, micro-rheology, particle diffusion tracking (DWS), surface tension measurement, fluorescence analysis, relaxation analysis after deformation, respiratory diseases (cystic fibrosis, COPD, asthma), nasal mucus, bronchial mucus, gastric mucus, cervical mucus, biofilm formation, hyperviscosity, mucociliary clearance dysfunction, mucolytic therapies, mucus-pathogen interaction, multi-scale characterization