TABLE 2.
Microbial contact angle and surface tension dataa
| Parameter | C. parapsilosis | P. aeruginosa |
|---|---|---|
| pH | 7.03 | 7.01 |
| θW (°)b | 15.17 ± 11.5 | 24.42 ± 1.5 |
| θF (°)c | 13.41 ± 1.4 | 32.28 ± 3.9 |
| θD (°)d | 46.63 ± 1.2 | 61.69 ± 0.3 |
| γMLW (mJ · m−2)e | 36.13 ± 0.65 | 27.56 ± 0.15 |
| γM+ (mJ · m−2)f | 1.96 ± 0.39 | 2.05 ± 0.57 |
| γM− (mJ · m−2)g | 51.94 ± 6.42 | 60.29 ± 3.55 |
| A (1020 J) | 6.71 ± 0.12 | 5.12 ± 0.03 |
a
Microbes were examined under three liquids (water, formamide, and diiodomethane). By using the van Oss-Chaudhury-Good equation for the three liquids (45), the three components of surface tension may be calculated. Hamaker constants (A) follow directly from the values of γMLW. SDs of repeated data sets are shown.
b
Contact angle of microbial lawn under double-distilled water.
c
Contact angle of microbial lawn under formamide.
d
Contact angle of microbial lawn under diiodomethane.
e
Apolar (Lifshitz-van der Waals) component of microbial surface free energy.
f
Electron-accepting parameter of the polar microbial surface free energy.
g
Electron-donating parameter of the polar microbial surface free energy.