Fig. 6
From: Airway surface liquid pH is not acidic in children with cystic fibrosis
Fibre-optic pH probes. a Calibration curves obtained from measurements of three individual sensors at 37 °C and chemical structure of the pH indicator (BF2-chelated hydroxy-tetraarylazadipyrromethane28). b Photograph of the tip of the pH probe protruding from the working channel of a bronchoscope. c Photograph of the plastic optical fibre
