Biosensors for Health, Environment and Biosecurity by P. Serra

By P. Serra

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Fig. 11. 4, both with and without the enzyme located on the nanorods. 32 Biosensors for Health, Environment and Biosecurity 20 Change of Ids (A) no enzyme with enzyme 15 10 5 0 10 0 10 1 10 2 10 3 10 4 10 5 Concentration (nM) Fig. 12. Change in drain-source current in HEMT glucose sensors both with and without localized enzyme. Fig. 13. 4(red line). AlGaN/GaN High Electron Mobility Transistor Based Sensors for Bio-Application 33 The human pH value can vary significantly depending on the health condition.

Thus, to ensure the safety of public health, it is very important to accurately and effectively monitor chlorine residues, typically in the form of chloride ion concentration, during the treatment and transport of drinking water (Taylor and Hong 2000, Walker, Hall and Hurst 1990, Cook and Miles 1980, Elsheimer 1987, Verma and Parthasarathy 1996, Graule et al. 1989, Kumar, Venkatesh and Maiti 2004, Blackwell et al. 1997). , by the kidneys. Variations in the chloride ion concentration in serum may serve as an index of renal diseases, adrenalism, pneumonia and, thus, the measurement of this parameter is clinically important (Walker et al.

However, the drain current gradually decreased. This was due to the oxygen produced in the GOx-glucose interaction reacting with water and changing the pH value adjacent the gate area. Since there was not agitation in the glucose solution, the solution around gate area became more basic and the activity of GOx decreased due to the high pH value environment from 60 to 85 min. Because the lower activity of GOx in the high pH value condition, the amount of oxygen produced from GOx and glucose decreased as well during the period of 60-85 min.

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