Abstract

IT has been shown that the blue-green alga Tolypothrix tenuis can be grown heterotrophically in complete darkness if, as well as mineral nutrients, appropriate organic substances such as casamino-acid are supplied as sources of nitrogen and carbon1. The maximum values for the growth rate and final growth yield obtained in heterotrophic conditions, however, were found to be far less than those attained in the usual autotrophic cultures.

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