Different treatments of linseed of culled cows and young bulls

in 58th Annual Meeting of the European Association for Animal Production (2007)

Différentes estimations du libre parcours moyen en acoustique des salles : influence sur l’estimation de l’énergie acoustique par un modèle de diffusion

Conference (2006, April)

La plupart des outils de prévision en acoustique des salles sont basés sur le principe du tir de rayons. La précision des résultats dépend alors du nombre de rayons choisi, nécessairement important quand ... [more ▼]

La plupart des outils de prévision en acoustique des salles sont basés sur le principe du tir de rayons. La précision des résultats dépend alors du nombre de rayons choisi, nécessairement important quand la géométrie simulée est grande et/ou disproportionnée, ce qui implique alors des temps de calcul élevés. Pour ce type de géométrie, une méthode alternative, basée sur la résolution numérique d’une équation de diffusion, permet en revanche de réaliser des prévisions acoustiques au prix d’un coût numérique modeste. Ce modèle repose en particulier sur un coefficient de diffusion caractérisant la pièce. Ce coefficient est théoriquement proportionnel au libre parcours moyen (LPM) du local considéré, vérifiant classiquement l’expression 4V/S (V étant le volume de la salle, S la surface des parois). Il est souvent admis que cette valeur est valide pour une salle de dimensions homogènes et dans le cas d’un champ réverbéré diffus. Néanmoins, dans la présente étude nous montrons que pour des locaux particulièrement allongés ou plats, l’atténuation sonore, directement dépendante du coefficient de diffusion, est surestimée par ce modèle. Il en est de même pour des locaux dont la loi de réflexion aux parois s’écarte d’une loi de Lambert. Ainsi, afin d’améliorer les performances du modèle de diffusion, la solution envisagée consiste d’une part, à réaliser un calcul numérique préliminaire du LPM et d’autre part, à considérer les approches analytiques alternatives du LPM rencontrées dans la littérature. La méthode numérique retenue est basée sur le suivi de particules sonores, et permet d’établir le LPM à partir de l’ensemble des distances de collision entre deux parois, pour des conditions de réflexion quelconques. Les résultats de ces approches analytiques et numériques sont présentés en terme d’atténuation sonore pour un local plat et un local allongé, et sont comparés à ceux issus d’autres méthodes numériques. [less ▲]

Les différentes fonctions de la résolution de problèmes sont-elles présentes dans l’enseignement primaire en Communauté française de Belgique ?

in Dorier, J-L.; Coutat, S. (Eds.) Enseignement des mathématiques et contrat social : enjeux et défis pour le 21 e siècle – Actes du colloque EMF2012 (2012)

Les différentes formes de la contraction du myocarde ventriculaire

in Archives Internationales de Physiologie (1929), XXXI

Les differentes voies d'abord de l'oreillette gauche

in Revue Médicale de Liège (2004), 59(9), 504-8

The knowledge of the anatomy of the atria and interatrial septum permits different routes to approach the left atrioventricular valve. The Waterston's or Sondegaard's groove approach is the most ... [more ▼]

The knowledge of the anatomy of the atria and interatrial septum permits different routes to approach the left atrioventricular valve. The Waterston's or Sondegaard's groove approach is the most frequently used, but other approaches such as Dubost'transseptal technique, vertical transseptal approach (Berreklouw-Guiraudon), biatrial inferior transseptal approach (Couetil) or Saksena's approach may be relevant in special situations. It is the purpose of this article to review the anatomic and technical basis of these different approaches and their respective merits. [less ▲]

Differential accumulation of mRNA for immediate early genes and heat shock genes in heart after ischaemic injury.

in Journal of Molecular and Cellular Cardiology (1996), 28(6), 1251-60

Ischaemic injury leads to the expression of heat shock and immediate early genes. Here the localization of this induction is examined by in situ hybridization analysis in serial sections of buffer ... [more ▼]

