Sánchez’s team created two sizes of bots made of silicon dioxide : nanoparticles and slightly larger microparticles. They used a protein called urease to propel those chassis. Urease is an enzyme that turns the body’s urea into ammonia and carbon dioxide. Like a car’s engine, that enzyme turns a chemical reaction into mechanical energy; urea is its fuel.
Next, they proved that the bots could swim. In test tubes containing urea, the microbots reached speeds of up to 4 micrometers per second—“one or two body lengths per second,” says Sánchez. Next, a separate set of mice received thousands of antimicrobial bots administered in a tiny droplet. Some mice got bots loaded with LL-37, some got bots with K7-Pol. The team covered each wound with some nontoxic urea, expecting the bots would gobble the fuel and cover more ground.
This is brillant. Actually using proteins as propellent is a break throu. There are also interesting researches about using bacteria as carriers, who are sensitive to magnetic fields. Imagine driving them using a modulated MRI. A world of possibilities for infection, cancer...
Hear me out, it's called 'an immune system'
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