Pyrazine: Supercollisions or simple reactions?

SYNTHESES AND REACTIONS OF PYRAZINE AND QUINOXALINE 1.1 Pyrazine

Putaminal activity for simple reactions or self-timed movements.

To examine the role of basal ganglia-cortical circuits in movement initiation, we trained monkeys to make the same arm movements in two ways-in immediate reaction to a randomly timed external cue (cued movements) and also following a variable delay without an explicit initiation signal (self-timed movements). The two movement types were interleaved and balanced in overall timing to allow a dire...

Luminescent materials incorporating pyrazine or quinoxaline moieties

Though the past few decades, the development of new luminescent materials has received a lot of attention due to their applications as fluorescent sensors, in biological microscopy and in optoelectronic devices. Most of these applications are relied on intramolecular charge transfer (ICT). Presence of electron withdrawing N-heterocycles such as pyrazine and quinoxaline rings appeared therefore ...

Symmetry-Breaking Supercollisions in Landau-Quantized Graphene.

Recent pump-probe experiments performed on graphene in a perpendicular magnetic field have revealed carrier relaxation times ranging from picoseconds to nanoseconds depending on the quality of the sample. To explain this surprising behavior, we propose a novel symmetry-breaking defect-assisted relaxation channel. This enables scattering of electrons with single out-of-plane phonons, which drast...

Serological Reactions with Simple Chemical Compounds (precipitin Reactions)

Experiments are described demonstrating the precipitation of azodyes by immune sera prepared by the injection of azoproteins containing the same azo component. These precipitin reactions prove conclusively the view already advanced on the basis of inhibition reactions that antibodies combine specifically with substances of small molecular weight. Although in this respect both phenomena have the...