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See detailSporopodiopsis, a new genus of lichens (Ectolechiaceae) from S-E Asia
Sérusiaux, Emmanuël ULg

in Abstracta Botanica (1997), 21

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See detailCompte rendu de Sénèque et la prose latine, (Entretiens sur l'Antiquité classique, 26), Fondation Hardt, 1991, 400 pp.
Longrée, Dominique ULg

in Antiquité Classique : Revue Interuniversitaire d'Etudes Classiques (1997)

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See detailCharacterization of Clostridium perfringens isolated from necrotic enteritis of fowls.
Das, B. C.; Dutta, G. N.; Daube, Georges ULg et al

in Indian Journal of Animal Sciences (The) (1997), 67

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See detailTerm analysis and Hyperfine Structure in Neutral Vanadium
Palmeri, P.; Biémont, Emile ULg; Quinet, P. et al

in Physica Scripta (1997), 55

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See detailDe quelques problèmes posés par l'action directe de l'article 1798 du Code civil, note sous Liège (10e ch.), 23 mai 1996
Georges, Frédéric ULg

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

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See detail- Purification and characterization of tomato leaf (Lycopersicon esculentum Mill.) hydroperoxide lyase.
Fauconnier, Marie-Laure ULg; Perez, A. G.; Sanz, C. et al

in Journal of Agricultural and Food Chemistry (1997), 45(11), 4232-4236

Hydroperoxide lyase (HPOOH lyase) was extracted from tomato leaves (Lycopersicon esculentum Mill.) and purified to apparent homogeneity by fractionated precipitation with polyethylene glycol 6000, ion ... [more ▼]

Hydroperoxide lyase (HPOOH lyase) was extracted from tomato leaves (Lycopersicon esculentum Mill.) and purified to apparent homogeneity by fractionated precipitation with polyethylene glycol 6000, ion exchange chromatography, and ultrafiltration. The enzyme is a trimer of 73 000 Da units with a molecular mass of 216 000 (determined by native-PAGE and gel filtration); its pI is around 4.9. Enzyme activity measurments realized with 9- and 13-hydroperoxides of linoleic acid (9-La OOH and 13-La OOH, respectively), R-linolenic acid (9-Ln OOH and 13-Ln OOH, respectively), and ç-linolenic acid (9-çLn OOH and 13-ç-Ln OOH, respectively) revealed a great affinity for 13-Ln OOH. The enzyme is rapidly inhibited by its substrate (13-Ln OOH), but preincubation with the other five hydroperoxides, which are not degraded by the enzyme, also resulted in activity inhibition. Dialysis could not restore the activity. When 13-Ln OOH is reduced in its corresponding alcohol or converted to its methyl ester, the inhibition is reduced. [less ▲]

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See detailFormation of long-wavelength chlorophyllide (Chlide695) is required for the assembly of Photosystem II in etiolated barley leaves
Franck, Fabrice ULg; Eullaffroy, P.; Popovic, R.

in Photosynthesis Research (1997), 51(2), 107-118

Chlorophyll(ide) spectroscopic properties and Photosystem II assembly, monitored by 77 K variable fluorescence, were studied in etiolated barley leaves as a function of the extent of protochlorophyllide ... [more ▼]

Chlorophyll(ide) spectroscopic properties and Photosystem II assembly, monitored by 77 K variable fluorescence, were studied in etiolated barley leaves as a function of the extent of protochlorophyllide photoreduction by a single millisecond light flash of different intensities. Variable fluorescence, measured 2 hours after the flash, was only detected when the extent of phototransformation was higher than a threshold value of 0.4. Its development paralleled the formation of a chlorophyll emission component at 685 nm, which itself derived from long-wavelength chlorophyllide with an emission maximum at 695 nm. At low flash intensities, short-wavelength chlorophyllide forms preferentially accumulated and no Photosystem II fluorescence was detected after 2 hours. Chlorophyllide esterification was independent of the extent of phototransformation. These results suggested that the formation of long-wavelength chlorophyllide was essential for further assembly of Photosystem II. This interpretation was strengthened by the observed inhibition of both long-wavelength chlorophyllide formation and of variable fluorescence development in leaves treated with 6-aminolevulinic acid or in untreated leaves subjected to repeated flashes of low intensity. [less ▲]

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See detailProprietes interfaciales des films de gluten de farines de qualites boulangeres differentes.
Balla, A.; Blecker, Christophe ULg; Razafindralambo, Hary ULg et al

in Sciences des Aliments (1997), 17(3), 271-278

Interfacial properties of gluten proteins are important in determining flour breadmaking quality especially the gas bubbles stability in dough, which influences the loaf volume and crumb texture. The ... [more ▼]

Interfacial properties of gluten proteins are important in determining flour breadmaking quality especially the gas bubbles stability in dough, which influences the loaf volume and crumb texture. The interfacial properties of gluten extracted from four commercial flours have been studied. The behaviour of gluten monolayer spread at the air-water interface is influenced by the gliadins/glutenins ratio. Films of gluten extracted from flours with high gliadins/glutenins ratio spread more quickly, present a higher stability (Pi c) and are more resistant under high compression. [less ▲]

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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 detailGrammaticaal spektakel
Meesters, Gert ULg

in Nederlands Van Nu (1997), 45(4), 119-120

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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 detailSympathetic modulation of hypoxic pulmonary vasoconstriction in intact dogs
Brimioulle, Serge; Vachiéry, Jean-Luc; Brichant, Jean-François ULg et al

in Cardiovascular Research (1997), 34

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See detailLeaf carbohydrate status in Lolium temulentum during the induction of flowering
Périlleux, Claire ULg; Bernier, Georges ULg

in New Phytologist (1997), 135(1), 59-66

Unifoliated plants of Lolium temulentum L. ev. Ceres, a qualitative long-day grass, were induced to flower by one 24-h long day (LD) or by one 8-h short day (SD) advanced by 1 2 h in the normal regime, so ... [more ▼]

Unifoliated plants of Lolium temulentum L. ev. Ceres, a qualitative long-day grass, were induced to flower by one 24-h long day (LD) or by one 8-h short day (SD) advanced by 1 2 h in the normal regime, so-called 'displaced short day' (DSD). Standard light for SD and DSD was a mixture of fluorescence and incandescence at 400 µmol m2 s-1 whereas the extension period of the 24-h LD was solely incandescence at 10-15 µmol m2 s-1. The DSD system was first characterized by the timings of floral induction, stimulus translocation and apical development. Carbohydrates in the blade tissues and in leaf exudate were analysed comparatively in vegetative and induced plants. Fructans were not detected in the leaf tissues whereas sucrose and starch were found to be present in similar amounts. In SD, their contents exhibited a diurnal fluctuation and were not in large excess. The common change observed during the two inductive treatments was that starch remained at a high level during the LD extension, even though the lighting was unsuitable for photosynthesis, and increased transiently in DSD. Sucrose was the major sugar contained in the leaf exudate. Its content increased when flowering was induced, but not at the same time in the two systems. In LD, sucrose exudation rose when plants were returned to standard light after the inductive cycle, i.e. after the LD stimulus had left the leaf blade. By contrast, during the DSD, sucrose was transported at the same time as the floral stimulus. Results are discussed together with the methods used to time stimulus translocation and their implications. [less ▲]

