Their method relied on briefly bathing blood cells from newborn mice in a mildly acidic solution and then tweaking culture conditions to produce stem cells. (sciencemag.org)
Other approaches suffer from the use of costly, inefficient, or unstable materials, such as titanium dioxide, that also might involve adding highly acidic solutions to reach higher efficiencies. (futurity.org)
Electrochemical tests of the separate ingredients showed that molybdenum carbide is effective for converting H2O to H2, but not stable in acidic solution, while molybdenum nitride is corrosion - resistant but not efficient for hydrogen production. (sciencedaily.com)