Therefore, if you're planning a long journey, you should always apply for the Russian visa before you leave. It's possible to get a tourist visa support at any moment before your journey, however, you can only apply for a tourist visa not earlier than 90 days before the date of your first entry to Russia.
Serotonin is a common neuromediator in the brain. It belongs to the group of so-called biogenic amines, relatively simple chemicals that facilitate the transfer of signals between the cells of the body.
The Effect of Drugs on Serotonin. The Effect of Drugs on Serotonin. When a person uses a drug, he will experience several side effects. These effects include both physical and psychological changes, and can be either short-term or long-lasting. Some of the most pronounced effects of drug use, though, appear in the brain.