References of "1997"
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See detailOptimisation et Scale up des Fermentations de Production de Starters Lactiques.
Hamdi, M.; Hamza, S.; Amor, L. et al

Poster (1997, October 27)

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See detailLes applications des bactéries lactiques
Thonart, Philippe ULg

Conference (1997, October 27)

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See detailIdentification de la flore lactique du lait fermenté traditionnel tunisien (lben) et évaluation des composés aromatisants
Ben Amor, K.; Cornelius, C.; Mahjoub, A. et al

Poster (1997, October 27)

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See detailX ray in RDS with HFOV and surfactant: what has changed ?
Battisti, Oreste ULg; Rausin, L.; Khamis, J. et al

Conference (1997, October 24)

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See detailspontaneous pneumothorax treated by HFOV
Battisti, Oreste ULg; Petermans, M. F.; François, A. et al

Conference (1997, October 24)

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See detailA two year experience with primary high frequency ventilation in neonatal respiratory distress syndrome
Battisti, Oreste ULg; Detaille, T.; François, A. et al

Conference (1997, October 24)

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See detailA comparison of two methods for pulmonary function testing in horses with upper and lower airway obstruction
Van Erck, Emmanuelle; Duvivier, D. H.; Art, Tatiana ULg et al

Poster (1997, October 24)

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See detailMolecular weight effects on polystyrene fingerprint time-of-flight secondary ion mass spectroscopy (ToF-SIMS) spectra
Vanden Eynde, X.; Bertrand, P.; Jérôme, Robert ULg

in Macromolecules (1997), 30(21), 6407-6416

Monodisperse polystyrenes (PS) of different molecular weights (Mn) synthesized by living anionic polymerization with three types of butyllithium initiator (linear, n; secondary, sec; and tertiary, tert ... [more ▼]

Monodisperse polystyrenes (PS) of different molecular weights (Mn) synthesized by living anionic polymerization with three types of butyllithium initiator (linear, n; secondary, sec; and tertiary, tert) were analyzed by ToF-SIMS (time-of-flight secondary ion mass spectrometry). The influence of the molecular weight on the secondary ion intensities was studied in detail for the fingerprint part of the mass spectra (with m/z < 200). A drastic effect was observed for Mn values below 104, related to the presence of the saturated butyl end group. An extra hydrogen transfer originating from this end group during the secondary ion formation must be invoked to explain the data. Only the first neighbor monomer repeat units seem to be affected. This H exchange increases the intensity of ions containing more hydrogen or needing H transfer for their formation as the tropylium ion (C7H7+ at m/z = 91). The molecular structure of the butyl end group is found to influence greatly not only the intensity of their parent ion but also the PS characteristic ion intensities. Indeed, the tert-butyl end group is seen unable to produce the H transfer observed for the n- and sec-butyl ones. A model is proposed to take the influence of the end group on the PS SIMS fragmentation pattern into account. The parameters of this model allow the quantification of the end group interaction. [less ▲]

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See detailPoly[poly(isobornyl methacrylate-co-methyl methacrylate) (poly(IBMA-co-MMA))-b-polybutadiene-b-poly(IBMA-co-MMA)] Copolymers: synthesis, morphology, and properties
Yu, J. M.; Dubois, Philippe ULg; Jérôme, Robert ULg

in Macromolecules (1997), 30(21), 6536-6543

Anionic random and block copolymerization of isobornyl methacrylate (IBMA) and methyl methacrylate (MMA) has been studied in THF at −78 °C by using (1,1-diphenyl-3,3-dimethylbutyl)lithium (DDBLi) as ... [more ▼]

Anionic random and block copolymerization of isobornyl methacrylate (IBMA) and methyl methacrylate (MMA) has been studied in THF at −78 °C by using (1,1-diphenyl-3,3-dimethylbutyl)lithium (DDBLi) as initiator in the presence of LiCl. The random copolymerization of MMA and IBMA has also been carried out at 0 °C, all the other conditions being kept unchanged. Poly[poly(IBMA)-b-poly(BD)-b-poly(IBMA)] (IBI), poly[poly(IBMA-co-MMA)-b-poly(BD)-b-poly(MMA-co-IBMA)] (I/MBM/I), and poly[poly(IBMA)-b-poly(MMA)-b-poly(BD)-b-poly(MMA)-b-poly(IBMA)] (IMBMI) block copolymers have been synthesized by sequential anionic polymerization of butadiene, MMA, and IBMA initiated by the m-diisopropenylbenzene (m-DIB)/tert-butyllithium (t-BuLi) diadduct. These block copolymers of a monomodal and narrow molecular weight distribution (M̄w/M̄n = 1.1) have been analyzed by size exclusion chromatography (SEC), NMR, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and transmission electron microscopy (TEM). Stereocomplexation of IMBMA and I/MBM/I with iPMMA has also been studied by DSC. Although IBI triblock copolymers show a lamellar morphology even for relatively low hard block content (33 wt %), cylindrical and lamellar morphologies have been observed for the other block copolymers under consideration. These new block copolymers exhibit high ultimate tensile strength (30 MPa), elongation at break (1000%), and upper service temperature (140−200 °C). [less ▲]

