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https://www.readbyqxmd.com/read/28549301/ecotoxicological-effect-of-ketamine-evidence-of-acute-chronic-and-photolysis-toxicity-to-daphnia-magna
#1
Shih-Wei Li, Yu-Hsiang Wang, Angela Yu-Chen Lin
Ketamine has been increasingly used in medicine and has the potential for abuse or illicit use around the world. Ketamine cannot be removed by conventional wastewater treatment plants. Although ketamine and its metabolite norketamine have been detected to a significant degree in effluents and aquatic environments, their ecotoxicity effects in aquatic organisms remain undefined. In this study, we investigated the acute toxicity of ketamine and its metabolite, along with the chronic reproductive toxicity of ketamine (5-100μg/L) to Daphnia magna...
May 23, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28544153/simulated-climate-change-epidemic-size-and-host-evolution-across-host-parasite-populations
#2
Stuart K J R Auld, June Brand
Climate change is causing warmer and more variable temperatures as well as physical flux in natural populations, which will affect the ecology and evolution of infectious disease epidemics. Using replicate semi-natural populations of a coevolving freshwater invertebrate-parasite system (host: Daphnia magna, parasite: Pasteuria ramosa), we quantified the effects of ambient temperature and population mixing (physical flux within populations) on epidemic size and population health. Each population was seeded with an identical suite of host genotypes and dose of parasite transmission spores...
May 22, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28542405/exchange-of-polar-lipids-from-adults-to-neonates-in-daphnia-magna-perturbations-in-sphingomyelin-allocation-by-dietary-lipids-and-environmental-toxicants
#3
Namrata Sengupta, Delaney C Reardon, Patrick D Gerard, William S Baldwin
Because xenosensing nuclear receptors are also lipid sensors that regulate lipid allocation, we hypothesized that toxicant-induced modulation of HR96 activity would alter lipid profiles and the balance between adult survival and neonate production following exposure in Daphnia magna. Adult daphnids were exposed to unsaturated fatty acid- and toxicant- activators or inhibitors of HR96 and later starved to test whether chemical exposure altered allocation toward survival or reproduction. The HR96 activators, linoleic acid and atrazine, decreased reproduction as expected with concomitant changes in the expression of HR96 regulated genes such as magro...
2017: PloS One
https://www.readbyqxmd.com/read/28537026/triclocarban-uv-photolysis-wastewater-disinfection-and-ecotoxicity-assessment-using-molecular-biomarkers
#4
Suéllen Satyro, Enrico Mendes Saggioro, Fábio Veríssimo, Daniel Forsin Buss, Danielly de Paiva Magalhães, Anabela Oliveira
Triclocarban (TCC) is an antibacterial agent found in pharmaceuticals and personal care products (PPCP). It is potentially bioaccumulative and an endocrine disruptor, being classified as a contaminant of emerging concern (CEC). In normal uses, approximately 96% of the used TCC can be washed down the drain going into the sewer system and eventually enter in the aquatic environment. UV photolysis can be used to photodegrade TCC and ecotoxicity assays could indicate the photodegradation efficiency, since the enormous structural diversity of photoproducts and their low concentrations do not always allow to identify and quantify them...
May 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28505576/toxicity-of-environmentally-realistic-concentrations-of-chlorpyrifos-and-terbuthylazine-in-indoor-microcosms
#5
Ana Santos Pereira, Maria José Cerejeira, Michiel A Daam
Few studies have been conducted into the evaluation of environmentally realistic pesticide mixtures using model ecosystems. In the present study, the effects of single and combined environmentally realistic concentrations of the herbicide terbuthylazine and the insecticide chlorpyrifos were evaluated using laboratory microcosms. Direct toxic effects of chlorpyrifos were noted on copepod nauplii and cladocerans and the recovery of the latter was likely related with the decrease observed in rotifer abundances...
