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See detailLa tracabilite des viandes.
Portetelle, Daniel ULg; Renaville, Robert ULg

in Annales de Gembloux (1997), 103(1-2),

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See detailMulti-Cité, une expérience de formation initiale inédite
Beckers, Jacqueline ULg; Stegen, Pierre; Merenne-Schoumaker, Bernadette ULg et al

in Puzzle (1997), 2(juin), 10-16

L'article présente l'expérience de formation co-jointe de futurs professeurs de géographie de l'ULg et de la Haute Ecole Charlemagne via la réalisation d'un jeu pédagogique portant sur la gestion urbaine ... [more ▼]

L'article présente l'expérience de formation co-jointe de futurs professeurs de géographie de l'ULg et de la Haute Ecole Charlemagne via la réalisation d'un jeu pédagogique portant sur la gestion urbaine, jeu publié dans GEO 41. [less ▲]

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See detailLa localisation des productions agricoles : introduction méthodologique.
Merenne-Schoumaker, Bernadette ULg

in Bulletin de la Société Géographique de Liège (1997), (33), 129-138

First of all, the article specifies the links between agriculture and geography by emphasising both the speculiarities of the agricultural sector and the evolution of the problems concerning the ... [more ▼]

First of all, the article specifies the links between agriculture and geography by emphasising both the speculiarities of the agricultural sector and the evolution of the problems concerning the geographical researches dealing with the agricultural sector. Then, it defines the two main investigation areas of the agricultural geography : the analysis of the production distribution / sharing-out and the researches upon the factors and models of localisation. The two cases show how the authors endeavour to get devices that provide them a better understanding of the ever increasing complexity of the agricultural world. [less ▲]

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See detailCortical application of potassium chloride induces the low-molecular weight heat shock protein (Hsp27) in astrocytes.
Plumier, Jean-Christophe ULg; David, Jean-Claude; Robertson, H. A. et al

in Journal of Cerebral Blood Flow & Metabolism (1997), 17(7), 781-90

Spreading depression induces tolerance to ischemic injury, and ischemic tolerance has been associated with expression of heat shock proteins (Hsp). Here we examine Hsp27 expression after KCl-induced ... [more ▼]

Spreading depression induces tolerance to ischemic injury, and ischemic tolerance has been associated with expression of heat shock proteins (Hsp). Here we examine Hsp27 expression after KCl-induced spreading depression. Twenty-minute cortical KCl application induced Hsp27 immunoreactivity in glial fibrillary acidic protein-positive astrocytes of the ipsilateral neocortex. Systemic administration of MK-801 (3 mg/kg) suppressed KCl-induced Hsp27 expression in the parietal cortex. Astrocytes in the posterior cingulate and retrosplenial cortex did not express Hsp27 after KCl application but did express Hsp27 after systemic administration of high dose MK-801 (9 mg/kg). Whereas Hsp27 was usually observed in all layers of the parietal cortex after 5-minute application of KCl, in 2 of 6 rats, Hsp27 was seen in clusters of astrocytes or in astrocytes in the superficial layers I to III of the parietal cortex. We conclude that (1) cortical application of KCl triggered Hsp27 astrocytic expression; (2) astrocytes in the cingulate and retrosplenial cortex responded differently compared with astrocytes of the parietal cortex; (3) Hsp27 expression progressed from small clusters of astrocytes throughout superficial layers of the cortex that joined and recruited astrocytes in deeper layers; (4) several mechanisms induced Hsp27 astrocytic expression. We propose that Hsp27 is involved in spreading depression-induced ischemic tolerance through protection of astrocyte function. [less ▲]

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See detailTechnical validation of a face mask adapted for dry powder inhalation in the equine species
Duvivier, Dominique Hannia; Votion, Dominique ULg; Vandenput, Sandrina ULg et al

in Equine Veterinary Journal (1997), 29(6), 471-476

Development of dry powder inhalation (DPI) for horses requires the use of an adapted face mask. In experiment I, 4 masks (A, B, C and D) were tested and factors influencing the delivery of the dry powder ... [more ▼]

Development of dry powder inhalation (DPI) for horses requires the use of an adapted face mask. In experiment I, 4 masks (A, B, C and D) were tested and factors influencing the delivery of the dry powder were determined. Mask A was one which is commercially available for metered-dose inhalation. Mask B had the same shape as Mask A but an airtight rubber seal was added for the connection between the mask and horse's head. Mask C was a prototype adapted for DPI with connection for the DPI device between the nostrils, airtight expiratory valves in front of each nostril and airtight rubber seal to attach the mask on the horse's head. Mask D was the same as Mask C but the airtight expiratory valve was situated in front of one nostril and the connection for the DPI device was placed in front of the other nostril. Inhalet emptying and peak inspiratory pressure were measured on 5 healthy horses with each face mask. Both Masks A and B gave a low rate of inhalet emptying. Inspiratory pressures created in Masks C and D were negative enough to ensure inhalet emptying rates of mean +/- s.d. 98.28 +/- 1.79% and 100% respectively. In experiment 2, the face masks giving the greatest inhalet emptying were used to test the therapeutic efficacy of ipratropium bromide DPI. This was tested on 6 horses suffering from acute exacerbation of chronic obstructive pulmonary disease (COPD). At a dose of 200 micrograms/100 kg bwt, ipratropium administered with Mask D improved significantly pulmonary function measurements compared to baseline values and placebo inhalation. With Mask C, a double dose of ipratropium (400 micrograms/100 kg bwt) was necessary to improve these parameters compared to baseline values. This indicated the importance of locating the DPI device in front of one nostril. It was concluded that inhalet emptying is correlated to inspiratory pressures measured in the face masks. Secondly, these pressures are in turn dependent on the air-tightness of the mask, i.e. air-tightness of the expiratory valve and close connection between the horse's head and the mask. Thirdly, position of the DPI device in front of a nostril allows bronchodilation at a dose half that required when the device is placed between the nostrils. Finally DPI using Mask D (EquiPoudre) is a rapid, effective and well tolerated inhalation treatment for COPD horses. [less ▲]

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See detailToxicological investigations on four sperm whales stranded on the Belgian coast: inoganic contaminants
Bouquegneau, Jean-Marie ULg; Debacker, Virginie ULg; Gobert, Sylvie ULg et al

in Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre (1997), 67

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See detailReprésentation de l'espace ouvert dans un système d'information de projet urbain
Dupagne, A.; Teller, Jacques ULg

in Ingénierie des Systèmes d'Information (1997), 5(2), 219-240

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See detailPrevalence and characterization of Microsporum canis carriage in cats.
Mignon, Bernard ULg; Losson, Bertrand ULg

in Journal of Medical and Veterinary Mycology : Bi-Monthly Publication of the International Society for Human and Animal Mycology (1997), 35(4), 249-256

In order to determine the prevalence and to characterize the carriage of Microsporum canis in cats, different mycological examinations (including a culture obtained by hair brushing and Wood's light ... [more ▼]

In order to determine the prevalence and to characterize the carriage of Microsporum canis in cats, different mycological examinations (including a culture obtained by hair brushing and Wood's light examination) were performed on 632 animals of different origins. Group 1 comprised 467 healthy pet cats belonging to veterinary students. In this group, prevalence of carriage was 2.1%: eight cats were asymptomatic transient carriers and one cat was an asymptomatic infected animal presenting discrete Wood's-positive lesions disseminated on the whole body that were visible after sedation and clipping. The carriage prevalence was higher (15.7%) in group 2 comprising 134 European cats destroyed in a pound and kept together. In two additional groups of cats, it was shown that an infected cat was responsible for the dissemination of fungal material into its environment including the other in-contact animals. When the active source of fungus was removed, the dissemination stopped, resulting in a decrease in the amount of infective material recovered from both the animal carriers and the environmental surfaces. This was also observed in two experimental groups of guinea pigs. No association between feline immunodeficiency virus infection and the M. canis carriage was observed in a retrospective case-control study performed on group 2. None of these cats was feline leukaemia virus positive. [less ▲]

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See detailCompte rendu du Cahier de Linguistique française, n°14 : Lexique et pragmatique
Defays, Jean-Marc ULg

in Français Moderne (Le) (1997), (2), 239-244

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See detailPhysical activity, obesity, and cardiovascular risk factors in children. The Belgian Luxembourg Child Study II.
Guillaume, Michèle ULg; Lapidus, L.; Bjondorp, P. et al

in Obesity Research (1997), 5(6), 549-56

Physical activity was measured in relation to cardiovascular (CV) risk factors in a randomly selected population of 1028 children from Province de Luxembourg in Belgium, a mainly rural area with a high ... [more ▼]

Physical activity was measured in relation to cardiovascular (CV) risk factors in a randomly selected population of 1028 children from Province de Luxembourg in Belgium, a mainly rural area with a high prevalence of such risk factors among adults and children. Physical activity was estimated as participation in sport activities, a major indicator of leisure-time physical activity in schoolchildren, and physical inactivity was estimated as frequency and duration of television (TV) watching. Boys participated more frequently in sport activities than girls did (p = 0.001). A majority of the children watched TV daily. After age adjustment, bodyweight (girls, p < 0.012; boys, p < 0.027) and, in boys, body mass index (BMI) (p < 0.039) were related to days per week of TV watching. No significant relationships with other CV risk factors remained after adjustments for BMI. In analyses of independent contributions of age, TV watching, and sports activity on CV risk factors, age showed highly significant relationships. In boys, TV showed relationships with BMI (p < 0.04) and (borderline) with systolic blood pressure, independent of age and sports activity, whereas the latter was significantly related to subscapular skinfold (p < 0.04) and (borderline) with triceps skinfold and cholesterol. In girls, no significant independent contributions to risk factor associations were found. The father's education was directly associated with sports activities, whereas the mother being a housewife showed negative relationships to physical activity and positive to TV watching in their children, suggesting socioeconomic influence on the activity patterns of children. Furthermore, registrations suggested less physical activity in the most rural part of the area. It is concluded that children in this mainly rural area watch TV frequently. In boys, physical inactivity, measured both as TV watching and as registrations of sports activities, contributes independently to body fat mass. In girls, no contribution or weaker contributions of physical inactivity were found. This suggests that contributory factors leading to obesity might be different in girls and boys. [less ▲]

