Contrôler et réguler une approche interactive

in Education et Recherche (1981)

Nouvelle recherche de periodes d'etoiles Ap observees a l'ESO-VI

in Information Bulletin on Variable Stars (1981), 2004

Not Available

Les alcaloides quaternaires majoritaires du Strychnos variabilis du Zaire

in Planta Medica (1981), 42(8), 371-4

Two quaternary alkaloids have been isolated from the root barks of STRYCHNOS VARIABILIS collected in Zaire. The structure of these alkaloids (mavacurine and fluorocurine) could be deduced from spectral ... [more ▼]

Two quaternary alkaloids have been isolated from the root barks of STRYCHNOS VARIABILIS collected in Zaire. The structure of these alkaloids (mavacurine and fluorocurine) could be deduced from spectral data: UV, MS, IR and (1)H NMR. Moreover, the stereochemistry could be assigned by (1)H NMR at 360 MHz. [less ▲]

The effect of particle precipitation events on the neutral and ion chemistry of the middle atmosphere. I - Odd nitrogen

in Planetary and Space Science (1981), 29

Not Available

The altitude distribution of the Venus ultraviolet nightglow and implications on vertical transport

in Geophysical Research Letters (1981), 8

The altitude distribution of the nitric oxide nightglow was measured with an ultraviolet spectrometer on board Pioneer Venus, in order to study the effects of the distribution on the Venus nightside lower ... [more ▼]

The altitude distribution of the nitric oxide nightglow was measured with an ultraviolet spectrometer on board Pioneer Venus, in order to study the effects of the distribution on the Venus nightside lower thermosphere transport properties. Limb profiles were obtained with an 8 ms integration period on several orbits near periapsis. The observations were made between P minus 2 min and P plus 4 min, where altitude ranges between 150 and 350 km, and latitude varies from 24 degrees N to 9 degrees S. A method independent of the spacecraft attitude data was used to fit the observed limb profiles, and to find the altitude of the maximum of the layer (115 plus or minus 2 km), and the topside scale height (about 3 km). It is shown that downward transport by diffusion alone is not sufficient, and if vertical motion is parameterized by eddy diffusion, an eddy diffusion coefficient is deduced from the altitude of the layer. [less ▲]

A23187 Ionophore—ca2+ interfacial complex: a monolayer approach

in Journal of Colloid & Interface Science (1981), 81(1), 158-168

This paper presents a new approach to study A23187 ionophore in an aqueous environment. The ionophore was spread at the air—water interface. Surface pressure and tritium—hydrogen surface exchange ... [more ▼]

This paper presents a new approach to study A23187 ionophore in an aqueous environment. The ionophore was spread at the air—water interface. Surface pressure and tritium—hydrogen surface exchange measurements demonstrated the conformational stability of A23187 in the free and complexed forms at the interface. Exchange measurements suggested that the A23187 ionophore adopts an interfacial conformation in which hydrogen bonds are not accessible to the aqueous solvent. Surface potential measurements allowed the calculation of the intrinsic dissociation constant of the ionophore carboxylic group in an aqueous environment (pKi = 5). The ionophore activity sequence for bivalent ions was Ca2+>Mg2+⇓Ba2+ This sequence is comparable to those obtained by other authors inorganic solution. Surface radioactivity measurements performed with 45Ca2+ in the subphase demonstrated the formation of a neutral complex between two negatively charged ionophore molecules and one Ca2+ ion. This reaction was only observed at pH higher than 5. The association constant of the interfacial ionophore-Ca2+ complex was calculated. [less ▲]

Liege Symposium No.23

in Information Bulletin on Variable Stars (1981), 1947

Not Available

Comparison of levels of cytosol estrogen receptors with “arterial” and “venous” concentrations of gonadic steroids in mammary tumors

in Clinica Chimica Acta (1981), 112(1), 21-32

Competition between benzo[a]pyrene and various steroids for cytochrome P-450-dependent rat liver monooxygenases.

in Chemico-Biological Interactions (1981), 34

Cytochrome P-450-dependent monooxygenases are able to oxidize a large variety of endogenous and exogenous substrates. This paper describes the in vitro interaction between benzopyrene and steroids at the ... [more ▼]

