The gel to liquid-crystalline phase transition of dipalmitoyl phosphatidylcholine (DPPC) vesicles was monitored with a lightscattering technique in the presence and absence of herbicides. The phase transition temperature for pure DPPC was determined as 41.6°C. 2-Methoxy-3,6-dichlorobenzoic acid (dicamba), 2-methoxy-3,6-dichlorophenylacetic acid (methoxy fenac), 2,4,5-T, (2,4,5-trichlorophenoxy)...