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See detailLesions observed on stranded seabirds along the Belgian coast from 1992 to 1995
Jauniaux, Thierry ULg; Brosens, L.; Coignoul, Freddy ULg

in ICES Journal of Marine Science (1997), 54(4), 714-717

From 1992 to 1995, dead seabirds found on Belgian beaches were collected and various tissues of 241 birds were sampled for histopathological, bacteriological, parasitological, and toxicological ... [more ▼]

From 1992 to 1995, dead seabirds found on Belgian beaches were collected and various tissues of 241 birds were sampled for histopathological, bacteriological, parasitological, and toxicological investigations. The most common species examined was the guillemot (Uria aalge). Necropsies revealed cachexia (severe emaciation), acute haemorrhagic gastro-enteropathy and oil contamination in many of these birds. Statistical analyses were performed in order to explore correlations of these with biological parameters such as age, sex, and origin (pelagic or non-pelagic). The pelagic origin of seabirds were associated with the three main findings. Oil contamination was associated with acute gastro-enteropathy and cachexia, and cachexia was more prevalent among juveniles. Finally, cachexia and acute gastro-enteropathy were strongly associated. It is possible that oiled pelagic seabirds become cachectic and die of acute gastro-enteropathy. (C) 1997 International Council for the Exploration of the Sea. [less ▲]

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See detailMetacognitive realism : A cognitive style or a learning strategy ?
Jans, Véronique; Leclercq, Dieudonné ULg

in Educational Psychology (1997), 17(1-2), 101-110

Learning implies the learner's ability to make a series of decisions and, in particular, the capacity to assess the quality and reliability of one's own knowledge incapsulated in the question: 'How far do ... [more ▼]

Learning implies the learner's ability to make a series of decisions and, in particular, the capacity to assess the quality and reliability of one's own knowledge incapsulated in the question: 'How far do I already know the content I am supposed to learnt?' The authors address the following issues: (1) Is realism in metacognition a stable trait in learners?; (2) If not, by what is it influenced?. After a short review of the literature on the topic and the examination of experimental evidence, metacognition is considered as both a style and a strategy. The need for a taxonomy of metacognitive realism is demonstrated in order to clarify the topic and to facilitate applied research. [less ▲]

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See detailIntoxications par le Temik® chez les animaux domestiques et sauvages : un problème alarmant en Wallonie
Delaunois, Annie; Lessire, Françoise ULg; Ansay, M. et al

in Annales de Médecine Vétérinaire (1997), 141

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See detailLe Système d'informations sur la Biodiversité en Wallonie.
Dufrêne, Marc ULg

in Les cahiers des Réserves Naturelles RNOB (1997), 11

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See detailCompte rendu de l'ouvrage de Th. Bardinet, Les papyrus médicaux de l'Egypte pharaonique, Paris, 1995
Marganne, Marie-Hélène ULg

in Archives Internationales d'Histoire des Sciences (1997), 47(139 bis), 139-141

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See detailEffects of meloxicam compared to acetylsalicylic acid in human articular chondrocytes
Bassleer, Corinne; Magotteaux, Jacques ULg; Geenen, Vincent ULg et al

in Pharmacology (1997), 54

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See detailCompte rendu de L.I. Conrad - M. Neve - V. Nutton - R. Porter - A. Wear, The Western Medical Tradition: 800 BC to AD 1800, Cambridge, 1995
Marganne, Marie-Hélène ULg

in Archives Internationales d'Histoire des Sciences (1997), 47(139 bis), 153-154

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See detailOverhead Lines galloping and turbulent wind
Chabart, Olivier; Lilien, Jean-Louis ULg

in Bulletin Scientifique de l'Association des Ingénieurs Electriciens sortis de l'Institut Electrotechnique Montefiore (1997), 1

Galloping is modelled considering actual turbulent wind using frequency spectrum of the wind and spatial coherence.

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See detailcDNA cloning and expression of bovine procollagen I N-proteinase: a new member of the superfamily of zinc-metalloproteinases with binding sites for cells and other matrix components.
Colige, Alain ULg; Li, S. W.; Sieron, A. L. et al

in Proceedings of the National Academy of Sciences of the United States of America (1997), 94(6), 2374-9

Procollagen N-proteinase (EC 3.4.24.14) cleaves the amino-propeptides in the processing of type I and type II procollagens to collagens. Deficiencies of the enzyme cause dermatosparaxis in cattle and ... [more ▼]

Procollagen N-proteinase (EC 3.4.24.14) cleaves the amino-propeptides in the processing of type I and type II procollagens to collagens. Deficiencies of the enzyme cause dermatosparaxis in cattle and sheep, and they cause type VIIC Ehlers-Danlos syndrome in humans, heritable disorders characterized by accumulation of pNcollagen and severe skin fragility. Amino acid sequences for the N-proteinase were used to obtain cDNAs from bovine skin. Three overlapping cDNAs had an ORF coding for a protein of 1205 residues. Mammalian cells stably transfected with a complete cDNA secreted an active recombinant enzyme that specifically cleaved type I procollagen. The protein contained zinc-binding sequences of the clan MB of metallopeptidases that includes procollagen C-proteinase/BMP-1. The protein also contained four repeats that are homologous to domains found in thrombospondins and in properdin and that can participate in complex intermolecular interactions such as activation of latent forms of transforming growth factor beta or the binding to sulfatides. Therefore, the enzyme may play a role in development that is independent of its role in collagen biosynthesis. This hypothesis was supported by the observation that in some tissues the levels of mRNA for the enzyme are disproportionately high relative to the apparent rate of collagen biosynthesis. [less ▲]

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See detailProtéinas placentárias em mamíferos
Melo de Sousa, Noelita; de Figueiredo, José Ricardo; Gonçalves, Paulo Bayard Dias et al

in Ciência Animal (1997), 7(1), 43-55

During the past twenty years, several new placental proteins have been isolated and characterized in woman and several animal species. Among these proteins, it can be mentioned chorionic gonadotrophins ... [more ▼]

During the past twenty years, several new placental proteins have been isolated and characterized in woman and several animal species. Among these proteins, it can be mentioned chorionic gonadotrophins, placental lactogens, interferon tau, pregnancy specific and pregnancy-associated glycoproteins. In spite of the importance of these studies, there are few papers that describe fundamental aspects of these placental proteins such as physical-chemical pregnancy diagnosis methods. Thus, the aim of this report is to present an overview on the major aspects of placental proteins studied up to now, as well as to consider perspectives for their applications in the future in veterinary practice. [less ▲]

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See detailFatal Mural Endocarditis and Cutaneous Botryomycosis after Heart Transplantation
Defraigne, Jean-Olivier ULg; Demoulin, J. C.; Pierard, Gérald ULg et al

in American Journal of Dermatopathology (1997), 19(6), 602-5

Fatal mural endocarditis and botryomycosis occurred concurrently in a 62-year-old women 4 months after orthotopic heart transplantation. Subsequent to mild mitral regurgitation, infection developed on a ... [more ▼]

Fatal mural endocarditis and botryomycosis occurred concurrently in a 62-year-old women 4 months after orthotopic heart transplantation. Subsequent to mild mitral regurgitation, infection developed on a left atrial thrombus and was complicated by cerebral embolization. Simultaneously, skin nodules manifested on both forearms. Histologic examination revealed typical aspects of early evolving botryomycosis with massive infiltration of the dermis and hypodermis by necrotic granulomas framed by grains of Gram-positive coccoid forms. Bacteria were decorated by a nonspecific polyclonal antibody to Mycobacterium bovis. [less ▲]

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See detailRuptured Aneurysm of the Profunda Femoral Artery Associated with Polyaneurysmal Disease
Defraigne, Jean-Olivier ULg; Vasquez, C.; Limet, Raymond ULg

in Acta Chirurgica Belgica (1997), 97(2), 93-6

A 73-year-old man was admitted for rupture of an atherosclerotic aneurysm of the profunda femoris artery associated to popliteal and bilateral axillary arteries aneurysms. The aneurysm of the profunda ... [more ▼]

A 73-year-old man was admitted for rupture of an atherosclerotic aneurysm of the profunda femoris artery associated to popliteal and bilateral axillary arteries aneurysms. The aneurysm of the profunda femoris artery was developed between the branches of the crural nerves. Considering the patency of the superficial femoral artery and of the leg arterie, and to avoid injury to the crural nerve, no reconstruction of the profunda femoris was attempted. The aneurysm was ligated proximally and buttress sutures were placed on the site of rupture to achieve thrombosis of the aneurysms. Most of the published cases of aneurysm of the profunda femoris artery are false aneurysms developed after various trauma. Atherosclerotic aneurysm of the profunda femoris artery is a rare lesion and rupture is exceptional. [less ▲]

