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https://www.readbyqxmd.com/read/28812956/toxicity-identification-and-evaluation-for-the-effluent-from-a-nonmetallic-mineral-mining-facility-in-korea-using-d-magna
#1
Sungjong Lee, Hongjoo Ha, JinKyung Hong, Guyoung Kang, Chunsang Hong
Industrial wastewater has attracted increasing attention in recent years because of its impact on ecosystems and human health. Whole-effluent tests are generally used to monitor toxicities of unknown chemicals and conventional pollutants from industrial effluent discharges. This study described identification evaluation (TIE) procedures to determine the acute toxicity of a nonmetallic mineral mining facility effluent that was toxic to Daphnia magna. In the characterization step (TIE phase I), toxic effects of heavy metals, organic compounds, oxidants, volatile organic compounds, suspended solids, and ammonia were screened...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28811387/selection-constrains-high-rates-of-tandem-repetitive-dna-mutation-in-daphnia-pulex
#2
Jullien M Flynn, Ian Caldas, Melania E Cristescu, Andrew G Clark
A long-standing evolutionary puzzle is that all eukaryotic genomes contain large amounts of tandemly-repeated DNA whose sequence motifs and abundance vary greatly among even closely related species. To elucidate the evolutionary forces governing tandem repeat dynamics, quantification of the rates and patterns of mutations in repeat copy number and tests of its selective neutrality are necessary. Here we used whole-genome sequences of 28 mutation accumulation (MA) lines of Daphnia pulex in addition to six isolates from a non-MA population originating from the same progenitor to both estimate mutation rates of abundances of repeat sequences and evaluate the selective regime acting upon them...
August 15, 2017: Genetics
https://www.readbyqxmd.com/read/28810200/influences-of-tio2-nanoparticles-on-dietary-metal-uptake-in-daphnia-magna
#3
Cheng Tan, Wen-Xiong Wang
Increasing applications of titanium dioxide nanoparticles (nano-TiO2) have intensified the risk of environmental contamination. Since nano-TiO2 can absorb metals and be consumed as 'food' by zooplankton but also can interact with phytoplankton, they could significantly disturb the existing metal assimilation patterns. In the present study, we quantified the dietary assimilation of Cd and Zn from nano-TiO2 and algae (Chlamydomonas reinhardtii) at comparable particle concentrations as well as in complex food environment (variable food quality and quantity) in a freshwater zooplankton Daphnia magna using the radiotracer technique...
August 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28810137/time-gated-luminescence-imaging-of-singlet-oxygen-photoinduced-by-fluoroquinolones-and-functionalized-graphenes-in-daphnia-magna
#4
Tianlie Luo, Jingwen Chen, Bo Song, Hua Ma, Zhiqiang Fu, Willie J G M Peijnenburg
Singlet oxygen ((1)O2) can be photogenerated by photoactive xenobiotics and is capable of causing adverse effects due to its electrophilicity and its high reactivity with biological molecules. Detection of the production and distribution of (1)O2 in living organisms is therefore of great importance. In this study, a luminescent probe ATTA-Eu(3+) combined with time-gated luminescence imaging was adopted to detect the distribution and temporal variation of (1)O2 photoinduced by fluoroquinolone antibiotics and carboxylated/aminated graphenes in Daphnia magna...
July 29, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28800684/sediment-zn-release-during-post-drought-re-flooding-assessing-environmental-risk-to-hyalella-azteca-and-daphnia-magna
#5
Sara M Nedrich, G Allen Burton
Hydrologic variability exacerbated by climate change affects biogeochemical cycling in sediments through changes in pH, redox, and microbial activity. These alterations affect the lability and speciation of metals, such that toxicity may be observed in otherwise non-toxic sediments. In this study, we investigate the effects of drought and reflooding on metal bioavailability in sediments with low to moderate concentrations of Zn (18-270 mg kg(-1)). Sediments were collected from coastal wetlands in Michigan, dried (36-days) and re-inundated in lab microcosms...
