A new chemical vapor reaction system is described. Specifically, the present invention relates to methods and materials used to isolate and detect a human tumor suppressor gene, termed RASSF1 herein. A checking device is arranged downstream with respect to the first sterilization device along the conveying path in order to check the sterilization procedure. A customer checkout accelerator server module resident on a store controller server determines a preapproval amount for the sales transaction and transmits the request to an external card services system for payment approval. A control signal controls the voice prompt generator based on whether the speech detector detects presence of speech energy in the second frequency band. The socks are stacked in layers, and the water to be treated is trickled down through the layers.