2009年11月18日星期三

for your Bacteria Battery

Those electronic gadgets on many shoppers' holiday lists seem to be getting more and more high tech, but they still run on old-fashioned batteries.Sony laptop battery As this ScienCentral News video reports, instead of ending up in the trash, the batteries on your future shopping list may run on trash.


A New Kind Of Battery


For some time scientists have been interested in toshiba tecra a8 battery figuring out ways to put waste materials and garbage to work by converting the trash into electricity.Sony VGP-BPL2 Battery, Sony VGP-BPS3 Battery, Sony VGP-BPS5 Battery, Now a team of researchers at the University of Massachusetts–Amherst has discovered a new bacteria that can do just that and run a new kind of battery.


“At its present status we can run simple electronic equipment such as a calculator or a very small light bulb,” says Derek Lovley, an environmental microbiologist who led the research.


The micro-organism, Rhodoferax ferrireducens, feeds on simple sugars like sucrose, fructose and glucose, which are found in such things as fruits, beets and sugar cane. It will also feed on xylose—a part of wood and straw—and as long as it has a food source the microbe is self-sustaining,Lovley brought the micro-organism, found in sediment from a Virginia aquifer, back to his lab and designed a simple two-compartment fuel cell. “The way the battery functions—it’s basically a solution of sugar, just like the table sugar you would put on your cereal,” says Lovley. “It’s in water, we dip [an electrode] in that sugar solution… and add these micro-organisms. The micro-organisms attach onto the electrode surface and start to grow by using that sugar.Sony VGP-BPS3 Battery And at the same time they are growing and metabolizing the sugar, they are transferring electrons onto the electrode surface, producing electricity pcga-bp2nx ,pcga-bp2ny."


Surprising Results


What this micro-organism could do surprised Lovley and his team. “I think the fact that micro-organisms could carry out this kind of process was pretty amazing and not expected”, says Lovley. “Because for micro-organisms to accomplish this electricity formation, they have to transfer the electrons outside their cell and that’s just not something most life forms are able to do.”


R. ferrireducens belongs to a group of recently discovered micro-organisms known as “iron-breathers” —so-named because they evolved the strategy of iron respiration. Found in sediment where oxygen is scarce, they use iron for metabolic energy just as humans use oxygen to burn food.


Many research groups have been pursuing a useable biofuel cell that is powered by microbes, but have been vexed by low returns and the need for additional toxic compounds to make the reaction work. Lovley’s bacteria does the work all by itself gk479,fk890,Sony VGP-BPL2 Battery, Sony VGP-BPS3 Battery, Sony VGP-BPS5 Battery, dell inspiron 1520 battery , dell inspiron 1521 battery.


“Our process does not require the addition of any toxic chemicals in order to help the electrons get transferred from the micro-organism to the electrode,” says Lovely.


Next Steps


Lovley sees this as another possible and practical solution for generating energy from alternative fuel sources, Sony VGP-BPS5 Battery but points out that there is still a lot of work to be done. “I think it’s important to realize that we’ve now just proved the concept. There’s certainly a lot of engineering to go into developing this for commercial application, but it’s a fairly neat thing to see that you can just use a micro-organism in this way for some practical benefit.”


Lovley hopes that his “bacterial battery” may one day have many uses, like powering sensors in remote places where it's difficult to change traditional batteries, or in household devices, where one could convert grass clippings into power for an electric lawn mowerdell inspiron 1720 battery , dell inspiron 1721 battery

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