Abstract
Abstract 1. 1. A strong correlation (r2 = 0.916) was found between glutamate dehydrogenase (GDH) activity and ammonium excretion in Praunus flexuosus suggesting a key regulatory role for this enzyme. 2. 2. The high level of GDH activity found in this mysid was sufficient to account for all the ammonium excreted. 3. 3. Activator-inhibitor studies imply that GDH may regulate energy production and growth, in addition to ammonium excretion. 4. 4. The GDH assay presented here appears useful as a technique for quantifying zooplankton ammonium excretion impacts in the world oceans.
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