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See detailEtude des causes de la ruine du Bateau Ave Maria,
Rigo, Philippe ULiege

Report (1999)

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See detailThe Catalytic, Glycosyl Transferase and Acyl Transferase Modules of the Cell Wall Peptidoglycan-Polymerizing Penicillin-Binding Protein 1b of Escherichia Coli
Terrak, Mohammed ULiege; Ghosh, Tushar K.; van Heijenoort, Jean et al

in Molecular Microbiology (1999), 34(2), 350-364

The penicillin-binding protein (PBP) 1b of Escherichia coli catalyses the assembly of lipid-transported N-acetyl glucosaminyl-beta-1, 4-N-acetylmuramoyl-L-alanyl-gamma-D-glutamyl-(L)-meso-diaminopimelyl ... [more ▼]

The penicillin-binding protein (PBP) 1b of Escherichia coli catalyses the assembly of lipid-transported N-acetyl glucosaminyl-beta-1, 4-N-acetylmuramoyl-L-alanyl-gamma-D-glutamyl-(L)-meso-diaminopimelyl+ ++- (L)-D-alanyl-D-alanine disaccharide pentapeptide units into polymeric peptidoglycan. These units are phosphodiester linked, at C1 of muramic acid, to a C55 undecaprenyl carrier. PBP1b has been purified in the form of His tag (M46-N844) PBP1bgamma. This derivative provides the host cell in which it is produced with a functional wall peptidoglycan. His tag (M46-N844) PBP1bgamma possesses an amino-terminal hydrophobic segment, which serves as transmembrane spanner of the native PBP. This segment is linked, via an congruent with 100-amino-acid insert, to a D198-G435 glycosyl transferase module that possesses the five motifs characteristic of the PBPs of class A. In in vitro assays, the glycosyl transferase of the PBP catalyses the synthesis of linear glycan chains from the lipid carrier with an efficiency of congruent with 39 000 M-1 s-1. Glu-233, of motif 1, is central to the catalysed reaction. It is proposed that the Glu-233 gamma-COOH donates its proton to the oxygen atom of the scissile phosphoester bond of the lipid carrier, leading to the formation of an oxocarbonium cation, which then undergoes attack by the 4-OH group of a nucleophile N-acetylglucosamine. Asp-234 of motif 1 or Glu-290 of motif 3 could be involved in the stabilization of the oxocarbonium cation and the activation of the 4-OH group of the N-acetylglucosamine. In turn, Tyr-310 of motif 4 is an important component of the amino acid sequence-folding information. The glycosyl transferase module of PBP1b, the lysozymes and the lytic transglycosylase Slt70 have much the same catalytic machinery. They might be members of the same superfamily. The glycosyl transferase module is linked, via a short junction site, to the amino end of a Q447-N844 acyl transferase module, which possesses the catalytic centre-defining motifs of the penicilloyl serine transferases superfamily. In in vitro assays with the lipid precursor and in the presence of penicillin at concentrations sufficient to derivatize the active-site serine 510 of the acyl transferase, the rate of glycan chain synthesis is unmodified, showing that the functioning of the glycosyl transferase is acyl transferase independent. In the absence of penicillin, the products of the Ser-510-assisted double-proton shuttle are glycan strands substituted by cross-linked tetrapeptide-pentapeptide and tetrapeptide-tetrapeptide dimers and uncross-linked pentapeptide and tetrapeptide monomers. The acyl transferase of the PBP also catalyses aminolysis and hydrolysis of properly structured thiolesters, but it lacks activity on D-alanyl-D-alanine-terminated peptides. This substrate specificity suggests that carbonyl donor activity requires the attachment of the pentapeptides to the glycan chains made by the glycosyl transferase, and it implies that one and the same PBP molecule catalyses transglycosylation and peptide cross-linking in a sequential manner. Attempts to produce truncated forms of the PBP lead to the conclusion that the multimodular polypeptide chain behaves as an integrated folding entity during PBP1b biogenesis. [less ▲]

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See detailAntimicrobial Susceptibility of Streptococcus agalactiae isolated from patients in Belgium through 1989-1991 and 1996-1999
MELIN, Pierrette ULiege; Rodriguez Cuns, Grisel; Vincento Fernandez, Walter et al

Poster (1999, October)

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See detailCrossover Iliofemoral Bypass Grafting for Treatment of Unilateral Iliac Atherosclerotic Disease
Defraigne, Jean-Olivier ULiege; Vazquez, C.; Limet, Raymond ULiege

in Journal of Vascular Surgery : Official Publication, the Society for Vascular Surgery and International Society For Cardiovascular Surgery, North American Chapter (1999), 30(4), 693-700

PURPOSE: In patients with unilateral iliac disease, a less invasive procedure than aortobifemoral bypass grafting may be desirable, especially in poor-risk patients or when sexual dysfunction is feared ... [more ▼]