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See detailEffect of potassium channel openers on the firing rate of hippocampal pyramidal cells and A10 dopaminergic neurons in vitro.
Scuvée-Moreau, Jacqueline ULg; Seutin, Vincent ULg; Vrijens, Bernard ULg et al

in Archives of Physiology & Biochemistry (1997), 105(5), 421-8

The effect of four KATP channel openers (KCOs) on the firing rate of CA1 pyramidal cells and A10 dopaminergic neurons was investigated using extracellular recording techniques in rat brain slices ... [more ▼]

The effect of four KATP channel openers (KCOs) on the firing rate of CA1 pyramidal cells and A10 dopaminergic neurons was investigated using extracellular recording techniques in rat brain slices. Pinacidil, lemakalim, diazoxide and a new compound, BPDZ44, had an inhibitory effect on the electrical activity of CA1 pyramidal cells. They all had a similar potency. Only BPDZ44 and diazoxide inhibited the firing rate of A10 dopamine neurons. The sulfonylurea glipizide (1 microM) antagonized the effect of BPDZ44 and diazoxide on A10 neurons but failed to antagonize the effect of KCOs on CA1 pyramidal cells. These results show that differences exist among KCOs in their ability to decrease the electrical activity of various populations of central neurons. [less ▲]

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See detailInfluence of dominance relationships on the estimation of dominance variance with sire-dam subclass effects
Gengler, Nicolas ULg; VanVleck, L. D.; MacNeil, M. D. et al

in Journal of Animal Science (1997), 75(11), 2885-2891

Two data sets from the USDA Livestock and Range Research Laboratory mere analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 ... [more ▼]

Two data sets from the USDA Livestock and Range Research Laboratory mere analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 weaning weight) records of inbred USDA Line 1 Herefords. The second consisted of 8,065 birth weight (7,380 weaning weight) records from a line-cross experiment with five lines. Two models were used. Both included fixed effects of year-sex of calf and age of dam, and covariates for calving date, inbreeding of animal, and inbreeding of dam. For the second set, additional covariates were line composition and heterozygosity coefficients. Random effects were direct and maternal additive genetic, maternal permanent environment, sire-dam subclass, and residual. Model 1 considered sire-dam subclasses unrelated. Model 2 related sire-dam subclasses with a parental dominance relationship matrix. Variance components were estimated using REML. Differences between estimates with Model 1 and 2 were unimportant except for dominance variance. For the first data set, estimates with Model 2 of relative genetic direct and maternal variances, direct-maternal correlation, permanent environment, and dominance variances for birth weight were .35, .13, -.02, .03, and .25, respectively, and they were .39, .11, .04, .06 and .14 for the second data set. For weaning weight, the first data set estimates were .20, .15, -.37, .19, and .11, respectively, and they were .16, .20, -.07, .18, and .18 for the second data set. Changes, decreases and increases, in estimates of dominance variances may be due to increased information from relationships and family types other than full-sibs. The assumption of unrelated sire-dam subclasses might not be appropriate for estimation of dominance variance in populations with many dominance relationships among siredam classes. [less ▲]

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See detailExpression of insulin-related peptides in the human thymus
Geenen, Vincent ULg; Lefebvre, Pierre ULg

in International Diabetes Monitor (1997), 9

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See detailNos élèves préfèrent Pythagore à Newton
Monseur, Christian ULg

in Pilotinfo (1997), 20(septembre),

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See detailEstimation d'un indice de la valeur récréative des forêts
Lejeune, Philippe ULg; Rondeux, Jacques ULg; Verstraete, Philippe

in Mitteilungen der Abteilung für Forstliche Biometrie (1997), 97(2), 20-30

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See detailRoom temperature fluorescence spectra of protochlorophyllide and chlorophyllide forms in etiolated bean leaves
Boddi, B.; Franck, Fabrice ULg

in Journal of Photochemistry and Photobiology B : Biology (1997), 41(1-2), 73-82

Room-temperature fluorescence emission and excitation spectra of 3-day or 10-day old dark-grown bean (Phaseolus vulgaris L. cv Commodore) leaves were measured. The excitation light was defocused in such ... [more ▼]

Room-temperature fluorescence emission and excitation spectra of 3-day or 10-day old dark-grown bean (Phaseolus vulgaris L. cv Commodore) leaves were measured. The excitation light was defocused in such way that only a low rate of phototransformation took place and protochlorophyllide (Pchlide) forms could be detected. The spectra were resolved into gaussian components using a new method based on the comparison of the 4th derivative of the experimental spectrum and that of the calculated spectrum, i.e. the sum of the gaussians. In addition to Pchlide emission bands with maxima at 631, 644, 655 and 667 nm which correspond to those described earlier in 77 K spectra, two new and unusally narrow bands were found at 637 and 650 nm. Tn the Chlide region, emission bands were found at 676, 682, 686 and 695 nm. Changes in the relative amplitudes of the Pchlide and Chlide room temperature emission bands as a function of age, of excitation wavelength and in response to a short light flash were studied. A model is given in which dynamic interconversions of the pigment forms are suggested and the presence of the new forms is explained with the differences in the aggregational states of the pigments and with their interaction with NADPH or NADP(+). (C) 1997 Elsevier Science S.A. [less ▲]

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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 detailRelationship of human follicular diameter with oocyte fertilization and development after in-vitro fertilization or intracytoplasmic sperm injection.
Ectors, Fabien ULg; Vanderzwalmen, P.; Van Hoeck, J. et al

in Human Reproduction (1997), 12(9), 2002-2005

The aim of this work was to evaluate the relationship between follicular size at the time of oocyte retrieval, and the subsequent oocyte competence to be fertilized and to develop in vitro. All the ... [more ▼]

The aim of this work was to evaluate the relationship between follicular size at the time of oocyte retrieval, and the subsequent oocyte competence to be fertilized and to develop in vitro. All the obtained oocytes were classified according to the corresponding volume of aspirated follicular fluid. Aspirated volume of follicular fluid <2 ml corresponded to a follicular diameter <16 mm and constituted the small size group. Volume of follicular fluid from 2 to 6 ml corresponded to a diameter from 16 to 23 mm and constituted the medium size group. The large size group contained follicles with diameter >23 mm and corresponded to an aspirated volume of follicular fluid of >6 ml. A progressive and significant increase in the rates of oocytes with a first polar body was observed from the small size group to the other groups and from the medium to the large size group: 75.3, 85.9 and 95.3% respectively. After classical in-vitro fertilization (IVF), significantly better rates of fertilization and development were obtained in the medium size group compared to the two other groups. Moreover, a positive relationship was observed between follicular diameter and rates of embryos scored as 'good' when oocytes were fertilized by intracytoplasmic sperm injection (ICSI). These results demonstrated that follicular size is positively related to the oocyte ability to be fertilized and to develop. Although oocytes from small follicles gave lower percentages of development probably due to partial oocyte incompetence, they allowed an increase in the total number of embryos scored as 'good'. [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 detailCombined Effect of Web 2086 (Paf Antagonist) and Ketoprofen (Nsaid) on Paf-Induced Ex Vivo Platelet Aggregation in Bovine
Bastos da Silva, Miriam; Herion, Francine ULg; Raskinet, Renée ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1997), 44(2), 65-71

