Abstract
Particulate nitrogen (PN), particulate carbon (PC), chlorophyll a, and cell numbers were measured in nitrate and ammonium limited chemostat cultures of Scenedesmus abundans. With increasing growth rate, PN : PC increased but PN : cell did not vary. Variations in PN : PC are interpreted as reflections of relative rates of nitrogen and carbon assimilation. Net particulate carbon production was a positive linear function of growth rate. Eighty percent of the increase in net carbon production with increasing growth rate was attributable to synthesis of nitrogenous compounds, while production of nonnitrogenous compounds remained nearly constant.
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