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See detailVariational principles in fluid mechanics
Fraeijs de veubeke, Baudouin ULg

in 7e Conférence scientifique sur la Mé&canique des Fluides (1965)

This paper attemps a completely logical derivation from Hamilton's principle to a purely eulerian principle. A logical step, which departs from the procedure adopted by Lin, has been taken. Since ... [more ▼]

This paper attemps a completely logical derivation from Hamilton's principle to a purely eulerian principle. A logical step, which departs from the procedure adopted by Lin, has been taken. Since independent variations are to be taken on the velocity field, it is only natural to remove the constraints implying that the velocity is the derivative of the poarticle's position vector. This introduces a new vector multiplier enjoing a property of constant circulation along any segment fixed in the flow. This procedure yelds almost immediatly a general variational principle that can easily be specialized to the principles given by Bateman. [less ▲]

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See detailRayonnement visible et infrarouge : Soleil, étoiles, planètes comètes
Swings, Polydore ULg

in Annales d'astrophysique (1965), 28

1) Visible region. When carried on board of space vehicles telescopes can be used with their maximum theoretical resolving power, by avoiding the effects of atmosphere turbulence. As the atmospheric ... [more ▼]

1) Visible region. When carried on board of space vehicles telescopes can be used with their maximum theoretical resolving power, by avoiding the effects of atmosphere turbulence. As the atmospheric scattering is suppressed, observations of very low contrast phenomena are made easier. Closer observations of the solar system objects are made possible. 2) Infra red region. Observations taken from 30 km high are freed of most of the atmospheric absorption. But some infra red observations require the use of satellites (for example scanning of the whole sky within spectral regions). Needed observations are reviewed. [less ▲]

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See detailUne interview de W.H. Kilpatrick
de Landsheere, Gilbert ULg

in Education Nationale (L') (1965), 18

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See detailLes tests de connaissances
de Landsheere, Gilbert ULg

Book published by Editest (1965)

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See detailStructure of the cell wall of Staphylococcus aureus, strain Copenhagen. III. Further studies of the disaccharides
Tipper, Donald J.; Ghuysen, Jean-Marie ULg; Strominger, Jack L.

in Biochemistry (1965), 4(3), 468-473

Two disaccharides have previously been obtained in high yield from the cell wall of S. aureus by the use of hydrolytic enzymes. Disaccharide 1 is N-acetylglucosaminyl-N-acetylmuramic acid and disaccharide ... [more ▼]

Two disaccharides have previously been obtained in high yield from the cell wall of S. aureus by the use of hydrolytic enzymes. Disaccharide 1 is N-acetylglucosaminyl-N-acetylmuramic acid and disaccharide 2 is N-acetylglucosaminyl-N,Ogr;-diacetylmuramic acid. After hydrolysis of disaccharide 2 with β-acetylglucosaminidase, N,O-diacetylmuramic acid was prepd. Data obtained from periodate oxidn. of these compds. coupled with their susceptibility to β-acetylglucosaminidase indicate that both disaccharides are β-1,4-linked and that the O-acetyl group of disaccharide 2 is on the 6-position of N-acetylmuramic acid. The high reducing power and pos. Morgan-Elson reaction of the disaccharides are due to their unusual susceptibility to hydrolysis at alk. pH. These and other anomalous properties of the compds. are discussed. [on SciFinder(R)] [less ▲]

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See detailContributions à la biochimie du ver à soie. XXX. Biosynthèse de tréhalose et de glycogène à partir de glucose-1-phosphate
Bricteux-Grégoire, S.; Jeuniaux, Charles ULg; Florkin, Marcel ULg

in Comparative Biochemistry and Physiology (1965), 16

1. When injected into silkworms in the middle of the fifth larval instar, labelled G-1-P is principally used for the synthesis of hemolymph trehalose. 2. Glycogen synthesis from the same source in the fat ... [more ▼]

1. When injected into silkworms in the middle of the fifth larval instar, labelled G-1-P is principally used for the synthesis of hemolymph trehalose. 2. Glycogen synthesis from the same source in the fat body proceeds more rapidly in undernourished larvae than in those fed normally. 3. Owing to the poor incorporation of the radioactivity in the glycogen and especially in the trehalose of the fat body, it is suggested that the trehalose could be synthesized from pyruvate elsewhere than in the fat body, and that the biosynthetic pathway of trehalose from pyruvate does not necessarily pass through glycogen. 4. The synthesis of trehalose and glycogen, as well as the hydrolysis of glycogen, could be controlled, directly or indirectly, by the variations of the trehalose level in the hemolymph. 5. The gluconeogenetic pathways in the silkworm are discussed and presented in the form of a partially hypothetical figure. [less ▲]

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See detailNévroses expérimentales dans des conditionnements à renforcement positif
Richelle, Marc ULg

in Psychologica Belgica (1965), 5

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See detailBehavioural effects of a long-term treatment with meprobamate in cats
Xhenseval, B.; Richelle, Marc ULg

in International Journal of Neuropharmacology (1965), 4

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See detailRégulations temporelles simples chez des malades mentaux
Denys, W.; Richelle, Marc ULg

in Schweizerische Zeitschrift für Psychologie und ihre Andwendungen = Revue Suisse de Psychologie, Pure et Appliquée (1965), 24(3), 263-267

