TABLE 1.

Biofilm formation of wild-type and LuxS-deficient A. actinomycetemcomitans^a

Strain	Exogenous AI-2	Flow rate (ml/h)	Mean biofilm depth (μm)	Biomass (μm3/μm2)
JP2 (wild type)	−	6	44.4 ± 12.3	0.274 ± 0.105
luxS mutant	−	6	19.9 ± 8.5*	0.028 ± 0.006**
luxS mutant	+	6	42.8 ± 13.6	0.250 ± 0.072
luxS-pluxS	−	6	45.2 ± 11.8	0.220 ± 0.051
JP2	−	35	14.3 ± 4.1	0.112 ± 0.027
luxS mutant	−	35	5.5 ± 2.4*	0.015 ± 0.004*

^a*, P < 0.01; **, P < 0.001.