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Observed values of the relative chemotactic velocity VC/v3D of E. coli toward α-methylaspartate, as a function of χ0Q (Eq. 10), where χ0 = 12.4 × 10−4 cm2 s−1 from the experiments. Symbols correspond to the three initial concentrations C0 = 0.1 (•), 0.5 (▴), and 1.0 mM (▪). The highest value of VC/v3D achieved in our experiments was 0.35. The dashed curve represents the theoretical prediction (Eq. 9), which plateaus at VC/v3D = 2/3 (not shown).