Cytochrome P-450-dependent monooxygenases are able to oxidize a large variety of endogenous and exogenous substrates. This paper describes the in vitro interaction between benzopyrene and steroids at the level of two rat liver monooxygenases: steroid-16 alpha-hydroxylase and aryl hydrocarbon hydroxylase (AHH). The results obtained suggest the following conclusions: (1) Steroid-16 alpha-hydroxylase is partially supported by a specific cytochrome P-450 form which is not inhibited in vitro by exogenous substrates. Steroid-16 alpha-hydroxylase is completely independent from cytochrome P1-450 (or P-448), as it is insensitive, in vitro, to alpha-naphthoflavone; (2) AHH is supported by two cytochrome P-450 forms: a specific form which is inducible by methylcholanthrene and inhibited in vitro by alpha-naphthoflavone, but is insensitive to metyrapone and steroids; and another less specific form which is inhibited by metyrapone and steroids in vitro. [less ▲]

Isolement d'un Nouvel Alcaloide (O-Acetylretuline) et d'un Triterpenoide (Friedeline) à partir du Strychnos henningsii du Zaire

in Planta Medica (1981), 41(3), 240-3

A new alkaloid (O-acetylretuline) has been isolated from barks and leaves of two samples of STRYCHNOS HENNINGSII collected in Zaire. A triterpenoid (friedelin) is also present in this African species of ... [more ▼]

A new alkaloid (O-acetylretuline) has been isolated from barks and leaves of two samples of STRYCHNOS HENNINGSII collected in Zaire. A triterpenoid (friedelin) is also present in this African species of Strychnos. [less ▲]

Polycaprolactone-based block copolymers. I - Synthesis by anionic-coordination type catalysts

in Macromolecules (1981), 14(2), 242-246

Bimetallic µ-oxalok oxides are very active anionic coordination type catalysts in the living polymerization of t-caprolactone. These compounds have a well-defined composition which can be systematically ... [more ▼]

Bimetallic µ-oxalok oxides are very active anionic coordination type catalysts in the living polymerization of t-caprolactone. These compounds have a well-defined composition which can be systematically modified. It is proposed that at least half the alkoxy groups of these catalysts are replaced by carboxylate ones and the remaining alkoxy groups by any hydroxyl-terminated polymer PX. These new polymer PX-supported catalysts are powerful tools in tailoring poly(ε-capro1actone) block copolymers with well controlled molecular parameters. [less ▲]

Effects of Arbitrary Focal Spot Intensity Distribution, Detector Width, and Scanning Eccentricity in X-ray Computed Tomography

in IEEE Transactions on Acoustics, Speech, and Signal Processing (1981), ASSEP-29(1), 98-106

Hormonal control of the gonadal regression and recovery observed in short days in male and female doves.

in Journal of Endocrinology (1981), 89(1), 79-89

Sexually mature ring doves (Streptopelia risoria) maintained from hatch on a photoperiod of 14 h light : 10 h darkness (14L : 10D) and kept in isolation were transferred to 8L : 16D. This treatment ... [more ▼]

Sexually mature ring doves (Streptopelia risoria) maintained from hatch on a photoperiod of 14 h light : 10 h darkness (14L : 10D) and kept in isolation were transferred to 8L : 16D. This treatment resulted in a partial regression of the ovaries and testes and a fall in the concentration of plasma LH but not of plasma FSH. After 2--3 months exposure to 8L : 16D, the gonads regrew to their original size: this regrowth was accompanied by a parallel increase in the concentration of plasma LH. The responsiveness of the pituitary gland to LH releasing hormone in both sexes after 5 weeks of exposure to 8L : 16D (when the gonads were partially regressed) was similar to the response observed after 15 weeks exposure to this lighting schedule (when the gonads had regrown). It was concluded that the spontaneous recovery of gonadal size in ring doves exposed to 8L : 16D is controlled by the hypothalamus and does not involve changes in the functional capacity of the pituitary gland or of the gonads. [less ▲]

Measuring dynamic liquid holdup in trickle-bed reactors under actual operating conditions

in Chemical Engineering Communications (1981), 8

Theoretical conformational analysis of phospholipids bilayers.

