Little is known about the simultaneous uptake of different engineered nanoparticle types, as it can be expected in our daily life. In order to test such co-exposure effects, murine macrophages (J774A.1 cell line) were incubated with gold (AuNPs) and iron oxide nanoparticles (FeO x NPs) either alone or combined. Environmental scanning electron microscopy revealed that single NPs of both types bo...

Reactions of neutral iron oxide clusters (Fe(m)O(n), m=1-2, n=0-5) with methanol (CH(3)OH) in a fast flow reactor are investigated by time of flight mass spectrometry. Detection of the neutral iron oxide cluster distribution and reaction intermediates and products is accomplished through single photon ionization by a 118 nm (10.5 eV) VUV laser. Partially deuterated methanol (CD(3)OH) is employe...

anomaly that coincides with the SPA interioris exposed in the eastern and southeastern portion of this basin. This FeOenriched signature is interpreted to represent SPA-derived material, and samples collected within this region may be analyzed to determine the age of the oldest basin preserved on the Moon. Red and pink pixels indicate the presence of pyroxene and plagioclase [10], a signature t...

Multiferroic materials, which offer the possibility of manipulating the magnetic state by an electric field or vice versa, are of great current interest. However, single-phase materials with such cross-coupling properties at room temperature exist rarely in nature; new design of nano-engineered thin films with a strong magneto-electric coupling is a fundamental challenge. Here we demonstrate a ...

In the presence of nitrous oxide, Fe-ZSM-5 is known to catalyze the partial oxidation of benzene to phenol with high selectivity. The active site for this reaction is thought to be a surface iron–oxo species generated upon dissociation of nitrous oxide and release of nitrogen. In this study, density functional theory calculations were used to explore possible pathways for benzene oxidation at a...

MANY ANIMALS HAVE EVOLVED the ability to anticipate periodic food availability. In mammals, this ability is due to a circadian clock that still functions after ablation of the suprachiasmatic nucleus (SCN), although such lesions abolish (or severely disrupt) virtually all circadian rhythms in behavior and physiology when food is available ad libitum. Restriction of meals to a certain time of da...

It is widely accepted that atmospheric pO2 < 1 ppm before the Great Oxidation Event. Yet a recent study found fossil micrometeorites (MMs) containing oxidized iron species wüstite (FeO) and magnetite (Fe3O4) formed 2.7 billion years ago (Ga). How these MMs became uncertain. Abundant O2 in upper atmosphere oxidation by CO2 have been suggested. However, photochemical reactions cannot produce suff...

The contribution of iron transporter systems encoded by feo genes to the pathogenic traits of streptococci is largely unknown, despite the fact that those systems are required for the full virulence of several gram-negative bacterial species. In this work, we show that the swine pathogen and zoonotic agent Streptococcus suis has a feoAB operon similar to that encoding an iron transporter system...