DSpace
 

Researchspace >
General science, engineering & technology >
General science, engineering & technology >
General science, engineering & technology >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5028

Title: Assessment of the effect of nanomaterials on sediment-dwelling invertebrate Chironomustentans larvae
Authors: Oberholster, PJ
Musee, N
Botha, A-M
Botha, PK
Focke, WW
Ashton, PJ
Keywords: Nanomaterials
Chironomus tentans
Bioassays
Ecotoxicology
DNA damage
Issue Date: Mar-2011
Publisher: Elsevier
Citation: Oberholster, PJ, Musee, N, Botha, A-M et al. 2011. Assessment of the effect of nanomaterials on sediment-dwelling invertebrate Chironomustentans larvae. Ecotoxicology and Environmental Safety, vol. 74(3), pp 416-423
Series/Report no.: Workflow;6309
Abstract: Studies were conducted to determine the effects of a panel of seven nanomaterials (NMs), namely: a-alumina, -alumina, precipitated silica; silica fume, calcined silica fume, colloidal antimony pentoxide (Sb2O5), and superfine amorphous ferric oxide (Fe2O3), on sediment dwelling invertebrates Chironomus tentans under controlled laboratory conditions. Percentage survival, enzyme activities, growth development, and DNA fragmentation parameters were studied as acute, biochemical, and physiological toxicities of NMs, respectively. Quantitation of catalase and peroxidase enzyme activity demonstrated that toxicant stress of the NMs increased enzyme activity in a concentration dependent fashion across all treatments. The percentage growth length of the test specimens exposed to different NMs was significantly reduced compared to the negative control while only five concentrations were not in the toxic range, namely; Fe2O3 (5 µg/kg); silica fume (5 µg/kg, 50 µg/kg); Sb2O5 (5 µg/kg) and calcined silica fume (5 µg/kg). Genotoxic stress assessed by use of DNA laddering showed complementary findings to the other ecotoxicological endpoints tested in this study—the percentage survival and growth length inhibition.
Description: Copyright: 2011 Elsevier. This is the post print version of the work. The definitive version is published in Ecotoxicology and Environmental Safety, vol. 74(3), pp 416-423
URI: http://www.sciencedirect.com/science/article/pii/S0147651310003957
http://hdl.handle.net/10204/5028
ISSN: 0147-6513
Appears in Collections:Pollution and waste
Environmental management
Nanotechnology
General science, engineering & technology

Files in This Item:

File Description SizeFormat
Ndeke_2011.pdf676.55 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback