The present invention relates to a semiconductor integrated-circuit device capable of seamlessly switching a power source obtained by rectifying a carrier wave and an external power source. In particular compounds such a transcription factors can be screened. The carbon matrix can have a volume of nanoporosity between 10 and 99%. There is a second star detector in at least one second focal plane. The hidden signature is thereafter written to the optical disc by writing a set of corresponding data blocks at selected locations on the optical disc having states corresponding to the multi-value logical word.