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:7/30/2014)... black truffle uses reversible epigenetic processes to regulate its ... ,methylome, - a picture of the genome regulation taking ... access journal Genome Biology and illustrates how ... and ,jumping genes,. The authors say this may shed ... controlled. , Black truffles (Tuber melanosporum), also known as ...
(Date:7/30/2014)... protected and tended her eggs until they hatched 4.5 ... 2014 in the open-access journal PLOS ONE ... and colleagues. , Octopuses typically have a single reproductive ... take care of their fertilized eggs until they hatch. ... to 3 months, but little is known about the ...
(Date:7/30/2014)... effects of climate change on the world,s animal ... factors, according to a new paper by a ... of Queensland, and other organizations. The authors claim ... the point when it comes to climate change. ... scientists focus on the "direct" threats of changing ...
Breaking Biology News(10 mins):How black truffles deal with the jumpers in their genome 2Deep-sea octopus has longest-known egg-brooding period 2Conservation scientists asking wrong questions on climate change impacts on wildlife 2
... and spend enormous resources on the conservation of endangered ... One big problem is international legislation and the need ... networks. Zoo resources can be spent much more effectively, ... animal collections across the world,s zoos. Many zoos ...
... and, in most cases, they have evolved a "circadian clock". ... has been shown to have important metabolic consequences for the ... on health; for example lack of sleep is linked with ... the ability to control body weight. Scientists from the ...
... Cell Research (ISSCR) has announced the following 2014 award ... Annual Meeting in Vancouver, taking place June 18-21, 2014: ... Research UK Gurdon Institute, for the McEwen Award for ... Yale Stem Cell Center, for the ISSCR-BD Biosciences Outstanding ...
Cached Biology News:Scientists warn: Conservation work in zoos is too random 2Scientists warn: Conservation work in zoos is too random 3The internal clock and feeding rhythm set the pace of the liver 2The International Society for Stem Cell Research announces its 2014 award recipients 2The International Society for Stem Cell Research announces its 2014 award recipients 3
(Date:7/31/2014)... July 31, 2014 Boston’s Adult Stem ... flush with innovative adult stem cell biotechnologies. Currently ... and has three additional patent applications currently under examination ... patented inventions address two of the most vexing problems ... Adult stem cells are difficult to identify; and ...
(Date:7/30/2014)... July 30, 2014 Regulus Therapeutics Inc ... leading the discovery and development of innovative medicines targeting ... and highlights for the quarter ended June 30, 2014 ... markets close. Regulus will host a ... at 5:00 pm Eastern Daylight Time to discuss its ...
(Date:7/30/2014)... 30, 2014 W. R. Grace ... of the REVELERIS® Prep purification system , ... chromatographers, and other researchers to perform both flash ... unit. , With the REVELERIS® Prep purification system, ... chromatography modes with a simple touch of the ...
(Date:7/30/2014)... A study presented at the 2014 ... of CSL Behring,s C1 Inhibitor (C1-INH) concentrate in ... sensitized patients. C1-INH is a human protein and ... The study shows that post-transplant treatment with ... of complement components 3 and 4, suggesting that ...
Breaking Biology Technology:The Adult Stem Cell Technology Center, LLC Launches A Marketing Campaign To License Adult Stem Cell Biotechnologies 2The Adult Stem Cell Technology Center, LLC Launches A Marketing Campaign To License Adult Stem Cell Biotechnologies 3Regulus Announces Timing for Second Quarter 2014 Financial Results Webcast and Conference Call 2Regulus Announces Timing for Second Quarter 2014 Financial Results Webcast and Conference Call 3Grace Launches New REVELERIS® Prep Purification System 2Study Suggests C1-INH May Aid in Prevention of Antibody-Mediated Rejection Following Kidney Transplant 2Study Suggests C1-INH May Aid in Prevention of Antibody-Mediated Rejection Following Kidney Transplant 3
... long-term promise, non-invasive techniques can also provide effective ... in the brain for paralyzed patients with significantly ... applications for healthy users. However, two issues hamper ... on non-invasive recording techniques, such as electroencephalography (EEG). ...
... IRVINE, Calif., Aug. 12 ChromaDex,Corporation, (OTC Bulletin ... contract research, today announced financial results for the,second ... in accordance with,U.S. Generally Accepted Accounting Principles (GAAP), ... of $0.03 per share for the,three months ended ...
... ST. LOUIS, Aug. 12 At the Board ... quarterly cash dividend of,$.13 per share. The dividend ... record on September 2, 2008., About Sigma-Aldrich: ... company. Our biochemical and organic chemical products and ...
Cached Biology Technology:ChromaDex Announces Second Quarter 2008 Financial Results 2ChromaDex Announces Second Quarter 2008 Financial Results 3