dna should be in the order of several microns dna length may also be expressed as the number of base pairs bp attached to the phosphate backbone of the dna molecule the dna utilized by the present invention is genomic dna though coliphage lambda dna was used in the experimental portions of the present invention the invention is not limited to being practiced with lambda dna and any genomic dna may be used lambda dna was chosen because its entire 48 502 base pair sequence is known and its restriction enzyme map fully characterized lambda dna is derived from e coli and is commercially available fig1 is a schematic representation of the preparation of single stranded dna and single wall cnt single stranded dna complexes according to embodiments of the present invention in fig1 the first step is to perform a polymerase chain reaction pcr designed to amplify a long length base pair segment of double stranded dna dsdna the template dsdna using two short base pair length primers one of the primers is modified to include a thiol u2014 sh group on its 5 u2032 end the other primer is unmodified the dsdna may be prepared by digestion of a longer dsdna using a restriction enzyme the amplified dsdna segments now thiolated dsdna are modified from the original dsdna segment by having thiol.