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Ecotoxicology and Environmental Safety

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https://www.readbyqxmd.com/read/28343007/bioconcentration-and-multi-biomarkers-of-organic-uv-filters-bm-dbm-and-od-paba-in-crucian-carp
#1
Binni Ma, Guanghua Lu, Jianchao Liu, Zhenhua Yan, Haohan Yang, Ting Pan
Organic UV filters (OUV-Fs) are increasingly used in sunscreens and personal care products. In the present work, the bioconcentration and multi-biomarker effects of butyl methoxydibenzoylmethane (BM-DBM) and ethylhexyl dimethyl p-aminobenzoate (OD-PABA) were investigated in crucian carp (Carassius auratus). The fish were exposed to various concentrations of BM-DBM (3.88, 35.61, 181.85 and 337.15μg/L), OD-PABA (4.66, 53.83, 264.22 and 459.32μg/L) and their mixture (2.31+2.79, 23.69+26.18, 97.37+134.81 and 193...
March 23, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28343006/trouble-on-takeoff-crude-oil-on-feathers-reduces-escape-performance-of-shorebirds
#2
Ivan Maggini, Lisa V Kennedy, Kyle H Elliott, Karen M Dean, Robert MacCurdy, Alexander Macmillan, Chris A Pritsos, Christopher G Guglielmo
The ability to takeoff quickly and accelerate away from predators is crucial to bird survival. Crude oil can disrupt the fine structure and function of feathers, and here we tested for the first time how small amounts of oil on the trailing edges of the wings and tail of Western sandpipers (Calidris mauri) affected takeoff flight performance. In oiled birds, the distance travelled during the first 0.4s after takeoff was reduced by 29%, and takeoff angle was decreased by 10° compared to unoiled birds. Three-axis accelerometry indicated that oiled sandpipers produced less mechanical power output per wingbeat during the initial phase of flight...
March 23, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28342328/reproductive-toxicity-of-%C3%AE-diketone-antibiotic-mixtures-to-zebrafish-danio-rerio
#3
Xuedong Wang, Yan Ma, Jinfeng Liu, Xiaohan Yin, Zhiheng Zhang, Caihong Wang, Yanyan Li, Huili Wang
So far, few data are available on the reproductive toxicological assessment of β-diketone antibiotics (DKAs), a class of ubiquitous pseudo-persistent pollutant, in zebrafish (Danio rerio). Herein, we reported the reproductive effects of DKAs by means of transcriptome analysis (F1-zebrafish), changes in a series of reproductive indices (F0-zebrafish) and histopathological observations. A total of 1170, 983 and 1399 genes were found to be differentially expressed when compared control vs. 6.25mg/L, control vs...
March 22, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28342327/influence-of-terrestrial-radionuclides-on-environmental-gamma-exposure-in-a-uranium-deposit-in-para%C3%A3-ba-brazil
#4
José Araújo Dos Santos Júnior, Romilton Dos Santos Amaral, Rômulo Simões Cezar Menezes, Juan Reinaldo Estevez Álvarez, Josineide Marques do Nascimento Santos, Zahily Herrero Fernández, Jairo Dias Bezerra, Alberto Antônio da Silva, Kennedy Francys Rodrigues Damascena, José de Almeida Maciel Neto
One of the main natural uranium deposits in Brazil is located in the municipality of Espinharas, in the State of Paraíba. This area may present high levels of natural radioactivity due to the presence of these radionuclides. Since this is a populated area, there is need for a radioecological dosimetry assessment to investigate the possible risks to the population. Based on this problem, the objective of this study was to estimate the environmental effective dose outdoors in inhabited areas influenced by the uranium deposit, using the specific activities of equivalent uranium, equivalent thorium and (40)K and conversion factors...
March 22, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28340370/validation-of-comet-assay-in-oregon-r-and-wild-type-strains-of-drosophila-melanogaster-exposed-to-a-natural-radioactive-environment-in-brazilian-semiarid-region
#5
Cícero Jorge Verçosa, Aroldo Vieira de Moraes Filho, Ícaro Fillipe de Araújo Castro, Robson Gomes Dos Santos, Kenya Silva Cunha, Daniela de Melo E Silva, Ana Cristina Lauer Garcia, Julio Alejandro Navoni, Viviane Souza do Amaral, Claudia Rohde
Natural radiation of geological origin is a common phenomenon in Brazil, a country where radioactive agents such as uranium may be often found. As an unstable atom, uranium undergoes radioactive decay with the generation of a series of decay by-products, including radon, which may be highly genotoxic and trigger several pathological processes, among which cancer. Because it is a gas, radon may move freely between cracks and gaps in the ground, seeping upwards into the buildings and in the environment. In this study, two Drosophila melanogaster Meigen (Diptera, Drosophilidae) strains called Oregon-R and Wild (collected in a non-radioactive environment) were exposed to atmospheric radiation in the Lajes Pintadas city, in the semiarid zone of northeastern Brazil...
