Composition de la graisse de Dacryodes edulis (G. Don) H.J. Lam.

in Revue Française des Corps Gras (1981), 4

Compte tenu de l'abondance du fruit de Dacryodes edulis (Safou) sur le marché indigène camerounas, nous avons cru interessant d'approfondir l'étude de son huile. Nous avons déterminé les proprétés ... [more ▼]

Compte tenu de l'abondance du fruit de Dacryodes edulis (Safou) sur le marché indigène camerounas, nous avons cru interessant d'approfondir l'étude de son huile. Nous avons déterminé les proprétés physiques, séparé les lpides en classes et déterntiné la structure complète des tryglycérides. Les principaux trlglycérides sont OOP (15,9 %), OLP (7,1 %), LOP 7 %). LLP (5,7 %), POP (24.9 %) et PLP (22 %) par minute. [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 ▲]

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

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

in Chemical Engineering Communications (1981), 8

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

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 ▲]

Interruption médicamenteuse pré-anesthésique: état actuel de la question

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

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

in Revue d'Action Sociale (1981), 3

Tables de production de l'épicéa : étude de la répartition des nombres d'arbres et du volume par catégories de circonférences

in Bulletin de la Société Royale Forestière de Belgique = Tijdschrift van de Koninklijke Belgische Bosbouwmaatschappij (1981), 88(2), 67-73

Effect of indomethacin on the metabolic and hormonal response to a standardized breakfast in normal subjects.

in Acta Diabetologica Latina (1981), 18(3), 259-66

We have investigated the influence of a single oral administration of indomethacin on blood glucose, plasma free fatty acids (FFA), alpha-amino-nitrogen, insulin and glucagon concentrations in young ... [more ▼]

We have investigated the influence of a single oral administration of indomethacin on blood glucose, plasma free fatty acids (FFA), alpha-amino-nitrogen, insulin and glucagon concentrations in young healthy subjects. Two groups of 6 subjects were studied, the first received a standardized 500 kcal mixed meal without any previous drug administration (controls) whereas the second group received 50 mg indomethacin 2 h before ingesting an identical meal. Plasma indomethacin concentration reached its maximum (2.36 +/- 0.36 micro g/ml) 15 min after administration and declined to 0.45 +/- 0.04 micro g/ml after 2 h. Indomethacin ingestion was followed by a significant increase in blood glucose and plasma FFA reaching their maximum value at 45 min and returning to basal levels at 120 min. No simultaneous changes in plasma alpha-amino-nitrogen, insulin or glucagon levels were detected during this period. The meal was followed by a rise in blood glucose and plasma insulin as well as by a decrease in plasma FFA concentration. No significant differences were detected between the controls and the subjects receiving indomethacin. In controls, the meal was followed by a rise in plasma alpha-amino-nitrogen and a modest although significant increase in glucagon levels. In indomethacin-treated subjects, the increment of alpha-amino-nitrogen was less marked and the increase in plasma glucagon was not observed. Thus, indomethacin by itself can exert several metabolic effects; however, it does not deteriorate the blood glucose or insulin profile after a regular meal. The present work is the first to demonstrate that an inhibitor of prostaglandin synthesis inhibits the plasma glucagon rise occurring after a physiological stimulus such as a normal meal. On the basis of previous in vitro experiments, we suggest that this effect results from an inhibition of glucagon secretion by the PG synthesis inhibitor. [less ▲]

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

in Louvain Medical (1981), 100

Etude ultrastructurale des effets de la neuraminidase sur des processus palatins de rat.

in Bulletin de l'Association des Anatomistes (1981), 65(190), 329-39

In a previous work, we demonstrated that palatine processes treated with 10 micrograms/ml neuraminidase for 30 minutes at 37 degrees C show a delayed fusion in vitro. In order to investigate the effects ... [more ▼]

In a previous work, we demonstrated that palatine processes treated with 10 micrograms/ml neuraminidase for 30 minutes at 37 degrees C show a delayed fusion in vitro. In order to investigate the effects of neuraminidase, the treated palatine processes were observed with the aid of transmission and scanning electron microscopy. The effect of neuraminidase is exclusively detectable on superficial flat cells of the palatine processes, especially the cells of the medial edge of the process. The epithelial basal cells remain unchanged. Observed with the S.E.M., the superficial epithelial cells show bubbles, become spherical and detached. To explain these observations, we namely propose the following hypothesis: the action of neuraminidase prevents the fusion of the palatine processes because it denudes basal cells bearing a too immature cell coat for ensuring sufficient adherence between the palatine processes. [less ▲]