The effect of the specific PAF-antagonist WEB 2086, a thieno-triazolo-diazepine, and ketoprofen, a NSAID, was investigated on PAF-induced bovine platelet aggregation measured ex vivo in platelet-rich ... [more ▼]

The effect of the specific PAF-antagonist WEB 2086, a thieno-triazolo-diazepine, and ketoprofen, a NSAID, was investigated on PAF-induced bovine platelet aggregation measured ex vivo in platelet-rich plasma (PRP). WEB 2086 was infused intravenously over 1 min followed immediately by ketoprofen administration over 1 s (both drugs = 3 mg/kg), in a group of six healthy male Friesian calves. Depending on the PAF concentration, a reversible (10(-8)-10(-9) mol/l) and irreversible (10(-5)-10(-7) mol/l) platelet aggregation was observed. The reversible aggregation was completely blocked by pretreatment of the animal with WEB 2086 and ketoprofen. The inhibitory effects observed during the irreversible aggregation were 47.22%, 54.00% and 88.00% at 10(-5), 10(-6) and 10(-7) mol/l PAF, respectively. Moreover, the aggregation obtained in these condition became reversible. Maximal inhibitory effect of WEB 2086 and ketoprofen on PAF-induced platelet aggregation in calves was observed within 30 min after administration of both drugs. This inhibition persisted even after 24 h and was significantly different from control with P < 0.05. The combined effect of both drugs exceeded the sum of the individual effects (synergism). It was concluded that WEB 2086 and ketoprofen very effectively blocked PAF-induced bovine platelet aggregation in platelet-rich plasma. The study also suggested a synergism between both substances. [less ▲]

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See detailCharacterization of the IGF system and analysis of the possible molecular mechanisms leading to IGF-II overexpression in a mesothelioma.
Hodzic, D.; Delacroix, Laurence ULg; Willemsen, P. et al

in Hormone & Metabolic Research (1997), 29(11), 549-55

The expression of members of the IGF system in a mesothelioma from a patient suffering from hypoglycemia, in term placenta and HT29 colon adenocarcinoma cells were compared. Very high levels of IGF-II ... [more ▼]

The expression of members of the IGF system in a mesothelioma from a patient suffering from hypoglycemia, in term placenta and HT29 colon adenocarcinoma cells were compared. Very high levels of IGF-II mRNA and protein were detected in the mesothelioma. Moreover, half of the IGF-II protein took the high-molecular-weight form. We also analyzed the parental imprinting status and the promoter usage of the IGF-II gene. Our results showed loss of imprinting (LOI) in the mesothelioma while the imprinting was maintained in HT29 cells, expressing moderate levels of the transcript. Promoter P4 was active in the three tissues we analyzed, whereas IGF-II mRNA transcription from promoter P3 was only detected in the mesothelioma and the placenta, expressing comparably high levels of the transcript. IGF-II gene structure was identical in the analyzed tissues and cells. The type-I receptor mRNA expression was very low in the tumor. IGFBP-2, -4 and -5 mRNAs were detected in the mesothelioma, while IGFBP-2, -3 and -5 transcripts were detected in the placenta. IGFBP-1 and -6 transcripts were not detected. [less ▲]

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See detailPolyclonal Bovine Sera But Not Virus-Neutralizing Monoclonal Antibodies Block Bovine Leukemia Virus (Blv) Gp51 Binding To Recombinant Blv Receptor Blvrcp1
Orlik, O.; Ban, J.; Hlavaty, J. et al

in Journal of Virology (1997), 71(4),

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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 detailSaisie-arrêt et concours des créanciers: fin d'une controverse, note sous Cass. (1ère ch.), 11 avr. 1997
Georges, Frédéric ULg

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

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See detailComparative evaluation of five hygroscopic condenser humidifiers during short-term postoperative mechanical ventilation
Sottiaux, Thierry; Meurice, F.; Mignolet, Ghislaine ULg et al

in Acta Anaesthesiologica Italica & Anaesthesia and Intensive Care in Italy (1997), 48(1-2), 59-68

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See detailZiemniak w Belgii
Burny, Philippe ULg; Gazinski, Benon

in Rolnicze abc (1997), 6(83), 20

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See detailVieillissement normal, démence d'Alzheimer et mémoire de travail
Van der Linden, Martial ULg; Collette, Fabienne ULg; Andrès Bénito, Pilar

in Psychologie Française (1997), 42

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See detailChanging sensitivity to duration in human scalar timing: An experiment, a review, and some possible explanations
Ferrara, André ULg; Lejeune, Helga ULg; Wearden, J. H.

in Quarterly Journal of Experimental Psychology. B, Comparative & Physiological Psychology (1997), 50B

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See detailIl libro di messer Tristano («Tristano Veneto»).
Moreno, Paola ULg

in Moyen Age (Le) (1997)

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See detailL'AMDP appliqué à des réfugiés de Croatie
Mormont, Christian ULg

in Acta Psychiatrica Belgica (1997), 97(1), 55-60

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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 detailCrystallization and preliminary X-ray analysis of bacteriophage lambda lysozyme in which all tryptophans have been replaced by aza-tryptophans
Evrard, Christine ULg; Declercq, Jean-Paul; Fastrez, Jacques

in Acta Crystallographica Section D-Biological Crystallography (1997), D53

After many unsuccessful attempts to crystallize the bacteriophage lambda lysozyme, a mutant where all the tryptophan residues have been replaced by aza-tryptophans has been crystallized by the vapor ... [more ▼]

After many unsuccessful attempts to crystallize the bacteriophage lambda lysozyme, a mutant where all the tryptophan residues have been replaced by aza-tryptophans has been crystallized by the vapor-diffusion method. The crystals are orthorhombic and belong to space group P212121 with cell dimensions a = 73.01, b = 78.80, c = 82.31 Å. Diffraction data were collected using synchrotron radiation sources. Crystals diffract to a resolution of 2.3 Å. Data from two different platinum derivatives were also recorded to 2.8 and 2.5 Å, respectively. [less ▲]

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See detailNew Primers For The Polymerase Chain Amplification Of Cpdna Intergenic Spacers In Phaseolus Phylogeny
Fofana, B.; Harvengt, L.; Baudoin, Jean-Pierre ULg et al

in Belgian Journal of Botany (1997), 129(2),

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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 detailThe yeast genome directory.
Goffeau, A.; Hilger, F.; Portetelle, Daniel ULg et al

in Nature (1997), 387(5),

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See detailPenicillin-binding proteins. Wall peptidoglycan assembly and resistance to penicillin: facts, doubts and hopes
Ghuysen, Jean-Marie ULg; Charlier, Paulette ULg; Coyette, Jacques ULg et al

in International Journal of Antimicrobial Agents (1997), 8(1), 45-60

As the protein sequence and structure databases expand, the relationships between proteins, the notion of protein superfamily, and the driving forces of evolution are better understood. Key steps of the ... [more ▼]