March 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28340369/degradation-of-diclofenac-by-uv-activated-persulfate-process-kinetic-studies-degradation-pathways-and-toxicity-assessments
#6
Xian Lu, Yisheng Shao, Naiyun Gao, Juxiang Chen, Yansen Zhang, Huiming Xiang, Youluo Guo
Diclofenac (DCF) is the frequently detected non-steroidal pharmaceuticals in the aquatic environment. In this study, the degradation of DCF was evaluated by UV-254nm activated persulfate (UV/PS). The degradation of DCF followed the pseudo first-order kinetics pattern. The degradation rate constant (kobs) was accelerated by UV/PS compared to UV alone and PS alone. Increasing the initial PS dosage or solution pH significantly enhanced the degradation efficiency. Presence of various natural water constituents had different effects on DCF degradation, with an enhancement or inhibition in the presence of inorganic anions (HCO3(-) or Cl(-)) and a significant inhibition in the presence of NOM...
March 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28324819/impact-of-different-feedstocks-derived-biochar-amendment-with-cadmium-low-uptake-affinity-cultivar-of-pak-choi-brassica-rapa-ssb-chinensis-l-on-phytoavoidation-of-cd-to-reduce-potential-dietary-toxicity
#7
Kiran Yasmin Khan, Barkat Ali, Xiaoqiang Cui, Ying Feng, Xiaoe Yang, Peter Joseph Stoffella
Biochar has become eco-friendly amendment used for phytoavoidation with low cadmium (Cd) accumulating cultivars of crops to ensure food safety in Cd contaminated soils. In this study, biochar with different waste feedstock material were evaluated for their effectiveness on essential trace metals mobility, Cd bioavailability and its accumulation in two contrasting Cd accumulating cultivars of pak choi (Brassica rapa ssp. chinensis L.) grown in Cd contaminated Mollisol soil. A greenhouse experiment was conducted with plants grown in Cd contaminated soil that had been amended with biochar derived from barley straw, tomato green waste, chicken manure, duck manure and swine manure at application rate of 0%, 2...
March 18, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28324818/exogenous-malic-acid-alleviates-cadmium-toxicity-in-miscanthus-sacchariflorus-through-enhancing-photosynthetic-capacity-and-restraining-ros-accumulation
#8
Haipeng Guo, Houming Chen, Chuntao Hong, Dean Jiang, Bingsong Zheng
Malic acid (MA) plays an important role in the regulation of plant growth, stomatal aperture, nutrition elements homeostasis and toxic metals tolerance. However, little is known about the effects of exogenous MA on physiological and biochemical responses to toxic metals in plants. To measure the alleviation roles of exogenous MA against cadmium (Cd), we determined the effects of MA on plant growth, net photosynthetic rate (Pn), reactive oxygen species (ROS) accumulation and the activities of anti-oxidant enzymes in the leaves of Miscanthus sacchariflorus (M...
March 18, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28324817/developmental-toxicity-and-induction-of-vitellogenin-in-embryo-larval-stages-of-zebrafish-danio-rerio-exposed-to-methyl-paraben
#9
Vrinda Yatin Dambal, Karthikeyan Ponnien Selvan, Christy Lite, S Barathi, Winkins Santosh
MethylParaben (MP), a methyl ester of p-hydroxybenzoic acid, is used as an anti-microbial preservative in foods, drugs and cosmetics for decades. It enters the aquatic environment, and can have toxic effects on aquatic organisms. Little is known on the developmental toxicity of MP exposure to zebrafish during early life stages. In this study, the developmental effects of MP were evaluated in embryo-larval zebrafish (at concentrations ranging from 100μM, 200μM, 400µM, 800μM and 1000μM for 96h post fertilization (hpf)...
