Both enzymatic pathway (degradation by keratinase) and non-enzymatic pathway that is sulfitolysis occurred in the degradation process by streptomycete sp.B221.
We went to talking about completed actions that we know that something was completed in the simple past at a very specific time, and that's why we did that specific point, SP, simple past, SP, to remind us.
These occur when an atom is either triple bonded to another atom or is double bonded to 2 atoms. The sp orbital, the one that forms the sigma bonds here, is linear.
People are inclined to put everybody on pedestals, but of course… SP: Yes, and you don't put your parents on a pedestal, at least not when you're a teenager.