Skip to Main Content

Latest News

Advertisement
Advertise Here
August 30, 2010
Volume 88, Number 35
p. 25

Bacteria Create Electrical Spikes

ACS Meeting News: Microbe behavior could be akin to neuron firing

Jyllian N. Kemsley

  • Print this article
  • Email the editor

Latest News



October 28, 2011

Speedy Homemade-Explosive Detector

Forensic Chemistry: A new method could increase the number of explosives detected by airport screeners.

Solar Panel Makers Cry Foul

Trade: U.S. companies complain of market dumping by China.

Novartis To Cut 2,000 Jobs

Layoffs follow similar moves by Amgen, AstraZeneca.

Nations Break Impasse On Waste

Environment: Ban to halt export of hazardous waste to developing world.

New Leader For Lawrence Livermore

Penrose (Parney) Albright will direct DOE national lab.

Hair Reveals Source Of People's Exposure To Mercury

Toxic Exposure: Mercury isotopes in human hair illuminate dietary and industrial sources.

Why The Long Fat?

Cancer Biochemistry: Mass spectrometry follows the metabolism of very long fatty acids in cancer cells.

Text Size A A

Bacteria exhibit spontaneous electrical spiking behavior that may be similar to neuron firing, reported Harvard University's Adam E. Cohen on Monday at the ACS national meeting in Boston.

Cohen and colleagues were working with proteorhodopsin, a protein that turns sunlight into energy in some microbes by moving a proton from one side of the cell membrane to the other. Ion transport across membranes creates a membrane potential, or a difference in voltage between the outside and inside of a cell. The researchers were trying to engineer the protein to essentially run in reverse--to change its fluorescence emission in response to a change in cellular voltage--as a means to image electrical activity in neurons.

They succeeded. When they initially expressed the mutated protein in Escherichia coli, they observed the proteins flashing on and off "a little bit like fireflies," Cohen said. Some flashed periodically and some irregularly; some lit up for longer and some for shorter periods of time.

Cohen's use of proteorhodopsin is "a very interesting modality for how to observe the state of a cell," says Ed Boyden, a neurobiologist at Massachusetts Institute of Technology. As for the electrical activity in bacteria, that could be a previously unrecognized form of bacterial signaling, he says.

Cohen and colleagues are now trying to pin down the source and purpose of the bacterial voltage fluctuations. They are also working to express the protein in eukaryotic cells for neuron imaging.

Chemical & Engineering News
ISSN 0009-2347
Copyright © 2011 American Chemical Society
  • Print this article
  • Email the editor

Services & Tools

ACS Resources

ACS is the leading employment source for recruiting scientific professionals. ACS Careers and C&EN Classifieds provide employers direct access to scientific talent both in print and online. Jobseekers | Employers

» Join ACS

Join more than 161,000 professionals in the chemical sciences world-wide, as a member of the American Chemical Society.
» Join Now!