August 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28797900/elimination-and-ecotoxicity-evaluation-of-phthalic-acid-esters-from-textile-dyeing-wastewater
#6
Jieying Liang, Xun-An Ning, Minyi Kong, Daohua Liu, Guangwen Wang, Haili Cai, Jian Sun, Yaping Zhang, Xingwen Lu, Yong Yuan
Phthalic acid esters (PAEs), presented in fabrics, surfactants and detergents, were discharged into the ecosystem during textile-dyeing wastewater treatment and might have adverse effects on water ecosystems. In this study, comprehensive investigations of the content and component distributions of 12 PAEs across different units of four textile-dyeing wastewater plants were carried out in Guangdong Province, China. Ecotoxicity assessments were also conducted based on risk quotients (RQs). On average, 93.54% TOC and 80...
August 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28797523/the-acute-toxic-effects-of-1-alkyl-3-methylimidazolium-nitrate-ionic-liquids-on-chlorella-vulgaris-and-daphnia-magna
#7
Cheng Zhang, Shuai Zhang, Lusheng Zhu, Jinhua Wang, Jun Wang, Tongtong Zhou
Given their increasingly widespread application, the toxic effects of ionic liquids (ILs) have become the subject of significant attention in recent years. Therefore, the present study assessed the acute toxic effects of 1-alkyl-3-methylimidazolium nitrate ([Cnmim]NO3 (n = 2, 4, 6, 8, 10, 12)) on Chlorella vulgaris and Daphnia magna. The sensitivity of the tested organism Daphnia magna and the investigated IL concentrations in water using high-performance liquid chromatography (HPLC) were also evaluated to demonstrate the reliability of the present study...
August 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28782786/correction-effect-of-low-purity-fenton-reagents-on-toxicity-of-textile-dyeing-effluent-to-daphnia-magna
#8
Joorim Na, Jisu Yoo, Gwiwoong Nam, Jinho Jung
Correction for 'Effect of low-purity Fenton reagents on toxicity of textile dyeing effluent to Daphnia magna' by Joorim Na et al., Environ. Sci.: Processes Impacts, 2017, DOI: 10.1039/c7em00078b.
August 7, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28780892/ecotoxicological-modelling-of-cosmetics-for-aquatic-organisms-a-qstr-approach
#9
K Khan, K Roy
In this study, externally validated quantitative structure-toxicity relationship (QSTR) models were developed for toxicity of cosmetic ingredients on three different ecotoxicologically relevant organisms, namely Pseudokirchneriella subcapitata, Daphnia magna and Pimephales promelas following the OECD guidelines. The final models were developed by partial least squares (PLS) regression technique, which is more robust than multiple linear regression. The obtained model for P. subcapitata shows that molecular size and complexity have significant impacts on the toxicity of cosmetics...
August 7, 2017: SAR and QSAR in Environmental Research
https://www.readbyqxmd.com/read/28774626/formation-and-control-of-disinfection-byproducts-and-toxicity-during-reclaimed-water-chlorination-a-review
#10
REVIEW
Ye Du, Xiao-Tong Lv, Qian-Yuan Wu, Da-Yin Zhang, Yu-Ting Zhou, Lu Peng, Hong-Ying Hu
Chlorination is essential to the safety of reclaimed water; however, this process leads to concern regarding the formation of disinfection byproducts (DBPs) and toxicity. This study reviewed the formation and control strategies for DBPs and toxicity in reclaimed water during chlorination. Both regulated and emerging DBPs have been frequently detected in reclaimed water during chlorination at a higher level than those in drinking water, indicating they pose a greater risk to humans. Luminescent bacteria and Daphnia magna acute toxicity, anti-estrogenic activity and cytotoxicity generally increased after chlorination because of the formation of DBPs...
August 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28772339/native-species-dispersal-reduces-community-invasibility-by-increasing-species-richness-and-biotic-resistance
#11
Jennifer G Howeth
1. Recent studies indicate that diversity-invasibility relationships can depend upon spatial scale, but the contributing role of native species dispersal among local communities in mediating these relationships remains unaddressed. Metacommunity ecology highlights the effects of species dispersal rates on local diversity, thereby suggesting native species dispersal may influence local biotic resistance to invasion by non-native species. However, effects of native species dispersal rates on local native diversity and invasibility could depend upon any intraspecific differences of the invader that may alter establishment success...
