In bulk protein purification, a common first step to isolate proteins is precipitation with ammonium sulphate (NH 4) 2 SO 4. This is performed by adding increasing amounts of ammonium sulphate and collecting the different fractions of precipitate protein.rotein purification is a series of processes intended to isolate one or a few proteins from a complex mixture, usually cells, tissues or whole organisms.
Phenolic disinfectants are effective bactericides, fungicides, tuberculocides and virucides, but are ineffective against spore-forming bacteria such as Clostridium difficile. EPA-registered phenolic disinfectants are used to disinfect surface areas and non-critical medical devices.
Historical Examples. 1  For only the Gentiles were allowed to receive the disinfectant. 2  A disinfectant is an agent which destroys germs of infection. 3  A disinfectant is therefore an antiseptic, but an antiseptic may not be a disinfectant. 4  A deodorant is not necessarily a disinfectant, nor is every disinfectant a deodorant.