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Title: GDH activity and ammonium excretion during growth in the marine mysid, "Leptomysis lingvura"
Authors: Fernández-Urruzola, Igor 
Packard, Theodore T. 
Gómez, May 
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Glutamate dehydrogenase
Ammonium excretion
Leptomysis lingvura
Body Size
Issue Date: 2010
Abstract: Ammonium (NH4+) and nitrate (NO3-) are the main constituents of the inorganic nitrogen pool that supports primary production in marine systems. NH4+ release via glutamate deamination in heterotrophic organisms represents the largest recycled nitrogen source in the euphotic zone, supporting around the 80 % of the primary producers requirements (Harrison, 1992). Glutamate dehydrogenase (GDH) is the enzyme that catalyzes this process. This fact has lead to the use of GDH activity as an index, a proxy, for physiological NH4+ formation. The result is a measure of potential excretion that avoids incubation artefacts due to manipulation of the organisms. The relationship between GDH activity and NH4+ excretion in cultures of the marine mysid Leptomysis lingvura is analyzed here. With interspecific and environmental interferences minimized, the study shows that the relationship between GDH activity and NH4+ excretion in L. lingvura is similar to equivalent results measured on mixed assemblages of zooplankton.
Source: SIEBM. XVI Simposio Ibérico de Estudios de Biología Marina. Alicante (España), 6-10 Septiembre 2010.
Appears in Collections:Póster de congreso
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