Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists decode DNA of bacterium that cleans up uranium contamination and generates electricity

12.12.2003


Department of Energy-funded researchers have decoded and analyzed the genome of a bacterium with the potential to bioremediate radioactive metals and generate electricity. In an article published in the December 12th issue of Science, researchers at The Institute for Genomic Research (TIGR) and the University of Massachusetts, Amherst, report that Geobacter sulfurreducens possesses extraordinary capabilities to transport electrons and "reduce" metal ions as part of its energy-generating metabolism.



"The genome of this tiny microorganism may help us to address some of our most difficult cleanup problems and to generate power through biologically-based energy sources," Secretary of Energy Spencer Abraham said. "Geobacter is an important part of Nature’s toolbox for meeting environmental and energy challenges. This genome sequence and the additional research that it makes possible may lead to new strategies and biotechnologies for cleaning up groundwater at DOE and at industry sites."

The contamination of groundwater with radionuclides and metals is one of the most challenging environmental problems at Department of Energy former nuclear weapons production sites. Researchers at the University of Massachusetts have previously found that Geobacter species can precipitate a wide range of radionuclides and metals (including uranium, technetium and chromium) from groundwater, preventing them from migrating to wells or rivers where they may pose a risk to humans and the environment.


The analysis of the genome sequence revealed a number of capacities that had not been previously suspected from past research on this microbe. "We’ve provided a comprehensive picture that has led to fundamental changes in how scientists evaluate this microbe," said Barbara Methe, the TIGR researcher who led the genome project and is the first author of the Science paper. "Research based on genome data has shown that this microbe can sense and move towards metallic substances, and in some cases can survive in environments with oxygen." G. sulfurreducens was previously thought to be an anaerobic organism.

The other main project collaborator was Derek Lovley, a professor of microbiology at the University of Massachusetts, Amherst, who discovered the Geobacter family of bacteria and has led projects to assess their biology and their potential for bioremediation. Lovley said, "Sequencing the genome of Geobacter sulfurreducens has radically changed our concepts of how this organism functions in subsurface environments." The genome analysis, he said, "revealed previously unsuspected physiological properties" of the bacterium and also gave scientists insight into the metabolic mechanisms that the organism uses to harvest energy from the environment.

Geobacter reduces metal ions in a chemical process during which electrons are added to the ions. As a result, the metals become less soluble in water and precipitate into solids, which are more easily removed. Small charges of electricity are also created through the reduction process. Geobacter is also of interest to the Department of Energy because of its potential to create an electrical current in a "bio-battery."

Geobacter microbes are widely distributed in nature and are commonly found in subsurface environments contaminated with radionuclides and metals. Researchers have demonstrated that if they "feed" the microbes simple carbon sources such as acetate they will grow faster and precipitate more radionuclides and metals. These findings are now serving as the basis for a test of a bioremediation strategy aimed at removing uranium from groundwater at a Uranium Mill Tailings Remedial Action site near Rifle, Colorado.

The Natural and Accelerated Bioremediation Research (NABIR) and Microbial Genome Programs in the department’s Office of Science funded the $800,000 G. sulfurreducens sequencing project. The genome sequence is now serving as the basis for detailed investigations, supported by the department’s Genomes to Life program, into the ability of Geobacter to reduce radionuclides and metals and to generate electricity. The NABIR program’s mission is to provide the fundamental science that will serve as the basis for development of cost-effective bioremediation and long-term stewardship of radionuclides and metals in the subsurface at DOE sites. The focus of the program is on strategies leading to long-term immobilization of contaminants in place to reduce the risk to humans and the environment. The NABIR program encompasses both intrinsic bioremediation by naturally occurring microbial communities, as well as accelerated bioremediation through the use of biostimulation -- addition of inorganic or organic nutrients. More information on NABIR is available at www.lbl.gov/NABIR and on the Microbial Genome Program at http://doegenomes.org.


DOE’s Office of Science is the single largest supporter of basic research in the physical sciences in the nation, manages 10 world-class national laboratories and builds and operates some of the nation’s most advanced R&D user facilities. Its web site address is www.science.doe.gov.

More detailed information on the Science article is available in news releases issued by TIGR and the University of Massachusetts. To obtain those releases, visit www.eurekalert.org or contact those institutions’ press offices.

Robert Koenig (TIGR), 301-838-5880
Daniel Fitzgibbons (UMass), 413-545-0444

Jeff Sherwood | EurekAlert!
Further information:
http://www.science.doe.gov

More articles from Power and Electrical Engineering:

nachricht Nano-scale process may speed arrival of cheaper hi-tech products
09.11.2018 | University of Edinburgh

nachricht Nuclear fusion: wrestling with burning questions on the control of 'burning plasmas'
25.10.2018 | Lehigh University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

Im Focus: Coping with errors in the quantum age

Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly

The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Epoxy compound gets a graphene bump

14.11.2018 | Materials Sciences

Microgel powder fights infection and helps wounds heal

14.11.2018 | Health and Medicine

How algae and carbon fibers could sustainably reduce the athmospheric carbon dioxide concentration

14.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>