TABLE 1.
Critical shear stresses and forces at the balance between bacterial attachment and detachment and upper limits for shear-induced detachment of three bacterial strains on pristine and PEO-coated silicone rubbera
| Strain | Critical shear stress (Pa)
|
Critical shear force on a single bacterium (pN)
|
Upper limit of shear-induced detachment (%)
|
|||
|---|---|---|---|---|---|---|
| SR | PEO | SR | PEO | SR | PEO | |
| S. epidermidis HBH276 | 2.7 ± 1.1 | 0.2 ± 0.1 | 2.1 ± 0.9 | 0.1 ± 0.1 | 9.7 ± 3.5 | 91.1 ± 8 |
| S. aureus ATCC 12600 | 1.0 ± 0.2 | 0.1 ± 0.0 | 0.8 ± 0.1 | 0.1 ± 0.0 | 3.3 ± 0.5 | 86 ± 5.3 |
| P. aeruginosa #3 | 1.1 ± 0.2 | 1.3 ± 0.5 | 1.3 ± 0.3 | 1.6 ± 0.6 | 29.2 ± 3.8 | 31.8 ± 6.9 |
a
SR, pristine silicone rubber; PEO, PEO-coated silicone rubber. Values are means ± standard errors calculated for a series of five data points, each representing the results of two experiments with separately grown bacteria on separately prepared surfaces.