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- W2143504164 abstract "Abstract Japanese medaka ( Oryzias latipes ) eggs were exposed to aqueous concentrations of six polychlorinated n ‐alkane (PCA) standards (C 10 H 155 Cl 65 , C 10 H 153 Cl 67 , C 11 H 184 Cl 56 , C 12 H 195 Cl 65 , C 14 H 24,9 Cl 5.1 , and C 14 H 23, 3 Cl 67 ) of known carbon chain length and chlorine content to assess their toxicity. Eggs were also exposed to 2,3,7,8‐tetrachlorodibenzo‐ p ‐dioxin (TCDD) to act as a positive control. Chlorinated paraffins are complex industrial products for which there is a lack of toxicological data on individual congeners. High aqueous concentrations of C 10 H 155 Cl 65 and C 10 H 15,3 Cl 6,7 (9,600 and 7,700 ng/ml, respectively) caused 100% mortality in eggs, but no other significant mortalities or lesions were observed at lower concentrations or in any eggs exposed to the other PCAs. Larvae from eggs exposed to high concentrations of the C 10 ‐, C 11 ‐ and C 12 ‐PCAs were extremely lethargic or did not move, although a heart beat was present. The concentrations in these exposures and the tissue concentrations of the larvae were at levels that should elicit narcosis. Concentrations of the C 14 ‐PCAs in larvae did not reach narcotic levels, and larvae in these exposures appeared normal with no signs of narcosis. The TCDD was found to be extremely embryotoxic, consistent with past work using Japanese medaka eggs. The ratio of LC50 of TCDD to the LC50 of the PCAs, based on acute toxicity and TCDD results, were all <0.0001, and most were <0.000001. These results suggest that the acute mechanism of toxicity of lower chlorinated, short (C 10‐13 ) and medium (C 14‐18 ) carbon chain PCAs is narcosis and that chlorine substitution on the terminal carbons of PCAs does not significantly increase nor decrease the toxicity of C 10 ‐ and C 14 ‐PCAs. However, additional work is needed to assess a greater range of PCAs as well as their sublethal effects and chronic toxicity." @default.
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- W2143504164 title "Toxicity of C10<sup>−</sup>, C11<sup>−</sup>, C12<sup>−</sup>, and C14<sup>−</sup>Polychlorinated alkanes to Japanese medaka (<i>Oryzias latipes</i>) embryos" @default.
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- W2143504164 doi "https://doi.org/10.1002/etc.5620181234" @default.
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