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See detailRyle et la phénoménologie
Leclercq, Bruno ULg

in Recherches Husserliennes (1997), 7

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See detailLes peuplements à graines. Concept, réglementations et mise en oeuvre.
Vanslembrouck, C.; Rondeux, Jacques ULg

in Silva Belgica (1997), 104(4), 17-21

La rentabilité de la propriété forestière qui, dans une large mesure, conditionne la pérennité des forêts gérées intensivement fait de plus en plus l'objet des préoccupations des chercheurs, sylviculteurs ... [more ▼]

La rentabilité de la propriété forestière qui, dans une large mesure, conditionne la pérennité des forêts gérées intensivement fait de plus en plus l'objet des préoccupations des chercheurs, sylviculteurs, gestionnaires et responsables des politiques forestières. Dans ce contexte, lorsqu'il s'agit de la création et de l'enrichissement de peuplements, veiller à respecter la meilleure adéquation possible entre le sol et l'essence n'est pas tout, encore faut-il ensuite utiliser un matériel génétique de qualité en particulier lors de régénérations artificielles. C'est à ce dernier point, et plus particulièrement aux peuplements à graines, que les lignes suivantes sont consacrées. Nous envisagerons successivement ce qu'il convient communément d'entendre par peuplement à graines (§ 2), sa raison d'être (§ 3) et le processus d'identification de celui-ci (§ 4) avant de tirer quelques brèves conclusions. [less ▲]

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See detailLa bryoflore d'une forêt alluviale fonctionnelle: la réserve naturelle rhénane de l'Ile de Rhinau (Bas-Rhin, France)
Klein, J. P.; Siebel, H.; Vanderpoorten, Alain ULg

in Mitteilungen des Badischen Landesvereins für Naturkunde und Naturschutz (1997), 16

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See detailGluonic content of the scalar meson nonet in a scaled effective Lagrangian
Jaminon, Martine ULg; Van den Bossche, Bruno

in Nuclear Physics A (1997), 619

A scaled SU(3) Nambu-Jona-Lasinio Lagrangian is used to compute the mass of the nine scalar mesons in the vacuum and the mass of the glueball. This chiral model provides a gluonic content to the scalar ... [more ▼]

A scaled SU(3) Nambu-Jona-Lasinio Lagrangian is used to compute the mass of the nine scalar mesons in the vacuum and the mass of the glueball. This chiral model provides a gluonic content to the scalar mesons as well as a quark content to the glueball. It is shown that a suitable choice of the vacuum gluon condensate allows reproduction of the experimental masses of the scalar mesons except for K*0(1430). This choice corresponds to a weak coupling between the gluon and quark condensates, giving f0(1500) or fJ(1710) which is nearly a pure glueball. [less ▲]

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See detailDes auteurs dans les ruines. Parcours arbitraire
Delhalle, Nancy ULg

in Alternatives Théâtrales (1997)

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See detailFamilial Crohn's Disease: A Study of 18 Families
Franchimont, D.; Belaiche, Jacques ULg; Louis, Edouard ULg et al

in Acta Gastro-Enterologica Belgica (1997), 60(2, Apr-Jun), 134-7

The high frequency of familial Crohn's disease (CD) suggests a genetic predisposition. The most recent data from epidemiology and molecular biology are consistent with a multifactorial, polygenic ... [more ▼]

The high frequency of familial Crohn's disease (CD) suggests a genetic predisposition. The most recent data from epidemiology and molecular biology are consistent with a multifactorial, polygenic inheritance with a possible genetic heterogeneity. The aim of our study was, first to compare familial and sporadic CD on the basis of the type and location of the disease, and age at diagnosis, and second, to evaluate among families, the concordance rate for the type and location of the disease. PATIENTS AND METHODS: 18 families with 2 (n = 16) and 3 (n = 2) affected first degree relatives were studied. They were compared to a population of 154 sporadic CD coming from the same gastroenterology unit. RESULTS: Age at diagnosis was the same in sporadic and familial CD. There was an increased frequency of ileal (p = 0.02), and fibro stenotic (p = 0.005) CD and a decreased frequency of colonic (p = 0.006) and inflammatory (p = 0.02) disease, in familial CD. There was a significant increase in concordance rate for fibrostenotic disease (p < 0.001) and a decrease for inflammatory disease (p < 0.01), among the families. The observed concordance rate for the location of the disease was not significantly different from the expected one. In conclusion, these data suggest that CD may be heterogenous and that different clinical patterns may be determined either by genetic or environmental factors. [less ▲]

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See detailSequence Analysis of the Bovine Herpesvirus Type 1 Genes Homologous to the DNA Polymerase (Ul30), the Major DNA-Binding Protein (Ul29) and Icp18.5 Assembly Protein (Ul28) Genes of Herpes Simplex Virus
Meyer, Gilles; Vlcek, C.; Paces, V. et al

in Archives of Virology (1997), 142(1), 89-102

The nucleotide sequence of a 10.5 kb region (map position 0.332 to 0.410) of bovine herpesvirus type 1 (BHV-1) was determined. This region contained three open reading frames (ORFs) homologous to herpes ... [more ▼]

The nucleotide sequence of a 10.5 kb region (map position 0.332 to 0.410) of bovine herpesvirus type 1 (BHV-1) was determined. This region contained three open reading frames (ORFs) homologous to herpes simplex virus DNA polymerase catalytic subunit (DNApol, UL30), major DNA-binding protein (MDBP, UL29) and ICP18.5 assembly protein (ICP18.5, UL28). The BHV-1 DNApol. MDBP and ICP18.5 ORFs were 1246, 1203 and 826 amino acids long with a calculated molecular mass of 134.2 kDa, 124.4 kDa and 86.9 kDa, respectively. They showed a high homology with alphaherpesvirus homologs despite large differences in the G + C content of the UL30-UL28 segment ranging from 44.4% for varicella zoster virus to 71.5% for BHV-1. Particularly well conserved among Alphaherpesvirinae are the putative functional domains of the DNApol and MDBP proteins which are discussed. Phylogenetic analysis revealed that BHV-1 clustered in the Varicellovirus genus with the animal D-type viruses. In this group, the BHV-1 position was shown to vary according to the investigated genes. Indeed, pseudorabies virus clustered with BHV-1 in the DNApol tree but with equine herpesvirus 1 in the ICP18.5 tree. [less ▲]

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See detailOrigine sociale et réussite scolaire : un modèle en Chaîne de Markov estimé sur données individuelles belges
Donni, Olivier; Lejeune, Bernard ULg

in Recherches Economiques de Louvain (1997), 63(4), 421-446

Cet article étudie les relations entre l'origine socio-économique des élèves belges et leur parcours scolaire primaire et secondaire. Il repose sur l'hypothèse que le parcours scolaire des élèves peut ... [more ▼]

Cet article étudie les relations entre l'origine socio-économique des élèves belges et leur parcours scolaire primaire et secondaire. Il repose sur l'hypothèse que le parcours scolaire des élèves peut être décrit par un processus de Markov. Sur la base d'un échantillon transversal d'un millier d'enfants, en fonction de variables socio-économiques et pour chacune des années de scolarité obligatoire, les probabilités individuelles de poursuivre un parcours scolaire ''normal'', c.-à-d. sans redoublement ni relégation dans une filière de second choix, sont estimées. Nos résultats montrent que derrière les substantiels taux agrégés de redoublement qui caractérisent le système scolaire belge se cachent en fait de profondes inégalités sociales. [less ▲]

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See detailClinical characteristics, prognosis and treatment for pelvic cryptorchid seminoma
Li; COUCKE, Philippe ULg; Qian et al

in International Journal of Radiation, Oncology, Biology, Physics (1997), 38(2), 351-357

Purpose: To analyze the clinical characteristics, prognosis, and treatment outcome of pelvic cryptorchid seminoma (PCS), and to determine whether whole abdominal-pelvic irradiation for Stage I disease is ... [more ▼]

Purpose: To analyze the clinical characteristics, prognosis, and treatment outcome of pelvic cryptorchid seminoma (PCS), and to determine whether whole abdominal-pelvic irradiation for Stage I disease is necessary. Methods and Materials: From 1958 to 1991,60 patients with PCS were treated at the Cancer Hospital of Chinese Academy of Medical Sciences, Beijing. They presented with a lower abdominal mass and showed a predominance for the right side. A high proportion of patients with PCS [ 26 of 60 (43% )] had metastatic disease, compared to 20% of those with scrotal seminoma, and there was a tendency toward a higher frequency of pelvic nodal metastases. There were 34 Stage I, 6 Stage IIA, 11 Stage IIB, 5 Stage III, and 4 Stage IV patients. Of these 60 patients, 56 underwent laparotomy with or without cryptorchiectomy (37 radical orchiectomy, 7 partial orchiectomy, and 12 biopsy of the primary or cervical node), and 4 cervical node biopsy only. All patients were further treated with radiotherapy, chemotherapy, or a combination of both. Patients with Stage I and II disease received radiotherapy, whereas patients with Stage III and IV were treated with chemotherapy. Results: The overall and disease-free survivals at 5 and 10 years were 92% and 87%, and 88% and 84%, respectively. The 5- and lo-year survivals were 100% for Stage I, 94% and 87% for Stage II, and 56% and 42% for Stage III/IV, respectively @ < 0.05). Volume of irradiation, i.e., whole abdominal-pelvic radiotherapy ( 10 patients), versus hockey-stick encompassing paraaortic, ipsilateral iliac nodes and the primary tumor or tumor bed (17) did not influence outcome in Stage I patients. Five patients relapsed within 2-12 years after treatment, and four of these patients were successfully salvaged. Four patients developed a second malignant tumor and died. Conclusion: Stage I and II PCS can he adequately controlled by radiotherapy regardless of the surgical procedure. Whole abdominal-pelvic irradiation for Stage I and IIA disease is not required, and fields can be limited to the paraaortic, ipsilateral iliac nodes and primary tumor or tumor bed. We recommend platinum-based chemotherapy for Stage IIB-IV PCS. 0 1997 Elsevier Science Inc. [less ▲]

