Insights into the uptake, distribution, and efflux of arsenite associated with nano-TiO2 in determining its toxicity on Daphnia magna

2020 ◽  
Vol 7 (4) ◽  
pp. 1194-1204
Author(s):  
Zhuanxi Luo ◽  
Zhenhong Wang ◽  
Baoshan Xing
Keyword(s):  
Daphnia Magna ◽  
Trojan Horse ◽  
Nano Tio2

This study provides new insights into the “Trojan horse” effects of nano-TiO2 on arsenite (As(iii)) bioaccumulation in Daphnia magna.

Two-generational effects and recovery of arsenic and arsenate on Daphnia magna in the presence of nano-TiO2

2019 ◽  
Vol 172 ◽  
pp. 136-143 ◽  
Author(s):  
Wenhong Fan ◽  
Dingyuan Liang ◽  
Xiangrui Wang ◽  
JinQian Ren ◽  
Shengtao Xiao ◽  
...  
Keyword(s):  
Daphnia Magna ◽  
Nano Tio2 ◽  
Generational Effects

scholarly journals Metal sorption onto nanoscale plastic debris and trojan horse effects in Daphnia magna: Role of dissolved organic matter

2020 ◽  
Vol 186 ◽  
pp. 116410 ◽  
Author(s):  
Fazel Abdolahpur Monikh ◽  
Martina G. Vijver ◽  
Zhiling Guo ◽  
Peng Zhang ◽  
Gopala Krishna Darbha ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Daphnia Magna ◽  
Trojan Horse ◽  
Metal Sorption ◽  
Plastic Debris

scholarly journals Nano-TiO2 Phototoxicity in Fresh and Seawater: Daphnia magna and Artemia sp. as Proxies

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 55
Author(s):  
Ana C. Soler de la Vega ◽  
Alberto Cruz-Alcalde ◽  
Carmen Sans Mazón ◽  
Carlos Barata Martí ◽  
M. Silvia Diaz-Cruz
Keyword(s):  
Daphnia Magna ◽  
Uv Radiation ◽  
Engineered Nanoparticles ◽  
Indicator Organisms ◽  
Nano Tio2 ◽  
Micron Size ◽  
Reactive Halogen Species ◽  
Negative Impacts ◽  
Different Characteristics ◽  
Halogen Species

Nowadays, the industry is quite commonly using nanoparticles of titanium dioxide (nTiO2) especially in sunscreens, due to its higher reflective index in comparison to micron size TiO2. Its high demand causes its widespread environmental occurrence, thus damaging the environment. The aquatic ecosystems are the most vulnerable to contamination by nTiO2. Like other engineered nanoparticles, nTiO2 has demonstrated generation of reactive oxygen species (ROS) and reactive halogen species (RHS) in the aquatic environment under UV radiation. This study investigated the toxicity of nTiO2 towards two aquatic indicator organisms, one from freshwater (Daphnia magna) and the other from seawater (Artemia sp.), under simulated solar radiation (SSR). Daphnia magna and Artemia sp. were co-exposed in 16 h SSR and 8 h darkness cycles to different concentrations of nTiO2. The estimated EC50 at 48 h for D. magna was 3.16 mg nTiO2/L, whereas for A. sp. no toxic effects were observed. When we exposed these two organisms simultaneously to 48 h of prolonged SSR using higher nTiO2 concentrations, EC50 values of 7.60 mg/L and 5.59 mg/L nTiO2 for D. magna and A. sp., respectively, were obtained. A complementary bioassay was carried out with A. sp., by exposing this organism to a mixture of nTiO2 and organic UV filters (benzophenone 3 (oxybenzone, BP3), octocrylene (OC), and ethyl 4-aminobenzoate (EtPABA)), and then exposed to SSR. The results suggested that nTiO2 could potentially have negative impacts on these organisms, also this work outlines the different characteristics and interactions that may contribute to the mechanisms of environmental (in salted and freshwater) phototoxicity of nTiO2 and UV radiation, besides their interaction with organic compounds.

Nano-TiO2 enhances the toxicity of copper in natural water to Daphnia magna

2011 ◽  
Vol 159 (3) ◽  
pp. 729-734 ◽  
Author(s):  
Wenhong Fan ◽  
Minming Cui ◽  
Hong Liu ◽  
Chuan Wang ◽  
Zhiwei Shi ◽  
...  
Keyword(s):  
Daphnia Magna ◽  
Natural Water ◽  
Nano Tio2

Membrane-bound vesicles associated with the microvilli in the midgut of the freshwater microcrustacean, Daphnia magna

1983 ◽  
Vol 41 ◽  
pp. 480-481
Author(s):  
Patricia L. Jansma
Keyword(s):  
Daphnia Magna ◽  
Intestinal Epithelial Cells ◽  
Uranyl Acetate ◽  
Intestinal Epithelial ◽  
Chlamydomonas Reinhardii ◽  
Thin Sections ◽  
Saturated Water ◽  
Cacodylate Buffer ◽  
Membrane Bound ◽  
Ethanol Series

The presence of the membrane bound vesicles or blebs on the intestinal epithelial cells has been demonstrated in a variety of vertebrates such as chicks, piglets, hamsters, and humans. The only invertebrates shown to have these microvillar blebs are two species of f1ies. While investigating the digestive processes of the freshwater microcrustacean, Daphnia magna, the presence of these microvillar blebs was noticed.Daphnia magna fed in a suspension of axenically grown green alga, Chlamydomonas reinhardii for one hour were narcotized with CO2 saturated water. The intestinal tracts were excised in 2% glutaraldehyde in 0.2 M cacodyl ate buffer and then placed in fresh 2% glutaraldehyde for one hour. After rinsing in 0.1 M cacodylate buffer, the sample was postfixed in 2% OsO4, dehydrated with a graded ethanol series, infiltrated and embedded with Epon-Araldite. Thin sections were stained with uranyl acetate and Reynolds lead citrate before viewing with the Philips EM 200.

Computer Reconstruction of the Cellular Architecture of the Daphnia Magna Optic Ganglion

1975 ◽  
Vol 33 ◽  
pp. 284-285
Author(s):  
E. R. Macagno ◽  
C. Levinthal
Keyword(s):  
Daphnia Magna ◽  
Genetic Background ◽  
Compound Eye ◽  
Synaptic Connectivity ◽  
Serial Sections ◽  
Cross Sectional ◽  
Small Crustacean ◽  
Optic Ganglion ◽  
Structural Invariance ◽  
High Degree

The optic ganglion of Daphnia Magna, a small crustacean that reproduces parthenogenetically contains about three hundred neurons: 110 neurons in the Lamina or anterior region and about 190 neurons in the Medulla or posterior region. The ganglion lies in the midplane of the organism and shows a high degree of left-right symmetry in its structures. The Lamina neurons form the first projection of the visual output from 176 retinula cells in the compound eye. In order to answer questions about structural invariance under constant genetic background, we have begun to reconstruct in detail the morphology and synaptic connectivity of various neurons in this ganglion from electron micrographs of serial sections (1). The ganglion is sectioned in a dorso-ventra1 direction so as to minimize the cross-sectional area photographed in each section. This area is about 60 μm x 120 μm, and hence most of the ganglion fit in a single 70 mm micrograph at the lowest magnification (685x) available on our Zeiss EM9-S.

Beware of ‘Trojan Horse Marketing’

2008 ◽  
Vol 39 (12) ◽  
pp. 14
Author(s):  
CHARLESE. CRUTCHFIELD
Keyword(s):  
Trojan Horse
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