As the protein sequence and structure databases expand, the relationships between proteins, the notion of protein superfamily, and the driving forces of evolution are better understood. Key steps of the synthesis of the bacterial cell wall peptidoglycan are revisited in light of these advances. The reactions through which the D-alanyl-D-alanine depeptide is formed, utilized, and hydrolyzed and the sites of action of the glycopeptide and β-lactam antibiotics illustrate the concept according to which new enzyme functions evolve as a result of tinkering of existing proteins. This occurs by the acquisition of local structural changes, the fusion into mul-timodular polypeptides, and the association into multiprotein complexes. [less ▲]

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See detailVrbis-Orbis (Ovide, Fastes, II, 684)
Rochette, Bruno ULg

in Latomus : Revue d'Etudes Latines (1997), 56(3), 551-553

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See detailL’arsénopyrite du Massif de Stavelot, Belgique
Hatert, Frédéric ULg

in Bulletin de la Société Royale des Sciences de Liège (1997), 66

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See detailLe diagnostic de la reproduction: fertilité, gestation, anœstrus
Delahaut, Philippe; Sulon, Joseph ULg; Ectors, Francis et al

in Cahiers Agricultures (1997), 6

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See detailInfluence of cholesterol on survival after stroke. Cholesterol may be marker of inflammation.
VALDES SOCIN, Hernan Gonzalo ULg

in BMJ (Clinical Research ed.) (1997), 315(7116), 1159

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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 detailProgramme EsQUIsE. Acquisition et interprétation de croquis d'architecture
Leclercq, Pierre ULg

in La lettre de l'IA (1997), 123

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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 detailPour l’optimisation de la stratégie thérapeutique dans la maladie osseuse de Paget
Reginster, Jean-Yves ULg; Gennari, C; Hosking, DJ et al

in Revue du Rhumatisme (1997), 64(4), 221-223

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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 detailColestasis asociada a ticlopidina
Diaz Fuenzalida, A.; VALDES SOCIN, Hernan Gonzalo ULg; Laudano, O. et al

in Gastroenterologia y Hepatologia (1997), 20(3), 128-30

The case of a 56-years-old male with cholestasis associated with ticlopidine is presented. Cholestasis is an infrequent adverse effect of this drug. The patient was admitted to hospital because of ... [more ▼]

The case of a 56-years-old male with cholestasis associated with ticlopidine is presented. Cholestasis is an infrequent adverse effect of this drug. The patient was admitted to hospital because of jaundice, choluria, and itching of one month of evolution. The patient had taken ticlopidine twice a day for 3 months up to one week prior to admission for peripheral arteriopathy. Biopsy was performed showing acinar cholestasis and portal inflammatory infiltrate compatible with cholestasis due to hypersensitivity. Ticlopidine was discontinued by the patient himself one week prior to admission. The drug was not readministered and the evolution of the clinical and biochemical parameters of cholestasis decreased. The patient was asymptomatic and laboratory data were normal 4 months later. [less ▲]

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See detailA 2-year phase II study with 1-year of follow-up of risedronate (NE58095) in postmenopausal osteoporosis
Clemmesen, B; Ravn, P; Zegels, Brigitte ULg et al

in Osteoporosis International (1997), 7

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See detailUne nouvelle sagesse en hiératique de la Basse Époque (Papyrus Brooklyn Museum 47.218.135)
Winand, Jean ULg

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

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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 detailEtude radiographique des affections ostéo-articulaires juvéniles (AOAJ) chez des chevaux de races françaises âgés de 3 ans : présentation globale des résultats sur 761 sujets.
Denoix, JM; Valette, JP; Robert, C et al

in Bulletin de la Société Vétérinaire Pratique de France (1997)

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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 detailGenetic Structure Of A Lima Bean Base Collection Using Allozyme Markers
Maquet, A.; Bi, Iz.; Delvaux, M. et al

in Theoretical & Applied Genetics = Theoretische und Angewandte Genetik (1997), 95(5-6),

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See detailEtude de la taille des nanoparticules après incorporation dans des sphéroïdes gastrorésistants
Duvivier, F; Grandfils, Christian ULg; Léonard, F et al

in Journal de Pharmacie de Belgique (1997), 52(3), 123

Nanoparticles can be used as an attractive carrier for the controlled delivery of drugs by the oral route. This nanoparticular delivery system can protect an active ingredient from enzymatic degradations ... [more ▼]

Nanoparticles can be used as an attractive carrier for the controlled delivery of drugs by the oral route. This nanoparticular delivery system can protect an active ingredient from enzymatic degradations and enhance its absorption from the intestinal mucosa. We studied the development of a gastroresistant dosage form for the oral administration of nanoparticles. Fast disintegrating pellets were used for the administration of nanoparticles and for their transit to the site of absorption. A gastroresistant film was applied onto the pellets to protect the nanoparticles and/ or the active substance from the acid gastric environment. The integrity of the nanoparticle size was assessed after two critical manufacturing steps: the extrusion/spheronisation process and the coating process. The determination of the nanoparticles size distribution was performed by photon correlation spectroscopy (PCS). The comparison of the PCS results between the original nanoparticles and the nanoparticles incorporated in the pellets shows a very low aggregation. Moreover the coating process was not a critical step since it was not responsible for an additional agglomeration of the nanoparticles. In conclusion, our manufacturing process allows the redispersion of the nanoparticles with a little change of the size distribution. In a next study we well try to quantify the release of the nanoparticles from the pellets. [less ▲]

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See detailBiosynthesis of 5-aminolevulinic acid via the Shemin pathway in a green sugar beet callus
Bisbis, B.; Billard, J. P.; Huault, C. et al

in Biologia Plantarum (1997), 40(4), 493-497

5-Aminolevulinic acid synthase (ALAS) has been detected in a normal (auxin- and cytokinin-dependent) green sugar beet callus under light and under darkness. ALAS activity was lower when the callus was ... [more ▼]

5-Aminolevulinic acid synthase (ALAS) has been detected in a normal (auxin- and cytokinin-dependent) green sugar beet callus under light and under darkness. ALAS activity was lower when the callus was grown under light. The supply of precursors of the Shemin pathway (glycine and succinate) to dark-grown callus enhanced considerably the capacity of the 5-aminolevulinic acid (ALA) formation. Glutamate, γ-aminobutyrate or α-ketoglutarate also increased ALA accumulation. Such an accumulation was also obtained after inhibition of polyamine synthesis. The results show that glutamate or its derivatives might feed the Shemin pathway in conditions preventing glutamate to be used through the Beale pathway. [less ▲]

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See detailComment se développe le savoir-lire ?
Hindryckx, Geneviève ULg; Lafontaine, Annette ULg

in Point sur la Recherche en Education (Le) (1997), 4

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See detailPeritoneal endometriosis, ovarian endometriosis, and adenomyotic nodules of the rectovaginal septum are three different entities
NISOLLE, Michelle ULg; Donnez, Jacques

in Fertility and Sterility (1997), 68(4), 585-596

Objective: To review the histogenesis of peritoneal, ovarian, and rectovaginal endometriotic lesions. Design: The comparison of morphologic, morphometric, and histochemical data observed in each type of ... [more ▼]

