Zobrazeno 1 - 10
of 333
pro vyhledávání: '"Schiessel H"'
We calculate the equation of state of DNA under tension for the case that the DNA features loops. Such loops occur transiently during DNA condensation in the presence of multivalent ions or sliding cationic protein linkers. The force-extension relati
Externí odkaz:
http://arxiv.org/abs/q-bio/0509003
We derive the single molecule equation of state (force-extension relation) for DNA molecules bearing sliding loops and deflection defects. Analytical results are obtained in the large force limit by employing an analogy with instantons in quantum mec
Externí odkaz:
http://arxiv.org/abs/cond-mat/0501379
Histone octamers show a heat-induced mobility along DNA. Recent theoretical studies have established two mechanisms that are qualitatively and quantitatively compatible with in vitro experiments on nucleosome sliding: Octamer repositiong through one-
Externí odkaz:
http://arxiv.org/abs/q-bio/0406037
Autor:
Kulic, I. M., Schiessel, H.
DNA-spools, structures in which DNA is wrapped and helically coiled onto itself or onto a protein core are ubiquitous in nature. We develop a general theory describing the non-equilibrium behavior of DNA-spools under linear tension. Two puzzling and
Externí odkaz:
http://arxiv.org/abs/cond-mat/0306432
Autor:
Kulic, I. M., Schiessel, H.
We study the spontaneous ''sliding'' of histone spools (nucleosomes) along DNA as a result of thermally activated single base pair twist defects. To this end we map the system onto a suitably extended Frenkel-Kontorova model. Combining results from s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0302188
Autor:
Tamashiro, M. N., Schiessel, H.
We perform a linearization of the Poisson-Boltzmann (PB) density functional for spherical Wigner-Seitz cells that yields Debye-H\"uckel-like equations agreeing asymptotically with the PB results in the weak-coupling (high-temperature) limit. Both the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0210245
Autor:
Tamashiro, M. N., Schiessel, H.
The classical problem of two uniformly charged infinite planes in electrochemical equilibrium with an infinite monovalent salt reservoir is solved exactly at the mean-field nonlinear Poisson-Boltzmann (PB) level, including an explicit expression of t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0210246
Autor:
Kulic, I. M., Schiessel, H.
Active (catalysed) and passive (intrinsic) nucleosome repositioning is known to be a crucial event during the transcriptional activation of certain eucaryotic genes. Here we consider theoretically the intrinsic mechanism and study in detail the energ
Externí odkaz:
http://arxiv.org/abs/physics/0206084
We study long-range morphological changes in atomic monolayers on solid substrates induced by different types of defects; e.g., by monoatomic steps in the surface, or by the tip of an atomic force microscope (AFM), placed at some distance above the s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0206141
We consider the complexation of highly charged semiflexible polyelectrolytes with oppositely charged macroions. On the basis of scaling arguments we discuss how the resulting complexes depend on the persistence length of the polyelectrolyte, the salt
Externí odkaz:
http://arxiv.org/abs/cond-mat/0106352