All four major classes of organic insecticides are neurotoxicants. The chlori nated
hydrocarbons such as DDT, lindane, dieldrin, and toxaphene, which act on nerve …

A risk assessment of the triazine herbicide atrazine has been conducted by first analyzing
the toxicity database and subsequently estimating exposure. Margins of safety (MOS) were …

Highlights•Insect RNA interference (RNAi) pathways detect and restrict viruses.•Dicer-2
detects diverse viral dsRNA signatures and initiates the RNAi pathway.•RNAi may play a …

We report a photoluminescence study of excitons localized by interface fluctuations in a
narrow GaAs/AlGaAs quantum well. This type of structure provides a valuable system for the …

We report coherent optical control of a biexciton (two electron-hole pairs), confined in a
single quantum dot, that shows coherent oscillations similar to the excited-state Rabi …

Transient nonlinear optical spectroscopy, performed on excitons confined to single GaAs
quantum dots, shows oscillations that are analogous to Rabi oscillations in two-level atomic …

Picosecond optical excitation was used to coherently control the excitation in a single
quantum dot on a time scale that is short compared with the time scale for loss of quantum …

The homogeneous linewidths in the photoluminescence excitation spectrum of a single,
naturally formed gallium arsenide (GaAs) quantum dot have been measured with high …

Low-temperature electron-spin relaxation is studied by the optical orientation method in bulk
n-GaAs with donor concentrations from 10 14 cm− 3 to 5× 10 17 cm− 3. A peculiarity related …

We present a comprehensive examination of optical pumping of spins in individual GaAs
quantum dots as we change the net charge from positive to neutral to negative with a charge …