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Peer Reviewed
See detailCollaborative Multi-Camera Tracking of Athletes in Team Sports
Du, Wei ULiege; Hayet, Jean-Bernard; Piater, Justus ULiege et al

in Workshop on Computer Vision Based Analysis in Sport Environments (CVBASE) (2006)

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See detailCollaborative study of an liquid chromatographic method for the determination of R-timolol and other related substances in S-timolol maleate
Marini Djang'Eing'A, Roland ULiege; Matthijs, N.; Vanderheyden, Yvan et al

in Analytica Chimica Acta (2005), 546(2), 182-192

A collaborative study applying an enantiomeric liquid chromatographic (LC) method was carried out to determine the content of the enantiomeric impurity R-timolol and other related substances in three ... [more ▼]

A collaborative study applying an enantiomeric liquid chromatographic (LC) method was carried out to determine the content of the enantiomeric impurity R-timolol and other related substances in three different S-timolol maleate samples. Eight laboratories, all located in Europe, participated in the study. The quantitative results obtained were used to estimate the uncertainty on the content of the different impurities. For that purpose, a set-up was adapted from the ISO guidelines 5725-2, which allowed the estimation of the different variances, i.e. the between-laboratories (s(laboratories)(2)), the between-days (s(days)(2)) and the between-replicates (s(replicates)(2)), The variances of repeatability (s(r)(2)) and reproducibility (s(R)(2)) were then calculated using the equations s(r)(2) = s(replicates)(2) and s(R)(2) = s(replicates)(2) + s(days)(2) + s(laboratories)(2). For the timolol impurities, it was found that the estimated uncertainty seem to be concentration-dependent. Since the LC method which combines the compendial ones for enantiomeric purity and related substances testing was applied to evaluate uncertainty in this collaborative study, it was shown how a laboratory can evaluate the uncertainty of its results when applying the method in the future. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailCollaborer avec des enseignants-témoins en formation pédagogique d’adultes – Finalités, difficultés et plus-values
Leduc, Laurent ULiege; Detroz, Pascal ULiege; Verpoorten, Dominique ULiege

Poster (2015, November 10)

En prélude à une étude empirique, ce poster problématise la décision pédagogique de faire intervenir, au cours d’une formation, des enseignants pour témoigner devant d’autres enseignants de leur pratique ... [more ▼]

En prélude à une étude empirique, ce poster problématise la décision pédagogique de faire intervenir, au cours d’une formation, des enseignants pour témoigner devant d’autres enseignants de leur pratique. Le poster recourt au QQOQCP (qui-quoi-où-quand-comment-pourquoi), une méthode qui allie simplicité et souci de complétude dans le balisage initial d’un phénomène. Sans remettre en cause la richesse des témoignages par des enseignants dans un contexte de formation, ni la satisfaction que beaucoup de participants estiment en retirer, le poster plaide pour une approche raisonnée des témoignages en soulignant certaines tensions et ambiguïtés qui peuvent marquer ces derniers. [less ▲]

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See detailCollaborer entre médecins et infirmiers, une affaire de complémentarité
Dispas, Hélène; Buret, Laetitia ULiege

in Santé Conjuguée (2016), 74

Pénurie de médecins, complexification des pathologies et des situations: La question d'une réorganisation des soins et du partage des tâches entre médecins et infirmiers est au coeur de l'actualité. Son ... [more ▼]

Pénurie de médecins, complexification des pathologies et des situations: La question d'une réorganisation des soins et du partage des tâches entre médecins et infirmiers est au coeur de l'actualité. Son examen sous des angles diverses permet d'interroger la collaboration interdisciplinaire.Analyse croisant des expériences internationales avec celles des maisons médicales [less ▲]

Detailed reference viewed: 72 (5 ULiège)
See detailLe collage des restaurations all ceram
MAINJOT, Amélie ULiege

Conference (2008)

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See detailLe collage-scellement des restaurations all-ceram
Van Heusden, Alain ULiege; Gueders, Audrey ULiege

in Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(2), 109-21

The objective of this article is to synthesize the current scientific data relating to the bonding of ceramic restorations in order to present a reliable and reproductive clinical method for the general ... [more ▼]

The objective of this article is to synthesize the current scientific data relating to the bonding of ceramic restorations in order to present a reliable and reproductive clinical method for the general practitioner. The different ceramic treatments are explained with a distinction between those which can be etched and the others. A precise check list is suggested for the conditioning of dental tissues and ceramic surfaces. [less ▲]

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See detailCollagen catabolism through Coll2-1 and Coll2-1NO and myeloperoxidase activity in marathon runners.
Henrotin, Yves ULiege; Labasse, Alain; Franck, Thierry ULiege et al

in SpringerPlus (2013), 2(1), 92

To determine the influence of marathon on the serum levels of two markers of cartilage degradation, Coll2-1 and its nitrated form, Coll2-1NO2, and of a marker of neutrophils activation, the ... [more ▼]

