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See detailDissolved inorganic carbon dynamics in the waters surrounding forested mangroves of the Ca Mau Province (Vietnam)
Koné, J. M.; Borges, Alberto ULg

in Estuarine Coastal & Shelf Science (2008), 7(3), 409-421

Dissolved inorganic carbon (DIC) and ancillary data were obtained during the dry and rainy seasons in the waters surrounding two 10-yearold forested mangrove sites (Tam Giang and Kieˆn Va`ng) located in ... [more ▼]

Dissolved inorganic carbon (DIC) and ancillary data were obtained during the dry and rainy seasons in the waters surrounding two 10-yearold forested mangrove sites (Tam Giang and Kieˆn Va`ng) located in the Ca Mau Province (South-West Vietnam). During both seasons, the spatial variations of partial pressure of CO2 (pCO2) were marked, with values ranging from 704 ppm to 11481 ppm during the dry season, and from 1209 ppm to 8136 ppm during the rainy season. During both seasons, DIC, pCO2, total alkalinity (TAlk) and oxygen saturation levels (%O2) were correlated with salinity in the mangrove creeks suggesting that a combination of lower water volume and longer residence time (leading to an increase in salinity due to evaporation) enhanced the enrichment in DIC, pCO2 and TAlk, and an impoverishment in O2. The low O2 and high DIC and pCO2 values suggest that heterotrophic processes in the water column and sediments controlled these variables. The latter processes were meaningful since the high DIC and TAlk values in the creek waters were related to some extent to the influx of pore waters, consistent with previous observations. This was confirmed by the stochiometric relationship between TAlk and DIC that shows that anaerobic processes control these variables, although this approach did not allow identifying unambiguously the dominant diagenetic carbon degradation pathway. During the rainy season, dilution led to significant decreases of salinity, TAlk and DIC in both mangrove creeks and adjacent main channels. In the Kieˆn Va`ng mangrove creeks a distinct increase of pCO2 and decrease of %O2 were observed. The increase of TSM suggested enhanced inputs of organic matter probably from land surrounding the mangrove creeks, that could have led to higher benthic and water column heterotrophy. However, the flushing of water enriched in dissolved CO2 originating from soil respiration and impoverished in O2 could also have explained to some extent the patterns observed during the rainy season. Seasonal variations of pCO2 were more pronounced in the Kieˆn Va`ng mangrove creeks than in the Tam Giang mangrove creeks. The airewater CO2 fluxes were 5 times higher during the rainy season than during the dry season in the Kieˆn Va`ng mangrove creeks. In the Tam Giang mangrove creeks, the airewater CO2 fluxes were similar during both seasons. The airewater CO2 fluxes ranged from 27.1 mmol C m 2 d 1 to 141.5 mmol C m 2 d 1 during the dry season, and from 81.3 mmol m 2 d 1 to 154.7 mmol m 2 d 1 during the rainy season. These values are within the range of values previously reported in other mangrove creeks and confirm that the emission of CO2 from waters surrounding mangrove forests are meaningful for the carbon budgets of mangrove forests. [less ▲]

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See detailDissolved primary production and heterotrophic prokaryote reassimilation in a large oligotrophic tropical lake (Lake Kivu, Eastern Africa)
Morana, Cédric; Sarmento, Hugo; Bouillon, Steven et al

Conference (2012, July 11)

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See detailDissonance cognitive en contexte postcolonial africain: contradictions dans les valeurs et normes juridiques de succession
Bomda, Joseph ULg; Vaidis, David

Conference (2012, July)

La communication fait suite à la doléance de Leon Festinger de voir les recherches psychosociologiques sur la dissonance cognitive sortir des laboratoires pour aller au contact du réel dans le monde réel ... [more ▼]

La communication fait suite à la doléance de Leon Festinger de voir les recherches psychosociologiques sur la dissonance cognitive sortir des laboratoires pour aller au contact du réel dans le monde réel. (Festinger, 1999). Le cas des conflits de normes successorales (tradition vs. modernité) en rapport avec la veuve et la jeune fille dans le contexte postcolonial camerounais est considéré. L’existence d’un processus de dissonance (vécu et gestion) différencié est postulée. Cependant, il diffère selon l’état matrimonial des parents et l’âge des victimes. Trois-cent-quatre-vingt-deux camerounaises victimes du conflit de normes successorales entre la tradition et la modernité ont rendu compte de leur vécu et de la gestion psychologiques de ce vécu. Un questionnaire d’affects et de stratégies de gestion auto-rapportés a été utilisé à cet effet. Les résultats confirment l’influence de l’état matrimonial des parents et de l’âge des enfants filles comme des facteurs étiologique et de vulnérabilité à la dissonance cognitive. [less ▲]

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See detailDissuasion française et Pesdc
Dumoulin, André ULg

in Sébastien Boussois, Christophe Wasinski (Ed.) Armement et désarmement nucléaires. Perspectives euro-atlantiques (2011)

Cette contribution à un ouvrage collectif reprenant les actes d'un colloque international intitulé "L'Alliance atlantique et l'Europe au défi de l'armement et du désarmement nucléaires" et organisé ... [more ▼]

Cette contribution à un ouvrage collectif reprenant les actes d'un colloque international intitulé "L'Alliance atlantique et l'Europe au défi de l'armement et du désarmement nucléaires" et organisé conjointement par l'ULB et l'Université de Montréal le 30 avril 2010. [less ▲]

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See detailLa dissuasion nucléaire du futur
Dumoulin, André ULg

in Défense et sécurité internationale hors série (2012), 23(23),

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See detailLa dissuasion nucléaire en mutation
Dumoulin, André ULg

Book published by GRIP (1996)

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See detailDissuasion nucléaire et Europe. Entre zones grises et zones floues
Dumoulin, André ULg

in Défense et sécurité internationale (2009)

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See detailLa dissuasion nucléaire française : paramètres doctrinaux, politiques et techniques. Révolution ou inflexion de la stratégie en post-guerre froide (1990-2006) ?
Dumoulin, André ULg

Report (2006)

Ce rapport édité par le Département de science économique de l'Ecole royale militaire (Bruxelles) analyse l'évolution de la stratégie nucléaire française entre 1990 et 2006 du point de vue doctrinal ... [more ▼]

Ce rapport édité par le Département de science économique de l'Ecole royale militaire (Bruxelles) analyse l'évolution de la stratégie nucléaire française entre 1990 et 2006 du point de vue doctrinal, politique et idéologique. [less ▲]

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See detailLa dissuasion. Histoire du nucléaire militaire français
Dumoulin, André ULg

in Histoire & Stratégie (2012), (10),

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See detailDistal ERBB2 promoter fragment displays specific transcriptional and nuclear binding activities in ERBB2 overexpressing breast cancer cells
Delacroix, Laurence ULg; Begon, Dominique ULg; Chatel, Guillaume et al

in DNA & Cell Biology (2005), 24(9), 582-594

Overexpression of the ERBB2 gene occurs in 30% of human breast cancers and is correlated with poor prognosis. The deregulation is the consequence of an increased transcription level and gene amplification ... [more ▼]

Overexpression of the ERBB2 gene occurs in 30% of human breast cancers and is correlated with poor prognosis. The deregulation is the consequence of an increased transcription level and gene amplification. Several laboratories, including our own, have identified, in the proximal promoter, enhancers implicated in the gene overexpression. However, our previous studies of a 6-kb ERBB2 promoter fragment revealed the presence of repressing fragments, which were able to overcome the effect of the proximal enhancers. These repressing elements were functional in all cell lines, regardless of their endogenous ERBB2 expression level. Here, we show that a distal ERBB2 promoter region restores high transcription rates specifically in ERBB2 overexpressing breast cancer cells. This distal promoter region thus contains enhancers essential for the overexpression of the gene. By EMSA, performed with nuclear extract of cells overexpressing (BT-474) or not (MDA-MB-231) the ERBB2 gene, we show that at least two sequences of the distal promoter region are bound exclusively by BT-474 extract. Further experiments reveal that AP-2 transcription factors contribute to this differential binding activity, by binding recognition sequences located 4500 bp and 4000 bp upstream of the transcription start site. These sites are occupied by AP2 in vivo, as demonstrated by ChIP assay. Inactivation of AP-2 proteins in ERBB2 overexpressing cells reduces the distal promoter activity up to 70%, indicating the AP-2 factors are implicated in the strong distal enhancing effect. Moreover, we identified a 54-bp fragment that is bound specifically by BT-474 nuclear extract. Further experiments did not lead to the identification of the protein responsible for this binding. Our results thus highlight the importance of ERBB2 distal promoter region and further implicate AP-2 in ERBB2 overexpression in breast cancer cells. [less ▲]

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See detailDistance and location processes in memory for time : An update
Bastin, Christine ULg; Friedman, William J.

