Seaweeds of diffcrcnt spccics werc collcctcd and tested for thcir antibiotic propcrtics. Exccpt during thc autumn and thc winter cxtracts of some algal spccics werc found to contain active substances that inhibit the growth of some moulds isolatcd from leather materials, It was shown that this active part was not destroyed by boiling in eUier undcr refiux, inactivatcd by acids and bases, but was found to be more stable when dry, The active part is most probably a phcnolic compound associated with halogcns.

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The results of this survey indicate that Vitamins B 12 and B$ are of iinportance for the growth and development of Ulva fasciata plants. Accordingly the growth rate of these plants is greatly dependent on the amount of both Vitamins present in the outer medium. Vitamin B 6 promoted growth and nitrogen metabolism rather than Vitamin B12 at the same concentration.In general the effect of both Vitamins on fat and sugar synthesis was not elaborate.

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The present paper aims to formulate a byproduct-supplemented medium suitable for the production of large amounts of protein rich Dunaliella salina biomass. Components of the MH basal growth medium were examined for partial replacement by cheese whey, beet molasses, and yeast fermentation liquor. Maximum growth rate was achieved after 8 days of incubation in the presence of 0.4% fermentation liquor that replaced ¾ of the weight of all medium components other than NaCl. Interestingly, the presence of fermentation liquor or cheese whey resulted in more than 1.5 and1.4-fold increases, respectively, in algal protein production. By application of three sequential multi-factorial experimental designs, medium composition was further optimized with respect to protein content in Dunaliella cultures. Among medium components, fermentation liquor was the most significant factor that affected the response. Compared to the basal condition, the optimized medium formula resulted in approximately a 1.7-fold increase in the protein content of Dunaliella salina cultures.