PURPOSE: In patients with unilateral iliac disease, a less invasive procedure than aortobifemoral bypass grafting may be desirable, especially in poor-risk patients or when sexual dysfunction is feared. In these cases, femorofemoral (FF) bypass grafting is often proposed. Compared with FF bypass grafting, iliofemoral (IF) bypass grafting avoids bilateral exposure of the groins, which may reduce the risk of infection. When the primitive iliac artery is occluded from its origin or heavily calcified, one may use the contralateral artery as inflow, after a small retroperitoneal exposure, to perform a crossover iliofemoral (CIF) bypass grafting procedure, through the Retzius space. Our 10-year experience with CIF bypass grafting in a select group of patients was studied. METHODS: Between 1986 and 1996, 36 patients underwent CIF bypass grafting for symptomatic unilateral iliac occlusion or stenosis. All patients were examined by means of Doppler ultrasound scanning and underwent bilateral multiplane angiography. Patients were considered for this procedure when the ipsilateral common iliac artery was occluded from its origin or was diffusely and heavily calcified. The decision to perform a CIF bypass grafting procedure was made when no significant disease of the contralateral common iliac artery was seen, and patients who had features of contralateral iliac disease were excluded. The main outcomes were perioperative mortality and morbidity, long-term primary and secondary patency rates, and limb salvage rate. RESULTS: The study included 31 men and five women, with a mean age of 58.8 years. Indications for bypass grafting were disabling claudication (26 of 36 patients, 72%) and limb-threatening ischemia (10 of 26 patients, 28%). Twelve procedures were performed simultaneously: endarterectomy of the recipient common femoral artery (n = 3), femoropopliteal bypass grafting (n = 4, 11.1%), profundoplasty (n = 4, 11%), and right internal carotid endarterectomy (n = 1). New postoperative erectile dysfunction did not develop in any of the patients. The survival rate was 97.3% at 1 year and 68.5% at 5 years. The primary and secondary patency rates were 94% and 100%, respectively, at 1 year and 76.7% and 95%, respectively, at 5 years. The limb salvage rate was 100% at 1 year and 87% at 3 years. CONCLUSION: The operative mortality associated with CIF is low. The long-term primary and secondary patency rates are satisfactory, and they are lower than those reported for aortobifemoral bypass grafting. This procedure does not preclude a later performance of an aortobifemoral bypass grafting procedure. CIF bypass grafting is not only suitable for poor-risk patients with a limited life expectancy who have the appropriate arterial anatomy, but also may be warranted for young patients in whom erectile dysfunction is feared. [less ▲]

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See detailLack of Cell Wall Peptidoglycan Versus Penicillin Sensitivity: New Insights into the Chlamydial Anomaly
Ghuysen, Jean-Marie ULiege; Goffin, Colette

in Antimicrobial Agents and Chemotherapy (1999), 43(10), 2339-2344

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See detailNew catalysis for fast bulk ring-opening polymerization of lactide monomers
Degée, Philippe; Dubois, Philippe ULiege; Jérôme, Robert ULiege et al

in Macromolecular Symposia (1999), 144

The ring-opening polymerization of lactides has been studied in bulk using either 2-ethylhexanoic acid tin(II) salt, Sn(Oct)2, or aluminum triisopropoxide, Al(OiPr)3, as the initiator over a wide range of ... [more ▼]

The ring-opening polymerization of lactides has been studied in bulk using either 2-ethylhexanoic acid tin(II) salt, Sn(Oct)2, or aluminum triisopropoxide, Al(OiPr)3, as the initiator over a wide range of temperature and monomer-to-initiator molar ratio, A high increase in the bulk polymerization rate has been observed when the initiator was added with an equimolar amount of a Lewis base, such as triphenylphosphine and 4-picoline (C6H7N) added to Sn(Oct)2 and Al(OiPr)3, respectively Melt stable polylactides of high molecular weight and reasonably narrow molecular weight distribution have been accordingly prepared. The use of the Sn(Oct)2. equimolar combination has allowed for reaching an acceptable balance between propagation and depolymerization rates, so that the polymerization is fast enough to be performed through a continuous single-stage process in a twin-screw extruder A global activation mechanism is proposed and discussed by comparison with both investigated initiation systems. [less ▲]

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See detailCulture of Gingival Fibroblasts on Bioabsorbable Regenerative Materials in Vitro
Simain-Sato, Franklin ULiege; Lahmouzi, Jamila ULiege; Kalykakis, G. K. et al

in Journal of Periodontology (1999), 70(10), 1234-9

BACKGROUND: The use of membranes in guided tissue regeneration (GTR) can limit the apical migration of gingival cells and favor the establishment of new attachment by periodontal ligament fibroblasts ... [more ▼]

