Spanish National Research Council (CSIC) Have Provided New Information about Nanoparticles -->
By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Nanoparticles have been published. According to news reporting from Barcelona, Spain, by NewsRx journalists, research stated, "The extent to which different forms of nanoparticles of titanium dioxide (nano-TiO2) aggregated with microalgae, decreased food levels and hence impaired growth, reproduction and fitness of Daphnia magna individuals were studied. Treatments included three different types of nano-TiO2 differing in their coating or crystalline structure but of similar primary size (20 nm) plus a micron-sized bulk material, two exposure levels (1, 10mg/l) and two food ration levels of the microalgae Chlorella vulgaris that included a non limiting (1.5 ?gC/ml) and a limiting one (0.3 ?gC/ml)."
The news correspondents obtained a quote from the research from Spanish National Research Council (CSIC), "Effects were assessed using standardized chronic tests and assays that maximized food depletion in the water column under semi-static and re-suspension conditions. Results indicated that the high ion levels in culture medium lead to the aggregation of nanoparticles followed by particle destabilization. Nanoparticle aggregates interacted with the algae cells, forming clusters. Large TiO2-algae agglomerates settled readily dramatically depleting the concentration of available food for D. magna. At limiting food rations food depletion by nanoparticle aggregation had dramatic effects on reproduction and fitness of exposed D. magna at 1mg/l irrespectively of the particle form. At high food rations effects were only observed for one of the nano-TiO2, P-25, at high exposure levels (10 mg/l) under both semi-static and particle re-suspension conditions, which suggest that P-25 effects were mediated by clogging the gut and hence diminishing food acquisition."
According to the news reporters, the research concluded: "These results indicate that nano-TiO2 may affect the transfer of energy throughout the planktonic aquatic food webs increasing the settlement of edible particles from the water column."
For more information on this research see: Effects of nanoparticles of TiO2 on food depletion and life-history responses of Daphnia magna. Aquatic Toxicology, 2013;130-131():174-83. (Elsevier - www.elsevier.com; Aquatic Toxicology - www.elsevier.com/wps/product/cws_home/505509)
Our news journalists report that additional information may be obtained by contacting B. Campos, Dept. of Environmental Chemistry, IDAA-CSIC, Barcelona, Spain. Additional authors for this research include C. Rivetti, P. Rosenkranz, J.M. Navas and C. Barata (see also Nanoparticles).
Keywords for this news article include: Spain, Europe, Barcelona, Nanotechnology, Emerging Technologies.
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