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.
The amino acid L-glutamate is now recognized as the major excitatory neurotransmitter in the central nervous system (CNS). Accumulating evidence suggests that the glutamate system is involved not just in fast synaptic transmission, but also in plasticity and higher cognitive functions.he amino acid L-glutamate is now recognized as the major excitatory neurotransmitter in the central nervous system (CNS). Accumulating evidence suggests that the glutamate system is involved not just in fast synaptic transmission, but also in plasticity and higher cognitive functions.