Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Peer Reviewed
See detailNITROGEN-RICH METAMORPHIC FLUIDS IN DEVONIAN METASEDIMENTS FROM BASTOGNE, BELGIUM
Darimont, Anne ULg; BURKE, E.; TOURET, J.

in Bulletin de Minéralogie (1988), 111(3-4), 321-330

Detailed reference viewed: 29 (2 ULg)
Full Text
Peer Reviewed
See detailNitroglycerin sensitises in healthy subjects CNS structures involved in migraine pathophysiology: evidence from a study of nociceptive blink reflexes and visual evoked potentials.
Di Clemente, Laura; Coppola, Gianluca; Magis, Delphine ULg et al

in Pain (2009), 144(1-2), 156-61

Nitroglycerin (NTG), a NO donor, induces an attack in migraine patients approximately 4-6 h after administration. The causative mechanisms are not known, but the long delay leaves room for a central ... [more ▼]

Nitroglycerin (NTG), a NO donor, induces an attack in migraine patients approximately 4-6 h after administration. The causative mechanisms are not known, but the long delay leaves room for a central effect, such as a change in neuronal excitability and synaptic transmission of various CNS areas involved in pain and behaviour including trigeminal nucleus caudalis and monoaminergic brain stem nuclei. To explore the central action of NTG, we have studied its effects on amplitude and habituation of the nociceptive blink reflex (nBR) and the visual evoked potential (VEP) before, 1 h and 4 h after administration of NTG (1.2 mg sublingual) or placebo (vehicle sublingual) in two groups of 10 healthy volunteers. We found a significant decrease in nBR pain and reflex thresholds both 1 and 4 h post-NTG. At the 4 h time point R2 latency was shorter (p=0.04) and R2 response area increased (p<0.01) after NTG but not after placebo. Habituation tended to become more pronounced after both NTG and placebo administration. There was a significant amplitude increase in the 5th VEP block (p=0.03) at 1h after NTG and in the 1st block (p=0.04) at 4 h. VEP habituation was replaced by potentiation at both delays after NTG; the change in habituation slope was significant at 1h (p=0.02). There were no significant VEP changes in subjects who received sublingual placebo. In conclusion, we found that in healthy subjects sublingual NTG, but not its vehicle, induces changes in a trigeminal nociceptive reflex and an evoked cortical response which are comparable to those found immediately before and during an attack of migraine. These changes could be relevant for the attack-triggering effect of NTG in migraineurs. [less ▲]

Detailed reference viewed: 20 (1 ULg)
Full Text
Peer Reviewed
See detailNitroglycerin-induced nNOS increase in rat trigeminal nucleus caudalis is inhibited by systemic administration of lysine acetylsalicylate but not of sumatriptan
Pardutz, A.; Szatmari, E.; Vecsei, L. et al

in Cephalalgia : An International Journal of Headache (2004), 24(6), 439-445

Systemic administration of nitroglycerin (NTG), a nitric oxide (NO) donor, in migraineurs triggers after several hours an attack of which the precise mechanisms are unknown. We found previously in rats ... [more ▼]

Systemic administration of nitroglycerin (NTG), a nitric oxide (NO) donor, in migraineurs triggers after several hours an attack of which the precise mechanisms are unknown. We found previously in rats that nitroglycerin (10 mg/kg s.c.) is able to increase significantly after 4 h the number of neuronal nitric oxide synthase (nNOS)-immunoreactive neurones in the cervical part of trigeminal nucleus caudalis. In the present experiments, we demonstrate that the 5-HT1(B/D) agonist sumatriptan (0.6 mg/kg s.c.) does not alter this phenomenon when given before NTG. By contrast, pretreatment with lysine acetylsalicylate (50 mg/kg i.m.) attenuates the NTG-induced nNOS expression in the superficial laminae of trigeminal nucleus caudalis. These findings suggest that effect of NTG on nNOS at a high dosage may involve the cycloxygenase pathway and that activation of the peripheral 5-HT1(B/D) receptors is not able to modify this effect. These data could help to better understand the role of NO in the pathogenesis of headaches and the action of antimigraine drugs. [less ▲]

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailNitrosomonas europaea-like bacteria detected as the dominant beta-subclass Proteobacteria ammonia oxidisers in reference and limed acid forest soils
Carnol, Monique ULg; Kowalchuk, G. A.; De Boer, W.

