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EXTRUSION OF CARBON ACCOMPANYING UPTAKE OF AMINO ACIDS BY MARINE PHYTOPLANKTERS 1
Author(s) -
Stephens Grover C.,
North Barbara B.
Publication year - 1971
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1971.16.5.0752
Subject(s) - amino acid , nitrogen , carbon fibers , incubation , chemistry , phytoplankton , environmental chemistry , carbon 14 , dissolved organic carbon , biochemistry , nutrient , botany , biology , organic chemistry , materials science , physics , quantum mechanics , composite number , composite material
Simultaneous measurements of cell nitrogen, dissolved 14 C, and dissolved amino nitrogen indicate that ambient amino acids enter phytoplankton cells, the amino nitrogen is retained, and some carbon is returned to the medium. This implies that radiochemical measurements of uptake rates using 14 C‐labeled amino acids may produce serious underestimates of actual uptake rates, particularly with long incubation times. Also, it is consistent with the hypothesis that amino acids may be a significant nitrogen source for phytoplankters in the ocean.