Navigation Links
Particle size matters to bacteria ability to immobilize heavy metals

tate, they absorb the metals. When they dissolve, they release the metals. We see that larger particles are more quickly reduced and dissolved than smaller particles."

The researchers have determined that for respiration the bacteria prefer larger nanoparticles ?about 100 nanometers ?to smaller nanoparticles (less than 20nm) of similar shape. The reasons are still under investigation.

Nanoparticles have properties that differ from larger chunks of the same material. Physicists and chemists have been trying to describe the changes in physical and chemical properties of nanoparticles for some time but little work has been done to describe the effect of nanoparticles on natural environments where they interact with microorganisms. This effort by the Virginia Tech team is addressing one component of a wider effort by various scientists led by a PNNL team in looking at the fundamental mechanisms of metal reduction by Shewanella and its application in environmental bioremediation of contaminated DOE sites. "It will help build a whole picture of Shewanella ?how it reacts with metal oxides and how the rate of this interaction is influenced by size" Bose said.

So far, the research shows that particles of similar shape but different size down to 10 nm show a 10-fold difference in bioreduction rates. Smaller nanoparticles show a lower rate of reduction than larger nanoparticles after normalized to surface area. That is, the bacteria will reduce 100 nm particles much faster than smaller particles. "This study provides the groundwork for further investigations looking into the influence of particle size in bioreduction rates of various metal oxides ," Bose said.

The talk, "Bioreduction kinetics of hematite nanoparticles by Shewanella oneidensisMR-1: Effect of size and mineralogy (GEOC 119)," will be presented at 3 p.m., Wednesday, Sept. 13, at 262 Moscone Convention Center. Authors are Bose and Hochella of the NanoGeoscience and Technology La
'"/>

Source:Virginia Tech


Page: 1 2 3

Related biology news :

1. Size matters: Preventing large mammal extinction
2. Space matters: Estimating species diversity in the fossil record
3. Bigger brain size matters for intellectual ability
4. UCSB researchers discover shape matters to macrophages
5. Researchers find that bumblebees flower choice matters
6. For Pacific white shrimp, gender matters when competing for food
7. The penalty of having a sister -- why sibling sex matters for male saiga antelopes
8. Anti-bacterial additive widespread in U.S. waterways
9. A bacterial genome reveals new targets to combat infectious disease
10. Discovery of key proteins shape could lead to improved bacterial pneumonia vaccine
11. Scientists discover that host cell lipids facilitate bacterial movement
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Particle size matters bacteria ability immobilize heavy metals

(Date:8/31/2014)... is available in French . ... just published in the prestigious Nature Neuroscience journal ... Centre of the Douglas Mental Health University Institute and McGill ... circuitry and dynamic mechanisms controlling memory as well of the ... sub-region named the subiculum. , In 2009, they developed ...
(Date:8/29/2014)... Until recently, little has been known about what ... international team of scientists, one of whom is a ... by showing that genes controlling the development of the ... rabbit domestication., The study was published Aug. 28 in ... questions. It is online at http://www.sciencemag.org/ ., The ...
(Date:8/29/2014)... type and number of connections in transcription factor networks ... in a study published in PLOS Computational Biology ... assortativity signature contributes to a network,s resilience against mutations. ... out-out assortativity of TFN models has a greater effect ... types of assortativity," said Dov A. Pechenick, PhD, lead ...
Breaking Biology News(10 mins):Memory and Alzheimer's: Towards a better comprehension of the dynamic mechanisms 2New research reveals how wild rabbits were genetically transformed into tame rabbits 2New research reveals how wild rabbits were genetically transformed into tame rabbits 3Assortativity signatures of transcription factor networks contribute to robustness 2
... map data into BiblioSphere , Genomatix Software GmbH ... Science (AAAS) today announced an agreement that allows ... Environment into Genomatix's BibliospherePE pathway knowledge base and ... journal Science, developed the Signal Transduction Knowledge Environment, ...
... of a protein, human CD38, which may lead to important ... in almost every cellular process. The findings also may offer ... to diabetes and HIV-AIDS. , Levels of the ... human CD38 a marker for these diseases. , As ...
... at the National Institute of Child Health and Human ... parasite disperses from the red blood cells it infects. ... Development is one of the Institutes comprising the National ... September 20 Current Biology. , "This discovery provides the ...
Cached Biology News:Genomatix, AAAS ink agreement 2Protein structure key for AIDS, cell function 2Researchers discover how malaria parasite disperses from red blood cells 2Researchers discover how malaria parasite disperses from red blood cells 3
(Date:8/28/2014)... Aug. 28, 2014   SunTrust Robinson Humphrey ... veterans to its equity research team in biotechnology ... expansion in equity research demonstrates our commitment to ... to enhance their investment decision making," said ... "We continue to make significant investments in differentiated ...
(Date:8/28/2014)... , Aug. 28, 2014  Armetheon, Inc. ( ... novel mid- to late-stage cardiovascular drug candidates, today ... its first round of financing. The Series A ... Hercules Bioventures with participation from investors that included ... executive, Dr. Larry Hsu , the founder ...
(Date:8/28/2014)... Washington, USA (PRWEB) August 27, 2014 ... next month for SPIE Laser Damage 2014 ... optical materials for high-power lasers will run 14-17 September. ... society for optics and photonics . , The premier ... for understanding laser damage to optical materials will engage ...
(Date:8/28/2014)... 2014 Earlier this month, a ... partnership with the U.S. Air Force on the performance ... indicated that this type of fuel made from mustard ... be important to America’s Eco friendly future. In fact, ... mandate to become independent of foreign oil over the ...
Breaking Biology Technology:SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 2SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 3Armetheon Completes $7.0 Million Series A Financing 2Armetheon Completes $7.0 Million Series A Financing 3Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 2Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 3Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 2Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 3Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 4Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 5
... Software Inc., the leading,provider of web-based employee ... independent research firm Bersin & Associates ranked,Halogen ... its recent report on talent,management vendors. Halogen ... product strength, architecture and customer satisfaction., ...
... BioSeek, Inc. today,announced that Roy A. Whitfield ... of directors. Mr. Whitfield had joined BioSeek,s board ... the Company since November,2005., "Roy,s management experience ... been extraordinarily valuable to BioSeek thus,far. We look ...
... - Oncothyreon Inc. (Nasdaq:,ONTY) (TSX: ONY), a biotechnology ... for the treatment of cancer, today,announced the launch ... ., "We are excited about our new ... which provides additional information about our,product pipeline and ...
Cached Biology Technology:Halogen Receives High Ratings from Bersin & Associates - Company recognized as a market leader, and receives praise for outstanding customer satisfaction 2BioSeek Elects Roy Whitfield Executive Chairman of Board of Directors 2
... cyclin required for G1-phase progression and is ... cyclin D2 can phosphorylate pRB when associated ... Human, Mouse, and Rat. Others-not tested. ... suited for neutralization of cyclin D2 activity ...
Mouse Anti-Human Methyl-CpG binding domain protein 2 (MBD2 Monoclonal Antibody Family: Other Applications: Western Blot...
... Synthetic peptide corresponding ... Antigen Family: ... Antigen Subfamily: not ... Recommended Storage: Long ...
V beta 5 Purified Anti-Human clone MH3-2, Isotype Mouse IgG 2a , kappa, 0.1 mg Consult technical datasheet for details....
Biology Products: