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See detailLes essaimages scientifiques de notre Alma Mater
Dubuisson, Marcel ULg

Speech (1966)

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See detailStructure of the cell wall of Micrococcus lysodeikticus. I. Study of the structure of the glycan
Leyh-Bouille, Mélina; Ghuysen, Jean-Marie ULg; Tipper, Donald J. et al

in Biochemistry (1966), 5(10), 3079-3090

The glycan portion of the cell wall of Micrococcus lysodeikticus, or at least the greatest part of it, consists of linear chains of alternating N-acetyl-glucosamine and N-acetylmuramic acid residues, both ... [more ▼]

The glycan portion of the cell wall of Micrococcus lysodeikticus, or at least the greatest part of it, consists of linear chains of alternating N-acetyl-glucosamine and N-acetylmuramic acid residues, both in the pyranose ring form. Both glycosidic links are 1,4. The links from N-acetylglucosamine to N-acetyl-muramic acid and probably the links from N-acetyl-muramic acid to N-acetylglucosamine are in the β configuration. At least 40% of the N-acetylmuramic residues are not substituted by peptide. This structure is based on the quantitative isolation of the disaccharides N-acetylglucosaminyl-β-1,4-N-acetylmuramic acid and N-acetylmuramyl-(β?)-l,4-N-acetylglucosamine, of the trisaccharides N-acetylglucosaminyl-β-l,4-N-acetyl-muramyl-(β?)-1,4-N-acetylglucosamine and N-acetyl-muramyl-(β?)-1,4-N-acetylglucosaminyl-β-1,4-N-acetyl-muramic acid, and of the tetrasaccharide N-acetylglucos-aminyl-β-1,4-N-acetylmuramyl-(β?)-l,4-N-acetylglucos-aminyl-β-l,4-N-acetylmuramic acid. An octasaccharide the structure of which has not been fully elucidated has also been isolated. [less ▲]

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See detailPeptide cross-links in bacterial cell wall peptidoglycans studied with specific endopeptidases from Streptomyces albus G
Petit, Jean-François; Munoz, Emilio; Ghuysen, Jean-Marie ULg

in Biochemistry (1966), 5(8), 2764-2776

Evidence is given for the existence of at least four types of peptide cross-linkages in lysine-containing peptidoglycans of cell walls from Gram-positive bacteria. Three kinds of such cross-linkages, by ... [more ▼]

Evidence is given for the existence of at least four types of peptide cross-linkages in lysine-containing peptidoglycans of cell walls from Gram-positive bacteria. Three kinds of such cross-linkages, by which the є-amino group of the lysine residue of one peptide subunit is joined to the carboxyl group of the terminal D-alanine of a second, have been demonstrated, namely: bridging by tri-L-alanine (Micrococcus roseus Thr(-)), by tri-L-alanine-L-threonine (M. roseus R 27), and by pentaglycine (Staphylococcus aureus Copenhagen) residues. The lytic Streptomyces SA endopeptidase hydrolyzes D-alanylglycyl linkages in S. aureus and D-alanyl-L-alanine linkages in M. roseus, i.e., at the amino terminus of the peptide bridges and at the carboxyl terminus of the peptide subunits. The lytic Streptomyces MR endopeptidase hydrolyzes L-alanyl-L-threonine linkages within the peptide bridges in M. roseus R 27 and, with a much smaller rate, L-alanyl-L-alanine linkages within the peptide bridges in M. roseus Thr(-)). A fourth kind of cross-linkage, in which no additional amino acid is involved, can also occur in the form of a direct bonding between the C-terminal alanine residue of one peptide subunit and the є-amino group of the lysine residue of a second (Micrococcus lysodeikticus). This latter alanyl-є-lysine bond is sensitive to a third lytic Streptomyces enzyme, the ML endopeptidase. A structure for the peptide moiety of the peptidoglycan of M. roseus is proposed and compared to the peptidoglycan structure in S. aureus. The present studies lend support to recent proposals dealing with the mechanism of action of penicillin. [less ▲]

