Faut-il créer en Belgique de nouvelles institutions universitaires?

Speech (1962)

Purification de la [beta]-(1-4)-N-acétylhexosaminidase sécrétée par Streptomyces albus G et active sur les parois de Micrococus lysodeikticus

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 ▲]

Objectives of Space Investigations of Comets

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)

Possible contributions of space experiments to cometary physics

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 ▲]

Un gisement de Pyritoshaera barbaria dans le Cambrien de la vallée du Bayehon (Ardennes Belges)

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

Thermodynamic properties of the monoatomic linear chain

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 ▲]

Comportement des raies interdites de l'oxygène dans les comètes. I : Observations

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 ▲]

Les laboratoires de langues

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

Structure 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

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 ▲]

Action du chlordiazépoxide sur les régulations temporelles dans un comportement conditionné chez le chat

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