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See detailAcetylhexosamine compounds enzymically released from Micrococcus lysodeikticus cell walls: III. The structure of di- and tetra-saccharides released from cell walls by lysozyme and Streptomyces F1 enzyme
Salton, M. R. J.; Ghuysen, Jean-Marie ULg

in Biochimica et Biophysica Acta (1960), 45

Two compounds, both of which have been isolated from cell walls of Micrococcus lysodeikticus digested with lysozyme or Streptomyces F1 enzyme, have been identified as di- and tetra-saccharides. The ... [more ▼]

Two compounds, both of which have been isolated from cell walls of Micrococcus lysodeikticus digested with lysozyme or Streptomyces F1 enzyme, have been identified as di- and tetra-saccharides. The reducing groups of the di- and tetra-saccharides and those of the high-molecular weight, non-dialysable compounds belong to muramic acid. [beta]-glucosidase yields free N-acetylglucosamine and N-acetylmuramic acid from the di- and tetra-saccharides. The proposed structure for the di-saccharide liberated by lysozyme and F1 is: 6-O-[beta]-N-acetylglucosaminyl-N-acetylmuramic acid. The tetra-saccharides isolated from lysozyme and F1 digests appear to be identical. The structure proposed for the tetra-saccharide isolated from lysozyme digested walls is: O-[beta]-N-acetylglucosaminyl-(I-->6)-O-[beta]-N-acetylmuraminyl-(I-->4)-O-[beta]-N-acetylglucosaminyl- (I-->6)-[beta]-N-acetylmuramic acid. Both lysozyme and Streptomyces F1 enzyme degrade di- and tetra-chitobiose, indicating their [beta](I-->4) N-acetyl hexosaminidase activity. [less ▲]

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See detailRapport sur l'année académique 1959-1960
Dubuisson, Marcel ULg

Speech (1960)

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See detailAcetylhexosamine compounds enzymically released from Micrococcus lysodeikticus cell walls: I. Isolation and composition of acetylhexosamine and acetylhexosamine-peptide complexes
Ghuysen, Jean-Marie ULg; Salton, M. R. J.

in Biochimica et Biophysica Acta (1960), 40

Some of the dialyzable products of the digestion of Micrococcus lysodeikticus cell walls by lysozyme and by a similar enzyme secreted by a Streptomyces have been isolated and their compositions determined ... [more ▼]

Some of the dialyzable products of the digestion of Micrococcus lysodeikticus cell walls by lysozyme and by a similar enzyme secreted by a Streptomyces have been isolated and their compositions determined. The two simplest substances released by both enzymes are (a) a di-saccharide of N-acetylmuramic acid-N-acetylglucosamine and (b) an N-acetylmuramic acid-N-acetylglucosamine complex. Seven peptide-acetyl-amino sugar complexes have been isolated. All seven compounds contain lysine, glutamic acid, glycine, alanine in the same molecular proportions as found in the original cell wall and a di-saccharide moiety of N-acetylmuramic acid and N-acetylglucosamine. One of the peptide-amino sugar complexes contains in addition a polysaccharide moiety [N-acetylmuramic acid-N-acetylglucosamine]10. [less ▲]

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See detailQuelques réflexions d'un spectroscopiste
Swings, Polydore ULg

in Annales d'astrophysique (1960), 23

Individual spectroscopic studies are of great importance. Spectroscopic observations in the infra-red and for ultra-violet should be prepared and our knowledge of spectroscopic properties in classical ... [more ▼]

Individual spectroscopic studies are of great importance. Spectroscopic observations in the infra-red and for ultra-violet should be prepared and our knowledge of spectroscopic properties in classical fields should also be improved in order to find solutions to the following problems : interstellar matter, planetary nebulae, symbiotic stars, W, Of and Be stars, relative abundances in stars of population type II, isotopic abundances in stars and planets, variable stars, etc.... [less ▲]

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See detailIntérêt de la reconstitution paléogéographique pour l'exploitant charbonnier
Duchesne, Jean-Clair ULg; Harmant, Beaudouin

in Technique et Humanisme (1960), 5

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See detailParticules inconnues I
Renson, Pierre ULg

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Sciences (1960), 46

The possible existence of undiscovered elementary particles is discussed. The electric charge Q an the "neutrinonic charge" R, introduced in a preceding paper, are given for two such particles, which are ... [more ▼]

The possible existence of undiscovered elementary particles is discussed. The electric charge Q an the "neutrinonic charge" R, introduced in a preceding paper, are given for two such particles, which are baryons: Q=1, R=0 and Q=-1, R=-2; for the newly discovered D-meson, they are Q=1, R=1. [less ▲]

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See detailParticules inconnues II
Renson, Pierre ULg

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Sciences (1960), 46

The X and Y particles predicted in part I have presumably masses of about 2150 and 2900 e. m. respectively. They may decay respectively into a nucleon and a Xi-hyperon by emitting a pion; lifetimes of the ... [more ▼]

The X and Y particles predicted in part I have presumably masses of about 2150 and 2900 e. m. respectively. They may decay respectively into a nucleon and a Xi-hyperon by emitting a pion; lifetimes of the order of 10-10 s may be expected (weak interactions). The mass of the D-meson is about 1670 e. m. and it decays into a K-meson and one or two pions. Leptonic modes of decay are also possible. The dimension 3 of the charge-space introduced ina preceding paper is confirmed. The correlations considered in tha paper are re-examined. [less ▲]

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See detailDéveloppements en séries de Fourier
Renson, Pierre ULg

Learning material (1960)

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See detailEléments de calcul des variations
Renson, Pierre ULg

Learning material (1960)

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See detailMécanisme d'excitation des bandes de Swan des comètes
Stawikowski, A.; Swings, Polydore ULg

in Annales d'astrophysique (1960), 23

The high resolution spectrograms of Comet Mrkos (1957d) reveal the essential features of the rotational structure of the Swan-bands. Intensity anomalies observed within the (1 - 0) and (2 - 1) transitions ... [more ▼]

The high resolution spectrograms of Comet Mrkos (1957d) reveal the essential features of the rotational structure of the Swan-bands. Intensity anomalies observed within the (1 - 0) and (2 - 1) transitions are due to the presence of absorption lines in the exciting solar radiation. It is thus proved that the Swan bands are excited by fluorescence, although their lower level 3πu is not the ground electronic state of C2. [less ▲]

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See detailLes teaching machines
de Landsheere, Gilbert ULg

in Education : tribune libre d'information et de discussion pédagogiques (1960), (65), 25-37

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See detailLa pédagogie de Niemeyer
de Landsheere, Gilbert ULg

Doctoral thesis (1960)

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See detailLa connaissance de la lettre, condition de la lecture globale
de Landsheere, Gilbert ULg

in Cahiers de Pédagogie et d’Orientation Professionnelle (1960)

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See detailLes observations astronomiques au dehors de l’atmosphère terrestre
Swings, Polydore ULg

Book published by Centre National de Recherches de l’Espace. (1960)

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See detailSuggested french translations of expressions in the field of operant conditioning
Richelle, Marc ULg

in Journal of the Experimental Analysis of Behavior (1960), 3(2), 167-170

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