in Biochemical and Biophysical Research Communications (1981), 103(1), 301-10

Dosage de l'hormone placentaire somatotrope et mammotrope bovine par liaison radio-compétitive aux récepteurs membranaires

in Annales de Médecine Vétérinaire (1981), 125

Bovine placental somatomammotropin was labelled with I125 using the lactoperoxidase method. This allowed the development of radioreceptor assays using hepatic and mammary tissues of pregnant rabbits ... [more ▼]

Bovine placental somatomammotropin was labelled with I125 using the lactoperoxidase method. This allowed the development of radioreceptor assays using hepatic and mammary tissues of pregnant rabbits. These assays were used to compare binding properties to hepatic and mammary receptors of highly purified Bovine Placental Somatomammotropin and the native hormone present in cotyledons. Normal levels of this hormone in foetal and maternal cotyledons were also determined using these assays. [less ▲]

The penicillin-binding site in the exocellular DD-carboxypeptidase-transpeptidase of Actinomadura R39

in Biochemical Journal (1981), 193

Heat denaturation and Pronase degradation of the complex previously formed between benzylpenicillin and the exocellular DD-carboxypeptidase-transpeptidase of Actinomadura R39 yields a heptapeptide H-Leu ... [more ▼]

Heat denaturation and Pronase degradation of the complex previously formed between benzylpenicillin and the exocellular DD-carboxypeptidase-transpeptidase of Actinomadura R39 yields a heptapeptide H-Leu-Pro-Ala-Ser-Asn-Gly-Val-OH, where the benzylpenicilloyl group is ester-linked to the serine residue. This linkage is very labile and its hydrolysis causes the release of benzylpenicilloate. In contrast, the native benzylpenicilloyl-enzyme complex is very stable (half-life 70h at 370C) and its breakdown proceeds via fragmentation of the bound benzylpenicilloyl group [Fuad, Frere, Ghuysen, Duez & Iwatsubo (1976) Biochem. J. 155, 623-6291. [less ▲]

Cardiovascular effects of intravenous tolmesoxide in hypertensive patients.

in Archives Internationales de Pharmacodynamie et de Thérapie (1981), 251(2), 322-34

Tolmesoxide, a potent vasodilating compound, was infused intravenously (0.5 to 3.5 mg/kg b.w., rate of infusion: 2.5 to 10.0 mg/min during 7--25 min, 2 or 3 successive infusions separated by a 30 min rest ... [more ▼]

Tolmesoxide, a potent vasodilating compound, was infused intravenously (0.5 to 3.5 mg/kg b.w., rate of infusion: 2.5 to 10.0 mg/min during 7--25 min, 2 or 3 successive infusions separated by a 30 min rest period) in 7 hypertensive patients. An abrupt fall in blood pressure and heart rate occurred in 4 patients whereas 2 patients exhibited almost no hemodynamic response. The remaining case suffering from renovascular hypertension responded with a progressive dose-dependent decrease in blood pressure. No obvious correlation could be demonstrated between the drug plasma levels (ranging between 1.0 and 11.1 microgram/ml) and the hemodynamic effects among the 7 patients studied. [less ▲]

The Reflection Nebula Surrounding HD87643

in Astronomy and Astrophysics (1981), 93

Direct plates in narrow bands (H , [0 NI], [S Ii]) and in the broad (B)-band show that the nebula surrounding the nova- like object HD 87643 is of reflective origin. Furthermore, a spectrogram of the ... [more ▼]

Direct plates in narrow bands (H , [0 NI], [S Ii]) and in the broad (B)-band show that the nebula surrounding the nova- like object HD 87643 is of reflective origin. Furthermore, a spectrogram of the filamentary condensation lying east-west at 17" north of HD 87643 reveals strong Balmer emission lines, with a P Cygni structure at H fl H e, as well as many diffuse emission lines of Fe II: such features essentially form a replica of the spectrum of the central object. These results and other arguments strongly support the idea that the reflection nebula surrounding HD 87643 is associated with the mass-outflow observed from the central hot star. Key words: reflection nebula - HD 87643 - mass-loss [less ▲]

Isolement par DCCC (Droplet Counter Current Chromatography) de la fluorocurarine à partir du Strychnos usambarensis du Rwanda

in Journal de Pharmacie de Belgique (1981), 36(4), 243-248

Fluorocurarine is isolated from the root barks of Strychnos usambarensis by Droplet Counter Current Chromatography (DCCC), a new technique of liquid/liquid chromatography. This quaternary alkaloid ... [more ▼]

