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The two investigated algae had almost identical sterol composition, but there were signifi­cant differences in the com position of the polar components and especially in the composi­tion of the volatiles. P. denudata f. fragilis extracts possessed a stronger biological activity (antibacterial, antifungal and toxicity against Artemia salina). Despite the minute morpholog­ical differences between the two algae, we recommend P. denudata f. fragilis to be regarded as P. denudata subsp. fragilis.

zeitschrift für naturforschung c

Chemical Composition and Biological Activities of the Black Sea Algae Polysiphonia denudata (Dillw.) Kutz. and Polysiphonia denudata f. fragilis (Sperk) Woronich