1. Ultraviolet spectroscopy and excited of heterocyclic molecules 2. Photochemistry of three- and four-membered heterocyclic rings 3. Photoisomerization of five-membered heterocyclic compounds 4. Photoisomerization of six-membered heterocyclic compounds 5. Photochemistry of seven-membered and higher heterocyclic systems 6. Photochemically induced fragmentation reactions of heterocyclic compounds 7. Photooxidation of heterocyclic compounds 8. Photoreduction and photoaddition reactions of heterocyclic compounds 9. Heterocyclic based photoactive materials 10. Industrial aspects of heterocyclic photochemistry