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See detailLa digestion stomacale chez un paresseux : l'Unau Choloepus Hoffmanni Peters
Denis, C.; Jeuniaux, Charles ULiege; Gerebtzoff, M.A. et al

in Annales de la Société Royale Zoologique de Belgique (1966), 97(1), 8-29

1. The anatomical structure of the stomach in the didactyl sloth Choloepus hoffmanni Peters - Mammal of the sub-order of Xenarthra, family of Bradipodidae - conforms to the descripttion of that of ... [more ▼]

1. The anatomical structure of the stomach in the didactyl sloth Choloepus hoffmanni Peters - Mammal of the sub-order of Xenarthra, family of Bradipodidae - conforms to the descripttion of that of Choloepus didactylus. 2. The histological features of the various paunches of the stomach in Choloepus hoffmanni are similar to those already described in Bradypus cuculliger, a tridactyl sloth. 3. The cardial paunches and the "fundus" of the stomach in the sloth are homologous to the rumen of Ruminants although the "fundus" secretes mucus. The glandular prepyloric paunch in the sloth is homologous to the abomasum. The reticulum has no anatomical counterpart in the sloth. The reabsorption of the water content of the stomach, which in Ruminants occurs mainly in the psalterium is performed by the prepyloric muscular paunch in the sloth. 4. Microscopical observations on stomach contents of the sloth showed the presence of a rich microbial population. No ciliates have been observed. 5. The bacteria hydrolyse cellulose into sugars. 6. Reducing sugars are in turn transformed into short chain volatile fatty acids, 370-950 uM/10 ml, an amount similar to that found in the rumen of the Sheep and Setonix brachyurus, a macropod Marsupial. 7. These fatty acids are reabsorbed by the gastric mucosa and transferred to the gastric venous blood as found in Ruminants and in a herbivorous macropod Setonix brachyurus. 8. The evolutionary convergence of this ruminant-like digestion is discussed. [less ▲]

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

Speech/Talk (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 ULiege; 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 detailStructural variations in bacterial cell wall peptidoglycans studied with Streptomyces F1 endo-N-acetylmuramidase
Munoz, Emilio; Ghuysen, Jean-Marie ULiege; Leyh-Bouille, Mélina et al

in Biochemistry (1966), 5(10), 30913098

An improved procedure for the purification of the Streptomyces FI [beta]-l,4 endo-N-acetylmuramidase is described. FI enzymes digests cell walls from bacteria of the most important grampositive genera ... [more ▼]

An improved procedure for the purification of the Streptomyces FI [beta]-l,4 endo-N-acetylmuramidase is described. FI enzymes digests cell walls from bacteria of the most important grampositive genera. Its mechanism of action upon cell walls of Staphylococcus aureus, Micrococcus roseus, and Micrococcus lysodeikticus has been studied. To all appearances, the affinity of the F1 enzyme for the glycosidic linkages of N-acetylmuramic add in the polysaccharide chains is greatly enhanced by the peptide substitution of these residues. From an integration of the properties of the FI enzyme digests of various cell walls, it appears that tight network peptidoglycans, typified by a high degree of cross-linkings of the polysaccharide chains through peptide unites, as they occur in cell wals of S. aureus and M. roseus, are not encountered in many cell walls from gram-positive bacteria. [less ▲]

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See detailIntroduction - Actualité du sujet
Campus, Ferdinand ULiege

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

L'auteur relève diverses manifestations de l'intérêt croissant porté depuis un quart de siècle à la durabilité des constructions en béton. Il tente d'en dégager les raisons et l'orientation.

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See detailConstatations effectuées après trente années d'immersion marine d'éprouvettes de mortiers, de bétons et de bétons armés dans la mer du Nord à Ostende.
Campus, Ferdinand ULiege; Dantinne, Roger; Dzulynski, Monique et al

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

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See detailImportance des déformations thermo-hygrométriques du béton pour la protection des armatures.
Campus, Ferdinand ULiege

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

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See detailEssais comparatifs de gélivité de bétons de dalles de trottoir de 28 et de 17 ans d'âge.
Campus, Ferdinand ULiege; Dzulynski, Monique

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

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See detailEssais d'une poutre en béton armé âgée de 14 ans.
Baus, Raymond; Campus, Ferdinand ULiege

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

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See detailEssais sur mortier immergé dans l'eau carbo-gazeuse de Spa.
Campus, Ferdinand ULiege

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

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See detailCommentaires et conclusions.
Campus, Ferdinand ULiege

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

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See detailEssais sur les effets de l'adhérence du mortier aux agrégats
Campus, Ferdinand ULiege; Dantinne, Roger; Dzulynski, Monique et al

in Journée C.E.R.E.S sur la durabilité du béton et du béton armé (1966, September)

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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 ULiege

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 detailAnthropologie culturelle et éducation comparée
de Landsheere, Gilbert ULiege

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

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See detailDrilus flavescens Fourcroy, prédateur d'escargots : (Coléoptère, Drilidae)
Magis, Noël ULiege

in Les naturalistes belges (1966), 47(9), 457-466

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

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

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See detailEducational trends in Belgium
de Landsheere, Gilbert ULiege

in Scottish Educational Journal (1966)

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

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

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

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

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See detailTendances éducatives en Belgique
de Landsheere, Gilbert ULiege

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

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