Biomonitoring Articles

224 Results found
  • Category: Monitoring & Testing ×

  • Subcategory: Biomonitoring ×

Methylated phenanthrenes are more potent than phenanthrene in a bioassay of human aryl hydrocarbon receptor (AhR) signaling

by John Wiley & Sons, Ltd.  (Jul. 16, 2014)

Alkylated polycyclic aromatic hydrocarbons (APAHs) are abundant in petroleum but data regarding their toxicological properties are limited. A survey of all monomethylated phenanthrene structures revealed that they were 2‐5 times more potent than phenanthrene for activation of human aryl hydrocarbon receptor in a yeast bioassay. Phenanthrenes ...

Lead toxicity to Lemna minor predicted using a metal speciation chemistry approach

by John Wiley & Sons, Ltd.  (Jul. 16, 2014)

In the present study, predictive measures for Pb toxicity and L. minor were developed from bioassays with 7 surface waters having varied chemistries (i.e., 0.5 to 12.5 mg/L dissolved organic carbon (DOC), pH 5.4 to 8.3 and water hardness 8 to 266 mg/L CaCO3). As expected based on water quality, 10, 20 and 50% inhibitory concentration (IC) ...

Root length of aquatic plant, Lemna minor L., as an optimal toxicity endpoint for bio‐monitoring of mining effluents

by John Wiley & Sons, Ltd.  (Jul. 7, 2014)

Lemna minor, a free‐floating macrophyte, is used for bio‐monitoring of mine effluent quality under the Metal Mining Effluent Regulations (MMER) of the Environmental Effects Monitoring (EEM) program in Canada, and is known to be sensitive to trace metals commonly discharged in mine effluents such as nickel. Environment Canada's standard toxicity ...

Integrated assessment of runoff from livestock farming operations: Analytical chemistry, in vitro bioassays, and in vivo fish exposures

by John Wiley & Sons, Ltd.  (May 16, 2014)

Animal waste from livestock farming operations (LFOs) can contain varying levels of natural and synthetic androgens and/or estrogens, which can contaminate surrounding waterways. In the present study, surface stream water was collected from six basins containing LFOs. Aqueous concentrations of 12 hormones were determined via chemical analyses. ...

Electrospun substituted polyphenylene vinylene nanofibres

by Inderscience Publishers  (Apr. 21, 2014)

Biosensors are a rapidly growing research field, which is being swiftly advanced due to recent advances in nanotechnology. However most of the sensors developed are solution based, which limits their commercial use. Thus, with the view of developing bio–nanosensors based on solid–state photoluminescent nanofibres the electrospinning process was ...

A computational approach predicting CYP450 metabolism and estrogenic activity of an endocrine disrupting compound (PCB‐30)

by John Wiley & Sons, Ltd.  (Mar. 31, 2014)

Endocrine disrupting chemicals (EDCs) influence growth and development through interactions with the hormone system, often through binding to hormone receptors such as the estrogen receptor. Computational methods can predict EDC activity of unmodified compounds, but approaches predicting activity following metabolism are lacking. This study ...

Species sensitivity and dependence on exposure conditions impacting the phototoxicity of TiO2 nanoparticles to benthic organisms

by John Wiley & Sons, Ltd.  (Mar. 21, 2014)

Toxicity of TiO2 nanoparticles (nano‐TiO2) to aquatic organisms can be greatly increased upon exposure to ultraviolet radiation (UV). This phenomenon has received some attention for water column species; however, investigations of nano‐TiO2 phototoxicity for benthic organisms are still limited. In this study, bioassays of 3 representative ...

Exploring ecotoxicological fish bioassay for the evaluation of uranium reprotoxicity

by John Wiley & Sons, Ltd.  (Mar. 21, 2014)

Although reproduction in fish is known to be sensitive to metal exposure, few ecotoxicological studies have focused on the toxicological effects of metals on reproduction in fish. Because uranium (U) is naturally present in aquatic ecosystems (0.6–2 mg/L), freshwater organisms are subjected to chronic U exposure. Although new standardised ...

Efficiency of peracetic acid in inactivating bacteria, viruses, and spores in water determined with ATP bioluminescence, quantitative PCR, and culture-based methods

by IWA Publishing  (Mar. 19, 2014)

The disinfection efficiency of peracetic acid (PAA) was investigated on three microbial types using three different methods (filtration-based ATP (adenosine-triphosphate) bioluminescence, quantitative polymerase chain reaction (qPCR), culture-based method). Fecal indicator bacteria (Enterococcus faecium), virus indicator (male-specific ...

Comparison of Microcystis aeruginosa (PCC7820 and PCC7806) growth and intracellular microcystins content determined by liquid chromatography–mass spectrometry, enzyme-linked immunosorbent assay anti-Adda and phosphatase bioassay

by IWA Publishing  (Mar. 19, 2014)

Cyanobacteria are able to produce several metabolites that have toxic effects on humans and animals. Among these cyanotoxins, the hepatotoxic microcystins (MC) occur frequently. The intracellular MC content produced by two strains of Microcystis aeruginosa, PCC7806 and PCC7820, and its production kinetics during the culture time were studied in ...

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