Channel incision, gravel mining and bed-load transport in the Rhone river upstream to Lyon, France (Canal Miribel).

in CATENA (1996)

1. Etat

in Hallet, C.; Ledent, A. (Eds.) Etat de l'Environnement wallon 1995, tome 2 : Agriculture (1996)

The courtship behaviour of two subspecies of the Alpine newt, Triturus a. alpestris and T. a. cyreni (Amphibia, Caudata): an evolutionary perspective

Poster (1996)

T92-0045: Interlaboratory quality control on Tpot measurements

in International Journal of Radiation, Oncology, Biology, Physics (1996), 36(1(supp1)), 384

L'entreprise d'insertion en Wallonie: premières leçons de 7 projets-pilotes

Book published by Fondation Roi Baudouin (1996)

Listening to the brain of the newborn by the Doppler method

Book (1996)

This research project provides the assessement of brain circulation in preterm babies and in term babies having a loss of cerebral blood flow autoregulation, an intracranial haemorrage, aventricular ... [more ▼]

This research project provides the assessement of brain circulation in preterm babies and in term babies having a loss of cerebral blood flow autoregulation, an intracranial haemorrage, aventricular dilatation, a cerebral edema, a patent ductus arteriosus, a surgery. It also provides studies of the effects of various drugs on cerebral blood flow. [less ▲]

Effects of supplementation in Belgian Blue bulls finished at grass: animal performance, carcass and meat characteristic

in Animal Science (1996), 62(3), 653

Cosmological formation of low-mass objects

in Astrophysical Journal (1996), 464(2), 523-538

We investigate the early formation of bound objects with masses comparable to the cosmological Jeans mass (similar to 10(5) M.). We follow the growth of isolated spherically symmetric density peaks ... [more ▼]

We investigate the early formation of bound objects with masses comparable to the cosmological Jeans mass (similar to 10(5) M.). We follow the growth of isolated spherically symmetric density peaks starting from the linear perturbative regime. The initial parameters correspond to density peaks of various widths and heights in a cold dark matter cosmology. We use a one-dimensional spherical Lagrangian hydrodynamics code to follow the dynamical, thermal, and nonequilibrium chemical evolution of the gas. The system includes a collisionless dark matter component and a baryonic component composed of the nine species H, H-, H+, He, He+, He++, H-2, H-2(+), and e(-). All relevant chemical reactions between these species and their cooling mechanisms are included in the calculations. We explore the dependence of the dynamical evolution of the gas on two parameters: the initial mass scale and the initial overdensity of the system. We follow the evolution of the density, temperature, and abundance profiles within the cloud, assuming two types of central boundary conditions for the collisionless component: in one the infalling dark matter virializes through a reflection from a hard sphere, while in the other it accretes onto a central sink. We find that in both cases, radiative cooling by H-2 affects the collapse dynamics of the gas only after it has already virialized and become part of the bound object. Therefore, radiative cooling is unlikely to have triggered the initial collapse of perturbations at redshifts z>10. Nevertheless, baryonic objects with masses well below the linear theory Jeans mass (less than or similar to 10(3) M.) form at high redshifts because of shell crossing by the dark matter. Such objects could be the progenitors of a primordial population of high-mass stars in the intergalactic medium. [less ▲]

Neonatal inhibition of brain estrogen synthesis alters adult neural Fos responses to mating and pheromonal stimulation in the male rat.

in Neuroscience (1996), 74(1), 251-60

Neonatal inhibition of brain estrogen formation in male rats by administration of the aromatase inhibitor, 1,4,6-androstatriene-3,17-dione (ATD), permanently changes aspects of their mating behavior and ... [more ▼]

Neonatal inhibition of brain estrogen formation in male rats by administration of the aromatase inhibitor, 1,4,6-androstatriene-3,17-dione (ATD), permanently changes aspects of their mating behavior and partner preference in adulthood. The medial preoptic area receives chemosensory inputs via a sexually dimorphic vomeronasal projection circuit, which responds to reproductively relevant pheromonal cues. The medial preoptic area also receives genital somatosensory inputs via the midbrain central tegmental field and the medial amygdala. We used Fos immunoreactivity as a marker of neuronal activation to determine whether there is a correspondence between the behavioral profiles of neonatally ATD-treated male rats and their neuronal responses in the medial preoptic area and other brain regions to somatosensory and chemosensory stimuli. Achieving eight intromissions with an estrous female led to a greater neuronal Fos immunoreactivity in the medial preoptic area of neonatally ATD-treated male rats compared with neonatally cholesterol-treated male rats. Exposure for 1.5 h to chemosensory cues derived from soiled bedding of estrous females induced Fos immunoreactivity throughout the vomeronasal pathway (i.e. medial amygdala, bed nucleus of the stria terminalis and medial preoptic area) in both ATD and cholesterol males (Experiment 2a). By contrast, exposure for 1.5 h to chemosensory cues derived from soiled bedding of sexually active males revealed clear differences between ATD and cholesterol males in neuronal Fos immunoreactive (Experiment 2b). At peripheral portions of the vomeronasal pathway (i.e. the accessory olfactory bulb and the medial amygdala), there were no differences in the number of Fos immunoreactivity neurons between ATD and cholesterol males. However, neurons in the more central portions of the vomeronasal pathway (i.e. the bed nucleus of the stria terminalis and the medial preoptic area) showed increased Fos immunoreactivity after exposure to odors from sexually active males in ATD males as opposed to cholesterol males. Females, like ATD males, showed neuronal Fos immunoreactivity at each level of the vomeronasal pathway after being exposed to odors from sexually active males. These results suggest that the responsiveness of neurons in the central portion of the vomeronasal projection circuit to odors from sexually active males, but not estrous females, is sexually differentiated in male rats due to the neonatal action of estrogens. [less ▲]

The holodisc distance transform and its applications in image analysis

in Microscopy, Microanalysis, Microstructures (1996), 7