Fluorocurarine is isolated from the root barks of Strychnos usambarensis by Droplet Counter Current Chromatography (DCCC), a new technique of liquid/liquid chromatography. This quaternary alkaloid (previously identified in curare and South-Amercican Strychnos) is found for the first time in an African Strychnos. MS, CD, 1H and 13C NMR data are also provided. [less ▲]

Bilinguisme et scolarité: une enquête sociolinguistique sur les enfants espagnols des écoles primaires liégeoises

in Psychologica Belgica (1981), 21

Electrical activity of the bovine uterus prior to and post parturition.

in Veterinary Research Communications (1981), 5(2), 143-50

Recordings of electrical activity of six different areas of the uterus were obtained from two pregnant cows before and after delivery of their calves. Periods of activity occurred as spike bursts of ... [more ▼]

Recordings of electrical activity of six different areas of the uterus were obtained from two pregnant cows before and after delivery of their calves. Periods of activity occurred as spike bursts of potentials which occupied 52% of the recording time before delivery and 92% at the expulsive phase. The mean duration of the bursts was nearly doubled in the last ten hours prior to parturition without changes in their frequency. After delivery, the activity of the uterus occupied 29% of the recording time and consisted of long-lasting periods of spike bursts whose frequency was nearly halved. The alternation of periods of activity and quiescence represents the basic motility pattern of the pregnant uterus. Periods of quiescence are shortened at the time of expulsion and become predominant in the empty uterus, a phenomenon paralleled by changes in the temporal organisation of the number of spike bursts with the periods of activity. [less ▲]

Enquête sérologique sur la stomatite papuleuse bovine

in Annales de Médecine Vétérinaire (1981), 125

A serosurvey was made in Belgium to determine the incidence of antibodies against S.P.B. virus, in bovine sera, by immunodiffusion. The sera were taken from calves, adult bovines or extracted from ... [more ▼]

A serosurvey was made in Belgium to determine the incidence of antibodies against S.P.B. virus, in bovine sera, by immunodiffusion. The sera were taken from calves, adult bovines or extracted from colostrums. Positive results were obtained (52,7 °/o) with adult bovine sera (1 year or more), whatever the animal provenance. But, among the sera extracted from bovine colostrums, the incidence of specific antibodies was much higher (87,3 °/o). In an experimental farm (centre for bovine selection, Ciney), the number of positive sera, null at 2-3 months old, became important (42 °/o) later (9-10 months old). [less ▲]

La recherche en éducation

in Socialisme (1981), 28

Nifurzide, a nitrofuran antiinfectious agent: interaction with Escherichia coli cells.

in Antimicrobial Agents and Chemotherapy (1981), 19(3), 477-86

This paper presents a study of the interactions between Escherichia coli cells and nifurzide, a nitrofuran derivative which is used as an intestinal antiinfectious agent. At low concentrations of ... [more ▼]

This paper presents a study of the interactions between Escherichia coli cells and nifurzide, a nitrofuran derivative which is used as an intestinal antiinfectious agent. At low concentrations of nifurzide, the growth rate of the cultures decreased, and elongated, nonseptate cells appeared. At high concentrations, complete growth inhibition occurred, accompanied by a rather strong bactericidal effect, but the appearance of the cells was normal; in particular, no bacteriolytic effect was observed. A very large number of antibiotic molecules were bound per bacterial cell. After cell disruption, similar amounts of nifurzide were found in the cytoplasm, cytoplasmic membranes, and cell wall, respectively. Most of the bound nifurzide was rapidly degraded or became protein bound. The structure of the outer membrane lipopolysaccharide appeared to have little influence on the activity of nifurzide. [less ▲]

Interactions between non-classical beta-lactam compounds and the beta-lactamases of Actinomadura R39 and Streptomyces albus G

in Biochemical Journal (1981), 199

Streptomyces albus G secretes a Zn2+-containing D-alanyl-D-alanine peptidase. Streptomyces R61 and Actinomadura R39 secrete D-alanyl-D-alanine-cleaving serine peptidases. The effect of non-classical beta ... [more ▼]

