A cell-based assay is provided for screening substances for the capacity to inhibit COX-2 activity. Because input and output sentences are written in different languages, automatic speech translation requires techniques for processing different languages. The light-emitting diode unit has an anode terminal and a cathode terminal. As a vehicle passes through, the mobile detector scans the vehicles to detect levels of one or more designated materials. The system program includes a programming module and a control module. Integral lighting and information displays facilitate field surgical procedures.