The pH-induced swelling and collapse atom transfer radical polymerization
SOFT MATTER 2:12 (2006) 1076-1080
Lifshitz interaction between dielectric bodies of arbitrary geometry.
Phys Rev Lett 95:23 (2005) 230601
Abstract:
A formulation is developed for the calculation of the electromagnetic-fluctuation forces for dielectric objects of arbitrary geometry at small separations, as a perturbative expansion in the dielectric contrast. The resulting Lifshitz energy automatically takes on the form of a series expansion of the different many-body contributions. The formulation has the advantage that the divergent contributions can be readily determined and subtracted off, and thus makes a convenient scheme for realistic numerical calculations, which could be useful in designing nanoscale mechanical devices.Orientational ordering and dynamics of rodlike polyelectrolytes.
Phys Rev E Stat Nonlin Soft Matter Phys 72:1 Pt 1 (2005) 011805
Abstract:
The interplay between electrostatic interactions and orientational correlations is studied for a model system of charged rods positioned on a chain, using Monte Carlo simulation techniques. It is shown that the coupling brings about the notion of electrostatic frustration, which in turn results in: (i) a rich variety of orientational orderings such as chiral phases, and (ii) an inherently slow dynamics characterized by stretched-exponential behavior in the relaxation functions of the system.Elastic correlations in nucleosomal DNA structure.
Phys Rev Lett 94:23 (2005) 238102
Abstract:
The structure of DNA in the nucleosome core particle is studied using an elastic model that incorporates anisotropy in the bending energetics and twist-bend coupling. Using the experimentally determined structure of nucleosomal DNA [T. J. Richmond and C. A. Davey, Nature (London) 423, 145 (2003)], it is shown that elastic correlations exist between twist, roll, tilt, and stretching of DNA, as well as the distance between phosphate groups. The twist-bend coupling term is shown to be able to capture these correlations to a large extent, and a fit to the experimental data yields a new estimate of G = 25 nm for the value of the twist-bend coupling constant.Propulsion of a molecular machine by asymmetric distribution of reaction products.
Phys Rev Lett 94:22 (2005) 220801