Fig. 2

Rheology and spinnability of cystic fibrosis sputum. (a) Spinnability of sputum was assessed at the end of rheological measurements by lifting up the upper plate at a constant velocity of 3.6 mm s^− 1. (b) Amplitude sweep (at 1 rad s^− 1) showing a linear viscoelastic (LVE) regime up to about 1% deformation. The dashed violet lines show the graphical determination of the dynamic yield point / stress. (c, d) Frequency sweeps depicting G’ (storage modulus), G” (loss modulus) and η^* (complex viscosity). The grey dashed lines represent the vertically shifted fitting curves (fitting between 0.1–10 rad s^− 1). The blue dashed lines in (b, c) indicate the calculated instrument inertia limit