Table 4: Surface tension and hydrophobicity of the four pathogens determined from contact angle measurement.

OrganismpH

A. hydrophila6
7
8

E. coli 0157:H76
7
8

S. enteritidis6
7
8

S. aureus6
7
8

Free energy of aggregation of the microorganisms in water where and are, respectively, the Lifshitz-van der Waals contribution energies, electron acceptor (acid), and electron donor (basic) components of the wetting agent and bacterial lawn, Lewis acid-base bonds and the total surface energy of the bacteria.
In a column, for a given bacterium, values with the same letter are not significantly different