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See detailChanger son système d'information, penser l'organisation plus que la technique : illustration avec le passage à Alma à l’Université de Liège
Renaville, François ULg

Scientific conference (2015, June 22)

Présentation du projet de migration de Aleph et SFX vers le système de gestion de bibliothèque (SGB) Alma d'août 2014 à février 2015.

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See detailChanges in acid-base balance and related physiological responses as a result of external hypercapnia during the second half of incubation in the chicken embryo.
Everaert, Nadia ULg; De Smit, L.; Debonne, M. et al

in Poultry science (2008), 87(2), 362-7

This study investigated the effect of high CO2 (4%) from embryonic day (ED)10 until ED16 on the acid-base balance and related parameters in the chicken embryo. From ED10 to ED16, blood was taken from a ... [more ▼]

This study investigated the effect of high CO2 (4%) from embryonic day (ED)10 until ED16 on the acid-base balance and related parameters in the chicken embryo. From ED10 to ED16, blood was taken from a vein from the chorioallantois membrane and was analyzed for pH, partial pressure of CO2, partial pressure of O2 (pO2), [HCO3(-)], [K+], and [Ca2+]. Allantoic fluid was taken for measurement of pH, NH3-N, phosphate, and calcium concentration. The right tibia was ashed, and calcium was measured with atomic absorption spectroscopy. Embryos exposed to high CO2 showed a consistent higher blood pH than control embryos. Notwithstanding this alkalosis, bicarbonate concentration was significantly higher in the CO2 group from ED12 until ED16. Potassium concentration in the blood was significantly higher in the CO2 group from ED11 until ED16. The pH of the allantois was significantly higher on ED14 and ED15. Ammonia N concentration was significantly higher in the CO2-incubated embryos on ED12 and ED13, whereas phosphate did not differ between groups. Calcium per tibia dry weight did not differ between incubation conditions. We can conclude that embryos adapt to high CO2 during the second half of incubation by increasing blood HCO3(-). It appears that this increase in HCO3(-)is mainly the result of the stimulated intracellular exchange of H+ with K+, although temporary reabsorption of HCO3(-)by the kidney cannot be excluded. [less ▲]

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See detailChanges in Activity Patterns and Intergroup Relationships After a Significant Mortality Event in Commensal Long- Tailed Macaques (Macaca Fascicularis) in Bali, Indonesia
Brotcorne, Fany ULg; Fuentes, Agustin; Wandia, I Nengah et al

in International Journal of Primatology (2015), 36(3), 548566

Little is known regarding behavioral and social responses of free-ranging primates to demographic changes emerging from significant mortality events. Here, we report on the activity patterns and ... [more ▼]

Little is known regarding behavioral and social responses of free-ranging primates to demographic changes emerging from significant mortality events. Here, we report on the activity patterns and intergroup sociospatial relationships in a commensal population of long-tailed macaques (Macaca fascicularis) in Bali, Indonesia, that underwent a significant mortality event in summer 2012. During the period of interest, we noted heightened mortality in three of the five social groups present in this population, with adult females and juveniles experiencing higher mortality rates than adult and subadult males. Limited diagnostic data regarding pathogen identification and a lack of any conclusive etiology of the deaths prevent our ascertainment of the agent(s) responsible for the observed mortality, but given the characteristics of the event we assume it was caused by a transmissible disease outbreak. Comparing the pre- and postmortality event periods, we found significant differences in activity patterns, including a decreased proportion of affiliation in adult females. This result is likely indicative of enhanced social instability induced by the high mortality of adult females that constitute the stable core of macaque social structure. A higher social tension between groups after the mortality event was indicated by more frequent and intense agonistic intergroup encounters. Intergroup conflict success was inversely proportional to the rate of mortality a group suffered. Our results illustrate how changes in demographic structure caused by significant mortality events may have substantial consequences on behavior and social dynamics in primate groups and at the level of a population. [less ▲]

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See detailChanges in albumen pH due to higher CO2 concentrations during the first ten days of incubation
Bruggeman, V.; De Smit, L.; Tona, K. et al

