Dissolved free amino acids DFAA

Concentrations, turnover, and uptake of free amino acids probably have been examined more extensively than any other DOM component. For several decades it has been possible to measure turnover of dissolved free amino acids (DFAA) from the uptake of 14C- or3H-labeled amino acids (e.g., Azam and Holm-Hansen, 1973). Equally important was the development... 

Glu 6, a major constituent of dissolved free amino acids (DFAA) in marine sediments [71], has been detected in red algae (Rhodophyta) [72] and as a potential osmolyte in several marine bacteria, for example obligatory aerobic heterotrophs [70] and methanogenic archaebacteria [8], N-methyl-/ -glutamate has been reported solely as a natural product from the cyanobacterium Prochloron didemni [96]. 

Figure 8.5 Experimental fluxes of NELt-1-, NO3U dissolved organic nitrogen (DON), urea, dissolved free amino acids (DFAA), and dissolved combined amino acids (DCAA) across the sediment-water interface in cores collected in Hog Island Bay (USA). (Modified from Tyler et al., 2003.)...

Table 7.1 Summary of selected nitrogen (NOj", NO2, NH +, urea, dissolved free amino acids [DFAA], DON) uptake rates from the major ocean basins, and upwelling, coastal and estuarine systems using tracer techniques. Rates were converted to common units (nmol N L" using data provided in the original publication or using conversion factors specified in the footnotes... 

I, dissolved free amino acids [DFAA], peptides) uptake rates... 

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