TABLE 2.

Statistics for the Fn/peptide system

qN%	Tip	F (pN)
q0.6%	Bare	21.4 (6.2)
	Peptide	22.5 (9.8)
q2.0%	Bare	34.4 (10.2)
	Peptide	54.8 (22.3)
q3.0%	Bare	55.7 (24.2)
		Peptide	n.a.

When adsorbed Fn is present, there is a high probability that an interaction with the peptide-functionalized tip will occur. The method used to calculate interactions does not consider the point of separation as an interaction. For both the bare tip and the collagen-related-peptide-functionalized tip, the force increases with surface concentration of Fn. The highest surface concentration used with the collagen-related-peptide-functionalized tip resulted in significant tip fouling, and an interaction force was not calculated. The values were calculated from the empirical probability density function, where μ = Σx_ip_i and σ² = Σ(x_i − μ)²p_i. Standard deviations are in parentheses. n.a., not applicable.