Penicillin was discovered in 1928 by Scottish scientist Alexander Fleming. People began using it to treat infections in 1942. There are several enhanced penicillin families which are effective against additional bacteria; these include the antistaphylococcal penicillins, aminopenicillins and the antipseudomonal penicillins. They are derived from "Penicillium" fungi. The term "penicillin" is often used generically to refer to benzylpenicillin (penicillin G, the original penicillin found in 1928), procaine benzylpenicillin (procaine penicillin), benzathine benzylpenicillin (benzathine penicillin), and phenoxymethylpenicillin (penicillin V). Procaine penicillin and benzathine penicillin have the same antibacterial activity as benzylpenicillin but act for a longer period of time. Phenoxymethylpenicillin is less
Perfect Day (1929 film) was written in May 1929 and filmed between June 1–8, 1929. The original 1929 release of "Perfect Day" contained no music other than that used over the opening credits. The Roach Studios would reissue the film in 1937 with an added music score being utilized at the time in other Roach comedies. The 1929 version was considered lost until the 2011 DVD release "Laurel and Hardy: The Essential Collection", when the original Vitaphone disc track sans the incidental music became available. Adding the soundtrack in 1937 to the existing film resulted in a slight reduction of the correct frame ratio: