Lumbriculus variegatus article 18 nonhuman 18 Animals 16 Oligochaeta 16 annelid worm 16 Invertebrata 14 controlled study 14 Animalia 12 Biomphalaria glabrata 12 Gastropoda 12 animal tissue 12 enzyme activity 12 Oligochaeta (Metazoa) 10 annelid 10 gastropod 10 Biomphalaria 8 Fresh Water 8 Water Pollutants, Chemical 8 bioavailability 8 invertebrate 8 priority journal 8 Cholinesterases 6 Particle Size 6 animal experiment 6 bioaccumulation 6 cholinesterase 6 concentration (composition) 6 enzyme inhibition 6 freshwater environment 6