title: Statistical inferences about injury and persistence of environmentally stressed bacteria.
abstract: A standard technique for ascertaining the survival characteristics of bacteria after being environmentally stressed is to incubate the bacteria on both selective and non-selective media and count the colonies produced. Based on these colony counts, indexes of injury and persistence of the bacteria are calculated. To compare the stress of two different environments, a persistence ratio is calculated. In this paper, methods of statistical inference concerning these indexes and ratios are presented. These statistical methods use well-known procedures for analysis of binomial data and 2 times 2 table data, and are appropriate when the colony counts follow a Possion distribution.
mesh_terms: D001419:Bacteria / Q000254:growth & development*; D002452:Cell Count; D002470:Cell Survival; D003470:Culture Media; D004781:Environmental Exposure; D008954:Models, Biological; D011336:Probability
chemical_list: D003470:Culture Media