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See detailPromoter swapping between the genes for a novel zinc finger protein and beta-catenin in pleiomorphic adenomas with t(3;8)(p21;q12) translocations.
Kas, K.; Voz, Marianne ULg; Roijer, E. et al

in Nature Genetics (1997), 15(2), 170-4

Pleiomorphic adenoma of the salivary glands is a benign epithelial tumour occurring primarily in the major and minor salivary glands. It is by far the most common type of salivary gland tumour ... [more ▼]

Pleiomorphic adenoma of the salivary glands is a benign epithelial tumour occurring primarily in the major and minor salivary glands. It is by far the most common type of salivary gland tumour. Microscopically, pleiomorphic adenomas show a marked histological diversity with epithelial, myoepithelial and mesenchymal components in a variety of patterns. In addition to a cytogenetic subgroup with normal karyotypes, pleiomorphic adenomas are characterized by recurrent chromosome rearrangements, particularly reciprocal translocations, with breakpoints at 8q12, 3p21, and 12q13-15, in that order of frequency. The most common abnormality is a reciprocal t(3;8)(p21;q12). We here demonstrate that the t(3;8)(p21;q12) results in promoter swapping between PLAG1, a novel, developmentally regulated zinc finger gene at 8q12, and the constitutively expressed gene for beta-catenin (CTNNB1), a protein interface functioning in the WG/WNT signalling pathway and specification of cell fate during embryogenesis. Fusions occur in the 5'-non-coding regions of both genes, exchanging regulatory control elements while preserving the coding sequences. Due to the t(3;8)(p21;q12), PLAG1 is activated and expression levels of CTNNB1 are reduced. Activation of PLAG1 was also observed in an adenoma with a variant translocation t(8;15)(q12;q14). Our results indicate that PLAG1 activation due to promoter swapping is a crucial event in salivary gland tumourigenesis. [less ▲]

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See detailDiagenetic and paleogeographic significance of clay and other sedimentary components in the middle Devonian limestones of Western Ardennes, France
Chamley, H.; Proust, J. N.; Mansy, J. L. et al

in Palaeogeography, Palaeoclimatology, Palaeoecology (1997), 129

Givetian deposits accumulated in a more than 300-m-thick succession on a carbonate platform developed on the passive margin of the so-called Rheic ocean. These rocks crop out in the Ardenne massif at ... [more ▼]

Givetian deposits accumulated in a more than 300-m-thick succession on a carbonate platform developed on the passive margin of the so-called Rheic ocean. These rocks crop out in the Ardenne massif at Glageon in a structural context marked by small fault-controlled basins subjected to moderate overburden, tectonic and metamorphic constraints. Data on the clay mineral distribution, associated with detailed information on limestone facies/microfacies, as well as data on the depositional profile and sequence stratigraphic evolution of these rocks indicate strong carbonate diagenesis and moderate clay diagenesis, the latter being favoured by the early occurrence of the former, which prevented further fluid-rock interaction. The clay assemblage distribution, which roughly parallels the palaeomorphologic and palaeobathymetric shape of the Givetian continental margin, is organized in five successive zones indicating large-scale sequence stratigraphic evolution and the control of regional sea-level fluctuations. The clay and other sedimentary components provide additional information on the warm and variably humid climate, northern, relative to southern, terrigenous sources, the open sea relative to restricted depositional environments, the temporary tectonic rejuvenation of the continental hinterland and the chemical conditions allowing early diagenetic modifications. [less ▲]

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See detailLoss of calcyphosin gene expression in mouse and other rodents
Clément, S.; Dumont, J.; Schurmans, Stéphane ULg

in Biochemical and Biophysical Research Communications (1997), 232

alcyphosine-for calcium binding and regulated by cyclic AMP through phosphorylation protein-is a target of both the cyclic AMP and the Ca(+2)-phophatidylinositol cascades first isolated from dog thyroid ... [more ▼]

alcyphosine-for calcium binding and regulated by cyclic AMP through phosphorylation protein-is a target of both the cyclic AMP and the Ca(+2)-phophatidylinositol cascades first isolated from dog thyroid, and then from rabbit and human brain. Although the exact function of this 24kD protein is unknown, calcyphosine could be implicated in the cross-signaling between these cascades to coordinate cellular proliferation and differentiation. Here, we report the sequence of a pseudogene which is the murine calcyphosine homologue, and demonstrate that it represents the unique sequence homologous to the dog calcyphosine gene in the murine genome. The lack of expression of this murine pseudogene in brain and thyroid-two major sites of dog calcyphosine expression-was extended to 5 other rodents, and suggest the existence of alternative pathway(s) to fill the function of calcyphosine in rodents [less ▲]

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See detailAdjusting to changes in the time of reinforcement: peak-interval transitions in rats.
Lejeune, H.; Ferrara, André ULg; Simons, F. et al

in Journal of Experimental Psychology. Animal Behavior Processes (1997), 23(2), 211-31

Thirty rats received training on a peak-interval procedure, where a baseline with a 20-s time of reinforcement was interspersed among cyclic transitions to other reinforcement time values (10, 20, 30, or ... [more ▼]

Thirty rats received training on a peak-interval procedure, where a baseline with a 20-s time of reinforcement was interspersed among cyclic transitions to other reinforcement time values (10, 20, 30, or 40 s), each of which was either in force for only a single session or for 3 sessions. Peak times were close to the time of reinforcement on the 20-s baseline and tracked the new reinforcement times both closely (but not exactly) and very rapidly. Peak time during transitions was affected by the criterion value in force on the previous session, exhibiting a proactive interference effect. Analysis of individual peak times during a session showed that transitions from lower to higher reinforcement time values were usually characterized by abrupt jumps in peak time, whereas descending transitions were mostly smooth but rapid. [less ▲]

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See detailExploitation of trispecific hybrids to introgress the glandless seed and glanded plant trait of Gossypium sturtianum Willis into G. hirsutum L.
Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg; Vroh Bi, I.

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (1997), 1(4),

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See detailRheological characterization on the BaTiO3 sol-gel transition
Van Cantfort, Olivier; Brasseur, Alain; Michaux, Bernard et al

in Faraday Discussions (1997), 101

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See detailMultiple seawater-derived geochemical signatures in Indian oceanic pelagic clays
Fagel, Nathalie ULg; André, Luc; Debrabant, Pierre

in Geochimica et Cosmochimica Acta (1997), 61(5), 989-1008

This paper reports a geochemical study of oceanic clays. Major and trace elements were analyzed on smectite-rich, clay size (<2 mu m) samples, bulk sediments, and leachate residues from the Central Indian ... [more ▼]

This paper reports a geochemical study of oceanic clays. Major and trace elements were analyzed on smectite-rich, clay size (<2 mu m) samples, bulk sediments, and leachate residues from the Central Indian Basin. Sr-Nd isotopes were also studied to investigate their geochemical evolution during transport in the water column, sedimentation, and diagenesis. The region is of special interest because the sedimentation records the interaction between the detrital supply from the Bengal Fan in the north and the biosiliceous input associated with the equatorial divergence in the south. The clay size fractions display extremely variable trace element contents, e.g., [Ba] = 100-5000 ppm, [Sr] = 20-200 ppm, Ce/Ce* = 0.9-3.3, [Nd] = 10-50 ppm. Although in the argillaceous samples, clay size fractions have a similar trace element imprint to the bulk sediment, some major fractionations occur in the biosiliceous samples between the clay and the bulk sediment, especially for Sr and rare earth elements (REE). Three major components may account for the variable geochemical signatures of these pelagic clays. The first component (component A), already identified by Fagel et al. (1994), is characterized by a homogeneous geochemical signature (La-N/Yb-N = 1.03-1.05; Th/Ta = 12.8-21.1; Ba/Th similar to 28) and a nonradiogenic Nd isotopic composition (Nd-143/Nd-144 similar to 0.511880): it traces a detrital Himalayan-derived origin. The two other components display a seawater-derived isotopic composition with global Sr (Sr-87/Sr-86 similar to 0.709060) and regional Indian Ocean Nd(Nd-143/Nd-144 similar to 0.512200) signatures. Both components are enriched in Sr and Ba (Sr similar to 150 ppm, Ba/Th similar to 500), and they are either enriched in light rare earth elements (LREE, e.g., Nd similar to 50 ppm) in the argillaceous sediments (component B) or LREE-depleted (Nd < 20 ppm) in the biosiliceous sediments (component C). The frequent occurrence of micrometric (<5 mu m) Sr-REE-Th enriched barite grains showing three major habits (rhombic, rounded, dendritic) suggests that these biologically-derived mineral phases had a major role in the genesis of components B and C. A strong clay-barite equilibration is deduced from the Post Archean Australian Shales PAAS-like REE patterns of these barites and the Ba enrichment of the clays. We suggest that it results from two successive mechanisms of exchange. First, at the top of the oxygen minimum zone, the microbial-induced decay of organic matter is proposed to trigger a series of trace element transfers between the various particulate-forming components (clays, barites, and decaying organic coatings). This is proposed as the origin of the clay component B: the barite-derived components (Ba, Sr) and the organic-derived positive Ce anomaly are imported to the clay particles while the PAAS signature of the clays is retained by the remaining barite crystals. Second, after settling, the barites are believed to partly dissolve and recrystallize, especially in the anoxic part of the sedimentary column. This diagenetic barite dissolution is proposed as the origin of the clay component C. Copyright (C) 1997 Elsevier Science Ltd. [less ▲]

