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See detailStructure des parois de Bacillus megaterium KM II. étude des complexes mucopeptidique et phosphomucopolysaccharidique
Ghuysen, Jean-Marie ULg; Leyh-Bouille, Mélina; Dierickx, L.

in Biochimica et Biophysica Acta (1962), 63

Bacillus megaterium KM cell walls are composed of two distinct heteropolymers. The first, referred as to X-teichoic acid, presents a molecular weight of about 11000. It consists of about 10 subunits ... [more ▼]

Bacillus megaterium KM cell walls are composed of two distinct heteropolymers. The first, referred as to X-teichoic acid, presents a molecular weight of about 11000. It consists of about 10 subunits containing P, glucose and GlcNHAc in the molar ratio 1/2/1.3 as well as a polyol compound. It does not play any role in maintaining the rigidity of the wall. The second can be visualized as a three-dimensional network of structural subunits consisting of four mucopeptide residues with an average composition GlcNHAc1- (N-acetylmuramic acid)1-Ala2.20-Glu1- ([alpha],[epsilon]-diaminopimelic acid)1. They also contain glucose. This mucopeptide is the basal structure of the wall. The two heteropolymers are present in equimolar proportions. They are covalently bound through glucosido-muraminyl bridges branched on some of the alanine residues of the basal mucopeptide thanks to amidic linkages. [less ▲]

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See detailPurification de la [beta]-(1-4)-N-acétylhexosaminidase sécrétée par Streptomyces albus G et active sur les parois de Micrococus lysodeikticus
Dierickx, L.; Ghuysen, Jean-Marie ULg

in Biochimica et Biophysica Acta (1962), 58

The N-acetylhexosaminidase (referred as Str) secreted by Streptomyces albus G. has been purified by zone electrophoresis. It is slightly less basic than egg-white lysozyme. Its isoelectric point is close ... [more ▼]

The N-acetylhexosaminidase (referred as Str) secreted by Streptomyces albus G. has been purified by zone electrophoresis. It is slightly less basic than egg-white lysozyme. Its isoelectric point is close to pH 10.3. It has no action on the [alpha]- and [beta]-phenylglycosides of N-acetylglucosamine and on the disaccharides [beta]-(1-4)-di-N-acetylglucosamine (di-N-acetylchitobiose) and [beta]-(1-6)-N-acetylglucosaminyl-N-acetylmuramic acid but it splits the tetrasaccharide [beta]-(1-4)-tetra-N-acetylglucosamine(tetra-N-acetylchitotetraose) in di-N-acetylchitobiose. Contrary to lysozyme, it does not split the tetrasaccharide O-[beta]-N-acetylglucosaminyl-(1-6)-O-[beta]-N-acetylmuraminyl-(1-4)-O-[beta]-N-acetylglucosaminyl-(1-6)-[beta]-N-acetylmuramic acid in disaccharide by hydrolyzing the [beta](1-4) linkage. In those conditions the disaccharide liberated, as well as the tetrasaccharide, from Microccus lysodeikticus cell walls after incubation with the N-acetylhexosaminidase Str, can not be put down to a further digestion of some tetrasaccharidic fragments. A chitobiase only active on the [beta]-phenyl-glycoside of N-acetylglucosamine and on the di-N-acetylchitobiose is also present in contentrated culture filtrates. It is a protein acid at pH 6.6. [less ▲]

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See detailLe spectre de la comete "Seki-Lines" (1962c)
Swings, Polydore ULg; Fehrenbach, Charles

in Publications de l'Observatoire de Haute-Provence (1962), 6(12), 3

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See detailObjectives of Space Investigations of Comets
Swings, Polydore ULg

in Deutsch, Armin J.; Klemperer, Wolfgang B. (Eds.) Space Age Astronomy : Proceedings of an international Symposium held August 7-9, 1961 at the California Institute of Technology in conjunction with the 11th General Assembly of the International Astronomical Union (IAU, GA, 11) (1962)

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See detailCurrent objectives of astronomical space research (from gamma to infrared radiation)
Swings, Polydore ULg

in Deutsch, Armin J.; Klemperer, Wolfgang B. (Eds.) Space Age Astronomy : Proceedings of an international Symposium held August 7-9, 1961 at the California Institute of Technology in conjunction with the 11th General Assembly of the International Astronomical Union (IAU, GA, 11) (1962)

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See detailPossible contributions of space experiments to cometary physics
Swings, Polydore ULg

in SAO Special Report (1962), 111

Possible space experiments for observing the geometric, spectroscopic, and photometric behavior of comets are described. These experiments are proposed beacause an interpretation of cometary data may ... [more ▼]

Possible space experiments for observing the geometric, spectroscopic, and photometric behavior of comets are described. These experiments are proposed beacause an interpretation of cometary data may yield essential data on the formation and evolution of the solar system and the nature of interplanetary space. The various ways of obtaining significant planetary data are examined. These include the use of: (1) far ultraviolet observations by orbiting astronomical observatories; (2) artificial gaseous comets formed by high-altitude release of gases such as NH[SUB]3[/SUB]; (3) orbiting artificial cometary nuclei such as blocks of CO[SUB]2[/SUB] or NH[SUB]3[/SUB] ice, perhaps with an addition of meteoric material; and (4) fly-by p probes of a comet such as Encke's periodic comet. The significance of the data that would be obtained by each of these methods is predicted. [less ▲]

