Biofuel: a hot topic for doctors seeking to implant pacemakers and other life-saving devices inside the body without the need for batteries that would need to be changed every couple of years, or months, or even week. Now researchers at Case Western Reserve University have possibly found the answer in one of our least favourite creepy crawlies: the cockroach.Using enzymes in series at the anode, the researchers have developed a chemical energy-converting fuel cell that creates a maximum power density output of nearly 100 microwatts per square centimetre at 0.2 volts.
The enzyme trehalase is the first in the line, breaking down the sugar trehalose, which is in constant production in a cockroach. The trehalose is broken down into simpler sugars (called monosaccharides), and a second enzyme oxidizes those, releasing electrons. The cathode draws the electrons, at which point oxygen is reduced to water by these electrons.
Difficulties with the first enzyme caused a year long delay in the research, but after the study’s five long years, pushing through the problems has been worth it.
Inserting electrodes into the blood sinus of a female cockroach left the insect pretty much unharmed, ready to scuttle off into the dark corners of your house to wait till you fall asleep. With no long-term damage, it seems there’s no ethical debate about implanting the little critters with electronics
http://www.geeksaresexy.net
