A comprehensive review of molecular and biomolecular electronics, the final stage in the miniaturization of computer circuitry that provides promising new methodologies for high speed signal processing and communication, novel associative and neural architectures, and linear and nonlinear devices and memories. Includes coverage of quantum electronics, nanoscale semiconductor fabrication, genetic engineering, molecular biophysics, self-assembly, and nonlinear optics. Each chapter includes an overview of the fundamental methods and procedures followed by a review of recent research.