in Soil Biology & Biochemistry (2002), 34

Net nitrification in intact soil cores and the community of ammonia-oxidising bacteria were studied in acid Norway spruce (Picea abies (L.) Karst) and sessile oak (Quercus petraea (Matt. Lieb.)) soils ... [more ▼]

Net nitrification in intact soil cores and the community of ammonia-oxidising bacteria were studied in acid Norway spruce (Picea abies (L.) Karst) and sessile oak (Quercus petraea (Matt. Lieb.)) soils (Haute Ardenne, east Belgium) 18 months after treatment with 5 t ha(-1) dolomite lime. Liming caused a significant increase in nitrification in the upper soil layers (0.15 m) of both stands. DGGE (denaturing gradient gel electrophoresis) profiling after P-subclass ammonia oxidiser-specific polymerase chain reaction (PCR), combined with hybridisation and sequencing of excised DGGE bands revealed a dominance of Nitrosomonas europaea-like sequences, independent of soil horizon, tree species and lime treatment. A minority Nitrosospira-like population was detected, which showed affinity to nitrosospiras previously detected in acid soil. These results contrast with several reports suggesting a dominance of Nitrosospira-like organisms among ammonia oxidiser communities in acid soils. (C) 2002 Elsevier Science Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 40 (2 ULg)
Full Text
Peer Reviewed
See detailNitrous oxide and xenon prevent amphetamine-induced carrier-mediated dopamine release in a memantine-like fashion and protect against behavioral sensitization
David, Hélène N.; Ansseau, Marc ULg; Lemaire, Michelle ULg et al

in Biological Psychiatry (2006), 60(1), 49-57

Background. Amphetamine administration induces stimulation-independent dopainine release in the nucleus accumbens (NAcc) through reverse dopamine transport, a critical neurochemical event involved in its ... [more ▼]

Background. Amphetamine administration induces stimulation-independent dopainine release in the nucleus accumbens (NAcc) through reverse dopamine transport, a critical neurochemical event involved in its psycbostimulant action, and, furthermore decreases stimulation-dependent vesicular dopamine release. These effects may involve possible indirect glutamateigic mechanisms. Methods: We investigated the effiects of nitrous oxide and xenon, which possess antagonistic action at the N-methyl-D-aspartate (NMDA) receptor, on brain slices ex vivo on aniphetamine-induced changes in carrier-mediated and KCI-evoked dopamine release in the NAcc, and in vivo on ampbetamine-induced locomotor sensitization Results: Like the low-affininity NMDA receptor antagonist memantine, but not the prototypical compound MK-801, nitrous oxide and xenon at appropriate concentrations blocked both the increase in carrier-mediated dopamine release and locomotor sensitization produced by amphetamine. Conclusions: In contrast to what has generally been found using prototypical NMDA receptor antagonists, these data regarding the effect qf memantine, nitrous oxide, and xenon support the hypothesis that activation qf certain NMDA receptors (possibly those qf containing the NR1a/NR2D subunit) in the NAcc is involved in the ampbetamine-induced increase in carrier-mediated dopamine release and the development qf behavioral sensitization to amphetamine. Nitrous oxide, xenon, and memantine may be of therapeutic interest for treating drug dependence. [less ▲]

Detailed reference viewed: 79 (12 ULg)
Full Text
Peer Reviewed
See detailNitrous oxide emissions using quantum cascade laser spectrometry over a production crop: preliminary results
SALERNO, Giovanni ULg; Aubinet, Marc ULg; Joly, Joly et al

Poster (2013, September 18)

Amongst the greenhouse gases, nitrous oxide is recognized as having the greatest greenhouse forcing potential and as being the third in terms of radiative forcing. Agriculture is known to be the major ... [more ▼]

Amongst the greenhouse gases, nitrous oxide is recognized as having the greatest greenhouse forcing potential and as being the third in terms of radiative forcing. Agriculture is known to be the major anthropic emitter. This work is part of the FERTECOL project and its objective is to measure the emissions of nitrous oxide by a production crop with an eddy covariance system. The measurements extent over the growth period, cover a large range of climatic conditions and capture peak events associated with fertilization. The measurements, started in April 2013, are carried at the Lonzée Terrestrial Observatory (50°33'5.83"N- 4°44'46.22"E). On this year, the crop is planted with winter wheat. A Quantum Cascade Laser Absorption Spectrometer (QCLAS, GSMA, France) is used to measure nitrous oxide as well as water vapor and carbon dioxide at a frequency of 5 hertz. The fluxes are computed using the Eddy Covariance technique adapting standards quality and corrections procedures set up for CO2 fluxes to N2O. Standard meteorological measurements are performed in parallel. The analysis will present response of the fluxes to environmental variables as well as to fertilization events during the season. [less ▲]

