fluctuation test

fluctuation test

[‚flək·chə′wā·shən ‚test]
(microbiology)
A method of demonstrating that bacterial mutations preexist in a population before they are selected; a large parent population is divided into small parts which are grown independently and the number of mutants in each subculture determined; the number of mutants in the subculture will fluctuate because in some a mutant arises early (giving a large number of progeny), while in others the mutant arises late and gives few progeny.
References in periodicals archive ?
The mass was negative for fluctuation test and transillumination test.
1975) or fluctuation test (Luria and Delbruck 1943; Hubbard et al.
In this study, leachates made with crumb rubber infill collected directly from the surfaces of four separate artificial athletic fields (fields A through D) were assayed for mutagenic potential with fluctuation tests. The approximate age in years of fields A, B, C, and D were nine, four, two and less than one, respectively.
In addition, a series of fluctuation tests was performed on field B crumb rubber leachates made at temperatures of 40[degrees]C, 50[degrees]C, 55[degrees]C, 60[degrees]C and 70[degrees]C.
Salmonella / microsome fluctuation test (Ames fluctuation test).