To determine the influence of marathon on the serum levels of two markers of cartilage degradation, Coll2-1 and its nitrated form, Coll2-1NO2, and of a marker of neutrophils activation, the myeloperoxidase (MPO). Coll2-1, Coll2-1NO2, total and active MPO were measured in 98 marathon runners without joint pain and with an average age of 47 years. Sera were taken at rest right before the departure and within 30 min after the marathon. The subjects were submitted to a questionnaire concerning their physical activity and their life style. The levels of Coll2-1, Coll2-1NO2 and active MPO were not affected by age, body mass index, sex or performance. The levels of total MPO were higher in female than in male (p < 0.05), but were not affected by the other parameters. After the marathon, Coll2-1 and Coll2-1NO2 concentrations were slightly but systematically decreased. The total and active MPO concentrations were increased by 2 to 3-fold in comparison to the pre-marathon values (p < 0.001 for total and active MPO). The active MPO/total MPO ratio was significantly enhanced after the marathon (p < 0.001). The variation of total MPO during the marathon was negatively correlated with the training time per week (r = -0.34; p = 0.009). The serum levels of Coll2-1 and Coll2-1NO2 were slightly decreased by marathon, indicating that intensive running could reduce cartilage catabolism. Furthermore, Coll2-1NO2 was not correlated with the total and active MPO indicating that Coll2-1 nitration did not result of a systemic oxidative phenomenon but reflects local changes. [less ▲]

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See detailCollagen fibril arabesques in connective tissue disorders.
Hermanns-Lê, Trinh ULiege; Pierard, Gérald ULiege

in American Journal of Clinical Dermatology (2006), 7(5), 323-6

BACKGROUND: In various connective tissue disorders, collagen fibrils and elastic fibers may exhibit some ultrastructural abnormalities. OBJECTIVE: This electron microscopy study focused on collagen fibril ... [more ▼]

BACKGROUND: In various connective tissue disorders, collagen fibrils and elastic fibers may exhibit some ultrastructural abnormalities. OBJECTIVE: This electron microscopy study focused on collagen fibril orientation and unusual shapes in the dermis of Ehlers-Danlos syndrome (EDS) and related entities, including spontaneous cervical artery dissection syndrome and recurrent preterm premature rupture of fetal membranes syndrome. RESULTS: In addition to some abnormal fibril shapes typically found in these syndromes, other conformations (hook shaped, S shaped, ring shaped) that have not been illustrated previously in the literature were observed. CONCLUSION: The abnormal collagen fibril conformations observed in EDS and other related conditions characterized by tissue fragility likely affect both the internal cohesiveness of the bundles and the mechanobiologic properties of the tissue. [less ▲]

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See detailCollagen fibril disruption occurs early in primary guinea pig knee osteoarthritis.
Huebner, J. L.; Williams, J. M.; Deberg, Michelle ULiege et al

in Osteoarthritis and Cartilage (2010), 18(3), 397-405

OBJECTIVE: A major barrier inhibiting the discovery of structural modifying agents for osteoarthritis (OA) is an incomplete understanding of early disease events. Herein, we investigated the time course ... [more ▼]

OBJECTIVE: A major barrier inhibiting the discovery of structural modifying agents for osteoarthritis (OA) is an incomplete understanding of early disease events. Herein, we investigated the time course of collagen II cleavage and fibril disruption in the well-validated Hartley guinea pig model of spontaneous OA of the knee. METHODS: Knee joints of 46 male Hartley guinea pigs were analyzed at 3 weeks, 2, 4, 7, 10, 12, and 18 months of age for histological severity of OA, cartilage collagen fibril disruption by semi-quantitative polarized light microscopy, and expression of type II collagen degradation biomarkers, 9A4 and Coll2-1, by immunohistochemistry. In addition, serum biomarkers specific for collagen II degradation, CTX-II, C2C, and Coll2-1 were quantified. RESULTS: Collagen fibril disruption and expression of the collagenase-generated cleavage neoepitope, 9A4, were observed as early as 2 months of age, despite the appearance of histological OA at 4 months of age. Only serum Coll2-1 increased coincident with the early disruption of the collagen fibril between 3 weeks and 7 months, in contrast to serum C2C, which did not change significantly or correlate with histological severity. Inversely, CTX-II declined dramatically from 3 weeks to 4 months and remaining low thereafter, coincident with growth plate turnover. CONCLUSIONS: Collagenase cleavage and disruption of the type II collagen network are early OA disease events in this model, preceding histological evidence of proteoglycan loss. The markedly different serum profiles of collagen II-related biomarkers during the early stages of disease development suggest compartmental segregation and temporal regulation of collagen degrading enzymes. [less ▲]