Objective: To review the histogenesis of peritoneal, ovarian, and rectovaginal endometriotic lesions. Design: The comparison of morphologic, morphometric, and histochemical data observed in each type of lesion. Setting: A university hospital department of gynecology. Patient(s): Patients complaining of infertility or pelvic pain with laparoscopically proved endometriosis. Intervention(s): Laparoscopy was performed, and biopsy specimens from the endometriotic lesions were histologically studied. Result(s): Three types of endometriotic lesions must be considered: peritoneal, ovarian, and rectovaginal. Morphologic and morphometric data show similarities between eutopic endometrium and red peritoneal lesions, suggesting that these lesions are the first stage of early implantation of endometrial glands and stroma. After partial shedding, the red lesions regrow constantly. The shedding induces an inflammatory reaction, provoking scarification, and the lesions become black. The subsequent fibrosis leads to areas of white opacification that are inactive. The pathogenesis of ovarian endometriomas is a source of controversy. Although there seems to be a consensus concerning the invagination theory, there is still a contradiction between the implantation theory and the metaplasia theory. We recently showed that the mesothelium covering the ovary can invaginate into the ovarian cortex, pushing back the primordial follicles. The presence of mesothelial invagination in continuum with endometriotic tissue suggests that metaplastic histogenesis of ovarian endometriotic lesions occurs. Rectovaginal endometriotic nodules must be considered adenomyomas, consisting of smooth muscle with active glandular epithelium and scanty stroma. Immunocytochemical results show poor differentiation and hormonal independence of these lesions and indicate a close relation with their mesodermal müllerian origin. Conclusion(s): Peritoneal, ovarian and rectovaginal endometriotic lesions must be considered as three separate entities with different pathogeneses. [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 detailHormonal control of adventitious rooting: Progress and questions
Kevers, Claire ULg; Hausman, J. F.; Faivre-Rampant, O. et al

in Journal of Applied Botany (1997), 71(3-4), 71-79

According to the traditional concept, adventitious rooting is a single developmental process, controlled by one single chief actor, auxin. This concept is out-of-date. This review develops the arguments ... [more ▼]

According to the traditional concept, adventitious rooting is a single developmental process, controlled by one single chief actor, auxin. This concept is out-of-date. This review develops the arguments for rooting as a process consisting of successive physiological phases, with different exogenous requirements. The levels of auxins, peroxidases, phenolic compounds, cytokinins, polyamines, and ethylene undergo typical changes during these phases. Their complex interactions are far from being elucidated. The changes characterizing the rooting inductive phase may be similar to those occurring during flowering evocation. Thus these changes seem to be more indicative of a shift in a developmental programme than of a specific organogenic process. [less ▲]

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See detailAntibodies against vaccinia virus do not neutralize extracellular enveloped virus but prevent virus release from infected cells and comet formation
Vanderplasschen, Alain ULg; Hollinshead, M.; Smith, G. L.

in Journal of General Virology (The) (1997), 78(Pt 8), 2041-2048

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See detailL'abord coelioscopique des pheochromocytomes est-il acceptable? Reflexions a propos d'une etude prospective de 6 cas personnels.
Hamoir, Etienne ULg; Defechereux, Thierry ULg; Nguyen Dang, Delphine ULg et al

in Annales d'Endocrinologie (1997), 58(1), 65-74

Today, laparoscopy is for us the technique of choice for approaching presumed benign adrenal tumors. With regards to pheochromocytoma however, two major questions must be addressed. First, is it ... [more ▼]

Today, laparoscopy is for us the technique of choice for approaching presumed benign adrenal tumors. With regards to pheochromocytoma however, two major questions must be addressed. First, is it acceptable to resect potentially multifocal tumors with such a targeted approach? Second, can peroperative hemodynamic changes be anticipated and controlled by the anesthetist, taking into account the additional effects of pneumoperitoneum and catecholamine release on the cardiovascular system? The present prospective study attempts to answer these two questions. From November 1993 to November 1995 we operated on four women and two men, with ages ranging from 33 to 71 years (mean of 47) and a mean Body Mass Index of 25 kg/m2 (range 17-35). Four patients were assigned ASA (American Society of Anesthesiologists) physical status 2, one grade 1 and one grade 3. Comprehensive preoperative work-up, including a CT scan and an I131 MIBG Scan in all, a C11 Hydroxyephedrine PET Scan in 4 and a MRI in one patient, showed a solitary lesion in each case. There were four right-sided and two left-sided tumors, ranging from 30 to 60 mm in diameter. Laparoscopy was always performed transperitoneally. Systemic and pulmonary hemodynamics were thoroughly assessed. Epinephrin and norepinephrin concentrations were measured at the 10 key-time of surgery. Use of continuous intravenous infusion of nicardipine allowed tight control of hemodynamics despite impressive increases in circulating catecholamines. The mean operative time was 76 minutes (range 59-130). Blood loss was minimal. We observed neither mortality nor morbidity. Mean hospital stay ranged from 3 to 13 days (median = 3). All patients are normotensive without drug after a follow-up of 9 to 33 months. In conclusion, we think that laparoscopic removal of selected cases of pheochromocytoma may be performed safely from both the hemodynamical and oncological standpoints. [less ▲]

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See detailGalectin-3 and laminin expression in neoplastic and non-neoplastic thyroid tissue.
Fernandez, P. L.; Merino, M. J.; Gomez, M. et al

in Journal of Pathology (The) (1997), 181(1), 80-6

Galectin-3 is a 31 kD beta-galactoside-binding lectin which is expressed by several types of non-neoplastic and neoplastic cells and which may be involved in cell-extracellular matrix interactions. An ... [more ▼]

Galectin-3 is a 31 kD beta-galactoside-binding lectin which is expressed by several types of non-neoplastic and neoplastic cells and which may be involved in cell-extracellular matrix interactions. An immunohistochemical study has been made of the expression of galectin-3, as well as its ligand, laminin, in a spectrum of benign and malignant thyroid neoplasms and in some non-neoplastic conditions. Immunohistochemistry with anti-human recombinant galectin-3 antibody showed consistent, intense positivity in the neoplastic cells of 18 cases of papillary carcinoma and less intense staining in the five anaplastic carcinomas studied. In addition, two out of three poorly differentiated carcinomas, three out of six medullary carcinomas, and four out of eight follicular carcinomas had less intense or focal positivity. One case of Hurthle cell carcinoma showed scattered strongly positive cells. Eight follicular adenomas, three hyperplastic nodules, five nodular goitres, and normal thyroid tissue were negative. Galectin-3 mRNA expression was also evaluated in three of the papillary carcinomas, two follicular adenomas, and one hyperplastic nodule with matched normal tissue. Northern blot analysis demonstrated mRNA overexpression in the three cases of papillary carcinomas, whereas normal and benign tissues were negative. Laminin distribution in neoplastic and non-neoplastic tissue varied with architectural patterns but did not correlate with galectin-3 immunohistochemical expression. We conclude that expression of galectin-3 is limited to inflammatory foci in normal and benign thyroid tissue and is a phenotypic feature of malignant thyroid neoplasms, especially papillary carcinomas. [less ▲]

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See detailRéflexions sur l’iconologie de la châsse de saint Remacle
Van den Bossche, Benoît ULg

in Bulletin de la Société d’Art et d’Histoire du Diocèse de Liège (1997), LXII

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See detailLa responsabilité civile et professionnelle des administrateurs
Caprasse, Olivier ULg

in Actualités du Droit (1997)

