TABLE 2.

Average adhesion force, F_adh, as probed with hydrophobic and hydrophilic AFM tips for two selected Lactobacillus strains with and without SLP and showing dynamic cell surface hydrophobicity upon changes in ionic strength^a

Strain	Ionic strength (mM)	Contact angle (°)	Fadh (nN) with tip:
			Hydrophobic	Hydrophilic
L. acidophilus ATCC 4356 with SLP	10	76 ± 4	−1.34 ± 0.19	−0.11 ± 0.02
	100	47 ± 3	−0.88 ± 0.13	−2.14 ± 0.17
L. casei ATCC 393 without SLP	10	32 ± 5	−0.91 ± 0.09	−1.96 ± 0.33
	100	65 ± 5	−2.31 ± 0.45	−0.47 ± 0.12

^aAFM data are representative of results obtained from three to five cells, with use of different probes and independent preparations.