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Phytoplankton (both natural populations and cultures) have been concentrated 20-fold to 200-fold by passage through an ultrafiltration cell with continuous magnetic stirring. Conditions yielding maximum recovery of physiologically active phytoplankton have been developed. Recovery of 14C-carbon dioxide assimilation activity was comparable to that of chlorophyll, generally varying from 55-75% for natural populations and from 70-95% for cultures.
Limnology and Oceanography