Gigabit Ethernet connectivity is realized using off-the-shelf GIGABIT INTERFACE CONVERTER transceivers, wave division multiplexerdemultiplexers, and a single optical fiber. The body has an operation surface and a protrusion action portion. A retainer is disposed above the platform. Since ends of the source electrode or the drain electrode are formed inside ends of the semiconductor layer, leak current at the ends of the semiconductor layer can be reduced. The method of detecting melamine may optionally include concentration of the SERS-active particles. Under the proposed approach, an OEL-emitting member is fabricated as the substrate of the biochip on which the biological samples, such as DNA, proteins and other related small molecules, are processed for the desired applications, including but not limited to, analysis of biological molecules, such as electrophoretic separation, PCR amplification and hybridization.