Detailed reference viewed: 27 (4 ULiège)
Peer Reviewed
See detailCollagen heterogeneity in normal human bone marrow
Bentley, S. A.; Alabaster, O.; Foidart, Jean-Michel ULiege

in British Journal of Haematology (1981), 48(2), 287-91

Paraffin embedded sections of formalin fixed, decalcified, normal, human, vertebral bone were stained immunohistochemically for collagen types I, III and IV using the peroxidase--anti-peroxidase (PAP ... [more ▼]

Paraffin embedded sections of formalin fixed, decalcified, normal, human, vertebral bone were stained immunohistochemically for collagen types I, III and IV using the peroxidase--anti-peroxidase (PAP) technique. Preparations stained for collagen types I and III were virtually identical in appearance. These substrates were localized to the cytoplasm and fibrillar processes of a population of cells which were sparsely distributed within the haemopoietic compartment of the bone marrow, being particularly prominent in relation to the marrow sinusoids and fat spaces. They would thus appear to parallel the known distributions of reticulum cells, although their morphology differed in some respects from classical descriptions of the latter cell type. Type IV collagen was found in association with the endothelial lining of the sinusoids. Other connective tissue elements (bone, periosteum, endosteum, blood vessels, etc.) showed characteristic collagen heterogeneity. These results indicate that collagen is a significant component of the bone marrow connective tissue. [less ▲]

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See detailCollagen localization in normal and fibrotic human skeletal muscle.
Foidart, M.; Foidart, Jean-Michel ULiege; Engel, W. K.

in Archives of Neurology (1981), 38(3), 152-7

The distribution of types I to IV collagen, types I and III p-N collagen, and fibronectin in human skeletal muscle was studied by immunofluorescence using purified antibodies to those proteins. In normal ... [more ▼]

The distribution of types I to IV collagen, types I and III p-N collagen, and fibronectin in human skeletal muscle was studied by immunofluorescence using purified antibodies to those proteins. In normal muscle, types I and III collagen, types I and III p-N collagen, and fibronectin were localized in the endomysium and perimysium. Type IV collagen was restricted to basement membrane. Type II collagen was not present. In Duchenne's musclar dystrophy and dermatomyositis/polymyositis (DM/PM), the prominently increased endomysial and perimysial fibrosis consisted of types I and III collagen, types I and III p-N collagen, and fibronectin. In DM/PM, thickening of the walls of perimysial venular and arteriolar vessels was associated with accumulation of types I and III collagen, types I and III p-N collagen, and fibronectin, as well as type IV collagen. There was no disease-specific accumulation of collagen, p-N collagen, or fibronectin. [less ▲]

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Peer Reviewed
See detailCollagen synthesis in cultures of differentiating neural crest cells
Greenberg, J. H.; Foidart, Jean-Michel ULiege; Greene, R. M.

in Cell Differentiation (1980), 9(3), 153-63

Neural crest cells from the cranial region of chick embryos were cultured in the presence of fetal calf serum in which they differentiate into melanocytes or in the presence of horse serum in which they ... [more ▼]

Neural crest cells from the cranial region of chick embryos were cultured in the presence of fetal calf serum in which they differentiate into melanocytes or in the presence of horse serum in which they differentiate into neuron-like cells. Undifferentiated cultures, as well as pigmented and neuronal cultures, incorporated [14C]proline into types I and III collagen and into non-collagenous proteins. When cells differentiated into melanocytes, the ratio of collagen to non-collagenous protein did not change. In contrast, in cultures where a portion of the cells differentiated into neuron-like cells, the ratio of collagen to non-collagenous protein was reduced. Indirect immunofluorescence studies using specific antibodies against collagen or procollagen types I, II, III, and IV demonstrated that undifferentiated neural crest cells, melanocytes and neuron-like cells stained only with antibody to type III procollagen, while fibroblastic cells present in some cultures stained only with antibody to type I procollagen. Our results demonstrate that although the types of collagen synthesized by neural crest cells do not change with time in culture, the relative amounts of collagen may reflect the pathway of differentiation of the cells. [less ▲]

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Peer Reviewed
See detailCollagen, factor VIII antigen, and immunoglobulins in the human aqueous drainage channels.
Rodrigues, M. M.; Katz, S. I.; Foidart, Jean-Michel ULiege et al

in Ophthalmology (1980), 87(4), 337-45

Twenty-five trabeculectomy specimens from patients with primary open angle glaucoma and chronic angle closure glaucoma, and 11 age-matched controls were examined by immunofluorescence and immunoperoxidase ... [more ▼]