The prolactin gene is located on chromosome 6 in humans

in Science (1981), 212(4496), 815-6

The gene for prolactin has been located on chromosome 6 in humans. DNA fragments of 4.8 and 4.0 kilobases containing prolactin gene sequences were identified in human genomic DNA, whereas DNA fragments of ... [more ▼]

The gene for prolactin has been located on chromosome 6 in humans. DNA fragments of 4.8 and 4.0 kilobases containing prolactin gene sequences were identified in human genomic DNA, whereas DNA fragments of 7.4, 3.6, and 3.3 kilobases containing prolactin gene sequences were found in mouse cells. In somatic cell hybrids of human and mouse cells the 7.4-, 3.6-, and 3.3-kilobase mouse fragments were always present, whereas the 4.8- and 4.0-kilobase human fragments were only present when human chromosome 6 was also present. We conclude that the prolactin gene resides on chromosome 6, a different location from those of the genes for the related hormones chorionic somatomammotropin and growth hormone. [less ▲]

Comment on “Dirac phenomenology in nuclear structure and reactions”

in Physical Review. C : Nuclear Physics (1981), 24

Comparison of the interactions of a specific neurotoxin (alpha-bungarotoxin) with the acetylcholine receptor in Torpedo californica and Electrophorus electricus membrane preparations.

in Biochemistry (1981), 20(19), 5565-70

alpha-Bungarotoxin, a snake neurotoxin, binds irreversibly and specifically to the acetylcholine receptor isolated from the electroplax of Electrophorus electricus and Torpedo species and has been an ... [more ▼]

alpha-Bungarotoxin, a snake neurotoxin, binds irreversibly and specifically to the acetylcholine receptor isolated from the electroplax of Electrophorus electricus and Torpedo species and has been an important tool in the study of the receptor-ligand binding mechanism. Two distinct kinetic processes have been observed in studies with membranes from E. electricus. A minimum mechanism for the toxin reaction involves (i) the reversible binding of two toxin molecules to the receptor prior to the irreversible formation of toxin receptor complexes and (ii) a toxin-induced conformational change of the receptor which leads to an increase in the affinity of the receptor binding sites for toxin [Hess, G. P., Bulger, J. E., Fu, J.-j. L., Hindy, E. F., & Silberstein, R. J. (1975) Biochem. Biophys. Res. Commun. 64, 1018-1027]. Only one process has been detected in Torpedo membranes. Here, we determine whether the receptors in Torpedo californica and E. electricus membranes have different properties or whether the measurements and their interpretation were responsible for the different results. Two methods which are frequently used in binding studies to separate free and bound toxin, a CM-52 cellulose minicolumn assay and DE-81 filter disk assay, have been compared. The results obtained indicate that the interaction of toxin with receptor from T. californica is similar to that observed with receptor from E. electricus. The apparent differences which have been reported in the literature are shown to have arisen from the design of the experiments in which T. californica membranes were used. [less ▲]

Le traitement par chélateurs de l'hémochromatose post-transfusionnelle

in Revue Médicale de Liège (1981), 36

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

in Biométrie-Praximétrie (1981), 21(1-2), 13-27

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 ▲]

Etude stratigraphique des spores dans les couches de transition “Gedinnien-Siegenien” à Nonceveux et à Spa (Belgique)

in Annales de la Société Géologique de Belgique (1981), 104

Quelques aspects théoriques du problème des demi-collisions

in Nouveau Journal de Chimie (1981), 5

Iconographies de saints mosans

in Bulletin de la Société Royale Le Vieux-Liège (1981)

La présence d'anhydrase carbonique chez deux poissons de l'archipel des Kerguelen, Channichthys rhinoceratus, exempt d'hémoglobine et Notothenia magellanica de formule sanguine normale

in C R Acad Sc Paris (III) (1981), 293

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 ▲]

Précisions biostratigraphiques relatives au Dévonien Supérieur de Ferques (Boulonnais).