May 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28494353/removal-of-pesticides-and-ecotoxicological-changes-during-the-simultaneous-treatment-of-triazines-and-chlorpyrifos-in-biomixtures
#6
Verónica Lizano-Fallas, Mario Masís-Mora, David Espinoza-Villalobos, Michelle Lizano-Brenes, Carlos E Rodríguez-Rodríguez
Biopurification systems constitute a biological approach for the treatment of pesticide-containing wastewaters produced in agricultural activities, and contain an active core called biomixture. This work evaluated the performance of a biomixture to remove and detoxify a combination of three triazine herbicides (atrazine/terbuthylazine/terbutryn) and one insecticide (chlorpyrifos), and this efficiency was compared with dissipation in soil alone. The potential enhancement of the process was also assayed by bioaugmentation with the ligninolytic fungi Trametes versicolor...
April 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/28486188/cladoceran-offspring-tolerance-to-toxic-microcystis-is-promoted-by-maternal-warming
#7
Kai Lyu, Lu Zhang, Lei Gu, XueXia Zhu, Alan E Wilson, Zhou Yang
Elevated temperatures and nutrients can favor phytoplankton dominance by cyanobacteria, which can be toxic to zooplankton. There is growing awareness that maternal effects not only are common but can also significantly impact ecological interactions. Although climate change is broadly studied, relatively little is known regarding its influence on maternal effects in zooplankton. Given that lakes are sentinels for climate change and that elevated temperatures and nutrient pollution can favor phytoplankton dominance by toxic cyanobacteria, this study focused on elucidating the effects of maternal exposure to elevated temperatures on the tolerance of zooplankton offspring to toxic cyanobacteria in the diet...
May 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28477047/relative-importance-of-colonist-quantity-quality-and-arrival-frequency-to-the-extinction-of-two-zooplankton-species
#8
James S Sinclair, Shelley E Arnott
Colonist quantity, quality, and arrival frequency can all individually drive the dynamics and extinction of new populations. However, we do not understand which has the strongest influence, nor the circumstances under which their relative importance may change. We conducted a field mesocosm experiment that manipulated colonist quantity, quality, and arrival frequency in two zooplankton species (Daphnia pulicaria and Skistodiaptomus oregonensis). Individuals of each species were cultured under either high or low food concentrations to produce, respectively, 'good' and 'poor' quality colonists...
May 5, 2017: Oecologia
https://www.readbyqxmd.com/read/28474259/toxic-potential-of-the-emerging-contaminant-nicotine-to-the-aquatic-ecosystem
#9
Ana Lourdes Oropesa Jiménez, António Miguel Floro, Patrícia Palma
Nicotine is a "life-style compound" widely consumed by human populations and, consequently, often found in surface waters. This fact presents a concern for possible effects in the aquatic ecosystems. The objective of this study was to assess the potential lethal and sublethal toxicity of nicotine in aquatic organisms from different trophic levels (Vibrio fischeri, Pseudokirchneriella subcapitata, Thamnocephalus platyurus, and Daphnia magna). The bioassays were performed by exposing the organisms to concentrations of nicotine in a range of 0...
May 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28473696/microcosm-experimental-evidence-that-habitat-orientation-affects-phytoplankton-zooplankton-dynamics
#10
Yunshu Zhang, Ying Pan, Hanxiang Chen, Zhuomiao Hu, Shucun Sun
Although spatial ecology has achieved a great success in the passing decades, the importance of habitat orientation has not been well studied, especially for its effects on prey-predator dynamics. Here, we examined the responses of zooplankton activity and grazing rate to habitat orientation and their consequences on the stability of phytoplankton-zooplankton system in a two-factor factorial experiment involving habitat orientation (three levels; small, medium, and large base area, respectively) and habitat size (64 ml and 512 ml) using two algal-grazer systems (Chlorella pyrenoidosa-Daphnia magna and C...
May 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28471045/electrochemical-motion-tracking-of-microorganisms-using-a-large-scale-integration-based-amperometric-device
#11
Kosuke Ino, Yusuke Kanno, Kumi Y Inoue, Atsushi Suda, Ryota Kunikata, Masahki Matsudaira, Hitoshi Shiku, Tomokazu Matsue
Motion tracking of microorganisms is useful to investigate the effects of chemical or physical stimulation on their biological functions. Herein, we describe a novel electrochemical imaging method for motion tracking of microorganisms using a large-scale integration (LSI)-based amperometric device. The device consists of 400 electrochemical sensors with a pitch of 250 μm. A convection flow caused by the motion of microorganisms supplies redox species to the sensors and increases their electrochemical responses...
