The effect of parathion on the synthesis of protein and nucleic acid in Phaeodactylum tricornutum was studied with isotope tracing methods.The results showed that the low levels of parathion (≤1 5mg/L) could stimulate the growth of Phaeodactytum tricornutum, while high concentrations of parathion (≥2.0mg/L) could inhibited its growth.The synthesis of protein and nucleic acid was active during the process of stimulation,their synthesis rate increased.On the contrary,the synthesis of protein and nuc...