References of "1997"
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See detailMAVIS STAPLES
Sacré, Robert ULg

in Soul Bag (1997), (145), 75

hoto : Mavis STAPLES , Peer , juillet 1992

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See detailPharma-clinics. Comment je traite ... Une infection par le VIH. II. Inhibiteurs nucléosidiques de la transcriptase reverse
Moutschen, Michel ULg; Nkoghe, D.; Leonard, Philippe ULg et al

in Revue Médicale de Liège (1997), 52(12), 750-2

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See detailAnionic polymerization of methacrylate monomers initiated by lithium dialkylamides
Antoun, Sayed; Teyssié, Philippe; Jérôme, Robert ULg

in Journal of Polymer Science. Part A, Polymer Chemistry (1997), 35(17), 3637-3544

The anionic polymerization of methacrylate monomers has been investigated with lithium dialkylamides as initiators in THF and toluene, respectively. Theoretical arguments and previous studies of mixed ... [more ▼]

The anionic polymerization of methacrylate monomers has been investigated with lithium dialkylamides as initiators in THF and toluene, respectively. Theoretical arguments and previous studies of mixed aggregates of lithiated organic compounds support the complexity of these systems. Lithium diisopropylamide (LDA) shows the highest initiation efficiency (e.g., f = 75% in THF at -78°C). Interestingly enough, lithium chloride has a remarkable beneficial effect on the methacrylates polymerization in THF at -78°C, due to the formation of 1 : 1 mixed dimer with LDA, which promotes a well-controlled anionic polymerization (Mw/Mn = 1.05) with a high initiation efficiency (94%). The less bulky lithium-diethylamide (LDEA) is much less efficient (f = 26%), essentially as a result of some associated dormant species and side reactions on the carbonyl group of MMA. Although various types of ligands have been screened, no remarkable improvement of LDEA efficiency has been observed. Lithium bis(trimethylsilyl)amide (LTMSA) has also been used to increase the steric hindrance of the initiator. This compound is, however, unable to initiate the methacrylates polymerization, more likely because of a too low basicity and a too strong Li - N bond. © 1997 John Wiley [less ▲]

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See detailValidation of a fast voltage stability analysis method on the Hydro-Québec system
Van Cutsem, Thierry ULg; Mailhot, Richard

in IEEE Transactions on Power Systems (1997), 12

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See detailPoly [glycidyl methacrylate (GMA) / methylmethacrylate (MMA)-b-butadiene (B)-b-GMA/MMA] reactive thermoplastic elastomers: synthesis and characterization
Yu, Jian Ming; Dubois, Philippe ULg; Jérôme, Robert ULg

in Journal of Polymer Science. Part A, Polymer Chemistry (1997), 35(16), 3507-3515

New block copolymers of the ABA type, where B stands for polybutadiene (PBD) and A for polyglycidylmethacrylate(PGMA), poly(methylmethacrylate(MMA)-co-GMA) and PMMA-b-PGMA, respectively, have been ... [more ▼]

New block copolymers of the ABA type, where B stands for polybutadiene (PBD) and A for polyglycidylmethacrylate(PGMA), poly(methylmethacrylate(MMA)-co-GMA) and PMMA-b-PGMA, respectively, have been successfully synthesized by using the diadduct of tert-butyllithium (tert-BuLi) to meta-diisopropenylbenzene (m-DIB) as a difunctional initiator. The PBD midblock has been synthesized in a cyclohexane/diethylether (100/6, v/v) mixture at room temperature, whereas the methacrylate outer blocks have been synthesized in a cyclohexane/diethylether/THF (100/6/150, v/v/v) mixture at -78°C. Block copolymers of a very narrow molecular weight distribution (1.10) have been analyzed by differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and tensile testing. These materials are phase separated and can exhibit tensile strength up to 22 MPa together with very high elongation at break (1500%). [less ▲]

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See detailOverexpression and function of the CIPAR1 gene in a rat prostatic cell line.
Cornet, Anne ULg

Scientific conference (1997, November 29)

In prostate cancer therapy, as the components of the cell death pathway play an important role, it is conceivable that targeted transfer of apoptosis inducer genes into prostatic cells could be useful. A ... [more ▼]

In prostate cancer therapy, as the components of the cell death pathway play an important role, it is conceivable that targeted transfer of apoptosis inducer genes into prostatic cells could be useful. A new gene, CIPAR1 (Castration Induced Prostatic Apoptosis Related gene 1) was identified by differential screening for genes that were upregulated when rat prostates were induced to undergo apoptosis. To define the role of CIPAR1 in the apoptosis pathway, we have therefore investigated its ability to induce apoptosis in the Mat LyLu cells. The CIPAR1 gene was transiently overexpressed in these cells. The rate of apoptosis in the transfected cells was estimated with the help of the following tests: qualitative methods (DNA ladder, TUNEL on slide) and also quantitative methods using flow cytolmetric analysis. Induction of apoptosis was higher in the pcDNA3-CIPAR1 transfected cells than in controls. The establishment of a stable cell line that contains the gene CIPAR1 under the control of an inducible promoter would be an useful model to study the role of CIPAR1 in prostatic cell death. [less ▲]

