title: Statistical modeling and analyses of a base-specific Salmonella mutagenicity assay.
abstract: Statistical features of a base-specific Salmonella mutagenicity assay are considered in detail, following up on a previous report comparing responses of base-specific Salmonella (Ames II) strains with those of traditional tester strains. In addition to using different Salmonella strains, the new procedure also differs in that it is performed as a microwell fluctuation test, as opposed to the standard plate or preincubation test. This report describes the statistical modeling of data obtained from the use of these new strains in the microwell test procedure. We emphasize how to assess any significant interactions between replicate cultures and exposure doses, and how to identify a significant increase in the mutagenic response to a series of concentrations of a test substance.
authors.affiliation: Department of Statistics, University of South Carolina, 216 LeConte College, Columbia, SC 29208, USA. piegorsc@stat.sc.edu
authors.forename: W W
authors.initials: WW
authors.lastname: Piegorsch
authors.forename: S J
authors.initials: SJ
authors.lastname: Simmons
authors.forename: B H
authors.initials: BH
authors.lastname: Margolin
authors.forename: E
authors.initials: E
authors.lastname: Zeiger
authors.forename: X M
authors.initials: XM
authors.lastname: Gidrol
authors.forename: P
authors.initials: P
authors.lastname: Gee
mesh_terms: D000704:Analysis of Variance; D001555:Benzene Derivatives / Q000494:pharmacology; D005838:Genotype; D015233:Models, Statistical; D009152:Mutagenicity Tests / Q000706:statistics & numerical data*; D009153:Mutagens / Q000494:pharmacology; D009154:Mutation; D009582:Nitrofurantoin / Q000494:pharmacology; D012486:Salmonella typhimurium / Q000145:classification / Q000235:genetics*; D012699:Serology
chemical_list: D001555:Benzene Derivatives; D009153:Mutagens; D009582:Nitrofurantoin; C007164:cumene hydroperoxide