Human African trypanosomiasis or sleeping sickness is a deadly disease endemic in sub-Saharan Africa, caused by single-celled protozoan parasites. Although it has been targeted for elimination by 2020, this will only be realized if diagnosis can be improved to enable identification and treatment of afflicted patients. Existing techniques of detection are restricted by their limited field-applic...

Abstract Over seventy years ago, Niels Bohr described how the charge state of an atomic ion moving through a solid changes dynamically as result electron capture and loss processes, eventually resulting in equilibrium state. Although obvious, this process has so far eluded direct experimental observation. By peeling solid, such graphite, layer by layer, studying transmission highly charged ions...

A key structure in so-called metamaterial mediums is the elementary split-ring resonator. We consider in this paper the lowfrequency electromagnetic scattering by a split-ring particle modelled as a perfectly conducting wire ring, furnished with a narrow gap, and derive analytical solutions for the electric and magnetic dipole moments for different kinds of incidence and polarisation in the qua...

The ultrasonic velocity, density and refractive indices have been measured for systems at 303.15, 308.15, 313.15, 318.15 and 323.15 K. From the experimental data adiabatic compressibility (βs), intermolecular free length (L f ), internal pressure (π), acoustic impedance (Z), molar refraction (Rm), Polarisability, (αp), thermal expansion coefficient (α), Rao’s molar sound function (R), solvation...

The calculated properties of substituted carboranes such as dipole moment, polarisability, the magnitude of the σ-hole and the desolvation free energy are compared with these properties in comparable aromatic and cyclic aliphatic organic compounds. Dispersion and charge transfer energies are similar. However, the predicted strength of the halogen bonds with the same electron donor (based on the...

0009-2614/$ see front matter 2011 Elsevier B.V. A doi:10.1016/j.cplett.2011.03.013 ⇑ Corresponding author at: Departamento de Quími Ciências, Universidade de Lisboa, 1749-016 Lisboa, Po E-mail address: [email protected] (B.J.C. Cabral). Electronic properties of a methane–water solution were investigated by a sequential quantum mechanical/molecular dynamics approach. Upon hydration methane acquir...

Vertically coupled Stranski Krastanow QDs are predicted to exhibit strong tunnelling interactions that lead to the formation of hybridised states. We report the results of investigations into single pairs of coupled QDs in the presence of an electric field that is able to bring individual carrier levels into resonance and to investigate the Stark shift properties of the excitons present. Pronou...

The effect of an electric field on a dilute suspension of asymmetric colloidal particles is to impose rotational order which can be detected as an induced birefringence in the sol. Furthermore, · if the particles are charged, such rotation is followed by electrophoretic translation. In a single apparatus, pulsed electric fields have been applied to sols of the rod-like clay mineral attapulgite,...