||Bacteria Escherichia coli
||Walter JM, Greenfield D, Bustamante C, Liphardt J. Light-powering Escherichia coli with proteorhodopsin. Proc Natl Acad Sci U S A. 2007 Feb 13 104(7):2408-12. DOI: 10.1073/pnas.0611035104 abstractPubMed ID17277079
||Abstract: "By measuring the pmf [proton motive force] of individual illuminated cells,
[researchers] quantify the coupling between light-driven and respiratory
proton currents, estimate the Michaelis–Menten constant (Km) of
PR [Proteorhodopsin] (10^3 photons per second/nm^2), and show that light-driven
pumping by PR can fully replace respiration as a cellular energy
source in some environmental conditions."