Conference (2004)

Memory for times of past events depends on direct impressions of the temporal “distances” of the events in the past and the reconstruction of temporal “locations. Two studies shed light on the possible ... [more ▼]

Memory for times of past events depends on direct impressions of the temporal “distances” of the events in the past and the reconstruction of temporal “locations. Two studies shed light on the possible neurological basis of location-based processes. In an ERP study, adults performed tasks thought to bias subjects to use distance or location processes. Late frontal activity was specifically linked to location-based processes. In another study using the same tasks, aging was found to disrupt location-based processes more than distance-based processes. Age-related differences in the use of location-based processes were mediated by speed of processing and by working-memory capacities. [less ▲]

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See detailDistance and location processes in memory for time: An update
Bastin, Christine ULg; Friedman, William J.

in Proceedings of the 28th International Congress of Psychology (2005)

Memory for times of past events depends on direct impressions of the temporal “distances” of the events in the past and the reconstruction of temporal “locations. Two studies shed light on the possible ... [more ▼]

Memory for times of past events depends on direct impressions of the temporal “distances” of the events in the past and the reconstruction of temporal “locations. Two studies shed light on the possible neurological basis of location-based processes. In an ERP study, adults performed tasks thought to bias subjects to use distance or location processes. Late frontal activity was specifically linked to location-based processes. In another study using the same tasks, aging was found to disrupt location-based processes more than distance-based processes. Age-related differences in the use of location-based processes were mediated by speed of processing and by working-memory capacities. [less ▲]

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See detailDistance correlations and dynamics of liquid GeSe: An ab initio molecular dynamics study
Raty, Jean-Yves ULg; Godlevsky, V. V.; Gaspard, Jean-Pierre ULg et al

in Physical Review. B, Condensed Matter and Materials Physics (2001), 64

We analyze the structure and dynamics of semiconducting liquid GeSe using ab initio molecular-dynamics simulations. We show the local order of the liquid to be close to that of the low-temperature ... [more ▼]

We analyze the structure and dynamics of semiconducting liquid GeSe using ab initio molecular-dynamics simulations. We show the local order of the liquid to be close to that of the low-temperature crystalline phase. alpha -GeSe. In particular, we show that the Peierls distortion, which defines the a phase and vanishes in the high-temperature beta crystalline phase, reenters GeSe in the melt. Examining the distance histograms allows one to analyze the Ge environment as consisting of a Gese(3) unit and having one Ge-Ge defective bond. Evidence is presented that Peierls distortion is directly responsible for the semiconducting behavior of the melt. The calculated viscosity and electrical conductivity are in agreement with the experiment. An additional neutron-diffraction experiment indicates that this liquid structure is unmodified 200 K above the melting point. [less ▲]

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See detailDistance intertextuelle et classement des textes d'après leur structure : méthodes de découpage et analyses arborées
Longrée, Dominique ULg; Mellet, Sylvie; Luong, Xuan

in Viprey, Jean-Marie; Condé, Claude; Lelu, A. (Eds.) et al JADT 2006, 8èmes Journées internationales d’Analyse statistique des Données Textuelles (2006)

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See detailDistance learning and education for diabetes care
Leclercq, Dieudonné ULg; Lefèbvre, Pierre ULg

in Journal of the Diabetic Association of India (1997, July), 37(3), 71-76

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See detailDistant activity of comet C/2006 W3 (Christensen) as observed with Herschel
de Val-Borro, M.; Bockelée-Morvan, D.; Jehin, Emmanuel ULg et al

in Muinonen, Karri (Ed.) Asteroids, Comets, Meteors - Book of Abstracts (2014, July 01)

We aimed to measure the H_2O and dust production rates in C/2006 W3 (Christensen) with the Herschel Space Observatory at a heliocentric distance of ˜ 5 au and compare these data with previous post ... [more ▼]

