Nitrogen amino acids

Transamination channels a-amino acid nitrogen into glutamate. L-Glutamate dehydrogenase (GDH) occupies a central position in nitrogen metabolism. 

Partisil SCX Sulphonate Amino acids, nitrogenous bases... 

The chemical structures of the amino acids found in soil-solids are shown in Fig. 6 [25] while the quantities of amino acids found in HS extracted from various solid phases are represented in Fig. 7 (data were collected from Ghosh and Schnitzer [37] and Schnitzer et al. [38]). High levels of amino acid nitrogen were found in HA, FA, and humin fractions, indicating incorporation of common acidic and some neutral amino acids, particularly glycine, alanine, and valine. 

General catabolic process Amino acid Nitrogen end product... 

Shul pin and coworkers have demonstrated, in several papers, that other peroxo vanadium complexes closely related to 36, containing in the coordination sphere amino acids, nitrogen-containing bases or weak carboxylic acids, are effective oxidants of satnrated and aromatic hydrocarbons. An accnrate account containing this work, together with results related to the use of other transition metals, has appeared and aU the relevant literature can be found there. 

Although ammonia is constantly produced in the tissues, it is present at very low levels in blood. This is due both to the rapid removal of blood ammonia by the liver, and the fact that many tissues, particularly muscle, release amino acid nitrogen in the form of glulamhe or alanine, rather than as free ammonia (see Figure 19.13). 

A common biological determination is for amino-acid nitrogen. This determination is made by the van Slyke method, in which the amino groups (-NH2) in protein material react with HN02 to produce N ga< volume of which is measured. A 0.530 g sample of a biological material containing glycine,... 

The high reactivity of di- and trinitrophenyl fluorides towards nucleophiles has been used for the arylation of various N-nucleophiles. A method was developed for the determination of N-terminal amino acids in peptides. Thus, nucleophilic attack of the amino acid nitrogen at Sanger s reagent (2,4-dinitrophenyl fluoride, 4), hydrolysis and subsequent analysis of the N-(2,4-dinitrophenyl)amino acid allows determination of the amino acid.162,163 Although this method has been replaced by more efficient procedures, it marked a milestone in the elucidation of peptide structures (Nobel Prize 1958). A variety of N-nuclcophilcs (no amino acids) which have been used in the nucleophilic substitution of 2,4-dinitrophcnyl fluoride is listed. 

R.S. Potter and R.S. Snyder, Amino acid nitrogen of soils and the chemical groups of amino acids in the hydrolyzed soil and their humic acids, J. Am. Chem. Soc. 37 (1915) 2219-2224. 

Milne, P. J., and R. G. Zita. 1993. Amino acid nitrogen in atmospheric aerosols Occurrence, sources and photochemical modification. Journal of Atmospheric Chemistry 16 361-398. 

Cll. Childs, B., Urinary excretion of free alpha-amino acid nitrogen by normal infants and children. Proc. Soc. Exptl. Biol. Med. 81, 225-226 (1952). 

Nitrogen An element that occupies 78% of our atmosphere. It is a part of all living tissues and amino acids. Nitrogenous formulations are used as fertilizer. 

Pirc, H. (1985) Growth dynamics in Posidonia oceanica (L.) Delile. I. Seasonal changes of soluble carbohydrates, starch, free amino acids, nitrogen and organic anions in different parts of the plant. Publ. Staz. Zool. Napoli I Mar. Ecol. 6, 141-165. 

Note that the second nitrogen atom of urea originates from the amino group of aspartate. Cytosolic amino acid nitrogen is the source of aspartate nitrogen, as shown in Equation (20.18) through (20.20) ... 

Table 20.9 Amino Acids as Precursors of Various Nitrogenous Substances Amino acid Nitrogenous substance Function...

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