Simplistically, biosensors can be defined as devices that use biological or chemical receptors to detect analytes molecules in a sample. They give detailed information on the binding affinity and in many cases also the binding stoichiometry, thermodynamics, and kinetics of an interaction. Label-free biosensors, by definition, do not require the use of reporter elements fluorescent, luminescent, radiometric, or colorimetric to facilitate measurements. Instead, a receptor molecule is normally connected in some way to a transducer that produces an electrical signal in real time.
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Single device may have all the additional functions, such as a camera, video camera, calendar, organizer, portable radio, music player, games console, GPS and, now, television. All of this automatically affects user demands concerning the services provided. The more functions are offered by the handhelds, the more advanced and sophisticated services are expected by the customers.
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