Part I§§1. Structure and General Properties of Flavins§§Ana Maria Edwards§§2. Recent advances in Riboflavin Biosynthesis§§Ilka Haase, Tobias Gräwert, Boris Illarionov, Adelbert Bacher and Markus Fischer§§3. Natural Riboflavin Analogs§§Danielle Biscaro Pedrolli, Frank Jankowitsch, Julia Schwarz, Simone Langer, Shinobu Nakanishi and Matthias Mack§§4. A Roadmap to the Isotopolog Space of Flavocoenzymes§§Adelbert Bacher, Boris Illarionov, Wolfgang Eisenreich and Markus Fischer§§5. Electron Transferases§§Patricia Ferreira, Marta Martínez-Júlvez and Milagros Medina§§6. Aldonolactone Oxidoreductases§§Nicole G.H. Leferink and Willem J.H. van Berkel§§7. Flavins and Flavoproteins: Applications in Medicine§§Esther Jortzik, Lihui Wang, Jipeng Ma and Katja Becker§§Part II§§8. Practical Aspects on the Use of Kinetic Isotope Effects as Probes of Flavoprotein Enzyme Mechanisms§§Christopher R. Pudney, Sam Hay and Nigel S. Scrutton§§9. On the in vivo Redox State of Flavin-Containing Photosensory Receptor Proteins§§Aleksandra Bury and Klaas J. Hellingwerf§§10. Computational Spectroscopy, Dynamics, and Photochemistry of Photosensory Flavoproteins§§Tatiana Domratcheva, Anik_ Udvarhelyi, and Abdul Rehaman Moughal Shahi§§11. NMR Spectroscopy on Flavins and Flavoproteins§§Franz Müller§§12. Solid-State NMR of Flavins and Flavoproteins§§Anne-Frances Miller§§13. EPR on Flavoproteins§§Richard Brosi, Robert Bittl, and Christopher Engelhard§§14. FTIR Spectroscopy of Flavin-Binding Photoreceptors§§Daichi Yamada and Hideki Kandori§§15. Resonance Raman Spectroscopy§§Jiang Li and Teizo Kitagawa§§16. Photoactivation Mechanisms of Flavin-binding Photoreceptors Revealed through Ultrafast Spectroscopy and Global Analysis Methods§§Tilo Mathes, Ivo H.M. van Stokkum and John T.M. Kennis§§17. Excited State Chemistry of Flavoproteins§§Raymond F. Pauszek, Goutham Kodali, and Robert J. Stanley§§