“…As a few applicative examples, a semiconducting-oxidebased chemiresistive microsensor [104] and a sensor system based on the Kelvin probe techniques with a Cu-phthalocyanine dye as the gas sensitive layer [105] for the measurement of NO/NO 2 in human breath, and a multisensory microsystem for the simultaneous measurement of peak expiratory flow, temperature, relative humidity, and pressure [106], have been proposed for the diagnosis of pulmonary disease and asthma. An eight-quartz microbalance-based sensor [105], a semiconducting oxidebased sensor [107] and a light addressable potentiometric sensor [108] were used to estimate the acetone concentration, a marker for diabetes, in breath samples. A quartz crystal microbalance modified with specific oligopeptides [109] was used to distinguish the breath of healthy volunteers from the breath of uremic patients, both before and after dialysis.…”