title: A bioassay of toxicity using protozoa in the study of aquatic environment pollution and its prevention.
mesh_terms: D000085:Acetates / Q000633:toxicity; D000818:Animals; D001681:Biological Assay; D002254:Carbonates / Q000633:toxicity; D007501:Iron / Q000633:toxicity; D007854:Lead / Q000633:toxicity; D008278:Magnesium Sulfate / Q000633:toxicity; D009566:Nitrates / Q000633:toxicity; D010247:Paramecium / Q000187:drug effects; D011188:Potassium / Q000633:toxicity; D000644:Quaternary Ammonium Compounds / Q000633:toxicity; D012965:Sodium Chloride / Q000633:toxicity; D013997:Time Factors; D014876:Water Pollution / Q000032:analysis*
chemical_list: D000085:Acetates; D002254:Carbonates; D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D007854:Lead; D012965:Sodium Chloride; D008278:Magnesium Sulfate; D007501:Iron; D011188:Potassium