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See detailUNESCO-Afrique, deuxième génération : éducation préscolaire et jeux coutumiers
de Landsheere, Gilbert ULg

in International Review of Education (1966), XII(3), 288-300

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See detailAnthropologie culturelle et éducation comparée
de Landsheere, Gilbert ULg

in International Review of Education (1966), XII(1), 61-72

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See detailEtude par Spectrométrie de Masse des Mécanismes d'Apparition des Ions Négatifs dans le Méthane.
Locht, Robert ULg

in Extrait du Bulletin de la Société Royale des Sciences de Liège (1966), 35(11-12), 764-777

The negative fragment ions appearing in methane have been investigated using a sector field mass spectrometer. By recording the ionzation efficiency curves of each ion it has been possible to determine ... [more ▼]

The negative fragment ions appearing in methane have been investigated using a sector field mass spectrometer. By recording the ionzation efficiency curves of each ion it has been possible to determine the appearance potentials for several processes. Interpretations of the mechanisms for these critical potentials have been attempted. [less ▲]

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See detailSéparation rapide des minéraux des roches
Duchesne, Jean-Clair ULg

in Annales de la Société Géologique de Belgique (1966), 89

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See detailEducational trends in Belgium
de Landsheere, Gilbert ULg

in Scottish Educational Journal (1966)

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See detailLa binaire spectroscopique et variable magnétique HD 8441
Renson, Pierre ULg

in Bulletin de la Société Royale des Sciences de Liège (1966), 35

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See detailMagnetic Stars
Ledoux, Paul; Renson, Pierre ULg

in Annual Review of Astronomy and Astrophysics (1966), 4

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See detailFormation et rémunération des maîtres aux Etats-Unis et dans les pays du Conseil de l'Europe
de Landsheere, Gilbert ULg

in Education : tribune libre d'information et de discussion pédagogiques (1966), (101), 75-89

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See detailLe dernier combat pédagogique de W.H. Kilpatrick
de Landsheere, Gilbert ULg

in Education : tribune libre d'information et de discussion pédagogiques (1966), 97

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See detailLecteurs et lectures : recherches sur l'évaluation et le contrôle objectifs
de Landsheere, Gilbert ULg

in Actes du XIIIe Colloque international de Pédagogie expérimentale, Genève, 2-5 avril 1966 (1966)

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See detailTendances éducatives en Belgique
de Landsheere, Gilbert ULg

in International review of education = Internationale Zeitschrift für Erziehungswissenschaft = Revue internationale de pédagogieInternational review of (1966), 4

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See detailPour une réforme de la formation des maîtres
de Landsheere, Gilbert ULg

in Education : tribune libre d'information et de discussion pédagogiques (1966), 100

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See detailUnesco-Afrique : deuxième génération. Education prescolaire et jeux coutumiers
de Landsheere, Gilbert ULg

in International review of education = Internationale Zeitschrift für Erziehungswissenschaft = Revue internationale de pédagogie (1966), 12(3), 289-299

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See detailBehavioral effects of a prolonged treatment with small doses of morphine in cats
Djahanguiri, B.; Richelle, Marc ULg; Fontaine, Ovide ULg

in Psychopharmacologia (1966), 9

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See detailEtude d'une nouvelle technique d'évitement sans signal avertisseur chez le rat
Fontaine, Ovide ULg; Beaujot, A.; Didelez, M. et al

in Psychologica Belgica (1966), 6

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See detailFaible agressivité des eaux de fonte des glaciers: l'exemple de la Marmolada (Dolomites)
Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1966), 89(6), 177-188

From some measurements of pH and hardness in melt-waters of the Marmolada Glacier (Dolomites), it appears that these waters are - or at least were in September 1965 - strongly alkaline and not very ... [more ▼]

From some measurements of pH and hardness in melt-waters of the Marmolada Glacier (Dolomites), it appears that these waters are - or at least were in September 1965 - strongly alkaline and not very aggressive towards their limestone bedrock; pH on the glacier and just nearby are between 8.8 and 7.8. Calculated CO2 pressure is lower in the glacier (3.6 10 -4 atm) than in anyone of four other samples analysed in the region. [less ▲]

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See detailEnzymes that degrade bacterial cell walls
Ghuysen, Jean-Marie ULg; Tipper, Donald J.; Strominger, Jack L.

in Methods in Enzymology (1966), 8

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