By Richard J. Geider, Bruce A. Osborne (auth.)

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This increase can be measured by adding 15NH4 to a sample and following the accumulation of 15N label in low-molecular-weight (hot ethanol extract) and macromolecular (hot ethanol insoluble) pools (Kanda and Hattori, 1988). Using this approach, Kanda et al. (1988) found both nitrogen-sufficient and nitrogen-deficient phytoplankton populations in oligotrophic waters of the western North Pacific near Japan. An extreme case of the uncoupling of photosynthesis and growth has been observed in Laminaria solidungula from the high Arctic (Chapman and Lindley, 1980; Dunton, 1985).

A known amount of inorganic 14C-bicarbonate is introduced in trace amounts into a bottle containing a water sample. The sample is incubated for a specific period of time, which usually ranges between 1 hr and 1 d. At the end of the incubation, the inorganic 14C is separated from the organic 14c. , 1972). Acidification and purging of inorganic 14C should be carried out in the vial that will be used for scintillation counting to avoid loss of organic 14C (Theod6rsson and Bjarnason, 1975). 06 (dimensionless), dpmorg is the 14C activity in organic matter (in disintegrations per minute), dpm tot is the total inorganic 14C activity added to the sample, [TC021is the total inorganic carbon concentration, and 8t is the duration of the incubation.

1. Coupling of photosynthetic carbon reduction cycle (PCRC) and tricarboxylic acid cycle (TCA) illustrating major routes of CO 2 and HCO; incorporation by algae. Inorganic CO2 is fixed primarily by carboxylation of ribulose bisphosphate (RuBP) to form glycerrate 3-P. Phosphoglyceric acid (PGA) can be used to regenerate RuBP, diverted from the PCRC to synthesize storage carbohydrates and/or diverted from the PCRC to form phosphoenol pyruvate (PEP). Inorganic HCO;is fixed primarily by ,a-carboxylation of PEP to form oxaloacetate (OAA) which enters the TCA cycle, or serves as a precursor for the synthesis of aspartate and related amino acids.

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