The invention described herein provides for methods and systems for determining, selecting, andor treating diseases and conditions caused by or associated with high quantities of methanogens in a subject, or diseases and conditions caused by or associated with low quantities of methanogens in a subject. Method and apparatus are presented herein for generating an optimized preamble structure for use with transmissions of packetized data. In connection with the melting of one or several of the limited areas, the radiation gun is regulated so that the melted area is cooled in accordance with a stipulated time-temperature curve in order to form a composite of crystalline or nanocrystalline metal particles in a matrix of amorphous metal.