The invention concerns a nucleic material, in isolated or purified state, and a nucleotide fragment comprising a nucleotide sequence selected from the group consisting in the sequences SEQ ID NO: 112, SEQ ID NO:114, SEQ ID NO: 117, SEQ ID NO: 120, SEQ ID NO. The disc drive includes a data transducer selectively positionable over the data disc for transferring data to and from the data disc, and the data disc includes a plurality of zones of predefined tracks. The server sends out multicasts with payloads that identity, for example, manufacturers and model numbers of client receivers. Also claimed are modified pigments having that compound on their surface, and also pigment compositions and dispersions comprising that compound. A changeover mechanism selectively retains the convertible dock ramp in the ramp configuration or the stair configuration.