Conference (2006)

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See detailChanges in amino acid content during floral induction in the leaf exudate collected form the long day plant Arabidopsis thaliana
Corbesier, Laurent; Lejeune, Pierre; Bernier, Georges et al

Poster (2000)

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See detailChanges in ascorbic acid content and ascorbate peroxidase activity during the development of Acetabularia mediterranea
Castillo, F. J.; Cotton, G.; Kevers, Claire ULg et al

in Differentiation (1986), 33(1), 17-23

[No abstract available]

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See detailChanges in atmospheric composition discerned from long-term NDACC measurements: trends in direct greenhouse gases derived from infrared solar absorption spectra recorded at the Jungfraujoch station
Mahieu, Emmanuel ULg; Duchatelet, Pierre ULg; Zander, Rodolphe ULg et al

Poster (2011, October 25)

The University of Liège (ULg) is operating -under clear sky conditions- two state-of-the-art Fourier Transform Infrared (FTIR) spectrometers at the high-altitude research station of the Jungfraujoch ... [more ▼]

The University of Liège (ULg) is operating -under clear sky conditions- two state-of-the-art Fourier Transform Infrared (FTIR) spectrometers at the high-altitude research station of the Jungfraujoch (Swiss Alps, 46.5ºN, 3580m asl), within the framework of the Network for the Detection of Atmospheric Composition Changes (NDACC). Routine FTIR operation started in 1984. Since then, it has been continued without disruption, allowing collecting more than 45000 high-resolution broadband IR solar absorption spectra, between 2 and 16 µm, using either HgCdTe or InSb detectors as well as a suite of optical filters. Typically, the spectral resolutions achieved lie in the 0.003 to 0.009 cm-1 interval while signal-to-noise ratios of 1000 and more are reached. Numerous narrow-band IR spectra essentially recorded from 1976 to 1989 with grating instruments are also available. Their analyses with modern tools have recently started [Bader et al., 2011] and will be pursued to consistently extend our datasets back in the 1970s. Geophysical parameters are deduced from the ULg observational database either with the SFIT-1, SFIT-2 or PROFFIT-9 algorithm, allowing producing total column time series of the target gases. In addition, information on their vertical distributions with altitude can generally be derived when using SFIT-2 or PROFFIT-9 which both implement the Optimal Estimation Method of Rodgers [1990]. Presently, more than two dozen atmospheric species are systematically retrieved from the Jungfraujoch observations, allowing the monitoring of key constituents of the Earth's atmosphere which play important roles in stratospheric ozone depletion and/or in global warming. This communication will focus on the direct and major greenhouse gases available from our database, namely water vapor, CO2, CH4, N2O, tropospheric ozone, CFC-11, CFC-12, HCFC-22, CCl4, SF6, as well as CF4 which has recently been added to our targets list [Duchatelet et al., 2011]. Trends and associated uncertainties characterizing the available -and often multi-decadal- time series have been derived or updated with a statistical bootstrap resampling tool [Gardiner et al., 2008], they will be presented and critically compared with data available from the literature. [less ▲]

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See detailChanges in biting characteristics recorded using the inertial measurement unit of a smartphone reflect differences in sward attributes
Andriamandroso, Andriamasinoro ULg; Lebeau, Frédéric ULg; Bindelle, Jérôme ULg

in Guarino, Marcella; Berckmans, Daniel (Eds.) Precision Livestock Farming '15 (2015, September)

Accurate monitoring of grazing activity at individual cow level would provide useful information to farmers to improve the management of their animals and pastures in intensive dairy systems. Pasture ... [more ▼]