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See detailRadiation therapy duration influences overall survival in patients with cervix carcinoma.
Coucke, Philippe ULg; Delaloye, J-F; Pampallona, S et al

in International Journal of Gynecology & Obstetrics (1997), 57

of the cervix treated by radical radiation therapy. Method; Three hundred and sixty patients with FIG0 stage IB-IIIB carcinoma of the cervix were treated in Lausanne (Switzerland) with external radiation ... [more ▼]

of the cervix treated by radical radiation therapy. Method; Three hundred and sixty patients with FIG0 stage IB-IIIB carcinoma of the cervix were treated in Lausanne (Switzerland) with external radiation and brachytherapy as first line therapy. Median therapy duration was 45 days. Patients were classified according to the duration of the therapies, taking 60 days (the 75th percentile) as an arbitrary cut-off. Results: The 5-year survival was 61% (SE. = 3%) for the therapy duration group of less than 60 days and 53% (SE. = 7%) for the group of more than 60 days. In terms of univariate hazard ratio (HR), the relative difference between the hvo groups corresponds to a 50% increase of deaths (HR = 1.53, 95% CI = 1.03-2.28) for the longer therapy duration group (P = 0.044). In a multivariate analysis, the magnitude of estimated relative hazards for the longer therapies are confirmed though significance was reduced (HR = 1.52, 95% CI = 0.94-2.45, P = 0.084). Conclusion: These findings suggesthat short treatment duration is a factor associated with longer survival in carcinoma of the cervix. 0 1997 International Federation of Gynecology and Obstetrics [less ▲]

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See detailDrug treatment of non-insulin-dependent diabetes mellitus in the 1990s. Achievements and future developments.
Scheen, André ULg

in Drugs (1997), 54(3), 355-68

Non-insulin-dependent diabetes mellitus (NIDDM, type 2 diabetes) is a heterogeneous disease resulting from a dynamic interaction between defects in insulin secretion and insulin action. There are various ... [more ▼]

Non-insulin-dependent diabetes mellitus (NIDDM, type 2 diabetes) is a heterogeneous disease resulting from a dynamic interaction between defects in insulin secretion and insulin action. There are various pharmacological approaches to improving glucose homeostasis, but those currently used in clinical practice either do not succeed in restoring normoglycaemia in most patients or fail after a variable period of time. For glycaemic regulation, 4 classes of drugs are currently available: sulphonylureas, biguanides (metformin), alpha-glucosidase inhibitors (acarbose) and insulin, each of which has a different mode and site of action. These standard pharmacological treatments may be used individually for certain types of patients, or may be combined in a stepwise fashion to provide more ideal glycaemic control for most patients. Adjunct treatments comprise a few pharmacological approaches which may help to improve glycaemic control by correcting some abnormalities frequently associated with NIDDM, such as obesity (serotoninergic anorectic agents) and hyperlipidaemia (benfluorex). There is intensive pharmaceutical research to find new drugs able to stimulate insulin secretion (new sulphonylurea or nonsulphonylurea derivatives, glucagon-like peptide-1), improve insulin action (thiazolidinediones, lipid interfering agents, glucagon antagonists, vanadium compounds) or reduce carbohydrate absorption (miglitol, amylin analogues, glucagon-like peptide-1). Further studies should demonstrate the superiority of these new compounds over the standard antidiabetic agents as well as their optimal mode of administration, alone or in combination with currently available drugs. [less ▲]

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See detailMétastases ganglionnaires, hépatiques et osseuses d'un chemodectome carotidien. A propos d'un cas
DEFRAIGNE, Jean ULg; Limet, Raymond ULg

in Journal de Chirurgie (1997), 134(7-8), 336-9

A case of malignant carotid body tumor with nodal, hepatic and bone metastases is reported. Carotid body chemodectomas are slow-growing tumors which invade local structures. These tumors are usually ... [more ▼]

A case of malignant carotid body tumor with nodal, hepatic and bone metastases is reported. Carotid body chemodectomas are slow-growing tumors which invade local structures. These tumors are usually benign but can occasionally produce local and distant metastases. Development of metastatic localizations is the only formal proof of malignancy as histology cannot distinguish between benign and malignant chemodectomas. Bilateral carotid arteriography gives the diagnosis. Surgery is the basis of treatment and should be performed early in the course to limit operative complications. Radiotherapy can be given as adjuvant treatment. [less ▲]

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See detailPd/SiO2-cogelled aerogel catalysts and impregnated aerogel and xerogel catalysts: Synthesis and characterization
Heinrichs, Benoît ULg; Noville, Francis ULg; Pirard, Jean-Paul ULg

in Journal of Catalysis (1997), 170(2), 366-376

Pd/SiO2 aerogel catalysts have been synthesized by cogelation of tetraethoxysilane with complex Pd2+[NH2-CH2-CH2-NH-(CH2)(3)-Si(OCH3)(3)](2) containing a hydrolysable silyl group. Pd catalysts have also ... [more ▼]

Pd/SiO2 aerogel catalysts have been synthesized by cogelation of tetraethoxysilane with complex Pd2+[NH2-CH2-CH2-NH-(CH2)(3)-Si(OCH3)(3)](2) containing a hydrolysable silyl group. Pd catalysts have also been prepared by impregnation of silica aerogels and xerogels with solutions of this complex or Pd2+(NH3)(4) followed by drying under hypercritical conditions or under vacuum. It appears that, in cogelled samples, the Pd2+ complex acts as a nucleation agent in the formation of silica particles. The resulting catalysts are then composed of completely accessible palladium crystallites with a diameter of about 2.3 nm located inside silica particles with a monodisperse microporous distribution centered on a hydraulic radius of 0.43 nm. The continuous meso- and macropore distribution is located in voids between particles and between aggregates constituted of those particles. In impregnated samples, it appears that Pd particles are located outside SiO2 particles. The relation between the texture of cogelled and impregnated catalysts and their behavior toward sintering has been studied in detail. In cogelled samples, it has been shown that Pd crystallites cannot migrate because they are trapped in the pores of SiO2 particles. These catalysts are sinterproof during hypercritical drying, When Pd crystallites are not trapped inside SiO2 particles, hypercritical drying leads to an extensive sintering of metal particles. During calcination of impregnated catalysts dried under vacuum, sintering occurs to a various extent depending on the support texture. The Pd crystallites size decreases when the pore size distribution is shifted toward the small sizes. (C) 1997 Academic Press. [less ▲]

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See detailCaractéristiques microbiologiques et organoleptiques du nététu du commerce.
N'dir, B.; Gningue, B. D.; Keita, N. G. et al

in Cahiers Agricultures (1997), 6

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See detailThe Photoabsorption Spectrum of Vinylchloride (C2H3Cl) in the 8-12 eV Range.
Locht, Robert ULg; Leyh, Bernard ULg; Hottmann, K. et al

in Chemical Physics (1997), 220

The photoabsorption spectrum of vinylchloride (C2H3Cl) has been measured using synchrotron radiation and has been analyzed in detail between 8-12 eV photon energy. Valence and virtual valence and Rydberg ... [more ▼]

