Navigation Links
Ecotoxicity: All clear for silver nanoparticles?
Date:2/25/2014

It has long been known that, in the form of free ions, silver particles can be highly toxic to aquatic organisms. Yet to this day, there is a lack of detailed knowledge about the doses required to trigger a response and how the organisms deal with this kind of stress. To learn more about the cellular processes that occur in the cells, scientists from the Aquatic Research Institute, Eawag, subjected algae to a range of silver concentrations.

In the past, silver mostly found its way into the environment in the vicinity of silver mines or via wastewater emanating from the photo industry. More recently, silver nanoparticles have become commonplace in many applications as ingredients in cosmetics, food packaging, disinfectants, and functional clothing. Though a recent study conducted by the Swiss National Science Foundation revealed that the bulk of silver nanoparticles is retained in wastewater treatment plants, only little is known about the persistence and the impact of the residual nano-silver in the environment.

Infiltrating the energy metabolism undercover

Smitha Pillai from the Eawag Department of Environmental Toxicology and her colleagues from EPFL and ETH Zrich studied the impact of various concentrations of waterborne silver ions on the cells of the green algae Chlamydomonas reinhardtii. Silver is chemically very similar to copper, an essential metal due to its importance in several enzymes. Because of that, silver can exploit the cells' copper transport mechanisms and sneak into them undercover. This explains why, already after a short time, concentrations of silver in the intracellular fluid can reach up to one thousand times those in the surrounding environment.

A prompt response

Because silver damages key enzymes involved in energy metabolism, even low concentrations can cut photosynthesis and growth rates by a half in just 15 minutes. Over the same time period, the researchers also detect
'/>"/>

Contact: Dr. Kristin Schirmer
kristin.schirmer@eawag.ch
Ecole Polytechnique Fdrale de Lausanne
Source:Eurekalert

Page: 1 2

Related biology news :

