Growth of Salmonella in LB medium (a), BMM plus betaine (b), and BMM (c). NaCl concentrations: open square, 1%; open diamond, 2%; open triangle, 3%; open circle, 3.5%; closed square, 4%; closed diamond, 4.5%; closed triangle, 5%; closed circle, 5.5%; plus sign, 6.2%; times sign, 7.0%; and minus sign, 7.5%. The fitted primary model was obtained by assuming a dying and a growing initial subpopulation.