360 research outputs found
[Putzi. Mise en scène de Francis Huster : photographies / Daniel Cande]
No full textAppartient à l’ensemble documentaire : PhoSpec
[Le misanthrope. Mise en scène de Francis Huster : photographies / Daniel Cande]
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[Richard de Gloucester, texte et mise en scène de Francis Huster : photographies / Daniel Cande]
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[Faisons un rêve. Mise en scène de Francis Huster : photographies / Daniel Cande]
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Pseudopeptides designed to form supramolecular helixes: The role of the stereogenic centers
No full textThe two epimers Boc-L-Phe-D-Oxd-(S)-Î23-hPhg-OBn (1) and Boc-L-Phe-D-Oxd-(R)-Î23-hPhg-OBn (2) have been prepared by standard methods in solution, and their conformation was analyzed both in solution and in the solid state. While in solution 1 shows a random coil structure, 2 tends to assume a Î3-turn conformation that is nearly retained in the solid state. On the other hand, in the solid state molecules of 1 associate generating a helix that involves the formation of elongated crystals with hexagonal cross-section. This effect is not observed in the crystals formed by Boc-L-Phe-D-Oxd-(R)-Î23-hPhg-OBn 2. © 2009 American Chemical Society
[Le Cid, texte de Pierre Corneille : photographies / Daniel Cande]
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[Lorenzaccio, texte d'Alfred de Musset : photographies / Daniel Cande]
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[La peste, texte d'après Albert Camus : photographies / Daniel Cande]
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Nanofibers from oxazolidi-2-one containing hybrid foldamers: what is the right molecular size?
No full textA series of oligomers of the type Boc-(L-Phe-D-Oxd)n-OBn (Boc = tert-butoxycarbonyl; Oxd = 4-methyl-5carboxy oxazolidin-2-one; Bn = benzyl) were prepared for n = 2-5. The shortest oligomer, Boc-(L-Phe-D-Oxd)2-OBn, aggregates and forms a fiber-like material with an anti-parallel β-sheet struc- ture in which the oligopeptide units are connected to each other by only one intermolecular hydrogen bond. The longer oligomers exhibit structural heterogeneity. They start to organize into secondary structures by the formation of intramolecular hydrogen bonds at the pentamer level. Microscopy and diffraction of the oligomers indicated a crystalline character for only the shorter ones. © 2009 Wiley-VCH Verlag GmbH & Co
Characterization of lipid bilayers adsorbed on spherical LbL-support
No full textStructural and dynamic properties of membranes composed of phosphatidylcholine (PC) and phosphatidylserine (PS) on layer-by-layer (LbL) polyelectrolyte coated particles were investigated using solid-state nuclear magnetic resonance (NMR) and fluorescence methods. These spherically supported membranes showed structural, dynamic, and elastic properties similar to free-standing membranes as proved by 31P and 2H NMR. Small differences between behaviour of PC and PS on LbL support due to interaction with the polyelectrolyte were observed. Fluorescence lifetime imaging microscopy (FLIM) using 7-nitro-2-1,3-benzoxadiazol (NBD) labeled PC and PS showed a stronger impact of the outermost polyelectrolyte (PAH) on the fluorescence lifetimes of NBD-PS compared to NBD-PC. Although small defects in nm range allowing passage of Mn2+ to both layers of the membrane coat were present, a rather homogeneous coating observed by fluorescence microscopy, complete fluorescence recovery after photobleaching, and NMR results reveal that somewhat continuous lipid bilayers were formed around the LbL particles<br/
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