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Q-Sense instruments are based on the patented QCM-D technique. The instruments measure in real-time the mass of molecular layers that form on the quartz sensor. Simultaneously structural (viscoelastic) properties of such molecular layers are monitored, which enables the distinction between two similar interactions or the observation of conformational changes in bound layers. Measurements of both mass and structural properties gives a thorough understanding of binding events such as molecular adsorption and interaction.