Organic nitrogen storage

We could not find other areas of primary metabolism in which QA might play a part. Since we can assume that all metabolites found in organisms have a definite function (19), we suggest that the nitrogen storage function of QA is of only minor importance and probably not sufficient to explain the complex physiology of QA. 

Storage. Certain proteins serve as a reservoir of essential nutrients. For example, ovalbumin in bird eggs and casein in mammalian milk are rich sources of organic nitrogen during development. Plant proteins such as zein perform a similar role in germinating seed. 

The Nitrogen Economy Aspects of Amino Acid Synthesis and Degradation Metabolic Consequences of the Absence of Nitrogen Storage Compounds Biosynthetic Capacities of Organisms (Table 20,1)... 

Nitrogen is usually the limiting nutrient in wetlands. Organic nitrogen is the major storage pool in wetlands. 

This analytical approach is problematic. The measurement of DON requires the collection of the samples in duplicate. One sample is used for the analysis of the ambient concentrations of NO3, NO2, and NH4, which is usually carried out within a short time after the sampling. The second sample is used for the analysis of the TDN content after the step of oxidation. Any difference and variability in the filtration and storage procedures of the samples and in the analytical mefliods may result in errors on the determination of DON and TON. Moreover, the accuracy and precision of the result will depend by the efficiency of the oxidation of the organic nitrogen pool in the water samples, by the absence of nitrogen losses or contaminations during the analysis, and by the imcertainties on the analytical determinations. 

If liquid nitrogen storage is used, stringent precautions must be taken in packaging samples. The vial closures routinely used in organic chemistry laboratories do not... 

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