The present invention relates to the provision of novel immunogens comprising an antigenic IgE peptide preferably linked to an immunogenic carrier, compositions comprising the immunogens, and methods for the prevention, treatment or alleviation of IgE-mediated disorders. The charging circuit sets a charging rate for charging as a function of a signal generated outside the charging surface. The method of recovering from the off-track write condition comprises the steps of receiving a write command to write a first series of data blocks on the first track. A coefficient production circuit produces coefficient data sets Wi for each class based on coefficient seed data sets and values of picture quality adjusting parameters h and v. The airborne filtering channel is configured to receive a flow of air from the spinning disc at the inlet opening, pass the flow of air through the filter cavity and to discharge the flow of air at the outlet opening.