-period systems are detected in the Cygnus complex. This obvious lack of short-period system in NGC2244 contrasts with the O star populations in other young open clusters such as NGC6231 or IC 2944. Besides the multiplicity, the fundamental parameters such as the N content also allows us to, notably, adapt the so-called Hunter-diagram to galactic O stars. Moreover, we have obtained photometric data for six O-type stars in NGC2244 and Mon OB2 with the CoRoT satellite. These data of unprecedented quality allow us to detect the presence, in the O star light curves, of red noise which is supposed to originate from either the sub-surface convection zone, the granulation or an onset of clumping in the winds of the stars. We also highlight the existence of non-radial pulsations in the light curve of Plaskett’s Star as well as a hot spot located between the two components of that system. In addition, numerous frequencies, extracted from the CoRoT light curves, reveal, for some of the observed stars, solar-like oscillations or beta Cephei-like pulsations. This analysis thus gives a first observational constraint on the bright end of the massive star instability strip. [less ▲]

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Peer Reviewed
See detailSinging the ‘dagong’ via the web: suffering, longings and ideals. An exploration of the everyday politics of migrant labour in South China
Florence, Eric ULg

Conference (2011, December 10)

Since the 1980s, new forms of labour, new subjectivities and attitudes related to the market and to flexible capitalism have been more and more prized in the PRC coexisting with older strands of ... [more ▼]

Since the 1980s, new forms of labour, new subjectivities and attitudes related to the market and to flexible capitalism have been more and more prized in the PRC coexisting with older strands of narratives and cultural productions linked to Mao-era state-socialism. The process of cultural re-invention and of contention around “migrant labour” provides a particularly interesting vintage point in order to delve into the twin dynamics of rural workers’ unstable identification processes (at the individual and collective levels) and at the state project of legitimation. Within this paper, I intend to explore how the new media cultures inform and relate to the cultural politics of migrant labour in today’s China, including the shaping of new subjectivities, by examining rural workers’ use of the internet to narrate both their hometown and their experience of labour. I will look specifically at the everyday politics of rural workers’ practices of “song writing” via the internet and will delve upon the following questions: how does this practice of song writing/listening inform the politics of identity formation among rural labourers? how can one relate rural migrant workers’ song writing to the increasingly “on the ground” organized waves of labour protests in South China? I will argue that the virtual space which this practice provides a useful vintage point in order to examine how state and non-state actors can engage each other and how the Party-state is constantly re-inventing novel ways to shape its system of ideological signs. The datas used for this paper will include songs and poems by rural workers, an extensive analysis by the author of the Shenzhen mainstream written press, participant observation, in-depth interviews, and a large body of unpublished letters to the editor of several migrants’ magazines. [less ▲]

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See detailCASUS 2011 - Droit administratif
Durviaux, Ann-Lawrence ULg

Learning material (2011)

Detailed reference viewed: 55 (7 ULg)
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Peer Reviewed
See detailZoonotic diseases in pet birds -a short review
Boseret, Géraldine ULg

Poster (2011, December 09)

The term « Pet bird » designates birds housed and breeded for an exclusively ornamental use. This category includes mainly Passeriformes (canaries, finches…) and Psittaciformes (parrots, parakeets…), and ... [more ▼]

The term « Pet bird » designates birds housed and breeded for an exclusively ornamental use. This category includes mainly Passeriformes (canaries, finches…) and Psittaciformes (parrots, parakeets…), and is a not-so-well known vet’s clientship fraction. Many families indeed own their « kitchen canary », which represent a lucrative business for pet shops or local breeders (e.a. via birds fairs and markets). Besides, some birds are bred for their very high value; for example, in the case of canaries, male and female reproductors with recognized genetic potential are presented in international contests for their posture (the Bossu Belge : fig 1a), their colour (red mosaic: fig 1b) and for their song (Harzer: fig 1c) and sold for rising prices. Finally, exotic birds like parrots (ara, cockatoo…), legally or illegaly traded from Asia, are however very popular pets and profusely represented in zoos and parks. Notwithstanding these economic facts, these animals are potential carriers and/or transmitters of zoonotic diseases. Some of them could have an important impact on human health, like ornithosis, salmonellosis or even H5N1 high pathogenic avian influenza. This review, although non exhausive, has as aim to enlighten, by the description of several cases of birds-humans transmission the risks encountered by birds owners, including children, and on another point of view to assess the potential economic consequences. [less ▲]

Detailed reference viewed: 33 (6 ULg)
See detailThe future in the present: "entangled temporalities" and religious life in the Kimbanguist church
Melice, Anne ULg; Sarró, Ramon

Conference (2011, December 09)

Detailed reference viewed: 19 (1 ULg)