The transverse polarization in a plane perpendicular to the nuclear spin axis has been determined for electrons emitted in the b decay of polarized Li. Such a spin component signals a violation of time reversal symmetry. Using a sample of Li nuclei with vector polarization of ;0.11 and a polarimeter with average analyzing power S520.10, the asymmetry in the Mott scattering of decay electrons wa...

Although the crystallographic structure of the bacterial porin OmpF has been known for a decade, the physical mechanisms of its ionic selectivity are still under investigation. We address this issue in a series of experiments with varied pH, salt concentrations, inverted salt gradient, and charged and uncharged lipids. Measuring reversal potential, we show that OmpF selectivity (traditionally r...

The structures of two crystals have been solved using a new iterative phasing method. The iterative phasing algorithm is developed from the 'charge-flipping' method proposed by Oszlányi & Süto [Acta Cryst. (2004), A60, 134-141]. Positivity and point-atom constraints are incorporated within this extremely simple and effective algorithm by flipping (sign reversal) of less-positive density values ...

We present magnetoresistive organic field-effect transistors featuring ultrasmall magnetic field-effects as well as a sign reversal. The employed material systems are coevaporated thin films with different compositions consisting of the electron donor 2,2',7,7'-tetrakis-(N,N-di-p-methylphenylamino)-9,9'-spirobifluorene (Spiro-TTB) and the electron acceptor 1,4,5,8,9,12-hexaazatriphenylene hexac...

A theory is proposed which allows us to self-consistently calculate the effective colloidal charge and the counterion and coion density profiles in suspensions containing both multivalent and monovalent electrolytes. The formation of counterion-coion clusters is explicitly taken into account. The theory predicts that sufficiently strongly charged colloidal particles will become overcharged. The...

We investigate a double-layer of penetrable ions near a charged wall. We find a new mechanism for charge reversal that occurs in the weak-coupling regime and, accordingly, the system is suitable for the mean-field analysis. The penetrability is achieved by smearing-out the ionic charge inside a sphere, so there is no need to introduce non-electrostatic forces and the system in the low coupling ...

A number of anticancer drugs, such as doxorubicin (DOX), operate only after being transported into the nucleus of cancer cells. Thus it is essential for the drug carriers to effectively release the anticancer drugs into the cytoplasm of cancer cells and make them move to nucleus freely. Herein, a pH-responsive charge-reversal polyelectrolyte and integrin αⅤβ3 mono-antibody functionalized graphe...

We investigate the problem of the superuniversality of the phase transition between different quantum Hall plateaus. We construct a set of models which give a qualitative description of this transition in a pure system of interacting charged particles. One of the models is manifestly invariant under both Duality and Periodic shifts of the statistical angle and, hence, it has a full Modular Inva...

We investigate the problem of the superuniversality of the phase transition between different quantum Hall plateaus. We construct a set of models which give a qualitative description of this transition in a pure system of interacting charged particles. One of the models is manifestly invariant under both Duality and Periodic shifts of the statistical angle and, hence, it has a full Modular Inva...

In this paper we brie y review the main aspects of a recent pro posal to simulate semiclassical corrections to classical dynamics by suitable classical stochastic uctuations and we apply it to the spe ci c instance of charged beams in particle accelerators The resulting picture is that the collective beam dynamics at the leading semiclassi cal order in Planck constant can be described by a part...