in Annales de la Société Géologique du Nord (1981), C

Analysis of JC Virus DNA Purified directlt from Human Progressive Multifocal Leukoencephalopathy Brains

in Journal of Virology (1981)

Human polyomavirus JC DNA was purified directly from the diseased brain tissue of two patients with progressive multifocal leukoencephalopathy (PML) by a method employing differential salt precipitation ... [more ▼]

Human polyomavirus JC DNA was purified directly from the diseased brain tissue of two patients with progressive multifocal leukoencephalopathy (PML) by a method employing differential salt precipitation (B. Hirt, J. Mol. Biol. 26:365-369, 1967). Each of the viral genomes (JC-NIH-1 and JC-NIH-2) was molecularly cloned intact in Escherichia coli, using pBR322, at their unique EcoRI (0.00 map unit) and BamHI (0.51 map unit) sites. The JC-NIH-1 genome was approximately 50 base pairs larger and the JC-NIH-2 genome was approximately 50 base pairs smaller than the prototype human polyomavirus JC (Mad-1) DNA. Analysis of the restriction endonuclease cleavage fragments of these two DNAs and the human polyomavirus JC (Mad-1) DNA revealed only slight differences which mapped in a region of the genome extending from 0.67 to 0.74 map unit. From previous homology studies, this region of variance corresponds to the noncoding region to the late side of the origin of DNA replication. [less ▲]

Studies on the primary structures of the exocellular D-Alanyl-D-Alanine peptidases of Streptomyces strain R61 and Actinomadura strain R39

in Biochimica et Biophysica Acta - General Subjects (1981), 671

The Mr 37 000 D-alanyl-D-alanine peptidase excreted by Streptomyces R61 and the Mr 53 000 D-alanyl-D-alanine peptidase excreted by Actinomadura R39 are both characterized by a very uneven distribution of ... [more ▼]

The Mr 37 000 D-alanyl-D-alanine peptidase excreted by Streptomyces R61 and the Mr 53 000 D-alanyl-D-alanine peptidase excreted by Actinomadura R39 are both characterized by a very uneven distribution of the basic (Arg + Lys) amino acid residues. Trypsin degradation of the heat-denatured enzymes generates (1) thirteen soluble peptides which contain from 2 to 28 residues in the case of the R61 enzyme and nineteen soluble peptides which contain 2 to 39 residues in the case of the R39 enzyme; and (2) three large segments or core peptides which, irrespective of the enzymes from which they originate, consist of 50-60, 70-80 and 110-120 residues. About 90% of the basic (Arg + Lys) amino acid residues are recovered in the soluble tryptic peptides. The core peptides represent 62% (Mr approximately 23 000) and 45% (Mr approximately 24 000) of the untreated R61 and R39 enzymes, respectively. One 28-residue soluble peptide isolated from the R61 enzyme represents the N-terminal portion of the protein whose sequence has been established. The penicillin attachment site of the R61 enzyme has been located in one of the core peptides. For the R39 enzyme, indirect evidence shows that the penicillin binding site is probably within one of the soluble peptides. [less ▲]

Determination du sexe des cranes au moyen de l'analyse discriminante logistique.

in Zeitschrift für Morphologie und Anthropologie (1981), 72(2), 171-9

La sidérurgie liégeoise face aux mutations structurelles de la sidérurgie mondiale. Euregio Maas-Rhein

in Euregio Maas-Rhein, Informationen und Materialen zur Geographie (1981), (9), 42-58

This article attempts to draw up a balance sheet of the steel industry in Liege at the end of 1981. It first describes the factories in Liege: their origin, their evolution since 1945 and their site and ... [more ▼]

This article attempts to draw up a balance sheet of the steel industry in Liege at the end of 1981. It first describes the factories in Liege: their origin, their evolution since 1945 and their site and condition. It then tries to define the difficulties and handicaps faced by Cockerill S.A. in the present crisis : a limited home market, international competition, the depreciation and scattered locations of the installations, the financial and managerial problems, the cost of salaries and wages and the social climate. It finally deals with the financial, technical and social changes in progress in order to make it understood how important the changes are for the future of the company and the region. [less ▲]