May 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28470932/simoni-smart-integrated-monitoring-as-a-novel-bioanalytical-strategy-for-water-quality-assessment-part-ii-field-feasibility-survey
#12
Ron VAN DER Oost, Giulia Sileno, Theo Janse, Mai Thao Nguyen, Harrie Besselink, Abraham Brouwer
Since it is impossible to chemically analyze all relevant micropollutants, the implementation of bioanalytical tools is essential to estimate ecological risks of chemical mixtures in regular water monitoring programs. The first tier of the Smart Integrated Monitoring (SIMONI) strategy, which was described in part I, is based on the combination of passive sampling and bioanalytical measurements. Bioassay responses are compared to effect-based trigger values (EBT) and an overall SIMONI score on all bioassay data was designed to indicate environmental risks...
May 4, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28454009/environmental-risk-assessment-of-effluents-as-a-whole-emerging-contaminant-efficiency-of-alternative-tertiary-treatments-for-wastewater-depuration
#13
B Díaz-Garduño, M G Pintado-Herrera, M Biel-Maeso, J J Rueda-Márquez, P A Lara-Martín, J A Perales, M A Manzano, C Garrido-Pérez, M L Martín-Díaz
Emerging contaminants (ECs) and regulated compounds (RCs) from three different WWTP effluents were measured in the current study. The efficiency of two tertiary treatments, Photobiotreatment (PhtBio) and Multi-Barrier Treatment (MBT), for removing contaminants was determined. Results indicated different percentages of removal depending on the treatment and the origin of the effluent. Risk Quotients (RQs) were determined for different species of algae, Daphnia, and fish. RQ results revealed diverse risk values depending on the bioindicator species...
April 10, 2017: Water Research
https://www.readbyqxmd.com/read/28452073/analyzing-the-capacity-of-the-daphnia-magna-and-pseudokirchneriella-subcapitata-bioavailability-models-to-predict-chronic-zinc-toxicity-at-high-ph-and-low-ca-concentrations-and-formulation-of-a-generalized-bioavailability-model-gbam-for-d-magna
#14
Tina Van Regenmortel, Olivier Berteloot, Colin R Janssen, Karel A C De Schamphelaere
Risk assessment in the European Union implements Zn bioavailability models to derive predicted no effect concentrations (PNEC) for Zn. These models are validated within certain 'boundaries', i.e. pH≤8 and Ca concentrations ≥ 5mg/L, but a substantial fraction of the European surface waters falls outside these boundaries. Therefore, we evaluated if the chronic Zn Biotic Ligand Model (BLM) for Daphnia magna and the chronic bioavailability model for Pseudokirchneriella subcapitata, can be extrapolated to pH above 8 and Ca concentrations below 5mg/L...
April 27, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28451857/assessing-the-environmental-hazard-of-individual-and-combined-pharmaceuticals-acute-and-chronic-toxicity-of-fluoxetine-and-propranolol-in-the-crustacean-daphnia-magna
#15
Valentina Varano, Elena Fabbri, Andrea Pasteris
Pharmaceuticals are widespread emerging contaminants and, like all pollutants, are present in combination with others in the ecosystems. The aim of the present work was to evaluate the toxic response of the crustacean Daphnia magna exposed to individual and combined pharmaceuticals. Fluoxetine, a selective serotonin re-uptake inhibitor widely prescribed as antidepressant, and propranolol, a non-selective β-adrenergic receptor-blocking agent used to treat hypertension, were tested. Several experimental trials of an acute immobilization test and a chronic reproduction test were performed...
