A system and method for reliably testing for toxic substances is described. The computer system further includes an XML processor configured to receive, parse, and process an XML input data stream and obtain schema identified in the XML data stream from a schema repository. In one embodiment, the assembly further includes a bottom bracket shell for receiving the spindle and bearing for rotatably supporting the spindle in the shell, where the bearings are mounted directly to the shell. A plurality of cells is formed over the first conductive electrodes. The process comprises hydrating carnitine nitrile to form carnitinamide using a catalyst containing a manganese oxide, and thus carnitinamide substantially free from by-produced carnitine is produced in high yield, so that carnitinamide of extremely high purity can be obtained through simple and easy crystallization operation.