Detailed reference viewed: 30 (4 ULg)
Peer Reviewed
See detailNitroxide reduction by electron transfer from the Eosin triplet state: electron paramagnetic resonance and flash photolysis studies
Seret, Alain ULg; Gandin, Ezio; Van de Vorst, Albert

in Journal of Photochemistry (1987), 38

The paramagnetism loss of nitroxide, photosensitized by eosin, was analysed in basic aqueous and micellar media using electron paramagnetic resonance (EPR) spectroscopy. In cetyltrimethylammonium bromide ... [more ▼]

The paramagnetism loss of nitroxide, photosensitized by eosin, was analysed in basic aqueous and micellar media using electron paramagnetic resonance (EPR) spectroscopy. In cetyltrimethylammonium bromide micelles and sodium bis(2-ethylhexyl)sulphosuccinate—n-heptane microemulsions, the paramagnetism decay curves are monoexponential. This is not the case in neat water and sodium dodecylsulphate micelles, for which more complex decays were recorded. It is concluded from flash photolysis measurements that the eosin triplet state is physically quenched by nitroxide and that the latter can be reduced by electron transfer either from the triplet state or from the semireduced form of eosin. This sequence of reactions was confirmed by experiments in micellar media and leads to an understanding of the EPR results. [less ▲]

Detailed reference viewed: 27 (0 ULg)
Full Text
See detailThe Nitroxides in Polymerization
Olive, Gilles ULg; Göttgens, Christianne; Smulders, Wilfred et al

Poster (1999, May 20)

The Nitroxides in Polymerization arepresented here with explanation.

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailNiveau de contamination et spéciation des métaux lourds dans l'Oued Fès et l'Oued Sebou.
Bouezmarni, Mohamed ULg; Debbaut, Vincent ULg; Diouri, S. El Edrissi et al

Conference (2010)

Detailed reference viewed: 41 (7 ULg)
See detailLe niveau de lecture à l'entrée du secondaire en Communauté française de Belgique: Des compétences fragiles et si diverses…
Lafontaine, Dominique ULg

in Enjeux : Revue de Formation Continuée et de Didactique du Français (1997), 41-42(129), 161

Detailed reference viewed: 20 (1 ULg)
Full Text
Peer Reviewed
See detailNiveau de production et fécondité des vaches et des troupeaux laitiers wallons
Chapaux, Philippe; Glorieux, Géry; Hanzen, Christian ULg

Poster (2013, December)

Detailed reference viewed: 10 (0 ULg)
Peer Reviewed
See detailNiveau protéique des régimes à base de maïs deshydraté pour les jeunes bovins en croissance engraissement
Cordiez, Emile ULg; Bienfait, Jean-Marie ULg; Lambot, Olivier et al

in Annales de Médecine Vétérinaire (1974), 118

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailLes niveaux d'analyse dans la microstructure de l'Atlas linguistique de la Wallonie
Baiwir, Esther ULg

in Estudis Romànics (2014), 36

Le lecteur de l'ALW constate rapidement que les formes phonétiques n'y sont pas livrées brutes sur des cartes, comme dans les atlas de France par région, ni sous forme de liste, mais bien dans une ... [more ▼]

Le lecteur de l'ALW constate rapidement que les formes phonétiques n'y sont pas livrées brutes sur des cartes, comme dans les atlas de France par région, ni sous forme de liste, mais bien dans une présentation structurée en paragraphes, regroupant selon des critères variables des formes phonétiques distinctes. Après avoir proposé une schématisation de la microstructure du projet, sur base d'une notice-modèle (1), nous détaillerons ces critères de classement (phonologique, morphologique, syntaxique, étymologique, motivationnel ou encore sémantique; 2). Chaque paragraphe de matériaux porte un titre, qui représente d'une façon plus ou moins abstraite les matériaux qu'il comporte. Ce titre peut prendre différentes formes: une orthographe dite « Feller » ou des types reconstruits plus abstraits. Nous tenterons de montrer en quoi ces deux images très différentes des matériaux ne sont pas réductibles l'une à l'autre (3). [less ▲]