BACKGROUND: The use of membranes in guided tissue regeneration (GTR) can limit the apical migration of gingival cells and favor the establishment of new attachment by periodontal ligament fibroblasts. However, gingival recession during healing following GTR has been described as a frequent complication. The purpose of this study was to determine if gingival fibroblasts are affected by the composition of the bioabsorbable membranes used in mucogingival surgery. METHODS: Two type of bioabsorbable regenerative materials were used as cell carriers. Wistar rat gingival fibroblasts (RGF) were obtained from attached gingiva, cut into small fragments, and placed in culture dishes. When confluent, cells were detached using trypsin and identified as "first transferred cells" (P1). At the third passage (P3), cell count, trypan blue exclusion test, acid phosphatase activity, DNA synthesis, phase contrast microscopy, and scanning electron microscopy were performed. The cells were then placed in wells containing the membranes and incubated for 72 hours. RESULTS: When examined under microscopy, the control wells (without membranes) showed one cell type with the elongated appearance characteristic of fibroblasts. The wells with membranes showed an altered cell morphology with a high proportion of cell fragments regardless of the type of membrane used. CONCLUSIONS: These results suggest that cell carrier membranes could affect RGF morphology and thus alter gingival tissue healing following GTR. [less ▲]

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See detailLa chirurgie des yeux dans les papyrus grecs d’Égypte
Marganne, Marie-Hélène ULiege

in Réalités Ophtalmologiques (1999), 68

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See detailL'enfant dans l'Égypte gréco-romaine
Marganne, Marie-Hélène ULiege

in Revue de Pédiatrie (La) (1999), 30(298-7), 30-37

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See detailMulti-Sensor Image Fusion: 3-D Visualization and Search Agents
Waxman, Allen M.; Ross, William; Streilein, William et al

Conference (1999, October)

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See detailAssociation of Tibolone and Fluoride Displays a Pronounced Effect on Bone Mineral Density in Postmenopausal Osteoporotic Women
Reginster, Jean-Yves ULiege; Agnusdei, D.; Gennari, C. et al

in Gynecological Endocrinology : The Official Journal of the International Society of Gynecological Endocrinology (1999), 13(5), 361-8

A double-blind, placebo-controlled, randomized, prospective two-center study was carried out to assess the effects of tibolone + fluoride versus placebo + fluoride therapy on trabecular and cortical bone ... [more ▼]

A double-blind, placebo-controlled, randomized, prospective two-center study was carried out to assess the effects of tibolone + fluoride versus placebo + fluoride therapy on trabecular and cortical bone in postmenopausal osteoporotic women. Ninety-four subjects (mean age 61.1 years, postmenopausal 13.5 years on average) with low bone mineral density (BMD) at baseline were randomized to 2.5 mg of tibolone (Org OD 14, Livial) plus 26.4 mg of fluoride (Fluocalcic) or placebo plus 26.4 mg of fluoride daily over 2 years; 55 (58.5%) subjects completed the study, the main reason for discontinuation being untoward gastrointestinal effects. BMD at the lumbar spine was measured by both dual photon absorptiometry (DPA) and dual-energy X-ray absorptiometry (DXA), and at the hip by DXA at 6-month intervals. Baseline values (DXA, g/cm2) for tibolone + fluoride and placebo + fluoride groups were 0.733 and 0.744 for the lumbar spine, and 0.761 and 0.788 for the hip. Change from baseline and percentage change from baseline were calculated for the intent-to-treat and completers groups. An analysis of variance (ANOVA) model or Wilcoxon test was used for statistical evaluation. There was a mean increase in BMD at the lumbar spine measured by DPA of 25.3% and 12.3% in tibolone + fluoride and placebo + fluoride groups, respectively (p = 0.01); with DXA, respective changes were 32.6% and 14.0% (p = 0.013). Data on BMD at the hip showed mean increases of 7.9% and 2.6% for the tibolone + fluoride and placebo + fluoride groups, respectively. We conclude that combined tibolone + fluoride treatment induces a highly significant increase in BMD at the lumbar spine without simultaneous loss of the cortical bone allowing for a meaningful reduction of the fluoride dose when given in combination with tibolone. [less ▲]

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See detailLa gestion de la santé par des jeunes défavorisés : une action pluridisciplinaire
Grignard, Sophie; Lechien, Xavier; Vandoorne, Chantal ULiege

Report (1999)

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See detail18 kyr, 120 kyr & 5 Myr shortening rates along the front of the southern Tianshan Mountains (China),
Hubert, Aurelia ULiege; Suppe, J; Wang, Xin et al

in Geological Society of America - Abstracts with Programs (1999, October), 31(7),

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See detailLes sensibilités territoriales
Schmitz, Serge ULiege

Doctoral thesis (1999)

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See detailSclerosing encapsulating peritonitis in two young Dobberman
Michiels, L.; Peeters, Dominique ULiege; Hansen, P. et al

in 9th ESVIM Meeting - Perugia - Italie (1999, October)

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See detailVers l'infini pas à pas : approche heuristique de l'analyse (AHA) - Guide méthodologique
Bolly, Pierre; Chevalier, A; Citta-Vanthemsche, M et al

Book published by De Boeck (1999)

Detailed reference viewed: 46 (1 ULiège)