A team at the University of British Columbia in Vancouver, Canada, has created microbial fuel cells by surrounding yeast cells in a flexible capsule. The fuel cells are able to generate power from human blood plasma.
These fuel cells consist of colonies of Saccharomyces cerevisiae, the type of yeast used in brewing and baking, which are placed in a cell made from a form of silicone.
The fuel cells are only 15 millimetres square and 1.4 mm thick.
Biological power plants such as these could be incredibly useful for devices that are implanted into the body, such as pacemakers and intraspinal microelectrodes for treating paralysis.