March 18, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319865/application-of-a-self-organizing-map-and-positive-matrix-factorization-to-investigate-the-spatial-distributions-and-sources-of-polycyclic-aromatic-hydrocarbons-in-soils-from-xiangfen-county-northern-china
#10
Shi-Yang Tao, Bu-Qing Zhong, Yan Lin, Jin Ma, Yongzhang Zhou, Hong Hou, Long Zhao, Zaijin Sun, Xiaopeng Qin, Huading Shi
The concentrations of 16 priority polycyclic aromatic hydrocarbons (PAHs) were measured in 128 surface soil samples from Xiangfen County, northern China. The total mass concentration of these PAHs ranged from 52 to 10,524ng/g, with a mean of 723ng/g. Four-ring PAHs contributed almost 50% of the total PAH burden. A self-organizing map and positive matrix factorization were applied to investigate the spatial distribution and source apportionment of PAHs. Three emission sources of PAHs were identified, namely, coking ovens (21...
March 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319864/enantioselective-degradation-of-alpha-cypermethrin-and-detection-of-its-metabolites-in-bullfrog-rana-catesbeiana
#11
Guojun Yao, Xu Jing, Chang Liu, Peng Wang, Xueke Liu, Yinzhu Hou, ZhiQiang Zhou, Donghui Liu
Bullfrog, as a kind of amphibians, can be easily exposed to varied pollutants in the environment for the reason of its habitats and highly permeable skin. We investigated the degradation kinetics and residues of α-cypermethrin in bullfrog by two different methods of administration for the environmental monitoring the behavior of one of the most used pesticides in the amphibians. The oral administration and water exposure of α-cypermethrin on bullfrog was studied in this work. α-Cypermethrin and its main metabolites of cis-3-(2',2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylic acid (cis-DCCA) and 3-phenoxybenzoic acid (3-PBA), which have been determined that having correlation with a number of epidemic diseases, were detected simultaneously...
March 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319859/use-of-clay-to-remediate-cadmium-contaminated-soil-under-different-water-management-regimes
#12
Jianrui Li, Yingming Xu
We examined in situ remediation of sepiolite on cadmium-polluted soils with diverse water regimes, and several variables including brown rice Cd, exchangeable Cd, pH, and available Fe/P. pH, available Fe/P in soils increased gradually during continuous flooding, which contributed to Cd absorption on colloids. In control group (untreated soils), compared to conventional irrigation, brown rice Cd in continuous flooding reduced by 37.9%, and that in wetting irrigation increased by 31.0% (p<0.05). In contrast to corresponding controls, brown rice Cd in sepiolite treated soils reduced by 44...
March 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319863/binding-affinity-and-adhesion-force-of-organophosphate-hydrolase-enzyme-with-soil-particles-related-to-the-isoelectric-point-of-the-enzyme
#13
Shah Md Asraful Islam, Shabina Yeasmin, Md Saiful Islam, Md Shariful Islam
The binding affinity of organophosphate hydrolase enzyme (OphB) with soil particles in relation to the isoelectric point (pI) was studied. Immobilization of OphB with soil particles was observed by confocal microscopy, Fourier transform infrared spectroscopy (FT-IR), and Atomic force microscopy (AFM). The calculated pI of OphB enzyme was increased from 8.69 to 8.89, 9.04 and 9.16 by the single, double and triple mutant of OphB enzyme, respectively through the replacement of negatively charged aspartate with positively charged histidine...
March 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319862/multi-phase-distribution-and-comprehensive-ecological-risk-assessment-of-heavy-metal-pollutants-in-a-river-affected-by-acid-mine-drainage
#14
Jianbo Liao, Xuan Ru, Binbin Xie, Wanhui Zhang, Haizhen Wu, Chaofei Wu, Chaohai Wei
To date, there is a lack of a comprehensive research on heavy metals detection and ecological risk assessment in river water, sediments, pore water (PW) and suspended solids (SS). Here, the concentrations of heavy metals, including Cu, Zn, Mn, Cd, Pb and As, and their distribution between the four phases was studied. Samples for analysis were taken from twelve sites of the Hengshi River, Guangdong Province, China, during the rainy and dry seasons. A new comprehensive ecological risk index (CERI) based on considering metal contents, pollution indices, toxicity coefficients and water categories is offered for prediction of potential risk on aquatic organisms...
March 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319861/different-salt-concentrations-induce-alterations-both-in-photosynthetic-parameters-and-salt-gland-activity-in-leaves-of-the-mangrove-avicennia-schaueriana
#15
Janaina Dos Santos Garcia, Ândrea Carla Dalmolin, Marcel Giovanni Costa França, Pedro Antônio Oliveira Mangabeira
Mangrove sites are constantly under tidal regimes, where there is variation of dissolved oxygen and saline content in water. This study evaluated the effects of varying salinity in Avicennia schaueriana, an abundant species in the sea-mangrove-river interface. Seedlings of A. schaueriana were harvested at the riverbank and placed in different saline and nutrient solutions in a greenhouse in order to simulate a saline flow. After 7 acclimatization days, plants were exposed to the following saline concentrations: 0, 50, 170 and 250mM NaCl, for a period of 30 days...
