title: Storage and handling as sources of error in measuring fish acetylcholinesterase activity.
mesh_terms: D000110:Acetylcholinesterase / Q000032:analysis*; D000818:Animals; D001921:Brain / Q000201:enzymology; D005399:Fishes / Q000378:metabolism*; D005615:Freezing; D010278:Parathion / Q000633:toxicity; D012034:Refrigeration; D013045:Species Specificity; D013048:Specimen Handling; D013997:Time Factors
chemical_list: D010278:Parathion; D000110:Acetylcholinesterase