chemostat

noun
che·mo·stat | \ˈkē-mə-ˌstat, ˈkem-ə- \

Medical Definition of chemostat 

: a device in which bacteria are kept uniformly suspended in a culture medium that is constantly renewed and maintained chemically unaltered by a continuous flow of new medium through it and which is used especially in quantitative studies of mutation rates

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not any or not one

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