Derek Lovley ha isolato i batteri Geobacter nel 1987 e nel 2005 ha pubblicato uno studio sulla loro conduttività: Extracellular electron transfer via microbial nanowires (Nature 435, 1098-1101, 23 June 2005).
Andrea Mameli www.linguaggiomacchina.it
Tunable metallic-like conductivity in microbial nanowire networks (Nature Nanotechnology, august 7, 2011)
Nikhil S. Malvankar, Madeline Vargas, Kelly P. Nevin, Ashley E. Franks, Ching Leang,
Byoung-Chan Kim, Kengo Inoue, Tünde Mester, Sean F. Covalla, Jessica P. Johnson,
Vincent M. Rotello, Mark T. Tuominen, Derek R. Lovley
Electronic nanostructures made from natural amino acids are attractive because of their relatively low cost, facile processing and absence of toxicity. However, most materials derived from natural amino acids are electronically insulating. Here, we report metallic-like conductivity in films of the bacterium Geobacter sulfurreducens and also in pilin nanofilaments (known as microbial nanowires) extracted from these bacteria. These materials have electronic conductivities of ~5 mS cm −1 , which are comparable to those of synthetic metallic nanostructures. They can also conduct over distances on the centimetre scale, which is thousands of times the size of a bacterium. Moreover, the conductivity of the biofilm can be tuned by regulating gene expression, and also by varying the gate voltage in a transistor configuration. The conductivity of the nanofilaments has a temperature dependence similar to that of a disordered metal, and the conductivity could be increased by processing.
- Geobacter Projechttp://www.blogger.com/img/blank.gift (University of Massachusetts)
- Computers and Electrifying Bacteria
- Geobacter Nanowires Can Be Tuned To Act As Transistors