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See detailTextural properties and thermal stability of silica-zirconia aerogels
Pirard, René ULg; Bonhomme, Damien; Kolibos, Sofia et al

in Journal of Sol-Gel Science and Technology (1997), 8

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See detailCharacterization of CuInTe2 thin films prepared by flash evaporation
Boustani, M.; El Assali, K.; Bekkay, T. et al

in Semiconductor Science & Technology (1997), 12

Thin films of CuInTe2 were grown by flash evaporation. The influence of the substrate temperature Ts during film deposition on the properties of the thin films was examined. CuInTe2 films were ... [more ▼]

Thin films of CuInTe2 were grown by flash evaporation. The influence of the substrate temperature Ts during film deposition on the properties of the thin films was examined. CuInTe2 films were structurally characterized by the grazing incidence x-ray diffraction (GIXD) technique. Investigation by this technique demonstrates that the surface of thin films of CuInTe2 prepared by flash vaporation at Ts > 100 °C exhibits the chalcopyrite structure with additional binary compounds in the surface. However, in the volume the films exhibit the chalcopyrite structure only; no foreign phases were observed. X-ray reflectometry was utilized to evaluate the critical reflection angle bc of CuInTe2 (bCuInTe2 c 0.32°) which permitted us to calculate the density of the films to be 6 g cm−3. The evaporated films were p type and the films deposited at Ts = 100 °C had a resistivity in the range 0.3–2 cm. From optical measurements we have determined the optical energy gap Eg 0.94 eV and the effective reduced mass m*r 0.07me . [less ▲]

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See detailPhysical activity and cardiovascular risk factors in children. The Belgian Luxembourg Child Study.
Guillaume, Michèle ULg; Lapidus, L.; Bjorntorp, P.

in Obesity Research (1997)

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See detailHydrostatic flattening, core structure, and translational mode of the inner core
Denis, Carlo; Rogister, Yves; Amalvict, Martine et al

in Physics of the Earth & Planetary Interiors (1997), 99(3-4), 195-206

Modern Earth models are constrained by an inertia coefficient y*=J(2)/H approximate to 0.3308 which leads to a so-called 'hydrostatic' flattening f(hyd) approximate to 1/299.9. The latter is in rather ... [more ▼]

Modern Earth models are constrained by an inertia coefficient y*=J(2)/H approximate to 0.3308 which leads to a so-called 'hydrostatic' flattening f(hyd) approximate to 1/299.9. The latter is in rather large disagreement with the observed flattening f approximate to 1/298.3. We show that a more satisfactory value of the inertia coefficient for constraining a standard Earth model is y approximate to 0.332, consistent with a hydrostatic flattening of about 1/298.6. The change of the value of the inertia coefficient from about 0.331 to about 0.332 significantly alters the density structure of the core, notably the density jump at the inner core boundary. It brings, as a by-produce, the hydrostatic values of J(2) and H to better agreement with the observed values than is presently thought, and most probably leads for the Slichter mode to a period of much longer than 5.42 h, which is the value computed for PREM. [less ▲]

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See detailJL 13, a pyridobenzoxazepine compound with potential atypical antipsychotic activity: a review of its behavioral properties
Bruhwyler, J.; Liégeois, Jean-François ULg; Bergman, J. et al

in Pharmacological Research (1997), 36

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See detailLes différents vaccins disponibles contre la rhinotrachéite infectieuse bovine
Thiry, Etienne ULg; Lemaire, Mylène; Schynts, Frédéric et al

in Bulletin des Groupements Techniques Vétérinaires (1997), 4B

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See detailSynthesis and characterization of monodisperse spherical zirconia particles
Van Cantfort, Olivier; Michaux, Bernard; Pirard, René ULg et al

in Journal of Sol-Gel Science and Technology (1997), 8

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See detailThe effects of shunting sytemic venous blood into the portal circulation. Review, experiences and future perspectives
D'Silva, Milbhor; Wolf, P.; Bonnet, Pierre ULg

in Archives of Hellenic Medecine (1997), 14(3), 246-264

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See detailIdentification of neurotensin-related peptides in human thymic epithelial cell membranes and relationship with MHC class I molecules
Vanneste, Yves; Ntodou-Thomé, Agnès; Vandersmissen, Eric et al

in Journal of Neuroimmunology (1997), 76

This study shows the expression at the cell surface of human thymic epithelial cells (TEC) of a neurotensin (NT)-like immunoreactivity. NT radio-immunoassay (RIA) revealed that cultured human TEC contain ... [more ▼]

This study shows the expression at the cell surface of human thymic epithelial cells (TEC) of a neurotensin (NT)-like immunoreactivity. NT radio-immunoassay (RIA) revealed that cultured human TEC contain ± 5 ng immunoreactive (ir) NT/106 cells, of which 5% is associated with plasma cell membranes. HPLC analysis of NT-ir present in human TEC showed a major peak of NT-ir corresponding to NT1–13. NT-ir was not detected in the supernatant of human TEC cultures. Using an affinity column prepared with a anti-MHC class I monoclonal antibody, NT-ir-related peptides were retained on the column and eluted together with MHC class I-related proteins. According to the elution time on HPLC of these peptides, they correspond to intact NT1–13, as well as to smaller fragments of NT1–13. [less ▲]

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See detailWhole organ vascularized cluster heart-thymus allografting : Experiences with a novel experimental model
D'Silva, Milbhor; Antoniou, E.; Howie, A. J. et al

in Cardiovascular Engineering : An International Journal (1997), 2(1), 65-74

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See detailSuivi satellitaire de la migration automnale de la cigogne noire. Aléas et perspectives d'avenir
Libois, Roland ULg; Jadoul, Gérard

in Aves (1997), 34(1), 20-22

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See detailPrognostic factors in urothelial renal pelvis and ureter tumors: A multicenter Rare Cancer Network study
Ozsahin, Mahmut; Zouhair, Abderrahim; Villà, S. et al

in International Journal of Radiation, Oncology, Biology, Physics (1997), 3(2(supp)), 290

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See detailLe comportement de reproduction du goujon, Gobio gobio, en aquarium
Poncin, Pascal ULg; Jeandarme, J.; Rinchard, J. et al

in Bull. Fr. Pêche Piscic. (1997)

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See detailStepwise introduction of pi-electron cross-conjugaison: a possible access to [5] radialenes ?
Geneste, Florence; Moradpour, Alec; Dive, Georges ULg

in Journal of Organic Chemistry (1997), 62(16), 5339-5343

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See detailMetacognitive Realism: A cognitive Style or a Learning Strategy?
Jans, Véronique; Leclercq, Dieudonné ULg

in British Journal of Educational Technology (1997), 17(1-2),

Identifies metacognitive realism as the accurate assessment by a learner of their knowledge on a subject. Considers whether realism in metacognition is a stable trait, and possible influences. Briefly ... [more ▼]

Identifies metacognitive realism as the accurate assessment by a learner of their knowledge on a subject. Considers whether realism in metacognition is a stable trait, and possible influences. Briefly reviews the literature and experimental evidence and concludes that metacognitive realism is both style and strategy. [less ▲]

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See detailL'interprétation communautaire de la notion de défendeur défaillant au sens de l'article 27, point 2, de la Convention de Bruxelles
Boularbah, Hakim ULg

in Revue de Droit Commercial Belge [= RDC] = Tijdschrift voor Belgisch Handelsrecht [=TBH] (1997)

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See detailInfestation par Paramphistomum sp. chez le bovin : description d'un premier cas en Belgique
Losson, Bertrand ULg; Cassart, Dominique ULg; Mignon, Bernard ULg

in Annales de Médecine Vétérinaire (1997), 142

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See detailThe TEL gene products: nuclear phosphoproteins with DNA binding properties.
Poirel, H.; Oury, Cécile ULg; Carron, Clémence et al

in Oncogene (1997)

The human TEL gene is involved in several 12p13 chromosomal abnormalities present in various human hematological malignancies, the most frequent being the t(12;21)(p13;q22), specific for childhood acute ... [more ▼]

The human TEL gene is involved in several 12p13 chromosomal abnormalities present in various human hematological malignancies, the most frequent being the t(12;21)(p13;q22), specific for childhood acute lymphoblastic leukemia. The predicted product of TEL harbours an amino acid region similar to the ETS DNA binding domain. We now report the isolation of the murine TEL cDNA and the characterization of the human TEL proteins. Human and murine TEL proteins are particularly homologous within their aminoterminal regions and their ETS domains. TEL proteins are nuclear and display specific DNA binding activity toward classical ETS binding sites. In addition, we show that TEL mRNAs initiate translation at either of the two first inframe ATGs (codon 1 and 43) to encode 50 kDa and 57 kDa TEL proteins. In vivo, each of these primary translational products is modified by multiple phosphorylation events. [less ▲]

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See detailPreuve et conséquences de la séparation de fait en matière d’assujettissement et d’établissement de l’impôt des personnes physiques
Orban, Lionel ULg

in Commission Université-Palais – Formation permanente – Droit fiscal. Volume XIV – Février 1997 (1997)

