scholarly journals Acute toxicity of benzotriazole ultraviolet stabilizers on freshwater crustacean (Daphnia pulex)

2011 ◽  
Vol 36 (2) ◽  
pp. 247-251 ◽  
Author(s):  
Joon-Woo Kim ◽  
Kwang-Hyeon Chang ◽  
Tomohiko Isobe ◽  
Shinsuke Tanabe
Keyword(s):  
Acute Toxicity ◽  
Daphnia Pulex ◽  
Freshwater Crustacean

scholarly journals Acute toxicity of pharmaceutical and personal care products on freshwater crustacean (Thamnocephalus platyurus) and fish (Oryzias latipes)

2009 ◽  
Vol 34 (2) ◽  
pp. 227-232 ◽  
Author(s):  
Joon-Woo Kim ◽  
Hiroshi Ishibashi ◽  
Ryoko Yamauchi ◽  
Nobuhiro Ichikawa ◽  
Yuji Takao ◽  
...  
Keyword(s):  
Acute Toxicity ◽  
Personal Care Products ◽  
Oryzias Latipes ◽  
Personal Care ◽  
Thamnocephalus Platyurus ◽  
Freshwater Crustacean

scholarly journals Estimating seven coefficients of pairwise relatedness using population genomic data

2016 ◽  
Author(s):  
Matthew S Ackerman ◽  
Parul Johri ◽  
Ken Spitze ◽  
Sen Xu ◽  
Thomas Doak ◽  
...  
Keyword(s):  
Numerical Optimization ◽  
Daphnia Pulex ◽  
Correlation Coefficients ◽  
Genomic Data ◽  
Optimization Procedure ◽  
Genotypic Correlation ◽  
New Methods ◽  
Population Genomic ◽  
Identical By Descent ◽  
Freshwater Crustacean

ABSTRACTPopulation structure can be described by genotypic correlation coefficients between groups of individuals, the most basic of which are the pair-wise relatedness coefficients between any two individuals. There are nine pair-wise relatedness coefficients in the most general model, and we show that these can be reduced to seven coefficients for biallelic loci. Although all nine coefficients can be estimated from pedigrees, six coefficients have been beyond empirical reach. We provide a numerical optimization procedure that estimates them from population-genomic data. Simulations show that the procedure is nearly unbiased, even at 3× coverage, and errors in five of the seven coefficients are statistically uncorrelated. The remaining two coefficients have a negative correlation of errors, but their sum provides an unbiased assessment of the overall correlation of heterozygosity between two individuals. Application of these new methods to four populations of the freshwater crustacean Daphnia pulex reveal the occurrence of half-siblings in our samples, as well as a number of identical individuals that are likely obligately asexual clone-mates. Statistically significant negative estimates of these pair-wise relatedness coefficients, including inbreeding coefficents that were typically negative, underscore the difficulties that arise when interpreting genotypic correlations as estimations of the probability that alleles are identical by descent.

Microbiological Detoxificaion of Resin Acids

1986 ◽  
Vol 21 (1) ◽  
pp. 119-129 ◽  
Author(s):  
James A. Servizi ◽  
Dennis W. Martens ◽  
Robert W. Gordon ◽  
James P. Kutney ◽  
Mahatam Singh ◽  
...  
Keyword(s):  
Acute Toxicity ◽  
Daphnia Pulex ◽  
Pulp Mill ◽  
Initial Step ◽  
Resin Acids ◽  
Ring Cleavage ◽  
Mortierella Isabellina ◽  
Fold Reduction ◽  
Pulp Mill Effluents ◽  
Chlorine Removal

Abstract The fungus, Mortierella isabellina, was used to define the biochemical transformations required to detoxify three resin acids and three chlorinated resin acids commonly found in pulp mill effluents. Detoxification was based on bioassays using Daphnia pulex and, whenever feasible, sockeye fry (Oncorhynchus nerka). Hydroxylation at C(2a) generally was the initial step in detoxification and usually resulted in at least a ten-fold reduction in acute toxicity. Additional hydroxylation further reduced acute toxicity. Ring cleavage was not required to detoxify the resin acids or their chlorinated derivatives. Furthermore, substantial reductions in acute toxicities of chlorinated compounds were achieved without chlorine removal.

ACUTE TOXICITY OF ARSENIC TO DAPHNIA PULEX: INFLUENCE OF ORGANIC FUNCTIONAL GROUPS AND OXIDATION STATE

2007 ◽  
Vol 26 (7) ◽  
pp. 1532 ◽  
Author(s):  
Joseph R. Shaw ◽  
Stephen P. Glaholt ◽  
Noah S. Greenberg ◽  
Reyes Sierra-Alvarez ◽  
Carol L. Folt
Keyword(s):  
Acute Toxicity ◽  
Functional Groups ◽  
Oxidation State ◽  
Daphnia Pulex ◽  
Organic Functional Groups

scholarly journals Pulsed light reduces the toxicity of the algal toxin okadaic acid to freshwater crustacean Daphnia pulex

2017 ◽  
Vol 25 (1) ◽  
pp. 607-614 ◽  
Author(s):  
Iain M. T. Murray ◽  
Neil J. Rowan ◽  
Sara McNamee ◽  
Katrina Campbell ◽  
Andrew M. Fogarty
Keyword(s):  
Okadaic Acid ◽  
Daphnia Pulex ◽  
Pulsed Light ◽  
Freshwater Crustacean ◽  
Algal Toxin

scholarly journals Evaluation of toxicity from leachate lagoons sediments, using the toxicity leaching procedure - TCLP and acute toxicity tests

DYNA ◽  
2019 ◽  
Vol 86 (208) ◽  
pp. 192-198
Author(s):  
Patricia Torres Lozada ◽  
Yazmin Carabalí Rivera ◽  
Luz Edith Barba Ho
Keyword(s):  
Acute Toxicity ◽  
Poecilia Reticulata ◽  
Daphnia Pulex ◽  
Acid Soils ◽  
Biological Indicators ◽  
Toxicity Tests ◽  
Municipal Solid Wastes ◽  
Inorganic Matter ◽  
Acute Toxicity Tests ◽  
Agricultural Use

Landfills have been the most used alternative for final municipal solid wastes disposal, however, this system is the responsible of contamination problems associated with the generation of leachates, sediments and toxic gasses emissions. The sediments occur by the organic and inorganic matter precipitation from leachates dumped in retention lagoons, which can present toxic characteristics than affect the environment. The aim of this work was to evaluate the potential toxicity of leachates from a municipal landfill, using the TCLP procedure and acute toxicity assays with Daphnia pulex and Poecilia reticulata as biological indicators. The results showed that the sediment evaluated, did not exceed the stablished levels suggested by the EPA for the TCLP test, nor were they toxic to the organisms used. This results, suggests a potential agricultural use of this material in acid soils, since the nature of leachate sediments are pH alkaline and rich in nutrients and organic matter.

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