Detailed reference viewed: 38 (6 ULg)
See detailLes niveaux de contamination par les métaux lourds chez deux espèces de Delphinidae: Stenella coeruleoalba et Delphinus delphis
Das, Krishna ULg

Master's dissertation (1996)

Les cétacés occupent le sommet des réseaux trophiques marins. Cette position, combinée à leur longue durée de vie et leur statut d’homéotherme favorise une accumulation de polluants dans leurs tissus ... [more ▼]

Les cétacés occupent le sommet des réseaux trophiques marins. Cette position, combinée à leur longue durée de vie et leur statut d’homéotherme favorise une accumulation de polluants dans leurs tissus (Bouquegneau et al., 1996). Ces animaux s’avèreraient donc d’excellents bioindicateurs potentiels, reflétant la contamination de leur environnement. Dans le cadre de cette étude, les niveaux de mercure total, de sélénium, de cadmium, de zinc, de nickel, de chrome, de plomb, de cuivre et de fer ont été évalués dans différents tissus prélevés sur des dauphins bleus et blancs (Stenella coeruleoalba) et des dauphins communs (Delphinus delphis) provenant du Golfe de Gascogne. Les influences combinées de l’âge, du sexe et du statut reproducteur ont été analysées. Les résultats obtenus lors de nos différentes analyses ont été également confrontés à ceux de la littérature afin de réaliser une comparaison avec d’autres sites. [less ▲]

Detailed reference viewed: 85 (9 ULg)
Peer Reviewed
See detailNiveaux de pollution en ammoniac, gaz carbonique et bactéries dans l'air des locaux de maternité et de post-sevrage
Nicks, Baudouin ULg; Dechamps, P.; Canart, Bernard et al

in 22èmes Journées de la Recherche Porcine en France (1990)

Detailed reference viewed: 18 (0 ULg)
Full Text
Peer Reviewed
See detailNiveaux du plomb sanguin, du plomb urinaire, de l’acide δ-aminolévulinique et des porphyrines urinaires chez les personnes vivant à Kinshasa, R.D. Congo : une étude pilote de biosurveillance
Mputu Malolo, Corneille-Liévin; Ndelo di Phanzu, Josaphat; Marini Djang'Eing'A, Roland ULg et al

Conference (2013, October 18)

Objectives: Existing naturally in the earth’s crust, Lead is a widely used heavy metal. It is an environment toxicant that may deleteriously affect nervous, hematopoietic, skeletal, renal, endocrine and ... [more ▼]

Objectives: Existing naturally in the earth’s crust, Lead is a widely used heavy metal. It is an environment toxicant that may deleteriously affect nervous, hematopoietic, skeletal, renal, endocrine and reproductive systems. Lead is classified in its inorganic form as possible human carcinogen (group 2A) by IARC. Exposure to lead in the environment continues to be a serious public health problem for all ages. Children are particularly susceptible to lead poisoning. They absorb more lead from their environment and their developing central nervous systems are vulnerable to the toxicant. During the last twenty years, important measures of public health were undertaken in several countries to decrease lead exposure. In the best of our knowledge, this is not the case in D.R. Congo. A study indicated a relatively important lead impregnation of the Kinshasa population (mean 120 μg/L). However, there have been no reported studies in the evaluation of the relationship between urinary lead, urinary δ-aminolevulinic acid (δ-AlaU) and urinary porphyrins and lead blood level in Congolese people. This is the aim of this study targeting at first people living in Kinshasa. Methods: Blood lead and urinary lead levels were measured using inductively coupled plasma mass spectrometry. The Bio-Rad ALA/PBG by Column Test and spectrophotometer method were used to quantify the concentration of δ-Ala in urine. The separation of porphyrins was carried out by HPLC coupled with fluorescence detector. Results: 37% of studied population presented blood lead levels above the 100 μg/L threshold (geometric mean: 133.29 μg/L) with a higher concentration in women than in men (140.30 μg/L vs 130.78 μg/L). 50% of children (0-17 years) presented blood lead levels above the 100 μg/L threshold and 43% of the same population presented blood lead levels above 50 μg/L as accepted nowadays in US. In the adult population, some targeted occupations were found to be associated with high blood lead. A small correlation was observed between urinary lead and blood lead, but no correlation was noticed between δ-AlaU and Porphyrins with lead blood levels. Conclusion: This study confirmed a relatively important Pb impregnation of the Kinshasa population and the existence of a major public health issue requiring corrective actions and the implementation of an appropriate regulation. Also, urinary lead, urinary δ-Ala and urinary porphyrins seems to not to be sensitive markers for monitoring exposure to lead. [less ▲]

