Hysteresis in DNA compaction by Dps is described by an Ising model.

Delft University of Technology Hysteresis in DNA compaction by Dps is described by an ising model

Memory effects in the relaxation of Ising models

– It is analytically shown that the one-dimensional Ising model with Glauber dynamics exhibits short time memory effects when submitted to an abrupt change in the temperature. These effects are qualitatively similar to those experimentally observed in the compaction of vibrated granular materials. Moreover, a critical time separating regimes of “normal” and “anomalous” responses to the perturba...

Dps Is a Stationary Phase-Specific Protein of Escherichia coli Nucleoid

Bacterial genomic DNA is highly organized into one or few compacted bodies known as nucleoid, which is composed of DNA, RNA and several DNA-binding proteins. These DNA-binding proteins require essential alterations in their expression during stationary phase of growth in order to respond to stressful environmental conditions. Dps (DNA-binding protein from starved cells) is one of such DNA-bindi...

Microscopic foundations of the Rayleigh law of hysteresis

The hysteresis properties of ferromagnetic materials at low field are described by the Rayleigh law. We analyze the problem in the light of modern statistical mechanics models of hysteresis. In particular, we compute the demagnetization curve and derive the Rayleigh parameters a and b in the random-field Ising model and in a model of domain wall depinning. In the random-field Ising model the Ra...

Disorder-induced critical phenomena in hysteresis: Numerical scaling in three and higher dimensions

We present numerical simulations of avalanches and critical phenomena associated with hysteresis loops, modeled using the zero-temperature random-field Ising model. We study the transition between smooth hysteresis loops and loops with a sharp jump in the magnetization, as the disorder in our model is decreased. In a large region near the critical point, we find scaling and critical phenomena, ...