1887

Abstract

SUMMARY

An examination was made of soluble extracellular materials produced by and some other species of blue-green algae, to exasmine whether they have any functional importance. Organisms of all the 15 species (representing 10 genera) examined produced extracellular pigment; with at least 10 of these species part of this pigment was not dif-fusible on dialysis, though the actual amount varied from 14 to 50%. The dialysis residue fractions of the extracellular products of . and 4 other species had similar amino acid compositions, rather different from those of extracellular polypeptides produced by other micro-organisms. The algal polypeptides had large proportions of serine and glycine, but no basic amino acids. The dialysis residue fraction of . extracellular product had no effect on spore formation and did not cause an increase in uptake of phosphate. A biological effect of this fraction was the decrease in the toxic effect of polymyxin B against . . For the latter organism there was a linear relationship between concentra-tion of polymyxin B and amount of algal dialysis residue fraction which just permitted the alga to survive. This effect of extracellular products on polymyxin B toxicity might operate in nature since often occurs in association with blue-green algae.

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1965-07-01
2024-12-02
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