Part I Mitochondria.- Function and regulation of mitochondrial voltage-dependent anion channel.- Mitochondrial Protein Import Channels.- Electrophysiology of the mitochondrial apoptosis-induced channel, MAC.- Ceramide Channels.- Part II Bacteria and viruses.- Bacterial Porins.- Electrophysiology of Bacterial Translocons.- Viroporins.- Part III Toxins and antimicrobial peptides.- Pore-forming colicins- unusual ion channels -unusually regulated.- Anthrax Toxin Protective Antigen Forms an Unusual Channel that Unfolds and Translocates Proteins Across Membranes.- Staphylococcal b-barrel Pore-forming Toxins: Mushrooms That Breach the Greasy Barrier.- Properties of pores formed by cholesterol-dependent cytolysins and actinoporins.- Part IV Other unconventional channels.- Perforins.- Gap Junction Channels: The electrical conduit of the intercellular world.- Amyloid Peptide Channels.- From phototaxis to biomedical applications: Investigating the molecular mechanism of channelrhodopsins.