title: PARA-AMINOBENZOIC ACID PRODUCTION BY STAPHYLOCOCCI.
abstract: 1. Strains of staphylococci produce diazotizable materials which can be converted to a dye, and the intensity of the color reaction can be quantitated in the same manner as p-aminobenzoic acid. The sulfonamide-resistant strains which we have studied produce more diazotizable substance than non-resistant strains. 2. The development of a color by the diazotizable substance can be inhibited by exposing the substance to a soil bacillus (Mirick) specifically adapted to oxidize PABA. 3. The diazotizable substance produced by staphylococci inhibits the anti-staphylococcic action of sodium sulfathiazole to approximately the same degree as equivalent amounts of pure p-aminobenzoic acid. 4. Two microbiological methods for assaying p-aminobenzoic acid were employed for quantitating the amount of this material produced by staphylococci. In general, the sulfonamide-resistant strains produced more p-aminobenzoic acid than the sulfonamide-sensitive strains. The inconstant results obtained with these biological assays are discussed.
authors.affiliation: Division of Internal Medicine, University of Minnesota Hospitals and Medical School, Minneapolis, and the Medical-Research Division, Sharp and Dohme, Inc., Glenolden, Pennsylvania.
authors.forename: W W
authors.initials: WW
authors.lastname: Spink
authors.forename: L D
authors.initials: LD
authors.lastname: Wright
authors.forename: J J
authors.initials: JJ
authors.lastname: Vivino
authors.forename: H R
authors.initials: HR
authors.lastname: Skeggs