Uses for Ear Hair

Saturday, February 17, 2007
Ear-hair powered space-suits

NASA is investigating the use of a protein found in human ear-hair as a means of powering space suits. The protein converts motion into electrical energy -- and if it's augmented with an electricity-conducting microbe, it could form self-healing, semi-living "skins" that convert Martian wind and even the jogging and walking of astronauts into juice.

They are focusing on a protein called prestin, which is found in the outer hair cells of the human ear. In the cell membranes of these cells, prestin converts electrical voltage into motion, elongating and contracting the cell. This movement amplifies sound in the ear.

However, prestin can also work in reverse, producing electrical charges in response to mechanical stresses, such as tiny vibrations. Each protein is only capable of making nanowatts of electricity, but Matthew Silver and Kranthi Vistakula, both of IntAct Labs, believe that many proteins used together may be able to power small devices or help charge a battery...

But eventually, they say networks of the proteins could form 'power skins' to coat spacesuits, so that the astronauts' natural movement would be able to generate power for their equipment. The skins could also wrap around buildings on the Red Planet, where gusts of wind would activate prestin.