Accurate monitoring of grazing activity at individual cow level would provide useful information to farmers to improve the management of their animals and pastures in intensive dairy systems. Pasture attributes, starting with sward height, influence grazing behaviour and bites characteristics. In an attempt to link sward height to an individual automated detection of biting behaviour, a series of recording sessions of 4×3 days were realized on a ryegrass pasture with two contrasting heights (5 and 15 cm) over the grazing season (from July to October) with 4 dry red-pied cows equipped with the inertial measurement unit (IMU) of a smartphone on a halter, recording acceleration data at 100Hz. The behaviours were video-recorded. The number of grazing bouts performed during grazing trends to increase when the grass is highest. Fourier transforms of acceleration data showed that grazing bouts were characterized by a distinctive acceleration peak which frequency ranged between 1.02Hz and 1.46Hz whatever the sward height. It corresponded to the uprooting of grass frequency in the biting movement when compared with the observation in the video recordings and it could be used to improve automated grazing behaviour detection and to remotely characterize bites. These results show that some bite characteristics are influenced by sward height and automated individual monitoring of grazing behaviour is possible. An extension of this methodology should allow analysing more deeply the grazing behaviour of cattle in order to determine number of bites and possibly to link it to biomass intake. [less ▲]

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See detailChanges in brain anatomy in focal hand dystonia
Garraux, Gaëtan ULg; Bauer, Andrew; Hanakawa, Takashi et al

in Annals of Neurology (2004), 55(5), 736-739

No consistent cerebral anatomical abnormality has ever been reported in primary focal hand dystonia (FHD). The present voxel-based morphometry study showed a significant bilateral increase in gray matter ... [more ▼]

No consistent cerebral anatomical abnormality has ever been reported in primary focal hand dystonia (FHD). The present voxel-based morphometry study showed a significant bilateral increase in gray matter in the hand representation area of primary somatosensory and, to a lesser extent, primary motor cortices in 36 patients with unilateral FHD compared with 36 controls. The presence of anatomical changes in the perirolandic cortex for the unaffected hand as well as that for the affected hand suggests that these disturbances may be, at least in part, primary. [less ▲]

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See detailChanges in brain estrogen synthase activity rapidly modulate male sexual behavior in Japanese quail
Cornil, Charlotte ULg

Conference (2003)

Testosterone activates male sexual behavior partly through its conversion into 17β-estradiol (E2) by the enzyme aromatase in the preoptic area. The classical mechanism of action for E2 involves changes in ... [more ▼]

Testosterone activates male sexual behavior partly through its conversion into 17β-estradiol (E2) by the enzyme aromatase in the preoptic area. The classical mechanism of action for E2 involves changes in gene transcription resulting in slow effects on behavior. In parallel, aromatase activity (AA) in the brain is also controlled by slow genomic mechanisms including mainly an increase in transcription following exposure to testosterone or its metabolites. However, rapid effects of E2 in the brain mediated by non-genomic mechanisms have also been documented. In parallel, it has recently been shown that AA can be rapidly modulated (within min) in vitro by changes in intracellular calcium concentration such as those produced by neurotransmitter action. These changes in enzymatic activity could result in rapid changes in the bioavailability of E2 obviously required to sustain rapid effects of this steroid. We investigated here the possible significance of the rapid modulations of AA in the control of male sexual behavior by quantifying the acute effects of single IP injections of E2 or VorozoleTM (VOR), a non-steroidal aromatase inhibitor, on male sexual behavior in quail. E2 (500µg/kg) injected 15 min before testing significantly stimulated copulatory behavior in castrated birds chronically treated with a low dose of T (2 mm long Silastic implant) unable by itself to elicit a complete copulatory sequence in most birds. VOR (30 mg/kg) significantly reduced copulation in gonadally intact males and in castrates treated with 40 mm T implants (CX+T40). Maximal effects were observed between 30 and 45 min after injection. VOR also inhibited appetitive sexual behavior measured by the rate of rhythmic cloacal sphincter movements in CX+T40 birds with a maximal effect at 30 min. Taken together, these data show that the rapid modulation of the availability of E2 in the brain rapidly affects male sexual behavior [less ▲]

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See detailChanges in breath 13CO2/12CO2 during exercise of different intensities.
Gautier, J. F.; Pirnay, Freddy ULg; Lacroix, M. et al

in Journal of Applied Physiology (Bethesda, Md. : 1985) (1996), 81(3), 1096-102

The measurement of breath 13CO2/12CO2 is commonly used during exercise to evaluate the oxidation rate of exogenous carbohydrates enriched in 13C. The aim of this study was to investigate whether exercise ... [more ▼]