Detailed reference viewed: 47 (9 ULg)
Full Text
Peer Reviewed
See detailNíveis de pertinência da repetição: a noção de figura e fundo e a linearidade do significante
Lindenberg Lemos, Carolina ULg

Conference (2013, May 23)

En demeurant sur les éléments répétitifs des textes, nous seront parfois confrontés à une montée de tension qui semble être liée précisément à cette répétition. Le fait même de l'insistance dans un seul ... [more ▼]

En demeurant sur les éléments répétitifs des textes, nous seront parfois confrontés à une montée de tension qui semble être liée précisément à cette répétition. Le fait même de l'insistance dans un seul élément concentre progressivement les contenus présents dans un centre à chaque fois plus compact. En d'autres termes, une relation d'attente est établie entre le sème duratif d'un procès et le sème terminatif (Greimas & Courtés, 1993: 388). D'autres répétitions, par contre, ne produisent pas ces mêmes impactes. Nous les prenons pour naturelles, et quelques fois pour un élément de cohésion, mais rien de surprenant. Cette hésitation entre les différentes valeurs liées au même mécanisme syntactique nous a amené à la question du niveau de pertinence de la répétition pour les effets observés. Les niveaux d'analyse linguistique selon Benveniste (1995: 127 et ss.) ne se sont pas prouvés productifs, vu que les répétitions dans un même niveau sont parfois pertinentes et parfois pas. Cela peut se vérifier, par exemple, dans l'analyse des rimes d'un poème comme « The raven » de Allan Poe, où la réitération sonore est créatrice de tension. En contraste, les rimes du sonnet 130 de Shakespeare « My mistress' eyes are nothing like the sun » sont aussi signifiantes, mais ne portent pas le même genre de tension. La différence semble demeurer dans le degré saillant de la répétition, c'est-à-dire, si elle est présentée en premier plan ou en arrière-plan. Pour expliciter cette relation, nous faisons appelle à la notion de figure et de fond dans les termes où elle a été incorporée en linguistique (Talmy, 2000; Cadiot & Visetti, 2001). Nous verrons donc que, au delà de la relation spatial présente dans cette notion, elle peut être aussi comprise dans un sens temporel, c'est-à-dire, ce qui a été présenté dans un premier moment comme figure peut passer, dans un deuxième moment, au statut de fond pour une nouvelle figure qui est introduite dans le champ de présence. Cet enchaînement temporel se révèle ainsi essentiel pour l'appréhension de la tension. La linéarité du signifiant apparaît comme une condition pour cet effet, en contraste avec la liberté de lecture des signifiants organisés dans l'espace. Cet exposé propose ainsi d'expliciter la recherche du niveau auquel la répétition devient pertinente pour l'appréhension de la tension en tant qu'effet discursif. Dans ce parcours, nous discuterons, à l'aide d'exemples, l’interaction d'instruments théoriques divers comme la tensivité, la linéarité et la notion figure/fond, pour arriver à une meilleure catégorisation de la position relative de la répétition dans les textes. [less ▲]

Detailed reference viewed: 10 (1 ULg)
See detailNivelles et Namur : deux maisons francophones d’Annonciades aux Pays-Bas méridionaux (17e-18e s.)
Henneau, Marie-Elisabeth ULg

in Dinet, Dominique; Moracchini, Pierre; Portebos, Marie-Emmanuel (Eds.) Jeanne de France et l'Annonciade (2004)

Detailed reference viewed: 20 (3 ULg)
See detailNizzoli, Marcello
Prina, Daniela ULg

in Atkinson, Harriet; Edwards, Clive; Kettley, Sarah (Eds.) et al Encyclopedia of Design (in press)

Detailed reference viewed: 3 (0 ULg)