1. Sequencing hundreds of nuclear genes in the sunflower family now possible
2. Conserved nuclear envelope protein uses a shuttle service to travel between job sites
3. American Chemical Society podcast: Detecting radioactive material in nuclear waste water
4. Bone marrow mononuclear stem cells show no new gains in heart function says TIME study
5. Improving detection of radioactive material in nuclear waste water
6. Volume of nuclear waste could be reduced by 90 percent, says new research
7. Super-thin membranes clear the way for chip-sized pumps
8. Microfluidic platform gives a clear look at a crucial step in cancer metastasis
9. Chair Mats of Glass Company Clearly Innovative Announces the Launch of 20 New Dealers in the Midwest
10. Researchers reveal the clearest new pictures of immune cells
11. Less haze in Singapore as the cause becomes clearer and more complex
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/22/2014)... to important discoveries in basic and clinical research ... mobilized into a complex offensive spanning multiple fronts. ... chemistry lab could help find new and more ... compound that targets a specific enzyme overexpressed in ... cells from brain tumours. , Chemistry professor Christopher ...
(Date:8/22/2014)... American consumers will finally be able to purchase fuel ... as zero-emissions vehicles, most of the cars will run ... that contributes to global warming. , Now scientists at ... uses an ordinary AAA battery to produce hydrogen by ... through two electrodes that split liquid water into hydrogen ...
(Date:8/21/2014)... , Aug. 21, 2014 Nxt-ID, Inc. ... growing mobile commerce market, announced today that its shares ... stock to be issued in its proposed underwritten public ... for listing on The Nasdaq Capital Market, subject to ... common stock and warrants, and will trade under the ...
Breaking Biology News(10 mins):New enzyme targets for selective cancer therapies 2New enzyme targets for selective cancer therapies 3Stanford scientists develop a water splitter that runs on an ordinary AAA battery 2Stanford scientists develop a water splitter that runs on an ordinary AAA battery 3Nxt-ID Approved for NASDAQ Capital Market Listing 2Nxt-ID Approved for NASDAQ Capital Market Listing 3
... a paradox that,s puzzled scientists for a half-century. ... depends on those species responding differently to the availability ... species draw a blank? Competitors like black gums ... shaded understories of eastern U.S. forests, yet species-level data ...
... for the study of stem cells and to increase capacity ... initiatives announced today by NIH Director Francis S. Collins, M.D., ... Common Fund, which encourages collaborative research programs across the NIH ... single IC could do alone. The programs are all scheduled ...
... , ... ... ... , ...
Cached Biology News:Forest tree species diversity depends on individual variation 2Forest tree species diversity depends on individual variation 3Emerging science, tech advances highlight new NIH Common Fund programs 2Emerging science, tech advances highlight new NIH Common Fund programs 3Aware, Inc. Joins HIMSS10 Interoperability Showcase to Demonstrate Standards-Based Medical Image Sharing 2Aware, Inc. Joins HIMSS10 Interoperability Showcase to Demonstrate Standards-Based Medical Image Sharing 3Aware, Inc. Joins HIMSS10 Interoperability Showcase to Demonstrate Standards-Based Medical Image Sharing 4Aware, Inc. Joins HIMSS10 Interoperability Showcase to Demonstrate Standards-Based Medical Image Sharing 5Aware, Inc. Joins HIMSS10 Interoperability Showcase to Demonstrate Standards-Based Medical Image Sharing 6
(Date:8/21/2014)... & Rockville, MD (PRWEB) August 21, 2014 ... (ITI) is making progress in its development of JRC-LAMP-vax, ... Japanese red cedar pollen. Phase IC studies began this ... real solution to hay fever. , The Japanese red ... 35 million people in Japan. Mountain Cedar pollen wreaks ...
(Date:8/21/2014)... Emmetsburg, IA (PRWEB) August 21, 2014 ... Project LIBERTY Opening , The Court of His Majesty ... King will attend the Grand Opening of POET-DSM Advanced ... on Wednesday, Sept. 3. , The King will take ... formal opening activity, scheduled for 11 a.m.-12:20 p.m. and ...
(Date:8/21/2014)... 21, 2014 OTC Markets Group ... a biotechnology company, on its approval to list ... on OTCQX®, the best marketplace for established U.S. ... Logo - http://photos.prnewswire.com/prnh/20110118/MM31963LOGO ... execution of its growth strategy and achievement of ...
(Date:8/21/2014)... St. Louis, MO (PRWEB) August 21, 2014 ... premier, full service biopharmaceutical contract development and manufacturing ... selected by Progenics Pharmaceuticals, Inc., an oncology company ... targeting and treating cancer, to manufacture the anti-prostate ... Progenics’ PSMA ADC product candidate. Under the ...
Breaking Biology Technology:Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 2Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 3Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 4His Majesty Willem-Alexander, King of the Netherlands, to Attend Project LIBERTY opening 2His Majesty Willem-Alexander, King of the Netherlands, to Attend Project LIBERTY opening 3OTC Markets Group Congratulates Immune Pharmaceuticals on NASDAQ Listing 2Gallus Enters Agreement with Progenics Pharmaceuticals, Inc. for Manufacture of Anti-PSMA Monoclonal Antibody 2Gallus Enters Agreement with Progenics Pharmaceuticals, Inc. for Manufacture of Anti-PSMA Monoclonal Antibody 3
... (Amex:,SGN) has announced that the legendary Earvin "Magic" ... ambulatory heart testing with AFL,s,flagship choice, Signalife,s Fidelity ... the greatest basketball superstars of all time, Mr.,Johnson ... multiple,championships from college to the Los Angeles Lakers ...
... September 13, 2007 at the 14th, International Symposium on Hepatitis C ... ... Glasgow, Scotland, VALLEY COTTAGE, New York, September 6 XTL,Biopharmaceuticals ... a late breaker abstract, entitled "Potent Small Molecule HCV,Inhibitors Affecting NS5A-dependent ...
... They,ve gotten the science wrong. They,ve gotten the law wrong. Why ... we trust them ... Coalition for,Lifesaving Cures responded today as opponents of stem cell cures ... weeks. Said Donn Rubin, Chair of Missouri Coalition for Lifesaving ...
Cached Biology Technology:Legendary Earvin 'Magic' Johnson Joins AFL/Signalife Cardiovascular Protection Team 2Legendary Earvin 'Magic' Johnson Joins AFL/Signalife Cardiovascular Protection Team 3XTL Biopharmaceuticals Announces Presentation of Novel Pre-Clinical Inhibitors of Hepatitis C at an Upcoming International Scientific Conference 23 strikes, you're out? Refiling of Amendment to Change Constitution to Criminalize Stem Cell Cures Shows Trouble with Anti-Cures Cause 2
Phospho- (Ser) 14-3-3 Binding Motif (4E2) Mouse mAb...
Request Info...
Rabbit polyclonal to UBC12 (rating: ****) ( Abpromise for all tested applications). Antigen: Synthetic peptide: RGGYIGSTYFER, corresponding to amino acids 169-180 of UBC12 Entrez Gene ID: 90...
Applications: Beadlyte® assay Stability: 2 years at 4°C (lyophilized) or 6 months at -20°C (rehydrated) ...
Biology Products: