Exciton Binding Energies in Conjugated Polyelectrolyte Films

Molecular design: The electronic structure of conjugated polyelectrolytes as a function of ionization potential (IP) and electron affinity (EA) is determined using X‐ray absorption and emission spectroscopy (see figure). Different functional groups give rise to dissimilar transport gaps and exciton binding energies.

     

Antimicrobial peptides in action

Molecular dynamics simulations of the magainin MG-H2 peptide interacting with a model phospholipid membrane have been used to investigate the mechanism by which antimicrobial peptides act. Multiple copies of the peptide were randomly placed in solution close to the membrane. The peptide readily bound to the membrane, and above a certain concentration, the peptide was observed to cooperatively induce the formation of a nanometer-sized, toroidally shaped pore in the bilayer. In sharp contrast with the commonly accepted model of a toroidal pore, only one peptide was typically found near the center of the pore. The remaining peptides lay close to the edge of the pore, maintaining a predominantly parallel orientation with respect to the membrane.     

Photophysical and biological investigation of novel luminescent Ru(II)-polypyridyl-1,8-naphthalimide Tröger's bases as cellular imaging agents

The synthesis and photophysical properties of 1 and 2, two Ru(II)-polypyridyl based-1,8-naphthalimide Tr?ger's bases, are described; these were found to stabilize double stranded DNA, undergo rapid cellular uptake, displaying good luminescence without affecting cell viability even after 24 hours of incubation.     

The temperature-jump problem based on the CES model of the linearized Boltzmann equation

An analytical discrete-ordinates method is used to solve the temperature-jump problem as defined by a synthetic-kernel model of the linearized Boltzmann equation. In particular, the temperature and density perturbations and the temperature-jump coefficient defined by the CES model equation are obtained (essentially) analytically in terms of a modern version of the discrete-ordinates method. The developed algorithms are implemented for general values of the accommodation coefficient to yield numerical results that compare well with solutions derived from more computationally intensive techniques.     

The temperature-jump problem based on the CES model of the linearized Boltzmann equation

An analytical discrete-ordinates method is used to solve the temperature-jump problem as defined by a synthetic-kernel model of the linearized Boltzmann equation. In particular, the temperature and density perturbations and the temperature-jump coefficient defined by the CES model equation are obtained (essentially) analytically in terms of a modern version of the discrete-ordinates method. The developed algorithms are implemented for general values of the accommodation coefficient to yield numerical results that compare well with solutions derived from more computationally intensive techniques.     

On computing the Chapman-Enskog and Burnett functions

An expansion and projection technique based on Legendre polynomials is used to solve, in an efficient and accurate way, the Chapman-Enskog equations for viscosity and heat transfer and to compute the Burnett functions required, for example, for Poiseuille-flow problems based on rigid-sphere collisions and the linearized Boltzmann equation.     

Eisen und Stahl

Ohne Zusammenfassung     

A generalized spherical harmonics solution basic to the scattering of polarized light

A generalized spherical harmonics solution for the azimuthally symmetric component of a Fourier representation of the vector of Stokes parameters basic to the scattering of polarized light in a plane-parallel layer is reported. The final result is continuous in both independent variables and is valid for a general class of scattering matrices. Computational aspects of the developed solution are discussed, and numerical results for the relevant Stokes vector are given for several realistic cases.

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Zusammenfassung Es wird über eine verallgemeinerte Lösung in Kugelfunktionen berichtet für die azimutalsymmetrische Komponente der Fourier-Darstellung eines Vektors von Stokes-Parametern, die für die Theorie der Streuung von polarisiertem Licht in ebenen parallelen Schichten grundlegend ist. Das Endresultat ist kontinuierlich in beiden unabhängigen Veränderlichen und ist für eine allgemeine Klasse von Streumatrizen gültig. Rechnerische Aspekte der gewonnenen Lösung wurden diskutiert, und numerische Lösungen für den relevanten Stokes-Vektor werden für verschiedene realistische Fälle angegeben.

     

An analytical view of ionic liquids

Within the last decade, ionic liquids have come to the fore as environmentally-responsible designer solvents. But what are ionic liquids and what can they offer the analytical scientist? This article addresses these questions and chronicles recent progress made in the application of ionic liquids toward analytical problem-solving. While further progress is required before ionic liquids become mainstream analytical solvents, results to date commend their use in various modes of chemical analysis. It is our aim that the findings reported herein draw other researchers into this area and encourage the increased application of ionic liquids in this manner.