TABLE 2.

Percentages of culturable cells in the total population and the subpopulations of S. Typhimurium obtained after a Radioselectan density gradient centrifugation of 10-h, 24-h, and 48-h cultures

Cell populationa	% Culturable cellsb
	10 h	24 h	48 h
Total population*	104 ± 11	82 ± 5.9	62 ± 0.66
Total population**	94 ± 6.6	77 ± 5.0	61 ± 9.1
LD	100 ± 5.5	104 ± 15	101 ± 11
MD	100 ± 2.1	55 ± 7.5	43 ± 14
HD	8.5 ± 1.6	2.4 ± 0.50	1.9 ± 0.61

^a*, before ultracentrifugation. **, after ultracentrifugation and rehomogenization of cells in the tube.

^bMeans ± standard deviations for triplicate cultures.