August 3, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28770675/photoperiodism-of-male-offspring-production-in-the-water-flea-daphnia-pulex
#12
Kenji Toyota, Tomomi Sato, Norihisa Tatarazako, Taisen Iguchi
Photoperiodism is a biological seasonal timing system utilized to regulate development and reproduction in organisms. The freshwater micro-crustacean Daphnia pulex displays environmental sex determination, the precise physiological mechanisms of which are largely unknown due to the lack of an experimental system to induce female or male offspring production by alterations of the rearing environment. We recently found that D. pulex, WTN6 strain, produces female or male offspring in response to long-day or short-day conditions, respectively...
August 2017: Zoological Science
https://www.readbyqxmd.com/read/28764138/coating-carbon-nanotubes-with-humic-acid-using-an-eco-friendly-mechanochemical-method-application-for-cu-ii-ions-removal-from-water-and-aquatic-ecotoxicity
#13
Francine Côa, Mathias Strauss, Zaira Clemente, Laís L Rodrigues Neto, Josias R Lopes, Rafael S Alencar, Antônio G Souza Filho, Oswaldo L Alves, Vera Lúcia S S Castro, Edison Barbieri, Diego Stéfani T Martinez
In this work, industrial grade multi-walled carbon nanotubes (MWCNT) were coated with humic acid (HA) for the first time by means of a milling process, which can be considered an eco-friendly mechanochemical method to prepare materials and composites. The HA-MWCNT hybrid material was characterized by atomic force microscopy (AFM), scanning electron microscopies (SEM and STEM), X-ray photoelectron spectroscopy (XPS), termogravimetric analysis (TGA), and Raman spectroscopy. STEM and AFM images demonstrated that the MWCNTs were efficiently coated by the humic acid, thus leading to an increase of 20% in the oxygen content at the nanotube surface as observed by the XPS data...
July 28, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28762176/a-salty-landscape-of-fear-responses-of-fish-and-zooplankton-to-freshwater-salinization-and-predatory-stress
#14
William D Hintz, Rick A Relyea
Predator-prey relationships are altered by anthropogenic contaminants. Road salt is a widespread contaminant among freshwater ecosystems, yet a relatively understudied subject in community ecology. Unknown is whether road salt salinization interacts with predatory stress to influence the growth, behavior, or reproduction of freshwater organisms. Using rainbow trout (Oncorhynchus mykiss) and zooplankton (Daphnia pulex), we exposed them to variable levels of road salt (NaCl) crossed with the presence or absence of alarm cues or kairomones...
July 31, 2017: Oecologia
https://www.readbyqxmd.com/read/28761110/characterisation-and-pharmacological-analysis-of-a-crustacean-g-protein-coupled-receptor-the-red-pigment-concentrating-hormone-receptor-of-daphnia-pulex
#15
Heather G Marco, Heleen Verlinden, Jozef Vanden Broeck, Gerd Gäde
This is the first pharmacological characterisation of a neuropeptide G protein-coupled receptor (GPCR) in a crustacean. We cloned the ORF of the red pigment-concentrating hormone from a German strain of Daphnia pulex (Dappu-RPCH), as well as that of the cognate receptor (Dappu-RPCHR). Dappu-RPCHR has the hallmarks of the rhodopsin superfamily of GPCRs, and is more similar to insect adipokinetic hormone (AKH) receptor sequences than to receptor sequences for AKH/corazonin-like peptide or corazonin. We provide experimental evidence that Dappu-RPCH specifically activates the receptor (EC50 value of 65 pM) in a mammalian cell-based bioluminescence assay...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28746735/early-transcriptional-response-pathways-in-daphnia-magna-are-coordinated-in-networks-of-crustacean-specific-genes
#16
Luisa Orsini, James B Brown, Omid Shams Solari, Dong Li, Shan He, Ram Podicheti, Marcus H Stoiber, Katina I Spanier, Donald Gilbert, Mieke Jansen, Douglas Rusch, Michael E Pfrender, John K Colbourne, Mikko J Frilander, Jouni Kvist, Ellen Decaestecker, Karel A C De Schamphelaere, Luc De Meester
Natural habitats are exposed to an increasing number of environmental stressors that cause important ecological consequences. However, the multifarious nature of environmental change, the strength and the relative timing of each stressor largely limit our understanding of biological responses to environmental change. In particular early response to unpredictable environmental change, critical to survival and fitness in later life stages, is largely uncharacterized. Here, we characterize the early transcriptional response of the keystone species Daphnia magna to twelve environmental perturbations, including biotic and abiotic stressors...
