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Showing 1 to 12 of 47 entries
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Template-Mediated Stabilization of a DNA G-Quadruplex formed in the HIV-1 Promoter and Comparative Binding Studies.

Chemistry (Weinheim an der Bergstrasse, Germany)

Bonnat L, Bar L, Génnaro B, Bonnet H, Jarjayes O, Thomas F, Dejeu J, Defrancq E, Lavergne T.
PMID: 28264144
Chemistry. 2017 Apr 24;23(23):5602-5613. doi: 10.1002/chem.201700417. Epub 2017 Apr 05.

G-rich DNA oligonucleotides derived from the promoter region of the HIV-1 long terminal repeat (LTR) were assembled onto an addressable cyclopeptide platform through sequential oxime ligation, a thiol-iodoacetamide SN2 reaction, and copper-catalyzed azide-alkyne cycloaddition reactions. The resulting conjugate was...

Two-stage surface freezing of a single top layer in a smectic-A membrane.

Physical review. E, Statistical, nonlinear, and soft matter physics

de Jeu WH, Fera A, Konovalov O, Ostrovskii BI.
PMID: 12636645
Phys Rev E Stat Nonlin Soft Matter Phys. 2003 Feb;67(2):020701. doi: 10.1103/PhysRevE.67.020701. Epub 2003 Feb 06.

The crystallization of a single liquid top layer of smectic membranes of the compound 4O.8 has been studied with grazing-incidence x-ray diffraction. As this process takes place in two steps, involving an intermediate hexatic smectic-B layer before the final...

Observation of a prewetting transition during surface melting of caprolactam.

Physical review letters

Chandavarkar S, de Jeu WH, Geertman RM.
PMID: 10046471
Phys Rev Lett. 1992 Oct 19;69(16):2384-2387. doi: 10.1103/PhysRevLett.69.2384.

No abstract available.

3D XY behavior of a nematic-smectic-A phase transition: Confirmation of the de Gennes model.

Physical review letters

Bouwman WG, de Jeu WH.
PMID: 10045996
Phys Rev Lett. 1992 Feb 10;68(6):800-803. doi: 10.1103/PhysRevLett.68.800.

No abstract available.

Layer-by-layer crystallization and the role of fluctuations in free standing smectic films.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics

Fera A, Ostrovskii BI, Sentenac D, Samoilenko I, de Jeu WH.
PMID: 11970449
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 1999 Nov;60(5):R5033-6. doi: 10.1103/physreve.60.r5033.

Specular x-ray reflectivity has been used to study the changes in the thermal fluctuation behavior of eight layer freely suspended N-(4-n-butoxybenzilidene)-4-n-octylaniline (4O.8) films during the process of successive layer-by-layer crystallizations. Each of these steps is preceded by the formation...

Complex dynamic behavior of fluctuating smectic- A films as studied by scattering with coherent X-rays.

Physical review letters

Fera A, Dolbnya IP, Grubel G, Muller HG, Ostrovskii BI, Shalaginov AN, de Jeu WH.
PMID: 10977999
Phys Rev Lett. 2000 Sep 11;85(11):2316-9. doi: 10.1103/PhysRevLett.85.2316.

Coherent dynamic x-ray scattering has been used to study the thermally excited layer fluctuations in freely suspended smectic films of the compound 4O.8. Using 8-keV x rays and films with a thickness around 0.3 &mgr;m we resolve relaxation times...

Surface and bulk elasticity determined fluctuation regimes in smectic membranes.

Physical review letters

Sikharulidze I, Farago B, Dolbnya IP, Madsen A, De Jeu WH.
PMID: 14611413
Phys Rev Lett. 2003 Oct 17;91(16):165504. doi: 10.1103/PhysRevLett.91.165504. Epub 2003 Oct 17.

We report combined x-ray photon correlation spectroscopy (XPCS) and neutron spin echo (NSE) measurements of the layer-displacement fluctuations in smectic liquid-crystal membranes in the range from 10 ns to 10 micros. NSE reveals a new regime, determined by bulk...

Disorder by random crosslinking in smectic elastomers.

Physical review letters

Lambreva DM, Ostrovskii BI, Finkelmann H, de Jeu WH.
PMID: 15525180
Phys Rev Lett. 2004 Oct 29;93(18):185702. doi: 10.1103/PhysRevLett.93.185702. Epub 2004 Oct 26.

We present a high-resolution x-ray study of the effects of disorder due to random crosslinking on the one-dimensional translational ordering in smectic elastomers. At a small crosslink density of about 5%, the elastomer network stabilizes the smectic structure against...

Self-assembly of the perfluoroalkyl-alkane F14H20 in ultrathin films.

Langmuir : the ACS journal of surfaces and colloids

Mourran A, Tartsch B, Gallyamov M, Magonov S, Lambreva D, Ostrovskii BI, Dolbnya IP, de Jeu WH, Moeller M.
PMID: 15752020
Langmuir. 2005 Mar 15;21(6):2308-16. doi: 10.1021/la048069y.

Scanning force microscopy on monomolecular films of eicosylperfluorotetradecane, F(CF(2))(14)(CH(2))(20)H, on mica, silicon oxide, or water revealed spontaneous organization to well-defined nanoscopic ribbon and spiral or toroidal superstructures. Whether ribbons or nanospirals were formed depended on the solvent from which...

Nonanoic Acid, a Fungal Self-Inhibitor, Prevents Germination of Rhizopus oligosporus Sporangiospores by Dissipation of the pH Gradient.

Applied and environmental microbiology

Breeuwer P, De Reu JC, Drocourt J, Rombouts FM, Abee T.
PMID: 16535482
Appl Environ Microbiol. 1997 Jan;63(1):178-85. doi: 10.1128/aem.63.1.178-185.1997.

Germination of Rhizopus oligosporus sporangiospores is characterized by swelling of the spores and subsequent emergence of germ tubes. Changes in spore morphology and alterations in intracellular pH (pH(infin)) of the sporangiospores were assessed during the germination process by flow...

Lyomesophases of C3-symmetrical bipyridine-based discs in alkanes: an X-ray diffraction study.

Langmuir : the ACS journal of surfaces and colloids

Martín-Rapún R, Byelov D, Palmans AR, de Jeu WH, Meijer EW.
PMID: 20050050
Langmuir. 2009 Aug 04;25(15):8794-801. doi: 10.1021/la9003017.

The importance of the role of alkane solvents in the self-assembly process of pi-conjugated molecules is well recognized but hardly understood. Here we present our results on the X-ray diffraction studies that we conducted to gain insight into the...

Dynamic heterogeneity in hydrogen-bonded polymers.

Physical review. E, Statistical, nonlinear, and soft matter physics

Muresan AS, Dubbeldam JL, Kautz H, Monkenbusch M, Sijbesma RP, van der Schoot P, de Jeu WH.
PMID: 17025660
Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Sep;74(3):031804. doi: 10.1103/PhysRevE.74.031804. Epub 2006 Sep 21.

We report on neutron spin echo experiments on hydrogen-bonded polymers and compare the experimentally found dynamical structure factor with theoretical predictions. Surprisingly, we find that in the melt phase the expected scaling of the Rouse dynamics is not satisfied....

Showing 1 to 12 of 47 entries