Biomonitoring Articles

65 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 ...

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 ...

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 ...

Laboratory algal bioassays using PAM fluorometry: Effects of test conditions on the determination of herbicide and field sample toxicity

by John Wiley & Sons, Ltd.  (Jan. 29, 2014)

Pulse Amplitude Modulation (PAM) fluorometry, based on chlorophyll a fluorescence, is a frequently used technique in algal bioassays to assess toxicity of single compounds or complex field samples. It is known that several test conditions can influence the test results and since a standardized test protocol is currently lacking, it is difficult ...

Time‐dependent relative potency factors (REPs) for polycyclic aromatic hydrocarbons and their derivatives in the H4IIE‐luc bioassay

by John Wiley & Sons, Ltd.  (Jan. 10, 2014)

The H4IIE‐luc transactivation bioassay for aryl hydrocarbon receptor (AhR) agonists was used to investigate relative potency factors (REPs) of 22 individual polycyclic aromatic hydrocarbons (PAHs) and their oxygenated‐, methylated‐ and N‐containing derivatives (azaarenes), which are often present in PAH‐contaminated soils. Naphthacene and ...

Using Hexagenia in sediment bioassays: Methods, applicability and relative sensitivity

by John Wiley & Sons, Ltd.  (Dec. 25, 2013)

The majority of sediment toxicity and aquatic bioaccumulation assessments are conducted using standardized species, such as Hyalella azteca, Chironomus dilutus, and Lumbriculus variegatus. The burrowing mayfly, Hexagenia sp., may serve as an ideal supplemental organism for both toxicity and bioaccumulation studies for several reasons. Hexagenia ...

Development of exobiopolymer-based biosensor for detection of phosphate in water

by IWA Publishing  (Dec. 19, 2013)

The present study was conducted to develop a biosensor by exploiting phosphate-binding capacity of exobiopolymer (EBP) produced by Acinetobacter sp. An environmental isolate of EBP-producing Acinetobacter sp. was subjected to transposon (Tn5) mutagenesis to overproduce EBP and afford improved phosphate selectivity. A mutant producing the highest ...

Acute toxicity of the cationic surfactant C12‐benzalkonium in different bioassays: How test design affects bioavailability and effect concentrations

by John Wiley & Sons, Ltd.  (Nov. 23, 2013)

Using an ion‐exchange based solid phase micro‐extraction (SPME) method, the freely dissolved concentrations of C12‐benzalkonium were measured in different toxicity assays, including i) immobilization of Daphnia magna in the presence/absence of dissolved humic acid; ii) mortality of Lumbriculus variegatus in the presence/absence of a suspension ...

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