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Nowadays, people talk about "Internet revolution". About 35 million internet users

communicate now and then. This can be compared with the 100 billion nerve cells within ourselves that communicate continuously. The Nobel Prize of the year 2000 in physiology or medicine was awarded to Carlsson, Greengard and Kandel1 for their groundbreaking work on "signal transduction in the nerve systems".

Loewi2 has done a pioneer work on neurotransmitter (NTs) and neurotransmission. In 1903, he put a hypothesis saying that, the nerve endings could contain chemical substances, which would be released by the nerve terminals upon stimulation, so that these substances in their turn would stimulate the effective organ. The idea for the crucial experiment occurred to him in a dream in 1920, is quoted in his own words as "The night before Easter Sunday of that year I awoke, turned on the light and jotted down a few notes on a tiny slip of thin paper. Then I felt asleep again. It occurred to me at six o'clock in the morning that I had written down something most important, but I was unable to decipher the scrawl. The next night, at three o'clock the idea returned. It was the design of an experiment to determine whether or not the hypothesis of chemical transmission that I had uttered seventeen years ago was correct. I got up immediately, went to the laboratory, and performed a simple experiment on a frog heart according to the nocturnal design." These results unequivocally proved that, the nerves do not influence the heart directly but liberate from their terminals (specific chemical substances). which in turn, cause the well-known modification of the function of the heart characteristic of the stimulation of the heart.