La problématique du réseau écologique : Bases théoriques et perspectives d’une stratégie écologique d’occupation et de gestion de l’espace
in Colloque international Le Réseau écologique (1997)Detailed reference viewed: 48 (19 ULg)
Plasma bovine pregnancy-associated glycoprotein concentrations throughout gestation in relationship fetal number in the cow
; Sulon, Joseph ; Beckers, Jean-François et al
in European Journal of Endocrinology (1997), 137
This study characterized the peripheral plasma bovine pregnancy-associated glycoprotein (bPAG) profile throughout gestation and examined the effect of stage of gestation and fetal number on this profile ... [more ▼]
This study characterized the peripheral plasma bovine pregnancy-associated glycoprotein (bPAG) profile throughout gestation and examined the effect of stage of gestation and fetal number on this profile in Holstein cows after non-surgical embryo transfer. Cows (n = 12) were divided into three groups: group 1 = normal singleton pregnancies (n = 5); group 2 = normal twin pregnancies (n = 5); group 3 = abnormal twin pregnancies (n = 2). Blood was collected about every third day from day 0 (defined as the first day of standing estrus), then daily for the last 10 days of gestation, and sampling was stopped one day postpartum. The time-related changes in plasma bPAG concentrations were significantly (P < 0.01) affected by the stage of gestation and fetal number (P < 0.01), except during the last 10 days of gestation. In both normal pregnancy groups, bPAG concentration increased rapidly during the first trimester (0.5 +/- 0.1 to 14.6 +/- 1.7 ng/ml and 1.0 +/- 0.6 to 21.8 +/- 4.8 ng/ml, in singleton and twin-bearing groups respectively), then progressively between days 160 and 20 prepartum (31.6 +/- 6.2 to 114.3 +/- 31.3 ng/ml and 41.6 +/- 7.4 to 155.8 +/- 36.6 ng/ml in singleton and twin-bearing cows respectively). The mean concentration between days 20 and 10 prepartum approximately tripled (P < 0.001) in both these groups of cows (114.3 +/- 31.1 to 493.0 +/- 75.3 ng/ml and 155.8 +/- 36.6 to 409.3 +/- 114.7 ng/ml in singleton and twin-bearing cows respectively), but between days 10 prepartum and parturition the values increased about threefold (P < 0.01) in the singleton group (493.0 +/- 75.3 to 1352.8 +/- 286.5 ng/ml) and fivefold (P < 0.001) in the twin-bearing group (409.3 +/- 114.7 to 2154.0 +/- 505.7 ng/ml). The two cows in group 3 that gave birth prematurely to a stillborn calf or to a schistosomus reflexus calf exhibited an aberrant bPAG profile. Our results indicate that peripheral bPAG concentrations are correlated to the stage of gestation and fetal number, and that the profile of the peripheral plasma concentrations provides a useful indication of the feto-placental status. [less ▲]Detailed reference viewed: 28 (3 ULg)
Rayonnement différentiel, spécialisation et vitalité commerciale : réflexions sur les pôles périphériques traditionnels des agglomérations belges à partir de lʼexemple de Jemeppe-sur-Meuse
in Revue Belge de Géographie (1997), (1-2-3-4), 139-148Detailed reference viewed: 29 (6 ULg)
Inception of Taeniate Bisaccates pollen: further evidence and age implications for the Monte Alegre Formation (Pennsylvanian, Amazon Basin).
; ; et al
in Annals Academia Brazil Cienca (1997)Detailed reference viewed: 13 (0 ULg)
The dynamics of the karstic features of Sprimont (Belgium) and its consequences on the land-use planning. Preliminary note.
