The atmosphere is quite dusty, giving the Martian sky a light brown or orange-red color when seen from the surface; data from the Mars Exploration Rovers indicate that suspended dust particles of roughly 1.5 micrometres diameter.
Glutamate is a powerful excitatory neurotransmitter that is released by nerve cells in the brain. It is responsible for sending signals between nerve cells, and under normal conditions it plays an important role in learning and memory.
Glutamate is the principal excitatory neurotransmitter in mammalian brain and has long been implicated in the generation of epileptic discharges. Administration of glutamate or glutamate analogues to experimental animals can elicit seizures, whereas glutamate antagonists are both anticonvulsant and neuroprotective (1).