A pair of screwless eyeglasses includes a lens assembly, two connecting rods, and two temples. The apparatus comprises a chassis with a chassis fan, a motherboard within the chassis having an expansion card connector, and an expansion card in communication with the expansion card connector and secured to the front end of the chassis. The composition contains at least two types of conjugates, each being at least characterised by a different protein carrier. Synergies between data validation and log-structured storage are exploited. A gate electrode is provided so as to be vertically adjacent to the first and second channel regions.