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See detailIron management in patients on rHuEpo
Cavill, I.; Macdougall, I. C.; Gokal, R. et al

in British Journal of Renal Medicine (1997), 2

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See detailAn Easy Way to Increase the Finite-Sample Efficiency of the Resampled Minimum Volume Ellipsoid Estimator
Croux, Christophe ULg; Haesbroeck, Gentiane ULg

in Computational Statistics & Data Analysis (1997), 25

In a robust analysis, the minimum volume ellipsoid (MVE) estimator is very often used to estimate both multivariate location and scatter. The MVE estimator for the scatter matrix is defined as the ... [more ▼]

In a robust analysis, the minimum volume ellipsoid (MVE) estimator is very often used to estimate both multivariate location and scatter. The MVE estimator for the scatter matrix is defined as the smallest ellipsoid covering half of the observations, while the MVE location estimator is the midpoint of that ellipsoid. The MVE estimators can be computed by minimizing a certain criterion over a high-dimensional space. In practice, one mostly uses algorithms based on minimization of the objective function over a sequence of trial estimates. One of these estimators uses a resampling scheme, and yields the (p + 1)-subset estimator. In this note, we show how this estimator can easily be adapted, yielding a considerable increase of statistical efficiency at finite samples. This gain in precision is also observed when sampling from contaminated distributions, and it becomes larger when the dimension increases. Therefore, we do not need more computation time nor do we lose robustness properties. Moreover, only a few lines have to be added to existing computer programs. The key idea is to average over several trials close to the optimum, instead of just picking out the trial with the lowest value for the objective function. The resulting estimator keeps the equivariance and robustness properties of the original MVE estimator. This idea can also be applied to several other robust estimators, including least-trimmed-squares regression. [less ▲]

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See detailLangmuir film balance study of the surface properties of a soluble fraction of milk fat-globule membrane
Innocente, N.; Blecker, Christophe ULg; Deroanne, C. et al

in Journal of Agricultural and Food Chemistry (1997), 45(5), 1559-1563

Viewed from its origin, composition, and physicochemical properties, milk fat-globule membrane (MFGM) appears to act as a good, natural emulsifier and should be also considered as a potential stabilizing ... [more ▼]

Viewed from its origin, composition, and physicochemical properties, milk fat-globule membrane (MFGM) appears to act as a good, natural emulsifier and should be also considered as a potential stabilizing agent in the preparation of certain foods, e.g. creams and emulsions, infant formulas, and reduced-fat products. The present work was undertaken in an attempt to gain further information on the physicochemical properties of MFGM. In particular, the purpose of this study was to determine surface properties of a soluble fraction of MFGM (SFMFGM) using a film balance and to investigate the changes in the surface activity at different temperatures, which may occur during milk cream ripening or during heat and mechanical treatments of dairy products. The results showed that film balance measurements at the air/water interface actually provided a useful method for the study of SFMFGM monolayers. It was deduced from the compression isotherms that the SFMFGM films spread at the air/water interface presented a different behavior when the temperature varied from 4 to 40 degrees C. [less ▲]

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See detailProtection possessoire et convention. Quand l'usufruitier devient bailleur
Lecocq, Pascale ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (1997)

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See detailQuelques reflexions sur les contraintes alimentations dans la production caprine en milieu tropical
Mayombo, Asangule Pierre; Hornick, Jean-Luc ULg

in Le N'Dama (1997)

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See detailDe l’acyclovir au valacyclovir: la biodisponibilité en plus de l’efficacité et de la tolérance
Rentier, Bernard ULg

in Virologics (1997), (Septembre), 10-11

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See detailSimulation of the morphology of the Jovian UV north aurora observed with the Hubble Space Telescope
Grodent, Denis ULg; Gladstone, G. R.; Gérard, Jean-Claude ULg et al

in Icarus: International Journal of Solar System Studies (1997), 128(2), 306-321

A model simulating Earth views of UV auroral arcs and diffuse emissions in the Jovian north polar region is described. It assumes a Chapman profile of vertical brightness distribution and various ... [more ▼]

A model simulating Earth views of UV auroral arcs and diffuse emissions in the Jovian north polar region is described. It assumes a Chapman profile of vertical brightness distribution and various horizontal structures, Simple geometric cases are described to illustrate the dependence on the altitude, atmospheric scale height, and central meridian planetary longitude (CML) of an idealized amoral morphology seen from Earth orbit, The numerical simulation makes it possible to assess the importance of limb brightening and the contribution from high altitude auroral emission located behind the planetary limb. As an application of the simulation model, four images obtained with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope are used to determine the characteristics of their auroral (discrete and diffuse) structures, The apparent brightness distribution along the arcs can only be reproduced if intrinsic longitudinal (or local time) variations are introduced, in addition to the path length effects of the viewing geometry, A composite average auroral distribution is built by mapping 10 WFPC2 images from the same dataset, It illustrates the dichotomy frequently observed between a narrow single structure are at System III longitudes larger than 180 degrees (or morning sector) and the multiple are and broad diffuse emission at longitudes less than 180 degrees (or afternoon sector), It is shown that the equatorial auroral emission boundary is located between the 6R(J) and the 30R(J) magnetic field line footprints of the Goddard Space Flight Center (GSFC) O-6 model. (C) 1997 Academic Press. [less ▲]

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See detailNouvelles recherches dans le site magdalénien du Trou da Somme (Hastière)
López Bayón, Ignacio; Léotard, Jean-Marc; Otte, Marcel ULg et al

in Notae Praehistoricae (1997), 17

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See detailHistoires d'e
Dupont, Pascal ULg

in Math-Jeunes (1997), 80

Two definitions of the number $e$, $\displaystyle\lim_{n\rightarrow\infty}\left(1+\frac1n\right)^n$ and $\displaystyle\sum_{n=0}^\infty\frac1{n!}$, ares shown equivalent.

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See detailDietary fibre in dogs diet : comparisons between cellulose, pectin, guar gum, and between two incorporation rates of guar gum
Diez, Marianne ULg; Van Eenaeme, Christian ULg; Hornick, Jean-Luc ULg et al

in Journal of Animal Physiology & Animal Nutrition (1997), 78

Ausgewachsene Beagle-Hunde erhielten eine Kontrolldiaet (I) aus Hackfleisch und Reis oder mit Cellulose (II), Pektin (III) bzw. Guar (IV) angereicherte Diaeten mit einem Anteil von 3.4% in der ... [more ▼]

Ausgewachsene Beagle-Hunde erhielten eine Kontrolldiaet (I) aus Hackfleisch und Reis oder mit Cellulose (II), Pektin (III) bzw. Guar (IV) angereicherte Diaeten mit einem Anteil von 3.4% in der Trockenmasse. Bei Diaet IV tendierte die Magenentleerungsrate zu niedrigeren Werten. Die intestinale Absorption von Xylose wurde durch die Diaeten IV und III nicht beeinflusst, aber durch Diaet II sign. verlangsamt. Die Varianten III und IV fuehrten zu geringeren Trockenmassegehalten im Kot(p less than 0.001). Die zugefuehrten Faserstoffe senkten teilweise die Naehrstoffverdaulichkeit. Die preprandialen Plasmakonzentrationen an Glucose, Insulin, alpha-Amino-N, Harnstoff und Triglyceriden blieben unbeeinflusst. Die Diaet IV bewirkte einen deutlichreduzierten postprandialen Anstieg von alpha-Amino-N (p less than 0.05) und Harnstoff (p less than 0.01) im Plasma sowie geringere Cholesteringehalte bei gefuetterten und nuechternen Tieren (p less than 0.05). Ein weiterer Versuch mit 3.5% bzw. 7% Guaranteil in der Diaet zeigte dosisabhaengige Effekte. [less ▲]

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See detailLes strychnos africains et leurs alcaloïdes
Delaude, Clément ULg; Delaude, Lionel ULg

in Bulletin de la Société Royale des Sciences de Liège (1997), 66(4), 183-286

In the Greek Antiquity, the term strychnos was first coined to describe various toxic Solanacae. Nowadays, the genus Strychnos created by Linnaeus in 1753 is the numerically most important genus from the ... [more ▼]

In the Greek Antiquity, the term strychnos was first coined to describe various toxic Solanacae. Nowadays, the genus Strychnos created by Linnaeus in 1753 is the numerically most important genus from the Loganiaceae family and comprises 196 species growing in the warm regions of Asia (58 species), America (64) and Africa (75). Species on the three continents are almost totally segregated. Only Strychnos potatorum is common to Asia and Africa. The toxicity of Strychnos was empirically well-known from time immemorial. Inhabitants of South-Eastern Asia and India had an ancestral knowledge of Strychnos nux vomica, whose deadly poisonous seeds were later imported and marketed in Europe to kill rodents and small predators. Concentrated extracts from Amazonian Strychnos, known as curares, are also remarkable hunting poisons, used by South American Indians. Accordingly, modern scientific investigations of Strychnos and their alkaloids started with Asian or American species used as traditionnal poisons. Strychnine was the first alkaloid found in Strychnos. It was isolated from Asian S. nux vomica in 1818, but its structure was fully elucidated only in the 1950s. Meanwhile, various curarizing alkaloids from American Strychnos were identified. Based on these early results, Strychnos alkaloids were initially classified according to their geographical origin. Asian Strychnos were assumed to contain strychnine and related compounds, whereas curarizing ammonium salts were associated with American Strychnos. African species were assimilated to their Asian counterparts and deemed of less interest. During the last three decades, however, systematic screening of African Strychnos has revealed the presence of numerous, varied alkaloids in these plants and demonstrated that the correlation between geographical distribution and alkaloid content was erroneous. Presently, 47 African species have been investigated and their alkaloids analyzed, significantly more than Asian and American materials (about 10 and 20 species, respectively). In this review, we present the alkaloids isolated so far from African Strychnos. 309 structures are listed and sorted according to their molecular weight, the most useful index key in modern research based on mass spectrometry. [less ▲]