July 26, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28745761/study-of-the-simulated-sunlight-photolysis-mechanism-of-ketoprofen-the-role-of-superoxide-anion-radicals-transformation-byproducts-and-ecotoxicity-assessment
#17
Yingfei Wang, Wen Deng, Fengliang Wang, Yuehan Su, Yiping Feng, Ping Chen, Jingshuai Ma, Haiying Su, Kun Yao, Yang Liu, Wenying Lv, Guoguang Liu
The aim of this study was to investigate the photolysis mechanism of ketoprofen (KET) under simulated sunlight. The results demonstrated that the photolysis of KET aligned well with pseudo first-order kinetics. Radical scavenging experiments and dissolved oxygen experiments revealed that the superoxide anion radical (O2˙(-)) played a primary role in the photolytic process in pure water. Bicarbonate slightly increased the photodegradation of KET through generating carbonate radicals, while DOM inhibited the photolysis via both attenuating light and competing radicals...
July 26, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28740757/using-electroretinograms-and-multi-model-inference-to-identify-spectral-classes-of-photoreceptors-and-relative-opsin-expression-levels
#18
Nicolas Lessios
Understanding how individual photoreceptor cells factor in the spectral sensitivity of a visual system is essential to explain how they contribute to the visual ecology of the animal in question. Existing methods that model the absorption of visual pigments use templates which correspond closely to data from thin cross-sections of photoreceptor cells. However, few modeling approaches use a single framework to incorporate physical parameters of real photoreceptors, which can be fused, and can form vertical tiers...
2017: PeerJ
https://www.readbyqxmd.com/read/28738199/acute-ecotoxicity-of-coated-colloidal-goethite-nanoparticles-on-daphnia-magna-evaluating-the-influence-of-exposure-approaches
#19
V González-Andrés, M Diez-Ortiz, C Delpivo, G Janer, A Fritzsche, S Vázquez-Campos
Synthesized iron oxide nanoparticles have been proposed as an alternative to non-dispersed iron oxides for in situ environmental remediation. Their colloidal properties enable their injection into porous media, i.e. soils and aquifers, and offer a higher efficiency in removing contaminants. However, this dispersed state is also the cause of concerns over their environmental fate and toxicity, e.g., by increasing the exposure time to aquatic organisms in groundwater remediation activities. Therefore, the objective of in situ groundwater remediation is to establish local reactive barriers in the subsurface by injection by means of reactive colloids with a controllable mobility under in situ conditions and present as colloids as shortly as possible...
July 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28737080/sbr-treatment-of-tank-truck-cleaning-wastewater-sludge-characteristics-chemical-and-ecotoxicological-effluent-quality
#20
Michel Caluwé, Thomas Dobbeleers, Dominique Daens, Luc Geuens, Ronny Blust, Jan Dries
A lab scale activated sludge sequencing batch reactor (SBR) was used to treat tank truck cleaning (TTC) wastewater with different operational strategies (identified as different stages). The first stage was an adaptation period for the seed sludge that originated from a continuous fed industrial plant treating TTC wastewater. The first stage was followed by a dynamic reactor operation based on the oxygen uptake rate (OUR). Thirdly, dynamic SBR control based on OUR treated a daily changing influent. Lastly, the reactor was operated with a gradually shortened fixed cycle...
July 24, 2017: Environmental Technology
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