Engineered E. coli seeks out and destroys invaders without harming helpful bacteria.
”[…] The researchers programmed their E. coli so that it cunningly keeps its powder dry until it is close to its mark. It can detect a P. aeruginosa messenger molecule used for a process called quorum sensing, by which the invader assesses its own population density. Each E. coli generates a protein that latches on to a quorum-sensing molecule, forming a complex that activates its weapons systems. […]” Nature news author: Mark Peplow.
Read more Engineered bacterium hunts down pathogens : Nature News & Comment.
Photo of coloured TEM of E.coli by Dr Linda Stannard from: fineartamerica.com