Ladies and Gentlemen, dear guests, It is my great pleasure and privilege to extend our heartiest wel come to you, the participants of this 33rd Nobel symposium. To those of you who have not attended a Nobel symposium before I would like just briefly to explain why Nobel's name is linked to this series of symposia. Alfred Nobel, who died in San Remo in 1896, donated the main part of his fortune to the promotion of in ternational science and culture by establishing annual prizes for outstanding discoveries or contributions within five fields, che mistry, physics, physiology or medicine,...