Engineered bacteria made more biomass from the same feedstock—but grew more slowly

Scientists introduced and optimized a synthetic carbon-processing pathway in a bacterium that can grow using formic acid. The modified strain produced more biomass from its inputs than the natural comparison strain.

There was a clear trade-off: growth remained about half as fast. Higher yield and faster production are separate objectives, especially when a process is intended for industrial use.

The work advances an approach in which electricity first helps turn carbon dioxide into a simple chemical feedstock and microbes then make more complex products. It is a laboratory demonstration of improved biological conversion, not an operating carbon-removal industry. The result is most informative when both the gain and the remaining bottleneck are kept in view.