1. Kinetic medium effects on organic reactions in aqueous colloidal solutions2. Photoremovable Protecting Groups Based on Photoenolization3. The Chemistry of Reactive Radical Intermediates in Combustion and the Atmosphere4. Stable Carbocations and Onium Ions from Polycondensed Aromatic and Heteroaromatic Compounds as Models for Biological Electrophiles and DNA-Transalkylating Agents5. Structural and Biological Impact of Radical Addition Reactions with DNA Nucleobases. 6. Recent Studies of Persistent Carbodications