Streptomyces albus G secretes a Zn2+-containing D-alanyl-D-alanine peptidase. Streptomyces R61 and Actinomadura R39 secrete D-alanyl-D-alanine-cleaving serine peptidases. The effect of non-classical beta-lactam antibiotics on these three model enzymes has been studied. Mecillinam, cefoxitin, quinacillin, quinacillin sulphone, clavulanate and N-formimidoylthienamycin have no effect on the Zn2+-containing enzyme. 6-Amino-penicillanic acid slowly inactivates this enzyme and 7-aminocephalosporanic acid behaves as a reversible inhibitor. Cefoxitin and N-formimidoylthienamycin are potent anti-bacterial agents; they effectively inactivate the serine R39 enzyme and, to a lesser extent, the serine R61 enzyme. All the other beta-lactam compounds tested, including mecillinam, are slow inactivators of these serine enzymes. The intermediates formed between 6-aminopenicillanic acid and the R61 and R39 enzymes are long- and short-lived respectively, whereas those formed between 7-aminocephalosporanic acid and the same R61 and R39 enzymes are short- and long-lived respectively. Breakdown of the short-lived intermediates thus obtained gives rise to several ninhydrin-positive degradation products. The intermediates formed between clavulanate and the serine enzymes are long-lived. With the R39 enzyme, the inactivated complex formed in a first step undergoes subsequent monomolecular rearrangement to give rise to a second species exhibiting a high absorbance at 273 nm. [less ▲]

Dimensionnement de réservoirs de stockage de G.N.L. à échouer sur le fond de la mer

in Bulletin de l’Association Internationale Permanente des Congrès de Navigation [Bulletin de l'AIPCN] (1981), section II(1), 8

Immunopathological and clinical studies in herpes gestationis.

in British Journal of Obstetrics & Gynaecology (1981), 88(2), 153-9

Herpes gestationis is a recurring pruritic, vesiculobullous disease of pregnancy and puerperium. Recently, Lawley et al (1979) reported a high frequency (38 per cent) of fetal morbidity and mortality in ... [more ▼]

Herpes gestationis is a recurring pruritic, vesiculobullous disease of pregnancy and puerperium. Recently, Lawley et al (1979) reported a high frequency (38 per cent) of fetal morbidity and mortality in 40 cases of immunologically proven herpes gestationis. This study was undertaken to determine whether the antibody to skin basement membrane (found in most patients with herpes gestationis) is able to bind to the placenta basement membranes and thereby to threaten the pregnancy. We were unable to detect this antibody in the placental basement membranes of a patient with herpes gestationis, nor could we demonstrate that the anti-basement membrane antibody, found in the sera of herpes gestationis patients, binds to homologous or autologous placentas and fetal membranes. The importance of an accurate diagnosis and appropriate treatment of this condition is discussed. [less ▲]

Localisation of the phosphoester bond hydrolyzed by the major apurinic/apyrimidinic endodeoxyribonuclease from rat-liver chromatin.

in European Journal of Biochemistry (1981), 118

Interações entre professores e alunos em atividades esportivas selecionadas: o aluno como ponto de partida

in ArtUS (1981), 9/11

In physical education, many studies of the teaching process started by analysing verbal interactions between teacher and students. Observationsal systems used in classroom were applied as such in physical ... [more ▼]

In physical education, many studies of the teaching process started by analysing verbal interactions between teacher and students. Observationsal systems used in classroom were applied as such in physical education setting or were modified to better suit the specific aspects of the subject matter. The image provided by interaction analysis is supposed to reflect the climate of the class. ... [less ▲]

La differenciation des proteines sarcoplasmiques de deux espèces de poissons dépourvues d'hémoglobine, Champsocephalus gunnari et Channichthys rhinoceratus et d'une espèce de formule sanguine normale, Notothenia magellanica

in Cybium (1981), 5

Hypertension and the arterial wall

in Bulletin et Mémoires de l'Académie Royale de Médecine de Belgique (1981), 136(4), 237-53

Miospores in Middle-Upper Frasnian to Famennian sediments partly dated by Conodonts (Boulonnais, France),

in Review of Palaeobotany and Palynology (1981), 34

Estructura y regulation de los genes de la familia de la prolactina

in Archivos de Biologia y Medicina Experimentales (1981), (14), 21

Evaluation patrimoniale des droits à la pension en Belgique

in Cahiers Economiques de Bruxelles (1981), (89), 25-52

Analyse de la localisation des garages et des sociétés de transport dans la région liégeoise

in Wallonie 81 (1981), (3-4), 269-290

Based on a survey of all firms employing 10 workers, the study attempts to identify the characteristics of locations and expectations for future developments