Ischaemic injury leads to the expression of heat shock and immediate early genes. Here the localization of this induction is examined by in situ hybridization analysis in serial sections of buffer-perfused isolated rat heart after 30 min of coronary artery occlusion. The accumulation of mRNA for hsc70, hsp70, c-fos, c-jun, and Erg-1 was localized coincidently and was restricted to the ischaemic area of the heart. mRNA for these genes was undetectable at the end of the ischaemic period (no reperfusion). After 30 min of reperfusion, accumulation of mRNA for hsc70, hsp70, c-fos, and c-jun was detectable and increased with further reperfusion. Within the area labelled for these gene products was a central area of less intense labelling which corresponded to the necrotic zone. The immediate early gene product, jun-B, was localized in both the ischaemic and the non-ischaemic area of the hearts. These results suggest that the area of the heart where heat shock and immediate early gene transcripts accumulate, while injured, recovers transcriptional activity, and that the central area where minimal heat shock and immediate early gene transcripts accumulate, does not recover transcriptional activity and is irreversibly injured. [less ▲]

Differential c-fos expression in the brain of male Japanese quail following exposure to stimuli that predict or do not predict the arrival of a female

in European Journal of Neuroscience (2007), 25(9), 2835-2846

We investigated the effects of presenting a sexual conditioned stimulus on the expression of c-fos in male Japanese quail. Eight brain sites were selected for analysis based on previous reports of c-fos ... [more ▼]

We investigated the effects of presenting a sexual conditioned stimulus on the expression of c-fos in male Japanese quail. Eight brain sites were selected for analysis based on previous reports of c-fos expression in these areas correlated with sexual behaviour or learning. Males received either paired or explicitly unpaired presentations of an arbitrary stimulus and visual access to a female. Nine conditioning trials were conducted, one per day, for each subject. On the day following the ninth trial, subjects were exposed to the conditional stimulus (CS) for 5 min. Conditioning was confirmed by analysis of rhythmic cloacal sphincter movements (RCSM), an appetitive sexual behaviour, made in response to the CS presentation. Subjects in the paired condition performed significantly more RCSM than subjects in the unpaired group. Brains were collected 90 min following the stimulus exposure and stained by immunolhistochemistry for the FOS protein. Significant group differences in the number of FOS-immunoreactive (FOS-ir) cells were found in two brain regions, the nucleus taeniae of the amygdala (TnA) and the hippocampus (Hp). Subjects in the paired condition had fewer FOS-ir cells in both areas than subjects in the unpaired condition. These data provide additional support to the hypothesis that TnA is implicated in the expression of appetitive sexual behaviours in male quail and corroborate numerous previous reports of the involvement of the hippocampus in conditioning. Further, these data suggest that conditioned and unconditioned sexual stimuli activate different brain regions but have similar behavioural consequences. [less ▲]

Differential diagnosis and prognosis of tension-type headache

in Olesen, J.; Tfelt-Hansen, P.; Welch, K. M. A. (Eds.) The Headaches (1999)

Differential Diagnosis of Alzheimer's Disease with Pet

in Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine (1994), 35(3), 391-8

PET studies have demonstrated bilateral temporo-parietal hypoperfusion and hypometabolism in probable and definite Alzheimer's disease (AD), a pattern that may help differentiate AD from other dementias ... [more ▼]

PET studies have demonstrated bilateral temporo-parietal hypoperfusion and hypometabolism in probable and definite Alzheimer's disease (AD), a pattern that may help differentiate AD from other dementias. METHODS: To evaluate the diagnostic power of cerebral metabolic distribution patterns for "cortical" degenerative dementias, PET scans obtained from 129 patients referred for differential diagnosis of dementia were analyzed visually. RESULTS: Sixty-five patients had a final clinical diagnosis of probable AD. Ninety-seven percent (97%) of those had abnormal metabolic scans and 94% showed a suggestive pattern of bilateral or unilateral temporo-parietal hypometabolism (with or without frontal involvement). Hypometabolism was unilateral in 23% of patients. Five subjects with a neuropathologically proven diagnosis of Alzheimer's disease had a suggestive metabolic pattern. One of those was an early case with frontal hypometabolism exceeding temporo-parietal involvement. Two patients with Alzheimer's-type dementia had isolated bilateral frontal hypometabolism. CONCLUSIONS: This alternative metabolic pattern may correspond to a non-Alzheimer pathology occurring in 10%-20% of patients suffering from clinically probable Alzheimer's disease. Most of the patients with possible but atypical Alzheimer's-type dementia showed isolated bilateral frontal involvement. This metabolic pattern probably corresponds to different diseases, such as Pick's disease, frontal lobe dementia or progressive subcortical gliosis. [less ▲]

Differential diagnosis of bluetongue

in Bluetongue in northern Europe (2008)