By making the beam polarization state in a cross prism having a dichroic function for an incident beam on a reflection type liquid crystal panel the same as that for a reflected ON beam, a small-sized, low cost projection type projector apparatus is provided. An RF signal includes an encoded carrier wave having a carrier frequency of between 5 MHz and 19. In one example, the composition is changed to a mixture of aluminum oxide and titanium oxide andor titanium. Still yet another benefit is that only basic hand tools are required for retrofitting existing doors. A set of precursor ions that has substantially similar intensity ratios in both sample portions is determined to be associated with the same polypeptide.