Nano wires are now being produced via bacteria:-

A strain of bacteria has surprised researchers with its ability to build conducting nanowires, the long, very thin wires are unprecedented in biological systems, says the microbiologist who discovered the bacteria and the wires' conductivity. They completely change science's understanding of how microbes handle electrons. Exactly what the wires are made of is still under investigation, but the gene that codes for them has been identified. This opens up the possibility of using genetic engineering and systems biology to manufacture wires with predetermined properties. The bacteria may organize to form minipower grids in the soil by linking up via the nanowires. This type of organized behavior may lead to ultrasmall environmental sensors or novel ways to bioengineer nanocircuits. The ability of the bacteria to link their nanowires has been observed in the lab. The hairlike wires emanating from the bacteria had been seen previously, but their conducting function was discovered via atomic-force microscope techniques.