Navigation Links
Is nanosilver toxic?
Date:2/28/2013

silver salt. However, more research is required to reach a clear understanding of the safety of silver-containing particles," Niskanen says.

Indeed, silver nanoparticles were found to be ten times less toxic than the soluble silver nitrate a soluble silver salt used for the comparison.

The bioavailability of silver varies in different test media

To explain this phenomenon, the researchers refer to the variance in the bioavailability of silver to crustaceans in different tested media.

University lecturer Olli-Pekka Penttinen from the Department of Environmental Sciences of the University of Helsinki goes on to note that the inorganic and organic compounds dissolved in natural waters (such as humus), water hardness and sulfides have a definite impact on the bioavailability of silver. Due to this, the toxicity of both types of tested nanoparticles and the silver nitrate measured in the course of the study was lower in natural water than in artificial fresh water.

The toxicity of silver nanoparticles and silver ions was studied using two aquatic crustaceans, a water flea (Daphnia magna) and a fairy shrimp (Thamnocephalus platyurus). Commercially available protein-stabilised particles and particles coated with a water-soluble, non-toxic polymer, specifically synthesised for the purpose, were used in the study. First, the polymers were produced utilising a controlled radical polymerisation method. Synthetic polymer-grafted silver particles were then produced by attaching the water-soluble polymer to the surface of the silver with a sulfur bond.

Jukka Niskanen has utilised such polymerisation and coupling reactions in his doctoral dissertation, Polymeric and hybrid materials: polymers on particle surfaces and air-water interfaces, studying several hybrid nanomaterials, i.e., combinations of synthetic polymers and inorganic (gold, silver and montmorillonite) nanoparticles. Niskanen will defend h
'/>"/>

Contact: Jukka Niskanen
jukka.niskanen@helsinki.fi
University of Helsinki
Source:Eurekalert

