A suction fan and an exhaust fan are disposed in both the sides of a process cartridge so as to be opposed to each other across the process cartridge. The cache may store old lines having old instructions. The invention also concerns polynucleotides coding for the mutated R9M immunogenic peptides, cellular expression vectors comprising nucleic acid sequences expressing the mutated R9M immunogenic peptides and polyclonal or monoclonal antibodies capable of being fixed on at least one of said peptidespolynucleotides. The method comprises exhausting a chamber to form a vacuum chamber, and then purging vacuum chamber and introducing a catalyst. It has been observed that even if some dielectric breakdown occurs, the connected fibers are not as conductive and the effect has been found not to be as significant as is the case with the usual carbon fibers which have maximized conductivity.