Rapport de la mission de coordination scientifique et technique de l'action 'Hydrogéologie de la vallée du Draa' (consolidation du SigmaDraa) (Maroc)
Report (1999)Detailed reference viewed: 11 (2 ULg)
Les travaux dirigés virtuels du cours d'Anthropologie biologique. Biland d'une première utilisation.
; Poncin, Pascal ; et al
Conference (1999)Detailed reference viewed: 7 (0 ULg)
A strategy for a sustainable protection and restoration of endangered-vulnerable riverine fish populations. The barbel (Barbus barbus) case study in Belgium.
Philippart, Jean-Claude ; Poncin, Pascal
Conference (1999)Detailed reference viewed: 12 (4 ULg)
Approche neuropsychologique de l'inhibition : une fonction frontale
; Van der Linden, Martial ; Collette, Fabienne
in Van der Linden, Martial; Le Gall, Didier; Seron, Xavier (Eds.) et al Neuropsychologie des lobes frontaux (1999)Detailed reference viewed: 109 (6 ULg)
Corticomotoneuronal synaptic connections in normal man. An electrophysiological study.
Maertens de Noordhout, Alain
in Brain : A Journal of Neurology (1999), 122
In order to determine the mono- or oligosynaptic character of connections between pyramidal axons and individual spinal motor neurons, we constructed peri-stimulus time histograms (PSTHs) of the firing ... [more ▼]
In order to determine the mono- or oligosynaptic character of connections between pyramidal axons and individual spinal motor neurons, we constructed peri-stimulus time histograms (PSTHs) of the firing probability of voluntarily activated single motor units (SMUs) of various upper and lower limb muscles upon slightly suprathreshold transcranial anodal electrical stimulations of the motor cortex in normal subjects. Weak anodal cortical stimuli are known to activate preferentially fast-conducting pyramidal axons directly, bypassing cell bodies and cortical interneurons. A narrow bin width (0.1 ms) was chosen to measure precisely the duration of the PSTH excitatory peak, which corresponds to the rise time of the underlying compound excitatory post-synaptic potentials (EPSP). A short duration PSTH peak indicates sharp-rising EPSPs, most commonly encountered in the case of monosynaptic connections. In flexor carpi radialis and soleus SMUs, the PSTHs of built-in responses to anodal cortical stimuli were compared with those produced by 1A afferent stimulation able to elicit a Hoffmann reflex, which is known to be largely monosynaptic. In all upper and lower limb muscles, excitable SMUs responded to anodal cortical stimuli with a highly synchronized peak of increased firing probability. In flexor carpi radialis and soleus SMUs, the mean duration of this peak was significantly narrower than that evoked by 1A afferent stimulation, indicating that monosynaptic corticomotor neuronal transmission dominates low-threshold motor units, even in proximal arm and leg muscles. In the various muscles studied, and particularly in forearm SMUs, we did not observe broad PSTH peaks against the activation of non-monosynaptic corticomotor neuronal pathways, even with near-threshold stimuli. In some triceps and forearm flexor SMUs, subthreshold anodal pulses caused significant inhibition of their voluntary firing, with a latency consistent with activation of 1A inhibitory interneurons by the descending volleys. Measurements of the maximal number of counts in the excitatory PSTH peak upon anodal cortical stimuli provide comparisons of the strength of monosynaptic inputs to various muscles which seems to be maximal for hand and finger extensor muscles, and also for deltoid. [less ▲]Detailed reference viewed: 19 (3 ULg)
La problématique de la ville et de l'urbanisme dans l'Égypte pharaonique et le cas de la cité d'Akhet-Aton, sur le site d'Amarna
in Art&Fact (1999), 19Detailed reference viewed: 68 (1 ULg)
Le point sur les marqueurs de malignité thyroidienne
Scientific conference (1999)Detailed reference viewed: 8 (0 ULg)
IGF-II in primary human colorectal tumors: peptide level, activated promoters, parental imprinting and gene rearrangement.
