Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Study uncovers bacteria’s worst enemy

15.04.2005


University of California scientists working at Los Alamos National Laboratory have found that the successful use of bacteria to remediate environmental contamination from nuclear waste and processing activities may depend more upon how resistant the bacteria are to chemicals than to how tolerant they are to radioactivity. The results of a recent Laboratory study may help make bacterial bioremediation a more widespread method for cleaning up sites contaminated with actinides and other radionuclides.

In research published in the journal Environmental Microbiology, Laboratory chemist Mary Neu and her colleagues describe their study of different naturally occurring bacteria used to treat actinide contamination. Actinides are the elements above atomic number 89 and are usually radioactive. The study’s results indicate that actinide toxicity is primarily chemical, rather than radiological, and so a bacteria’s resistance to radiation does not necessarily ensure a tolerance for radionuclides. In fact, the bacteria’s worst enemy in a nuclear waste site may not be the radioactive elements, but rather, the other toxic metals that might also be found at the site.

The study also shows that contrary to the conventional wisdom, when it comes to these environmental bacteria, plutonium is less toxic than uranium and, in general, actinides are less toxic than other types of metals. This suggests that actinide toxicity will not impede bioremediation using naturally occurring bacteria.



"This study" said Neu, "is exciting because even though we’ve known for years that bacterial bioremediation can be a preferred method for cleaning up actinide contamination, we’ve never really known whether or not radioactivity or chemical toxicity will stifle the process. Our study found that actinides are chemically toxic to bacteria only at high levels far, far above concentrations at contaminated sites, and that common toxic metals, such as cadmium, nickel, and chromium, are more likely to cause problems for the bacteria."

Generally, bacteria used for bioremediation are selected to target a specific form and oxidation state of toxic pollutants, such as soluble hexavalent uranium carbonate for uranium contamination. However, a single chemical rarely contaminates soils and groundwater and combinations of actinides, radionuclides, organic chemicals and metal regularly exist at many nuclear sites. Based on the results of this study, if bioremediation is to be effective at these types of sites, the operative microorganisms must be able to grow, function and do better than other bacteria in the presence of all kinds of contaminants.

The study examined the effects of toxicity of actinides, metals and chelators on different bacteria being evaluated for radionuclide bioremediation, Deinococcus radiodurans and Pseudomonas putida, along with the toxicity of plutonium on the bacteria Shewanella putrefaciens.

In addition to Neu, the bacteria bioremediation study team includes Christy Ruggiero and Hakim Boukhalfa of the Chemistry Division, and Joseph Lack and Larry Hersman from the Laboratory’s Bioscience Division.

Los Alamos National Laboratory is operated by the University of California for the National Nuclear Security Administration of the U.S. Department of Energy and works in partnership with NNSA’s Sandia and Lawrence Livermore national laboratories to support NNSA in its mission.

Los Alamos enhances global security by ensuring the safety and reliability of the U.S. nuclear deterrent, developing technologies to reduce threats from weapons of mass destruction, and solving problems related to defense, energy, environment, infrastructure, health and national security concerns.

Todd Hanson | EurekAlert!
Further information:
http://www.lanl.gov

More articles from Studies and Analyses:

nachricht WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf

nachricht First form of therapy for childhood dementia CLN2 developed
25.04.2018 | Universitätsklinikum Hamburg-Eppendorf

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

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

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Research reveals how order first appears in liquid crystals

23.05.2018 | Life Sciences

Space-like gravity weakens biochemical signals in muscle formation

23.05.2018 | Life Sciences

NIST puts the optical microscope under the microscope to achieve atomic accuracy

23.05.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>