1. Contact me at [email protected] / Friend me on Facebook (kevin.g.ahern) 2. Download my free biochemistry book at http://biochem.science.oregonstate.ed... 3. Take my free iTunes U course at https://itunes.apple.com/us/course/bi... 4. Check out my free book for pre-meds at http://biochem.science.oregonstate.ed... 5. Course video channel at http://www.youtube.com/user/oharow/vi... 6. Check out all of my free workshops at • Kevin's Guides 7. Check out my Metabolic Melodies at http://www.davincipress.com/metabmelo... 8. Take my courses for credit (wherever you live) via OSU's ecampus. For details, see http://ecampus.oregonstate.edu/soc/ec... 9. Course materials at http://oregonstate.edu/instruct/bb450 A lecture by Kevin Ahern describing mechanisms of catalytic action for chymotrypsin, serine proteases, cysteine proteases, metalloproteases, aspartyl-proteases, and carbonic anyhdrase.