| 10831338 |
Mora BR, Martinez-Tabche L, Sanchez-Hidalgo E, Hernandez GC, Ruiz MC, Murrieta FF: Relationship between toxicokinetics of carbaryl and effect on acetylcholinesterase activity in Pomacea patula snail. Ecotoxicol Environ Saf. 2000 Jun;46(2):234-9.
The 96-h LC (50) value of carbaryl was 14.6 microg/mL for the snail Pomacea patula. Organisms were exposed for 72 h to a low sublethal concentration (0.1 of LC (50)) using a semistatic contamination system; bioconcentration and elimination experiments were performed evaluating simultaneously acetylcholinesterase (ACHase) activity. The inhibition of the digestive gland ACHase reached 76% when the carbaryl concentration in tissue was 3.2 microg/g. The increased enzyme inhibition was observed concomitantly with the bioconcentration of carbaryl until 7 h. ACHase inhibition was linearly dependent on the uptake and bioconcentration of carbaryl (r (2)=0.87). The transfer of snails to carbaryl-free water after 72 h of exposure was followed by rapid monophasic elimination with a half-life of 1.0 h. However, ACHase activity levels never returned to control values. These results revealed that the bioconcentration might play a critical role in contributing to the toxicity of carbaryl. |
7(0,0,1,2) |