Ek, Camille ; ; et al
in Proceedings of tne 12th International Congress of Speleology (1997)
The Department of Physical Geography of the University of Liège (Belgium) was in charge of updating the physical factors of the regional land management map for Sprimont, a karstic municipality of Belgium ... [more ▼]
The Department of Physical Geography of the University of Liège (Belgium) was in charge of updating the physical factors of the regional land management map for Sprimont, a karstic municipality of Belgium. The influence of floods, karst processes, landslides, and other physical factors were evaluated. The karst features and karst-related events have been mapped three times with accuracy in this area during the last century (in 1898, 1971 and 1996). The data provided the basis for a study of the rates and dynamics of the karst processes and permitted the forecasting of hazards on a secular basis. A map of karstic areas, karst features and karst dynamics was prepared. Some systematic trends of the evolution of karst features were noted. A map of risks and land-use constraints was derived from the first map and from the observed trends. Rules were induced from these data and were proposed to control building and other activities in clearly defined areas. [less ▲]Detailed reference viewed: 17 (4 ULg)
29. Lessons learned from the thermal design of an instrument (EIT, the Extreme-UV Imaging Telescope) on board SOHO
in IAF (1997)Detailed reference viewed: 33 (5 ULg)
In-orbit diagnostics of EIT EUV CCD radiation-induced aging
Defise, Jean-Marc ; ; et al
in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (1997)Detailed reference viewed: 14 (1 ULg)
First Results from EIT
; ; et al
in 1st Advances in Solar Physics Euroconference. Advances in Physics of Sunspots (1997)
The Extreme-UV Imaging telescope has already produced more than 15000 wide-field images of the corona and transition region, on the disk and up to 1.5R_o above the limb, with a pixel size of 2.6\arcsec ... [more ▼]
The Extreme-UV Imaging telescope has already produced more than 15000 wide-field images of the corona and transition region, on the disk and up to 1.5R_o above the limb, with a pixel size of 2.6\arcsec. By using four different emission lines, it provides the global temperature distribution in the quiet corona, in the range 0.5 to 3*E(6) K. Its excellent sensitivity and wide dynamic range allow unprecedented views of low emission features, even inside coronal holes. Those so-called ``quiet'' regions actually display a wide range of dynamical phenomena, in particular at small spatial scales and at time scales going down to only a few seconds, as revealed by all EIT time sequences of full- or partial-field images. The initial results presented here demonstrate the importance of this wide-field imaging experiment for a good coordination between SOHO and ground-based solar telescopes, as well as for science planning. [less ▲]Detailed reference viewed: 18 (4 ULg)
Autoregulation of endogenous glucose production in man.
; ; Paquot, Nicolas
in Biochemical Society Transactions (1997), 25(1), 11-3Detailed reference viewed: 4 (1 ULg)
Pemphigus foliacé dans l'espèce équine : synthèse et description de 2 cas.
Amory, Hélène ; ; Desmecht, Daniel et al
in Annales de Médecine Vétérinaire (1997), 141Detailed reference viewed: 80 (19 ULg)
Long-wavelength behavior of the exchange-correlation kernel in the Kohn-Sham theory of periodic systems
Ghosez, Philippe ; ;
in Physical Review. B : Condensed Matter (1997), 56(20), 12811-12817
The polarization dependence of the exchange-correlation (re) energy functional of periodic insulators within Kohn-Sham (KS) density-functional theory requires a O(1/q(2)) divergence in the re kernel for ... [more ▼]
The polarization dependence of the exchange-correlation (re) energy functional of periodic insulators within Kohn-Sham (KS) density-functional theory requires a O(1/q(2)) divergence in the re kernel for small vectors q. This behavior, exemplified for a one-dimensional model semiconductor, is also observed when an insulator happens to be described asa KS metal, or vice versa. Although it can occur in the exchange-only kernel, it is not found in the usual local, semilocal, or even nonlocal approximations to KS theory. We also show that the test-charge and. electronic definitions of the macroscopic dielectric constant differ from one another in exact KS theory, but are equivalent in the above-mentioned approximations. [less ▲]Detailed reference viewed: 6 (0 ULg)
Un prince en faillite. Jean de Flandre, évêque de Metz (1279/80-1282), puis de Liège (1282-1291)
Book published by Académie royale de Belgique - Commission royale d'Histoire (1997)Detailed reference viewed: 10 (2 ULg)
Activation of the transcription factor NF-kappaB in lipopolysaccharide-stimulated U937 cells
Legrand-Poels, Sylvie ; ; et al
in Biochemical Pharmacology (1997)Detailed reference viewed: 3 (0 ULg)
Differential expression of c-fos, Hsp70 and Hsp27 after photothrombotic injury in the rat brain.
Plumier, Jean-Christophe ; ; et al
in Molecular Brain Research (1997), 45(2), 239-46
In situ hybridization and immunohistochemistry were used to examine the expression of c-fos, Hsp70 and Hsp27 following photothrombotic injury in the right fronto-parietal cortex of the rat. C-fos mRNA and ... [more ▼]
In situ hybridization and immunohistochemistry were used to examine the expression of c-fos, Hsp70 and Hsp27 following photothrombotic injury in the right fronto-parietal cortex of the rat. C-fos mRNA and protein were detected in the entire cerebral cortex on the lesioned side. Hsp70 mRNA accumulation was observed only adjacent and peripheral to the site of the lesion. At 1 h after photothrombotic injury, Hsp70 expression delineates the area of necrosis at 24 h after photothrombotic injury. Hsp27 protein was observed in the ipsilateral cerebral cortex with the exception of the deep layers of the cingulate cortex. In addition, while c-Fos immunoreactivity was localized in cell nuclei, Hsp27 immunoreactivity was detected in the cytoplasm of astrocytes. These results demonstrate that unilateral cortical injury induces changes in gene expression that vary according to cell type and brain region. [less ▲]Detailed reference viewed: 8 (0 ULg)
Cortical application of potassium chloride induces the low-molecular weight heat shock protein (Hsp27) in astrocytes.