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See detailExtra-Terrestrial Observations: Reports of national space-research programs 381
Swings, Polydore ULg

in Transactions of the International Astronomical Union. Series B, Proceedings of the general assembly (1962), 11

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See detailUn gisement de Pyritoshaera barbaria dans le Cambrien de la vallée du Bayehon (Ardennes Belges)
Duchesne, Jean-Clair ULg

in Annales de la Société Géologique de Belgique (1962), 86

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See detailDéplacements radiaux à la surfacz des étoiles variables magnétiques
Renson, Pierre ULg

in Bulletin de la Société Royale des Sciences de Liège (1962), 31

Periodic radial displacement curves are obtained by mechanical integration of the radial velocities for Eu II, Cr II, Fe II and Fe I in HD 125248 and alpha2 C Vn. The mean observed velocities, which are ... [more ▼]

Periodic radial displacement curves are obtained by mechanical integration of the radial velocities for Eu II, Cr II, Fe II and Fe I in HD 125248 and alpha2 C Vn. The mean observed velocities, which are not exactly the same for the various elements, are also given. The Eu-Cr mean curve is very similar to the Fe ones. Since the ranges are not small with regard to the radius, it is suggested that the line shifts are perhaps not only due to a Doppler effect, but also for instance to a Stark effect. [less ▲]

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See detailThermodynamic properties of the monoatomic linear chain
Pirenne, Jean; Renson, Pierre ULg

in Physica (1962), 28

The analytical and numerical study of the thermodynamic properties of a regular mono-atomic linear chain leads to a criticism of Blackman's results concerning the specific heat curve and the Debye ... [more ▼]

The analytical and numerical study of the thermodynamic properties of a regular mono-atomic linear chain leads to a criticism of Blackman's results concerning the specific heat curve and the Debye temperature; it further brings useful mathematical informations for the study of the same properties of a disordered isotopic linear chain. [less ▲]

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See detailEléments de Géométrie infinitésimale
Renson, Pierre ULg

Learning material (1962)

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See detailComportement des raies interdites de l'oxygène dans les comètes. I : Observations
Swings, Polydore ULg

in Annales d'astrophysique (1962), 25

The forbidden lines of [OI] are present in many cometary spectra. Sometimes, the auroral transition λ 5577 is strongest, sometimes the nebular transition λ 6300-λ 6364. The behaviour of [OI] in various ... [more ▼]

The forbidden lines of [OI] are present in many cometary spectra. Sometimes, the auroral transition λ 5577 is strongest, sometimes the nebular transition λ 6300-λ 6364. The behaviour of [OI] in various comets is described. [less ▲]

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See detailSur la pensée et l'action pédagogique de Diesterweg
de Landsheere, Gilbert ULg

in Paedagogica Historica (1962), 11(2), 211-233

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See detailLes laboratoires de langues
de Landsheere, Gilbert ULg

in Education : tribune libre d'information et de discussion pédagogiques (1962), (78), 103-110

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See detailL'éducation et la formation des maîtres dans un pays en plein développement: la Jamaïque
de Landsheere, Gilbert ULg

in International Review of Education (1962), 8(1), 41-60

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See detailStructure des parois de Bacillus megaterium KM I. Isolement de l'amidase et d'un enzyme nouveau sécrétés par Streptomyces albus G et actifs sur les parois de Bacillus megaterium KM et de Micrococcus lysodeikticus
Ghuysen, Jean-Marie ULg; Leyh-Bouille, Melina; Dierickx, L.

in Biochimica et Biophysica Acta (1962), 63(2), 286-296

The Streptomyces albus G enzymic complex of the F2B preparation has been fractionated by zone electrophoresis in sucrose gradient. Five enzymes have been shown to be present and three of them have been ... [more ▼]

The Streptomyces albus G enzymic complex of the F2B preparation has been fractionated by zone electrophoresis in sucrose gradient. Five enzymes have been shown to be present and three of them have been fully separated. Three distinct enzymes make the casein no further precipitable by the trichloroacetic acid. They are likely not to have any action on Bacillus megaterium KM and on Micrococcus lysodeikticus cell walls. A fourth enzyme is the amidase previously studied which splits the muraminyl-alanine linkages present in the bacterial walls. The amidase does not clarify by itself the wall suspensions so far examined but enhances the lytic activity of a fifth enzyme also present in the F2B preparation. As lysozyme and Streptomyces N-acetylhexosaminidase, this fifth enzyme seems to act at the level of the polysaccharide residues of the walls basal mucopeptide but, contrary to those enzymes, its hydrolyzing action does not induce the liberation of free oligosaccharides from Micrococcus lysodeikticus walls. This enzyme will be referred to as Enzyme “32”. [less ▲]

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See detailAction of chlordiazépoxide on two types of temporal conditioning in rats
Richelle, Marc ULg; Xhenseval, B.; Fontaine, Ovide ULg et al

in International Journal of Neuropharmacology (1962), 1

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See detailAction du chlordiazépoxide sur les régulations temporelles dans un comportement conditionné chez le chat
Richelle, Marc ULg

in Archives Internationales de Pharmacodynamie et de Thérapie (1962), 140

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See detailNonconsumption of the reinforcer under drug action
Faidherbe, J.; Richelle, Marc ULg; Schlag, J.

in Journal of the Experimental Analysis of Behavior (1962), 5(4), 521-524

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