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See detailFibres alimentaires chez le chien V. Effets sur le métabolisme glucidique. Application dans le traitement du diabète
Diez, Marianne ULg; Istasse, Louis ULg

in Annales de Médecine Vétérinaire (1997), 141

Some dietary fibres are characterized by hypoglycaemic and hypoinsulinemic effects in humans and in carnivores. At present, these properties are used in the treatment of diabetes mellitus in both species ... [more ▼]

Some dietary fibres are characterized by hypoglycaemic and hypoinsulinemic effects in humans and in carnivores. At present, these properties are used in the treatment of diabetes mellitus in both species. Finally, the dietary treatment of the diabetic dog is presented with a particular emphasis on the use of dietary fibres. [less ▲]

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See detailPhenylarsine oxide inhibits ex vivo HIV-1 expression
Edeas, M.; Arbault, S.; Legrand-Poels, Sylvie ULg et al

in Biomedicine & Pharmacotherapy (1997)

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See detailFibres alimentaires chez le chien VI. Effets sur le métabolisme lipidique, les sécrétions biliaires et application dans le traitement de l'obésité
Diez, Marianne ULg; Istasse, Louis ULg

in Annales de Médecine Vétérinaire (1997), 141(5), 363-372

Dietary fibres are able to affect lipids profiles in humans. The soluble and partly soluble fibres have mainly been studied in this purpose. Although hyperlipidaemia are known in dogs, there are few ... [more ▼]

Dietary fibres are able to affect lipids profiles in humans. The soluble and partly soluble fibres have mainly been studied in this purpose. Although hyperlipidaemia are known in dogs, there are few studies on the subject. The mechanisms by which fibres are involved are discussed with a particular emphasis on bile secretion. [less ▲]

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See detailThe effects of ammonium sulphate deposition and root sinks on soil solution chemistry in coniferous forest soils
Carnol, Monique ULg; Ineson, Phil; Anderson, J. M. et al

in Biogeochemistry (1997), 38

The effects of enhanced (NH4)(2)SO4 deposition on soil solution cation and anion concentrations and annual ionic fluxes were followed using a standardised experimental protocol in six European coniferous ... [more ▼]

The effects of enhanced (NH4)(2)SO4 deposition on soil solution cation and anion concentrations and annual ionic fluxes were followed using a standardised experimental protocol in six European coniferous forests with contrasting soil types, pollution inputs and climate. Native soil cores containing a ceramic suction cup were installed in the field, roofed and watered every two weeks with local throughfall or local throughfall with added (NH4)(2)SO4 at 75 kg NH4+-N ha(-1) a(-1). Living root systems were established in half of the lysimeters. Untreated throughfall NH4+-N deposition at the sites ranged from 3.7 to 29 kg ha(-1) a(-1). Soil leachates were collected at two weekly intervals over 12 months and analysed for volume, and concentrations of major anions and cations. Increases in soil solution NO3- concentrations in response to N additions were observed after 4-9 months at three sites, whilst one sandy soil with high C:N ratio failed to nitrify under any of the treatments. Changes in NO3- concentrations in soil solution controlled soil solution cation concentrations in the five nitrifying soils, with Al3+ being the dominant cation in the more acid soils with low base saturation. The acidification responses of the soils to the (NH4)(2)SO4 additions were primarily related to the ability of the soils to nitrify the added NH4+. pH and soil texture seemed important in controlling NH4+ leaching in response to the treatments, with two less acidic, clay/clay loam sites showing almost total retention of added NH4+, whilst nearly 75% of the added N was leached as NH4+ at the acid sandy soils. The presence of living roots significantly reduced soil solution NO3- and associated cation concentrations at two of the six sites. The very different responses of the six soils to increased (NH4)(2)SO4 deposition emphasise that the establishment of N critical loads for forest soils need to allow for differences in N storage. capacity and nitrification potential. [less ▲]

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See detailSignes cliniques et diagnostic des tumeurs de la cavité nasale chez le chien: une analyse de 81 cas.
Clercx, Cécile ULg; Peeters, Dominique ULg; Gilbert, S. et al

in Annales de Médecine Vétérinaire (1997), 141

The paper describes clinical signs and diagnosis in 81 cases of intranasal tumors n the dog, examined at the Small Animal Clinic of the Faculty of Veterinary Medicine of the University of Liege (1990-1995 ... [more ▼]

The paper describes clinical signs and diagnosis in 81 cases of intranasal tumors n the dog, examined at the Small Animal Clinic of the Faculty of Veterinary Medicine of the University of Liege (1990-1995). Recent diagnostic techniques and therapeutic options are discussed. The most frequently encountered signs included a decreased or absence of unilateral air passage, observed in 78 cases (96%), and hemorrhagic discharge, observed in 65 cases (80%). Histopathology identified 2 benign and 79 malignant tumors, 57 epithelial and 22 mesenchymatous, including 2 lymphomas. In 74 cases, rhinoscopy identified an intranasal neoplastic mass; in the 7 remaining cases, tissular material of undetermined nature was observed, and histology of biospsied material confirmed the neoplastic nature. The time interval between the diagnosis and the death of the animal (spontaneous or by euthanasia) was longer in dogs with an intranasal sarcoma (mean time interval of 7 months) than in dogs with an intranasal carcinoma (mean time interval of 3 months). [less ▲]

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See detailPotential of Varicella zoster virus thymidine kinase as a suicide gene in breast cancer cells
Grignet, Christine ULg; Calberg-Bacq, Claire-Michelle

in Gene Therapy (1997), 4

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See detailLa survie des savoirs médiévaux dans la littérature populaire. Le rôle des incunables
Opsomer, Carmélia ULg

in Bulletin de la Société des Bibliophiles liégeois (1997), 23

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See detailPredictions in overdispersed series of counts using an approximate predictive likelihood
Lambert, Philippe ULg

in Journal of Forecasting (1997), 16

The generalized autoregression model or GARM, originally used to model series of non-negative data measured at irregularly spaced time points (Lambert, 1996a), is considered in a count data context. It is ... [more ▼]

The generalized autoregression model or GARM, originally used to model series of non-negative data measured at irregularly spaced time points (Lambert, 1996a), is considered in a count data context. It is first shown how the GARM can be expressed as a GLM in the special case of a linear model for some transform of the location parameter. The Butler approximate predictive likelihood (Butler, 1986, Rejoinder) is then used to define likelihood prediction envelopes. The width of these intervals is shown to be slightly wider than the Fisher (1959, pp. 128-33) and Lejeune and Faulkenberry (1982) predictive likelihood-based envelopes which assume that the parameters have fixed known values (equal to their maximum likelihood estimates). The method is illustrated on a small count data set showing overdispersion. [less ▲]

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See detailNew insights into the metastasis-associated 67 kD laminin receptor.
Menard, S.; Castronovo, Vincenzo ULg; Tagliabue, E. et al

in Journal of Cellular Biochemistry (1997), 67(2), 155-65

The interactions between tumor cells and laminin or other components of the extracellular matrix have been shown to play an important role in tumor invasion and metastasis. These interactions are mediated ... [more ▼]

The interactions between tumor cells and laminin or other components of the extracellular matrix have been shown to play an important role in tumor invasion and metastasis. These interactions are mediated by different cell surface molecules, including the monomeric 67 kD laminin receptor. This molecule appears to be very peculiar since so, far only a full-length gene encoding a 37 kD precursor protein has been isolated and the mechanism by which the precursor reaches the mature form is not understood. Based on clinical data, which clearly demonstrate the importance of the receptor in tumor progression, studies were conducted to define the structure, expression, and function of this laminin receptor as a step toward developing therapeutic strategies that target this molecule. The data suggest that acylation of the precursor is the key mechanism in maturation of the 67 kD form. The function of the membrane receptor is to stabilize the binding of laminin to cell surface integrins, acting as an integrin-accessory molecule, although homology of the gene encoding the receptor precursor with other genes suggests additional functions. Downregulation of the receptor expression on tumor cells might open new therapeutic approaches to decrease tumor aggressiveness. [less ▲]

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See detailHypochlorous acid activates NF-kappaB transcription factor in T lymphocytes
Schoonbroodt, Sonia; Legrand-Poels, Sylvie ULg; Best-Belpomme, Martin et al

in Biochemical Journal (1997)

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See detailLes taxanes : un nouvelle classe d'agents cytotoxiques
Jerusalem, Guy ULg; Fillet, Georges ULg

in Médecine et Hygiène (1997), 55

Paclitaxel et docetaxel sont de novueaux agents cytotoxiques qui présentent un mécanisme d'action tout à fait original. Les taxanes favorisent la polymérisation des dimères alpha et bêta de la tubuline et ... [more ▼]

Paclitaxel et docetaxel sont de novueaux agents cytotoxiques qui présentent un mécanisme d'action tout à fait original. Les taxanes favorisent la polymérisation des dimères alpha et bêta de la tubuline et sont responsables d'anomalies stables de la structure des microtubules ainsi que de la formation anarchique de nombreux astères non fonctionnels. Des résultats encourageants sont observés dans le traitement de deuxième ligne d'une grande variété de cancers. La toxicité est acceptable si l'on utilise une prémédication anti-allergique. Le paclitaxel est indiqué dans le traitement de première ligne du cancer ovarien avancé et de deuxième ligne du cancer du sein métastatique réfractaire aux anthracyclines. Le remboursement dans d'autres indications est à l'étude dans les années à venir. [less ▲]