Twenty-five trabeculectomy specimens from patients with primary open angle glaucoma and chronic angle closure glaucoma, and 11 age-matched controls were examined by immunofluorescence and immunoperoxidase techniques to determine the types of collagen, immunoglobulins, and the presence of factor VIII-related antigen in the human aqueous drainage channels. In the glaucoma cases and in controls, we demonstrated that the electron dense basement membrane-like material in the peripheral portion of the trabecular beams and in the juxtacanalicular meshwork, consists at least in part, of type IV collagen, a noncollagenous protein ("laminin") and fibronectin. Factor VIII-related antigen was demonstrated in conjunctival vessels of the control eyes. Schlemm's canal and the trabecular endothelial cells did not stain for factor VIII-related/antigen in any of the specimens examined. No deposits of IgA, IgM, IgG, and the C3 component of complement were detected in the aqueous drainage channels. [less ▲]

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See detailCollagens and non collagenous proteins in the human eye. I. Corneal stroma in vivo and keratocyte production in vitro.
Benezra, D.; Foidart, Jean-Michel ULiege

in Current eye Research (1981), 1(2), 101-10

Human corneal stroma in situ and keratocyte activity in vitro were studied by the indirect immunofluorescent technique using highly purified antibodies to the various types of collagens, fibronectin and ... [more ▼]

Human corneal stroma in situ and keratocyte activity in vitro were studied by the indirect immunofluorescent technique using highly purified antibodies to the various types of collagens, fibronectin and laminin. Studying the localization of the various collagens in situ, it was observed that only type I collagen is present in the human corneal stroma. No positive immunofluorescence is obtained for type II or type III collagen. With type IV collagen, a bright immunofluorescence is observed at the level of Bowman's and Descemet's membranes. However, in vitro, the keratocyte cultures demonstrated the production of both type I and III collagens. No evidence for the production of type II or IV collagens was observed. Along with the collagens, human keratocytes in vitro also produced fibronectin. As for the non collagenous components of basement membrane (laminin), although a positive immunofluorescence was obtained the involvement of other cell-membrane glycoproteins in this reaction is not excluded. The possibility that a deregulation of type III collagen synthesis in vivo might be occurring also during certain pathologies and in corneal wound healing is postulated. [less ▲]

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See detailCollagens, laminin, fibronectin, and cytoskeletal composition of cells in syngeneic aortal vein grafts in the rat.
Stenmans, S.; Foidart, Jean-Michel ULiege; Paavolainen, P. et al

in Research in Experimental Medicine (1985), 185(5), 355-66

The supradiaphragmatic vena cava of the rat was transplanted to the abdominal aorta in syngeneic recipients. The cells and the connective tissue matrix of these grafts were studied 3 days to 12 weeks ... [more ▼]

The supradiaphragmatic vena cava of the rat was transplanted to the abdominal aorta in syngeneic recipients. The cells and the connective tissue matrix of these grafts were studied 3 days to 12 weeks after transplantation by immunofluorescence staining of the cytoskeletal proteins desmin, vimentin, and myosin. The matrix proteins, collagen Types I and III, laminin, fibronectin, and fibrin(ogen) were similarly demonstrated. Blood coagulation Factor VIII was used as a marker for endothelial cells. Inflammatory cells invaded the graft during Week 1, but later on the grafts were crowded with cells containing vimentin. Intimal thickenings developed already after 1 week. Smooth muscle cells containing desmin proliferated in these thickenings. After transplantation collagen Type I increased in the graft, but collagen Type III rather decreased. During the phase of intense proliferation of smooth muscle cells the media contained a rich matrix of diffusely distributed laminin. The laminin of older grafts was confined mostly to the subintimal zone and to the intimal plaques. [less ▲]

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See detailCollapse of concrete columns during and after the cooling phase of a fire
Dimia, Mohamed Salah; Guenfoud, Mohamed; Gernay, Thomas ULiege et al

in Journal of Fire Protection Engineering (2011), 21(4), 245263

This paper presents a study performed on the collapse of reinforced concrete columns subjected to natural fire conditions during and after the cooling phase of the fire. The aim is, first, to highlight ... [more ▼]

This paper presents a study performed on the collapse of reinforced concrete columns subjected to natural fire conditions during and after the cooling phase of the fire. The aim is, first, to highlight the phenomenon of collapse of concrete columns during and after the cooling phase of a fire and then, to analyze the influence of some determinant parameters. The main mechanisms that lead to this type of failure are found to be the delayed increase of the temperature in the central zones of the element and the additional loss of concrete strength during the cooling phase of the fire. A parametric study is performed considering different fires and geometric properties of the column. This shows that the most critical situations with respect to delayed failure arise for short fires and for columns with low slenderness or massive sections. [less ▲]

Detailed reference viewed: 213 (47 ULiège)
See detailCollapse-revivals and population trapping in the m-photon mazer
Bastin, Thierry ULiege; Solano, E.

Poster (2000)

Detailed reference viewed: 5 (1 ULiège)