TABLE 2.

Viable counts and total protein concentration of Streptococcus pneumoniae biofilms collected from once-through biofilm tube reactors^a

Biofilm age (days)	Viable cell count per biofilmb (CFU)	Total protein concentration per biofilmb (μg)
3	1.96 × 108 (3.9 × 107)	1,968 (560)
6	3.87 × 108 (1.1 × 107)	6,897 (2,210)
9	6.74 × 108 (1.1 × 107)	14,950 (2,192)

^aCFU and protein concentration were obtained from 3-, 6-, and 9-day-old biofilms. Numbers in parentheses are standard deviations.

^bThe total surface area per biofilm was 150 cm².