University of Minnesota researcher Janice Frias has cracked a key step closer to making renewable petroleum fuels using bacteria, sunlight and carbon dioxide.
Graduate student Janice Frias, who earned her doctorate in January, made the critical step by figuring out how to use a protein to transform fatty acids produced by the bacteria into ketones, which can be cracked to make hydrocarbon fuels.
Why this is different from other "biofuels" is that instead of generating biomass which is cooked into ethanol (along with the need to have vehicles that can run on ethanol), this process is a drop in replacement for standard diesel.
Ketones are especially useful because they can be dropped into standard catalytic cracking processes which generate standard diesel or other hydrocarbons as output. The inputs are only bacteria, sunlight and atmospheric carbon dioxide.
Given the political hot-potato of "climate change", there is significant interest in using carbon dioxide from the atmosphere to generate fuels. Using carbon dioxide as a source is a double win, because it's freely found in the atmosphere and removing it should be good for the environment.
The bacteria used in Synechococcus, which fixes carbon dioxide into sugars using sunlight as an input. These sugars are in turn passed as feedstock to another bacteria, Shewanella, which produces ketones as an output. The ketones are then cracked into hydrocarbons.
I don't know how scalable this is, but every little helps.