. The Biological bulletin. Biology; Zoology; Marine biology. Time (h) Figure 7. Time-course of '^NOs- incorporation as (A) NaOH-treated fraction and (B) unassimilated '^NHs by pieces of excised gill (1992 col- lection, same individual as Fig. 4). Pool Dives 3539 and 3541 and GC 272 (ANOVA; P ). NAD(P)H-dependent glutamate dehydrogenase (GDH) activity was detected in laboratory-maintained aposym- biotic mussels. NADH-dependent GDH activity in gill tissue was 10 times higher than NADPH-dependent ac- tivity. Activity was negligible in the absence of added ADP. NADH-dependent activity in the p
. The Biological bulletin. Biology; Zoology; Marine biology. Time (h) Figure 7. Time-course of '^NOs- incorporation as (A) NaOH-treated fraction and (B) unassimilated '^NHs by pieces of excised gill (1992 col- lection, same individual as Fig. 4). Pool Dives 3539 and 3541 and GC 272 (ANOVA; P ). NAD(P)H-dependent glutamate dehydrogenase (GDH) activity was detected in laboratory-maintained aposym- biotic mussels. NADH-dependent GDH activity in gill tissue was 10 times higher than NADPH-dependent ac- tivity. Activity was negligible in the absence of added ADP. NADH-dependent activity in the presence of ADP was higher in gill tissue ( ± ^mol mg protein"' h"' (SD, n = 7)) than in mantle tissue (, ^tmol mg protein"' h"'). NADH- and NADPH-dependent GDH activity (with ADP present) was not detected in freshly collected seep mytilids or in symbiotic mussels maintained in the laboratory. Discussion Symbiotic associations can be dominant organisms in nutrient-poor tropical waters as well as in nutrient-rich sites around deep-sea vents and cold seeps. This success results in part from the ability to utilize inorganic nitrogen from the environment and recycle ammonium produced by host metabolism. However, the mechanisms involved in inorganic N uptake and assimilation by symbiotic as-. External ^^NO^" (mM) Figure 8. Internal '^NHs concentration as a function of external '^NOs-. Same experiment as Fig. 2. Open circles = excised gills (1992 collection); filled circles = excised gills (1992 collection), negligible as- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woo
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