Presenting stretched strands of single strand dna for sequencing double strand dna

A system for presenting single strands of a double strand molecule to a membrane, the system comprising:

• a membrane comprising a first side opposite a second side opposite, the double strand molecule driven to the first side of the membrane by an electric field from a voltage source, the membrane comprising a first nanopore and a second nanopore spaced apart by a nanopore separation distance;
• a first reservoir on the first side, the double strand molecule introduced on the first side and comprising a first strand and a second strand when driven to the first side of the membrane;
• wherein the voltage source causes the first strand of the double strand molecule to be captured in the first nanopore by the electric field when the double strand molecule is driven to the first side of the membrane;
• wherein the second strand of the double strand molecule is captured in the second nanopore by having the nanopore separation distance between the first nanopore and the second nanopore corresponding to a strand separation distance between the first strand and the second strand, by having captured the first strand to limit diffusion of the second strand, or both by having the nanopore separation distance between the first nanopore and the second nanopore corresponding to a strand separation distance between the first strand and the second strand and by having captured the first strand to limit diffusion of the second strand;
• and
• a second reservoir on the second side, the first strand in the first nanopore and the second strand in the second nanopore are individually stretched by the first strand and the second strand recombining on the second side of the membrane in the second reservoir.