The measurement of breath 13CO2/12CO2 is commonly used during exercise to evaluate the oxidation rate of exogenous carbohydrates enriched in 13C. The aim of this study was to investigate whether exercise itself affects the 13C/12C ratio in expired air CO2 in relation to exercise intensity. The relative abundance of 13C and 12C in expired air CO2 was determined by isotoperatio mass spectrometry and expressed as delta 13C (in %o) by using Craig's formula and calibrated standards. Five healthy young men exercised on a treadmill after an overnight fast during > or = 105 min on four occasions and in a randomized order. Work rates were performed at approximately 30, 45, 60, and 75% of their maximal O2 uptake (VO2max). Delta 13C in expired air CO2 and respiratory exchange ratio (RER) were determined every 15 or 30 min during exercise. At 30 and 45% VO2max, a slight and not statistically significant increase in delta 13C was observed at 30 min. In contrast, at 60 75% VO2max, the rise was statistically significant and averaged 0.83 and 0.99%o, respectively. Average delta 13C (between 0 and 105 min) progressively increased with the intensity of exercise. Individual values of delta 13C and RER were positively correlated (r = 0.653, P = 0.002) as were values of delta 13C and endogenous carbohydrates utilized (r = 0.752, P < 0.001). Factitious or "pseudooxidation" of a 13C-enriched exogenous glucose load (indeed noningested) was calculated from the changes in expired air delta 13C. Over the whole period of exercise it was not statistically significant at 30 and 40% VO2max. However, over the first 60 min of exercise, such pseudooxidation of exogenous glucose was significant at 30 and 45% VO2max. In conclusion, by modifying the mix of endogenous substrates oxidized, exercise at 60% VO2max and above significantly increases the 13C/12C ratio in expired air CO2. At these intensities, this could lead to overestimation of the oxidation of 13C-labeled substrates given orally. At lower intensities of exercise, such overestimation is much smaller an affects mainly the values recorded during the initial part of the exercise bout. [less ▲]

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See detailChanges in Bronchial Responsiveness, Circulating Leucocytes and Ex Vivo Cytokine Production by Blood Monocytes after Paf Inhalation in Allergic Asthmatics
Louis, Renaud ULg; Degroote, D.; Bury, Thierry ULg et al

in European Respiratory Journal (1995), 8(4), 611-8

We investigated the effects of inhaled platelet-activating factor (PAF) on methacholine bronchial responsiveness, circulating leucocyte counts, and ex vivo tumour necrosis factor alpha (TNF alpha) and ... [more ▼]

We investigated the effects of inhaled platelet-activating factor (PAF) on methacholine bronchial responsiveness, circulating leucocyte counts, and ex vivo tumour necrosis factor alpha (TNF alpha) and interleukin-1 (IL-1) production from blood monocytes in eight allergic asthmatics. Bronchial responsiveness was defined as the provocative concentration of methacholine causing a 20% decrease in forced expiratory volume in one second (PC20). Circulating leucocytes were counted by means of an automatic haemocytometer, and cytokines were measured with specific immunoassays. The different variables were measured before and 4, 24, 48, 72 and 168 h after a PAF (225 micrograms), a lyso-PAF (225 micrograms) and a saline bronchial challenge. When compared with lyso-PAF and saline, inhalation of PAF resulted in a significant decrease in PC20 over a period of one week. Two falls in bronchial responsiveness were identified, the first by 4 h and the second beginning 48 h and reaching a maximum by 168 h. The increases in spontaneous TNF alpha and IL-1 production which occurred during the week after both PAF, lyso-PAF and saline, did not differ significantly. Likewise, the changes in circulating neutrophil counts, characterized by a transient rise by 4 h after PAF and lyso-PAF but not saline, followed by a fall by 24 h and a persistent decrease until 168 h, were not significantly different after PAF, lyso-PAF and saline. On the other hand, in comparison with lyso-PAF and saline, inhaled PAF caused a significant protracted augmentation in circulating eosinophil counts, which was maximal by 48 h but did not correlate with the delayed decline in PC20.(ABSTRACT TRUNCATED AT 250 WORDS) [less ▲]