April 27, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28451312/development-of-a-novel-lysosome-targetable-time-gated-luminescence-probe-for-ratiometric-and-luminescence-lifetime-detection-of-nitric-oxide-in-vivo
#16
Zhichao Dai, Lu Tian, Bo Song, Xiangli Liu, Jingli Yuan
Rapid, multiplexed, sensitive and specific identification and quantitative detection of nitric oxide (NO) are in great demand in biomedical science. Herein, a novel multifunctional probe based on the intramolecular LRET (luminescence resonance energy transfer) strategy, TRP-NO, was designed for the highly sensitive and selective ratiometric and luminescence lifetime detection of lysosomal NO. Before reaction with NO, the emission of the rhodamine moiety in TRP-NO is switched off, which prevents the LRET process, so that the probe emits only the long-lived Tb(3+) luminescence...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28437728/is-a-a-o-process-effective-in-toxicity-removal-case-study-with-coking-wastewater
#17
Liu Shi, Dong Wang, Di Cao, Chunhong Na, Xie Quan, Ying Zhang
The anaerobic-anoxic-oxic (A/A/O) process is the commonly used biological wastewater treatment process, especially for the coking wastewater. However, limit is known about its ability in bio-toxicity removal from wastewater. In this study, we evaluated the performance of A/A/O process in bio-toxicity removal from the coking wastewater, using two test species (i.e. crustacean (Daphnia magna) and zebra fish (Danio rerio)) in respect of acute toxicity, oxidative damage and genotoxicity. Our results showed that the acute toxicity of raw influent was reduced gradually along with A/A/O process and the effluent presented no acute toxicity to Daphnia magna (D...
August 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28436678/nanotoxicity-modelling-and-removal-efficiencies-of-znonp-with-consortium
#18
Şeyda Fikirdeşici Ergen, Esra Üçüncü Tunca
In this paper the aim is to model the toxic effect of zinc oxide nanoparticles (ZnONP) and is to analyze the removal of ZnONP in aqueous medium by the consortium consisted of Daphnia magna and Lemna minor. Three separate test groups are formed: L. minor (L), D. magna (D) and L.minor+D.magna (L+D) and all these test groups are exposed to three different nanoparticle concentrations (0.3;3.0 and 30.0 mg L(-)(1)). Time-dependent, concentration-dependent and group-dependent removal efficiencies are statistically compared by non-parametric Mann-Whitney U test and statistically significant differences are observed...
April 24, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28436057/the-effect-of-ph-on-chronic-zn-toxicity-differs-between-daphnid-species-development-of-a-preliminary-chronic-zn-ceriodaphnia-dubia-bioavailability-model
#19
Charlotte Nys, Colin R Janssen, Karel A C De Schamphelaere
In the present study, we observed that the chronic Zn Daphnia magna biotic ligand model (BLM) could not accurately predict the chronic Zn toxicity to Ceriodaphnia dubia in a series of (modified) field waters, although the intrinsic sensitivities of the D. magna BLM was specifically calibrated on the sensitivity of C. dubia. Moreover, it was observed that the D. magna BLM underestimated the effect of pH on toxicity of the free Zn(2+) ion. A preliminary species-specific chronic Zn C. dubia bioavailability model was developed based on the data...
April 24, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28435254/daphnia-magna-and-xenopus-laevis-as-in-vivo-models-to-probe-toxicity-and-uptake-of-quantum-dots-functionalized-with-gh625
#20
Emilia Galdiero, Annarita Falanga, Antonietta Siciliano, Valeria Maselli, Marco Guida, Rosa Carotenuto, Margherita Tussellino, Lucia Lombardi, Giovanna Benvenuto, Stefania Galdiero
The use of quantum dots (QDs) for nanomedicine is hampered by their potential toxicologic effects and difficulties with delivery into the cell interior. We accomplished an in vivo study exploiting Daphnia magna and Xenopus laevis to evaluate both toxicity and uptake of QDs coated with the membranotropic peptide gH625 derived from the glycoprotein H of herpes simplex virus and widely used for drug delivery studies. We evaluated and compared the effects of QDs and gH625-QDs on the survival, uptake, induction of several responsive pathways and genotoxicity in D...
2017: International Journal of Nanomedicine
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