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Forward Thinking Pest Control

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Forward Thinking Pest Control

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Biofuel Cells May Turn Cockroaches into Cyborgs

The sugars in a cockroach's belly have been harnessed by a fuel cell and converted into electricity, a big step toward turning insects into cyborgs, scientists are reporting.

Once miniaturized to the point that the fuel cells are non-invasive to the cockroaches, they can be implanted to power sensors or recording devices, for example.

A rechargeable battery inserted along with the so-called biofuel cell would store the trickle of energy it generates, explained Daniel Scherson, a chemist at Case Western Reserve University in Cleveland.

"If you want to be futuristic, one may use the energy stored to try to control the neurological system of the cockroach and then you might be able to (control) the cockroach (with) a joystick," he told me.

Yes, in the future, that nasty cockroach scurrying across the kitchen floor might actually be a spy set loose by a nosy neighbor, or the CIA.

Sugar Fuel

The power supply for this fuel cell is food the cockroaches eat, avoiding the need for devices that harness electricity from movement, such as shoes that turn mechanical energy into electricity.

The fuel cell devised by Scherson's team uses a cascade of reactions by enzymes to convert energy stored as sugars into electricity.

The first enzyme breaks down the sugar trehalose, which cockroaches constantly produce from their food, into two simpler sugars.

A second enzyme oxidizes the simple sugars, releasing electrons that "can then be funneled together to electrodes where they are captured and delivered to oxygen," Scherson explained.

The team first tested the system on trehalose solutions, then inserted prototype electrodes into the belly of a female cockroach. It worked.

The biofuel cell produced a trickle of electricity — 0.2 volts. Full details on the system are published online in the Journal of the American Chemical Society.

Intermittent Tasks

Since the researchers don't want to load down a bug with a heavy fuel cell and impair its ability to move, they envision storing the energy up in a battery, then using that energy to perform tasks such as power sensors.

One potential application is to equip social insects such as bees or ants with sensors tuned to detect a dangerous chemical and send them out to the environment.

Periodically, the sensor would turn on and broadcast its finding, shutting down between broadcasts to allow the battery time to recharge.

Operating at 0.2 volts is enough power to send a message a few inches, according to Scherson, far enough that a message could be sent down a line of ants spying on a top-secret meeting in a park.

To get there, the researchers need to shrink their fuel cells so they can be fully implanted, find long-lasting materials to make them with so they don't breakdown inside the bugs' bodies, and build the signal transmitters.

All of this is in the realm of possibility, noted Scherson.

"People do wonderful things with circuitry."

George Williams,
General Manager - Staff Entomologist

Pest Control, RI, Pest Control, MA 


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