Navigation Links
Lawrence Livermore helps find link to arsenic-contaminated groundwater
Date:3/4/2013

Human activities are not the primary cause of arsenic found in groundwater in Bangladesh.

Instead, a team of researchers from Lawrence Livermore National Laboratory, Barnard College, Columbia University, University of Dhaka, Desert Research Institute and University of Tennessee found that the arsenic in groundwater in the region is part of a natural process that predates any recent human interaction, such as intensive pumping.

The results appear in the March 4 edition of the Proceedings of the National Academy of Sciences.

Millions of people in Bangladesh and neighboring countries are chronically exposed to arsenic-contaminated groundwater, which causes skin lesions and increases the risk of certain cancers. Bacterial respiration of organic carbon releases naturally-occurring arsenic from sediment into groundwater, but the source of this organic carbon remains unclear.

Brian Mailloux of Barnard College and his team isolated microbial DNA from several depth intervals in arsenic-contaminated aquifers in Bangladesh and analyzed the DNA's radiocarbon signature, which reflects whether the organic carbon used by the microbes derives primarily from younger, surface-derived sources that are transported by groundwater into the aquifers, or older, sediment-derived sources.

Using "bomb pulse" radiocarbon analysis, Lawrence Livermore scientist Bruce Buchholz dated the DNA of groundwater bacteria. He found that the DNA samples were consistently younger than the sediment, suggesting that the microbes favor using surface-derived carbon.

The surface-derived carbon has flowed into the aquifer over hundreds to thousands of years -- a rate that is approximately 100 times slower than groundwater flow. The results suggest that recent human activities, such as intensive groundwater pumping, have not yet significantly affected the release of arsenic into the groundwater at this site.

Above-ground testing of nucl
'/>"/>

Contact: Anne Stark
stark8@llnl.gov
925-422-9799
DOE/Lawrence Livermore National Laboratory
Source:Eurekalert

Page: 1 2

Related biology news :

