Occurrence of Nitrogen

The proposed scheme, in addition to neglecting the possible transient occurrence of nitrogen-oxygen compounds, does not include N, O, and H as reaction intermediates, an assumption which may constitute a reasonable approximation at relatively low temperatures. 

A short account of the origin of the different fossil hydrocarbons is necessary to understand the occurrence of nitrogen compounds and their nature. 

Nitrogen and Phosphorus 24-13 Occurrence of Nitrogen 24-14 Hydrogen Compounds of Nitrogen... 

Vignoles M, Bonel G, Young RA (1987) Occurrence of nitrogenous species in precipitated B-type carbonated hydroxyapatites. Calcif Tissue Inti 40 64-70... 

Of equal interest is the occurrence of nitrogen compounds in gases produced by coal combustion. These compounds, the oxides, originate from the organically bound nitrogen in the coal ... 

Single occurrence of nitrogen in more than one ring Chelate... 

The occurrence of nitrogenous compounds, particularly in cells in mature parts of the tree, may represent physical, chemical, and biological changes over the life cycle. For dead woody cells that compose the vascular system, the nitrogenous extractives may reflect the recent past history of the cells and the enzymes that have survived cellular differentiation. Labile enzymes are present in the secondary walls of differentiated reaction wood. Peroxidase, which is a universally stable enzyme in cell walls, cannot be detected histochemically in walls of dead cells (120). 

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