1 0
12
14
ooys
FIG. 1. The variation in ammonium and nitrate ion concontrations and tho production of
chlorophyll a and nitrate reductase (NR) during the growth of Cnchoaina niei in the
deep-tank cultures studied by Strickland el al. (1969) and Epploy el al. (1969a). See
text for full description. The unit of nitrate reductase activity wm that which
formed lo-* moles NO;/pg chlorophyll a/hour. (After Eppley el ul. 1969a.)