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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)

Detailed reference viewed: 35 (0 ULg)
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), 8

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)

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See detailChanges in diatom assemblages in an Andean lake in response to a recent volcanic event
Cruces, Fabiola; Urrutia, Roberto; Parra, Oscar et al

in Archiv für Hydrobiologie (2006), 165(1), 23-35

Galletue Lake (38 degrees 41'S; 71 degrees 17'W, IX Region-Chile) is located in an area that is highly influenced by eruptive activity of the Lonquimay and Llaima volcanoes. As a consequence, during the ... [more ▼]

Galletue Lake (38 degrees 41'S; 71 degrees 17'W, IX Region-Chile) is located in an area that is highly influenced by eruptive activity of the Lonquimay and Llaima volcanoes. As a consequence, during the last century tephra was deposited into the lake. Sedimentary diatom assemblages were reconstructed in order to establish the tephra effect on their composition and productivity. This was done by taking a sediment core from Galletue Lake at 40 m depth and sectioning it in 1 cm intervals. The core age was obtained with Pb-210 and Cs-137 activities and the mineral composition of the tephra was determined with mineralogical analyses. Furthermore, sedimentological analyses were performed and total organic matter was determined in the profile. The diatom assemblages were analysed using light and electronic microscopy. The results showed that the diatom stratigraphy can be separated in three zones recognizing the periods before and after tephra input. Aulacoseira granulata decreased during the tephra influx and was replaced by Cyclotella aff. glomerata. When the tephra disappeared from the sedimentary record, A. granulata returned to pre-volcanic event levels. At the same time, Cyclotella aff. glomerata decreased within the assemblages. Asterionella formosa and Urosolenia eriensis increased after the tephra input, with values surpassing earlier ones. These results indicate that, after the tephra input, the lake recovered its previous nutrient levels, which agrees with the organic matter content in the sedimentary matrix. Finally, the results reveal that the volcanic disturbance changed the structure and productivity of diatom assemblages in Galletue Lake. [less ▲]

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See detailChanges in diatom, pollen, and chironomid assemblages in response to a recent volcanic event in Lake Galletue (Chilean Andes)
Urrutia, Roberto; Araneda, Alberto; Cruces, Fabiola et al

in Limnologica (2007), 37(1), 49-62

Several lakes in Chile are near important volcanic areas where eruption impacts can limit the quality of lacustrine sediments for reconstructing past environmental changes. In this study, we report ... [more ▼]

Several lakes in Chile are near important volcanic areas where eruption impacts can limit the quality of lacustrine sediments for reconstructing past environmental changes. In this study, we report changes in diatoms, pollen, and chironomids assemblages after a tephra deposition in Lake Galletue (Chilean Andes). A sediment core obtained from Lake Galletue (40 m water depth) was sliced in I cm intervals and subsamples were taken to analyze each proxy. Pb-210 and 137 Cs activities were measured to obtain the geochronology and mineralogical analyses were performed to determine the mineral composition of the tephra. Diatom species composition and productivity were modified when the lake received the tephra; Aulacoseira granulata decreased and was later replaced by Cyclotella af. glomerata. After the tephra input, Aulacoseira granulata abundance increased to pre-disturbance levels and Cyclotella af. glomerata decreased. These changes seem to suggest a momentary increase in lake nutrient levels after the tephra deposition. Chironomid assemblages also decreased in head capsules just after the tephra deposition, but the most important change was the replacement of Ablabesmyia by Parakiefferiella, probably due to the sedimentological changes produced by the input of coarse tephra grains. Furthermore, unlike other studies, chironomid assemblages in Lake Galletue did not show a decrease drastically in diversity within the tephra layer. The pollen analysis indicated that, prior to the volcanic event, the vegetal community was dominated by Nothofagus sp., Araucaria araucana, and Blechnum sp.-type. After the tephra deposition, the same taxa are dominant, indicating that the volcanic event seems not produce changes in the vegetation. Nevertheless, within the tephra layer it is possible to see an increase in Poaceae, which represent - due to the percolation process - the effect of eruption on the vegetation. According to our results, diatoms were the most sensitive proxy for describing the changes produced by tephra deposition into the aquatic ecosystem and, despite the noticeable changes in its sedimentological properties; the lake seems to have a high resilience capacity, allowing it to return to pre-tephra input conditions. (c) 2006 Elsevier GmbH. All rights reserved. [less ▲]

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See detailChanges in DNA-methylation during zygotic embryogenesis in interspecific hybrids of beans (Phaseolus spp.)
Abid, Ghassen ULg; Muhoviski, Yordan; Jacquemin, Jean-Marie et al

in Plant Cell, Tissue & Organ Culture (2011), (3), 383-393

Hybrid embryos resulting from crosses between Phaseolus species often fail to reach maturity and some combinations frequently abort at early developmental stages. The genetic or molecular basis for these ... [more ▼]

Hybrid embryos resulting from crosses between Phaseolus species often fail to reach maturity and some combinations frequently abort at early developmental stages. The genetic or molecular basis for these consistent developmental defects is at present not clear. However, an extremely complex genetic system, thought to be caused by major epigenetic changes associated with gene expression changes, has been shown to be active in plant species. We have investigated DNA methylation in two interspecific hybrids, Phaseolus vulgaris X Phaseolus coccineus and it reciprocal crosses, using methylation sensitive amplification polymorphism (MSAP). The potential use of MSAP for detecting methylation variation during embryogenesis in interspecific hybrids is discussed. Significant differences in the DNA methylation patterns were observed in abortive (interpecific hybrids) and non abortive (parental) genotypes. Taken together, our results strongly suggest that generalized alterations in DNA methylation profiles could play a causative role in early interspecific embryo abortion in vivo. A considerable change in the methylation pattern during embryogenesis could be involved in the disruption of the regulation or maintenance of the embryogenesis process of Phaseolus interspecific hybrids. The results also support the earlier hypothesis that DNA methylation is critical for the regulation of plant embryogenesis and gene expression. [less ▲]

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See detailChanges in Effective Connectivity by Propofol Sedation
Gomez Jaramillo, Francisco Albeiro ULg; Phillips, Christophe ULg; Soddu, Andrea ULg et al

in PLoS ONE (2013), 8(8), 71370

Mechanisms of propofol-induced loss of consciousness remain poorly understood. Recent fMRI studies have shown decreases in functional connectivity during unconsciousness induced by this anesthetic agent ... [more ▼]

Mechanisms of propofol-induced loss of consciousness remain poorly understood. Recent fMRI studies have shown decreases in functional connectivity during unconsciousness induced by this anesthetic agent. Functional connectivity does not provide information of directional changes in the dynamics observed during unconsciousness. The aim of the present study was to investigate, in healthy humans during an auditory task, the changes in effective connectivity resulting from propofol induced loss of consciousness. We used Dynamic Causal Modeling for fMRI (fMRI-DCM) to assess how causal connectivity is influenced by the anesthetic agent in the auditory system. Our results suggest that the dynamic observed in the auditory system during unconsciousness induced by propofol, can result in a mixture of two effects: a local inhibitory connectivity increase and a decrease in the effective connectivity in sensory cortices. [less ▲]

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