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See detailLes renseignements erronés comme motif d'acquittement
Delnoy, Michel ULg

in Immobilier (1997), 22

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See detailModelling Glacial-Interglacial Atmospheric CO2 Variations: The Role of Continental Weathering.
Munhoven, Guy ULg

Doctoral thesis (1997)

An eleven-box model of the ocean-atmosphere subsystem of the global carbon cycle is developed to study the potential contribution of continental rock weathering and of oceanic sedimentation to variations ... [more ▼]

An eleven-box model of the ocean-atmosphere subsystem of the global carbon cycle is developed to study the potential contribution of continental rock weathering and of oceanic sedimentation to variations of atmospheric CO2 pressure over glacial-interglacial time scales. The model is capable of reproducing the present-day distributions of total dissolved inorganic carbon, total alkalinity, phosphate, δ13C, and Δ14C between the various ocean basins, as well as the partial pressure of atmospheric CO2. A simple sedimentation scheme drives carbonate deposition and dissolution at the sea-floor as a function of the depths of carbonate and aragonite lysoclines in each ocean basin considered (Atlantic, Antarctic and Indo-Pacific). Carbonate accumulation on the shelf is also taken into account. Three different methods are used to calculate histories for the evolution of CO2 consumption by continental rock weathering processes, with special emphasis on silicate weathering. The first method relies on the marine 87Sr/86Sr isotopic record. We find that this record does not represent a very strong constraint, due to the large spread of the 87Sr/86Sr ratios of waters draining silicate terrains. It is possible to construct a silicate weathering history that reproduces both the strontium isotopic record and the glacial-interglacial CO2 signal. This weathering history implies that CO2 consumption by silicate rock weathering was about 120% higher during glacial than during interglacial time. The second approach is based upon the marine Ge/Si record. Taking the major uncertainties in the knowledge of the Ge and Si cycles into account, several histories for the evolution of the riverine dissolved silica fluxes are calculated from this record. The investigation of the systematics between riverine dissolved silica and bicarbonate fluxes under different weathering regimes leads us to the tentative conclusion that, although there is no correlation between dissolved silica and total bicarbonate concentrations in the major rivers, there may exist a negative correlation between weathering intensity and the ratio of bicarbonate derived from silicate weathering alone to dissolved silica. With this correlation as a working hypothesis, it is possible to interpret the dissolved silica fluxes in terms of equivalent CO2 consumption rates. The calculated histories indicate that glacial rates of CO2 consumption by chemical silicate rock weathering could have been twice, and possibly up to three times and a half, as high as they are today. When used to force the carbon cycle model, they are responsible for glacial-interglacial pCO2 variations in the atmosphere of typically 50-60 ppm and up to 95-110 ppm. These variations are superimposed to a basic oscillation of 60 ppm generated by the model, mainly in response to coral reef buildup and erosion processes. The total pCO2 signal has an amplitude of about 80-90 ppm and up to 125-135 ppm. Although these large amplitudes indicate that silicate weathering processes should be taken into account when studying glacial-interglacial changes of CO2 in the atmosphere, it also raises new problems, such as too high CO2 levels during the period from 110-70 kyr B.P. In the third approach, the glacial-interglacial histories for the consumption of CO2 and the resulting transfer of bicarbonate to the ocean are calculated from the erosion model GEM-CO2}. The required variations of the continental runoff are derived from four different GCM climatologies. We find that the CO2 consumption and river bicarbonate fluxes were about 20% higher at the last glacial maximum than at present. The exposed shelf accounts for a large fraction of the calculated LGM flux, overcompensating the 20% decrease of the two fluxes over the continent. The constructed weathering scenarios still produce pCO2 variations of about 60 ppm between glacial and interglacial times, but the contribution from variable silicate weathering to this signal is now reduced to only 12+/-5 ppm. [less ▲]

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See detailCharacterization of polyacrylonitrile films grafted onto nickel by ellipsometry, atomic force microscopy and X-ray reflectivity
Calberg, Cédric ULg; Mertens, Marc; Jérôme, Robert ULg et al

in Thin Solid Films (1997), 310(1-2), 148-155

The thickness and roughness of polyacrylonitrile films electrografted on a nickel surface have been measured by ellipsometry, atomic force microscopy and X-ray reflectivity. From combined ellipsometry and ... [more ▼]

The thickness and roughness of polyacrylonitrile films electrografted on a nickel surface have been measured by ellipsometry, atomic force microscopy and X-ray reflectivity. From combined ellipsometry and X-ray reflectivity measurements, accurate values for the refractive indices of polyacrylonitrile and nickel have been derived at a 6328-Åwavelength. Dependence of the film thickness on the monomer concentration has been quantified for the first time. Furthermore, the thickness of the polyacrylonitrile (PAN) film is related to the nature of the solvent, depending on whether it is a good solvent for PAN (dimethylformamide; DMF) or not (acetonitrile; ACN). [less ▲]

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See detailEpidémie à Acinetobacter anitratus: un réservoir inédit
MELIN, Pierrette ULg

Conference (1997, November 18)

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See detailColloquium entitled: “The Dynamics of Social Integration and Social Exclusion at the Neighbourhood Level”
Martiniello, Marco ULg; Body-Gendrot, Sophie

Scientific conference (1997, November 06)

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