ALGAL INHIBITION BY YELLOW ULTRAVIOLET-ABSORBING SUBSTANCES FROM FUCUS VESICULOSUS

摘要: The yellow extracellular phenolic substances produced by Fucus vesiculosus were found to be toxic all unicellular algae examined. Concentrations which completely inhibited growth varied from approximately 25 μg/ml for Monochrysis lutheri more than 150 μg/ml Porphyridium sp. toxicity appeared result cellular lysis rather a deficiency of trace metals or vitamins. After fractionation on charcoal column, only the ethanolic eluate was markedly toxic. 100 μg/ml aqueous caused almost no inhibition Monochrysis. factor largely destroyed autoclaving. It could passed through an ultrafilter 24A pore size, and active both in acidic alkaline media. is suggested that this excretory product may have ecological significance.