The present invention provides a composition comprising precious metal particles for treating or preventing a psychiatric symptom. A storage control system includes controller units 130A and 130B for performing processing for data IO tofrom drives 150 and 160 in response to a data IO request from a host device 100, switches 140A and 140B connecting the controller units 130A and 130B and the drives 150 and 160, and a port selector 300 inserted between the switches 140A and 140B and the drive 160. These diffusers are combined with an impeller using thick blades. The reading control portion executes a reading operation for a document by the low and high resolution imaging portions, selecting the first reading portion or selecting both of the reading portions.