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Nanotechnology & Health
a collection of articles about nanomaterials and health
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Beyond Pesticides Daily News Blog » Nanoparticles Found To Be Toxic to Earthworms

Beyond Pesticides Daily News Blog » Nanoparticles Found To Be Toxic to Earthworms | Nanotechnology & Health | Scoop.it

"Earthworms are excellent indicators of soil health, and provide vitally important ecosystem services by aerating the soil, cycling nutrients, and increasing microbial activity. The Alterra study, led by Doctoral candidate Merel van der Ploeg, compared the health and growth of earthworms in soil containing carbon and silver nanoparticles at varying amounts with worms in regular soil. Mr. Van der Ploeg found the soil containing nanoparticles reduced reproduction, slowed growth, and increased the mortality rate of exposed earthworms. Young worms are particularly sensitive to the effects of the nanomaterial. Mr. Van der Ploeg notes, 'I also found damage to the skin tissue and intestinal wall, often accompanied by damage to the underlying muscle, but even though tissue damage is usually associated with inflammation, I did not observe this in the earthworms. There seemed to be a suppression of the immune system.'"

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ScienceDirect.com - Aquatic Toxicology - Toxicity of titanium dioxide nanoparticles to rainbow trout (Oncorhynchus mykiss): Gill injury, oxidative stress, and other physiological effects

ScienceDirect.com - Aquatic Toxicology - Toxicity of titanium dioxide nanoparticles to rainbow trout (Oncorhynchus mykiss): Gill injury, oxidative stress, and other physiological effects | Nanotechnology & Health | Scoop.it

"some exposure concentration-dependent changes in tissue Cu and Zn levels were observed, especially in the brain. Exposure to TiO2 NPs caused statistically significant decreases in Na+K+-ATPase activity (ANOVA, P < 0.05) in the gills and intestine, and a trend of decreasing enzyme activity in the brain (the latter was not statistically significant). Thiobarbituric acid reactive substances (TBARS) showed exposure concentration-dependent and statistically significant (ANOVA or Kruskal–Wallis test, P < 0.05) increases (two-fold or more) in the gill, intestine and brain, but not the liver during exposure to TiO2 NPs compared to controls. TiO2 NP exposure caused statistically significant (ANOVA, P < 0.05) increases in the total glutathione levels in the gills, but depletion of hepatic glutathione compared to controls... Liver cells exposed to TiO2 NPs showed minor fatty change and lipidosis, and some hepatocytes showed condensed nuclear bodies (apoptotic bodies)."

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The tiniest particles that may be a threat as bad as asbestos

The tiniest particles that may be a threat as bad as asbestos | Nanotechnology & Health | Scoop.it

Europe is failing to control a burgeoning industry in microscopic materials, prompting claims that it has failed to heed the lessons from millions of asbestos deaths, according to a hard-hitting new report... A major study published by the European Environment Agency (EEA) last week says European governments – including the UK's – are "paralysed by analysis" and failing to act: "Twenty years have elapsed since first indications of nanomaterial harm were published", it said, "and in the intervening time an increasing body of literature has been developed on how nanomaterials interact with cells, mammals and aquatic organisms. Yet many governments still call for more information as a substitute for action."

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Chemical Watch | News| Nanoparticles may affect water species ability to detect prey

Scientists have highlighted that citrate-coated silver nanoparticles may have a significant effect on ecological populations by influencing the ability of organisms to detect and avoid predators in the environment.
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