The photoabsorption spectrum of vinylchloride (C2H3Cl) has been measured using synchrotron radiation and has been analyzed in detail between 8-12 eV photon energy. Valence and virtual valence and Rydberg transitions have been identified and classified. Tentative assignments were based on the ionization energies as measured by He(I)- and threshold photoelectron spectroscopy, as reported in the joined paper. Many features have been identified as being members of vibrational progressions belonging to the observed Rydberg series. [less ▲]

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See detailThe faint young sun climatic paradox: Influence of the continental configuration and of the seasonal cycle on the climatic stability
Longdoz, Bernard; François, Louis ULg

in Global and Planetary Change (1997), 14(3-4), 97-112

A quasi-three-dimensional climate model is used to study the early state of the Earth when the solar luminosity was 70% of the present value, Usually, climatic simulations going back to this period lead ... [more ▼]

A quasi-three-dimensional climate model is used to study the early state of the Earth when the solar luminosity was 70% of the present value, Usually, climatic simulations going back to this period lead to a completely frozen planet contrasting with the geologic evidences of sedimentary rock formation and thus of the presence of liquid water at the surface of the continents during the Archean (4.6-2.5 billion years before present). Here, several model simulations are performed for solar luminosities varying between 0.7 and 1 times the present value. Using the present-day continental configuration and taking the seasonal cycle into account, a steady state is found in which glaciation is complete but snow covers only some oceanic coasts, leaving the continents essentially snow-free. As a result, the albedo of the continental area is strongly reduced compared to that of the frozen ocean, Some continental temperatures can almost reach the freezing point of water in summer (-1 degrees C in the center of Eurasia). This result can be explained by the behavior of the detailed hydrologic cycle included in the model. During the decrease of the solar luminosity, the jump to a completely frozen Earth occurs when the solar luminosity reaches 0.86 times its present value. The behavior of the climatic system is substantially different with a global ocean configuration. In the absence of land surfaces, the meridional heat transport, explicitly calculated, is less effective and the glaciation of a model latitude zone does not lead to the glaciation of its equatorward neighbor. The climate instability is relatively local and the jump to the completely frozen state is much more progressive than in the case of the modem continental configuration. The role of the seasonal cycle in the paleoclimatic simulation is also studied. Due to the non-linearity of the model, removing the seasonal cycle drives the system to an increase of the annual mean planetary albedo and to a decrease of the relative value (0.82) of the critical solar luminosity at which the jump to the completely frozen solution occurs. [less ▲]

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See detailComment je traite les hypertensions réfractaires
Krzesinski, Jean-Marie ULg

in Revue Médicale de Liège (1997), 52(1), 2-6

L'hypertension artérielle réfractaire représente 10% des hypertensions artérielles traitées. La définition, arbitraire, consiste en la persistance de valeurs de pression artérielle au-delà de 140/90 mmHg ... [more ▼]

L'hypertension artérielle réfractaire représente 10% des hypertensions artérielles traitées. La définition, arbitraire, consiste en la persistance de valeurs de pression artérielle au-delà de 140/90 mmHg malgré une trithérapie antihypertensive dont un diurétique. Ce traitement a été administré à dose optimale pendant une durée suffisante. La reconnaissance des vraies hypertensions réfractaires est la première démarche diagnostique (bonne mesure de la pression artérielle et authenticité de l'augmentation de pression). Ensuite il convient de rechercher une non-observance, une forme secondaire d'hypertension artérielle ou encore une résistance thérapeutique liée à un excès de poids et à un hyperinsulinisme. Cette démarche permettra de proposer un schéma thérapeutique approprié visant à normaliser la pression artérielle, gage d'un risque cardio-vasculaire atténué. Une prise en charge globale des facteurs de risque cardio-vasculaire trouve ici une pleine implication. [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 detailZastosowanie ultrasonografii w diagnostyce klinicznej ukladu rozrodczego u bydla
Gajewski, Z.; Hanzen, Christian ULg; Thun, R. et al

in Nowa Weterynaria (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 detailEvolution du couvert vegetal dans la region de Kinshasa (1960-1987) selon une approche cartographique.
Tshibangu, K. W. T.; Engels, Patrick ULg; Malaisse, François ULg

in Geo-Eco-Trop (1997), 21(1-4),

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See detailObserved trends in total vertical column abundances of atmospheric gases from IR solar spectra recorded at the Jungfraujoch
Mahieu, Emmanuel ULg; Zander, Rodolphe ULg; Delbouille, Luc et al

in Journal of Atmospheric Chemistry (1997), 28(1-3), 227-243

Since 1984, about 15 000 high quality infrared solar spectra have been recorded with state-of-the-art grating and Fourier transform spectrometers at the International Scientific Station of the ... [more ▼]

Since 1984, about 15 000 high quality infrared solar spectra have been recorded with state-of-the-art grating and Fourier transform spectrometers at the International Scientific Station of the Jungfraujoch, Switzerland. Nonlinear least squares spectral curve fitting of selected microwindows containing isolated and well characterized lines of 20 telluric gases have allowed to retrieve their total vertical column abundances above the station, leading to observational data bases essential to derive long- and short-term changes experienced by these species during the last 12 years. In this paper, we focus on atmospheric gases of particular interest within the context of the EUROTRACTOR (Tropospheric Ozone Research) project; secular evolution as well as seasonal cycles of the minor constituents CH4, CO and of the trace gases C2H6, OCS, C2H2, HCN and H2CO are reported and discussed. The long-lived N2O is included as a tracer of the dynamic activity of the atmosphere. [less ▲]

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See detailPsychiatrie de liaison:regards sur une pratique de la psychologie médicale en hôpital général
Triffaux, Jean-Marc ULg

in Revue francaise de psychiatrie et de psychologie médicale (1997)

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See detailDynamique de défense du nid chez Symphodus ocellatus (Forsskål, 1775), poisson labridé méditerranéen. I. Comportements agonistiques entre le mâle territorial nidificateur et cinq autres espèces de labridés
Ylieff, Marc ULg; Michel, Christian ULg; Voss, Jacques

in Cahiers d'Ethologie (1997), 17(1), 49-74

This research in the field consists of a study of interspecific agonistic behaviour of territorial male in Symphodus ocellatus. This behaviour is useful for brood and nest defense. Four questions ... [more ▼]

This research in the field consists of a study of interspecific agonistic behaviour of territorial male in Symphodus ocellatus. This behaviour is useful for brood and nest defense. Four questions involving Symphodus ocellatus towards S. tinca, S. mediterraneus, S. roissali, Thalassoma pavo et Coris julis were investigated. The questions of interest were: (1) aggressors or intruders motivations (predation of the brood (a) and/or territorial conflicts (b)), (2) the recognition of this or that species (recognition studied with selective attacks by territorial male), (3) the organ(s) of perception used for this recognition and (4) the importance of territorial male investment in nest defense; this role could ensure a successful reproduction of the species. Our observations and experimentations (tested labrid fishes presented to T. males) allow us to affirm that in S. ocellatus, nesting territorial males recognize the various tested labrid fishes; that the organ of perception used for social recognition is the visual channel; that spawn protection insured by territorial male, a task guided by his visual system, is necessary towards menace of his congeners, but also the other fishes living in his habitat. Nevertheless, if it’s becoming clear that the Mediterranean labrid fishes have the ability to recognize and preferentially interact with particular individuals, the answer of the question 1, concerning aggressors motivations, is not yet clearly known. [less ▲]

