The effect of peptone on the growth of heterotrophic cultures of Chlorella vulgaris (Emerson strain).

Peptone is more effective than nitrate as a nitrogen source for heterotrophic cultures of Chlorella vulgaris (Emerson strain). It allows the production of an increased amount of algal material and supports an enhanced rate of cell division. Peptone-supplied heterotrophic cultures have a significantly higher content of protein and of soluble nitrogenous substances. The relation between these observations and the growth behaviour of this strain is referred to.