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See detailCalibration of a finite element model for bolted endplate steel connections
Bursi, O.; Jaspart, Jean-Pierre ULg

in Journal of Constructional Steel Research (1997), 44(No 3), 225-262

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See detail"Saint Lambert au banquet de Jupille". Auguste Chauvin (1810-1884) et la peinture d'histoire
George, Philippe ULg

in Bulletin de la Société Royale Le Vieux-Liège (1997), T. XIII, n° 276

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See detailProductivity and Convergence in OECD Service Industries
Gouyette, Claudine; Perelman, Sergio ULg

in Structural Change and Economic Dynamics (1997), 8

The objective of this paper is threefold. First, to estimate the productivity performances realized in service and manufacturing industries by 13 OECD countries over the period 1970-1987. Secondly, to ... [more ▼]

The objective of this paper is threefold. First, to estimate the productivity performances realized in service and manufacturing industries by 13 OECD countries over the period 1970-1987. Secondly, to compare the productivity indicators computed under the alternative frontier analysis and Divisia index approaches. Thirdly, to test the convergence phenomenon in both industries, focusing on the catching-up process and on the interaction between productivity changes and capital intensity variations. The main results show that, contrary to the manufacturing sector and in spite of very low growth rates, productivity levels converge in services. Moreover, new investments in capital appear to exert an unexpected depressive effect on total factor productivity growth in service activities, while having a positive influence in manufacturing industries. [less ▲]

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See detailPregnancies after vitrification of human day 5 embryos
Vanderzwalmen, Pierre ULg; Delval, Alain; Chatziparasidou, A. et al

in Human Reproduction (1997), 12(suppl), 98

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See detailFoaming properties of a natural cyclic lipoheptapeptide belonging to a special class of amphiphilic molecules
Razafindralambo, Hary ULg; Paquot, Michel ULg; Baniel, A. et al

in Food Hydrocolloids (1997), 11(1), 59-62

The foaming properties of surfactin, a natural cyclic lipoheptapeptide from Bacillus subtilis, were investigated in comparison and in association with those of bovine serum albumin (BSA). An apparatus ... [more ▼]

The foaming properties of surfactin, a natural cyclic lipoheptapeptide from Bacillus subtilis, were investigated in comparison and in association with those of bovine serum albumin (BSA). An apparatus combining bubbling, optical and conductimetric methods was used to study continuously foam formation and stability in terms of the quantity and density of foam. The increase in surfactin concentration from 0.05 to 0.2 mg/ml had little effect on its foaming capacity, measured by the bubbling time to produce the required foam volume, but improved the foam maximum density significantly. Surfactin produced foam with higher maximum density and stability, and forms more regular and smaller bubbles than BSA. In addition, a synergistic effect was observed on the stability of liquid in foam prepared with a mixture of 50:50 surfactin/BSA. The liquid half-life of BSA foam was enhanced up to 40% when surfactin was added to the solution. [less ▲]

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See detailMultiple pregnancy-associated glycoproteins are secreted by day 100 sheep placenta
Xie, Sancai; Green, Jonathan; Bao, Bagna et al

in Biology of Reproduction (1997), 57(6), 1384-1393

Pregnancy-associated glycoprotein (PAG)-1 (PAG1) and pregnancy-specific protein B are either identical or closely related antigens released by trophoblast binucleate cells of placentas of cattle. Sheep ... [more ▼]

Pregnancy-associated glycoprotein (PAG)-1 (PAG1) and pregnancy-specific protein B are either identical or closely related antigens released by trophoblast binucleate cells of placentas of cattle. Sheep and other ruminants produce similar products. There is evidence, however, that these antigens, which are related structurally to the pepsinogens and other aspartic proteinases, are not single gene products but members of an extensive family. Here, the sequential use of ammonium sulfate precipitation and Sepharose blue, anion-exchange, and cation-exchange chromatographies, as well as isoelectric elution from a Mono P column, has allowed several PAG1-related molecules to be purified from the medium after culture of explants from Day 100 sheep placentas. Each of these PAGs cross-reacted to a varying extent with a panel of three different anti-PAG1 antisera. Four of them, all of which were major secretory products of the placenta, were subjected to amino-terminal microsequencing. Although each was related to ovine (ov) PAG1, none was identical. Reverse transcription-polymerase chain reaction was then used to amplify PAG1-related cDNA from Day 100 placental RNA. Seven novel full-length cDNA, all distinct from ovPAG1, were identified from 25 cDNA selected for sequencing. Only two of these (ovPAG3 and ovPAG7) encoded polypeptides identical in sequence at their inferred amino termini to one of the PAGs (ovPAG65) purified from explant cultures. Even so, they were only 84% identical in overall sequence. The remaining five cDNA were unique. In situ hybridization analysis revealed that expression of ovPAG3 and ovPAG7, like that of ovPAG1, is confined to trophoblast binucleate cells. The data confirm that at Day 100 of pregnancy the ovine placenta produces many different PAGs, which differ considerably in sequence and immunological cross-reactivity. [less ▲]

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See detailDetermination of radiative lifetimes of neutral sulphur by time-resolved three-photon VUV laser spectroscopy
Berzinsh, U.; Caiyan, L.; Zerne, R. et al

in Physical Review. A : General Physics (1997), 55

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See detailFungal contamination in barley and Kashin-Beck disease in Tibet
Chasseur, Camille; Suetens, Carl; Nolard, Nicole et al

in Lancet (1997), 350

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See detailUsefulness of Induced Sputum Analysis in Pulmonary Diseases
Kayembe, J. M.; Louis, Renaud ULg; Corhay, Jean-Louis ULg et al

in Acta Clinica Belgica (1997), 52(2), 106-11

In this study, we analysed the cellular component of induced sputum in healthy control subjects (n = 30), asthmatics (n = 44), patients suffering from COPD (n = 15), pulmonary tuberculosis (PTB) (n = 14 ... [more ▼]

In this study, we analysed the cellular component of induced sputum in healthy control subjects (n = 30), asthmatics (n = 44), patients suffering from COPD (n = 15), pulmonary tuberculosis (PTB) (n = 14) and healthy steel workers (HSW) (n = 14). [less ▲]

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See detailIntegrator forwarding : a new recursive nonlinear robust design
Sepulchre, Rodolphe ULg; Jankovic, M.; Kokotovic, Petar V.

in Automatica (1997), 33(5), 979-984

We consider the global stabilization of nonlinear systems in strict feedforward form. We show that these systems, while not feedback linearizable, can be (globally) transformed by feedback and ... [more ▼]

We consider the global stabilization of nonlinear systems in strict feedforward form. We show that these systems, while not feedback linearizable, can be (globally) transformed by feedback and diffeomorphism into a lower-triangular form. The transformation is explicit and recursive. We employ this transformation to design a globally stabilizing controller with optimality properties and an input-to-state stability property with respect to matched uncertainties. [less ▲]

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See detailBeam-laser measurements and relativistic Hartree-Fock calculations of the lifetimes of the 3d94p levels in Cu II
Pinnington, E. H.; Rieger, G.; Kernahan, J. A. et al

in Canadian Journal of Physics (1997), 75

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See detailBWGIC guidelines for training and quality control in adult interventional cardiology. Belgian Working Group of Invasive Cardiology.
Legrand, Victor ULg; Vrolix, M.; De Bruyne, B. et al

in Acta cardiologica (1997), 52(6), 507-14

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See detailCompte rendu de L.C. Youtie, P. Michigan 17. The Michigan Medical Codex (P. Mich. 758 = P. Mich. inv. 21), Atlanta, 1996 (American Studies in Papyrology, 35)
Marganne, Marie-Hélène ULg

in Chronique d'Egypte : Bulletin Périodique de la Fondation Egyptologique Reine Elisabeth (1997), 72

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See detailNanoindentation and scanning force microscopy as a novel method for the characterization of tribological transfer films
Randall, N. X.; Bozet, Jean-Luc ULg

in Wear (1997), 212(1), 18-24

In conventional pin-on-disk testing of the tribological characteristics of two different materials in sliding contact, the main parameters of interest are notably the friction and wear properties of the ... [more ▼]

In conventional pin-on-disk testing of the tribological characteristics of two different materials in sliding contact, the main parameters of interest are notably the friction and wear properties of the material pair. However, when two bodies consisting of hard and soft materials respectively are subjected to such testing, the appearance of a transfer film, or third body, which can be a composite mixture of the two, is often observed. Until now the characterization of transfer films in terms of their mechanical properties has been hampered by their nonhomogeneous distribution across a tested surface, their small size, low thickness and the difficulty in accurately positioning a test probe such that the film properties can be measured independently from those of the substrate. In this paper a new method is introduced, consisting of nanoindentation and scanning force microscopy (SFM), which is capable of highly localized indentation testing of a specified sample site with high resolution imaging of the area prior to and after indentation. In this way the hardness and modulus of a transfer film can be obtained, as well as valuable surface topographical information concerning the material response to the indentation. Measurements are presented for the material pair A286/polyimide after testing on a pin-on-disk tribometer in ambient air and liquid nitrogen. Distinct variations in hardness between the transfer films and their contacting bodies have een observed and correlated to the wear behaviour and testing environment. (C) 1997 Elsevier Science S.A. [less ▲]

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