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See detailStructure of the Cell Wall of Staphylococcus Aureus, Strain Copenhagen. IV. The Teichoic Acid-Glycopeptide Complex
Ghuysen, Jean-Marie ULg; Tipper, Donald J.; Strominger, Jack L.

in Biochemistry (1965), 4

A teichoic acid-glycopeptide complex has been obtained from the cell wall of Staphylococcus aureus after enzymatic lysis of the walls with either of two acetylmuramidases. This complex was fractionated ... [more ▼]

A teichoic acid-glycopeptide complex has been obtained from the cell wall of Staphylococcus aureus after enzymatic lysis of the walls with either of two acetylmuramidases. This complex was fractionated into materials containing a glycopeptide component of varying size linked to teichoic acid. Most of the glycopeptide was removed by hydrolysis of the complexes with an acetylmuramyl-L-alanine amidase. After this treatment, a native teichoic acid with a weight-average molecular weight of about 20,000 and a number-average molecular weight of 12,000-16,000 was obtained. These data suggest that the largest molecules of the teichoic acid contain forty to fifty repeating units and that some smaller molecules also exist in the preparation. Chemical and physical analyses of native teichoic acid and various teichoic acid-glycopeptide complexes are presented. [less ▲]

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See detailSpectrographic observations of Comet Ikeya-Seki (1965f).
Dufay, J.; Swings, Polydore ULg; Fehrenbach, Charles

in Astrophysical Journal (1965), 142

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See detailEtude palynologique du Dévonien du sondage de Booischot (Belgique)
Streel, Maurice ULg

in Bulletin de la Société Belge de Géologie (1965), LXXIII(2), 159-175

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See detailTechniques de préparation des roches détritiques en vue de l'analyse palynologique quantitative.
Streel, Maurice ULg

in Annales de la Société Géologique de Belgique (1965), 88(4), 107-117

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See detailRécents résultats spatiaux par ballons stratosphériques
Zander, Rodolphe ULg

in Ciel et Terre (1965), 5-6

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See detailThe composition of the Venus clouds and implications for model atmospheres
Bottema, Murk; Plummer, William; Strong, John et al

in Journal of Geophysical Research (1965), 70(17), 4401--4402

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See detailDigestion de l'acide alginique chez les invertébrés
Franssen, J.; Jeuniaux, Charles ULg

in Cahiers de Biologie Marine (1965), 6

Alginolytic enzymes have been detected, by viscosimetric method and by analysis of hydrolytic products, in the digestive tract of Arenicola marina L. and of the Echinoderms Psammzchinus miliaris Gmelin ... [more ▼]

Alginolytic enzymes have been detected, by viscosimetric method and by analysis of hydrolytic products, in the digestive tract of Arenicola marina L. and of the Echinoderms Psammzchinus miliaris Gmelin and Hotothuria forkali della Chiaje, in the cristalline tube of Tapes decussatus L. (Lamellibranchia) and in all the 13 different species of Gastropoda so far studied. Alginase seems to be a permanent constituent of the enzymatic digestive equipement of Gastropoda, this enzyme indeed being secreted not only by phytophagous marine species, which feed on brown algae containing alginic acid, but also by carnivorous marine species and by phytophagous species terrestrial or living in fresh waters. However, a correlation appears to exist between the dietary habits and the amount of alginase in the digestive organs. In the cases so far studied, the optimum pH of alginases generally lies between 7,2 and 7,8. [less ▲]

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See detailInformations paléobotaniques sur la limite Dévonien Inférieur-Dévonien Moyen dans le géosynclinal Ardenno-Rhénan.
Streel, Maurice ULg

in Mémoires du Bureau de Recherches Géologiques et Minières (Paris) (1965), 33

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See detailComposition chimique du tube d'un pogonophore (Siboglinum SP.) et des formations squelettiques de deux pterobranches
Foucart, M.F.; Bricteux-Grégoire, S.; Jeuniaux, Charles ULg

in Sarsia. North Atlantic Marine Science (1965), 20

The chemical composition of the skeletons of two species of pterobranchs, Cephalodiscus inaequatus (Andersson) and Rhabdopleura sp. of one pogonophore, Siboglinum sp., was studied quantitatively. The ... [more ▼]

The chemical composition of the skeletons of two species of pterobranchs, Cephalodiscus inaequatus (Andersson) and Rhabdopleura sp. of one pogonophore, Siboglinum sp., was studied quantitatively. The tubes of Siboglinum sp. are composed of proteins (about 47 %) and chitin (about 33 %) ; these two substances are probably associated in large amounts as glycoproteic complexes. The amino acid composition suggests that these proteins belong to the class of scleroproteins. Their composition is very differtent from that of collagen and keratin. On the contrary, the coenecium of the two pterobranchs does not contain any chitin and the amounts of proteins are much lower (19 %). The proteins are characterized by a very high proportion of glycine (35 % of the total amount of amino acids). [less ▲]

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