http://www.bbc.com/future/story/20130524-zapping-bacteria-the-wireless-way
Professor John Rogers of the University of Illinois has created bio-absorbable electronic circuits which could be implanted into wounds and powered wirelessly to destroy bacteria during healing before dissolving harmlessly into body fluids once their job is done. Rogers and others have previously reported biodegradable flexible circuits and electronic devices that can be safely laid directly onto skin. But their success in making their circuits wireless could prove crucial to many potential applications, especially in medicine.
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