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.
Gamma amino butyric acid (GABA) is the major inhibitory neurotransmitter in the brain, derived from glucose, which is transaminated in the Krebâ s cycle to glutamine and then converted to GABA by the enzyme, glutamic acid decarboxylase.lutamate is the major excitatory neurotransmitter and is distributed in all regions of the brain. Aspartate is closely related to glutamate and the two amino acids are often found together at axon terminals.