The present invention relates to methods and devices for in-situ measurement of reaction components of interest during manufacturing of polycarbonate by melt polymerization. The information storage medium includes AV data and a markup language document displaying the AV data which is decoded and reproduced and including preload information that allows the reproducing apparatus to read a file to be preloaded for seamless reproduction of the AV data and to store it into a memory. The eddy current probe also includes a sensing coil configured to receive the repetitive electronic signal from the oscillator and detect magnetic fields created by the repetitive electronic signal in a target and produce an electronic signal. The surfactant is reacted with the metal particles such that about 75% to about 100% of a maximum amount of the surfactant adsorbs to the metal particles for improving the resistance of the metal particles to oxidation and for increasing the dispersability of the magnetorheological composition in the carrier fluid. A timer circuit is coupled to the switch and carried by the handle and includes a time period counted down to zero upon activation by the switch changed to the On orientation. In an additional aspect, this invention provides a method for enhancing the yield andor reproducibility in a cell-free protein synthesis system by modulating the level andor activity of a protein component that has regulatory effects on the system.