Page: 1 2 3

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/18/2014)... suspected genetic conditions, a certain type of exome sequencing ... than traditional molecular diagnostic methods, according to a study ... released to coincide with the American Society of Human ... protein­coding region of the genome (the complete set of ... organism), has been rapidly applied in research settings and ...
(Date:10/17/2014)... Why do male ... reproduce? And why are there two sexes anyway? These and ... the research journal Molecular Human Reproduction published today ... University Bielefeld has compiled this special issue on sperm competition. ... copulate with several males in quick succession – chimpanzees are ...
(Date:10/17/2014)... is available in German . ... very few drugs. When treating overdoses, doctors are often limited ... difficult if there is a combination of drugs involved. So ... accidentally swallows his grandmother,s pills? ETH professor Jean-Christophe Leroux from ... find an answer to this question. "The task was to ...
Breaking Biology News(10 mins):Study examines type of exome sequencing and molecular diagnostic yield 2Study examines type of exome sequencing and molecular diagnostic yield 3Sperm wars 2Emergency aid for overdoses 2Emergency aid for overdoses 3
... Stanford, CA Greenhouse gases in the atmosphere are rising ... aggressive action to reduce emissions the climate system could ... century, warns a leading member of the Nobel Prize-winning ... warming could trigger a vicious cycle of feedback, in ...
... "Business managers of media organizations, you are screwing up ... are frankly the only ones competent to do this," ... assessing the current state of media coverage of global ... of chapter 19 in the report of the Intergovernmental ...
... a consequence of their inability to adapt to new ... species. Besides selection and the appearance of new species, ... driving forces behind evolution. According to the interpretation that ... "fitness" of the species overall, since, of two competing ...
Cached Biology News:Decisive action needed as warming predictions worsen, says expert 2Mass media often failing in its coverage of global warming, says climate researcher 2Mass media often failing in its coverage of global warming, says climate researcher 3The law of the weakest 2The law of the weakest 3
(Date:10/18/2014)... The Asian Electronic Medical Record (EMR) market report ... and forecast of revenue. The electronic medical record market in ... by 2018, at a CAGR of 9.4% from 2013 to ... Medical Record (EMR) market, to get an idea of the ... segmentation of the market in the same region, and is ...
(Date:10/18/2014)... (PRWEB) October 18, 2014 The ... Business Intelligence] - Text; Web; Speech; Machine; Video; ... Enterprise Roadmap, Market Forecasts & Analysis (2013 - ... Analytics Market into various sub segments with an ... report also identifies the factors driving this market, ...
(Date:10/17/2014)... Oct. 16—As in Alice,s journey through the looking-glass to ... in surprising and unexpected ways, including a new class ... As reported today in The Optical Society,s (OSA) new ... demonstrated, for the first time, a new type of ... instead reflects infrared light by using an unusual magnetic ...
(Date:10/17/2014)... (PRWEB) October 17, 2014 Bioquell, ... called upon by health facilities around the world ... are being treated. Among the many places the ... Texas Health Presbyterian Hospital Dallas and at the ... state-of-the-art vapor-producing robots have been utilized to decontaminate ...
Breaking Biology Technology:The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 2The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 3The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 4The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 5Cloud Analytics Market (by Cloud Business Intelligence & Predictive Analytics) Expected to Cross $16.52 Billion by 2018 - New Report by MarketsandMarkets 2Cloud Analytics Market (by Cloud Business Intelligence & Predictive Analytics) Expected to Cross $16.52 Billion by 2018 - New Report by MarketsandMarkets 3Cloud Analytics Market (by Cloud Business Intelligence & Predictive Analytics) Expected to Cross $16.52 Billion by 2018 - New Report by MarketsandMarkets 4Cloud Analytics Market (by Cloud Business Intelligence & Predictive Analytics) Expected to Cross $16.52 Billion by 2018 - New Report by MarketsandMarkets 5Magnetic mirrors enable new technologies by reflecting light in uncanny ways 2Magnetic mirrors enable new technologies by reflecting light in uncanny ways 3Magnetic mirrors enable new technologies by reflecting light in uncanny ways 4Bioquell’s Vapor Producing Robots Selected to Combat Ebola in Hospitals Around the World 2Bioquell’s Vapor Producing Robots Selected to Combat Ebola in Hospitals Around the World 3Bioquell’s Vapor Producing Robots Selected to Combat Ebola in Hospitals Around the World 4Bioquell’s Vapor Producing Robots Selected to Combat Ebola in Hospitals Around the World 5Bioquell’s Vapor Producing Robots Selected to Combat Ebola in Hospitals Around the World 6
... International,Corporation (Nasdaq: PRXL ) announced today that its ... Common Stock, which will be effected by,means of a ... will receive one additional share of,Common Stock for each ... of,February 22, 2008. The additional shares will be distributed ...
... Incorporated,(Nasdaq: GPRO ) announced today that Carl ... chief operating officer, effective March 1, 2008., ... 2007 as executive vice,president and chief operating officer. ... and development, manufacturing, and,sales and marketing., "Carl,s ...
... Feb. 11 BioSpace, the leading biotech,job board ... over 800,biotechnology and pharmaceutical job seekers to the ... CA., The BioSpace Career Fair attracted a ... diagnostics career,candidates from around southern California. The event ...
Cached Biology Technology:PAREXEL International Announces 2-For-1 Stock Split 2PAREXEL International Announces 2-For-1 Stock Split 3Carl Hull Named President and Chief Operating Officer of Gen-Probe 2Carl Hull Named President and Chief Operating Officer of Gen-Probe 3BioSpace Career Fair in San Diego Draws Record Number of Bioscience Candidates 2
... long and outstanding history in the ... ago we became aware that our ... modified to inject Xenopus oocytes. We ... microdispenser to eliminate any tip movement ...
...
... sequencing inserts cloned into M13/pUC-based plasmids, plasmids ... polymerase promoters, or lambda gt10 and gt11 ... of 0.1 µg/µl in water. The primers ... using SequiTherm™ EXCEL™ II DNA Polymerase with ...
... AutoGen AutoGenesys, BioRobotics BioPick, BioGrid, TAS and ... systems This CLS number is a new ... product number. If showing no availability yet, ... (D9314) or contact customer service for assistance. ...
Biology Products: