The present invention provides substance which can specifically interact with sugar chains. A controller controls a frequency of sweep-out of unnecessary charge in the imaging element on the basis of the output of the operating condition judging circuit. When a dispatch button is depressed, a request for recording of the audio andor visual content which is currently selected is sent to a server. The cable adjustably connects the adjusting base, the two retractable shields, the shuttle and the fixing base together. In said manner image defects induced by the projection light are corrected. Such checkpointing may involve storage of input andor output data prior to andor after execution of a task on a node.