Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Silver nanoparticles are toxic for aquatic organisms: A research team at the UPV/EHU-University of the Basque Country has analysed how zebrafish are affected in the long term by exposure to silver particles

The UPV/EHU's Cell Biology in Environmental Toxicology research group has analysed adult zebrafish to find out the effects that in the long term can be caused by these silver particles present in fresh water

CREDIT
Egoi Markaida. UPV/EHU
The UPV/EHU's Cell Biology in Environmental Toxicology research group has analysed adult zebrafish to find out the effects that in the long term can be caused by these silver particles present in fresh water CREDIT Egoi Markaida. UPV/EHU

Abstract:
What stands out among the main conclusions of the study is the fact that the distribution of the metal in the organs of the fish is influenced by the form (soluble or nanoparticles) that the silver takes in the water. At the same time, soluble silver was also found to cause short-term alterations (three days) and nanoparticles longer-term alterations (21 days); and that in both cases the animals had purified themselves of the silver accumulated in their bodies after spending six months in clean waters, although inflammation of the gills was found to remain after being exposed to the metal.

Silver nanoparticles are toxic for aquatic organisms: A research team at the UPV/EHU-University of the Basque Country has analysed how zebrafish are affected in the long term by exposure to silver particles

Bizkaia, Spain | Posted on September 19th, 2018

In the study, led by Amaia Orbea, three groups of 50-60 adult zebrafish each were used in three aquaria. Silver nitrate was added to the first tank to produce water-soluble silver; 20-nm silver nanoparticles (NP Ag) were added to the second; clean water was added to the third which was used as the control. The groups in the contaminated tanks remained exposed to both forms of the metal for 21 days before spending a further six months in clean water for the purpose of studying the consequences of long-term exposure to silver. A concentration of metal regarded as environmentally significant was used, in other words, a concentration that could be found in nature, for example at the outfall of wastewater from treatment plants. The accumulation of a substance is the first step for intoxication to take place.

three and 21 days of exposure to silver and after six months in clean water various chemical and biological analyses were carried out on the gills, liver and intestines of the fish. The research team selected the gills because that is the main entry route of the contaminants; the liver because it is the main organ in metabolism and detoxification; and the intestine because the silver nanoparticles can be absorbed through food.

It can be deduced from the analyses that the fish accumulate similar concentrations of metal after being exposed to soluble silver and silver nanoparticles. And that after 6 months in clean water the initial metal concentration levels were recovered. The conclusions differed when the organs of the fish were analysed. The distribution of silver in the liver and intestines depended on the type of metal used in the treatment, but both treatments led to inflammation of the gills of the fish, an effect that remained even after six months in clean water.

Furthermore, the analysis of the transcriptome of the liver revealed a strong impact of exposure to silver. The effect of soluble silver was more intense after three days of exposure when changes were detected in the expression levels of a total of 410 genic sequences. In the case of silver nanoparticles, the alteration was detected 21 days later and affected 799 sequences.

####

For more information, please click here

Contacts:
Matxalen Sotillo

34-688-673-770

Copyright © University of the Basque Country

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Bibliographical reference

Related News Press

News and information

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

Molecular Lego blocks: Chemical data mining boosts search for new organic semiconductors February 15th, 2019

The smallest skeletons in the marine world observed in 3D by synchrotron techniques February 15th, 2019

Possible Futures

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

Molecular Lego blocks: Chemical data mining boosts search for new organic semiconductors February 15th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Discoveries

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Molecular Lego blocks: Chemical data mining boosts search for new organic semiconductors February 15th, 2019

The smallest skeletons in the marine world observed in 3D by synchrotron techniques February 15th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Announcements

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Spintronics by 'straintronics': Switching superferromagnetism with electric-field induced strain February 15th, 2019

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Tracking pollen with quantum dots: A pollination biologist from Stellenbosch University in South Africa is using quantum dots to track the fate of individual pollen grains. This is breaking new ground in a field of research that has been hampered by the lack of a universal method February 17th, 2019

Super-light, super-insulating ceramic aerogel keeps the hottest temperatures at bay February 17th, 2019

NRL, AFRL develop direct-write quantum calligraphy in monolayer semiconductors February 15th, 2019

Researchers create ultra-lightweight ceramic material that withstands extreme temperatures: UCLA-led team develops highly durable aerogel that could ultimately be an upgrade for insulation on spacecraft February 15th, 2019

Environment

Rice U. lab adds porous envelope to aluminum plasmonics: Scientists marry gas-trapping framework to light-powered nanocatalysts February 10th, 2019

Platinum forms nano-bubbles: Technologically important noble metal oxidises more readily than expected January 28th, 2019

Using bacteria to create a water filter that kills bacteria: New technology can clean water twice as fast as commercially available ultrafiltration membranes January 18th, 2019

Plastic waste disintegrates into nanoparticles, study finds December 28th, 2018

Water

Laser-induced graphene gets tough, with help: Rice University lab combines conductive foam with other materials for capable new composites February 12th, 2019

A powerful catalyst for electrolysis of water that could help harness renewable energy January 25th, 2019

Using bacteria to create a water filter that kills bacteria: New technology can clean water twice as fast as commercially available ultrafiltration membranes January 18th, 2019

Study unlocks full potential of 'supermaterial' graphene: Researchers remove silicon contamination from graphene to double its performance November 30th, 2018

Safety-Nanoparticles/Risk management

Plastic waste disintegrates into nanoparticles, study finds December 28th, 2018

Spectradyne Partners with Particle Technology Labs for Measurement Services December 6th, 2018

Study provides insight into how nanoparticles interact with biological systems: Findings can help scientists engineer nanoparticles that are ‘benign by design’ October 18th, 2018

TUBALL single wall carbon nanotubes: No ecotoxicity found, unlike other carbon nanotubes October 12th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project