Acknowledgements

I would like to thank

• my supervisor Martin Billeter for having introduced me to scientific work,
• all people in the NMR group for showing sincere interest in the project and organizing NMR lunches,
• my far living friends Aiste and Erik for interesting e-mail discussions seldom relating to science and support when things went wrong,
• my near-living friend Helena for constant encouragement and curiosity.

Still, my greatest thank you is for my parents Aron and Nijole, who patiently waited and actively participated in this work, who were eager to know about every advancement and were continuously encouraging to go further.