Betamethasone and the rhesus fetus: effect on lung morphometry and connective tissue.

in Pediatric Research (1981), 15(3), 235-40

Pregnant rhesus monkeys (Macaca mulatta) at 67 to 85% of term pregnancy were treated with betamethasone for 3 days and then delivered by cesarean section. These treated fetuses had larger lung volumes (32 ... [more ▼]

Pregnant rhesus monkeys (Macaca mulatta) at 67 to 85% of term pregnancy were treated with betamethasone for 3 days and then delivered by cesarean section. These treated fetuses had larger lung volumes (32.6 +/- 1.8 ml/kg of body weight) compared to gestational age-matched controls (22.9 +/- 3.2 ml/kg of body weight; P less than 0.025) but no alterations in surfactant properties as measured by amniotic fluid L/S ratios, alveolar deflation stability, or lung phosphatidylcholine. These findings suggest that betamethasone effects an increase in fetal lung volume by some method other than alteration in alveolar surfactant concentrations. Results also demonstrated an 11% increase in the collagen to elastin concentration in the treated fetuses as compared to the control animals (P less than 0.01), suggesting alterations in lung connective tissue. Morphometric studies done on the air-fixed inflated lung demonstrated a decrease in the number of alveoli per unit volume of lung among the treated animals (0.95 +/- 0.07 x 10(6)) compared to the control animals (1.19 +/- 0.08 x 10(6); P less than 0.025) and a reduction in the mean surface area of the lungs of the treated animals (506 +/- 10 cm2 per cm3) compared to the control animals (561 +/- 9 cm2 per cm3; P less than 0.005). These findings suggest that at least part of the increased maximal lung volumes is related to increased alveolar distensibility. Together, these pressure volume findings, biochemical studies, and morphometric analyses indicate that a major effect of betamethasone on the rhesus fetal lung is to alter lung connective tissue characteristics. Alterations in lung surfactant appear to be of less functional significance in this rhesus fetal model. The disparity between these findings and other animal studies might be due to differences in species, the preparation, or the method of glucocorticoid administration [less ▲]

Structure and behavior of rat primary and secondary Schwann cells in vitro

in Experimental Cell Research (1981), 131(2), 283-297

The structure and motility of isolated rat primary (I) Schwann cells (SC) have been compared to that of subcultured (II) SC during and after mitotic stimulation. I SC contain myelin components which ... [more ▼]

The structure and motility of isolated rat primary (I) Schwann cells (SC) have been compared to that of subcultured (II) SC during and after mitotic stimulation. I SC contain myelin components which persist for 2 weeks in serum-free medium while they rapidly disappear in medium containing serum and high glucose concentration. These components were never detected in II SC. Both I SC and II SC after their mitotic phase are spindle-shaped, contain many intermediate and actin filaments, have no basement membrane but show intense migratory and undulatory activities. Rare fibroblasts in I cultures are recognized by their extremely variable shape, the presence of Thy 1.1 antigen in their membrane and their intense edge ruffling alternating with abrupt translocation. In contrast, I SC movements consist of intracellular translocation of nuclei along SC processes, which retract and extend constantly, and in slow rhythmic undulation episodes (2.3 ± 0.2/min) alternating with migration at 135 ± 50 μ/h. The total number of these episodes per day in serum-free medium is rigorously identical for different cells (166.3 ± 0.2) and this uniformity of frequency suggests a genotypic basis. Cycles, consisting of an undulation episode followed by a resting interval, have mean durations of 8.6 ± 4.1 min and a sharp peak of occurrence at 6 min, with exponential distribution of the longer periods. Motility of II SC is considerably inhibited during mitotic stimulation by cholera toxin and a pituitary extract while SC phenotype has changed to a flat multipolar cell with prominent Golgi and ribosomes. Migration is reduced to 24 ± 2 μ/h and only 2% of the SC show pulsations of the same periodicity as the I SC undulations. A dramatic increase in pulsation frequency occurs 6–12 h after removal of mitogenic factors when 80% of II SC start pulsating twice as fast for 2–3 days. When mitoses cease, SC quickly recover their SC phenotype with rhythmic undulations while migration speed increased to 92 ± 20 μ/h. Thus, in spite of dramatic modification of shape, structure and behavior during mitotic stimulation, SC subsequently recover their unique motility pattern which might be essential for their myelinating function [less ▲]