1. The American Society for Microbiology honors Lawrence Corey
2. Protein jailbreak helps breast cancer cells live
3. Newly found protein helps cells build tissues
4. New iPad, iPhone app helps mariners avoid endangered right whales
5. University of Minnesota invention helps advance reliability of alternative energy
6. New analysis helps guide use of erlotinib in advanced non-small cell lung cancer
7. Gene signature helps identify risk of relapse in lung cancer patients
8. Clinical trial launches to see whether vitamin D helps treat multiple sclerosis
9. Scripps research scientists find anticonvulsant drug helps marijuana smokers kick the habit
10. New musical pacifier helps premature babies get healthy
11. Worlds largest release of comprehensive human cancer genome data helps speed discoveries
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/7/2014)... led by Dr. Debra Auguste, associate professor, biomedical ... The City College of New York, have identified ... for one of the most aggressive forms of ... have a high mortality rate owing to aggressive ... therapeutic options. However, Professor Auguste,s team, discovered the ...
(Date:11/6/2014)... for a predator. Except when that predator runs so fast ... to its size, is the fastest creature on Earth. Some ... second (at about five miles per hour). The fastest human ... gold from the tiger beetle, a person would have to ... has a problem. At peak speeds, everything becomes a blur. ...
(Date:11/4/2014)... LAKE CITY, Nov. 5, 2014 – University of Utah ... enzymes to help jet fuel produce electricity without needing ... be used to power portable electronics, off-grid power and ... online today in the American Chemical Society journal ... electricity through a chemical reaction between a fuel and ...
Breaking Biology News(10 mins):The tiger beetle: Too fast to see 2Jet-fueled electricity at room temperature 2
... nature or nurture determines an ant,s status in the ... Nature (that is, the ant,s genetic makeup) and nurture ... determining the fate of the Florida harvester ant, Pogonomyrmex ... the southeastern United States. The research team included ...
... in three U.S. public schools are in the "air ... University of Cincinnati (UC). UC researchers have ... schools are within 400 meters, or a quarter mile, ... and traffic routes. Research has shown that ...
... found in biology. Now, chemists have succeeded in making ... surface, much like miniature bedsprings in a frame. This ... can help researchers develop molecular electronics or solar cells, ... Physical chemists at the Department of Energy,s Pacific Northwest ...
Cached Biology News:Genes and nutrition influence caste in unusual species of harvester ant 2Genes and nutrition influence caste in unusual species of harvester ant 3Many US public schools in 'air pollution danger zone' 2Many US public schools in 'air pollution danger zone' 3Chemists make beds with soft landings 2Chemists make beds with soft landings 3
(Date:11/24/2014)... USA (PRWEB) November 23, 2014 One of ... field of optics and photonics is now available to high ... very low cost. SPIE, the international society for optics ... to the complete SPIE Digital Library available to ... price. , “Light-based technologies are integral to all areas of ...
(Date:11/24/2014)... , Nov. 24, 2014  Spherix Incorporated ... company committed to the fostering and monetization of ... v. VTech Telecommunications Ltd.,  Case No. 3:13-cv-03494-M and  ... No. 3:13-cv-03496-M, both in the United States District ... Texas . On November ...
(Date:11/22/2014)... (PRWEB) November 21, 2014 During his ... understood the need to surround himself with great people ... and entrepreneur, his friends often marveled at his extraordinarily ... lived his life and -- even with his death ... the Alzheimer’s disease that would ultimately take his life. ...
(Date:11/22/2014)... 2014 On November 17th Chicago start-up ... Emerging Medical Technologies Summit in San Francisco to take ... regarded among Silicon Valley investors and technology elites as ... win also positions Briteseed to move on to ... 2015 and compete with other elite innovation finalists for ...
Breaking Biology Technology:SPIE Digital Library Now Available to High Schools, Two-Year Colleges at No or Low Cost 2Markman Hearing Held as Scheduled in VTech and Uniden Cases 2Sherry Sharp, Wife of CarMax Founder, Richard Sharp, Accepts Seat on Board of Cure Alzheimer’s Fund 2Sherry Sharp, Wife of CarMax Founder, Richard Sharp, Accepts Seat on Board of Cure Alzheimer’s Fund 3Insight Product Development Accelerator Member Wins MedTech Innovator Award Competition 2Insight Product Development Accelerator Member Wins MedTech Innovator Award Competition 3
... which examines the science and applications of invisibility, Martin McCall ... type of invisibility cloak that does not just hide objects ... an example, McCall and Kinsler explain how a thief could, ... a safe, without even the CCTV surveillance cameras being aware. ...
... Corporation (Nasdaq: DNDN ) today announced ... use of PROVENGE® (sipuleucel-T), the first autologous cellular ... symptomatic metastatic castrate resistant (hormone refractory) prostate cancer ... Food and Drug Administration (FDA) approved the Los ...
... Calif., June 30, 2011 OXIS International, Inc. (OTC Bulletin ... that it has named David Saloff to its Board of ... independent Directors. "We are very pleased to have ... OXIS International Board of Directors," said Anthony J. Cataldo, Chairman ...
Cached Biology Technology:Why 'event cloaks' could be the key to the ultimate bank heist 2Dendreon Announces Increased Capacity and Significant Reimbursement Decisions Supporting Broad Availability of PROVENGE 2Dendreon Announces Increased Capacity and Significant Reimbursement Decisions Supporting Broad Availability of PROVENGE 3Dendreon Announces Increased Capacity and Significant Reimbursement Decisions Supporting Broad Availability of PROVENGE 4OXIS International Names Healthcare Industry Entrepreneur David Saloff to Board of Directors 2OXIS International Names Healthcare Industry Entrepreneur David Saloff to Board of Directors 3
PMM2 Immunogen: PMM2 (NP_000294, 47 a.a. ~ 112 a.a) partial recombinant protein with GST tag. Storage: -20 C, Avoid Freeze/Thaw Cycles *Available for distribution in the US only...
Anti-MMP-14, catalytic domain, clone LEM-2/15.8 Immunogen: Synthetic peptide: amino acid sequence 218-233 within the catalytic domain Available Date: 38579...
KRIT1 Immunogen: KRIT1 (NP_004903, 637 a.a. ~ 737 a.a) partial recombinant protein with GST tag. Storage: -20 C, Avoid Freeze/Thaw Cycles *Available for distribution in the US only...
Evolutionarily conserved signaling intermediate in Toll pathway...
Biology Products: