This Universe Today entry discusses experiments using cyanobacteria to break down simulated lunar soil into useful ingredients.
Cyanobacteria harvested from the chambers could then be further processed to make use of the elements they extract from the lunar soil. For example, they could be broken down by other bacteria, resulting in a nutrient-rich soup that could be used as fertilizer for food plants grown in hydroponic greenhouses. Methane given off by the breakdown of the cyanobacteria could be used as rocket fuel.
Originally from New Scientist.