Uptake and XXXX of @entity71508 in aquatic organisms.

@entity137 @entity7866 @entity428 @entity71508 @entity3494 @entity3392
The @entity3494 species @entity71508 has been described as a contaminant of surface waters of anthropogenic origin. Here, we undertake to identify the most sensitive biological receptor among several sentinel aquatic species used in eco-toxicological assessment and to understand @entity137 in terms of internal dose. Therefore, a screening of short-term effects using different aquatic organisms (bacterium @entity7866 , fish @entity3392 , crustacean Daphnia magna and green alga Desmodesmus subspicatus and Scenedesmus vacuolatus) was conducted. For most organisms tested, effects were not detectable even at very high @entity71508 concentrations (up to 9.6mM) and thus the ecotoxic potential was found to be low in comparison to other @entity3494 compounds. The only organisms showing a clear response were the unicellular green alga, e.g. S. vacuolatus with an EC(50) value of 1.12 mM (84 mg L(-1) As). A linear relationship between ambient and internal concentration was found for this organism with a slope of 1.63 x 10(-3). Therefore, the internal concentration which shows a significant effect, e.g. 20% of inhibition of reproduction, was found to occur at a relatively low internal dose of 0.98 microM. Moreover, no biotransformation products inside the algae could be detected using @entity3494 speciation analysis with @entity428 , thus biological effects must be attributed to the untransformed compound. We conclude that the very low uptake observed for @entity71508 may be interpreted as preventive against toxic effects for the organisms.
