EFFECTS OF PHENOLS ON ALGAL CELLS FROM GREEN ALGAE SCENEDESMUS OBLIQUUS (TURP.) KUETZING.
ZENG ZHAO-QI AND CHEN ZI-AO (Department of Biology,Department of Chemistry,Nanjing University)
120 chemicals have been testedon Scenedesmus obliquus (Turp.) Kuet-zing for thier toxicity by adding theminto the media of algae culture,thirtyof these chemicals are phenol com-pounds.Experiments have shown thatsalicylaldehyde,dichlorophene and fiveamines are very effective algicides.Small amounts of salicylaldehyde (50ppm) or dichlorophene (50 ppm) in-hibited the development of the algae.The algal cells changed their colorfrom green to white while being cultured in the media with either of thetwo chemicals (see Fig.1 and Fig.2). The photographs taken with transmission electron microscope and scanning electron microscope have indicated that both chemicals are very toxicto the cells.The chloroplasts weredamaged by salicylaldehyde,espe-cially thylakoids were disintegrated. In other photographs it was shownthat the nucleus appeared to be difficult to identify,starch grains diffused out to fill up the cell and the inter-nal membrane system of the cell organwere broken.