self-purification (by 2 people)

algae (by 1 person)

aquatic ecosystems (by 1 person)

assessment (by 1 person)

bacteria (by 1 person)

bioassay (by 1 person)

biology (by 1 person)

biosphere (by 1 person)

biotest (by 1 person)

bivalves (by 1 person)

chemicals (by 1 person)

cyanobacteria (by 1 person)

detergents (by 1 person)

ecology (by 1 person)

ecotoxicology (by 1 person)

environmental (by 1 person)

environmental science (by 1 person)

environmental toxicology (by 1 person)

filter-feeders (by 1 person)

filtration activity (by 1 person)

flagellates (by 1 person)

freshwater (by 1 person)

hazard (by 1 person)

hazard assessment (by 1 person)

higher plants (by 1 person)

innovations (by 1 person)

invertebrates (by 1 person)

leeches (by 1 person)

marine (by 1 person)

marine organisms (by 1 person)

mollusks (by 1 person)

mussels (by 1 person)

new concepts (by 1 person)

new methods (by 1 person)

oysters (by 1 person)

pesticides (by 1 person)

phytotest (by 1 person)

phytotoxicity (by 1 person)

plant seedlings (by 1 person)

pollutants (by 1 person)

pollution (by 1 person)

surfactants (by 1 person)

testing (by 1 person)

toxicity (by 1 person)

toxicology (by 1 person)

university research (by 1 person)

water (by 1 person)

water quality (by 1 person)

water self-purification (by 1 person)

xenobiotics (by 1 person)