Pesquisar este blog

Translate

quinta-feira, 13 de outubro de 2011

Nanoparticles Cause Brain Injury in Fish

ScienceDaily (Sep. 21, 2011) 

Scientists at the University of Plymouth have shown, for the first time in an animal, that nanoparticles have a detrimental effect on the brain and other parts of the central nervous system.


They subjected rainbow trout to titanium oxide nanoparticles which are widely used as a whitening agent in many products including paints, some personal care products, and with applications being considered for the food industry. 
They found that the particles caused vacuoles (holes) to form in parts of the brain and for nerve cells in the brain to die. Although some effects of nanoparticles have been shown previously in cell cultures and other in vitro systems this is the first time it has been confirmed in a live vertebrate.
The results will be presented at the "6th International meeting on the Environmental Effects on Nanoparticles and Nanomaterials" (21st -- 23rd September) at the Royal Society in London.
"It is not certain at this stage of the research whether these effects are caused by the nanoparticles entering the brain or whether it is a secondary effect of nanoparticle chemistry or reactivity," says Professor Richard Handy, lead scientist.
The results of Professor Handy's work and that of other researchers investigating the biological effects of nanoparticles may influence policy regulations on the environmental protection and human safety of nanomaterials.
"It is worrying that the effects on the fish brain caused by these nanoparticles have some parallels with other substances like mercury poisoning, and one concern is that the materials may bioaccumulate and present a progressive or persistent hazard to wildlife and to humans," says Professor Handy.

Story Source:

The above story is reprinted (with editorial adaptations by ScienceDaily staff) from materials provided by Society for Experimental Biology, via EurekAlert!, a service of AAAS.

Society for Experimental Biology. "Nanoparticles cause brain injury in fish."ScienceDaily, 21 Sep. 2011. Web. 13 Oct. 2011.





Fonte: ScienceDaily

___________________________________________________

REFLEXÃO: Vocês já pararam para analisar a quantidade de produtos que possuem nanopartículas (cremes dentais, protetores solares, cremes para o rosto e para o corpo, tintas de impressora, raquetes de tênis, meias, camisetas, adesivos, teclados de computadores....enfim....).


Essa interação nanopartículas e meio ambiente é nociva.

Agora pensem nos dejetos que essas empresas produzem, vão parar nos riachos que vão
parar nos peixes e algas, que vão parar no seu prato e que vão parar no seu cérebro e que vão te levar ao ataúde.

Trágico e realçador, porém tende e mostram-se com as pesquisas que é verdade. Não esqueça de uma matéria que saiu no
Estadão em 2009 que afirmava a morte de duas jovens trabalhadoras e cinco com danos permanentes nos pulmões por causa das nanopartículas (elas trabalhavam numa fábrica de tintas!).

PRECAUÇÃO é o que devemos possuir.