The effect of isathrine 10 EC, a pyrethroid insecticide, on Paramecium primaurelia. Preliminary report
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Dilutions of Isathrine 10 EC containing in 100 cm3 of water up to 1.25 mg of bioresmethrin were toxic to paramecia, causing 100% mortality immediately or within a few seconds of treatment. In a dilution containing 0.625 mg% of bioresmethrin the mean number of surviving paramecia was 8 after 24 hours' treatment. Lower concentrations posed no threat to paramecia.
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