Stepwise probit discrimination with specific application to short-term prognosis in acute myocardial infarction.

in Computers and Biomedical Research, an International Journal (1981), 14(5), 391-8

Approche de la dynamique des populations du Mysidacé Leptomysis lingvura (Sars) dans la baie de Calvi

in Bulletin de la Société Royale des Sciences de Liège (1981), 50

L'oestrus : manifestations comportementales et méthodes de détection

in Annales de Médecine Vétérinaire (1981), 125

Méthode d'évaluation des efforts et des pressions exercées par une houle déferlante sur une digue verticale

in Bulletin de l’Association Internationale Permanente des Congrès de Navigation [Bulletin de l'AIPCN] (1981), (40), 12

Collagen heterogeneity in normal human bone marrow

in British Journal of Haematology (1981), 48(2), 287-91

Paraffin embedded sections of formalin fixed, decalcified, normal, human, vertebral bone were stained immunohistochemically for collagen types I, III and IV using the peroxidase--anti-peroxidase (PAP ... [more ▼]

Paraffin embedded sections of formalin fixed, decalcified, normal, human, vertebral bone were stained immunohistochemically for collagen types I, III and IV using the peroxidase--anti-peroxidase (PAP) technique. Preparations stained for collagen types I and III were virtually identical in appearance. These substrates were localized to the cytoplasm and fibrillar processes of a population of cells which were sparsely distributed within the haemopoietic compartment of the bone marrow, being particularly prominent in relation to the marrow sinusoids and fat spaces. They would thus appear to parallel the known distributions of reticulum cells, although their morphology differed in some respects from classical descriptions of the latter cell type. Type IV collagen was found in association with the endothelial lining of the sinusoids. Other connective tissue elements (bone, periosteum, endosteum, blood vessels, etc.) showed characteristic collagen heterogeneity. These results indicate that collagen is a significant component of the bone marrow connective tissue. [less ▲]

Le Principe Anthropique en Cosmologie

in Revue des Questions Scientifiques (1981), 152

Specificity of antibodies to heterologous glomerular and tubular basement membranes in various strains of mice with different H-2 types.

in Clinical & Experimental Immunology (1981), 46(1), 35-43

C3H, CBA (H-2k) and NZB (H-2d) mice were immunized with dog insoluble glomerular (GBM) or tubular basement membrane (TBM). The titre of circulating antibodies was sequentially determined and their ... [more ▼]

C3H, CBA (H-2k) and NZB (H-2d) mice were immunized with dog insoluble glomerular (GBM) or tubular basement membrane (TBM). The titre of circulating antibodies was sequentially determined and their specificity was analysed using various soluble antigenic fractions. Glomerular and tubular deposits were studied on serial biopsies by direct immunofluorescence. After elution from whole kidneys, IgG fixation on normal mouse kidney sections was analysed by indirect immunofluorescence. After immunization with insoluble GBM, animals from all three strains develop antibodies mainly directed against collagenous antigenic determinants shared by GBM and TBM. After immunization with insoluble TBM, the antibodies are directed in NZB mice against non-collagenous TBM-specific determinants, in C3H mice against collagenous determinants and in CBA mice against both types of antigenic determinants. Thus the ability to respond to the various antigens of GBM and TBM is genetically determined and does not depend only on the major histocompatibility complex. [less ▲]

C.P.A.S. et protection de la jeunesse: Une expérience

in Revue d'Action Sociale (1981), 3

Saint Lambert. Martyr et saint Liégeois

in Archeologia : Fouilles et Découvertes (1981)

Interruption médicamenteuse pré-anesthésique: état actuel de la question

in Revue Médicale de Liège (1981), XXXVI(5), 185-193

Influence de différentes randomisations restreintes sur l'analyse des résultats d'expériences agronomiques - applications

in Biométrie-Praximétrie (1981), 21(3-4), 71-90

relations entre les facteurs maternels, sociaux et les grossesses et accouchements à risques.

in Louvain Medical (1981), 100