Article Bio-sensor platforms Biosensing Techniques Biosensing applications Biosensors CERAMICA CONDUCTIVIDAD TERMICA Canavalia Chemical sensors Copper Enzymes Enzymes, Immobilized Equipment Design Field effect transistors Field-effect transistors Graphene Graphene transistors Graphite Heavy metals Humans Hydrolysis of ureas Layer-by-layer assemblies Limit of Detection Long term stability Metabolism Oxides Polyelectrolyte multilayer Polyelectrolytes Reduced graphene oxides Solutions