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Interaction energy for smooth-swimming E. coli interacting with plain quartz in high-ionic-strength, I = 0.2 M medium (—) (the arrow indicates the location of the secondary minimum); plain quartz in low-ionic-strength, I = 0.006 M medium (- - -); hydrophobically coated quartz in high-ionic-strength medium (-----); and positively coated quartz in high-ionic-strength medium (- - - - -). Note that the last two lines overlay each other.