We aimed to measure the H_2O and dust production rates in C/2006 W3 (Christensen) with the Herschel Space Observatory at a heliocentric distance of ˜ 5 au and compare these data with previous post-perihelion Herschel and ground-based observations at ˜ 3.3 au from the Sun (Bockelée-Morvan et al. 2010b). We have searched for emission in the H_2O and NH_3 ground-state rotational transitions at 557 GHz and 572 GHz, simultaneously, toward comet C/2006 W3 (Christensen) with the Heterodyne Instrument for the Far Infrared (HIFI) onboard Herschel on UT 1.5 September 2010. Photometric observations of the dust coma in the 70 μ m to 160 μ m channels were acquired with the Photodetector Array Camera and Spectrometer (PACS) instrument on UT 26.5 August 2010. A tentative 4-σ H_2O line emission feature was found in the spectra obtained with the HIFI wide-band and high-resolution spectrometers, from which we derive a water production rate of 2.0(5)×10^{27} molec. s^{-1}. A 3-σ upper limit for the ammonia production rate of < 1.5×10^{27} molec. s^{-1} is obtained taking into account the contribution from all hyperfine components (Biver et al. 2012). The dust thermal emission was detected in the 70-μ m to 160-μ m filters, with a more extended emission in the blue channel. We fit the radial dependence of the surface brightness with radially symmetric profiles for the blue and red bands. The dust production rates, obtained for a dust size distribution index that explains the fluxes at the photocenters of the PACS images, lie in the range 70-110 kg s^{-1}. Scaling the CO production rate measured post-perihelion at 3.20-3.32 au, these values correspond to a dust-to-gas production rate ratio in the range 0.3-0.4. The blueshift of the water line detected by HIFI suggests preferential emission from the subsolar point. However, it is also possible that water sublimation occurs in small ice-bearing grains that are emitted from an active region on the nucleus surface at a speed of ˜ 0.2 km s^{-1}. The dust production rates derived in August 2010 are roughly one order of magnitude lower than in September 2009, suggesting that the dust-to-gas production rate ratio remained approximately constant during the period when the activity became increasingly dominated by CO outgassing. These data will complement available Herschel observations of the distant activity of other comets such as 29P/Schwassmann-Wachmann 1 (Bockelée-Morvan et al. 2010a) and main-belt comets 176P/LINEAR and P/2012 T1 (PANSTARRS) (de Val-Borro et al. 2012, O'Rourke et al. 2013). [less ▲]

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See detailDistant and new mutations in CTX-M-1 beta-lactamase affect cefotaxime hydrolysis.
Perez-Llarena, Francisco J; Kerff, Frédéric ULg; Abian, Olga et al

in Antimicrobial Agents and Chemotherapy (2011), 55(9), 4361-8

The CTX-M beta-lactamases are an increasingly prevalent group of extended-spectrum beta-lactamases (ESBL). Point mutations in CTX-M beta-lactamases are considered critical for enhanced hydrolysis of ... [more ▼]

The CTX-M beta-lactamases are an increasingly prevalent group of extended-spectrum beta-lactamases (ESBL). Point mutations in CTX-M beta-lactamases are considered critical for enhanced hydrolysis of cefotaxime. In order to clarify the structural determinants of the activity against cefotaxime in CTX-M beta-lactamases, screening for random mutations was carried out to search for decreased activity against cefotaxime, with the CTX-M-1 gene as a model. Thirteen single mutants with a considerable reduction in cefotaxime MICs were selected for biochemical and stability studies. The 13 mutated genes of the CTX-M-1 beta-lactamase were expressed, and the proteins were purified for kinetic studies against cephalothin and cefotaxime (as the main antibiotics). Some of the positions, such as Val103Asp, Asn104Asp, Asn106Lys, and Pro107Ser, are located in the (103)VNYN(106) loop, which had been described as important in cefotaxime hydrolysis, although this has not been experimentally confirmed. There are four mutations located close to catalytic residues-Thr71Ile, Met135Ile, Arg164His, and Asn244Asp-that may affect the positioning of these residues. We show here that some distant mutations, such as Ala219Val, are critical for cefotaxime hydrolysis and highlight the role of this loop at the top of the active site. Other distant substitutions, such as Val80Ala, Arg191, Ala247Ser, and Val260Leu, are in hydrophobic cores and may affect the dynamics and flexibility of the enzyme. We describe here, in conclusion, new residues involved in cefotaxime hydrolysis in CTX-M beta-lactamases, five of which are in positions distant from the catalytic center. [less ▲]

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