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See detailDiscrepancy in hemoglobin A1c results obtained by HPLC and CE: influence of carbamyl HB
Gougnard, Th; Chapelle, Jean-Paul ULg; Charlier, Corinne ULg et al

Poster (1997, October 18)

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See detailLa loi du 4 mars 1997 instituant le collège des procureurs généraux et créant la fonction de magistrat national : que reste-t-il de l’indépendance du Ministère public?
Masset, Adrien ULg

in Journal des Tribunaux (1997), 5856(32), 649-651

La loi du 4 mars 1997 instituant le collège des procureurs généraux et créant la fonction de magistrat national est présentée, par le législateur lui-même, comme la traduction de la volonté d’entériner ... [more ▼]

La loi du 4 mars 1997 instituant le collège des procureurs généraux et créant la fonction de magistrat national est présentée, par le législateur lui-même, comme la traduction de la volonté d’entériner une situation de fait existante. Le propos n'est pas de détailler la teneur de cette loi, mais plutôt de mettre en exergue l’expropriation croissante, au bénéfice du ministre de la Justice, de l’indépendance du ministère public par rapport à ce même ministre de la Justice, dans le domaine de la politique criminelle [less ▲]

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See detailLes hypertensions artérielles d'origine endocrinienne
Beckers, Albert ULg

Scientific conference (1997, October 17)

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See detailPsychrophilic Enzymes: A Thermodynamic Challenge
Gerday, Charles ULg; Aittaleb, Mohamed; Arpigny, Jean Louis et al

in Biochimica et Biophysica Acta (1997), 1342(2), 119-31

Psychrophilic microorganisms, hosts of permanently cold habitats, produce enzymes which are adapted to work at low temperatures. When compared to their mesophilic counterparts, these enzymes display a ... [more ▼]

Psychrophilic microorganisms, hosts of permanently cold habitats, produce enzymes which are adapted to work at low temperatures. When compared to their mesophilic counterparts, these enzymes display a higher catalytic efficiency over a temperature range of roughly 0-30 degrees C and a high thermosensitivity. The molecular characteristics of cold enzymes originating from Antarctic bacteria have been approached through protein modelling and X-ray crystallography. The deduced three-dimensional structures of cold alpha-amylase, beta-lactamase, lipase and subtilisin have been compared to their mesophilic homologs. It appears that the molecular adaptation resides in a weakening of the intramolecular interactions, and in some cases in an increase of the interaction with the solvent, leading to more flexible molecular edifices capable of performing catalysis at a lower energy cost. [less ▲]

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See detailSite-Directed Mutagenesis of the Actinomadura R39 DD-Peptidase
Zhao, GuoHua; Duez, Colette ULg; Forceille, Christine et al

in Biochemical Journal (1997), 327(2), 377-381

The role of various residues in the conserved structural elements of the Actinomadura R39 penicillin-sensitive dd-peptidase has been studied by site-directed mutagenesis. Replacement of Ser-298 of the ... [more ▼]

The role of various residues in the conserved structural elements of the Actinomadura R39 penicillin-sensitive dd-peptidase has been studied by site-directed mutagenesis. Replacement of Ser-298 of the 'SDN loop' by Ala or Gly significantly decreased the kcat/Km value for the peptide substrate, but only by a factor of 15 and had little effect on the other catalytic properties. Mutations of Asn-300 of the same loop and of Lys-410 of the KTG triad yielded very unstable proteins. However, the N300S mutant could be purified as a fusion protein with thioredoxin that exhibited decreased rates of acylation by the peptide substrate and various cephalosporins. Similar fusion proteins obtained with the N300A, K410H and K410N mutants were unstable and their catalytic and penicillin-binding properties were very strongly affected. In transpeptidation reactions, the presence of the acceptor influenced the kcat/Km values, which suggested a catalytic pathway more complex than a simple partition of the acyl-enzyme between hydrolysis and aminolysis. These results are compared with those obtained with two other penicillin-sensitive enzymes, the Streptomyces R61 dd-peptidase and Escherichia coli penicillin-binding protein (PBP) 5. [less ▲]

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See detailLes vertus de la traduction
Bodson, Arthur ULg

Scientific conference (1997, October 11)

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See detailEglise et société moderne aux XIXe-XXe s.
Jadoulle, Jean-Louis ULg

Scientific conference (1997, October 10)

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See detailThe basic pattern of activation in motor and sensory temporal tasks: positron emission tomography data
Lejeune, Helga ULg; Maquet, Pierre ULg; Bonnet, Michel et al

in Neuroscience Letters (1997), 235(1-2), 21-24

Positron emission tomography (PET) data were obtained from subjects performing a synchronization task (target duration 2700 ms). A conjunction analysis was run to identify areas prominently activated both ... [more ▼]

Positron emission tomography (PET) data were obtained from subjects performing a synchronization task (target duration 2700 ms). A conjunction analysis was run to identify areas prominently activated both in this task and in a temporal generalization task (target duration 700 ms) used previously. The common pattern of activation included the right prefrontal, inferior parietal and anterior cingulate cortex, the left putamen and the left cerebellar hemisphere. These areas are assumed to play a major role in time processing, in relation to attention and memory mechanisms. [less ▲]

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