March 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319889/the-evolution-of-environmental-metalloproteomics-over-the-last-15-years-through-bibliometric-techniques
#16
Rachel Ann Hauser-Davis, Renato Matos Lopes, Fábio Batista Mota, Josino Costa Moreira
Metalloproteomic studies in environmental scenarios are of significant value in elucidating metal uptake, trafficking, accumulation and metabolism linked to biomolecules in biological systems. The advent of this field occurred in the early 2000s, and it has since become an interesting and growing area of interdisciplinary research, although the number of publications in Environmental Metalloprotemics is still very low compared to other metallomic areas. In this context, the evolution of Environmental Metalloprotemics in the last decades was evaluated herein through the use of bibliometric techniques, identifying variables that may aid researchers in this area to form collaborative networks with established scientists in this regard, such as main authors, published articles, institutions, countries and established collaborations involved in academic research on this subject...
March 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319860/effects-of-silver-nanoparticles-on-survival-biomass-change-and-avoidance-behaviour-of-the-endogeic-earthworm-allolobophora-chlorotica
#17
C Brami, A R Glover, K R Butt, C N Lowe
Increasing commercial application of silver nanoparticles (Ag NP) and subsequent presence in wastewater and sewage sludge has raised concerns regarding their effects in the aquatic and terrestrial environment. Several studies have employed standardised acute and chronic earthworm-based tests to establish the toxicological effects of Ag NP within soil. These studies have relied heavily on the use of epigiec earthworm species which may have limited ecological relevance in mineral soil. This study assessed the influence of Ag NP (uncoated 80nm powder) and AgNO3 on survival, change in biomass and avoidance behaviour in a soil dwelling (endogiec) species, Allolobophora chlorotica...
March 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28314142/responses-to-silver-nanoparticles-and-silver-nitrate-in-a-battery-of-biomarkers-measured-in-coelomocytes-and-in-target-tissues-of-eisenia-fetida-earthworms
#18
Curieses Silvana Patricia, García-Velasco Nerea, Urionabarrenetxea Erik, Sáenz María Elena, Bilbao Eider, Di Marzio Walter Darío, Soto Manu
The current use and development of applications with silver nanoparticles (Ag NPs) could lead to potential inputs of these NPs to soils. Consequently, it is crucial to understand the ecotoxicological risks posed by Ag NPs in the terrestrial compartment. In the present investigation, the effects produced by PVP-PEI coated Ag NPs were assessed in Eisenia fetida earthworms in comparison with the soluble form (AgNO3). Earthworms were exposed for 1, 3 and 14 days to a range of sublethal concentrations of Ag (0, 0...
March 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28314141/assay-validation-of-the-cardiac-isoform-of-troponin-i-in-double-crested-cormorant-phalacrocorax-auritus-plasma-for-diagnosis-of-cardiac-damage
#19
Melissa Daigneault, Kendal E Harr, Karen M Dean, Steven J Bursian
Cardiac abnormalities, initially found in Deepwater Horizon weathered MC252 crude oil exposed Double Crested Cormorants (DCCOs) upon gross necropsy, were further investigated using echocardiography. Clinical and statistically significant changes including decreased ventricular myocardial contractility and arrhythmia were elucidated by echocardiography and interpreted by boarded cardiologists as potentially life threatening. The objective of this investigation was to initiate development of an antemortem, sensitive blood screening test for cardiac damage due to oil exposure of avian species...
March 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28314140/an-investigation-of-the-immunotoxicity-of-oil-sands-processed-water-and-leachates-in-trout-leukocytes
#20
F Gagné, A Bruneau, P Turcotte, C Gagnon, E Lacaze
Increased oil sands (OS) mining activity has raised concerns about impacts on aquatic organisms. This study sought to examine the effects of single representative compounds from OS (benzo(a)pyrene, naphthalene), a mixture of naphthenic acids (NAs), OS-processed water (OSPW) and OS leachate (OSL) extracts on rainbow trout leukocytes. Primary cultures of trout leukocytes were exposed to increasing concentrations of benzo(a)pyrene, naphthalene, NAs, OSPW and OSL for 48h at 18°C. Immunocompetence was followed by measuring changes in lymphocyte and macrophage viability and phagocytosis...
March 14, 2017: Ecotoxicology and Environmental Safety
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