This book describes the design, construction, optimization and applications of biosensors, including the biological component, its attachment to the transducer, and interfacing of the sensing element to appropriate electronic circuitry. In addition, typical applications of the sensor are described, along with any specimen pretreatment that may be necessary to remove interferences or ensure linearity of the sensor's response. A final chapter on the theoretical analysis of biosensor response characteristics is provided to aid in optimizing any device's performance. Biosensors provides an up-to-date account of techniques which today are being widely used by life scientists in universities and industry.