TABLE 1.

Detection of PIA and hexosamine in crude extracts of S. epidermidis 1457 and biofilm-negative transposon mutant 1457-M11^a

Strain and medium	Biofilm formation (OD570)	Hexosamine concn (μg/ml)b	PIA titer
1457
TA + Glc	2.50	9.88	1:64
TA − Glc	0.06	0	Negative
1457-M11
TA + Glc	0.02	0	Negative
TA − Glc	0.05	0	Negative

^aBoth strains were grown in T_A in the presence or absence of glucose.

^bLimit of detection, 1.3 μg/ml.