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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 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 Color Purple - les Blues Pourpres d'Alice Walker
Sacré, Robert ULg

in Les Cahiers du Jazz (1997), 12

Un livre (1982) - un film ( Steven Spielberg, 1985)

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See detailSpecies assemblages and indicator species: The need for a flexible asymmetrical approach
Dufrêne, Marc ULg; Legendre, P.

in Ecological Monographs (1997), 67(3), 345-366

This paper presents a new and simple method to find indicator species and species assemblages characterizing groups of sites. The novelty of our approach lies in the way we combine a species relative ... [more ▼]

This paper presents a new and simple method to find indicator species and species assemblages characterizing groups of sites. The novelty of our approach lies in the way we combine a species relative abundance with its relative frequency of occurrence in the various groups of sites. This index is maximum when all individuals of a species are found in a single group of sites and when the species occurs in all sites of that group; it is a symmetric indicator. The statistical significance of the species indicator values is evaluated using a randomization procedure. Contrary to TWINSPAN, our indicator index for a given species is independent of the other species relative abundances, and there is no need to use pseudospecies. The new method identifies indicator species for typologies of species releves obtained by any hierarchical or nonhierarchical classification procedure; its use is independent of the classification method. Because indicator species give ecological meaning to groups of sites, this method provides criteria to compare typologies, to identify where to stop dividing clusters into subsets, and to point out the main levels in a hierarchical classification of sites. Species can be grouped on the basis of their indicator values for each clustering level, the heterogeneous nature of species assemblages observed in any one site being well preserved. Such assemblages are usually a mixture of eurytopic (higher level) and stenotopic species (characteristic of lower level clusters). The species assemblage approach demonstrates the importance of the 'sampled patch size,' i.e., the diversity of sampled ecological combinations, when we compare the frequencies of core and Satellite species. A new way to present species-site tables, accounting for the hierarchical relationships among species, is proposed. A large data set of carabid beetle distributions in open habitats of Belgium is used as a case study to illustrate the new method. [less ▲]

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See detailObesity and nutrition. The Belgian Luxembourg Child Study.
Guillaume, Michèle ULg; Lapidus, L.; Beckers, F. et al

in Obesity Research (1997)

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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 detailDesign for an Ipriflavone Multicenter European Fracture Study
Reginster, Jean-Yves ULg; Bufalino, L.; Christiansen, C. et al

in Calcified Tissue International (1997), 61(Suppl 1), 28-32

In order to investigate the efficacy of ipriflavone (i.p.) on the prevention of vertebral fractures and the effect on bone mineral density (BMD) in women with postmenopausal osteoporosis, a large ... [more ▼]

In order to investigate the efficacy of ipriflavone (i.p.) on the prevention of vertebral fractures and the effect on bone mineral density (BMD) in women with postmenopausal osteoporosis, a large multicentric European study was designed and is presently ongoing. Included in the study were 460 Caucasian, nonobese postmenopausal women aged > 45 and < 75 years, menopaused for at least 12 months. Inclusion was on the basis of a lumbar bone mineral density (BMD) lower than 2 SD compared with healthy women aged 50 years, corresponding to values below 0.860 g/cm2 (antero-posterior measurement) by Hologic QDR 1000. Women with prevalent vertebral fractures were excluded as well as those presenting secondary osteoporosis or having been treated with medications that could affect bone metabolism. This study was designed as a 3-year, double-blind, placebo-controlled, parallel group study that randomized the women to the oral administration of either 3 x 200 mg/day of i.p. or placebo. All patients received a daily supplement of 500 mg calcium. The primary purpose of the study was to evaluate the efficacy of i.p. in preventing vertebral nontraumatic fractures. Fracture is defined here as a > or = 20% decrease in any anterior, central, or posterior T4-L4 vertebral height. Blinded vertebral X-ray readings and vertebral morphometry have been centralized in an independent Center, with standardized evaluation of two experts. Power calculations have been based on the hypothesis that 21% of placebo-treated patients would fracture within 3 years and that treatment with i.p. would lead to a 50% reduction in the incidence of fracture. Statistical tests have been designed to have a power of 80%, with a type I error equal to 5%. Secondary endpoints were changes in vertebral, radial, and femoral BMD. Centralized controls on 100% BMD scans would ensure the good quality of BMD readings. This study should verify the hypothesis that i.p. significantly decreases the risk of vertebral fracture in postmenopausal, osteoporotic women. [less ▲]

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See detailAlternative techniques of hysterectomy.
NISOLLE, Michelle ULg; Donnez, Jacques

in New England Journal of Medicine [=NEJM] (1997), 336(4), 291-2

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See detailExpression of c-ets-1 mRNA is associated with an invasive, EMT-derived phenotype in breast carcinoma cell lines.
Gilles, Christine ULg; Polette, M.; Birembaut, P. et al

in Clinical & Experimental Metastasis (1997), 15(5), 519-26

We have previously observed in vitro that some stromal proteinases (MMP-2, MT1-MMP) were expressed or activated by invasive carcinoma cell lines exhibiting mesenchymal features, presumably acquired ... [more ▼]

We have previously observed in vitro that some stromal proteinases (MMP-2, MT1-MMP) were expressed or activated by invasive carcinoma cell lines exhibiting mesenchymal features, presumably acquired through an epithelial to mesenchymal transition (EMT). To examine the potential contribution of c-ets-1 to this phenotype, we have compared here the expression of c-ets-1 with invasiveness in vitro and expression of vimentin, E-cadherin, uPA, MMP-1 and MMP-3 in a panel of human breast cancer cell lines. Our results clearly demonstrate an association between c-ets-1 expression and the invasive, EMT-derived phenotype, which is typified by the expression of vimentin and the lack of E-cadherin. While absent from the two non-invasive, vimentin-negative cell lines, c-ets-1 was abundantly expressed in all the four vimentin-positive lines. However, we could not find a clear quantitative or qualitative relationship between the expression of c-ets-1 and the three proteinases known to be regulated by c-ets-1, except that when they were expressed, it was only in the invasive c-ets-1-positive lines. UPA mRNAs were found in three of the four vimentin-positive lines, MMP-1 in two of the four, and MMP-3 could not be detected in any of the cell lines. Intriguingly, MDA-MB-435 cells, which exhibit the highest metastatic potential of these cell lines in nude mice, expressed vimentin and c-ets-1, but lacked expression of these three proteinases, at least under the culture conditions employed. Taken together, our results show that c-ets-1 expression is associated with an invasive, EMT-derived phenotype in breast cancer cells, although it is apparently not sufficient to ensure the expression of uPA, MMP-1 or MMP-3, in the vimentin-positive cells. Such proteases regulation is undoubtedly qualified by the cellular context. This study therefore advances our understanding of the molecular regulation of invasiveness in EMT-associated carcinoma progression, and suggests that c-ets-1 may contribute to the invasive phenotype in carcinoma cells. [less ▲]

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