A method is provided of detecting one of a set of preamble sequences in a spread signal. The masked beam is then scanned and reflected off a bar code and received by a photodetector. The invention also relates to methods of using these compounds to treat or otherwise ameliorate such disorders. The chemisorbed first species is contacted with remote plasma oxygen derived at least in part from at least one of O2 and O3 and with remote plasma nitrogen effective to react with the first species to form a monolayer comprising an oxide of a component of the first species monolayer. Stabilzer compositions and fibrous material stabilized according to the invention, containing a whiteness stabilizer of group to are also disclosed.