Abstract
A mathematical model was developed to describe the influence ofcultivation conditions on the growth and formation of macromolecularproducts of the red alga Porphyridium purpureum. Severalmacroscopic regulation mechanisms were shown to influence productformation.The growth and formation of pigments and polysaccharides and the releaseof polysaccharides were studied in different photobioreactors under batchand continuous cultivation conditions. The light intensity tested rangedfrom the compensation point to conditions nearly saturating for growth.Temperature, gas and the medium were kept constant during theexperiments in the photobioreactors, but were varied in supplementaryexperiments in shaken flasks.A non-linear relationship was found between the biomass concentrationand the polysaccharides excreted to the medium. Light intensity did notinfluence polysaccharide formation directly, but was the main externalfactor influencing pigment composition. These two factors are consideredin a structural model of functional macromolecules to give a properdescription of the product regulation. Based on the experimental results amodel is proposed that describes the formation of functionalmacromolecules in this alga.
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