@article{mbs:/content/journal/micro/10.1099/00221287-17-2-424, author = "Quadling, C. and Stocker, B. A. D.", title = "The Occurrence of Rare Motile Bacteria in some Non-motile Salmonella Strains", journal= "Microbiology", year = "1957", volume = "17", number = "2", pages = "424-436", doi = "https://doi.org/10.1099/00221287-17-2-424", url = "https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-17-2-424", publisher = "Microbiology Society", issn = "1465-2080", type = "Journal Article", abstract = "SUMMARY: The presence of rare motile bacteria in 22 of 48 non-motile Salmonella strains tested has been inferred from the production of satellite micro-colonies in semi-solid medium. Such rare motile bacteria have been isolated by micromanipulation ; they are not motile mutants, since their progeny are nearly all non-motile. They transmitted motility to only a few of their descendants, as if their motility were due to the presence of non-multiplying motility-conferring particles which were transmitted to their progeny at cell division. It is inferred that small numbers of such particles arise during an intracellular ‘event’; this event probably consists of a transient ability to synthesize new flagella. The frequency of events in one Salmonella O strain was found to be c. 4 × 10−5/bacterium/generation.", }