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. Author manuscript; available in PMC: 2009 Dec 1.
Published in final edited form as: J Periodontal Res. 2009 Jul 8;44(6):751–759. doi: 10.1111/j.1600-0765.2008.01187.x

TABLE 2.

Phototoxicity mediated by MB in plaque-derived biofilmsa

Subject no. L+MB- L-MB+ (25 μg/ml) L-MB+ (50 μg/ml) L+MB+ (25 μg/ml) L+MB+ (50 μg/ml)
6 98.6 96.2 76.5 96.3 45.5
7 91.2 98.3 101.8 92.1 83.6
8 95 83.4 69.7 84.7 64.4
9 115.4 95.9 95.5 104.8 88.1
10 106 106 97.5 80.5 58.3
Mean survival fraction 103.2 95.9 88.2 91.6 67.9
SEM 5.2 3.6 6.3 4.2 7.9
a

The percent survival of bacteria was assayed by the colony-forming assay after incubation with 25 or 50 μg/ml MB for 5 min followed by exposure to light (30 J/cm2) at 665 nm. Surviving bacteria were expressed as a percentage of dark controls (L-MB-). Each value represents the mean survival fraction from 3-4 independent experiments.