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See detailChanges in carcass and meat composition during the finishing of Belgian Blue double-muscled cull cows
Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg; Istasse, Louis ULg et al

in Book of absracts of the 55th Annual Meeting of the European Association for Animal Production (2004)

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See detailChanges in cerebral metabolism in patients with a minimally conscious state responding to zolpidem.
Chatelle, Camille ULg; Thibaut, Aurore ULg; Gosseries, Olivia ULg et al

in Frontiers in Neuroscience (2014)

BACKGROUND: Zolpidem, a short-acting non-benzodiazepine GABA agonist hypnotic, has been shown to induce paradoxical responses in some patients with disorders of consciousness (DOC), leading to recovery of ... [more ▼]

BACKGROUND: Zolpidem, a short-acting non-benzodiazepine GABA agonist hypnotic, has been shown to induce paradoxical responses in some patients with disorders of consciousness (DOC), leading to recovery of arousal and cognitive abilities. We here assessed zolpidem-induced changes in regional brain metabolism in three patients with known zolpidem response in chronic post-anoxic minimally conscious state (MCS). METHODS: [18F]-fluorodeoxyglucose positron emission tomography (FDG-PET) and standardized clinical assessments using the Coma Recovery Scale-Revised were performed after administration of 10 mg zolpidem or placebo in a randomized double blind 2-day protocol. PET data preprocessing and comparison with a healthy age-matched control group were performed using statistical parametric mapping (SPM8). RESULTS: Behaviorally, all patients recovered functional communication after administration of zolpidem (i.e., emergence from the MCS). FDG-PET showed increased metabolism in dorsolateral prefrontal and mesiofrontal cortices after zolpidem but not after placebo administration. CONCLUSION: Our data show a metabolic activation of prefrontal areas, corroborating the proposed mesocircuit hypothesis to explain the paradoxical effect of zolpidem observed in some patients with DOC. It also suggests the key role of the prefrontal cortices in the recovery of functional communication and object use in hypoxic patients with chronic MCS. [less ▲]

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See detailChanges in cerebrospinal fluid enzyme activity after severe head injury. Diagnostic and prognostic values.
Hans, Pol ULg; Born, J. D.; Chapelle, Jean-Paul ULg et al

in Acta Anaesthesiologica Belgica (1984), 35(1), 79-86

We studied CSF CK and LDH isoenzyme activities in 27 patients with severe head injury and in 10 patients with chronic hydrocephalus not related to trauma. CSF enzymes showed an increased activity ... [more ▼]

We studied CSF CK and LDH isoenzyme activities in 27 patients with severe head injury and in 10 patients with chronic hydrocephalus not related to trauma. CSF enzymes showed an increased activity immediately after trauma, contrasting with the low values measured in the patients with hydrocephalus. In severe head injury, we found a correlation between enzyme release and brain dysfunction assessed according to two methods: the Glasgow coma scale (GCS), and the Liege coma scale (LCS) which uses elements of the GCS and the study of 5 brain stem reflexes. The correlation between enzyme activity and the Liege coma scores is better than that observed with the Glasgow coma scores. High enzyme activity is associated with a bad outcome at six months. It has a prognostic value on so far as it reflects the severity of traumatic structural brain damage. [less ▲]

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See detailChanges in chitin and glycoconjugates during prrecdysial degradation of the old cuticle of Carcinus maenas (Crustacea, Decapoda) as revealed by lectin probes
Compère, Philippe ULg; Bouchtia, Hicham; Goffinet, Gerhard ULg

in Domard, Alain; Roberts, Georges; Varum, Kjell (Eds.) Advances in chitin sciences, volume II (1997)

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See detailChanges in crop yields, soil organic carbon and soil nitrogen content under climate change and variable management practices"
Dumont, Benjamin ULg; Basso, Bruno; Shcherbak, Iurii et al

Conference (2016, September)

Detailed reference viewed: 33 (3 ULg)