title: Bacteriocin typing by leakage of ultraviolet light-absorbing material.
abstract: A rapid and reproducible method of bacteriocin typing is described based on leakage of ultraviolet light-absorbing material (UVAM), detectable in supernatants of bacteriocin-sensitive cultures, by means of a spectrophotometer. The prerequisites for reproducible results, with nonsignificant fluctuations in standard error of the mean, are: a set of standardized bacteriocins, produced under defined conditions and of determined strength. These must interact with the unknown bacterial culture in suspension and at a given ratio in order to achieve an optimal multiplicity of interaction. Pyocin and colicin typing by the "scrape and streak" technique of Gillies (J. Hyg. 62:1-10, 1963) was compared with the UVAM leakage method in 275 tests; the two tests were found to be in good agreement for the strains tested.
mesh_terms: D001419:Bacteria / Q000145:classification*; D001430:Bacteriocins; D001431:Bacteriological Techniques; D003087:Colicins; D004926:Escherichia coli / Q000145:classification; D011550:Pseudomonas aeruginosa / Q000145:classification; D011709:Pyocins; D012764:Shigella sonnei / Q000145:classification; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001430:Bacteriocins; D003087:Colicins; D011709:Pyocins