Le thorax traumatique

in Revue Médicale de Liège (1981), 36(4), 129-137

The prognostic significance of serum alpha 1-acid glycoprotein changes in acute myocardial infarction.

in Clinica Chimica Acta (1981), 115(2), 199-209

Serum alpha 1-acid glycoprotein and haptoglobin concentrations were evaluated in 151 patients with acute myocardial infarction (MI) during the first ten days of hospitalization. Maximum glycoprotein ... [more ▼]

Serum alpha 1-acid glycoprotein and haptoglobin concentrations were evaluated in 151 patients with acute myocardial infarction (MI) during the first ten days of hospitalization. Maximum glycoprotein concentrations were found to be related to myoglobin and enzyme peak levels. Glycoprotein levels recorded upon patients' admission did not vary for acute phase survivors and early deaths (15 patients), but the latter demonstrated significantly higher alpha 1-acid glycoprotein levels (p less than 0.05) on day 1. The maximum glycoprotein concentrations were, however, reached too long after the onset of acute MI to be of interest for short-term prognosis. Comparison of the evolution of the two glycoproteins investigated in late deaths (10 patients) and in 6-month survivors indicated increased alpha 1-acid glycoprotein levels in non-survivors, with a maximum discrimination occurring on day 8 (p less than 0.001). Haptoglobin was not significantly different in the two groups and even demonstrated lower concentrations from day 4 to day 10 in non-survivors. The decrease of haptoglobin levels in patients with hepatic dysfunction could explain the divergent results given by the serum concentrations of the two glycoproteins to predict mortality. We show in this study that alpha 1-acid glycoprotein measured at the end of hospitalization can give relevant prognostic information for the 6-month period following acute MI. [less ▲]

Penicillin binding proteins and model transpeptidase activity of the plasma membranes of Streptomyces strains R61 and rimosus

in FEMS Microbiology Letters (1981), 12(3), 299-303

Streptomyces R61 and S. rimosus have an atypical penicillin-binding protein (PBP) pattern characterized by a large amt. of a 25,000-mol.-wt. protein and a small amt. of a 50,000-mol.-wt. protein. The 25 ... [more ▼]

Streptomyces R61 and S. rimosus have an atypical penicillin-binding protein (PBP) pattern characterized by a large amt. of a 25,000-mol.-wt. protein and a small amt. of a 50,000-mol.-wt. protein. The 25,000-mol.-wt. PBP exhibits high thermostability and apparently is the membrane-bound enzyme which catalyzes the model transpeptidase reaction in which Ac2-L-Lys-D-Ala-D-Ala serves as the carbonyl donor and Gly-Gly as the amino acceptor. Whether the thermolabile 50,000-mol.-wt. PBP is also a transpeptidase and is degraded into small fragments or converted into the 25,000-mol.-wt. PBP is unclear. [on SciFinder(R)] [less ▲]

Plasma insulin level in double-muscled and conventional bulls during the first year of life

in Zeitschrift für Tierzüchtung und Züchtungsbiologie (1981), 98

Concentration of plasma insulin has been determined by radioimmunoassay in conventional and double-muscled bulls at 80 (I1), 131 (I2), 227 (I3) and 370 I(4) d of age. Double-musceld have lower plasma ... [more ▼]

Concentration of plasma insulin has been determined by radioimmunoassay in conventional and double-muscled bulls at 80 (I1), 131 (I2), 227 (I3) and 370 I(4) d of age. Double-musceld have lower plasma levels of insulin at all ages studied, which is consistent with the reduced fatty tissue of double-muscling. The correlations between insulin level and growth traits, estimated separately fo reach type of bulls, are low and most often positive and significant in double-muscled. Insulin level tends to be negatively correlated with the lean percent from the 7th rib cut. The correlation between the successive insulin levels are generally positive. The correlations between the concentration of insulin and of GH are low and negative. [less ▲]

Incidence of low Apgar score at birth in high risk pregnancies. The Journal of Obstetrics and Gynaecology,

in Journal of Obstetrics & Gynaecology : The Journal of the Institute of Obstetrics & Gynaecology (1981), 2

Des activités de connaissance physique à l'école maternelle

in Journal du Canton d'Engis (1981), 11

Bêta-bloquants et insuffisance rénale

in Médecine et Hygiène (1981), 39

L'hypertension artérielle est fréquente lorsque la fonction rénale est altérée. Elle doit être corrigée pour ralentir l'évolution de la néphropathie et prévenir les complications vasculaires extra-rénales ... [more ▼]

L'hypertension artérielle est fréquente lorsque la fonction rénale est altérée. Elle doit être corrigée pour ralentir l'évolution de la néphropathie et prévenir les complications vasculaires extra-rénales. Parmi les nombreux traitements dont nous disposons, les bêta-bloquants sont de plus en plus utilisés. Cette étude a pour but de voir si leur emploi est sans danger pour la fonction rénale et quel agent choisir parmi le grand nombre de substances disponibles sur le marché. Leur efficacité sur le contrôle tensionnel est identique à celle d'autres thérapeutiques. Les études classiques sont en accord avec l'expérience clinique pour montrer une bonne tolérance lors de l'utilisation de ces agents. Cependant, dans l'insuffisance rénale, il est nécessaire de bien connaître leur pharmacocinétique. Les bêta-bloquants peuvent être divisés en substances lipophiles et hydrophiles. Ces dernières nécessitent une adaptation des doses dès que la filtration glomérulaire est réduite à 30 ml/min. L'élément majeur qui ressort de cette revue est l'importance d'une surveillance étroite de la réponse obtenue et de la tolérance chez ces patients fragiles quelle que soit la drogue utilisée. [less ▲]

Myotis bechsteini en Corse

in Mammalia (1981), 45(3), 380-381

Visna-Maedi chez le mouton

in Annales de Médecine Vétérinaire (1981)

The first events of protochlorophyll(ide) photoreduction investigated in etiolated leaves by means of the fluorescence excited by short, 610 nm laser flashes at room temperature

in Photobiochemistry and Photobiophysics (1981), 2

Aspects cliniques et anatomopathologiques de cas répétés d'orchite chez des taureaux reproducteurs en Belgique

in Annales de Médecine Vétérinaire (1981), 125

Etude de la tolérance biologique de l'alimentation parentérale chez le nouveau né en dessous de 1500 g

in Groupe contact de nutrition enterale et parenterale du FNRS (1981)

unabsorbable markers 144Ce, Cr203 powder.; Validite de la methode indirecte de determination des temps moyens de retention de la phase solide des digesta chez le porc.

in Bulletin des Recherches Agronomiques de Gembloux (1981), 16(4), 399-404

La subordination en latin

in Revue de l'Organisation Internationale pour l'Etude des Langues Anciennes par Ordinateur (1981), (Numéro spécial), 1-201

Etude ultrastructurale des effets de la neuraminidase sur des processus palatins de rat.

in Bulletin de l'Association des Anatomistes (1981), 65(190), 329-39

In a previous work, we demonstrated that palatine processes treated with 10 micrograms/ml neuraminidase for 30 minutes at 37 degrees C show a delayed fusion in vitro. In order to investigate the effects ... [more ▼]

In a previous work, we demonstrated that palatine processes treated with 10 micrograms/ml neuraminidase for 30 minutes at 37 degrees C show a delayed fusion in vitro. In order to investigate the effects of neuraminidase, the treated palatine processes were observed with the aid of transmission and scanning electron microscopy. The effect of neuraminidase is exclusively detectable on superficial flat cells of the palatine processes, especially the cells of the medial edge of the process. The epithelial basal cells remain unchanged. Observed with the S.E.M., the superficial epithelial cells show bubbles, become spherical and detached. To explain these observations, we namely propose the following hypothesis: the action of neuraminidase prevents the fusion of the palatine processes because it denudes basal cells bearing a too immature cell coat for ensuring sufficient adherence between the palatine processes. [less ▲]

Reflexions sur les aptitudes des terres en milieu mediterraneen.

in Pédologie (1981), 31(1),

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 ▲]

Saint Lambert. Martyr et saint Liégeois

in Archeologia : Fouilles et Découvertes (1981)

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

Etude stratigraphique des spores du Dévonien inférieur au bord sud du Synclinorium de Dinant (Belgique) et leurs applications

in Annales de la Société Géologique de Belgique (1981), 104

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

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

Herpesvirus in infertile bull's testicle

in Veterinary Record : Journal of the British Veterinary Association (1981), 108(19), 426