Disclosed is a method of preparing a thiohydrazide product compound from a hydrazide starting compound. The first subtractor subtracts a speed reference from a speed feedback signal to obtain a speed deviation. The inner seal diameter interfaces with the outer groove diameter and the outer seal diameter is greater than the outer roller diameter. The antenna also includes an electrically conductive ground plane located at andor to a second side of the imaginary plane. The first inverter and the second inverter are configured to provide a differential output voltage signal between the first output node and the second output node. Unrelated individuals having a myelinopathy from Dejerine-Sottas syndrome have recessive PRX mutations.