Shen etal. [11] studied the
influence of nitrogen source(urea,yeast extract,and nitrate)on lipid
productivity of heterotrophically cultivated Chlorella protothecoides.
It was observed that the lipid yield in microalgae varied from a
hundred to several hundred milligrams per liter per day according to
the difference of the nitrogen source,and the highest yield( 654 mg/L/
day)was gave with nitrate.