Plumier, Jean-Christophe ; ; et al
in Journal of Cerebral Blood Flow & Metabolism (1997), 17(7), 781-90
Spreading depression induces tolerance to ischemic injury, and ischemic tolerance has been associated with expression of heat shock proteins (Hsp). Here we examine Hsp27 expression after KCl-induced ... [more ▼]
Spreading depression induces tolerance to ischemic injury, and ischemic tolerance has been associated with expression of heat shock proteins (Hsp). Here we examine Hsp27 expression after KCl-induced spreading depression. Twenty-minute cortical KCl application induced Hsp27 immunoreactivity in glial fibrillary acidic protein-positive astrocytes of the ipsilateral neocortex. Systemic administration of MK-801 (3 mg/kg) suppressed KCl-induced Hsp27 expression in the parietal cortex. Astrocytes in the posterior cingulate and retrosplenial cortex did not express Hsp27 after KCl application but did express Hsp27 after systemic administration of high dose MK-801 (9 mg/kg). Whereas Hsp27 was usually observed in all layers of the parietal cortex after 5-minute application of KCl, in 2 of 6 rats, Hsp27 was seen in clusters of astrocytes or in astrocytes in the superficial layers I to III of the parietal cortex. We conclude that (1) cortical application of KCl triggered Hsp27 astrocytic expression; (2) astrocytes in the cingulate and retrosplenial cortex responded differently compared with astrocytes of the parietal cortex; (3) Hsp27 expression progressed from small clusters of astrocytes throughout superficial layers of the cortex that joined and recruited astrocytes in deeper layers; (4) several mechanisms induced Hsp27 astrocytic expression. We propose that Hsp27 is involved in spreading depression-induced ischemic tolerance through protection of astrocyte function. [less ▲]Detailed reference viewed: 20 (4 ULg)
Constitutive expression of the 27-kDa heat shock protein (Hsp27) in sensory and motor neurons of the rat nervous system.
Plumier, Jean-Christophe ; ; et al
in Journal of Comparative Neurology (The) (1997), 384(3), 409-28
In this study, the constitutive expression of the 27-kDa heat shock protein (Hsp27) in the adult rat central nervous system has been examined by immunohistochemistry and by two-dimensional gel Western ... [more ▼]
In this study, the constitutive expression of the 27-kDa heat shock protein (Hsp27) in the adult rat central nervous system has been examined by immunohistochemistry and by two-dimensional gel Western blot analysis. Hsp27 immunoreactivity was observed primarily in motoneurons of cranial nerve nuclei and spinal cord, and in primary sensory neurons and their central processes. Also, Hsp27 immunoreactivity was present in neurons of the arcuate nucleus and of the reticular formation. However, only a subset of these neurons was Hsp27-immunoreactive. Most general somatic efferent motoneurons of the hypoglossal nucleus and spinal motor columns and most special visceral efferent motoneurons of the cranial nerve nuclei were Hsp27-positive. In contrast, fewer general somatic efferent motoneurons for eye muscles were Hsp27-positive, and only a small proportion of general visceral efferent neurons, i.e., parasympathetic and sympathetic preganglionic neurons, were stained for Hsp27. Many pseudounipolar sensory neurons were Hsp27-immunoreactive, and the patterns of staining in central sensory nuclei suggested that specific subpopulations of sensory neurons contained Hsp27. The cellular distribution of Hsp27 was uniform throughout the cytoplasm, including the perikaryon, axon and dendrites, the latter often exhibiting varicosities or beading in distal processes. Western blot analyses revealed that at least three phosphorylated isoforms of Hsp27 were present in the spinal cord. These results suggest that constitutively expressed Hsp27 may be related to functional subpopulations of motoneurons and primary sensory neurons. [less ▲]Detailed reference viewed: 11 (2 ULg)
Transgenic mice expressing the human inducible Hsp70 have hippocampal neurons resistant to ischemic injury.
Plumier, Jean-Christophe ; ; et al
in Cell Stress & Chaperones (1997), 2(3), 162-7
Using transgenic mice constitutively expressing the human inducible Hsp70, we examined the role of Hsp70 on cell survival after focal cerebral ischemia. Twenty-four hours after permanent occlusion of the ... [more ▼]
Using transgenic mice constitutively expressing the human inducible Hsp70, we examined the role of Hsp70 on cell survival after focal cerebral ischemia. Twenty-four hours after permanent occlusion of the middle cerebral artery, no difference in infarct area was detected between Hsp70-transgenic and non-transgenic mice. In the non-transgenic mice, many pyramidal neurons of the ipsilateral hippocampus were observed to be pyknotic. However, in all Hsp70-transgenic mice, hippocampal pyramidal neurons showed normal morphology and no evidence of pyknosis. This suggests that constitutive expression of Hsp70 reduces the extent of damage following permanent middle cerebral artery occlusion. [less ▲]Detailed reference viewed: 12 (0 ULg)