Winkler, Rose ; Delacroix, Laurence ; et al
in Hormone & Metabolic Research (1999), 31(2-3), 148-54
IGF-II is a polypeptide growth factor with growth and differentiation promoting activities, involved in human development. We have reported previously IGF-II mRNA and peptide overexpression in primary ... [more ▼]
IGF-II is a polypeptide growth factor with growth and differentiation promoting activities, involved in human development. We have reported previously IGF-II mRNA and peptide overexpression in primary human colon cancers. Here we show that the IGF-II peptide content is increased in six primary colon cancers compared to the corresponding healthy tissues. The IGF-II transcripts in healthy and cancerous colon tissues were identified by Northern blotting and RT-PCR. Promoters P3 and P4 were active in most tissues. Relaxation of parental imprinting was observed in two tumors and one healthy tissue, without any correlation with the IGF-II transcript levels. Rearrangements of the IGF-II gene in two tumors containing very high amounts of IGF-II mRNA are described. Fragments containing the breakpoints were cloned by the vectorette-PCR strategy. In both tumors, the breakpoints occurred in repetitive sequences. In one tumor (T11), the breakpoint was localized 2 kb downstream the end of exon 9. The second tumor (T18) contains two modified alleles. In one rearranged allele the breakpoint is located in exon 9. The exact position of the breakpoint in the second rearranged allele has not been identified. In future experiments, the correlation between the gene rearrangements and IGF-II mRNA overexpression will be studied. [less ▲]Detailed reference viewed: 11 (1 ULg)
Intérêt de l'index de latence terminale dans le diagnostic différentiel des polyneuropathies démyélinisantes
WANG, François-Charles ; CRIELAARD, Jean-Michel
Conference (1999)Detailed reference viewed: 97 (2 ULg)
A reference value for the interior-to-edge ratio of isolated habitats.
Bogaert, Jan ; ;
in Acta Biotheoretica (1999), 47(1), 67-77Detailed reference viewed: 14 (0 ULg)
Les évaluations externes en Communauté française de Belgique : quel sens donner à la mesure ?
in Actes du XIIIe Colloque de l'Adméé Europe, Dijon (1999)Detailed reference viewed: 11 (1 ULg)
On the motion of trapped particles in the vicinity of corotation centers
; ; Jancart, Sylvie
in Ferraz-Mello, S. (Ed.) Impact of Modern Dynamics in Astronomy (1999)
In this presentation we revisit the analytical determination of the corotation solutions of the restricted planar three-body problem under the effects of a Stokes drag. Previous calculations by different ... [more ▼]
In this presentation we revisit the analytical determination of the corotation solutions of the restricted planar three-body problem under the effects of a Stokes drag. Previous calculations by different authors, and using different external dissipative forces, have always shown significant quantitative errors of the models with respect to the numerical values. Up to date no concrete explanation has been obtained for this discrepancy. We show that the origin of these errors lies not only in the modelization of the gravitational forces (i.e. disturbing function) but in the averaging process of the variational equations. A second-order averaging is developed based on a Lie transform method (Kamel, 1969). With it we can calculate new equilibrium solutions with a greatly improved accuracy. In a second part, this same perturbation method is applied to study the periodic orbits (i.e. limit cycles) which describe the motion of the particles around the averaged corotational solutions. We show how analytical approximations of these cycles can be obtained through the inverse transformation of the averaging process itself. In all cases, we present comparisons with numerical simulations of the exact equations. [less ▲]Detailed reference viewed: 17 (0 ULg)
L’apoptose mammaire dans le sein normal et en pathologie
DESREUX, Joëlle ; GOFFIN, Frédéric ; BELIARD, Aude et al
in Références en Gynécologie Obstétrique (1999), 6Detailed reference viewed: 32 (1 ULg)
Mise au point d'un test d'évaluation gestuelle du patient lombalgique
Vanderthommen, Marc ; DEFAWEUX, Michel ; TOMASELLA, Marco et al
in Revue de la Société Belge des Ecoles du Dos (1999)Detailed reference viewed: 251 (6 ULg)
Occulo-pharyngeal muscular distrophy : a case report
GARRAUX, Gaëtan ; WANG, François-Charles ; SADZOT, Bernard et al
Conference (1999)Detailed reference viewed: 21 (0 ULg)